Economic and Business Context Essay Example | Topics and Well Written Essays - 2000 words

Economic and Business Context - Essay Example in 1894 in Manchester, after wards Marks entered in to partnership with Thomas Spencer, and they established a company known as Marks & Spencer (M & S). In the initial time the company only concentrates in the area of selling of goods they are purchased the goods from wholesalers and other intermediteries after they established a good market base in UK they entered another area of business. Marks & Spencer became a limited company after adopting revolutionary policy of buying directly from manufacturers. In 1926 they stepped in textile industry. It is mainly concentrating on the selling of British produced goods for the purposes of maintaining cordial relation with British manufacturers by maintaining a new brand named ‘St Michael’ mainly they market clothing and Food products. The key factor behind their success is the motto of providing better customer service relation, by accepting unwanted goods from their customer and refunding the cash. The company tries to provide only quality goods by maintaining their reputation for offering fair value for money. In 1988 the company acquired Brooks Brothers an American clothing company and Kings Supermarket a food chain. Currently the company expands and diverse their business activities in the area of Food retail stores and Home ware retailing also. They are mainly marketing the clothing products through their retail outlets. â€Å"Marks & Spencer, leading international departmental, has drawn up ambitious expansion plans in India and China starting as early as next year, its chief executive Stuart Rose has said.† (Marks & Spencer plans to expand in India, china, 2007). The company also launched a web site for the purpose of online marketing system associated with Amazon.com. Marks & Spencer’s better customer service and quality products will helps them to improve their business in the area of online marketing also. â€Å"For years customer service has been a fundamental part of consumers offline shopping

An Equal Opportunity for Minorities Essay Example | Topics and Well Written Essays - 500 words

An Equal Opportunity for Minorities - Essay Example This is what some minorities actually receive in most of our communities. Recognizing the hazard that this brings such as violence and rebellion both to the minorities and to the native Americans, the government and other citizens have taken initiative to abate this problem. Since these immigrants have come to the US soil with much dream and aspiration, they have proven to be more of an asset to the government, with 40% of our scientists coming from this group. The minorities proved to be a potent part of our nation's economy. Realizing this potential, the government desire to give them equal educational opportunities with the native Americans. Giving equal education opportunities for minorities will increase the quality of our labor force, thereby increasing over-all production in the country. these people represent a considerable percentage of the people that we depend on for our political and economic soundness. This paper wishes to look at how the American education system is changing with the influx of foreigners in the country. This report aims to look at the specific adaptation schemes done by the government to take into account this demographic change. We particularly focus on the government and non-government institutions that provide education opportunities to the minorities. We

Revenue management Assignment Example | Topics and Well Written Essays - 500 words - 1

Revenue management - Assignment Example Therefore, by 2020, it is projected that there will be a shift in landscape in RM. To ensure the success of RM strategies, the revenue managers in the hospitality industry need to be convinced of the ability to deliver return on investment and made aware of the resources needed to maximize potential. The hotels should also make sure that their organizational structure supports the RM policy. Besides, there needs to be a cultural understanding which major department like sales, marketing, and revenue work together to share information crucial to revenue management success. Furthermore, it is forecasted that the application of RM will become more strategic and will be supported by the increasingly sophisticated technology. This is because it includes more of income streams of the hotel. In this regard, by 2020, revenue management is likely to be applied to function-space and also incorporate revenue streams including restaurants and spas, as well as golf courses. Consequently, the RM function will become more central to operations of the hotel, and will quite to be expected be a separate department under supervision of the general manager. The core, strategic role of revenue