Analyzing Talk Among Friends Essay Example for Free

Analyzing Talk Among Friends Essay In the preceding example, the utterance Ahma git me Ð ° gig! was interpreted differently by the participants in the interaction. So the question to be asked about Ahma git me Ð ° gig! is, what does it mean (how did the listeners arrive at their understandings), and what particular features of language and/or social situation signal that meaning? To arrive at an understanding of what the utterance meant, interpretations are not constructed solely from the speakers perspective but are also gathered from the participants who heard the utterance. Later, others may be asked to listen to Ð ° recording and share their understandings of the utterance(s). Then, the analysts task is to make an in-depth study of the selected instances of verbal interaction, observe whether or not actors understand each other, elicit participants interpretations of what goes on, and then (Ð °) deduce the social assumptions that speakers must have in order to act as they do, and (b) determine empirically how linguistic signs communicate in the interpretation process ( Gumperz 1982: 35). In the analysis of the example noted here, for instance, Gumperz was able to show that most white speakers did not seem to understand the utterance other than as Ð ° lapse into dialect or saw the switch to Black English as Ð ° rejection of whites and the speaker addressing himself only to other black students. Black students, however, explained the students remark as an attempt to justify himself by appealing to others in the group, Іm just playing the game as we blacks must do if we are to get along in Ð ° white world, while also identifying Ð ° particular rhythm in the utterance that led them to their interpretation. Thus, features of language carry social meaning that plays Ð ° significant role in interpreting what speakers mean (see Gumperz 1982: 29-37 for Ð ° detailed explanation of this example and its interpretation). While this example should make any interpreter wonder how they are interpreting meaning of speakers who differ in some way, such as region of the country, age, ethnicity, gender, my point here is about the analysis of natural language and how discourse analysts determine what speakers mean and how language conveys elements of meaning. Using these methods to analyze interpreted discourse is Ð ° way of understanding how the participants in an interpreted interaction understand each other at the time. Gumperz proposed that Ð ° theory of discourse must take into account both the linguistic and socio-cultural knowledge that an interlocutor must have to maintain involvement in an interaction, Accounting for such knowledge demonstrates two things: (1) meanings are jointly constructed between speakers as they talk, and (2) conversations contain internal evidence of their outcomes, that is, the ways in which participants share, partially share, or do not share, mutual conventions for meaning and how they succeed in achieving their communicative ends. Tannen reached Ð ° similar conclusion. She called such linguistic and social knowledge conventions by which meaning is communicated in social interaction (1984: 151). In Conversational Style: Analyzing Talk Among Friends, Tannen (1984) analyzed two and Ð ° half hours of conversation over Ð ° Thanksgiving dinner. She defined and discussed features of conversational involvement, such as topic, pacing (how relatively fast or slow one spoke), narrative strategies (in what order events are told, how speakers made their point, etc.), and expressive paralinguistic (intonation, pitch, and others), which together pattern in different ways the speech of different participants. For three of the speakers, these features combined in acceptable ways of having Ð ° conversation, but three other speakers experienced the same conversation as unusual and their participation faltered. When speakers share conventions for signaling meaning, they can be said to share Ð ° conversational style ( Tannen 1984). Tannens approach to studying discourse, modeled after Gumperz, is characterized by (1) recording naturally occurring conversations; (2) identifying segments in which communication may seem to flounder or be troublesome; (3) looking for patterned differences in signaling meaning that could account for trouble; (4) playing the recording, or segment of it, back to participants to elicit their spontaneous interpretations and reactions, and also, perhaps later, eliciting their responses to the researchers interpretations; and (5) playing segments of the interaction for other members of the cultural groups represented by the speakers to discern patterns of interpretation. Tannens study suggests that within an interpreted interaction speakers who do not share Ð ° common language also have conversational styles that they do not necessarily share with the interpreter. For example, Tannen (1994) has demonstrated that Ð ° discourse approach to gender and language, following in the tradition of Gumperz, can be understood by looking for differences in the way women and men signal meaning in conversation. This has great implications for interpreters: what happens when interpreter’s do not share Ð ° conversational style with one or both speakers? Many interpreters are women who interpret for men. Do they understand male strategies for asking questions or giving information? Do men understand female strategies? As her research demonstrates, the notion of cross-cultural encompasses more than just speakers of different languages or from different countries; it includes speakers from the same country of different class, region, age, and even gender ( Tannen 1985: 2o3). Gumperzs analysis of brief utterances located within Ð ° social scene and Tannens analysis of Ð ° single extended interaction via the same analytical and interpretive framework provide Ð ° rigorous methodology for analyzing conversational interactions, including interpreted conversations. Their emphasis on soliciting participant reactions and interpretations, along with close transcription of contextualization cues in language, provides Ð ° framework for going beyond Ð ° mere structural description of an interpreted encounter to an intense scrutiny of turn-taking as experienced by the participants, including phenomena such as simultaneous turn-taking.

