Spectrophotometry

Spectrophotometry: is a device to measure the amount of light in the material used. this device consists of two parts: the first is the light source, and the second is the photometer . the work principle of this device : the liquid or material that we want to measure the elements inside is placed in a tub, this tube is then placed between the light source and the photometer . So that the amount of light passing through the sample is measured by photometer. when a photometer is exposed to light, it acquires or generates an electrical signal that changes with the amount of light absorbed by the liquid . this change in light absorption depends on the change in the concentration of the substance. the way work this device: this device it measures the absorption of light by liquid materials at different wavelengths, and thus can identify a number of unknown substances or calculate known concentrations of materials . Stepped flow Technique:is a rapid mixing device, to study the kinetics of quick chemical reactions in solutions . this device contains two reactants which are kept in separate reservoirs and are prevented from flowing freely . the interaction starts by installing the reactants in the device. these materials are then released to the mixing chamber, which mixes these interacting materials , the reaction is then monitored by observing the change in the absorption of the reaction solution . When the reaction progresses, it fills the â€Å"stop syringe† that expands until it reaches the point at which the interaction reaches a continuous flow , thus stopping flow or interaction sodium reacts strongly and quickly with water and produces a solution of sodium hydroxide and hydrogen gas, a colorless solution. During the reaction sodium can be heated and It may ignite and burn with an orange flame . Hydrogen gas released during the combustion process reacts with oxygen in the air . The resulting solution is basic because of the melting of sodium in the water. this interaction between sodium and water is an exothermic reaction. sodium reaction with water is the closest to explosion. Na +2 H2O ?2 NaOH + H2. this search used this interaction and because it is fast, it uses the stepped-flow techniques method to control it Rate=- (d[Na])/dt=-1/2 (d[H2O])/dt=1/2 (d[NaOH])/dt+(d[H2])/dt Spectrophotometry Spectrophotometry is a vary specific type of Spectroscopy which measures how much light is absorbed by measuring the intensity of the light beam that is not absorbed (transmittance).The word â€Å"Spectra† means the range of wavelength, â€Å"Photo† means light or photons and â€Å"Metry† is the measuring how much light a chemical substance absorbs which it calls the absorbance. But what we do is measure how much light of the original light beam gets through (transmittance). So, those are related to each other absorbance and percent transmittance mathematically.The basic way to works is the incident light which usually contain different kind of wavelength, for example when we see something have a red color that means the object is absorbs all colors' wavelength except red. It is helpful to know the color wheel because the color wheel will help you to understand or getting the idea of where in the visible spectrum you would except to see the best absorbance.The work principle of spectrophotometry in (Figure 1): Firstly, we have a light source typically white light contains all wavelengths. We want to collimate the light or make all the wavelengths parallel to one another so, the special collimator or lens can does that, then we pass the light beam through a prism to splits the light into its various wavelength so, for regular white light you get all the colors of the rainbow. Spectrophotometer does not just shine all that light at the sample, it shines a vary specific wavelength of light and we can choose that normally by moving a slit in the way of the one wavelength of light or color that we would like to shine through the sample. That particular color of light will then shine through the sample, some of it will be absorbed and some of it will be transmitted. (Io) is the incident light that is the first enters, and (It) is the amount of light that is transmitted through after some has been absorbed. The remaining light that gets through hits a photocell, photocell is a solid-state detector that picks up how much light, then it prints out on a digital display either absorbance how much was taken away or percent transmittance how much light go through and those two are related. Briefly,  you can determine the unknown concentration of the sample by using Beer-Lambert Law which states: there is a linear relationship between the absorbance and the concentration of a sample. Mathematical formula of Beer's Law is: A=?lcA  is the measure of absorbance.?  is the molar extinction coefficient or molar absorptivity.l  is the path length.-439528256528center842086600left221268Figure 100Figure 1c  is the concentration (which is required).There are special techniques for investigating fast reactions which have half-live less than a few secondsLet us take an example for the simplest fast reaction technique (the continuous flow method) which will be used to study the kinetics of the formation of the ferric thiocyanate complex FeSCN+22120900145742100 For the fast reaction between ferric and thiocyanate ions in an acid solution of constant pH, the observed behavior is consistent with the simple mechanism: center2191301Where kf is the bimolecular forward rate constant and kr is the unimolecular reverse rate constant. So, the rate law from this equation is:center27279960Recall that the equilibrium constant K is related to the rate constant by:15775923297435 Where the sign ? means the equilibrium (t=?) value:31439213903453641206384715300At any time (t), Using these relations, and then rewrite the equation in the form:1965852489141700To simplify the integration of this equation, we will choose the experimental conditions such that [Fe+3] ;; [SCN-]. This will allow us to assume that [Fe+3] is essentially constant during the reaction. The initial conditions are chosen so that [FeSCN+2]0= at t=0 we find:This an approximate solution which becomes exact only when [Fe+3] is constant. In real practice, [Fe+3]0 will be chosen to be ten times larger than [SCN-]0, so that [Fe+3] will be more by about 10 percent during the reaction.2803525690943500-569595690918400If a plot of ln](FeSCN+2)? – (FeSCN+2)[ versus t is linear, then the first order dependence on [SCN-] and [FeSCN+2] is confirmed. The rate dependence on [Fe+3] has been established as first order. -5779714625Schematic diagram of system for driving reactant solution.00Schematic diagram of system for driving reactant solution.452856889798Spectrophotometry setup00Spectrophotometry setupProcedure for an example of use Spectrophotometer technique in fast reaction: Firstly, turn on the spectrophotometer and leave it warm up before using. The wavelength setting should be 455 nm throughout the entire experiment. With both reagent stopcocks A and B and the vent stopcock V closed, slowly increase the gas pressure on the reagent solutions until Bourdon pressure gauge indicates about 500 Torr pressures above 1 atm. With the outlet stopcock C open, open and close the reagent stopcocks A and B several times to make sure that both solutions are flowing smoothly and to remove any air bubbles from the system. Use a beaker to catch the outflow from the capillary tube. Then set the capillary frame at the first fiducial mark which nearest to the mixing chamber, and carry out the three following steps:1- Open Stopcock A and allow the Fe+3 solution to flow for a sufficient time to remove from the capillary tube any solution containing FeSCN+2 species. Then close stopcock A and the outlet stopcock C.2- Open the outlet stopcock C then turn both stopcocks A and B to their fully open positions. Catch the outflow of solution from the capillary in a beaker until the flow becomes stable. Then quickly switch the outlet tube from the beaker to a volumetric flask and simultaneously start a timer. When It is full, stop the timer and record the time. Return the outlet tube to the beaker. Then carrying out the above flow rate measurement, you should determine the absorbance A of the reaction mixture and record that value together with the distance x from the mixing chamber. Work quickly to avoid any interference of the reagent solution.3- When both the flow and absorbance measurements are complete, close the outlet stopcock C and then close both stopcock A and B. This is a crucial step in the procedure. If A and B are left open, solution may siphon from one carboy to the other. After a few minutes, determine the absorbance again to obtain the infinite time value. Verify that this value does not change after one more minute. For the next run, move the capillary support frame so as to line up the second fiducial mark and repeat the first and third steps at this this new distance setting, be careful in moving the capillary support frame.Make two runs at each of the six or seven positions along the capillary tube. Use special care in making the absorbance readings at large values of x. If time permits, you should also take data at a different driving pressure. Either increase or decrease the gas pressure depending on weather you need more data at low percent reaction or at high, but it may not be safe to exceed about 700 torr overpressures.In this experiment, more of solution A will be used up than solution B if the Fe+3 solution is always used in the first step to make the zero adjustment of the spectrophotometer at each distance setting. The resulting change in the liquid level for A relative to that for solution B may change the relative flow rates of these solutions. This can be avoided by alternating the use of solution A and B for making the zero adjustments.References:1- Physical chemistry by  Gilbert William Castellan.2- msu.edu.3- Wiley online library. 