management will need upgraded measurement techniques (Hayes and Miller 55-68). This implies that other than revenue per available room (RevPAR), the future RM might have a profit-oriented metric, for instance, total revenue per available room or the gross operating profit per available room (GOPPAR). As for the future revenue managers, they will require analytical, leadership, and communication skills. A formal RM education as well as negotiation skills would also be helpful. According to (Nessler 86), the managers would also use tools or internal compression which will aid them establish the unconstrained demand and close out close non-profitable channels. Since RM will move from tactical to a more strategic role, analytics along with supporting technology will play a crucial role in

An Equal Opportunity for Minorities Essay Example | Topics and Well Written Essays - 500 words

An Equal Opportunity for Minorities - Essay Example This is what some minorities actually receive in most of our communities. Recognizing the hazard that this brings such as violence and rebellion both to the minorities and to the native Americans, the government and other citizens have taken initiative to abate this problem. Since these immigrants have come to the US soil with much dream and aspiration, they have proven to be more of an asset to the government, with 40% of our scientists coming from this group. The minorities proved to be a potent part of our nation's economy. Realizing this potential, the government desire to give them equal educational opportunities with the native Americans. Giving equal education opportunities for minorities will increase the quality of our labor force, thereby increasing over-all production in the country. these people represent a considerable percentage of the people that we depend on for our political and economic soundness. This paper wishes to look at how the American education system is changing with the influx of foreigners in the country. This report aims to look at the specific adaptation schemes done by the government to take into account this demographic change. We particularly focus on the government and non-government institutions that provide education opportunities to the minorities. We

Work Specialization techniqu. Advantages and drawbacks Essay

Work Specialization techniqu. Advantages and drawbacks - Essay Example The topic under focus here is Work Specialization. It is one of the key elements to consider while devising a structure for one’s organization. Work specialization is defined as the extent till which work that needs to be done to achieve organizational goals is broken down into smaller manageable chunks of tasks. Most organizations might collapse without specialization because it is merely impossible for everyone to know everything and possess all the necessary skills needed to run the whole organization. It is the process that breaks down the big goals into small parts and then each part is assigned to one individual according to his/her skills set. These workers specialize in performing the assigned activity possessing the skills they already had. It is the approach by which the skills of a particular employee can be utilized at the best. The work is performed in repetition which also makes the employee more experienced with it reducing chances of error and hence caters to t he smooth functioning of the entire organization leading to the ultimate goal.

Philosophy Notes on Kant Essay Example for Free

Philosophy Notes on Kant Essay Morality is entirely determined by what someone wills because a good will is the only thing that is good with out provocations. Every other character trait is only morally good once we qualify it as such. Kant morality is all about what someone wills and not about the end result or consequence is. Someone can be happy but for immoral reasons. Kant it is really the thought that counts. Motivation is everything. What does Bentham and Mills look at consequences and happiness. Kant thinks of these things as matter of riddle in the game of morality. Think of it this way. If we think of someone as our favorite moral hero in past and present because of the various things they did, accomplish, brought about. All you are doing when you admire such people is judging results. What we see. But if we are really judging moral worth on what we see we are then failing to adjudicate moral worth entirely. After all we have no idea what the shop clerks real motives are. Perhaps she is honest because she thinks this is the best way to make money. If this wasn’t her true motivation she may start ripping people off as soon as she could. Think back to what glaucon says. He says it is better to appear to be moral than to really be moral. Kant believes this is a much more comman way of going aobut things that it probably happens most of the time given that many