1800s Era of Good Feelings Essay Example for Free

1800s Era of Good Feelings Essay Although many seemingly happy events such as the â€Å"Era of Good Feelings† and the granting of universal white manhood suffrage occurred during the early 1800s, the statement that nationalism and not the fear of sectionalism caused westward expansion is an invalid statement. Westward expansion was truly an effect of a growing sectionalism in the country originating from events such as the Tariff of 1828 , the National Bank, and the Missouri Compromise. Preceding the Missouri Compromise was the Tallmadge amendment. When the Tallmadge amendment was passed, the South was infuriated. The amendment decreed that the slave state of Missouri had to gradually free all of their slaves and prohibited any more slaves to be brought into Missouri before they could be admitted into the Union. See more: Homelessness as a social problem Essay This made slave-owning Southerners upset because they viewed the amendment as a threat to sectional equality and balance. With the South suspicious of the North trying to ban slavery and the North suspicious of the South trying to expand slavery, both sides naturally flocked to the West in order to gain another slave or free state to tip the balance of power in their direction. Even in the Florida Purchase Treaty of 1819, after war hero Andrew Jackson exceeded his orders from the White House and tore through Florida, motives for acquiring new land seemed to continually hint towards the growing sectionalism and concern about the issue of slavery. Also, the uneasy Missouri Compromise gave both North and South even more reason to expand westward. The Missouri Compromise established Missouri as a unrestricted slave state which gave abolitionists and Northerners great concern about the spread of slavery while the establishment of the Missouri Compromise line that prohibited slavery above it caused Southerners to worry about slavery too. All the suspicions and fears of the two sections resulted in a fast and furious expansionism in the west. Then, during the presidency of John Quincy Adams, his nationalistic policies of roads and canals laid a heavy financial burden upon the federal government requiring the continuation of the tariff which caused tension among the South. The National Bank, although established by the nationalist Alexander Hamilton, played a big role in sectionalism in the United States. When the Bank of the United States irresponsibly overspeculated in the West, the financial crisis of 1819 arose in which many western banks were shut down and had to foreclose mortgages on numerous farms in the West. The foreclosure of farms in the West made the National Bank extremely unpopular in the West and fueled western sectionalism, pushing western farmers to lean towards the slave-owning Southerners in the battle for influence in the West. In addition to these events, the Tariff of 1828 made Southerners angry yet again and widened the rift between the North and South even more. The extremely high tariff was not for revenue but rather for the purpose of protecting American manufacturing. This made the Southerners upset because it showed partiality to the northern factories and hurt the southern farmers who were large consumers of manufactured goods. The hated tariff would then prompt South Carolina to take action and bring out the old Kentucky and Virginia resolutions to nullify the tariff. Thus, these two events added to the worries of both sides and to the westward expansion fever.

The History of Electromagnetic Suspension System

The History of Electromagnetic Suspension System As the knees are the important part of the human body because of which he can walk, run, sit and jump properly, the suspension system is a knee of a vehicle, with which the vehicle can give us a comfortable ride. The automobile frame and body are mounted on the front and rear axle not directly but through some form of springs and shock absorbers. This is done to damp to road shocks transmitted to the frame by the wheels as they roll over the road. All these parts which perform this function are together called as a suspension system. Thus the suspension system includes springs, shock absorber and there mountings. The suspension system of a motor vehicle divided into the rear end suspension front end suspension. 1.1 Need of suspension system: To avoid the road shocks which are pass on to the vehicle frame. To preserve the steadiness of a car in pitching or rolling, when in motion. To safeguard the occupant from road shocks. To provide good road holding while driving, cornering and braking. To maintain proper steering geometry. 1.2 Types of suspension systems: The following are the suspension systems which rare used in the modern vehicles, Dry friction or Leaf spring Coil spring Air bag Rubber spring Electromagnetic suspension system 1.3 History of suspension system: Rolls Royce (1913) illustrates that how the different situations was in the early years where rear dampers stopped to use. Dry snubbers were used in between 1910-1925. However, the period 1925-1980 was very extensive by simple hydraulics, primarily simply constant force blow off, then proportional characteristics, then adjustable, leading to mature product. In the period of 1980 to 1985, there was an enthusiasm about the possibilities for the different types of active suspension, and they had the ability to get rid of the ordinary dampers. Then after some period in 1985, the fast auto-adjusting dampers, turn out to be more and more obvious, because they found a good deal profit of active suspension much more cheaply, and from that period the damper unexpectedly became an interesting, developing component again (Dixon John, 2010). In 1966 for high-speed transportation Danby and Powell introduced an EDS system using super conducting magnets with a null flux suspension. After some period some more designs proposed using continues sheet guide ways. Then some from U.S., Japan, Germany, UK and Canada have developed further innovations (such as ladder type guide way for increased lift efficiency), but there are still a number of technical problems that needed resolution. (T. Thompson, Richard D. Thornton and Anthony Kondoleon, 2010) 1.4 Current Details Of Electromagnetic Suspension (Maglev): There are three primary types of Maglev technologies: superconducting magnets ( electrodynamic suspension) feedback controlled electromagnets ( electromagnetic suspension) A new but very cheaper permanent magnet system Inductrack. The several approaches and designs have been produced by Japan and Germany. These two countries are very active in maglev research. The design used for trains in which the train levitate by the repulsive force of the same poles of the magnets. A linear motor is used to propel the train or on the locomotive or both. In this system massive electrical induction coils produce the magnetic field and the need of this magnetic field which is placed along the track is to propel the train, leading some to speculate that the cost of constructing such tracks would be enormous. ( Heller Arnie 2010). Earnshaws theorem states that a collection of point charges cannot be maintained in a stable stationary