Time dilation and length contraction

Time dilation and length contraction INTRODUCTION: Time dilation is a phenomenon (or two phenomena, as mentioned below) described by the theory of relativity. It can be illustrated by supposing that two observers are in motion relative to each other, and/or differently situated with regard to nearby gravitational masses. Length contraction, according to Hendrik Lorentz, is the physical phenomenon of a decrease in length detected by an observer in objects that travel at any non-zero velocity relative to that observer. This contraction (more formally called Lorentz contraction or Lorentz-Fitzgerald contraction) is usually only noticeable, however, at a substantial fraction of the speed of light; and the contraction is only in the direction parallel to the direction in which the observed body is travelling. SPECIAL RELATIVITY : When such quantities as length, time interval and mass are considered in elementary physics, no special point is made about how they are measured This theory has a wide range of consequences which have been experimentally verified, including counter-intuitive ones such as length contraction, time dilation and relativity of simultaneity, contradicting the classical notion that the duration of the time interval between two events is equal for all observers. (On the other hand, it introduces the space-time interval, which is invariant.) Combined with other laws of physics, the two postulates of special relativity predict the equivalence of matter and energy, as expressed in the mass-energy equivalence formula E=mc2, where c is the speed of light in a vacuum.The predictions of special relativity agree well with Newtonian mechanics in their common realm of applicability, specifically in experiments in which all velocities are small compared with the speed of light. Special relativity reve als that c is not just the velocity of a certain phenomenon-namely the propagation of electromagnetic radiation (light)-but rather a fundamental feature of the way space and time are unified as space time. One of the consequences of the theory is that it is impossible for any particle that has rest mass to be accelerated to the speed of light. POSTULATES OF SPECIAL RELATIVITY: TWO postulates are as follows : The law of physics are the same in all inertial frames of reference. The speed of light in free space has the same value in all inertial frame of reference. OVERVIEW OF TIME DILATION : Time dilation can arise from (1) relative velocity of motion between the observers, and (2) difference in their distance from gravitational mass. In the case that the observers are in relative uniform motion, and far away from any gravitational mass, the point of view of each will be that the others (moving) clock is ticking at a slower rate than the local clock. The faster the relative velocity, the more is the rate of time dilation. This case is sometimes called special relativistic time dilation. It is often interpreted as time slowing down for the other (moving) clock. But that is only true from the physical point of view of the local observer, and of others at relative rest (i.e. in the local observers frame of reference). The point of view of the other observer will be that again the local clock (this time the other clock) is correct, and it is the distant moving one that is slow. From a local perspective, time registered by clocks that are at rest with respect to the local frame of reference (and far from any gravitational mass) always appears to pass at the same rate. There is another case of time dilation, where both observers are differently situated in their distance from a significant gravitational mass, such as (for terrestrial observers) the Earth or the Sun. One may suppose for simplicity that the observers are at relative rest (which is not the case of two observers both rotating with the Earth an extra factor described below). In the simplified case, the general theory of relativity describes how, for both observers, the clock that is closer to the gravitational mass, i.e. deeper in its gravity well, appears to go slower than the clock that is more distant from the mass (or higher in altitude away from the center of the gravitational mass). That does not mean that the two observers fully agree: each still makes the local clock to be correct; the observer more distant from the mass (higher in altitude) makes the other clock (closer to the mass, lower in altitude) to be slower than the local correct rate, and the observer situated closer t o the mass (lower in altitude) makes the other clock (farther from the mass, higher in altitude) to be faster than the local correct rate. They agree at least that the clock nearer the mass is slower in rate, and on the ratio of the difference. This is gravitational time dilation. FORMULAE OF TIME DILATION AND LENGTH CONTRACTION: TIME DILATION: t0 is the proper time between events A and B for a slow-ticking observer within the gravitational field, tf is the coordinate time between events A and B for a fast-ticking observer at an arbitrarily large distance from the massive object (this assumes the fast-ticking observer is using Schwarzschild coordinates, a coordinate system where a clock at infinite distance from the massive sphere would tick at one second per second of coordinate time, while closer clocks would tick at less than that rate), G is the gravitational constant, M is the mass of the object creating the gravitational field, r is the radial coordinate of the observer (which is analogous to the classical distance from the center of the object, but is actually a Schwarzschild coordinate), c is the speed of light, and r0 = 2GM / c2 is