4- UKessay.5- AliHayek.com Spectrophotometry 5448300-52387500-523875-53340000 Kinetics Chemistry Student Name:Saba Ahmad Bin Humaid Supervisor:Dr. Alia Abdulaziz Alfi Group Number: 41438-1439 Spectrophotometry is a technique which can be used for identifying reactants' concentrations.Spectrophotometry is an absorbance device which can measures the fraction of the incident light transmitted through a solution. More clearly, it is used to measure the amount of light that passes through particles of the sample and by differentiation of the initial intensity of light reaching the sample, it indirectly measures the amount of light absorbed by that sample. Spectrophotometers are made to transmit light of narrow wavelength ranges. A certain compound will not absorb all wavelengths evenly that's why things have different colours. Some compounds absorb only wavelengths outside of the visible light spectrum and that's why there are colourless solutions such as water. Because different compounds absorb light at different wavelengths, a spectrophotometer can be used to differentiate compounds by analyzing the type of wavelengths absorbed by a given sample. In addition of that, the amount of light absorbed is directly proportional to the concentration of absorbing compounds in that sample, so a spectrophotometer can also be used to determine concentrations of compounds in solution.To studying a compound in solution by spectrophotometry, you put it in a sample holder called a cuvette and place it in the spectrophotometer. Light of a specific wavelength passes through the solution inside the cuvette and the amount of light transmitted or absorbed by the solution is measured by a light meter. While a spectrophotometer can exhibit measurements as either transmittance or absorbance, in biological applications we are usually interested in the absorbance of a given sample. Because other compounds in a solution (or the solvent itself) may absorb the same wavelengths as the compound being analysed, we compare the absorbance of our test solution to a reference blank. The reference blank should contain everything found in the sample solution except the substance you are trying to analyse or measure.Briefly,-5143507591425003467100758190000  you can determine the unknown concentration of the sample by using Beer Lambert Law which states: there is a linear relationship between the absorbance and the concentration of a sample. Mathematical formula of Beer's Law is: A=?lcWhere:A  is the measure of absorbance.?  is the molar extinction coefficient or molar absorptivity.l  is the path length.c  is the concentration (which is required).There are special techniques for investigating fast reactions which have half-live less than a few secondsLet us take an example for the simplest fast reaction technique (the continuous flow method) which will be used to study the kinetics of the formation of the ferric thiocyanate complex FeSCN+22120900145742100 For the fast reaction between ferric and thiocyanate ions in an acid solution of constant pH, the observed behavior is consistent with the simple mechanism: center2191301Where kf is the bimolecular forward rate constant and kr is the unimolecular reverse rate constant. So, the rate law from this equation is:center27279960 Recall that the equilibrium constant K is related to the rate constant by:15775923297435Where the sign ? means the equilibrium (t=?) value:31439213903453641206384715300At any time (t), Using these relations, and then rewrite the equation in the form:1965852489141700To simplify the integration of this equation, we will choose the experimental conditions such that [Fe+3] ;; [SCN-]. This will allow us to assume that [Fe+3] is essentially constant during the reaction. The initial conditions are chosen so that [FeSCN+2]0= at t=0 we find:This an approximate solution which becomes exact only when [Fe+3] is constant. In real practice, [Fe+3]0 will be chosen to be ten times larger than [SCN-]0, so that [Fe+3] will be more by about 10 percent during the reaction.2803525690943500-569595690918400If a plot of ln](FeSCN+2)? – (FeSCN+2)[ versus t is linear, then the first order dependence on [SCN-] and [FeSCN+2] is confirmed. The rate dependence on [Fe+3] has been established as first order. -5779714625Schematic diagram of system for driving reactant solution.00Schematic diagram of system for driving reactant solution.452856889798Spectrophotometry setup00Spectrophotometry setupProcedure for an example of use Spectrophotometer technique in fast reaction: Firstly, turn on the spectrophotometer and leave it warm up before using. The wavelength setting should be 455 nm throughout the entire experiment. With both reagent stopcocks A and B and the vent stopcock V closed, slowly increase the gas pressure on the reagent solutions until Bourdon pressure gauge indicates about 500 Torr pressures above 1 atm. With the outlet stopcock C open, open and close the reagent stopcocks A and B several times to make sure that both solutions are flowing smoothly and to remove any air bubbles from the system. Use a beaker to catch the outflow from the capillary tube. Then set the capillary frame at the first fiducial mark which nearest to the mixing chamber, and carry out the three following steps:1- Open Stopcock A and allow the Fe+3 solution to flow for a sufficient time to remove from the capillary tube any solution containing FeSCN+2 species. Then close stopcock A and the outlet stopcock C.2- Open the outlet stopcock C then turn both stopcocks A and B to their fully open positions. Catch the outflow of solution from the capillary in a beaker until the flow becomes stable. Then quickly switch the outlet tube from the beaker to a volumetric flask and simultaneously start a timer. When It is full, stop the timer and record the time. Return the outlet tube to the beaker. Then carrying out the above flow rate measurement, you should determine the absorbance A of the reaction mixture and record that value together with the distance x from the mixing chamber. Work quickly to avoid any interference of the reagent solution. 3- When both the flow and absorbance measurements are complete, close the outlet stopcock C and then close both stopcock A and B. This is a crucial step in the procedure. If A and B are left open, solution may siphon from one carboy to the other. After a few minutes, determine the absorbance again to obtain the infinite time value. Verify that this value does not change after one more minute.For the next run, move the capillary support frame so as to line up the second fiducial mark and repeat the first and third steps at this this new distance setting, be careful in moving the capillary support frame.Make two runs at each of the six or seven positions along the capillary tube. Use special care in making the absorbance readings at large values of x. If time permits, you should also take data at a different driving pressure. Either increase or decrease the gas pressure depending on weather you need more data at low percent reaction or at high, but it may not be safe to exceed about 700 torr overpressures.In this experiment, more of solution A will be used up than solution B if the Fe+3 solution is always used in the first step to make the zero adjustment of the spectrophotometer at each distance setting. The resulting change in the liquid level for A relative to that for solution B may change the relative flow rates of these solutions. This can be avoided by alternating the use of solution A and B for making the zero adjustments.References:1- Physical chemistry by  Gilbert William Castellan.2- msu.edu.3- Wiley online library. 4- UKessay.5- AliHayek.com