equilibrium configuration solely by the electrostatic interaction of the charges. As Earnshaws theorem says Magnetic bearings are unstable; the conventional maglev systems stabilized with the help of the electromagnets which have electronic stabilization. In actual to levitate the train that is to keep the train up in the air with the help of an magnetic field it needs very strong magnetic field which only can generate by a large electromagnet but large electromagnet is also a big issue for the design, so instead of using the large magnets, superconductor for an capable electromagnet. Inductrack is a cheap in cost compare to other systems. The system relies on the current induced in the passive electromagnetic array generated by permanent magnets, so that it provides the better load carrying capacity related to the speed. In the model, the permanent magnets are placed on both sides of the model; the function of these magnets is to provide horizontal lift and vertical stability. There is collection of wire loops in the track which is also called as array. There is no power supply in magnets and the model, apart from the speed of the model. The basic concept behind this system is to store the power by developing the inductrack as a motor and flywheel bearing. With only slight design changes, the bearings were unrolled into a linear track. William Post is the father of such a great innovation like inductrack. He had done this experiment at Lawrence Livermore National Laboratory. (Heller Arnie 2010). Chapter 2 LITERATURE REVIEW 2.1 Principle of Suspension System: The suspension system of an automobile has input force and output as shown in above fig. Fig: 2.1 (Dr. Erping Zhou, 2010) where, M1 is the body mass of the vehicle M2 is the mass of the suspension system K1 is the spring constant for suspension system K is the constant for the tyre (spring). C is the damper constant Y is the input force form the road to the suspension system. Y1 is the input force from suspension system to the body of vehicle. X is the output displacement. So the mathematical diagram of the vehicle is given as: M2 K1(Y1- X)+ C. d(Y1- X)/ dt K2(Y-Y1) Therefore now we can have, K1(Y1- X)+ C. d(Y1- X)/ dt = M1 d2x/dt2(1) And K1(Y1- X)+ C. d(Y1- X)/ dt K2(Y-Y1) = M2 d2Y1/dt2(2) By lapalce theorem, consider d/ dt = S K1(Y1- X)+ C. S(Y1- X) = M1 S2X..(3) K1(Y1- X)+ C. S(Y1- X) K2(Y-Y1) = M2 S2Y1(4) So by solving equation (3) we get the input, K1Y1 K1X + CSY1 CSX = M1S2X X/Y1 = K1 + CS/ (M1S2 + CS + K1) Y1 (INPUT) = X (M1S2 + CS + K1) / K1 + CS (Dr. Erping Zhou, 2010) 2.2 Basic Concept: Take a cylindrical hollow shock absorber frame placing two magnets inside it. In this cylinder the arrangement of the magnets is in such a way, place one magnet at the top of the cylinder with any polarity let us consider south polarity on down side. Then place another magnet at the bottom of the cylinder having south polarity upside so that they can be parallel each other. Then due to the same polarity of both the magnets the repulsive force generates which gives the movement to the shaft to avoid any unwanted shocks and the fixed hydraulic damper absorbs the vibrations and instability. 2.3 Theory of Vibration: Any motion that repeats itself after an interval of time is called vibration or oscillation. The best examples for vibration are pendulum and a plucked string. The theory of vibration explains the study of oscillatory motions. Free vibration without damping To begin with the study of the mass-spring-damper, lets consider the damping is insignificant and the mass is free from any type of force that is called free vibration. Where, k is the constant of stiffness x is the length of stretched spring m is the mass of body So the force is given by, Fs = kx By Newtons second law of motion the generated force is proportional to the acceleration of the mass E F = ma = m.d2x / dt2 Then the sum of the forces on the mass is equals to zero: ma + kx = 0 If the system starts to vibrate by stretching the spring by the distance of A, we get the following equation. x(t) = A cos(2à Ã¢â€š ¬ fnt) The above explanation state that the system oscillates with the simple harmonic motion with an amplitude A , frequency fn. The number fn is called as the undamped frequency which is defined as: fn = To simplify the equation the angular frequency à Ã¢â‚¬ ° (à Ã¢â‚¬ ° = 2à Ã¢â€š ¬f) which has a unit radians per second. If the mass is heavy and inflexibility of the system is known, then the frequency concludes when the force is applied to the system, it will vibrate. When the system once disturbed it vibrates because it has one or more frequencies. The above formula shows the complexity in the real complex designs. (Tustin Wayne 2010) The causes of vibration in the system (conservation of energy) Conservation of energy explains the vibrational motion. In the above example the value of the spring is x and therefore it has stored some potential energy (kx2). Once the spring became free it tries to gain its original shape which has minimum potential energy and in the process accelerates the mass. As the spring reached at its original state that is in unstreched position all the potential energy then converted in to the kinetic energy (mv2). The system then starts to deaccelerate because of the compression of the spring and in this process it transfers kinetic energy into original potential energy. Thus oscillation of the spring transfers the kinetic energy into potential energy. In the above given simple system the mass remains oscillate at the same magnitude, but this doesnt happened in the real system because of the damper which disperse the energy and therefore the system finally bringing it to rest. (Tustin Wayne 2010) Free vibration with damping Now in this system a viscous damper is added to the system which generates an opposive force against the motion of the body which is relative to the velocity of the mass. Where c is the proportionality constant and has units of Force over velocity (N s/m). x m k c Fig: 2.3 (Tustin Wayne 2010) Fd = cv = -c. dx/dt By summing the forces on the mass we get the following ordinary differential equation: ma + cv + kx = 0 The result of the above equation relies on the amount of damping. For the small damping effect the system vibrates but after some time it slows down and finally stops vibrating. This case is called underdamping this case is of most interest in vibration analysis. If the damping effect increases until the last point of the oscillation of the system, the system then goes in to the critical damping. Cc = 2 Is the final critical damping point calue for the mass spring damper model. A damping ration is used to differentiate the amount of damping in a system. The differentiation of the damping is defined as to get a critical point the actual damping divided by the amount of damping. The damping ratio (ÃŽÂ ¶) given as: ÃŽÂ ¶ = c / The values of damping factors for airplane fuselage, engine crankshaft are less than 0.05 and for an automotive suspensions the range of 0.2-0.3. The key for the underdamped system for the mass spring damper model is : x(t) = Xe-ÃŽÂ ¶Ãƒ Ã¢â‚¬ °t cos ( à Ã¢â‚¬ ° = 2à Ã¢â€š ¬f The value of X, the initial magnitude, and à Ã¢â‚¬  , the phase shift, are