people don’t have moral motivations that we really have no way of knowing what peopole’ motivations are. Perhaps Abraham Lincoln and MLK motivations were not stemmed form good will at all but only for honor, fame or fortune. We simply don’t know. Remember there are many people who were unlucky failed to bring any results even thought they hated good will or moral principles. They are forever unknown they are forever anonymous. He says we should stick to what pure reason tells and tells us it doesn’t care about consequences, doesn’t care about actions, doesn’t care about results. It cares about motivation. We can never tell anyone’s motivation just from look at them. Kant argues that if we look around the natural world that by in large things seem to fill their end for what they are designed for. Cheetahs usually have four legs and are good at catching prey. By and large, natural entities fulfill their designed purpose. Eyeballs are designed to see and usually do. Sure they eventually pucker out but for most part our eyes work how they were designed to function. But if we look at this larger thing called the human person and then assumed he was designed for happiness in the same way a cheetah was designed to run and catch prey and the eyes were designed to see we can conclude that the design of the human person were wrong. We can’t be designed for the purpose of being happy because if we were we would be a strange anomaly of nature. But why do we say this because we are species. We are a species that is defined by pain and suffering and anxiety and depression that results in misery. We are sad, miserable and pathetic. Unfortunately, argues Kant, we aren’t designed to be happy. The purpose of life isn’t to be happy! It is to be moral. Instead we are designed to be moral. Happiness may forever be out of reach but that’s ok because that is not the purpose of being human. The purpose of being human is to be moral and happiness may not have anything to do with each other. Kant’s theory is seen as deontological because it is all about duty. Kant argues that to be moral we have to consider duty compared to what we might want to do based on our emotions and inclinations. The name of the game is DUTY. We must be motivated by duty in order to be moral. Ex: if we only help out in a soup kitchen only because it makes us feel good then we aren’t properly moral. If happiness is your only motivation because once you stop feeling good about it you will quit working in the soup kitchen. You will burn out fast. Emotions can’t motivate. They can accompany but can’t motivate it. You can’t be motivated by sentiments or emotions. They aren’t moral or immoral. They are just†¦there. We can’t help them. In other words we are motivated to help because it’s your duty and you also like to help then that is all fine and good. Consider your enjoyment a nice bonus but a bonus that is entirely outside of the moral realm. Again difference on one hand being motivated by duty whilst liking it all the while and on the other hand being motivated only because you like it is this. If you are motivated by an emotion than once you cease having that emotion you will quit. The man who works in the soup kitchen only because it makes him feel good will immediately quit because he wants to feel good about it. It won’t take him long because it will be really stressful because it’s really smelly work. You have to deal with smelly people. If someone says if your heart isn’t in it then it is not worth doing. Kant would say this is total rubbish. You have no control over whether your heart will be in it or not. Do it because it is your duty. You only do it because of your rational or rationality. Morality is based on duty and that’s it. So how do figure out what duty is. Kant says we figure out to be what means to be the dutiful person by considering the act from pure reason alone and to get rid of emotion and sentiment. Duty stems from pure reason. Acting from sentiment and emotion is not properly rational. Kant wants to figure out what it means to be a rational, moral person. He does this by considering what pure reason is and pure reason is an aspect of the human person that is not particular to emotions or passions, or pathology or hormones or sentiments. For Kant, rationality is something that is much more pure. Something entirely bound up with nothing biological. Nothing evolutionary. Nothing emotional. Nothing empathetic. Kant would have been very much at home with the idea of the intergalactic senate. Lots of different sorts of biological beings with various physical attributes but all sharing in the same transcendental rationality attached to their particular alien biology. He would have been much more in line with Spocs decision making than captain kirk. Kant is spac. Most of us acting on emotion like Captain Kirk aren’t being truly ration and therefore