Porter’s Five Forces Analysis done on Harley Davidson Essay

Harley Davidson remains as a dominant force in the heavy weight motorcycle industry; upholding 50% share in the heavy weight motorcycles. This year they celebrate their 110th Anniversary proudly as the only major motorcycle manufacturer to completely focus on motorcycles. (Melief, Bundgaard & Hathaway, 2006) Other major players in the Motorcycle Industry are, Honda, Yamaha, Suzuki that also have their other major product lines inclusive of cars, watercraft, musical equipment and etc. Assessment of Strengths and Weaknesses of Current and Potential Competitors Porters Five Forces Analysis Source: Vector (2012) Internal Rivalry The heavyweight motorcycle market is justly concentrated with four major companies manufacturing these vehicles. Harley Davidson being one of the most experienced within the industry, Honda, Suzuki and Yamaha are the competitors that are all from Japan. Over the past few years many market for heavyweight motorcycles has increased annually, but experts are predicting even though the market is growing it will slow down in the years to come. (Melief, Bundgaard & Hathaway, 2006) The Competitive challenge is high in motorcycle industry. Most of the time motorbikes are counted as a luxury product and pricing the products can be complex. (Oxbridge Writers, 2012) Harley Davidson offers spare parts, extended warranties, and innovative and environmental friendly motorbikes for their customers, this singularizes them from their competitors. Japan’s companies have marked their success by establishing a strong competitive place in the market using cheap prices as their strategy. This affects customers perception on Harley Davidson’s place in the market and their prices. However, those having a predominant place in this sport do have conflicting interests, i. e. Yamaha and Honda have diversified into musical instrument and other motor vehicles. . (Oxbridge Writers, 2012) This results Harley-Davidson in differentiating themselves as a loyal, specialized Motorbike Company and getting more customers. Harley Davidson has traditionally been the prevailing competitor in this market with taking over 50% of the market share. With time it has fallen to below 50 % due to other companies expanding their heavyweight motorcycle production and growing in the market, focusing on American Consumers. (Melief, Bundgaard & Hathaway, 2006) This is because other products from competitors are becoming less distinguished and is similar to Harley Davidson Products. Recalling, back to the past it was easier to acknowledge Harley Davidson motorbikes for their unique style, but currently Japanese Manufacturers are merging popular designs to their products. As a result motorbikes from manufacturers are becoming more similar over time. This forces Harley-Davidson to focus more on their branding to maintain the customers. This can be an advantage to them, since Harley is known internationally for their brand, many people would prefer a Harley over a Honda or Suzuki. But can also be a downfall since Japanese companies has been improving their products with time. Threat of New Entrants This industry has a very high entry barrier, as it requires high capital to enter to the market. Similar to most manufacturing industries there are significant economies involved in building motorbikes. (NCCU, 2012) The manufacturing price of a similar product is extremely high in this industry even for a small scale. This is basically one of the main reasons there are only four major players in the industry. There are some small-scale motorcycle creators whose business s fully focused on reputation and appeal to motorcycle devotees, to build utterly customized bikes. They do not produce enough motorbikes to threaten the major players in the industry. They do not affect the position of Harley Davidson in the market but can be an added advantage since it increases interest of motorbikes in the public. Threat of Substitutes and Complements Heavyweight motorcycles are a luxury item for the majority of consumers, so there are very less similar substitutes for heavyweight motorbikes that could seriously affect the market and consumers. (Melief, Bundgaard & Hathaway, 2006) The Japanese manufacturers focus their designs more on smaller, quicker motorbikes that is the closest substitute followed by cars and scooters. Heavyweight bikes portray a certain persona, which is a part of the buyer’s influences on choosing a motorbike. Smaller bikes are for different riding styles and purposes. They are designed for a different seating position unlike the heavyweight motorbikes. Passenger cars can be a substitute for heavyweight motorbikes but it is a weak substitute. (NCCU, 2012) Motorbike consumers rarely purchase Harley’s to fulfill transportation wants. Harley Davidson bikes are more of a luxury item than a necessity to travel. Motorbikes maybe easy to travel in heavy traffic and consume less gasoline compared to a car. If a consumer choses a motorbike for the above mentioned reasons, it would be more reasonable to buy a lighter motorbike, which would be easier to handle and fuel efficient than a heavyweight motorcycle. The most profound complement for a heavyweight motorbike is gasoline/petrol. If fuel prices were higher consumers would not consider purchasing a heavyweight bike, because most journeys taken by the bike on such a bike is highly discretionary and will be used for pleasure rather than for transport necessities. Nevertheless, most of the heavyweight bike consumers are willing to pay between $8000 and $30,000 for this luxury vehicle, they would not mind paying just a little extra for fuel. Bargaining Power of Suppliers According to Melief, Bundgaard & Hathaway (2006), â€Å"Harley Davidson operates nearly every stage of the production of a motorcycle, taking raw materials such as steel and basic electrical components and shipping completed motorcycles to its extensive independent dealership network. Because there are many suppliers of all inputs that Harley Davidson requires for its manufacturing operations there is very little that any single supplier can do the exact rents from Harley. † This phrase proves that even if one supplier tries to escalate its profits/prices it would not be much of a deal for Harley to switch suppliers without interruption in production. â€Å"Preferred suppliers† approach reduced the number of suppliers Harley Davidson worked with and improved the quality of the suppliers as well; these long-term contracts and relationship protected Harley Davidson from supplier price increase. (NCCU, 2012) This also grew trust between the suppliers and Harley and their suppliers gained more profit as Harley improved their business. Bargaining Power of Consumers Similar to the Suppliers, Harley Davidson’s customers are of large population of individual consumers, making it difficult to badly affect Harley Davidson’s financial situation by refusing to corporate. (Melief, Bundgaard & Hathaway 2006) Even though Harley’s dealerships are individually owned and operated the companies’ customers are officially their licensed dealers. But the sheer number of dealers that Harley has all over the world makes situation for dealers not much better than individual riders. Harley needs their customers to buy the product in order to gain profit; since Harley is aging they also need to gain more new loyal riders. Each Harley Davidson purchase is by an individual; even though one person would not drastically affect the financial earnings of the company it is essential to sell the individual experience to each customer to reach more Markets and combine these sales to improve financial strength. (NCCU, 2012).

