Large Public Buildings

(Introduction: mention that public buildings exist in all cities and towns, large and small, e. g. post office, court pause, places of worship, theater) A public building is a building that belongs in some way to the state. The number of public buildings in any town or village will depend on the size of that community and its needs. For example, you will usually find a town hall of some sort, a school and a place of worship at he least. In anger communities there will be a police station, law courts, a library and maybe a theater funded by he state. (Pros: city pride, beautiful to look at, useful/necessary buildings, create a city center. ) The desire to build impressive buildings is not new. The ancient cities of the Middle East and South America were designed with large public buildings to impress visitors and enemies and give a sense of pride. In modern times, outstanding public buildings still. reate a great sense of local and national pride. They are what gives a city its character and they form asocial center, a place where people like to meet. (Cons: waste of public money, intimidating, nationalistic. Give opinion on whether they stop us from building houses or whether they can be compatible. ) However, some people argue that governments have constructed unnecessary, and sometimes ugly, buildings simply to make themselves feel important. I tend to feel that such buildings may be a waste of public money but I am not sure we can claim that they prevent houses from being built, because these governments have often ensured that adequate housing was also available. Houses and public buildings can exist side by side. (Conclusion – sum up the two parts to the answer. Leave the reader thinking. ) The answer lies in finding ape right balance. We want o feel pride in our town, but we also want our citizens to have comfortable homes. It is hard to please everyone.

Purity of Aspirin by Spectrophotometry Essay

The mass of acetylsalicylic acid was determined using a analytical balance. Sodium hydroxide (NaOH) was added to the acetylsalicylic acid and heated in order to hydrolyze acetylsalicylic acid. Iron chloride was added to each volumetric flask as the purity of the aspirin can be tested by addition of Fe+3 to a suspension of the product. Phenols such as salicylic acid react with iron chloride to form coloured (violet) complexes Aspirin easily absorbs green light and green is the compliment of violet, which allows a determination of the amount of aspirin present. The percentage purity of aspirin was found to be 90. 62%. Aspirin tablets (about 5-grams) are usually compounded of about 0. 32 g of acetylsalicylic acid, which indicates that aspirin should be about 94% pure. The calculated value for aspirin content was close to the true value and indicates that aspirin sample tested was very pure. .Introduction Aspirin is a member of a family of chemicals called salicylates. This chemical can be converted (changed) by the body after it is eaten to another chemical, salicylic acid. Salicylic acid may be irritating because it is an acid; therefore one of the acidic parts was covered up with an acetyl group, converting it to acetylsalicylic acid (ASA). ASA not only could reduce fever and relieve pain and swelling, but better for the stomach and worked even better than salicylic acid. Salicylic acid produces a salicylate dianion, when dissolved in water, which reacts with an acidic solution Fe (NO3)3(aq), to produce a strong violet tetraaquosalicylatroiron (III) complex. The violet color of the complex results from the fact that the complex strongly absorbs green light. When this green is removed from normal white light, we observe violet (therefore, green is the compliment of violet). This absorption of green light can be used to quantitatively determine the amount of aspirin present in the solution. The more green light that is absorbed, the more violet the solution, and hence, the more salicylate is present. If green light is directed into a solution that contains this aspirin complex, some of the green light will be absorbed. The intensity of the green light leaving the sample, I, is less than the original intensity of the green light, I0. We can talk about the fraction of light that was transmitted through the sample, transmittance (T); or we can talk about the amount of light that was absorbed by the sample, absorbance (A). Transmittance is inversely proportional to absorbance: the more light that passes through the sample, the higher the transmittance and the lower the absorbance; conversely, the less light that passes through the sample, the lower the transmittance and the higher the absorbance. Several standard solutions of the salicylate complex are prepared. The absorbance of each standard solution is measured at the wavelength of maximum absorption of green light (530 nanometer) using a spectrophotometer. A graph of these absorbance values versus the concentration of each of the standards should yield a straight line. This relationship is known as Beers’ Law: A = a b c A is the absorbance of the solution, a, is the molar absorptivity (a constant for this complex), b is the path length of cuvette (in cm), and c is the molar concentration of the solution being measured. The absorbance of a solution is directly proportional to the concentration of that solution. Therefore, the molar concentration, c, of a solution can be determined by simply measuring the absorbance, A, of that solution. Since we are actually measuring the absorbance of the complex, the stoichiometry of the reaction producing the complex is 1:1. So, if we know the concentration of the complex, we know the concentration of the aspirin. The concentration, the amount of acetylsalicylic acid and purity of aspirin sample will be determined by using Beer’s Law plot. The concentration and absorbance of sodium salicylate will be found, thus being able to find the percentage purity of aspirin.