determined by the amount the spring is stretched. (Tustin Wayne 2010) Analyzation of Damped and undamped natural frequencies The exponential term and the cosine function are the two main points which are noted from the solution. The meaning of exponential term is how quickly the system damps down. The damping effect is low when the damping ration is more. The cosine function explains the oscillations in the system, but the frequency of the oscillations is different from the undamped case. For this case the frequency is called damped natural frequency, fd, and there is a relation between the damped frequency and undamped frequency as follows: Fd = fn Generally, the undamped natural frequency is more than the damped natural frequency, but in realistic the difference between the damped and undamped frequencies is irrelevant because of the damping ratio which is moderately small. Therefore at the starting phase of natural frequency the damped and undamped description are frequently dropped.for example- when the damping ratio is 0.1, the damped natural frequency is only 1% less than the undamped. The two damping ratios 0.1 and 0.3 for the design of side shows how they affect the system and also they show how the system takes time to be stable. Also they show, most frequently what happened practically, is to calculate the free vibrations by doing some experiments after an impact on the system and then the system oscillates so by measuring the rate of oscillations conclude the natural frequency of the system as well as the ratio of damping with the help of rate of decay. Natural frequency and the damping ratio are the important factors in free vibrations but to understand and differentiate the behaviour of the system in different vibrations generated by force is also important. (Tustin Wayne 2010) 2.4 Principle of EMSS: The basic principle is to build up a contact less spring; the electromagnetic actuators can absorb the instability. The basics in electromagnetic suspension are the opposite polarity of the magnets facing each other absorbs all the bumps. The major difficulty is making the magnets physically powerful when running off a cars electrical system. 2.5 Halbach Arrays: Halbach cylinders are well-suited to magnetic levitation of gyroscope, motor and generator spindles. In these cylinders only permanent magnets and unpowered conductors are used to provide levitation. Rotational motion provides the energy of suspension entirely, efficiency is good, and there is no need of extremely low temperature suspension magnets or electronics. But there is a limit for the linear speed at the bearing race which must be above a meter per second to levitate. The inductrack maglev train system uses this principle as well, which avoids the problems inherent in actively supported systems. Halbach Cylinder: K = 1 K = 2 K = 3 K = 4A magnetized cylinder which is made up of a ferromagnetic material producing a magnetic field restricted completely inside the cylinder and doesnt produce any fields outside is called Halbach Cylinder. The Halbach Cylinders can also generate the magnetic field completely outside of the cylinder and then again it doesnt produce any fields inside the cylinder. Some magnetization distributions are shown below: Fig: 2.4 magnetization distributions( K. Halbach, J.C. Mallinson, Raich, H., Blà ¼mler 2010) The direction of magnetization within the ferromagnetic material is given by M = Mr { sin (kà Ã¢â‚¬ ¢)à °Ã‚ Ã‚ Ã¢â‚¬   cos (kà Ã¢â‚¬ ¢) à Ã¢â‚¬ ¢} Where, Mr is the magnetic remanance (T/m). +k is an internal magnetic field and -k is an external magnetic field. Preferably, the structures of these types of cylinders would be formed by an unlimited length cylinder of magnetic material which has the direction of magnetization constantly changing. These types of ideal designed cylinder produce the magnetic flux which is perfectly uniform and entirely confined to the bore of the cylinder. But in real case the infinite length of the cylinders cannot be used and in practice the limited length of the cylinders creates end effects which show the non-uniformities in the field within the bore. The complexity of developed a cylinder with a constantly changing magnetization also frequently directs to the design being broken into sections. ( K. Halbach, J.C. Mallinson, Raich, H., Blà ¼mler 2010) 2.6 Magnetic Material: Magnets have the basic property of attraction towards, or repulsion by other materials. A material with high permeability attracted strongly towards a magnet. There are two main examples of materials with very high permeability those are Iron and steel which powerfully attracted to magnets. Liquefied O2 is in fact slightly repelled by magnetic fields because it has very low permeability. People, gases and the vacuum of outer space has quantifiable permeability. The SI unit of magnetic field strength is the tesla, SI unit of total magnetic flux is the Weber. 1 Weber = 1 tesla following through 1 square meter, and is a very large amount of magnetic flux. Neodymium magnet: A neodymium magnet or NIB magnet which is also called as a rare earth magnet which is a good strength of attraction and repulsion, made of a combination of neodymium, iron and boron -Nd2Fe14B. Neodymium magnet on a bracket from a hard drive (PengCheng magnets Ltd., 2010) NIB magnets are comparatively very strong to their mass, they are mechanically brittle and the most powerful results to lose their magnetism at temperatures above 176 degrees fahrenheit or 80 degrees Celsius. In some cases they there strength is slightly more than samarium-cobalt like high-temperature grades will operate at up to 200 and even 230  °C. The neodymium magnet industry is constantly working to push the maximum energy product (strength) closer to the theoretical maximum of 64MGOe. A neodymium magnet has a capability to lift 1300 times more than its own mass. The small magnet have some remarkable properties it exhibits magnetic braking when moved near a non-magnetic metal due to induced eddy currents. (http://www.statemaster.com/encyclopedia/Neodymium-magnet, 2010) 2.7 Summery: The system mainly based on the repulsion of the two similar polarities of the two different magnets. The two damped and undamped systems gives the different vibration frequencies. The analyzation shows a major difference between damped and undamped system. The Halbach array stabilize the repulsive effect is to use field that move in space rather than just time. This effect can demonstrate with a rotating conductive disc and a permanent magnet, which will repel each other. A neodymium magnet or NIB is a powerfull magnet made up of a combination of neodymium, iron and boron- Nd2Fe14B is used in EMSS. Chapter 3 MAGLEV DESIGN 3.1 Electromagnetic Suspension System: (Concept) The design of the electromagnetic suspension system can be done with two types: 1) By using a Hydraulic Damper or 2) By using Linear Motor as a Damper. The concept is to design the magnetic suspension system on the front shock absorber of the motor bike to have a better performance with ease of handling and comfort ride. There are two cylinders installed on two separate arms of the front shock absorbing rods. The cylinder contains the pair of the cylindrical