A Depiction Of Berlin In Robert Walser’s “Berlin Stories” and Walter Benjamin’s “Berlin Childhood Around 1900”

A Depiction Of Berlin In Robert Walser’s â€Å"Berlin Stories† and Walter Benjamin’s â€Å"Berlin Childhood Around 1900† Robert Walser’s â€Å"Berlin Stories† is a collection of vignettes that track his observation during his jaunts through the city. Walter Benjamin’s â€Å"Berlin Childhood Around 1900† is an attempt by Benjamin to recollect his urban childhood as an adult in exile. They both write about Berlin at the turn of the century but are able to produce images of the city that are at once captivating in their portrayal of a city in constant movement and honest in their dealings with the realities of modern life. In presenting Berlin as both a voluptuous giantess and a protective mother, the authors show that modernity can be both sensual and nurturing. In Walser’s â€Å"Good Morning, Giantess!† the titular figure is the city of Berlin: â€Å"The chest expands, the giantess Metropolis has just, with the most voluptuous leisureliness, pulled on her sun-shimmery chemise. A giantess like this doesn’t dress so quickly, but each of her beautiful, huge motions is fragrant and steams and pounds and peals.† (Walser 5) By likening Berlin to a giantess, Walser merges images of power and sexuality. The city steams and pounds and peals† but also expands its chest with a â€Å"voluptuous leisureliness.† Significantly, the giantess’ power is a mechanical power. Each of her motions â€Å"steams and pounds and peals,† invoking images of the modern factory, calling to mind Berlin’s namesake—Europe’s Fabrikstadt. Additionally, Walser points out that, â€Å"A giantess like this doesn’t dress so quickly.† The giantess Metropolis is slow and leisurely, and the language that Walser uses here even slows down the reader—â€Å"sun-shimmery chemise.† This language even extends to passages where Walser describes Berlin’s urban rush: â€Å"what a ravishing, beguiling haste can be seen in all this ostensible packed-in-ness and sober-mindedness† (11). By using sensuous language and a deliberate pace, Walser makes even Berlin’s hurriedness and crowdedness part of the city’s allure. However, Berlin, like a giantess, is frightening, even disgusting. Before the day breaks, â€Å"before even the electric trams are running,† Berlin is not a giantess, but a monster (3). Placing the reader in Berlin’s cold, early morning streets, Walser writes, â€Å"you trot along, rubbing your hands, and watch people coming out of the gates and doorways of their buildings, as though some impatient monster were spewing out warm, flaming saliva† (3). This disgusting image of a salivating monster deviates sharply from the image of a luxurious giantess slowly pulling on her chemise. This is because Walser is showing the reader the â€Å"dark side† of Berlin: the class divide. The people â€Å"coming out of the gates and doorways of their buildings† are lower class workers or, as Walser puts it, â€Å"people of no significance† (4). Walser contrasts these people with Berlin’s upper class, namely, â€Å"refined persons who make it a habit to arise late† and â€Å"the children of wealthy, beautiful parents† who are still asleep as the hoi polloi make their morning commute. Alternatively, in Benjamin’s â€Å"Berlin Childhood Around 1900† the city of Berlin acts as a surrogate mother. Benjamin calls the loggias in which he grew up while living in Berlin â€Å"the cradle in which the city laid its new citizen† (Benjamin 38). By merging images of Berlin with images of maternity, Benjamin introduces the city as a nurturer and protector. By carrying over images of maternity to a city as urban as Berlin, Benjamin is showing how memories of his Berlin childhood can be just as tender and innocent as â€Å"memories of a childhood spent in the country† (38). According to Benjamin, â€Å"The rhythm of the metropolitan railway and of carpet-beating rocked me to sleep,† and this imagery demonstrates Berlin’s ability to â€Å"nurse† young Benjamin in spite of its urban technology and elbow-to-elbow housing arrangements. Overall, Benjamin attempts to forge an image of the city that is nurturing and protective, despite i ts lack of rolling fields and lowing cattle. The juxtaposition of maternity and technology occurs later in the text when Benjamin describes the household telephone: â€Å"The night from which [the noises of the telephone] came was the one that precedes every true birth. And the voice that slumbered in those instruments was a newborn voice. Each day and every hour, the telephone was my twin brother.† (48) Here the reader encounters a young child’s wonder at modern technology, but, interestingly, Benjamin illustrates this by invoking images of maternity. Benjamin ascribes to the ring of the telephone the life-giving function which gives birth to both the voices on the other end of the phone call and young Benjamin himself. In other words, the telephone brings life into the home but also calls everyone within earshot of its ring into existence. However, in 1900, the German countryside had virtually no telephones while in Berlin these same devices were commonplace in middleclass family homes. By extending the maternal, life-giving language to the city’s technology, Benjamin establishing Berlin and its modernity as a city full of life. However, besides its ability to give life, the telephone also â€Å"multipl[ies] the terrors of the Berlin household† (49). The language that Benjamin uses to describe himself working up the courage to answer the phone as a child is fraught with violence and fear. According to Benjamin, â€Å"There was nothing to allay the violence with which [the telephone] pierced me,† shifting the image of the telephone from life-giver to violent penetrator (50). Earlier, Benjamin described the way the telephone slowly conquered his home, moving from a â€Å"dark hallway in the back of the house† to the front room, and now the phone has become a violating and intrusive presence (48). In this way, Benjamin paints an image of a modern childhood in an urban city that is nurturing and full of life but also filled with violence and fear in the form of technology. Between Robert Walser’s â€Å"Berlin Stories† and Walter Benjamin’s â€Å"Berlin Childhood Around 1900,† Berlin becomes both a voluptuous giantess and a nurturing mother. Berlin as giantess paints an image of the city that is sensual and leisurely, and Berlin as mother establishes the city as protective and life-giving. Of course, Berlin is far from a utopia, but these images transform what was at the turn of the city a dirty, overcrowded, and in many ways ugly city into a place that both of these authors is able to present proudly and lovingly to the reader.