aren’t truly being moral at least as far as Kant is concerned. To do the moral thing is to do that thing which is based on duty. We determine what our duty on what maxims can be universalized with out contradiction. We consider our duty via pure rationality and pure rationality tells us that one only acts morally if their actions are universalizable. Kant it is important to consider morality this way because this way we can make morality certain and self-evident. To say we act on a universalizable maxim is to say that a immoral action is precisely that action with is based on a maxim that can not be universalized with out contradiction. Thus, the reason you cannot steal is because to base ones action on stealing you would have to have one maxim that steal if you cannot afford to pay. But this creates a situation that cannot be universalized. If everyone stole if they cannot afford to pay then there would be no such thing as theft. This would destroy the very concept of legitimate theft. You would destroy the very concept of property and ownership making theft impossible. . You can only make sense of stealing most people don’t steal most of the time. Thus to act immorally is to count on everyone else or most of everyone else to follow a certain role precisely in order for you to get away with not following that rule. What holds for stealing also holds for lying. You can only get away with lying if most people don’t lie most of the time. To universalize lying would destroy the possibility of being able to tell a lie. Kant differentiates imperative based and hypotheses and imperatives that are categorical or come from pure reason. Hypothetical imperatives and categorical imperatives. Kant says that all imperatives are based on hypotheses that are not properly moral. That is that no action that is based on hypothesis that a certain thing will come about if a action is done can be properly be called a moral action. Thus for example if I base my example that I base my hypothesese that my action will result in a certain pleasure or emotion than it isn’t properly moral. Morality is not a means end rational thing in this way. It can’t be. Hypothetical imperatives. Precisely because it is only a hypothesis, we do not KNOW with certainty that a certain action will bring about a certain consequence. Morality must be based on some certain principles and all means are based on hypothesis. We think or hypothesize that doing a certain action will give us pleasure or happyness. Utilitarians act on a hypothetical imperative and this is because utilitarians are trying to get good consequences. The problem with this theory, says Kant, is that you are trying to bring about something that you might not have the foggiest clue how to bring about. Morality by contrast, says Kant, can’t be based on knowledge that you might not have. We don’t know for sure how to bring about happiness. We think we know if we pass a policy that it will bring about more jobs to stimulate the economy but we don’t know that for sure. Morality can’t be an experiment. It must be based on a set of principles or as Kant calls it the categorical imperative. That action which is at the same time is able to be a universal law. Categorical imperatives are based on the certainty that only pure reason gives us. Only categorical imperatives can bring us true morality. This stuff about law is important. In his theory everyone is a legislature of moral law. We are all moral legislature. Remember that Kant does not think we can discover facts out there in nature or by meditating on the forms like Plato thinks. He actually disagrees with Plato and Aristotle and agrees with the Utilitarians on this point where as these ancient thinkers say we discover moral facts on the nature of the good. Kant argues that we construct moral law from a rightly working from pure rationality like they did in the intergalactic senate. As rational agents we have the ability to construct moral law. We do not discover moral law. It is not part of the world. We create moral law, based on the logic of pure reason. Literally make it. But just because it is subjectively constructed doesn’t mean morality can’t be objective. If moral principles are based on categorical imperatives from maxims then the constructive moral laws are the same time objective. He concedes that morality is intersubjectively objective. That’s the name of the game to create laws that are intersujectively subjective. Even though morality is constructed, it is still objective. This is because you can only legislate—or create—morality one way: the way given to you by pure reason.

A Two Port Network Biology Essay