the called the Schwarzschild Radius of M. If a mass collapses so that its surface lies at less than this radial coordinate (or in other words covers an area of less than 4pG2M2 / c4), then the object exists within a black hole. LENGTH CONTRACTION: This effect is negligible at everyday speeds, and can be ignored for all regular purposes. It is only when an object approaches greater speeds, that it becomes important. At a speed of 13,400,000 m/s, the length is 99.9% of the length at rest and at a speed of 42,300,000 m/s still 99%. As the magnitude of the velocity approaches the speed of light, the effect becomes dominant, as can be seen from the formula: Note that in this equation it is assumed that the object is parallel with its line of movement. Also note that for the observer in relative movement, the length of the object is measured by subtracting the simultaneously measured distances of both ends of the object. For more general conversions, see the Lorentz transformations. AN EXAMPLE OF TIME DILATION: A spaceship is flying a distance of 5lighthours, for example from Earth to the dwarf planet which Earth and Pluto are motionless. Formula used : t.. time indicated by the spaceship clock t.. time indicated by the clocks of the Earth-Pluto-system v.. speed of the spacecraft relatively to the system of Earth and Pluto c.. speed of light REMARKS: In a simplifying way there was assumed an inertial system in which Earth and Pluto are motionless; especially the motion around the Sun was neglected. According to an important result of the theory of relativity, an observer in the Earth-Pluto-system would see the spacecraft shortened in the direction of motion. This so-called Lorentz contraction was not taken into consideration in order to make it possible to read off the spaceships clock. BASIS IN RELATIVITY: The origin of length contraction in the special theory of relativity can be traced to the operational definitions of simultaneity and length.According to Milne and Bondi the following operational definitions are assigned to simultaneity and length: an observer moving uniformly along a straight line sends out a light signal at time t0 to a distant point (stationary according to the observer), where it arrives and is immediately reflected at time tr, arriving back at the observer at time ta. What time does the observer ascribe to the time of reflection tr, or, what event is simultaneous with the reflection? Let l be the distance to the point of reflection. An observer, with his or her definition of c,says it takes time l / c for light to reach the reflector. Because light travels at the same speed c in both directions, it takes the same time both ways, so it returns to the observer at time ta = t0 + 2 l / c, or in other words, the distance to the point of reflection is l = c ( ta t0 ) / 2, and the time at which reflection occurred is simultaneous with the clock registering ( t0 + ta ) / 2. With these operational definitions for determining length and simultaneous events, two observers in constant relative motion at velocity v are considered, and their time and length scales compared. The result of the above definitions is that time and length are connected by the Lorentz factor ?: PHYSICAL ORIGIN OF LENGTH CONTRACTION: Length contraction as a physical effect on bodies composed of atoms held together by electromagnetic forces was proposed independently by George FitzGeraldand by Hendrik Lorentz . The following quote from Joseph Larmor is indicative of the pre-relativity view of the effect as a consequence of James Clerk Maxwells electromagnetic theory: if the internal forces of a material system arise wholly from electromagnetic actions between the system of electrons which constitute the atoms, then the effect of imparting to a steady material system a uniform velocity of translation is to produce a uniform contraction of the system in the direction of motion, of amount (1-v2/c2)1/2 The extension of this specific result to a general result was (and is) considered ad hoc by many who prefer Einsteins deduction of it from the Principle of Relativity without reference to any physics.In other words, length contraction is an inevitable consequence of the postulates of special relativity. To gain a little physical insight on why length contractions occur, consider what those postulates involve: by requiring the speed of light (a quantity dependent on the fundamental properties of space and time) to be invariant in all frames of reference (including ones in motion) one can appreciate that it would require the distortion of the measures of length and time. Apparently Lorentz did not agree to the criticism that his proposal was ad hoc. the interpretation given by me and FitzGerald was not artificial. It was more so that it was the only possible one, and I added the comment that one arrives at the hypothesis if one extends to other forces what one could already say about the influence of a translation on electrostatic forces. Had I emphasized this more, the hypothesis would have created less of an impression of being invented ad hoc. (emphasis added) The Trouton-Rankine experiment in 1908 showed that length contraction of an object according to one frame, did not cause changes in the resistance of the object in its rest frame. This is in agreement with some current theories at the time (Special Relativity and Lorentz ether theory) but in disagreement with FitzGeralds ideas on length contraction. EXPERIMENTAL CONFIRMATION: Time dilation has been tested a number of times. The routine work carried on in particle accelerators since the 1950s, such as those at CERN, is a continuously running test of the time dilation of special