Disorders of Red Cells Case Study Example | Topics and Well Written Essays - 750 words - 1

Disorders of Red Cells - Case Study Example It is quite clear that the patient is anemic. Usual signs and symptoms of anemia are lower hemoglobin and hematocrit levels, and reduced blood cell count causing fatigue, shortness of breath, hypotension, dizziness, headaches, and irritability. The condition eventually leads to tachycardia (the heart rate exceeding normal range) and tachypnea (breathing rate over 20) in due course of time. The hematocrit indicates about the volume of red blood cells in proportion to the total blood volume (total of plasma and red blood cells) and for women, it has to be between 36 and 48% (Eckman, 2013). The laboratory reading of the patients hematocrit has been shown 32% that is certainly less than the normal level. Moreover, the patients blood smear test reveals microcytic and hypochromic cells in her blood. This gives an indication of Microcytic Hypochromic Anemia in the patient. Usually, iron deficiency is the cause of hypochromic microcytic anemia. Microcytic Hypochromic anemia results when "a r educed amount of iron is delivered to the marrow erythroid precursors" (Eckman, 2013). Usually, efficient recycling of iron or a good balance maintained between losses and absorption keeps iron deficiency in control. It is estimated that a menstruating female loses approximately 2.0 mg of iron per day (Eckman, 2013). Ms. A’s age is 26 years and being in menstruating age, her iron losses are likely to be around 2.0 mg of iron per day. Her intake of iron appears to be not adequate enough to maintain losses or otherwise, the underlying cause of low hemoglobin lies somewhere else. Ms. As reticulocyte count (immature blood cells) makes up a higher percentage of the blood count and that appears to be due to low hemoglobin in red blood cells. A reticulocyte count is a blood test that reveals how fast bone marrow makes and releases red blood cells into the  blood.  

Discussion Board Question Assignment Example | Topics and Well Written Essays - 250 words - 2

Discussion Board Question - Assignment Example The policies before and after 1986 had a uniform naturalization rule of setting a residence requirement of two years. Policies were expanded for exclusion and deportation of subversives whereby all aliens had to report their address every year. In 1988, a mandate was made to increase border patrol agents. The agents increased by twice as much by 2004. Also, there was provision to enhance national and border security by increasing border fencing, surveillance and detainment of unauthorized border crossing. Religion has influenced me in such a way that I am now able to work and get along with other people. Religion has enabled me to avoid engaging in unhealthy activities such as drug abuse. People are reluctant to talk about religion because some individuals have mystical experiences whereby, they tend to think that their relationship with religion is intimate and should not be divulged to others (Schaefer, 2011). Religion reflects conservative and liberal positions on social issues as it describes people’s views. For example, the conservative rules describe views of various Christians on specific issues unlike liberalism. Another example is that liberalism can support homosexuality in a society while conservative religion can reject

Discussion Board Essay Example | Topics and Well Written Essays - 500 words - 3

Discussion Board - Essay Example Internet has emerged as the conveyer of leadership, synchronizer of teamwork, and facilitator of communication. Rapid networking has integrated most of the managerial and communication processes in and around the organization. No doubt, Internet has thus expanded the scope of organizational behavior manifold. (Nelson and Quick, 2007) In this context, the example of ObWeb can be readily furnished, which is an entire website dedicated to the cause of organizational behavior. The website serves two main purposes: First, it helps thought sharing, communication, and research in the field of organizational behavior. Second, it strengthens the organizational behaviorist patterns of the academics and professionals by serving as an interactive social media platform. Hence, the web portal provides a forum for the members to ask questions, get answers, post announcements, and engage in a dialogue to address the issues related to organizational behavior. (Leana, 2010) Internet is perhaps one of the strongest tools of information technology (IT). Internet has enabled us to access huge amounts of data, communicate with each other across thousands of miles, and facilitate trans-platform integration of different technologies like email, ecommerce, etc. However, in regards of organizational behavior, the potential effects of IT and Internet are not uniformly positive. Organizations that rely on sophisticated information technologies are more vulnerable to vandalism, espionage, and sabotage. Moreover, IT can create new social divisions. For example, the computer savvy may be put vis-Ã  -vis the nonuser and the educated may dominate the uneducated in newer ways. Faster ways to communicate through the Internet cannot substitute the critical human qualities like common sense and good judgment. Rather, too many channels of communication may lead to contradictions and confusion. Hence, advent of Internet has introduced new problems related to network