A Two Port Network Biology Essay A  two-port network  a kind of  four-terminal network  or quadripole is an  electrical network  circuit or device with two pairs  of terminals to connect to external circuits. Two terminals constitute a  port  if the currents applied to them satisfy the essential requirement known as the  port condition: the  electric current entering one terminal must equal the current emerging from the other. The ports constitute interfaces where the network connects to other networks, the points where signals are applied or outputs are taken. In a two-port network, often port 1 is considered the input port and port 2 is considered the output port. The two-port network model is used in mathematical  circuit analysis techniques to isolate portions of larger circuits. A two-port network is regarded as a black box with its properties specified by a  matrix  of numbers. This allows the response of the network to signals applied to the ports to be calculated easily, without solving for all the internal voltages and currents in the network. It also allows similar circuits or devices to be compared easily. For example, transistors are often regarded as two-ports, characterized by their h-parameters (see below) which are listed by the manufacturer. Any  linear circuit  with four terminals can be regarded as a two-port network provided that it does not contain an independent source and satisfies the port conditions. Examples of circuits analysed as two-ports are  filters,  matching networks,  transmission lines, transformers, and  small-signal models  for transistors (such as the  hybrid-pi model). The analysis of passive two-port networks is an outgrowth of  reciprocity theorems  first derived by Lorentz. In two-port mathematical models, the network is described by a 2 by 2 square matrix of  complex numbers. The common models that are used are referred to as  z-parameters,  y-parameters,  h-parameters,  g-parameters, and  ABCD-parameters, each described individually below. These are all limited to linear networks since an underlying assumption of their derivation is that any given circuit condition is a linear superposition of various short-circuit and open circuit conditions. They are usually expressed in matrix notation, and they establish relations between the variables (Two-Port Networks. (n.d.). In  Wikipedia. Retrieved October 25, 20012, from http://en.wikipe dia.org/wiki/Two-port_network) The experiment is divided into two parts: Part 1 is focused on determining two-port network parameters (admittance and transmission parameters only). The process of measurement and calculations will be briefly illustrated in Theoretical Supplement part. We are aiming to investigate the relationships between the individual parameters and the parameters of two-port networks in cascade and parallel. Part 2 is focused on finding out the transient responses in two-port networks containing capacitive and inductive reactances. Theoretical Supplements: Measurement of Admittance (Y-) Parameters: The equations to determine the parameters are: I1 = y11V1 + y12V2 I2 = y21V1 + y22V2 i.e. [I] = [Y].[V] [Y] = y11 y12 y21 y22 where are the Y parameters of the two-port network. Experimentally these parameters can be determined by short circuiting the ports, one at a time. Hence these parameters are also termed as short-circuit admittance parameters. The following diagrams show the method to calculate the parameters: When output port is shorted (as shown in Figure 2 below): V2 = 0.1 Figure 2 y11 = I1 / V1 y21 = I2 / V1 When input port is shorted (as shown in Figure 3 below): V1 = 0 2 Figure3 y12 = I1 / V2 y22 = I2 / V2 Measurement of Transmission Parameters: The equations to determine the parameters are: V1 = AV2 BI2 I1 = CV2 DI2 Or3 Where [t] is the transmission parameters of the two-port network. Experimentally, the t-parameters can be obtained by short circuiting and open circuiting the output one at a time. The following procedure shows how to calculate the parameters: Output port is open-circuited: i.e. I2 = 0 4 Figure4 A = V1 / V2 C = I1 / V2 Output port is short-circuited: i.e. V2 = 0 1 Figure5 B = V1 / I2 D = I1 / I2 Cascade Interconnection of two 2-port Networks: Considering the 2 networks A and B which are connected in cascade, as shown in Figure 6 below. From this the transmission parameters of the combined cascaded network (N) is obtained. The method is demonstrated below. 5 Figure 6 [t]N = [t]A.[t]B 7 Hence, the following result is obtained. 