magnets having same pole facing each other to create the required repulsive force to have required levitation effect. The two cylindrical magnets having S (South Pole) on the outer surface concentric with the inner circle having N (North Pole) as shown in following figure:- 1) Working for the Hydraulic Damper: The two magnets are in a cylinder on a shaft, as seen in above figure comprise our required magnet for a motor bike front suspension system. In the fig. it shows the magnets are placed such as they are facing each other but with the same polarity, hence they repel each other according to the properties of magnets generate an air gap between them. The repulsive force restores displacement towards each other, and displacement away is restored by gravity. A hydraulic damper is fixed on the top of the cylinder and connected with the upper magnet with a shaft. The set of shocks used with magnets inside them that are used as the fork setup. In this cylinder the arrangement of the magnets is in such a way, place one magnet at the top of the cylinder with any polarity let us consider south polarity on down side. Then place another magnet at the bottom of the cylinder having south polarity upside so that they can be parallel each other. Then due to the same polarity of both the magnets the r epulsive force generates which gives the movement to the shaft to avoid any unwanted shocks and the fixed hydraulic damper absorbs the vibrations and instability. The shaft controlled the radial instability, the repelling force and the gravity force. The spring has a property to contract and extend but it cannot be stable, so the shaft is use to stabilize the spring. If the magnets are placed in two orthogonal axes, they repel each other but not in any one direction, so they are also instable. A thrust bearing can use to avoid the instability in which the magnets can be placed, and even if the instability take place the movable magnet will not fly has the advantage in that if instability does occur, the unstable magnet will not fly unpredictably away from the fixed magnet. The vibrations and the instability will be absorbed by the hydraulic damper. It is stated for completeness that the magnet has two poles North South. They will be attract each other if they are facing each other with different polarity, but they will repel each other if they are facing each other with same polarity.That these forces occur is very well known, but the mechanisms that create these forces are beyond the scope of this document. There are several materials of which permanent magnets may be made. 2) Working of Linear Motor as a Damper: A linear electromagnetic motor works in the straight line instead of work in rotary motion. The movement effect of this motor is very quick. L.E.M. can be used at each wheel in a vehicle which has a conventional shock and spring setup. The L.E.M. can extend as it faces any distraction like pothole and retract as it faces any bump just in milliseconds which is much greater speed than a hydraulic damper. These type of quicker retract and extract movement provides the steering stability by controlling the wheels with respect to the body of the vehicle. The L.E.M. made up of magnets and coils of wires. When current is passed through the coils, the motor retracts and extends so fastly, control unwanted movements. The speed is the major key benefit of the electromagnet. (Bose Elecromagnetic Suspension System, 2010) Fig: 3.2 (Bose Elecromagnetic Suspension System, 2010) The L.E.M. is designed in such a way so that it can give the quick respond to absorb the effects of bumps and pothols and also provides a relaxed ride. Moreover, the motor is designed such as it can supply the maximum power in a small package, which allows it to supply sufficient force to avoid the car from rolling and pitching during bad driving. At the time of acceleration, braking and cornering the L.E.M. neutralize the body motion of a car, which gives the driver a kind of driving idea and passengers comfort ride. For the smooth ride purpose, the wheel dampers are place in each wheel hub to smooth out small road imperfectionst. To generate more power an amplifier is provided which supplies the a great power to the L.E.M.s. The amplifier is a regenerative design that uses the compression force to send power back through the amplifier. (Bose Elecromagnetic Suspension System, 2010) 3.2 Goals of the magnetic design The design of the magnetic spring has the following requirements: 1. Freedom instability by one degree: In freedom instability by on degree generally the stability performance which is forecast by the non linear study is according to the formly build up linearized study. The study of freedom instability by on degree shows the relation between magnitude and velocity. As the velocity increases the magnitude increases which is increased by the stable limit cycle amplitude of vibration. Actuators are essential for stability control of every unbalanced axis. Hence the amount of unstable degrees of freedom needs to reduce. In addition to it for well organized passive vertical load bearing the direction of the unstable direction must be horizontal. 2. Ability to support large loads: Permanent magnets must be maintained on the entire weight of table plus equipment. This weight which is hold up by the electromagnets utilizes considerable amount of power which is unwanted for cost and heat reasons. 3. Effective electromagnet actuator placing: The forces which are applied asymmetrically by the actuators who apply a moment on the levitating table which would be unwanted. For rejecting vertical disturbances the electromagnet actuators must be used for the stabilizing of unstable axis. (S. J. Price and N. R. Valerio) Chapter 4 TECHNOLOGY There are three primary types of MAGLEV Technologies: One that relies on feedback controlled electromagnets (Electromagnetic Suspension or EMS). Ex.: Transrapid The another one relies on the superconducting magnets (Electrodynamic Suspension or EDS) Ex.: JR-Maglev And the last one and newer , potentially more economical system that uses premagnets i.e. Inductrack 4.1 Inductrack: A newer, perhaps less expensive system is called Inductrack. The technique used in inductrack has a load carrying capacity which is related to the speed of the vehicle, because the permanent magnets induce current in the passive electromagnetic array In the model, the permanent magnets are placed on both sides of the model; the function of these magnets is to provide horizontal lift and vertical stability. There is collection of wire loops in the track which is also called as array. There is no power supply in magnets and the model, apart from the speed of the model. The basic concept behind this system is to store the power by developing the inductrack as a motor and flywheel bearing. With only slight design changes, the bearings were unrolled into a linear track. William Post is the father of such a great innovation like inductrack. He had done this experiment at Lawrence Livermore National Laboratory. Inductrack uses Halbach arrays for stabilization. Halbach arrays are the system in which there are some arrangements of permanent magnets which stabilize moving loops of wires without electronic stabilization. Halbach arrays were initially developed for beam guidance of particle accelerators. They also have a magnetic field on the track side only, thus reducing any potential effects on the passengers. 