Dissolved Oxygen Essay

Oxygen in Liquids (DISSOLVED OXYGEN) Dissolved Oxygen – the amount of dissolved oxygen in a body of water as an indication of the degree of the health of water and its ability to support a balanced aquatic ecosystem. Oxygen – is a clear, colorless, odorless, and tasteless gas that dissolves in water. Small but important amounts of it are dissolved in water. OXYGEN: Aquatic Life Depends on it Plants and Animals depend on dissolved oxygen for survival. Lack of dissolved oxygen can cause aquatic animals to leave quickly they are or face death. Factors Affecting Oxygen Levels Temperature Rate of Photosynthesis Degree of Light Penetration (turbidity & water depth) Degree of Water Turbulence or Wave action The amount of oxygen used by respiration and decay of organic matter Oxygen in the Balance Dissolved Oxygen levels that are at 90% and 110% saturation level or higher consistently considered healthy or good. If the Dissolved Oxygen are below 90%, there may be large amounts of oxygen demanding materials. What Is Dissolved Oxygen In Water? Dissolved oxygen in water is vital for underwater life. It is what aquatic creatures need to breathe. Why Is Dissolved Oxygen Important? Just as we need air to breathe, aquatic organisms need dissolved oxygen to respire. It is necessary for the survival of fish, invertebrates, bacteria, and underwater plants. How Is Dissolved Oxygen Measured? Dissolved oxygen concentration can be reported as milligrams per liter, parts per million, or as percent air saturation. Polarographic Cell It is very similar to the galvanic cell. However, the polarographic cell has two noble-metal electrodes and requires a polarizing voltage to reduce the oxygen. The dissolved oxygen in the sample diffuses through the membrane into the electrolyte, which usually is an aqueous KC1 solution. If there is a constant polarizing voltage (usually 0.8 V) across the electrodes, the oxygen is reduced at the cathode, and the resulting current How is proportional to the oxygen content of the electrolyte. This current flow is detected as an indication of oxygen content. Galvanic Cell All galvanic cells consist of an electrolyte and two electrodes (Figure 8.43c). The oxygen content of the electrolyte is equalized with that of the sample. The reaction is spontaneous; no external voltage is applied. In this reaction, the cathode reduces the oxygen into hydroxide, thus releasing four electrons for each molecule of oxygen. These electrons cause a current flow through the electrolyte.. The magnitude of the current flow is in proportion to the oxygen concentration in the electrolyte. Flow through Cells In the flow-through cells, the process sample stream is bubbled through the electrolyte. The oxygen concentration of the electrolyte is therefore in equilibrium with the sample’s oxygen content, and the resulting ion current between the electrodes is representative of this concentration. These types of cells are usually provided with sampling consisting of (but not limited to) filtering and scrubbing components and flow, pressure, and temperature regulators. Thallium Cell Thallium cells are somewhat unique in their operating principle and cannot be classified into the category of either galvanic or polarographic cells. At the same time, they are of the electrochemical type. One thallium-electrode cell design is somewhat similar in appearance to the unit illustrated on Figure 8.43c except that it has no membrane or electrolyte. This cell has a thallium outer-ring electrode and an inner reference electrode. When oxygen contacts the thallium, the potential developed by the cell is a function of  the thallous ion concentration at the face of the electrode, and the ion concentration is in proportion to the concentration of dissolved oxygen. Fluorescence-based Sensor In this case, a compound containing ruthenium is immobilized in a gas-permeable matrix called a sol-gel. Sol-gels are very low-density, silica-based matrices suitable for immobilizing chemical compounds such as the ruthenium compound used in this measurement technique. Effectively, the sol-gel is equivalent to the membrane in a conventional DO sensor. Using fiber optics, light from a light-emitting diode is transferred to the backside of the sol-gel coating. The emitted fluorescence is collected from the backside of the sol-gel with another optical fiber and its intensity is detected by photodiode. A simplified sensor design is shown in Figure 8.43g. If no oxygen is present, the intensity of the emitted light will be at its maximum value. If oxygen is present, the fluorescence will be quenched, and the emitted intensity will decrease. Twinkler Titration The Winkler Method is a technique used to measure dissolved oxygen in freshwater systems. Dissolved oxygen is used as an indicator of the health of a water body, where higher dissolved oxygen concentrations are correlated with high productivity and little pollution. Temperature Effects Pressure Effects Salinity Effects Biochemical Oxygen Demand (BOD) Biological Oxygen Demand (BOD) is a measure of the oxygen used by microorganisms to decompose this waste. If there is a large quantity of organic waste in the water supply, there will also be a lot of bacteria present working to decompose this waste. In this case, the demand for oxygen will be high (due to all the bacteria) so the BOD level will be high. As the waste is consumed or dispersed through the water, BOD levels will begin to decline. Biochemical oxygen demand (BOD) is a measure for the quantity of oxygen required for the biodegradation of organic matter (carbonaceous demand) in water.It can also indicate the amount of oxygen used to oxidise reduced forms of nitrogen (nitrogenous demand), unless their oxidation is prevented by an inhibitor. A test is used to measure the amount of oxygen consumed by these organisms during a specified period of time (usually 5 days at 20 ÌŠÌŠÌŠÌŠC). Classification: BOD is devided in two parts which is Carbonaceous Oxygen Demand and the Nitrogenous Oxygen Demand. Carbonaceous Oxygen Demand – it is the amount of oxygen consumed by the microorganisms during decomposing carbohydrate material. Nitrogenous Oxygen Demand – it is the amount of oxygen consumed by the microorganisms during decomposing nitrogenous materials. Relationship of DO and BOD If the Dissolve Oxygen (DO) of a water is high, the Biological Oxygen Demand (BOD)is low. If the BOD of the water is hight, the DO is low.Therefore DO and BOD is inversely Proportional to each other. Why we should need to know BOD? BOD directly affects the amount of dissolved oxygen in rivers and streams. The greater the BOD, the more rapidly oxygen is depleted in the stream. This means less oxygen is available to higher forms of aquatic life. The consequences of high BOD are the same as those for low dissolved oxygen: aquatic organisms become stressed, suffocate, and die. Knowledge of oxygen utilization of a polluted water supply is important because: 1. It is the measure of the pollution load, relative to oxygen utilization by other life in the water; 2. It is the means for predicting progress of aerobic decomposition and the amount of self-purification taking place; 3. It is the measure of the oxygen demand load removal efficiency by different treatment process. Factors that contributes to variations in BOD The Seed Is the bacterial culture that affects the oxidation of materials in the sample. If the biological seed is not acclimated to the particular wastewater, erroneous results are frequently obtained. pH The BOD results are also greatly affected by the pH of the sample, especially if it is lower than 6.5 or higher than 8.3. In order to achieve uniform conditions, the sample should be buffered to a pH of about 7. Temperature Standard test condition calls for a temperature of 20 ÌŠC (68 ÌŠF). field tests often require operation at other temperatures and, consequently, the results tend to vary unless temperature corrections are applied. Toxicity The presence of toxic materials may result increase in the BOD value as a specific sample is dilluted for the BOD test.Consistent value may be obtained either by removing the toxic materials from the sample or By developing a seed that is compatible with the toxic material in the sample. Incubation Time The usual standard lab test incubation time is 5 days, results may occur at a flat part or occur at a steeply rising portion.Depending on the type of seed and the type of oxidable material, divergent result can be expected. Nitrification In the usual course BOD test, the oxygen consumption rises steeply at the beginning of the test owing to attack on carbohydrate materials. Another sharp increase in oxygen utilization occurs sometime during 10th to 15th day in those samples containing nitrogenous materials. How we determine or measure BOD? Five-Day BOD Procedure The BOD test takes 5 days to complete and is performed using a dissolved oxygen test kit. The BOD level is determined by comparing the DO level of a water sample taken immediately with the DO level of a water sample that has been incubated in a dark location for 5 days. The difference between the two DO levels represents the amount of oxygen required for the decomposition of any organic material in the sample and is a good approximation of the BOD level. Test procedures: 1. Take 2 samples of water 2. Record the DO level (ppm) of one immediately using the method described in the dissolved oxygen test. 3. Place the second water sample in an incubator in complete darkness at 20oC for 5days. If you don’t have an incubator, wrap the water sample bottle in aluminum foil or black electrical tape and store in a dark place at room temperature (20 ÌŠC or 68  °F). 4. After 5 days, take another dissolved oxygen reading (ppm) using the dissolved oxygen test kit. 5. Subtract the Day 5 reading from the Day 1 reading to determine the BOD level. Record your final BOD result in ppm. Note: Generally, when BOD levels are high, there is a decline in DO levels. This is because the demand for oxygen by the bacteria is high and they are taking that oxygen from the oxygen dissolved in the water. If there is no organic waste present in the water, there won’t be as many bacteria present to decompose it and thus the BOD will tend to be lower and the DO level will tend to be higher. At high BOD levels, organisms such as macro  invertebrates that are more tolerant of lower dissolved oxygen may appear and become numerous. Organisms that need higher oxygen levels) will NOT survive. Extended BOD Test Continuation of BOD test beyond 5 days shows a continuing oxygen demand, with a sharp increase in BOD rate at the 10th day owing to nitrification. The latter process involves biological attack on nitrogenous organic material accompanied by an increase in BOD rate. The oxygen demand continues at a uniform rate for an extended time. Manometric BOD Test In the manometric procedure, the seeded sample is confined in a closed system that includes an appreciable amount of air . As the oxygen in the water is depleted, it is replenish by the gas phase. A potassium hydroxide (KOH) absorber within the system removes any gaseous carbon dioxide generated by bacterial action. The oxygen removed from the air phase results in a drop in pressure that is that is removed with a manometer. This fall is then related to the BOD of the sample. Electrolysis System for BOD The measuring principle for all electrolytic respirometers is quite similar. As micro-organisms respire they use oxygen converting the organic carbon in the solution to CO2 gas, which is absorbed to alkali. This causes a reduction in the gas pressure, which can be sensed with various sensors or membranes. A small current is created in electrolysis cell and this generates oxidation/reduction reactions in the electrolysis cell and oxygen is formed at the anode. Electrolysis of water can supply oxygen to a closed system as incubation proceeds . At constant current, the time during which electrolysis generates the oxygen to keep the system pressure constant is a direct measure of the oxygen demand. The amount of oxygen produced by the electrolysis correlates with the amount of oxygen consumed by bacteria. Chemical Oxygen Demand (COD) Is the standard method for indirect measurements of the amount of pollution in a sample of water that cannot be oxidized biologically. Is based on the chemical decomposition of organic and inorganic contaminants, dissolved or suspended in water. Why Measure Chemical Oxygen Demand? It is often measured as a rapid indicator for organic pollutant in water. Normally measured in both municipal and industrial wastewater treatment plants and gives an indication of the efficiency of the treatment process. It is measured on both influent and effluent water. Standard Dichromate COD Procedure A sample is heated to its boiling point with known amounts of sulfuric acid and potassium dichromate. The loss of water is minimized by the reflux condenser. After 2 h, the solution is cooled, and the amount of dichromate that reacted with oxidizable material in the water sample is determined by titrating the excess potassium dichromate with ferrous sulfate. Dichromate consumed is calculated as to oxygen equivalent for the sample and stated as milligrams of oxygen per liter of sample (ml/l). Factors preventing the concordance of BOD values to COD values: Many organic materials are oxidizable by dichromate but not biochemically oxidizable, and vice versa. For example, pyridine, benzene, and ammonia are not attacked by the dichromate procedure. A number of inorganic substances such as sulfide, sulfites, thiosulfates, nitrites, and ferrous iron are oxidized by dichromate, creating an inorganic COD that is misleading when estimating the organic content of wastewater. Although the factor of seed acclimation will give erroneously low results on the BOD tests, COD results are not dependent on acclimation. Chlorides interfere with the COD analysis, and their effect must be minimized in order to obtain consistent results. The standard procedure provides for only a limited amount of chlorides in the sample. This is usually accomplished by diluting the sample to achieve a lower chloride concentration and interference. This can be a problem for low COD  concentration samples, as the dilution may dilute the COD concentration below the detection level or to levels at which accuracy and repeatability are poor. COD Detector The term COD usually refers to the laboratory dichromate oxidation procedure, although it has also been applied to other procedures that differ greatly from the dichromate method but which do involve chemical reaction. These methods have been embodied in instruments both for manual operation in the laboratory and for automatic operation online. They have the distinct advantage of reducing analysis time from days (5-day BOD) and hours (dichromate, respirometer) to minutes. Automatic On-Line Designs Takes a 5 cc sample from the flowing process stream. Injects it into the reflux chamber after mixing it together with dilution water (if any) agents. One ozone-based scheme enriches dilution water with and with two reagents: dichromate solution and sulfuric acid. The reagents also contain an oxidation catalyst (silver sulfate) and a chemical that complexes chlorides in the solution (mercuric sulfate). The mixture is boiled at 302 °F (150 °C) by the heater. Vapors are condensed by the cooling water in the reflux condenser. During which the dichromate ions are reduced to trivalent chromic ions, as the oxygen demanding organics are oxidized in the sample. The chromic ions give the solution a green color. The COD concentration is measured by detecting the amount of dichromate converted to chromic ions by measuring the intensity of the green color through a fiber-optic detector. The microprocessor-controlled package is available with automatic zeroing, calibration, and flushing features. Sampling and Traditional Parameter Parameter Limit Value Sampling: pH, Standard Units 6.0 – 9.0 Traditional Parameters: Biological Oxygen Demand (BOD) ≠¤ 30 ppm Chemical Oxygen Demand (COD) ≠¤ 200 ppm COD has a large value than BOD because BOD measurement is based only in decomposition of organic matter while COD measures the decomposition of both organic and Inorganic compound. Sources of Error Cause of using nonhomogeneous sample is the largest error. Use of volumetric flasks and volumetric pipettes with a large bore. Oxidizing agent must be precisely measured. Make sure that the vials are clean and free of air bubbles. Always read the bottom of the meniscus at eye level. Total Oxygen Demand (TOD) The quantitative measurement of the amount of oxygen used to burn the impurities in a liquid sample. Thus, it is a direct measure of the oxygen demand of the sample. Measurement is by continuous analysis of the concentration of oxygen in a combustion process gas effluent. A quantitative measurement of all oxidizable material in a sample water or wastewater as determined instrumentally by measuring the depletion of oxygen after high-temperature combustion. BOD and COD have long time cycles. COD use corrosive reagents with the inherent problem of disposal. Analysis is faster, approximately 3 min, and uses no liquid reagents in its analysis. Can be correlated to both COD and BOD. Unaffected by the presence of inorganic carbon. Also indicate noncarbonaceous materials that consume or contribute oxygen Since the actual measurement is oxygen consumption. Reflects the oxidation state of the chemical compound. TOD Analyzer The oxidizable components in a liquid sample introduce into the combustion tube are converted to their stable oxides by a reaction that disturbs the oxygen equilibrium in the carrier gas steam. The momentary depletion in the oxygen concentration in the carrier gas is detected by an oxygen detector and recorded as a negative oxygen peak. Sample Valves Sliding Plate Upon a signal from a cycle timer, the air actuator temporarily moves the valve to its â€Å"sample fill† position. At the same time, an air-operated actuator moves a 20-ul sample through the valve into the combustion tube. A stream of oxygen-enriched nitrogen carrier gas moves the slug of sample into the combustion tube. Rotary Sampling Valve A motor continuously rotates a sampling head, which contains a built-in sampling syringe. For part of the time, the tip of the syringe is over a trough that contains the flowing sample. 2 or more cam ramps along the rotational path cause the syringe plunger to rise and fall, thus rinsing the sample chamber. Just before the syringe reaches the combustion tube, it picks up a 20-ul sample. As it rotates over the combustion tube, it discharges the sample. Oxygen Detectors Platinum-lead Fuel Cell Fuel Cell – Generates a current in proportion to the oxygen content of the carrier gas passing through it. Before entering the cell, the gas is scrubbed in a potassium hydroxide solution, both to remove acid gases and other harmful combustion products to humidify the gas. The oxygen cell and the scrubber are located in a temperature-controlled compartment. The fuel cell output is monitored and zeroed to provide a constant baseline. The output peaks are linearly proportionate to the reduced concentration of oxygen in the carrier gas as a result of the sample’s TOD. Yttrium-doped Zirconium Oxide Ceramic Tube Coated on both sides with a porous layer of platinum. It is maintained at an elevated temperature and also provides an output that represents the reduction in oxygen concentration in the carrier gas that is a result of the sample’s TOD. The operation of these oxygen detectors involves the ionization of oxygen in both a sample and a known reference gas stream. When the sample and reference gas streams come in contact with the electrode surfaces, oxygen ionizes into O-2 ions. The oxygen ion concentrations in each stream is a function of the partial pressure of oxygen in the stream. The potential at each electrode will depend on the partial pressure of oxygen in the gas stream. The electrode with higher potential (higher oxygen concentration) will generate oxygen ions, whereas the electrode with lower potential (lower oxygen concentration) will convert oxygen ions to oxygen molecules. Calibration Analysis is by comparison of peak heights or areas to a standard calibration curve. To prepare this curve, known TOD concentrations of a primary standard (KHP) are prepared in distilled and deionized water. Standard solutions are stable for several weeks at room temperature. Water solutions of other organic compounds can also be used as standards. Several analyses can be made at each calibration concentration, and the resulting data are recorded as parts per million (ppm) TOD vs. peak height or area. Applications: Correlation: Many regulatory agencies recognize as the basis for oxygen-depleting pollution control only BOD or COD (preferably BOD) measurements of pollution load, because they are concerned with the pollution load on receiving waters, which is related to lowering the DO due to bacterial activity. If other methods described are to be used to satisfy legal requirements of pollution load in effluents or to measure BOD removal, it is important to establish a correlation between the other methods and BOD or COD (preferably BOD). Salient Features: a measurement of property of the sample, i.e. the amount of oxygen required for bacterial oxidation of bacterial food in the water, the BOD dependence of the oxygen demand on the nature of the food as well as on its quantity dependence of the oxygen demand on the nature and amount of the bacteria Another extensive study concluded the following: (1) A reliable statistical correlation between BOD and COD of a wastewater and its corresponding TOD can frequently be achieved, particularly when the organic strength is high and the diversity in dissolved organic constituents is low. (2) The relationship is best described by a least squares regression with the degree of fit expressed by the correlation coefficient (3) The observed correspondence of COD-TOD was better than that of COD-BOD for the wastewaters. (4) The BOD-COD ratio of an untreated wastewater is indicative of the biological treatment possible with the particular wastewater. Comparison: COMPARISON BOD COD TOD Definition The oxygen required when a population of bacteria causes the oxidation reaction in a population of bacteria. The oxygen equivalent when the oxidation is carried out with a chemical oxidizing reagent such as potassium dichromate. The oxygen equivalent when oxidation is caused by heating the sample in a furnace in the presence of a catalyst and oxygen. Analyzer Utilize bacteria to oxidize the pollutants Measured through chemical oxidation and catalytic combustion techniques Oxidize the sample in a catalyzed thermal combustion process and detect both the organic and inorganic impurities in a sample Response-Range 5 days – 30 mg/L 2 hours – 250-500 ppm 3 minutes – 100-100,000 mg/L Inaccuracy-Cost 3 – 20% / $500 – $20,000 2 – 10% / $8,00 – $20,000 2 – 5% / $5,000 – $20,000