8 Parallel Interconnection of two 2-Port Networks: Considering the two networks A and B which connected in parallel, as shown in Figure 7 below. The overall y-parameters of the combined network N can be obtained as follows: 6 Figure 7 I1 = I1A + I1B I2 = I2A + I2B V1 = V1A = V1B V2 = V2A = V2B; And H:DropboxCamera Uploads2012-10-25 05.41.34.jpg It can be seen that the overall Y-parameters can be obtained by summing the corresponding Y-parameters of individual networks A and B, when the A and B networks are not altered by the parallel connection. Transient Responses of Two-Port Networks: Damping Ratio  Ã‚ º is defined as the ratio of the actual resistance in damped harmonic motion to that necessary to produce critical damping. It is also known as relative damping ratio. We divide the transient responses into three types on the basis of damping ratio  Ã‚ º, Over damped response ( Ã‚ º > 1), Under damped response ( Ã‚ º Critically damped response ( Ã‚ º = 1). The various conditions stated above are described in detail below. Over damped Response: In this case the roots of the characteristic equation are real and distinct. The solution to the input signal is a decaying exponential function with no oscillations and the transient response will be over damped. The response to the input signal is slow and has no overshoots or undershoots. Under damped: The roots are complex in this case. The transient response will be under damped when  Ã‚ º Critically damped: When  Ã‚ º = 1, the roots are real and equal, and the transient response to the input signal will be critically damped. There will be no oscillations whatsoever. This case is a desirable outcome in many industries. In this experiment, we are mainly using the second type, which is the under damped response. And the characteristic equation is given by: S2 + 2 Ã‚ ºÃƒ Ã¢â‚¬ °nS + à Ã¢â‚¬ °n2 where à Ã¢â‚¬ °n = undamped natural frequency = 1/à ¢Ã‹â€ Ã… ¡( LC ) à Ã¢â‚¬ °n à ¢Ã‹â€ Ã… ¡ (1  Ã‚ º2 ) = damped natural frequency {A484D667-ABED-4193-B38C-40120C378004}  Ã‚ º = damping ratio = Further critical details have been illustrated in the Appendix B of Laboratory manual of Experiment L212. Objectives: To measure the admittance-parameters and transmission parameters of two-port network To investigate the relationships between individual network parameters and two-port networks in cascade and parallel connections To study the transient response of a two-port network containing capacitive and inductive reactances. Equipment: Digital Storage Oscilloscope Function Generator (50ÃŽÂ ©) Digital Multimeter Inductor with 2 inductance steps Capacitors: 22ÃŽÂ ¼F, 100ÃŽÂ ¼F Resistors: 33ÃŽÂ ©, 100ÃŽÂ © (2 numbers), 220ÃŽÂ ©, 330ÃŽÂ ©, 560ÃŽÂ ©, 680ÃŽÂ ©, 3.9kÃŽÂ ©, 4.7kÃŽÂ © (2 numbers), 5.6kÃŽÂ ©, 6.8kÃŽÂ © Bread-board Procedure: Measurement of Admittance-Parameters and Transmission Parameters and to investigate the relationships between individual network parameters and two port networks in cascade and parallel connections Setup A Connect the resistive network A as shown in Figure 8 below. With the network connected in the circuit, apply a sinusoidal voltage of 1 kHz, and amplitude 10 volts from peak to peak at: Port 1 with port 2 open-circuited Port 1 with port 2 short-circuited Port 2 with port 1 short-circuited In each case measure the voltage and current at the input and output terminals The input voltage is measured by observing the peak to peak value on the scope of the oscilloscope while the output voltage is measured with the digital meter. Tabulate the results in Table 1. (all the values measured should be in rms) Figure 8: The resistive network A{DA60CACE-9B44-4522-A111-F57AC9F95897} Setup B: Connect the resistive network as shown in the Figure 9 below. With the network connected in the circuit, apply an identical sinusoidal voltage as in Setup A at: Port 1 with port 2 open-circuited Port 1 with port 2 short-circuited Port 2 with port 1 short-circuited Measure the identical reading as in Setup A in the same way. Tabulate the results in the same Table 1.{0536D217-3D48-4F28-B37B-77F1CB823EEA} Figure 9: The Resistive Network B Cascaded Setup: Connect the networks A and B in cascade as shown in the Figure 10 below. Measure the identical parameters with the identical voltage and applying the voltage at the same positions as was done in the previous two setups A B. Tabulate the readings in Table 1 again.{32E83E0D-6633-4D97-A59B-4374AF22F541} Figure 10: The Cascaded Network of Networks A B Parallel Setup: Reconnect the individual networks A B in parallel as shown in Figure 12 below. Repeat the same procedures above with the same voltage as above to this network. Tabulate the readings in Table 1.{591F8FFC-7083-4E49-88AD-96E019FAD63C} Figure 12: The Parallel Network of Networks A B Table 1: (All values in rms) Results I2 = 0 V2 = 0 V1 = 0 I1 (mA) V1 (V) V2 (V) I1 (mA) I2 (mA) V1 (V) I1 (mA) I2 (mA) V2 (V) Network A (measured) 2.38 3.45 2.52 5.09 3.82 3.45 4.00 5.65 3.46 Network B (measured) 0.72 3.49 3.22 3.27 2.82 3.45 2.89 3.18 3.45 Cascaded (measured) 2.66 3.47 2.07 3.42 1.31 3.44 Parallel (measured) 13.28 11.59 3.46 10.34 12.55 3.46 Questions: The voltages V1 and V2 should not be connected to channel 1 and 2 of the scope simultaneously. Why? It can be observed from the circuit that both the ports V1 and V2 have different grounds. If V1 and V2 are connected simultaneously to channel 1 and 2 of oscilloscope respectively, then the ground terminals of V1 and