relativity. The specific experiments include: Velocity time dilation tests Ives and Stilwell (1938, 1941), An experimental study of the rate of a moving clock, in two parts. The stated purpose of these experiments was to verify the time dilation effect, predicted by Lamor-Lorentz ether theory, due to motion through the ether using Einsteins suggestion that Doppler effect in canal rays would provide a suitable experiment. These experiments measured the Doppler shift of the radiation emitted from cathode rays, when viewed from directly in front and from directly behind. The high and low frequencies detected were not the classical values predicted. Rossi and Hall (1941) compared the population of cosmic-ray-produced muons at the top of a mountain to that observed at sea level. Although the travel time for the muons from the top of the mountain to the base is several muon half-lives, the muon sample at the base was only moderately reduced. This is explained by the time dilation attributed to their high speed relative to the experimenters. That is to say, the muons were decaying about 10 times slower than if they were at rest with respect to the experimenters. Hasselkamp, Mondry, and Scharmann(1979) measured the Doppler shift from a source moving at right angles to the line of sight (the transverse Doppler shift). The most general relationship between frequencies of the radiation from the moving sources is given by: as deduced by Einstein (1905). For phi = 90^circ(cosphi = 0,) this reduces to fdetected = frest?. Thus there is no transverse Doppler shift, and the lower frequency of the moving source can be attributed to the time dilation effect alone. Gravitational time dilation tests Pound, Rebka in 1959 measured the very slight gravitational red shift in the frequency of light emitted at a lower height, where Earths gravitational field is relatively more intense. The results were within 10% of the predictions of general relativity. Later Pound and Snider (in 1964) derived an even closer result of 1%. This effect is as predicted by gravitational time dilation. Velocity and gravitational time dilation combined-effect tests Hafele and Keating, in 1971, flew caesium atomic clocks east and west around the Earth in commercial airliners, to compare the elapsed time against that of a clock that remained at the US Naval Observatory. Two opposite effects came into play. The clocks were expected to age more quickly (show a larger elapsed time) than the reference clock, since they were in a higher (weaker) gravitational potential for most of the trip (c.f. Pound, Rebka). But also, contrastingly, the moving clocks were expected to age more slowly because of the speed of their travel. The gravitational effect was the larger, and the clocks suffered a net gain in elapsed time. To within experimental error, the net gain was consistent with the difference between the predicted gravitational gain and the predicted velocity time loss. In 2005, the National Physical Laboratory in the United Kingdom reported their limited replication of this experiment. The NPL experiment differed from the original in that the caesium cl ocks were sent on a shorter trip (London-Washington D.C. return), but the clocks were more accurate. The reported results are within 4% of the predictions of relativity. The Global Positioning System can be considered a continuously operating experiment in both special and general relativity. The in-orbit clocks are corrected for both special and general relativistic time dilation effects as described above, so that (as observed from the Earths surface) they run at the same rate as clocks on the surface of the Earth. In addition, but not directly time dilation related, general relativistic correction terms are built into the model of motion that the satellites broadcast to receivers uncorrected, these effects would result in an approximately 7-metre (23ft) oscillation in the pseudo-ranges measured by a receiver over a cycle of 12 hours. Muon lifetime A comparison of muon lifetimes at different speeds is possible. In the laboratory, slow muons are produced, and in the atmosphere very fast moving muons are introduced by cosmic rays. Taking the muon lifetime at rest as the laboratory value of 2.22  µs, the lifetime of a cosmic ray produced muon traveling at 98% of the speed of light is about five times longer, in agreement with observations. In this experiment the clock is the time taken by processes leading to muon decay, and these processes take place in the moving muon at its own clock rate, which is much slower than the laboratory clock. TIME DILATION AND SPACE FLIGHT: Time dilation would make it possible for passengers in a fast-moving vehicle to travel further into the future while aging very little, in that their great speed slows down the rate of passage of on-board time. That is, the ships clock (and according to relativity, any human travelling with it) shows less elapsed time than the clocks of observers on Earth. For sufficiently high speeds the effect is dramatic. For example, one year of travel might correspond to ten years at home. Indeed, a constant 1g acceleration would permit humans to travel as far as light has been able to travel since the big bang (some 13.7 billion light years) in one human lifetime. The space travellers could return to Earth billions of years in the future. A scenario based on this idea was presented in the novel Planet of the Apes by Pierre Boulle. A more likely use of this effect would be to enable humans to travel to nearby stars without spending their entire lives aboard the ship. However, any such application of time dilation during Interstellar travel would require the use of some