Urban Planning and decision-making in Dubai Essay

Urban Planning and decision-making in Dubai - Essay Example n of this paper that the biggest concerns Dubai seems to have at this point are: 1) sustainability 2) cultural considerations 3) labor relations and 4) traffic. Sustainability is an issue that can best be judged from a future point. The cultural considerations are also elements that are being worked out in many ways. So labor and transport issues become the central themes of this paper. The biggest complaint to date is traffic problems. The planning of roads seems to have lost its way. This, in contrast to the other planning elements, seems a small problem but it is becoming more and more of an issue as Dubai becomes popular and established as an international city. What role does the public play in the decision-making process during the development of Dubai? To what extent did the government maintain a monopoly over these decisions? How active of a role did the private sector play in the urbanization of the city? How has globalization affected the decision-making process? A review of Leonie Sandercock’s â€Å"Toward Cosmopolis† shows that Sandercock writes about the cultural pluralism of planning theory in a way that is highly idealistic (Blanco 1998). She is said to discuss her social project in a political and economic vacuum, failing to address the underlying causes of the social problems. Cosmopolis is, for Sandercock, â€Å"a common civic culture which has embraced the social project of tolerance, alterity, and inclusion† (Blanco 1998). Sandercock states that there are three forces that create the major cultural politics of difference: migration and multiculturalism, postcolonialism, and the age of women and minorities. She believes that the history of planning has supported segregation and discrimination. These are major forces at work in Dubai’s planning. A perceived threat of marginalization (Aarts 1999) by less developed countries has often led to their full interaction with the world economy, before they may be ready. Aart feels that

COMPASSION FETIGUE and BURNED OUT Essay Example | Topics and Well Written Essays - 1000 words

COMPASSION FETIGUE and BURNED OUT - Essay Example Though under these conditions, the healthcare service providers may continue to provide their services however, their natural urge and tendency to provide the care as well as the compassion can decrease too. However, with right tools and techniques this could be averted and the caregivers can actually rehabilitate themselves to provide the same level of support and care to their patients. As a part of the renewal process, the caregivers can actually recharge their batteries and renew themselves to revive their hopes and provide the same level of compassion and care to their patients. In this paper, the nature and extent of the compassion fatigue will be discussed besides explaining the emotional, spiritual as well as physical needs of the caregivers besides discussing as to how the caregivers can actually cope with this. Compassion Fatigue Over the period of time, as the healthcare services providers cope with the system and become regular in treating and caring their customers, a te ndency starts to develop in them which can result into strong physical, spiritual as well as emotional burnout for them. ... The demands of managed care therefore are creating strong influences over the healthcare service providers to deliver a certain level of service to their patients and clients. However, as the interaction of the patients and healthcare givers increases, there emerges a tendency which can actually compromise the professional ability of the caregivers. (Jeffrey R. Funk, 2004) What is also important to note that the compassion fatigue often results into certain emotional, spiritual as well as physical symptoms which can further compromise the ability of the caregivers to provide proper care services. The emergence of feelings of hopelessness, negative attitude as well as feeling sick and tired may cause strong physical and emotional burnout for the caregivers. It is therefore critical that these needs of the caregivers are taken care of. Physical, Spiritual and Emotional Needs of the caregivers Caregiving can often become a 24 hrs job which can potentially sap the energy and will out of the caregivers. A typical caregiver spends most of his or her time to take care of the patients or dependents and resultantly develop symptoms which can be detrimental to his own health. One of the key physical symptoms of the compassion fatigue is the lack of sleep which can start to take its toll on the body of the caregiver. Sustained level of insomnia or sleeplessness therefore can result into significant physical health problems for the caregivers. It has been argued that the brain’s frontal lobe depends upon the adequate sleep and rest to perform effectively and in the absence of quality sleep, certain emotional responses or reactions could emerge too. (Endicott, 2011) It is

Elective and Reconstructive Surgeries Essay Example | Topics and Well Written Essays - 2000 words