V2 will be short-circuited as they are connected through the oscilloscope. This would change the circuits configuration and would give us the readings for a completely different circuit which would differ a great deal from the accurate values. What should you do to the readings of peak to peak voltage in order to make them compatible with the currents measured by the digital meter? The relationship between peak to peak values and its respective rms values is: peak to peak voltage = 2 x à ¢Ã‹â€ Ã… ¡2 x rms voltage The current measured by the digital meter is in root-mean-square value (rms). So it is mandatory to convert the peak to peak voltages to its rms value in order to be compatible with the currents measured by the digital meter. Hence the peak to peak value is divided by 2 x à ¢Ã‹â€ Ã… ¡2 to so that it is compatible with the currents measured by the digital meter. Compare the theoretical results with the measurement readings recorded in Table 1 for the interconnected two-port networks. Explain any of the differences in the two sets of results. Two kinds of parameters values are calculated and shown in Table 2 and Table 3. With this parameter values we can compare the difference in values of the measurement and theoretical readings. The parameter values in Table 2 shown below are defined as When the output-port is open, I2 = 0 Then: A = V1 /V2 C = I1/V2 When the output port is shorted, V2 = 0 Hence: B = V1/I2 D = I1/I2 And Cascade (theoretical) is obtained by [t]N = [t]A . [t]B Transmission parameters A B C D Network A (measured) 1.36 677.80 0.00094 1.33 Network B (measured) 1.08 1223.40 0.00022 1.16 Cascade (theoretical) (Network A * Network B) 1.62 2450.07 0.0013 2.69 Cascade (measured) 1.68 2625.95 0.00129 2.61 Percentage difference between cascade (measured) and (theoretical) 3.70% 6.69% 0.78% 3.07% Table 2 As it can be seen from the Table 2 above that there are slight differences between the theoretical and experimental results of the transmission parameters of the individual network and the interconnected two-port networks. The difference is observed due to the experimental human errors, tolerance levels of resistors in networks and slight deviation due to the slight inaccuracy of equipment. The parameter values in Table 3 shown below are defined as When the output port is shorted, V2 = 0. Then: y11 = I1 /V1 y21 = I2/V1 When the input port is shorted, V1= 0. Then: y12 = I1/V2 y22 = I2/V2 And Parallel (theoretical) is obtained by Network A values + Network B values Table 3: Admittance Parameters Admittance parameters y11 y12 y21 y22 Network A (measured) 0.00148 0.00156 0.00107 0.00163 Network B (measured) 0.00095 0.00084 0.00082 0.00092 Parallel (theoretical) (Network A + Network B) 0.00243 0.00240 0.00189 0.00255 Parallel (measured) 0.00384 0.00299 0.00335 0.00363 Percentage difference between Parallel (measured) and Parallel (theoretical) 36.72% 19.73% 43.58% 29.75% From Table 3, it can be observed that the difference between experimental and theoretical admittance parameters are quite large. The large difference is due to the same experimental errors and small tolerance of resistors or the existing voltage drop of the multimeter. Measurement of Transient Response of Two-Port Networks: {ECB52EDE-2A5E-423C-AE62-ECF870EBA09C} Figure 13 Connect the circuit as shown in the Figure 13 above with C = 22  Ã‚ ­F Using a storage scope and with the inductor setting at position 1, inject 10V peak to peak square wave at V1. Choose frequency f of the input voltage such that the square waves leading edge simulate a step input with the transient response completed before the next voltage change. The frequency f is chosen to be about 4 Hz. Record the output waveform V2 with the storage oscilloscope. Sketch the waveforms and when the waveforms have been captured, use the oscilloscope cursor to measure the oscillation period T and the voltages Va and Vb as shown in the Figure 14 below. The waveform is shown in Figure i) below. {71B3E9F8-C513-4F5A-9441-0C73C0A0C9B8} V1 Input Voltage V2 Output Voltage Tin Input signal period T Transient Oscillation Va / Vb Transient Oscillation Voltage Ratio Period Figure 14 Repeat the above procedure for the inductor setting at position 2. The waveform is shown as in Figure ii) below. Repeat the procedure for the two inductor settings with the capacitor changed to 100ÃŽÂ ¼F. The waveforms are show as Figure iii) and iv) below respectively. Add a resistor R2 of 33 ÃŽÂ © in series with inductor L as shown in Figure 15 below and select the inductor setting at position 1 with the capacitor = 100 ÃŽÂ ¼F. The waveform is shown as in Figure v) below. Repeat all the procedures with R2 values of 100 ÃŽÂ © and 220 ÃŽÂ ©. The waveform with R2 as 100 ÃŽÂ © is shown in Figure vi) below. All measurements are recorded in Table 4 below.H:DropboxCamera Uploads2012-10-25 06.12.32.jpg Figure 15 Figure