4.2 Lift and Propulsion: In the whole world Japan and Germany are the most active in Maglev research; they have produced several difference approaches and designs. The technique used such as the train can be levitated by the repulsive of like poles or the attractive force of opposite poles of magnets. A linear motor propelled the train which is on the track or on the train, or both. In order togenerate the magnetic field which is necessary to propel the train there are massive electrical induction coils are placed along the track.(C.A. Guderjahn S.L. Wipf,2010) 4.3 Stability: Earnshaws theorem states that a collection of point charges cannot be maintained in a stable stationary equilibrium configuration solely by the electrostatic interaction of the charges. In the system the static magnetic bearing which uses only electromagnets and premagnets are unstable because of Earnshaws theorem; but the diamagnetic and superconducting magnets can support a Maglev steadily. Some conventional Maglev systems the electromagnets having electronic stability are used for stabilization. This works by constantly measuring the bearing distance and adjusting the electromagnets accordingly. 4.4 Magnet Weight The weight of large electromagnet is a major design issue. A very strong magnetic field is required to levitate the massive train, so conventional Maglev research is using superconductor research for an efficient electromagnet. Chapter 5 ANALYSIS 5.1 Dynamics of the magnetic suspension system: The basic principle of a simple electromagnetic suspension system is shown in Fig.1. the current I which is passes through the electromagnet generates the magnetic force Fm which acts opposite to the gravity and cause a steel ball to levitated position. The force relies on the current I, electromagnet properties and the air gap between the steel ball and the electromagnet.The motion of the steel ball in the magnetic field is expressed as G Fm = m d2X / dt2..(1) Where, m = the mass of the suspended steel ball, G = mg, the gravity force, X = the air gap between the steel ball and the electromagnet. The magnetic force Fm is a nonlinear function of the current I and the air gap X. The linearization of the static characteristic near the set point (F0 , X0 ,I0) is given as F = F0 + [I0 (X X0) + ]X0 (I I0).(2) The voltage equation of the electromagnetic coil is expressed as U = RI + L dI / dt.(3) Where, U = the voltage, R = the coil resistance, and L = the inductance. Inductance L=f (X, t) is a function of the air gap, the coil, the core, and the steel ball. The magnetic force which is generated by the electromagnet maintained the steady state air gap between the ball and the electromagnet is manipulated to balance the gravitational force of the ball. The small differences from the operating point are normalized over operating spaces (G, D, Imax , Umax) and they are defined as follows: f = , x= , i = , u = (4) Where, f i= the normalized resultant force, x = the normalized air gap, i = the ormalized current, and u = the normalized voltage. X^ , I^ , and U^ = the steady-state values. Substituting Eq. 4 into Eqs. 1, 2, and 3 the dynamics of the system can be presented as follows: f = -m d2x / dt2 = -m d2x / dt2 = d2x / dt2..(5) f = ]I0 x + ]X0 i , (6) u = i + (7) Let the set gains and time constants be Ke = ]X0 , Km = ]I0 , Te = , Tm = .(8) Therefore Eqs. 5, 6, and 7 can be rewritten as f = T2m d2x / dt2 ..(9) f = Kmx + Kei (10) u = i + Te .. (11) (M. Golob Boris Tovornik, 2010) The block diagram of the linearized model of the electromagnetic suspension system is shown in Fig. 5.2. The linear system described in the block diagram in Fig. 5.2 is unstable and controllable. As per the theory of vibration, there are two types of analysis, 1) The analysis of the Instability and the Vibration without damper and 2) The analysis of the Instability and Vibration with damper. These analyses were made in the electronic lab with help of the METLAB Software. For these two setups the two types of simulations were made in METLAB Software. The data used for the analysis is as follows: Table 3:Nominal System Parameters: Mass of the steel ball (m) 0.147 kg Maximum air gap (D) 0.025 m Number of coils (n) 1200 Coil re

The Monoamine Hypothesis, Placebos and Problems of Theory Construction in Psychology, Medicine, and Psychiatry :: Psychological Medical Psychiatric Essays

The Monoamine Hypothesis, Placebos and Problems of Theory Construction in Psychology, Medicine, and Psychiatry ABSTRACT: Can there be scientific theories in psychology, medicine or psychiatry? I approach this question through an in-depth analysis of a typical experiment for clinical depression involving the monoamine hypothesis, drug action, and placebos. I begin my discussion with a reconstruction of Adolph Grà ¼nbaum's conceptual analysis of 'placebo,' and then use his notion of "intentional placebo" to discuss a typical experiment using the monoamine hypothesis, two drugs and a placebo. I focus on the theoretical aspects of the experiment, especially on the notion of causal explanation. I then raise five conceptual and methodological problems for theory construction. These problems focus on questions of the causal efficacy of placebos and drugs; ad hoc versus ceteris paribus explanations in biomedicine and psychology; and the falsifiability of the monoamine hypothesis. I conclude by pointing out the need for further, rigorous philosophical analysis concerning the possibility of theory con struction in psychology, medicine, or psychiatry. I. Introduction Can there ever be scientific theories in psychology, medicine, or psychiatry? I argue that one approach to answering this question consists of investigating the nature of such purported theories and I focus on the monoamine hypothesis of clinical depression. (1) By a careful examination of a typical experiment involving the action of drugs and placebos for the cure of clinical depression-an experiment founded upon the monoamine hypothesis-I raise a number of methodological and conceptual problems that may lead one to conclude that rigorous scientific theories in these three disciplines may never be forthcoming, or at least that the state of scientific research in these areas is still in very rudimentary shape and in need of much logical and philosophical analysis. In addition, because no such biomedical theories may be forthcoming, I also undercut Adolf Grà ¼nbaum's analysis of the concept of a placebo, an analysis that makes the definition of "placebo" relative to a biomedical theo ry in the first place. I begin in section 2 by discussing Grà ¼nbaum's detailed analysis of what a placebo is. I then use his idea of a generic intentional Placebo and discuss one of many similar experiments concerning the phenomenon of clinical depression, experiments that use the monoamine hypothesis and the notion of a generic intentional placebo. This experiment is described in section 3. In section 4 I analyze the results of this study and in section 5 I offer concluding remarks.