Elective and Reconstructive Surgeries - Essay Example Plastic surgery began after World War I but became popular only in 2006 and 2007 not only in the United States of America but also in the whole world. South Korea has 74 procedures per 10,000 people and the United States only has 42 procedures per 10,000 people so South Korea has the highest rate of plastic surgery but the United States has the highest number at 1,300,000 plastic surgeries every year so it is more common in the United States to have plastic surgery (â€Å"It’s official,† 2012). Plastic surgery is actually a big part of American life. In the United States, there were 1.6 million cosmetic surgeries last year. According to American Society of Plastic Surgeons, there were 307,000 procedures for breast augmentation, 244,000 for nose reshaping, 205,000 for liposuction, 196,000 for eyelid surgery, and 119,000 for facelift. Eyelid surgery increased by 6% and eyelid surgery 5%. For reconstructive surgery, there were around 5 million cases last year. Tumor remova l was 4.2 million, laceration repair was 303,000, maxillofacial surgery was 195,000, scar revision was 175,000 and hand surgery was 120,000. Maxillofacial surgery was popular because it was up 125 percent from 2010. More reconstructive surgeries were done compared to elective surgeries so reconstructive surgeries remain popular in the United States. ... Reconstructive surgeries cost around $80,000 to $200,000 if you don’t have insurance, according to Yahoo Answers but this is brain surgery so it is naturally expensive (â€Å"How much would,† 2009). However, the cost of plastic surgery is really an issue in the United States. This research paper will find out if the cost of plastic surgery is really a big issue or not. Elective Surgeries According to the encyclopedia of surgery, an elective surgery is a â€Å"planned, non-emergency surgical procedure which is medically required or optional† (â€Å"Elective Surgery,† 2012). However, in this paper, elective surgeries mean cosmetic surgeries that are optional. The cost of cosmetic surgery in the United States is extremely expensive but it depends on the type of procedure. Liposuction for five areas costs around $10,000 but spider vein costs $200 (â€Å"Cost of Plastic Surgery,† 2011). Breast augmentation is around $3,500 to $12,000 (â€Å"I’m C oncerned,† 2012). Facelifts cost around $6,600 (â€Å"Cosmetic Surgeries,† 2011). However, even though cosmetic surgery is expensive, health insurance does not cover it (â€Å"Reconstructive Surgery,† 2012). The popularity of cosmetic surgery is still high even though insurance does not cover it. From 2010 to 2011, there is a 5% increase in elective cosmetic surgeries (â€Å"13.8 Million Cosmetic,† 2011). It is really popular because just in 2010, Americans spent $845 million only for facelifts (â€Å"Cosmetic Surgeries,† 2011). In 2011, the top American cities for elective cosmetic surgery are Miami, Atlanta, Dallas, San Francisco, Sacramento, Baltimore, Nashville, Louisville, Seattle, and Washington DC

The state and international community counterterrorism response to Essay

The state and international community counterterrorism response to [insert terrorist group] - Essay Example Thus, it is an international threat to both the foreign and local governments that wage war on terror. This factor forces the United States, alongside the international community, to take measures of executing counters to these acts of terror. The countries constitute legal establishments and law enforcement strategies to continue the fight against terrorism. Al-Qaeda is a militant Islamism organisation founded under the stewardship and overview of Osama bin Laden and Abdullah Yusuf Azzam in the town of Peshawar, based in Pakistan. Its established dates back to the Soviet War in Afghanistan, between august 1988 and late 1989, with is objective of formulation being to assist defeat the Russians (Chaliand & Blin, 2007, p. 67). Over the years, Al Qaeda grew, and today it boasts of the status of a fully pledged multinational army that is stateless. Subsequent to the Soviet War in Afghanistan, the group dispersed; nonetheless, it continued to present its displeasure and opposition to what the leaders of the group considered corrupt and foreign Islamic regimes such as the presence of United Sates in Islamic lands. During its formation, the group had a base in Sudan, but eventually resettled in Afghanistan in 1990, under the patronage of the Taliban militia. The Al Qaeda group merged and established partnerships with several other militant Isla mist organizations after its reestablishment that held views and practices similar to its visions (Gerges, 2009, p. 98). Such organizations that it merged with include the Islamic Jihad and the Islamic group of Egypt and the leaders of the group then declared holy war against the United Sates and her allies. After forming partnerships, the Al-Qaida started establishing its camps throughout the world, recruiting Muslim people into the group and training as well as equipping them with skills for fighting and carrying out the terror

Practice Problems for Elasticity Essay Example | Topics and Well Written Essays - 2500 words

Practice Problems for Elasticity - Essay Example Price elasticity is always negative for complements. Forth and last, income, a change in income causes a shift in demand. Income elasticity f demand is calculated as the percent change in demand divided by the percent change in income. This change determines the magnitude f the shift. Demand can increase or decrease with the increase or decrease in income. Along any straight-line demand curve, elasticity decreases from infinity to zero. In the range f the demand curve where elasticity is more than one, decreasing price increases revenue. In the rage where elasticity is less than one, however, decreasing price decreases revenue. My service selection is Pet Day Care and I have found it to price elastic...meaning that there are several substitutes. Low-end services like dog walking are good substitutes for drop-off pet day care centers. A fall in the price for someone to come to your home and let your dog out or walk or dog may likely decrease the demand for you take your pet to an "All-Day" daycare facility. The lower price f the "In-Home" service induces consumers to purchases these services versus those f a drop-off or "All-Day" facility. The cross-price elasticity f Pet Day Care with respect to drop-off or in-home service determines the magnitude f shift in the demand curve. Lowering the price f drop-off service would likely increase demand and revenue. Immediate substitutes or replacements f... Where as a walking service averages about $25 per week for 2 ten-minute daily walks Monday through Friday and in home services averaging $25 - $30 per day. Price adjustments have increased demand in the drop-off sector as having space resources readily available i.e. -warehouse space or open land have become increasingly available and by market standards, very cheap to acquire and maintain. This project was able to focus on the market structure f a Pet Day Care service. Each division represents a different market structure. I learned about perfect competition part day care, full day care, and in home pet day care. The changes depended on the type f pet care the pet owner went with. It was interesting to see how the changes and decisions that are made in the different types f care can affect the results f the prices and the cost/profits for the service. Microeconomics Price Elasticity f Demand 1.) If the price elasticity f demand for heroin is estimated to be about 0.4 this means that the demand is mostly inelastic because the elasticity demand is less than one. Being mostly inelastic means a percent change in price leads to a less than proportional percent change in quantity demanded. So if there is a 10% increase in price, it will lead to a 4% decrease in quantity demanded. 2.) If the price f heroin increases, given its inelastic demand, the suppliers' income will increase. This is proved to be true because mostly inelastic demand and total revenue are directly related. When the price is raised on heroin the percentage changed f quantity demanded is less than the percentage changed for the price in turn raising the total revenue f the heroin dealers. This policy has

Promote good sleep hygiene Essay Example | Topics and Well Written Essays - 750 words

Promote good sleep hygiene - Essay Example The National Sleep Foundation (2011) also lays down that inadequate sleep contributes to different problems related to depression. UMass Boston should keep all these problems in sight before implementing an educational program for the students regarding sleep hygiene. UMass Boston health office should ensure that the students are getting an excellent sleep before coming to the school. This would help in improving the academic performance of many of the students in the college. Frederick Danner and Brandon Phillips (2008) in â€Å"Adolescent sleep, school start times, and teen motor vehicle crashes† state that adolescents are not getting enough sleep as they are growing up and this leads to several problems in the society. Teenagers tend to drive while being drowsy and this leads to many traffic problems in the society. Keeping this in mind the UMass Boston health office can provide the students with the information about driving without sleep. Driving while being drowsy poses the risk of accidents to these teenagers and the health office should inform the students about the risks involved. Mary Carskadon in a research at Brown University found that students who got enough sleep in their daily routine were able to perform well in their academic settings. The research clearly showed that students who went to bed earlier in their daily routine were able to grasp A’s and B’s whereas the ones who slept less were amongst the low achievers in the class (Carpenter 2001).Moreover Kyla Wahlstrom (2002) stated that students who did not get enough sleep showed signs of inattentiveness and poor performance in the class. All these signs clearly show that the UMass Boston health office should take a step to inform the students about the possible consequences that they may face if they do not get enough sleep. Sleep is also related to the cognitive skills of an individual as shown by many researches. June Pilcher and Walter (1997) carried out an experiment to find out the relation between the cognitive skills and sleep. The experiment was conducted on 44 college students who either were sleep deprived for 24 hours or slept for 8 hours. These college students were asked to perform a cognitive skill test after which they had to complete 2 questionnaires with regard to the efforts that they made during the test. The result clearly showed that the individuals who did not get sleep properly were not able to perform well in their academic settings. The cognitive skills of the ones who slept properly were higher than the ones who did not sleep properly. The students who did not sleep properly were not able to perform at the cognitive task whereas those who slept well were completely different as they were able to perform well. Moreover the questionnaires helped to assess the awareness of the students and it was found that the sleep deprived students rated their performance to be high than the non-deprived ones which clearly means that they are not aware about the effects of sleep on their academics. Sleep education at UMass Boston can help the students to get over these common problems so that they can concentrate on their skills and improve upon their cognitive performance (Pilcher & Walter 1997). Maintaining Sleep hygiene is a solution to all the problems that individuals in academic settings suffer from. Sleep related problems are seen to be suffered by many students because of which they cannot perform well in th

Earth Science and Society Essay Example | Topics and Well Written Essays - 500 words

Earth Science and Society - Essay Example From this study it is clear that  geography has been based on physics and astronomy and has focused on both physical and human nature. The other scientific disciples mostly study living things in general. A good definition will entail the study of both non-living and living things on earth and also in space. The strength associated with geography is the ability of connecting all functioning interrelationship which are not usually noticed in simple defined schools of thought. The weakness with geography is that in most cases important facts on causes and effects are usually missed because of holistic understanding. The mentioned strength has made it possible to come up with theories which can be proved to be true, but the weakness has led to generalization of theories which are not necessarily true.According to the report  weather entails the events that happen on a daily basis in the atmosphere such as temperature, humidity and rainfall, and it varies from one environment to the other. Climate basically is the weather pattern of a particular wide area averaged over so many years. A town can experience the day’s weather to be wet, cold and rainy. The climate pattern of Antarctica is always rainy and stormy.  Greenhouse effect is the process by which the atmospheric airs consisting of water vapor, methane, nitrous oxide and carbon dioxide trap the heat from the sun and radiate it back to the surface of the earth.