a Figure b Figure c Figure d Figure e Figure f Figure g Condition C=22ÃŽÂ ¼F L = 1H C=22ÃŽÂ ¼F L = 200mH C=100ÃŽÂ ¼F L = 1H C=100ÃŽÂ ¼F L = 200mH C=100ÃŽÂ ¼F L = 1H and add R2=33ÃŽÂ © C=100ÃŽÂ ¼F L = 1H and add R2=100ÃŽÂ © C=100ÃŽÂ ¼F L = 1H and add R2=220ÃŽÂ © T(ms) 48.0 19.0 38.5 94.5 80.20 Period = 253.0 Άt1 =130.0 Άt2 =46.00 V2 =2.531 Va(v) 3.00 1.46 0.791 1.80 1.687 1.250 Vb(v) 0.633 0.700 0.408 0.516 0.3750 0.5000 Table 4 Waveform Figures: L:AAADS0001.BMP Figure i) L:AAADS0003.BMP Figure ii) L:AAADS0006.BMP Figure iii) Figure iv)L:AAADS0007.BMP L:AAADS0008.BMP Figure v) Figure vi) L:AAADS0009.BMP Questions: Why are square waves at a higher frequency not used as input? Square waves at higher frequencies are not used as input because frequency is related to time period by the relationship f = 1/T. So as the frequency is increased, the time period will become shorter and shorter. So it will take shorter time for the output power levels to stabilize after the input circuit stops drawing power. Hence the waveform obtained from the oscilloscope will not be clear enough for proper distinction. What causes the step input voltage to become an oscillating output voltage? The oscillating output voltage is caused due to the presence of the two reactive elements in the circuit, the inductor and the capacitor. The effect of charging and discharging of the capacitor and inductor causes the output to become an oscillating voltage. What are the effects of increasing the values of L and C? The undamped natural frequency à Ã¢â‚¬ °n equals to 1/à ¢Ã‹â€ Ã… ¡( LC ). If the values of L and C are increased, the undamped natural frequency will reduce simultaneously. Hence the oscillations will become more damped. Thus the number of output oscillations will reduce. Calculate the theoretical frequencies of oscillation and compare with the experimental results. The theoretical frequency is given by the relation ft = 1/ (2  Ã‚ ° à ¢Ã‹â€ Ã… ¡(LC)) Hz and the oscillation frequency is given by the relation f = 1/T. Using this relation we can tabulate the values. Figure a Figure b Figure c Figure d T(ms) 48.0 19.0 38.5 94.5 1/T(Hz) 20.83 52.63 25.97 10.58 ft (Hz) 33.93 75.87 35.59 15.92 Percentage difference 38.60% 30.63% 27.03% 33.54% The difference in the values is caused by the tolerance levels of the reactive elements used in the circuit i.e. the inductor and the capacitor. Consider the circuit shown in Figure 13. Obtain the expression for the damping ratio of the circuit.{A484D667-ABED-4193-B38C-40120C378004} Damping Ratio is given by the formula,  Ã‚ º = The natural undamped frequency is given by the relation à Ã¢â‚¬ °n = 1/à ¢Ã‹â€ Ã… ¡ (LC). Since R2 = 0, R1 = 330 à ¢Ã¢â‚¬Å¾Ã‚ ¦ and R3 = 100 à ¢Ã¢â‚¬Å¾Ã‚ ¦, deriving the damping ratio of the circuit as shown in Figure 13, the result is:  Ã‚ º = à ¢Ã‹â€ Ã… ¡(L/C)/860. Obtain the condition for the underdamped response in Figure 13. From the derived result obtained above,  Ã‚ º = à ¢Ã‹â€ Ã… ¡(L/C)/860. For an underdamped response, the damping ratio, ÃŽÂ ¾, should be less than 1, thus à ¢Ã‹â€ Ã… ¡(L/C)/860 What is the effect of adding resistance R2 in the LC circuit? {A484D667-ABED-4193-B38C-40120C378004} According to the formula of damping ratio  Ã‚ º = When R2 is added, the total value of  Ã‚ º increases. Depending on the value of R2,  Ã‚ º 1, even if the number of undershoots and overshoots is reduced, the response will be slower. Conclusion: The parameters of the two-port network, especially the Y-parameters and Transmission parameters (A, B, C, D) were determined experimentally. They can also be calculated theoretically. This experiment is aimed at comparing the differences between the experimental and theoretical values. The relationship between individual network parameters and two-port networks in cascade and parallel connections were also investigated. The results obtained for these were shown in the calculations in the Questions answered previously. Hence if every individual parameter of the networks can be determined, the parameter of the combined system can be determined. Part 2 was focused on studying the transient responses of the experiment. The responses to the change of values in the RLC circuit in the two-port networks were recorded. By varying the values of the capacitor, resistor and inductor, it was observed that increase in the capacitor and inductor values decrease the oscillating frequency and also reduce the number of undershoots and overshoots in the response signal. By adding a resistor in series with the inductor, it was observed that the resistor increases the damping ratio of the circuit but the effect is still dependent on the final damping ratio of the circuit,  Ã‚ º. To summarize the conclusion, all the objectives as stated earlier were met in course of the experiment and a lot of important observations came to light in the area of two-port networks.