RURAL PARADISE OR A CONCRETE JUNGLE? :: essays papers

RURAL PARADISE OR A CONCRETE JUNGLE? Over the course of the semester we have watched numerous movies (Heartland Reggae, The Harder They Come, Countryman, Dancehall Queen, Third World Cop, Rockers, and Land of Look Behind) that depict Rastafarians living in both the country and the city. Not knowing much about either Jamaican setting, I decided to take a closer look at both the urban and rural areas in which Rastafarians live and practice their beliefs. I wanted to see if the different settings had much influence on Rastafarians. Is this a personal choice they have or are they forced out of rural paradise and into the concrete jungle of Babylon? According to the Webster’s Third New International Dictionary the definition for urban is 1)a: of, relating to, characteristic of, or taking place in a city, b: constituting or including and centered on a city, c: of, relating to, or concerned with an urban and specifically a densely populated area. The definition for rural is: 1) living in country areas: engaged in agricultural pursuits, 2): characterized by simplicity: lacking sophistication: uncomplicated, 3): of, relating to, or characteristic of people who live in the country, 4): of, relating to, associated with, or typical of the country, 5): of, relating to, or constituting a tenement in land adapted and used for agricultural or pastoral purpose-opposed to urban. Many rural and urban areas exist in the United States. Depending on where you live definitely affects who you are, how you think, dress, eat etc. Is this true for the Rastafarians? GENERAL JAMAICA INFORMATION Located in the West Indian Islands, Jamaica represents the third largest island. Jamaica is 150 miles long and 52 miles wide. The subtropical climate does not produce the extremes related to climate found in the United States. The island of Jamaica is described as being very beautiful with its rivers, harbors, and many mountains. The population of Jamaica has not quite reached three million with the majority of people living in the city of Kingston, the capital of Jamaica (Barrett 3). The difference in wage earnings among Jamaican people is alarming. Those who have a profession make around thirty times as much as those who do not. Nearly half of all Jamaicans make less than twenty-five dollars per week (Barrett 12). There has been a tradition of migration from Jamaican rural areas since the nineteenth century.

A Comparison of The Yellow Wallpaper and The Darling -- comparison com

In Charlotte Perkins Gilman's, "The Yellow Wallpaper", and Anton Chekhov's, "The Darling", we are introduced to main characters with lives surrounded by control. In Gilman's, "The Yellow Wallpaper", the main character, which remains nameless, is controlled by her husband, John. He tells her what she is and is not allowed to do, where she is to live, and that is she is not permitted to see her own child. In Chekhov's, "The Darling", the main character, Olenka, allows her own opinions and thoughts to be those of her loved ones. When John puts the narrator into the room, she writes in despite of him telling her that she should not. At the end of her first passage, the narrator tells us, "There comes John, and I must put this away - he hates to have me write a word". The narrator was told that writing and any other intellectual activity would exhaust her. The only thing that exhausts her about it is hiding it from them. The narrator tells us, "I did write for a while in spite of them; but it does exhaust me a good deal - having to be so sly about it, or else meet with heavy opposition". Conrad Shumaker suggests that John believes that if someone uses too much imagination then they will not be able to figure out reality. "He fears that because of her imaginative 'temperament' she will create the fiction that she is mad and come to accept it despite the evidence - color, weight, appetite - that she is well. Imagination and art are subversive because they threaten to undermine his materialistic universe" In Gilman's "Why I Wrote the Yellow Wallpaper", Gilman tells us that when she was sent home from the rest cure, Dr. Mitchell gave her "solemn advice to 'live as domestic a life as far as possible,' to 'have but two hours intellectual... ...lf. Her thoughts were always for someone beside herself. When Olenka was alone "she had no opinions of any sort. She saw the objects about her and understood what she saw, but could not form any opinion about them, and did not know what to talk about." Olenka had nothing to make conversation and if she would make conversation, she could not give her opinion. In conclusion, both women had a strong control factor in their life. In "The Yellow Wallpaper", the main character makes no decisions of her own. Her husband, John, controls everything she does. In "The Darling", the men surrounding her life control all of Olenka's opinions. The men do not mean for it to be this way but that is just how Olenka is. She allows herself to not be able to think on her own. These characters have similar personalities. They both allow themselves to be controlled throughout their lives.