To Kill a Mockingbird Essay Example for Free

To Kill a Mockingbird Essay Cultural values and social practices change and evolve over time. Cultural values and social practices inevitably over time as individuals and societies are subject to change with it. In the timeless bildungsroman novel, â€Å"To Kill A Mockingbird† (1960) written by Harper Lee, it explores the confronting experiences of a young child, living in a world of racism, injustice and disability. In a more modern context, however, the novel â€Å"The Family Law† (2009) written by Benjamin Law, is a hilarious memoir describing the quirky and â€Å"stranger-than-fiction† family circumstances that he and his family lived through. Both of these texts vividly describe their culture values and practices, and looking at it from a 21st century, modern perspective, we can see how much these morals and principles have changed. The novel, â€Å"To Kill A Mockingbird† is set in a town called Maycomb in Alabama in the 1930s and is a story about racism, injustice and empathy through the eyes of a young girl, Scout Finch. Scout is nearly six years old when the novel starts, and she lives with her brother Jem and her widowed father Atticus, who is a lawyer. In the novel, the Maycomb society is extremely rigid, conservative and unjust in terms of race and class. Any person who is black or is associated with blacks were looked down upon, and it is just assumed that â€Å"that all Negroes lie, that all Negroes are basically immoral beings, that all Negro men are not to be trusted. † The injustice towards black people is also shown through the Tom Robinson case. Even though there is sufficient and reliable proof that Robinson is innocent, he is still charged as guilty – simply because he is black. Those of lower class are also disregarded such as Arthur Radley. Arthur is a man in his 30s, but during his teenager years, he became wild and his father locked him in their house and has never been seen since. The children of Maycomb refer to Arthur as â€Å"Boo†, as if he were a ghost. They made up stories and terrible rumours about him, and he is constantly being degraded, even though he is innocent. This also brings us to the importance of the title of the novel: â€Å"to kill a mockingbird†. The significance of this title is seen through a key passage in the novel: â€Å"Atticus said to Jem†¦ â€Å"Shoot all the blue jays you want, if you can hit ‘em, but remember it’s a sin to kill a mockingbird. That was the only time I ever heard Atticus say it was a sin to do something, and I asked Miss Maudie about it. She said, Mockingbirds don’t do one thing except make music for us to enjoy. They don’t eat up people’s gardens, don’t nest in corn cribs, they don’t do one thing but sing their hearts out for us. That’s why it’s a sin to kill a mockingbird. † In the novel, Robinson, Boo Radley, Jem and Scout are the â€Å"mockingbirds†. The mockingbird represents anyone who is weak, innocent and defenceless, and to kill a mockingbird in that sense means to take advantage of someone who is weaker than you. Tom Robinson was exploited and was accused of rape, and even though everyone knew he did not do so, they still charged him guilty, because he was black. Boo can also be considered a mockingbird, as he is taunted and looked down upon, even though he is nothing like what people describe him to be. The community take advantage of his absence and vulnerability to make fun of him, although he has done nothing wrong. Finally, Jem and Scout are also referred to as â€Å"mockingbirds†, when Bob Ewell tries to take revenge on Atticus for making him look bad in front of Maycomb. He decides to attack his children, who have done completely nothing wrong. The children are innocent and naive, but they are the target because they are so weak and helpless. Without the intervention of Arthur, Bob would have easily killed the children and impact Atticus’ life greatly. Lee effectively uses analogies such as these to create a more confronting method to illustrate the inequality and injustice that people faced in history. For example, she uses an analogy of the Maycomb courthouse to describe how cultures are changing: â€Å"†¦the concrete pillars supporting its south roof were too heavy for their burden; they were all that remained standing when the original court house burned. Another court house was built around them, or is it better to say, built in spite of them†¦the Greek revival columns clashed with a big nineteenth century housing a rusty unreliable instrument, indicating a people determined to preserve every physical scrap of the past. † This passage demonstrate that the pillars were ancient – what they held before and what they are now are of the past as the world has changed; there is no point trying to support something that is not worth supporting. In this way, segregation is like this pillar – the people who are racist and segregate themselves from others are the pillar. They only uphold their own values, but these values are wrong and out-dated, and it is changing. Also, Lee adds irony to this analogy, as a courthouse is the place where everything is supposed to judge what is right and wrong – it is a place where everything should be fair and just, yet, so many bigoted and unfair things have happened there. â€Å"To Kill A Mockingbird† is also about empathy and heroism. The bravery that Atticus had to stand up for the blacks was considered incredulous and degraded for doing so. He knew that the jury was going to charge Tom guilty; yet he still fought and defended him just as he would defend any other innocent person. â€Å"Its when you know youre licked before you begin but you begin anyway and you see it through no matter what. † He teaches his children, especially Scout the important lesson about empathy. He says, â€Å"You never really understand a person until you consider things from his point of view Until you climb inside of his skin and walk around in it. † He explains that even though some things are wrong, you have to look at it from another person’s perspective and understand it from their point of view. In the novel, people’s views do change, and not everyone is racist. For example, Mr Dolphus married a black woman, but due to the disgust of the white community, he pretended to be a drunk so that he could â€Å"give them a reason folks can say Dolphus Raymond’s in the clutches of whisky – that’s why he can’t help himself and lives the way he does. † Change does happen slowly, and once again Lee uses metaphors and analogies to portray this. When the jury took longer than usual, Atticus says he thought there was â€Å"a shadow of a new beginning†, and he knows that wrong beliefs and values were starting to change. But most importantly, change can only come about through individuals first. This can be seen through the jail incident. When Mr Cunningham comes with a lynching mob, all it takes for him to realise his wrongs was when Scout talks to him. Scout was so innocent and unsure about what was happening, but it was this that made Mr Cunningham realise what he was doing was wrong and for him and his mob to go home. A mob is made of individuals, and each and every individual is capable of being nice people, because every individual has a heart. Atticus says to Scout at the end, â€Å"Most people are (real nice), Scout, when you finally see them†. The way Lee structure the book is also very significant. The two major victims of the novel, Tom Robinson and Boo Radley are merged at the end at an ultimate climax. The themes of racism and disability are therefore also combined. From all the events that happened in the novel, at the end, we can see that slowly, but surely, the values that the community and individuals holds are beginning to change. â€Å"The Family Law† is a memoir written by Benjamin Law about himself and his family. From the first chapter we can already see how much culture has changed between two generations. He begins by describing his father whose attitudes and values are much different than those of his children. He expresses his experiences with his father in a humorous and light tone, and uses lots of hyperboles and rhetorical questions to engage the reader in his tales. An important part of the chapter is the description of his father’s childhood. Law’s father had only seen his own father (Law’s grandfather) once in his whole life, as he moved to San Francisco to earn more money. When Law’s father turned 12, his father moved back to Hong Kong to see him, but within 30 minutes of seeing his son, he died. Law describes this moment: â€Å"Is it possible to describe what happened next without sounding like a liar? † From this chapter, we can already see how much culture has changed between 2 generations. Before, China was poor, but now it has become much more updated, innovative and modern. The fact that his grandfather had to go to America to earn money – this is usually uncommon as families nowadays are much more likely to stay together. Also, it is much easier to communicate nowadays with improving technology compared to previous years, where even electricity was scarce. In the first chapter of â€Å"The Family Law†, we can already see distinct cultural differences between the past and the present. Cultural and social values have definitely evolved over time – some changes may be slow and gradual such as racism or equality, and other perhaps quite fast such as technology and design. Either way, beliefs and values must change as over time, morals and customs evolve as well.

Descriptive Writing Essay Example for Free

Descriptive Writing Essay I could feel a gentle warm breeze that was blowing in from the west, bringing with it a mouth-watering smell of strawberry ice cream. Also with the wind came the enchanting smell of fresh salty air mixed with another smell that I didn’t recognise. The active bustling metropolitan was surrounded by rolling emerald green hills, giants watching over me. In the centre of the city sat a colossal thirty storey skyscraper made purely out of glass and reinforced steel. The city faced the never ending topaz sea: it stretched all the way up to a calm and pleasant lake which glittered over a mile away in the distance. The north section of the city was taken up by imposing skyscrapers and a humming metropolitan of lights and music; a huge building encrusted completely with multi-coloured gems that bathed the city in the reflective luminosity. Nestled at the bottom of the skyscrapers were dozens of magnificent and completely unique cafe’s and bars. The first cafe at the top was a marble building that looked like a mausoleum, with heavy columns. The second bar was completely different- a million lights flashed from every surface. The third cafe was a long, low building with the front made completely of glass that was patterned with hundreds of different patterns, and it had beanbags inside and low coffee tables. Another cabin was covered in flowers that had grown on the walls and doorway and another spectacular cabin was made of solid gold that seemed to glow in the sunlight.