How is the technologically mediated behavior driven by the low Essay

How is the technologically mediated behavior driven by the low fidelity public soundscape - Essay Example It is evident from the study that the idea of a public soundscape for instance, has only turn out to be important over the past few centuries, as sealed and enfolded buildings turned out to be more common. Previous to completely enfolded buildings, sound flowed mainly unrestrained from the private ball to the public, and vice versa which destined that, two persons in close proximity to each other experienced an analogous soundscape, despite of whether they occurred to be in the private or public realm. â€Å"R. Murray Schafer, one of the early pioneers of the study of soundscapes indicates that the rise of life spent primarily indoors gave way to two enduring phenomenon: the high art of music, and noise pollution† (Neudorf 3). The events of public soundscapes keep on developing in the current period of mobile phones and moveable music instruments. Nowadays it is possible, certainly general, to build ‘semi- private’ soundscapes (by way of make use of movable device of music and mobile phones) in public spaces, which highly block soundscapes in public. The idea of soundscape which represents a spatial implication no longer appears to fit in this circumstance; ‘sound experience’ may be a more suitable word given to the rising disconnect among site and audio perception. Second difference can be made among soundscapes in densely inhabited (urban) places and soundscapes in places that are less impacted by the activity of the persons. The density of the sound normally reflects the population compactness of the human being. However, there are numerous exemptions, where in high compactness places, sounds must contend  with each other with the intention to be heard. And also at the same time, sounds originate by human beings and their particular activities normally dominate urban soundscapes, as natural sounds hardly ever adjust to a louder soundscapes by raising their volume. Soundscapes, which are not conquered by activity of the huma n being, may have more moderate and reasonable, but they are distant (far) from unfilled. Even urban soundscapes which may not provide wealthy and rich environmental habitats frequently consist of impressive sounds.  Research method used to conduct the study is the primary research method. Primary research method used to acquire most authentic data directly from respondent. It is include survey method, interview method and Questionnaire Survey.   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   There is a certain kind of risk in adopting the word soundscape which has a clear etymological debt to its progenitor landscape that a variety of suggestions from the visual world will also be adopted into the audio realm. Schafer builds the perceptive examination that unlike landscapes; soundscapes are concerning various activities and actions, not artifacts. In view of the fact that soundscapes are based on these activities, they are intrinsically unique at any of the specified point in time and space. â€Å"Scha fer suggests that there are two ways to improve the soundscape. The first is to increase sonological competence through an education program that attempts to imbue new generations with an appreciation of environmental sound. This he believes will foster a new approach to design - the second way - that will incorporate an appreciation of sound and thus reduce the wasted energy that noise represents† (Wrightson & Gil par. 24). Differentiation between Private and Public Soundscapes:   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   A soundscape is a kind of sound or amalgamation of sounds that shapes or occurs from an immersive

A restaurant chain Essay Example | Topics and Well Written Essays - 1500 words

A restaurant chain - Essay Example Another important source of its revenue includes profits earned from its operated restaurants. In the year 2011, the company was able to make a profit of 5.5 billion dollars, and this amounted to annual revenue of 27.5 billion dollars2. The primary business line of McDonalds includes cheeseburgers, milkshakes, desserts, soft drinks, French fries, cheeseburgers, etc. Recently, the business performance of McDonalds has been falling down, reporting a negative growth in its markets, and revenues. For example, in the year 2014, the business performance of McDonalds in Europe and America experienced a slow down3. In Europe, the company posted a negative drop of its financial performance by 1.4%. This is despite depicting a strong financial performance in its UK market. In United States, the company was able to post a drop of its sales by 1%. Another problem facing this company is its weak and inefficient customer service capability4. The company employees are not good at catering for the needs of its customers, and this has an impact in affect the loyalty of the customers towards the business organization. In any organization, employees of the company play an important role in determining whether the company will succeed or not. An efficient and friendly workforce would ensure that they are able to know and serve the needs of its customers, and this is the key to increasing the market share of an organization5. For purposes of improving its financial performance, the management of the company has to solve the above mentioned problems. There are two major methods that the company can use to solve the mentioned problems, and they include, improving its marketing strategy and its customer service capability. However, the company cannot develop an efficient marketing strategy, without having information on the strategies of their competitors, and the needs of its customers. This would therefore force the company to

Case-note on R (onthe application of Nicklinson) v Ministry of Justice Essay

Case-note on R (onthe application of Nicklinson) v Ministry of Justice [2014] UKSC 38 - Essay Example such a case, autonomy refers to the capability and right to make a personal choice, and as such, in most circumstances people always act in denial of the legitimacy of choices especially in situations whereby there is a militate against autonomy1. A specific example applicable in such a case is the voluntary entry by an individual into drug addiction, or into slavery. Consequently, when one chooses suicide, he or she chooses not to be in a position to make any more choices. However, it is imperative to note that the choice of suicide is defendable before the courts of law. Nevertheless, the main argument that the choice of suicide in some cases promotes autonomy does not fit to enlist in the favour of the same because suicide still stands out as a course of death. Through this judgement, the Supreme Court of the United Kingdom substantially advanced the cause of individuals in the country who are keen on putting an end to their lives in a humane manner. In addition, it also created a precedent for other cases as a leading judgement within incompatibility declarations in the appreciation margin of the United Kingdom. Tony Nicklinson, the key player in this case, wanted to put an end to his life after getting tired of his illness which had paralysed him almost completely after he suffered a catastrophic stroke. However, the bone of contention in this case was that Nicklinson health condition could not permit him to end his life on his own. As such, his physical incapacity demanded that he seeks the help of another person in putting an end to his life, since he could not perform it without receiving help from other people except through self-starvation. Therefore, Nicklinson wished to receive assistance from others in order to commit his proposed suicide. Nevertheless, section 2 of the 1961 Suicide Act stood in the way of other people coming to his help to aid him commit suicide lawfully2. The suicide act says that an individual, â€Å"D† commits a legal offense