The Effects of High Glucose Intake

Glucose is a sugar that comes from the breakdown of all carbohydrates in the diet, and is very soluble in water. The chemical formula for glucose is C6H12O6. Glucose is a vital part of brain function as it is the only fuel that your brain can use. If you are consuming a low-carbohydrate diet, you may not be getting enough glucose for your brain to function properly. Because your brain ultimately controls all other functions within your body, giving your brain too little glucose can be dangerous to your overall health. Also, overconsumption of sugar in the body can lead to unpleasant phenomena. According to biochemistry Reginald Garrett, Ph. D. and Charles Grisham, Ph. D. the first major side effect of glucose overconsumption is a sugar high (hypoglycemia), which feels a bit like a caffeine buzz, because glucose absorption occurs really fast in the body when partaking too much sugary foods. Diabetes is a very scary and progressive disease, which can result a serious social problem and an economic burden on a person who has this kind of disease. Collective efforts are needed to improve both the level of knowledge about the disease and the outcomes of patient management. Therefore, the American Diabetes Association (ADA) aiming to increase the level of knowledge about diabetes and to determine both appropriate uses of blood glucose monitoring and appropriate measures required to accurately assess the performance of this practice. The first goal of ADA is to identify critical elements of a proper clinical trial of self-monitoring of blood glucose in type2 diabetes. According to American Diabetes Association, a person who has type 2 diabetes or a non-insulin-dependent has a lot of complications because their body can't use the insulin properly but their pancreas produces too much insulin. So, when the body can't use enough insulin and there is too much insulin in the body, the glucose or the sugar will build up in the blood instead of going to the cells. When these things happen, the cell of the body can't function properly because the cells need sugar for the energy. There are some problems found when the glucose build up to the blood and it include the following: first is damaging of the body, where the high glucose (sugar) levels in the blood damage the nerve and the small blood vessels in the eyes, kidneys, and the heart, and it can cause the hardening of a patients artery and it can lead into a sudden heart attack or maybe a stroke. Second is the malfunction of the kidney when the high amount of glucose in the blood of a patient, and it can cause a frequent urination which a large amount of water will be lost in the body, this can cause of dehydration. Third is when a person can't change the fluid that they lost or the person is not able to intake some fluids when they are very dehydrated, the patient becomes very sick and lead into diabetic come which is a life threatening complications. There some cases that the symptoms are very mild and can't be detected, in these cases the patients usually want to drink more liquid and they feel very thirsty, the patients feel exhausted at all time, they always feel nausea with the unclear vision, their skin is usually dry and flaky, when they get wounds it is very slow to get healed, and can't feel anything on their hands and feet because of losing sensation. From all these symptoms, only doctors can diagnose weather you are a hypoglycemic or hypoglycemic by conducting some test or measuring the glucose in the blood after instructing the patient not to eat for eight hours before the testing. This test is called glucose tolerance. There were an experimental studies and observational studies that too much intake of sugar in the body is more likely to develop type 2 diabetes, and too much sugar intake is associated with the development of obesity. Although there's no established RDA (Recommended Daily Allowance) for sugar, because as far as it's known, sugar is not really needed for nutrition, compare to salt that has restrictions in taking it. All foods have some natural sugars, but sugar itself, the white or brown but the stuff in the cookies, is a purely optional taste sensation. The USDA (United States Department of Agriculture) recommends that sugar make up no more than 8% of the daily intake of calories, but most. American adults take in twice that much. If you still consume sugar, it should be 12 teaspoons added sugar for a 2000 calorie per day diet, that is, no more than 40 grams per day for a 2000 calorie diet. Remember that the daily limit of 40 grams refers to refined and processed sugars only. There seems to be no limit on natural sugars. In these studies using the models called econometric of cross-sectional data on diabetes which is repeated and there are 175 countries participate for the nutritional components of food, these studies found that one can of soda is 150 kcal per person per day and it is increasing the availability of sugar and there is a relation with increasing of diabetes cases. When they're done with this testing and tried to control for other food types like; some meat, some fruits, some oils, and some cereals, monitoring the total calories intake, the overweight person and some obesity cases, some period effects, and some social economic like their income, their crowded places and a very low income. There was no other food typed that was yielding, important individual association with the total number of cases of a disease in a given population at a specific time after they were controlling the case for obesity. According to this study, the sugar on diabetes was the biggest impact and it was not dependent of tending to sit about without taking much exercise and the usage of alcohol, there was an effect which is modified but it's not that clear for obesity or for the diabetes. After all these reviews, the high sugar intake and the proportion of a population found to have diabetes, and the bearing of high sugar intake on overweight are being discussed. The evidence is not accurate for the proportion of a population found to have diabetes was because of high sugar intake, but it doesn't mean that taking too much sugar in the body is not important. Since the population of obesity in the world, and the case of diabetes is growing rapidly, there should be restrictions of sugar in the diet, and it is very important like the other restrictions of diet. In conclusion the requirement of screening is the screener need to show them that they like the benefit of screening. It didn't show that there is a clear benefit from the screening of the hyperglycemia or they called it glucose intolerance, mostly was women who are pregnant, and pregnant women who are at risk of caesarean section, and the disadvantage which is the acquired of the status of this disease. That screening was being argued on how to identify somebody who is at risk of succeeding non-insulin-dependent (type 2 diabetes) or a patient who is suspected to have that disease and undiagnosed is a good thing.