new, advanced method of propulsion. Current space flight technology has fundamental theoretical limits based on the practical problem that an increasing amount of energy is required for propulsion as a craft approaches the speed of light. The likelihood of collision with small space debris and other particulate material is another practical limitation. At the velocities presently attained, however, time dilation is not a factor in space travel. Travel to regions of space-time where gravitational time dilation is taking place, such as within the gravitational field of a black hole but outside the event horizon (perhaps on a hyperbolic trajectory exiting the field), could also yield results consistent with present theory. LORENTZ TRANSFORMATION: In physics, the Lorentz transformation, named after the Dutch physicist Hendrik Lorentz, describes how, according to the theory of special relativity, two observers varying measurements of space and time can be converted into each others frames of reference. It reflects the surprising fact that observers moving at different velocities may measure different distances, elapsed times, and even different orderings of events. The Lorentz transformation was originally the result of attempts by Lorentz and others to explain observed properties of light propagating in what was presumed to be the luminiferous aether; Albert Einstein later reinterpreted the transformation to be a statement about the nature of both space and time, and he independently re-derived the transformation from his postulates of special relativity. The Lorentz transformation supersedes the Galilean transformation of Newtonian physics, which assumes an absolute space and time (see Galilean relativity). According to special relativity, this is only a good approximation at relative speeds much smaller than the speed of light. LORENTZ TRANSFORMATION RELATIVISTIC LENGTH CONTRACTION: One of the peculiar aspects of Einsteins theory of special relativity is that the length of objects moving at relativistic speeds undergoes a contraction along the dimension of motion. An observer at rest (relative to the moving object) would observe the moving object to be shorter in length. That is to say, that an object at rest might be measured to be 200 feet long; yet the same object when moving at relativistic speeds relative to the observer/measurer would have a measured length which is less than 200 ft. This phenomenon is not due to actual errors in measurement or faulty observations. The object is actually contracted in length as seen from the stationary reference frame. The amount of contraction of the object is dependent upon the objects speed relative to the observer. Temporal coordinate systems and clock synchronization In Relativity, temporal coordinate systems are set up using a procedure for synchronizing clocks, discussed by Poincarà © (1900) in relation to Lorentzs local time (see relativity of simultaneity). It is now usually called the Einstein synchronization procedure, since it appeared in his 1905 paper. An observer with a clock sends a light signal out at time t1 according to his clock. At a distant event, that light signal is reflected back to, and arrives back to the observer at time t2 according to his clock. Since the light travels the same path at the same rate going both out and back for the observer in this scenario, the coordinate time of the event of the light signal being reflected for the observer tE is tE = (t1 + t2) / 2. In this way, a single observers clock can be used to define temporal coordinates which are good anywhere in the universe. Symmetric time dilation occurs with respect to temporal coordinate systems set up in this manner. It is an effect where another clock is being viewed as running slowly by an observer. Observers do not consider their own clock time to be time-dilated, but may find that it is observed to be time-dilated in another coordinate system. SIMPLE INFERENCE OF TIME DILATION : Time dilation can be inferred from the observed fact of the constancy of the speed of light in all reference frames. This constancy of the speed of light means, counter to intuition, that speeds of material objects and light are not additive. It is not possible to make the speed of light appear faster by approaching at speed towards the material source that is emitting light. It is not possible to make the speed of light appear slower by receding from the source at speed. From one point of view, it is the implications of this unexpected constancy that take away from constancies expected elsewhere. Consider a simple clock consisting of two mirrors A and B, between which a light pulse is bouncing. The separation of the mirrors is L, and the clock ticks once each time it hits a given mirror. In the frame where the clock is at rest (diagram at right), the light pulse traces out a path of length 2L and the period of the clock is 2L divided by the speed of light: From the frame of reference of a moving observer traveling at the speed v (diagram at lower right), the light pulse traces out a longer, angled path. The second postulate of special relativity states that the speed of light is constant in all frames, which implies a lengthening of the period of this clock from the moving observers perspective. That is to say, in a frame moving relative to the clock, the clock appears to be running more slowly. Straightforward application of the Pythagorean theorem leads to the well-known prediction of special relativity: The spacetime geometry of velocity time dilation Time dilation in transverse motion. The green dots and red dots in the animation represent spaceships. The ships of the green fleet have no velocity