Household Appliance Engineering Report: Standing Fan

Household Appliance Engineering Report: Standing Fan Household appliances  Engineering report Making of stand fan. Due date:24/03/2017 The introduction This report explores and examines the history and evolution of the stand fan detailing how they work and the materials used. The purpose of the report is to illustrate the functions and special features as well as to provide information about the social, environmental, sustainability and cultural connection that rose due to development and use of the stand fan. As the time progressed, technologies have drastically changed, the use of polymers and smaller sized powerful motors have allowed the stand fan to be lighter as well as improved performance and lowered the manufacturing cost when compared to heavy metals and bigger motors used in the past. a stand fan is a common household appliance used for cooling an area it is basically a traditional fan set on an adjustable pole which is attached to a base, it also contains at least 3 wind speed range. The earliest model of fans appeared during the 1800s it was basically a bipolar motor attached to a six-leaf shaped flat brass blades. These early fans were either a unique, or an expensive appliance, used in large offices or wealthy homes. The decade of 1910-1920 brought major changes. Around 1910, electric fans were being made for residential use, they had six wings and ran on slower speed and the cages were now made with steel due to lack of brass as well as the blades were rounded in shape and shrank from diameter of 8 down to 5. Description A stand fan is a common household appliance they are much more effective and popular than other table fans as it can be adjusted to move up and down as well as its head oscillates till 180 degree or remain steady pointing at one direction. A stand fan is just like a normal table fan but its set on an extendable pole which is attached to a base. It has three speed settings and an on off button usually named as 0. This type of fans is usually placed at a corner of the room or in an advantageous location to achieve greater cooling experience. 2.1 How it works Stand/pedestal fan works with the help of an electric motor. A motor consists of coil of wire wrapped around a metal center and when electricity is passed through this, it produces rotational motion and a hub/cap connects the motor with the metallic/plastic blade which circulates the air around, these blades are shaped on an angle which helps to carry air from one point to another. The control box contains four switches three to control speed and one to turn the fan on or off. The extendable pole can be used to increase or decrease the height of the fan. 2.2 Assembly Slide the 2-off base cross sections together. Remove the screws from the center of the base cross section, and then fasten the fan pillar in position. Now unscrew and remove the plastic retainer that locks the two support sections together slide over and fit the plastic base cover. Set the height of the extension pole and then lock into position with the plastic screwed retainer. Set the motor and switch control section over the extension pole and secure into position with the locking screw. Remove shaft protecting cover and unscrew guard retaining nut/hub/cap anti-clockwise and remove. Take the rear-guard section and slide it over the threaded screw on the fan body (make sure, the handle on the guard is facing upwards). Screw on the plastic nut/hub/cap to secure the rear guard in place. Push the blade on to the motor shaft until it reaches the stop. Screw on the blade retaining cap/hub/nut in a clockwise direction to secure the blade in position. Hook the front guard on to the rear-guard section at the top. Secure the two guard sections together with the clips around the edges. The screw and nut at the bottom of the grille MUST be fitted. Components Guard (rear and front grill) it is a metal netting used to protect fan blades from any physical contact this protects the fan from any damage as well as the user. Motor it is the heart of the fan as it converts the applied electrical energy into mechanical output energy. Blade these are the paddle shaped objects connected to the motor which spins and creates airflow Hub/cap it is a device which connects the fan blade with the motor. Extension pole this is the component that makes stand fan special, it allows the user to adjust the height of the fan according to their preference. Head support frame this component gives the stand fan its feature of tilting its head up or down. Switch box/ control box this is the component which contains the electric circuit and switches which controls the speed of the fan as well as turn it on or off. Component Material made from blades Polymer/aluminum Rear and back grill steel Extendable pole Polypropylene polymer/ metal Screws Metal (carbon steel/stainless steel) and plastic 3.1 Materials materials component Why it is used? Polymer/plastic -blades -Screws -Hub/nut/cap -switch -it is used because plastic would be more safer and cheaper than metals as well as it will decrease the weight of the fan. Metal (carbon steel/stainless steel) -extension pole -screw -guard (front and back grill) -it is used to make the product more durable Advantages and disadvantages 4.1 Advantage They are very easy to assemble also put them away when you are not using it as you can separate the components easily. You can move them around the house easily and put them in an advantageous location. Due to its extendable pole, you can adjust its height according to your preference. It is cheap and you can assemble it yourself. Theyre lightweight and can provide cool air over large area. They can be easily cleaned. 4.2 disadvantage Theyve less safety for children as they might stick their finger inside the grill. Cooling range is smaller. theres too much noise when the fan runs in higher speed. Impact on society This household appliance had a great impact on the society and peoples life. As before the invention of pedestal/stand fan there was only mechanical fans which required people to apply energy physically to cool the temperature or circulate air. When pedestal/stand, fan was invented it made peoples life way easier. During the early stage of the invention these fans were only used in big offices or wealthy homes but when refrigerated air was used in commercial buildings the fan makers focused more towards residential use. Then these types of fans started to appear at everyones home. The invention of pedestal/stand fan made life of the people more easier as they were cheaper and easy to assemble as well as it didnt need much maintainance. Conclusion The making of the stand fan and different materials used in the stand fan has been explored in this report. Pedestal/stand fan is usually made of polymers and metals like stainless steel, aluminum. They are more advantageous than other table or ceiling fans due to its extendable pole which allows the user to increase and decrease its height according to their preference and also because its cheaper than ceiling fans as well as it is easy to assemble.

The Origins Of The Church Of Scientology Essay -- Religion Scientology

During the dawn of the mid 20th century a new idea began to formulate within the mind of L. Ron Hubbard that would later give birth to what is known today as one of the fastest growing religions of the 21st century; this controversial religion is called Scientology. Scientology has acquired many individuals from all walks of life, ethnicities, and International regions of the world into its membership. According to the New Oxford American Dictionary the definition of Scientology is â€Å"a religious system based on the seeking of self-knowledge and spiritual fulfillment through graded courses of study and training.† In addition, Scientology claims to comprise the remedies used to deliver people from drugs and alcohol abuse, as well as, therapeutic solutions to help others recover from serious injuries at an astonishing progressive rate. In essence, this movement’s main agenda is to bring order to a world of chaos through spreading its teachings, improving environmental conditions on planet earth, and developing the holistic being through using different methodologies and technologies. Moreover, by obtaining a basic understanding of Scientology and its purpose we can now explore and uncover the answer to a question that sparks the curiosity of outsiders in western civilization; such a question is How did it Begin? The origins of this culture began in the year of 1923 when L. Ron Hubbard started his studies of the mind and spirit. Likewise, such studies resulted in the creation of a manuscript entitled Excalibur; this book was completed in 1938 but was never published. Furthermore, it was in this unpublished work that the word â€Å"Scientology† first appeared. The literal interpretation of the phrase means â€Å"the study of knowing how t... ...sion, my answer to the â€Å"church† of Scientology pertaining to the existence of God will be in the form of a philosophical question that states, if a tree falls in the forest and no one is around to hear it does it make a sound? Works Cited 1) Cooper, Paulette â€Å"The High Cost Of Scientology.† The Scandal Of Scientology. Web. 28th Nov. 1997 2) Communication Office Bulletin (HCOB). Hubbard, L. Ron. 18 July 1959. 3) â€Å"Dianetics.† New Oxford American Dictionary. Version 2.0.3 2005-2007. 4) lronhubbard.org/biography. N.P., 1995-2010. Web. 6 Nov. 2010 5) patheos.com. N.p., 1 Jan. 2008. Web. 6 Nov. 2010 6) â€Å"Scientology.† New Oxford American Dictionary. Version 2.0.3 2005-2007. 7) The New King James Version (NKJV) Bible. Ed. Thomas Nelson Nashville: 1982. 8) Watchman Fellowship. â€Å"What Christians Should Know about the Church of Scientology.† Web. 1 Jan. 2009.

Contradictions in the Great Gatsby Essay -- English Literature

Contradictions in the Great Gatsby They were known as the roaring twenty’s because the economy at the time was through the roof and people were partying all over the place. At the time there was a prohibition on the manufacturing and sales of intoxicating drinks. Since a lot of people did not feel like drinking gin they made in their bathtubs all the time, there was a huge market for organized crime. Organized criminals catered to the needs of the drinking public by illegally supplying them with liquor and made a fortune doing it. Even with all the crime in the jazz age, it will still be remembered for its glittering lights and unbridled romance. This just goes to show that life is filled with contradictions. Even with all the crime that went on, the twenties was still an era that was filled with excitement and joyous occasions. There are many contradictions in The Great Gatsby, written by F. Scott Fitzgerald, on one hand it’s glamorous, romantic and exciting and on the other hand it’s crude, corrupt and even disgusting. This double vision applies to people, places and events. Fitzgerald creates the roaring twenties by showing the division of society. The Buchanan’s live on one side, East Egg, and Jay Gatsby lives on the other side, West Egg. The West Egg is saturated with no rules or restrictions from past generations. It is a place that is filled with colorfulness yet everything clashes with each other. It has a sense of rawness to it and it is very much unstructured. The West Egg represents the fast moving-chaotic twenties. Gatsby is a part of West Egg society. West Eggers are the newly rich; the people who have worked hard and earned their money in a short period of time. Their wealth is based on... ...in the 1920s, where it has come from and where it is going. Jay Gatsby personifies the American Dream in modern terms, a perverse interpretation of what it was at inception. The American Dream is that anybody can pull themselves up by their bootstraps. Fitzgerald is saying that this is not necessarily true. He implies that socio-economical circumstances heavily influence a person’s ability to achieve the American Dream. America is an illusion, just an image that is presented. People in and outside America accepts the American ideals which are presented through the media, especially through visual mediums such as movies and television. This serves to create an ideal image of America which people hold falsely. When they try to achieve the American Dream, which is presented to them constantly, they realize the brutal reality which hides behind the illusion.