The strength of an electromagnet Essay Example for Free

The strength of an electromagnet Essay Mass of iron filings attracted in grams (g) dciana, please do not redistribute this coursework. We work very hard to create this website, and we trust our visitors to respect it for the good of other students. Please, do not circulate this coursework elsewhere on the internet. Anybody found doing so will be permanently banned. 0. 0185 This work from www. studentcentral. co. uk 0. 0190 HV6 from HV6 coursewrok HV6 work HV6 info HV6 0. 0185cofa far sefafaw orfa fak infa fofa fa! Mass of iron filings attracted in grams (g)codc dcr sedcdcw ordc dck indc fodc dc. 0.0185 Weber refuted dcianas rationalisation hypothesis. 0. 0175coeb ebr seebebw oreb ebk ineb foeb eb. 0. 0180coca car secacaw orca cak inca foca ca. Mass of iron filings attracted in grams (g)coaa aar seaaaaw oraa aak inaa foaa aa. 0. 0185coac acr seacacw orac ack inac foac ac; 0. 0190 This dissertation from www. studentcentral. co. uk 0. 0180cobg bgr sebgbgw orbg bgk inbg fobg bg. Average Mass of Iron filings in grams (g) dciana, please do not redistribute this paper. We work very hard to create this website, and we trust our visitors to respect it for the good of other students. Please, do not circulate this paper elsewhere on the internet. Anybody found doing so will be permanently banned. 0. 0187 dciana, please do not redistribute this dissertation. We work very hard to create this website, and we trust our visitors to respect it for the good of other students. Please, do not circulate this dissertation elsewhere on the internet. Anybody found doing so will be permanently banned. 0. 0187 This dissertation from www. studentcentral. co. uk 0. 0185 xRbb Visit coursework ef in ef fo ef for ef more project ef Do ef not ef redistribute xRbb Average Current in Amps (A) nX6ehKf5 Visit coursework cc in cc fo cc for cc more paper cc Do cc not cc redistribute nX6ehKf5 2+coce cer sececew orce cek ince foce ce; 2+ FUZlDg from FUZlDg coursewrok FUZlDg work FUZlDg info FUZlDg 2+coed edr seededw ored edk ined foed ed; Average Voltage in Volts (V) NTBfPtDXg from NTBfPtDXg coursewrok NTBfPtDXg work NTBfPtDXg info NTBfPtDXg 3cogd gdr segdgdw orgd gdk ingd fogd gd; 3coca car secacaw orca cak inca foca ca. 3 P5zpmk from P5zpmk coursewrok P5zpmk work P5zpmk info P5zpmk Graphs: This hypothesis from www. studentcentral. co. uk Fig 1. 5 Fig 1. 6 DKREDG7nc Visit coursework db in db fo db for db more cours db Do db not db redistribute DKREDG7nc Conclusion: hFxX4CVX Visit coursework fa in fa fo fa for fa more work fa Do fa not fa redistribute hFxX4CVX From the results obtained in this experiment, it becomes very clear that changing the positioning of the solenoid on the iron core has no effect on the electromagnets strength. This is because from Fig 1. 4, 1. 5 and 1. 6 the results show that there is hardly any significant change in the results. However when the solenoid is placed on the right hand side of iron core there is a slight change of 0. 0002 grams of iron filing collected in comparison to the other two positions (middle and left hand side) but this change is quite insignificant. The voltage also remained the same throughout all the nine experiments (as expected) and was measured with a voltmeter since the power supply was set to 3 volts at all times and therefore was anyway a constant (the voltage was measured with a voltmeter eventhough it wasnt really needed because the power supply was set to 3V). From the results that were obtained for current a conclusion could not be drawn and there for it is difficult to say anything about current in this specific experiment. There was one set of results (Fig 1. 4, Right hand side position) that was slightly anomalic (0. 0002g) in comparison to the other results but this will be later on analysed in the evaluation. Weber suppressed dcianas functionalism . I can conclude by saying that my hypothesis was correct since the results (except for current in Amps) received were as I thought they would be. dciana, please do not redistribute this project. We work very hard to create this website, and we trust our visitors to respect it for the good of other students. Please, do not circulate this project elsewhere on the internet. Anybody found doing so will be permanently banned. Evaluation:coee eer seeeeew oree eek inee foee ee. As in most of the experiments there are always a few improvements that can be made to get even better and more reliable results than the ones obtained from the previous one. The first factor in this experiment that could be improved is that of the ammeter readings, since the ammeter that was used was first of all not digital and only went up to 2 amps (however for this experiment we were looking at a greater current than just 2 amps). So either a potentiometer /variable resistor (to decrease the current) or a digital ammeter could be used, which would display higher currents than just 2 amps. The second factor in this experiment that could be improved would be that of the coiling of the wire around the metal coil because the wires were supposed to be tightly wrapped around the coil so there would be a 1 mm space between the wires (the solenoid was made up of 25 loops of insulated wire). Not following this factor was the reason for slight anomalic results (see Fig 1. 5) between the positions middle and right plus left and right because for the two sides (middle and left) one partner looped the wires around the metal core and for the other side (right) the second partner looped the wires around (obviously differently than the first partner) the metal core. The third factor that could be improved in this experiment would be that of the tape (to keep the solenoid in place), since this could have been measured (e. g. 4cm per experiment) because in this experiment the tape was not measured and therefore became an uncontrolled variable. It is very difficult to say whether the last positions (right) results were anomalic because of the third factor or simply because the balance might have been reset incorrectly since the difference between the right hand side position and the other two positions (middle and left) was just 0. 0002 grams. If this experiment was to be done again then it would a good idea to have a closer look at the three factors mentioned above.cogc gcr segcgcw orgc gck ingc fogc gc; Altogether this was a successful experiment because not only was the aim met but also the hypothesis was proved to be correct and most of the results were also reliable except for perhaps that one set mentioned above. coce cer sececew orce cek ince foce ce; Bibliography: fo ea fGCSE Double Science Physics Book The Revision Guideor ea more dissertation ea Do ea not ea redistribute mqR8F15 I would like to acknowledge this book in helping me with scientific evidentiary support.