relative to each other, so for the clocks onboard the individual ships the same amount of time elapses relative to each other, and they can set up a procedure to maintain a synchronized standard fleet time. The ships of the red fleet are moving with a velocity of 0.866 of the speed of light with respect to the green fleet. The blue dots represent pulses of light. One cycle of light-pulses between two green ships takes two seconds of green time, one second for each leg. As seen from the perspective of the reds, the transit time of the light pulses they exchange among each other is one second of red time for each leg. As seen from the perspective of the greens, the red ships cycle of exchanging light pulses travels a diagonal path that is two light-seconds long. (As seen from the green perspective the reds travel 1.73 (sqrt{3}) light-seconds of distance for every two seconds of green time.) One of the red ships emits a light pulse towards the greens every second of red time. These pulses are received by ships of the green fleet with two-second intervals as measured in green time. Not shown in the animation is that all aspects of physics are proportionally involved. The light pulses that are emitted by the reds at a particular frequency as measured in red time are received at a lower frequency as measured by the detectors of the green fleet that measure against green time, and vice versa. The animation cycles between the green perspective and the red perspective, to emphasize the symmetry. As there is no such thing as absolute motion in relativity (as is also the case for Newtonian mechanics), both the green and the red fleet are entitled to consider themselves motionless in their own frame of reference. Again, it is vital to understand that the results of these interactions and calculations reflect the real state of the ships as it emerges from their situation of relative motion. It is not a mere quirk of the method of measurement or communication. The four dimensions of space time In Relativity the world has four dimensions: three space dimensions and one dimension that is not exactly time but related to time. In fact, it is time multiplied by the square root of -1. Say, you move through one space dimension from point A to point B. When you move to another space coordinate, you automatically cause your position on the time coordinate to change, even if you dont notice. This causes time to elapse. Of course, you are always travelling through time, but when you travel through space you travel through time by less than you expect. Consider the following example: Time dilation; the twin paradox There are two twin brothers. On their thirtieth birthday, one of the brothers goes on a space journey in a superfast rocket that travels at 99% of the speed of light. The space traveller stays on his journey for precisely one year, whereupon he returns to Earth on his 31st birthday. On Earth, however, seven years have elapsed, so his twin brother is 37 years old at the time of his arrival. This is due to the fact that time is stretched by factor 7 at approx. 99% of the speed of light, which means that in the space travellers reference frame, one year is equivalent to seven years on earth. Yet, time appears to have passed normally to both brothers, i.e. both still need five minutes to shave each morning in their respective reference frame. As it can be seen from the above function, the effect of time dilation is negligible for common speeds, such as that of a car or even a jet plane, but it increases dramatically when one gets close to the speed of light. Very close to c, time virtually stands still for the outside observer. Time expands, space contracts Interestingly, while time expands from the perspective of the stationary observer, space contracts from the perspective of the moving observer. This phenomenon is known as Lorentz contraction, which is exactly the reciprocal of the above time dilation formula: l=l*sqr(1-v ²/c ²). Thus the space traveller passing by Earth at a speed of 0.99c would see its shape as an ellipsis with the axis parallel to his flight direction contracted to a seventh of its original diameter. That is of course, if he sees it at all, given the enormous speed. Therefore, space travel is shortened with the velocity of the traveller. A journey to the 4.3 light-years distant Alpha Centauri C, the closest star to our Sun, would take only 7.4 months in a space ship moving at 0.99c. The effect of time dilation has been experimentally confirmed thanks to very precise caesium clocks that can measure extremely small periods of time. Unfortunately, time dilation is completely outside of human experience, because we have not yet devised a way of travelling at speeds where relativistic effects become noticeable. Even if you spent your whole life in a jet plane that moves at supersonic speed, you would barely win a second over your contemporaries on the ground. And, not even todays astronauts can perceive the Lorentz contraction. Imagine you are a cosmonaut on board of space station Mir, moving at 7700 meters per second relative to Earth. Looking down upon Europe from space, you would see the entire 270 kilometre east to west extent of Switzerland contracted by a mere 0.08 millimetres. Can we travel at the speed of light? The hope that one day mankind will be able to travel at near-to-speed-of-light velocities seems farfetched, because of the incredible amounts of energy needed to accelerate a spacecraft to these speeds. The forces are likely to destroy any vehicle before it comes even close to the required speed. In addition, the navigational problems of near-to-speed-of-light travel pose another tremendous