Understanding Electric Motors :: physics motor electricity

MOTOR BASICS BASIC COMPONENTS * Armature - Sometimes called a rotor. This is the part that spins. The armature can be either a permanent magnet or an electromagnet. * Stator - This is the part that doesn't move. The rotor spins in the magnetic field contained in the stator. HOW WORKS A MOTOR? The force that that turns the armature comes from the magnetic field of the armature trying to line up with the external magnetic field of the stator. This force is called torque. This torque will cause the armature to turn until its magnetic field is aligned with the external field, but no further. How does the armature continue to spin? One of the magnetic fields must be changed so that the armature has to turn again. The armature will spin so long as there is always a torque acting on it. How this is accomplished is what sets each type of electric motor apart. DIRECT CURRENT MOTORS SIMPLE DIRECT CURRENT MOTOR In a DC motor, the armature consists of any number of windings, each one an electromagnet. The armature is immersed in a directional external magnetic field. This external field does not move, and can come from permanent magnets or electromagnets. A direct current in a set of windings creates a polar magnetic field. A torque acts on the rotor due to its relation to the external magnetic field. Just as the magnetic field of the rotor becomes fully aligned with the external magnetic field, the direction of the current in the windings on the armature reverses, thereby reversing the polarity of the rotor's electromagnetic field. A torque is once again exerted on the rotor, and it continues spinning. The change in direction of current is facilitated by the split ring commutator. The brushes remain stationary, but they are in contact with the armature at the commutator, which rotates with the armature such that at every 180Â ° of rotation, the current in the armature is reversed. BRUSHLESS DIRECT CURRENT MOTOR A brushless DC motor has a permanent magnet or magnets for the armature. The external magnetic field comes from any number of electromagnets that are turned on and off at the correct times by a timing device. The exact workings of different brushless DC motors depend on the type of timing device used. This example uses a Reed switch.

A Levels

w w ap eP m e tr .X w *6364028069* 9701/05 CHEMISTRY Paper 5 Planning, analysis and evaluation October/November 2007 1 hour 15 minutes Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your Centre number, candidate number and name on all the work you hand in. Write in dark blue or black pen. You may use a soft pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, highlighters, glue or correction fluid. DO NOT WRITE IN ANY BARCODES. Answer all questions. You are advised to show all working in calculations.Use of Data Booklet is unnecessary. At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question. For Examiner’s Use 1 2 Total This document consists of 9 printed pages and 3 blank pages. SPA (NF/CGW) T30933/8  © UCLES 2007 [Turn over om .c s er UNIVERSITY OF CAMBRIDGE INTERNATIONAL E XAMINATIONS General Certificate of Education Advanced Subsidiary Level and Advanced Level 2 1 The hydroxides of Group I metals (LiOH, NaOH, KOH, RbOH, CsOH) are highly corrosive white solids which rapidly absorb water vapour on exposure to the atmosphere.All of these solids dissolve exothermically in water. The enthalpy change of solution, ? Hsoln, is the energy change associated with the following reaction. M represents the Group I metal. M +(aq) + OH–(aq) M OH(s) + (aq) The following diagram represents theoretical stages in the formation of aqueous MOH. M +(g) + OH-(g) + (aq) lattice energy hydration enthalpy of the ions H hydration M OH(s) + (aq) H soln M +(aq) + OH-(aq) Lattice energy and hydration enthalpy are both more exothermic when ions carry a higher charge and/or ions have a smaller radius. When comparing Group I hydroxides, changes in ?Hhydration are more significant than changes in lattice energy. (a) By considering trends in the size and charge of the ions, pred ict the likely trend in ? Hsoln from LiOH to CsOH and sketch your prediction. †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Hsoln LiOH NaOH KOH RbOH CsOH [2]  © UCLES 2007 9701/05/O/N/07 For Examiner’s Use 3 (b) The enthalpy change of solution, ? Hsoln, for any Group I hydroxide can be measured For Examiner’s Use experimentally in the laboratory. In experiments to compare ? Hsoln for LiOH, NaOH, KOH, RbOH, CsOH state the independent variable †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ , the dependent variable †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦. the other variable to be controlled †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦. †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦. . [3] (c) Draw a labelled diagram to show the apparatus you would use to obtain data from which ? Hsoln could be determined. From the information given on page 2 and the apparatus you plan to use, identify two possible sources of error in the experiment and state how you would minimise the effect of each. rror 1 †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦.. †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚ ¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ error 2 †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦.. †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ [3] d) Identify a health and safety risk in the experiment and explain how you would minimise it when carrying out the experiment. †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚ ¬ ¦Ã¢â‚¬ ¦ [2]  © UCLES 2007 9701/05/O/N/07 Turn over 4 (e) Describe the procedure you would carry out to find the enthalpy change of solution, ? Hsoln, for one of the Group I hydroxides. Your plan should give a step-by-step description of the method, including †¢ how you would measure the independent variable, †¢ how you would measure the dependent variable, †¢ appropriate masses and volumes of reagents. The following data may be of use in planning the detail of your experiment. Ar: Li, 6. 9; Na, 23. 0; K, 39. 1; Rb, 85. 5; Cs, 133. 0, O, 16. 0; H, 1. 0 4. 3 J are required to raise the temperature of 1. cm3 of any solution by 1 °C. †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ †¦Ã¢â‚¬ ¦ †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ 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[4]  © UCLES 2007 9701/05/O/N/07 For Examiner’s Use For Examiner’s Use 5 (f) The procedure is repeated for each of the Group I hydroxides. Show how you would tabulate the results for all the experiments. [1] (g) Show how you would use the results of one experiment to calculate the enthalpy change of solution, ? Hsoln, for the reaction. [1] [Total: 16]  © UCLES 2007 9701/05/O/N/07 [Turn over 6 2Students were asked to investigate how the rate of reaction between magnesium ribbon and hydrochloric acid varied with change in concentration of the acid. 2HCl(aq) + Mg(s) MgCl2(aq) + H2(g) Student 1, looking at the equation, suggested the following. rate of production of hydrogen gas = k[HCl ]2 This student used the following apparatus to investigate the rate of production of hydrogen gas, H2. gas syringe magnesium ribbon dilute hydrochloric acid The student used a 500 cm3 measuring cylinder to measure 100 cm3 of dilute acid into a conical flask. A 1 cm length (0. 1 g) of magnesium ribbon was dropped into the acid in the flask and the stopper quickly replaced in the flask. The stop-clock was started and the volume of gas collected was measured at 0. 5 minute intervals. The results of the experiment were recorded as shown in the table below. time / min time / min volume of H2 / cm3 0. 5 15. 5 5. 5 80. 0 1. 0 25. 0 6. 0 82. 5 1. 5 34. 0 6. 5 85. 0 2. 0 43. 0 7. 0 87. 0 2. 5 51. 0 7. 5 87. 5 3. 0 59. 0 8. 0 91. 0 3. 5 65. 0 8. 5 92. 5 4. 0 69. 5 9. 0 93. 5 4. 5 74. 0 9. 5 94. 5 5. 0  © UCLES 2007 volume of H2 / cm3 75. 0 10. 0 95. 0 9 701/05/O/N/07 ForExaminer’s Use For Examiner’s Use 7 (a) Plot a graph of volume of hydrogen produced against time. [2] (b) Identify clearly on your graph any anomalous readings and suggest a reason for these anomalous readings. †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ [1] (c) On the graph you have plotted, construct a line from which you can calculate the initial rate of reaction.Calculate the initial rate of reaction and show your working. initial rate = †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦.. cm3 min–1 [2]  © UCLES 2007 9701/05/O/N/07 [Turn over 8 (d) By considering the experimental method described, explain why the plotted line does not pass through 0,0. †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ 1] (e) Identify a further source of error in the method describ ed and suggest a change to the method to reduce this error. †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚ ¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ 1] (f) Students 2-8 carried out similar experiments with different concentrations of acid. The initial rate of reaction was calculated for each of their experiments and is shown in the table below. Enter in the table the initial rate you have calculated for Student 1. student volume of acid used / cm3 volume of water used / cm3 mass of magnesium used /g initial rate relative concentration of acid / cm3 min–1 1 100 0 0. 01 2 45 55 0. 01 8. 0 3 90 10 0. 01 16. 4 4 60 40 0. 01 11. 5 5 100 100 0. 01 9. 3 6 35 65 0. 01 6. 8 7 80