History and Marketing Strategy of Apple Inc

History and Marketing Strategy of Apple Inc History and background of the company: The history and the back ground of Apple Inc which used to be Apple Computers, Inc when they first started in California USA and become a multinational company which started from scratch. Apple Inc mainly deal with consumer electronics, computer software and commercial servers. Apples most famous products are iPhone, iPod and Macintosh computers. Apple was formed by Steven Paul Jobs 21 and Stephen Gary Wozniak 25, they created a first Apple computer on 1st April 1976 named Apple I. Apple was incorporated in 1977 in California (Apple website, FAQ). For about 20 year Apple computers Inc was predominantly a manufacturer of personal computers that includes Power Mac, Apple I, Apple II, Apple III and Macintosh lines but also faced unstable sales and low market shares. Steven Job resign the company in 1985 due to infighting and he rejoin in 1996 as a CEO of the company. He brought with him a new corporate philosophy of identifiable product and simple design. Introducing a great success of iPod music player in 2001, Apple become a leader in consumer electronic industry, dropping computer from its name and keeping on to release the iPad and iPhone. And in present Apple is one of the biggest technology company in the world, with the revenue of over $60 billion per annum[ Hormby Thomas, A history of Apples Lisa, 1979-1986, Low End Mac, 6th October 2005] [Apple website]. Strategy and Implementation Philosophy of identifiable product and simple design help Apple maintain their growth in early 80s and a huge part of success is due to its leadership in the education sector, which was one of the brilliant business strategy, education environment provided Apple with a great amount of loyal users around the world. They started targeting into education sector in Cupertino California by a very important agreement between Steve Job and Jim Baroux of (LCSI) Logo Computer Systems Inc, which was an agreement to donate one Apple II and one Apple LOGO software package to every public school in Texas. The idea was great and the philosophy behind that was that if they donate one package to each school then this would result in thirty more packages to sell, which is estimated as the number of students in one classroom at least and ofcourse some more purchases are possible from parents who wants to support the technology to make their children to stay aware of technology, learn more and get fami liar. This significant agreement between Apple Inc and Logo Computer System Inc (LCSI) was a great success though out the State, which establish a very strong and constant presence for Apple in the schools throughout California. This become Apple IIs era in schools right across the United States and the leadership of Apple in education sector around the world continues in the most critical time of 1980s. Therefore Apple made it extremely well in education sector as well as in the families, as parents carry on supporting the learning experience for their children after school [Wikipedia, Article, Apple Inc]. Technology used and Product/Services: Apple Inc mainly deal with consumer electronics, computer software and commercial servers. Apple is an example of itself when comes to technology, the technology they introduce since they first launched and until today. Although there was issues in some software they introduced as well as their Operating system that it is not users friendly but Apple keep identifying the issue efficiently and effectively, for example using Microsofts Power point compare to Apples keynote which takes powerPoint apart and figures out how the files work that makes it more user friendly [Bill Thompson, 19th Sep 2007, BBC News]. They are famous to introduce the best touch sensor in their products which includes Mac, iPhone, iPod and iPad recently, best example is iPhone which is still the leader in smart phone technology and introduced the best touch screen system in the market so far. Apple have introduced various operating system for its products like Macintosh, PowerBook, iPod, iPad and iPhone. Apple always use their own Operating system in all of their products, one of the most famous operating system is iOS which is used in iPhone and OS X, Mac OS X is the worlds most advanced operating system. Built on UNIX foundation and designed simple as of this is one of the fundamentals of the company. This is why Mac have a reputation of innovative, compatible, highly secure and user friendly [Apple website, Mac OS X, Over view]. OS X series includes Snow Leopard which was unveiled on 8th of June 2009 and was available to purchase in Cupertino, California and on their website and by 28th of August 2009 in the market throughout the world [Apple website, library, Mac OS Snow Leopard]. Mac OS X Versions are Mac OS X Server 1.0, Public Beta, then from 10.0 to the Latest version is Mac OS X v10.6 Snow Leopard and 10.7 Lion announced on 20th of October 2010 and expected to release by 2011. Apple have also introduces digital cameras, portable CD audio players, speakers, video consoles and TV appliances [Wikipedia, Apple Inc, Mac OS X]. The main markets where Apple operates: Apple is a multinational company based in Cupertino, California and their product sales in more than 50 countries, one of the most recent successful product of Apple is iPhone, it is available in over 50 countries and more to be added in their network later and Apple iPhones are making their production company to increase their yearly products because the of their extreme success and they are selling it very well indeed and iPhones are increasing their market share day by day and quit fast. [Amit Bhawani, Information guide, Apple inc, smart phone launch, vodaphone] As the graph shows, their main markets where they operates are USA, Japan, Germany, France, Spain, Canada and UK, over all they are doing very well in Europe and USA itself, besides that they are also in Mexico, Netherland, Sweden, Austria, Finland, Italy, Belgium, Portugal, Switzerland, Denmark, Ireland, New Zealand, Hong Kong and now in India as well. Success of iPhone is a great boom to Apple Inc. Main Products and Ethical challenges: Apples worldwide smartphone shares boost upto 17% due to iPhone sales reached 7 million in 2009 including the continued version of iPhone 3GS and they are expected to be more because later in the same year they started selling iPhones in China, where as Chinese made a copy version of iPhone with different software but unable to beat the original one ofcourse. [Website Mac Rumors, News, Smartphone market worldwide] Worldwide mobile phone market experienced less growth as compare to their early years and in this year the growth was as low as 0.1 percent but smartphones was continuously growing their success and performance and growing their market upto 12.8 percent nearly every year. They face great competitors like Microsoft which is focusing on delivering software to cheap product personal computers while Apple delivers rich engineered products. Apple relied on high profit margins and never developed a clear response. Other competitors are IBM and Dell which are famous about their durability and have a good reputation in making computers. Product and Business Portfolio : Product portfolio plays important role in companys business success especially when come to competition. Product portfolio is to capture and understand customers need according to the market. Apples portfolio is to transform their customers into specifications of the product they are offerings. There has been criticism on iPhone and iPod that these devices has been locked/restricted into iTones and creating iTone Store monopoly but Apple keep ensuring that anyone but their product will be completely locked/restricted to an Apples created world. This portfolio keep the other competitors out in some aspects but is also become hard to justify some measures when creating a circle around the customers and keep competitors out. Although the fact that iTunes database format has already been cracked and the third party tool have been updated, example application like cydia which unlock iPhone and enable customers to download various applications and allow them to use their iPhone for all the network providers. But Apple is spending more time trying to ensure that anyone who purchase their product must completely locked in to Apple-centred world in which they use iTones for products like iPod and iPhone, buy from iTones Music store, and purchese only Apple-certified accessories. The new version of iTunes break the fix and they keep updating the versions of iPhone and iPod to lock the customers and other updated and therefore no third party tool is able to unlock the version unless it is certified by Apple itself [Bill Thompson, 2007, BBC News, Article in Technology section]. Corporate Change and Social welfare of employee: Apple was one of the highest successful companies founded in 70s, Corporate philosophy of identifiable product and simple design which was introduced by Steve Jobs. Apple cares about their employees and provide them various facilities and benefits that includes, staff discount, paid holidays, maternity leaves, annual bonus and friendly and learning environment. Quality: Apples relies on best quality for their customers as of their product is design to provide the best output, high profile and highly priced due to their basic strategy of high profit margin on each product and keeping their market stable. They launch the best quality product and improvise it in later versions as required by their customers. They also manage to maintain their product quality with their corporate philosophy of identifiable product and simple design.