A Semiotic Approach on How Meaning Can Be Created in an Audience

A Semiotic Approach on How Meaning can Be Created In An Audience â€Å"Human intellectual and social life is based on the production, use, and exchange of signs† (Danesi, 2002) As Danesi (2002) states, signs are an integral part of society; from watching television, listening to music, reading, writing or talking, we are engaged in sign based behaviour. This engagement with signs is known as the study of semiotics.Dating back to 460-377BC, with the founder of Western medical science, Hippocrates, coining the term, then known as semeiotics, he described signs consisting of three dimensions; the physical dimension, known as the signifier, the referent, or signified, and the signification (Danesi, 2002). These dimensions only have meaning when â€Å"it has someone to mean to† (Williamson, 1978). In the 20th century, semiotic theory was developed by a group of semioticians, linguists, psychologists and cultural theorists, based on the saussurean-Piercean paradigm (Danesi, 2 002).First introduced to the public in the 1950’s by Roland Barthes, to describe our mediated culture, semiotics is essential when creating an advertisement. Among other things, semiotics plays a significant role in engaging the intended audience- the buyer. Whether it is the elderly, teens, children, men or women, the placement of colours, text, images and other signs, play a key role in the success of the advertisement (Scott, 1994).By taking a semiotic approach, this essay will demonstrate how meaning can be created in an audience, by the analysis of two advertisements, and discussing how codes and context are central in the ‘anchoring’ of meaning. First introduced by Roland Barthes (1977), the notion of anchorage, discusses the linguistic essentials that can help anchor, or constrain, how a reader interprets an image: â€Å"to fix the floating chain of signifieds† (Barthes, 1977). The advertisements chosen are from differing and contrasting magazines; the first from iconic fashion magazine Vogue and the other from a men’s magazine, Men’s Health.These differing genres have been chosen to illustrate how contexts and codes within specific social relations, groups, classes, institutions, structures and things (Thwaites, Davis and Mules, 2002) play an integral role in creating meaning (Scribd, 2012). Much of what we have come to understand about society, is learnt from the texts that are presented around us; through Hollywood blockbusters, to novels and magazines. Chandler concludes that â€Å"life is thus lived through texts and framed by texts to a greater extent than we are normally aware of† (Chandler, 2001).This means that advertisements not only refer to ‘real world’ concepts that we deal with day to day, but they also make reference to other texts. The level of this ‘intertextuality’ (Fiske, 1987) is what influences social beliefs and ideals in the world we live in. The advertiseme nt from Vogue (See ad 1) features a sepia- colour scheme, with an alluring female to the right, and a bottle of ‘j’adore Dior’ perfume, to the left. Many signifiers are present in this advertisement; the female (Charlize Theron), is dressed in an elegant gold beaded dress, with a high beaded neckline, drawing the viewers eye to her strong jaw-line and bronzed face.Her pose is that of elegance and power, the background light shining around her slim figure. The colour of the clothing, and overall image, compliment the golden-sepia tone of the bottle of perfume on the left. Chandeliers are placed around the perfume bottle, and out of focus behind the woman. The signifieds present are; the gold dress giving an impression of the woman being a high profile member of society of, chandeliers are present in homes of the wealthy and the sepia tones represent warmth. By using a female of celebrity status, the advertisements appeal rises with the wider female audience, due t o her known status.The key connotations featured in this advertisement are; the gold coloured dress connotes wealth, elegance and popularity. The powerful and elegant stance of the woman connotes power a female will gain when wearing this fragrance. Due to her celebrity status, the audience can also feel empowered, with a ‘celebrity’ status. The sepia tones connote warmth, and invite the viewer to become involved with the advertisement. Along with the bronzed body of the woman, the French writing j’adore (meaning I love) adds an essence of romance, and connotes desire, and sex appeal.As the ad connotes power, it is open for both upper and lower/middle class woman to interpret. Upper class woman could strive to maintain power, whilst lower class desire to gain power, by using the product. The way the creators of the ad have placed the female in this position, in these surroundings, to represent the product, has been done deliberately to target the desired audience ; woman have a desire to feel beautiful, powerful, and sexy, therefore the creator has appropriately placed the advertisement in a women’s very well known and popular fashion magazine, to gain maximum results from the targeted audience.Leiss (1990) states that â€Å"at the core of advertising’s purposes now is not the message itself as a communicator of meaning, but rather its relationship to the audience† (Leiss et al. , 1990). With the development of the theory of marketing segmentation, it is logical to therefore conclude that creators of advertisements don’t focus on the product, but the signs and codes that connate particular meanings of positivity that are related to a certain lifestyle, culture, or social group (Scribd, 2012).The connotations pervade media representations, and symbolise psychological or social themes and situations that are familiar and understandable to the audience (Danesi, 2002), in order to successfully sell the product. The ad vertisement from the Men’s Health (see ad 2), is selling ‘Tom Ford Perfume’. This somewhat controversial ad has many key signifiers. The male figure lying on a bed is the predominant focus, followed by a female hand with red nail polish touching the male’s chest. The object that is being advertised is only shown as a half.The basic colour scheme is black and white, with the exception of the red nail polish and orange cologne bottle. The signifieds present are; the male is an essential selling point of the advertisement, therefore he takes up the majority of the page. Sex appeal is what the advertiser is trying to convey, and the glimpse of a female hand can be seen as elegant and flirty. The key connotations are; the male figure as desirable and powerful- every woman would want an intimate connection with him. The red fingernails connote passion, desire, lust, and a thirst for action (Danesi, 2002).By using this cologne, the advertisement connotes that the user will become the ultimate object of desire, playing in to the male want of intimate connections with females. As the male figure has ‘sex appeal’ the advertisement encourages the partner of a male to purchase the fragrance, so she could have a ‘sexy’ male partner. The orange tone of the cologne bottle connotes warmth, stimulating the senses. When producers try to convey certain meanings, audiences may or may not assign the same meanings (Littlejohn, 1996).As mentioned in the first analysis, the advertisement is open to other audiences, whilst the male cologne ad is more closed, but it is up to the reader to decide whether or not they belong to the context or not. Signs are combined in to texts, but a text has no meaning on its own (Smagorinsky, 2001). It draws value from surrounding elements and from reader association, but also from what it is not (Littlejohn, 1998). The amalgamation of these creates the context in which the text functions; if you are n’t a wearer of perfume or cologne, you will have no interest in what it is trying to sell you, hence the importance of context.Thwaites and colleagues (2002) mention that â€Å"the social situations in which a sign is used may determine the appropriate content, type of sign and coding; signs contextual functions indicate the context in which it operates (Thwaites, Davis and Mules, 2002). Chandler explains that Stuart Hall pointed to the role of social positioning in the interpretation of mass media texts by different social groups (Chandler, 2001). Hall also suggested three hypothetical models of interpretive codes or positions for the reader of a text (Hall, 1980). But what Hall and also Chandler miss, is what happens when you don’t understand an advertisement at all?Because, as Griffin says; â€Å"like chameleons that take on the colouration of their environment, words take on their meaning of the context in which they are used† (Griffin, 2000). The opinion that the usefulness of semiotics decreases and is above all dependant on the skill of the interpreter is not new. Leiss (1990) argues that a key drawback for semiotics is that â€Å"it is heavily dependent upon the skill of the individual analyst† (Leiss, 1990). Less skilful analysts â€Å"can do little more than state the obvious in a complex and often pretentious manner† (Leiss, 1990).As Littlejohn (1996) states â€Å"meanings of a message are affected by events outside the message itself†, therefore the most successful advertisements focus on making sure the audience understands the content being conveyed (codes) and the content lays emphasis on certain meanings over others (context). In this perspective, the kind of magazine reflects how meanings are emphasised. Bignell (1997) even argues that â€Å"as well as being a collection of signs, the magazine is a sign in itself† (Bignell, 1997), the magazine is therefore a â€Å"powerful ideological forceâ €  (McRobbie, 2000) in society.Even though some postmodernists believe that texts are endlessly polysemic (Barthes 1977, Fiske 1987), meanings are still able to be communicated. Leiss (1990) argues that â€Å"for advertising to create meaning, the reader or viewer must do some ‘work’, because the meaning is not lying there on the page, one has to make an effort to grasp it† (Leiss et al, 1990). When analysing both of these advertisements, this statement is correct- the creators of the ad have given the reader ‘A and C’ but the reader must fill in the blank, or as it is known in this example, B.The application of semiotics in advertising varies significantly depending on the product being sold. Common themes almost always stay the same- the sense of freedom or excitement you get from purchasing a specific car or the feeling of popularity when you drink a certain type of alcohol (Messaris, 1997). This is done by using specific images, which resonate with the intended audience. For example, if there is an advertisement for a new Jeep, images of it going through all types of terrain will be shown, or alcoholic beverages are advertised at a party scene, all to make the audience want to buy the product (Messaris, 1997).As Chandler and Bignell suggest, signs and codes can be a medium itself, and described by Leiss (1990) â€Å"an ad is a mediator between creator and reader, standing at the confluence of the double symbolic process in the marketplace, where producers of goods try to attempt to construct one set of meanings, and where consumers use these meanings (along with meanings drawn from other sources) in the construction of their own lifestyles† (Leiss et al. , 1990).This is why semiotics is significant, even on a basic level, as it can show us how meanings have the ability to both construct and maintain particular social attitudes and ideals of a specific society. On a multifaceted level, the notion of intertextuality is intriguing and should be studied more widely as it exposes the many intricate ways in which contexts transfer from each other, showing how the contexts migrate from one another and portray the uncertainty of meaning. Appendix Ad 1. Ad 2. Bibliography Barthes, R. 1977, Image-Music-Text, London. Bignell, J. 1997, Media Semiotics: An Introduction, Manchester: Manchester University Press.Chandler, D (2001), â€Å"Semiotics, the basics†, Routledge. Culler, J. 1985, Saussure, London. Danesi, M. 2002, ‘An Outline of Semiotic Theory’, In Understanding Media Semiotics, London, pp 28-53. Dior, 2012, (‘Dior Advertisement’), Vogue Magazine, June 2012, pp. 1-2. Fiske, J. 1987, â€Å"Intertextuality† in Fiske, J, Television culture, Methuen Griffin, E. 2000, Communication; a first look at communication theory, McGraw-Hill. Hall, S, 1980, Encoding/decoding, In Centre for Contemporary Cultural Studies (Ed. ): Culture, Media, Language: Working Papers in Cu ltural Studies, London. Leiss, W. Kline, S. & Jhally S. , 1990, Social Communication in Advertising: Persons, Products and Images of Well-Being, 2nd Edn, London. Littlejohn, S. 1996, Theories of Human Communication, 5th Edn, Wadsworth. McRobbie, A. 1995, Feminism and Youth Culture, 2nd edition, Macmillan Press, London. Messaris, P. 1997, Visual Persuasion: The Role of Images in Advertising, Sage. Scott, M. 1994, ‘Images in Advertising: The need for a Theory of Visual Rhetoric, Journal of Consumer Research, vol. 21 No. 2, pp. 252-273. Scribd 2012, Scribd, Date Accessed 25 May 2012, http://www. scribd. om/doc/22099314/Semiotic-analysis-of-two-ads? &lang=en_us&output=json&session-id=74ea6fd65172766fface3eec2d5bfb14. Smagorinsky, P. 2001,’ If meaning is constructed, what is it made from? Toward a cultural theory of reading’, Review of Educational Research, vol. 71, pp. 133-169. Tom Ford, 2010, (‘Tome Ford Advertisement’), Men’s Hea lth Magazine, March 2010, pp. 2. Thwaites, T. , Davis, L. & Mules, W. 2002, Introducing Cultural and Media Studies; a semiotic approach, New York. Williamson, J. 1978, Decoding Advertisements; Ideology and Meaning in Advertising, London.