difficulty. Therefore, when people say they have to hurry in order to win time, they probably dont mean it in a relativistic way. Kant: Space and time are properties of thought The German philosopher, Immanuel Kant (1724-1804), maintained that time and space are a priori particulars, which is to say they are properties of perception and thought imposed on the human mind by nature. This subtle position allowed Kant to straddle the well-known differences about the reality of space and time that existed between Newton and Leibniz. Newton held that space and time have an absolute reality, in the sense of being quantifiable objects. Leibniz held against this that space and time werent really things, such as cup and a table, and that space and time have a different quality of being. Kants position agrees with Newton in the sense that space and time are absolute and real objects of perception, hence, science can make valid propositions about them. At the same time, he agrees with Leibniz by saying that time and space are not things in themselves, which means they are fundamentally different from cups and tables. Of course, this view of space and time also introduc es new problems. It divides the world into a phenomenal (inner) reality sphere and an noumenal (outer) reality sphere. From this academic separation arise many contradictions in epistemology. We will, however, not deal with this particular problem at this point. Life in a spacetime cubicle From Relativity we learn that time and space is seemingly independent of human experience, as the example of time dilation suggests. Since our own perception of time and space is bound to a single reference frame, time appears to be constant and absolute to us. Physics teaches us that this is an illusion and that our perception deceived us within living memory. Thanks to Einstein, we are now able to draw relativistic spacetime diagrams, compute gravitational fields, and predict trajectories through the four-dimensional spacetime continuum. Still, we are hardly able to visualise this spacetime continuum, or deal with it in practical terms, because human consciousness is bound to the human body, which is in turn bound to a single reference frame. We live within the confinements of our own spacetime cubicle. Considering that in Relativity, spacetime is independent of human perception, the Kantian understanding of space and time as a priori particulars seems to be obsolete. They are no longer properties of perception, but properties of nature itself. But, there is more trouble looming for Kant. Relativity stretches the distincti

ICT Meeting Special Needs

The person that I am going to be studying is Mr. C Aziz a man who lost his eyes when he was at the age of 32, due to an accident with a group of hooligans assaulting Mr Aziz on his way home one evening. Now Mohammed is currently 32 years of age and he and his wife live with their two sons. Mohammed Aziz is a musician, who aspires to one day be able to play as well as his idol Stevie Wonder. The topic blindness is often stereotyped to the thought of sight being gone forever, however in some cases of Blindness there is a chance of seeing again, however sadly in Mr Aziz's case, this is not a possibility. Blindness is the inability to see anything. Some people are called blind, even though they can see a vaguely. This is because they cannot see clearly, but can only see fuzzy shapes or colours. In modern countries, few young people are blind. Blindness is mostly caused by diseases of old people, like cataracts and trachoma. Sometimes, though, people are born blind. Some people are colour blind, which means they can see, however cannot tell certain colours apart. When people are blind they use such things as the alphabet in Braille and guard dogs to do every day things. Although again in Mohammed's case sadly he is not colour blind but fully blind. Technology 1 Braille Watch Braille watches have raised dots that allow a blind person to tell the time. Simply flip up the cover and feel the dots on the dial. There are different types of Braille Watches like the voice one that tells you the time when you need it and it is in digital and normally time. In Braille watches you can save appointments and notes and you can save birthdays and you can record voice and in also can tell you the temperature. Advantages o It's is small and the right size to fit a hand and says it in voice the time and date o Help people with appointments and helps them to not forget time and date and if they got anything information o Tell you everything in English, 99 different languages o It is like a person that is standing next to the blind person and helping Disadvantages o Not waterproof o Easily breaks o Something's very disturbing o Gets lost o One of the bad thing about Braille Watches is that it only reminds you once and that's bad because maybe the person is fast a sleep and can't hear it so they will mess the alarm How the technology meets their personal needs The Braille watch is particularly important in the life of Mr Aziz as it fits directly into his daily schedule. Mohammed, a devout Muslim, needs to wake up at 6am on a daily basis so he may do his daily prayers. The Braille watch is good for this as it allows him for one to be able to actually know the time, to know the right time in which he must pray, it also helps him as some Braille watches also have alarm clocks on them, this however may not be an option for Mr Aziz as, he has a very low budget, as a musician living off benefits from the government and disability benefits he does not have much money to be spending on luxury items, nevertheless Mohammed believes that religion is a very vital aspect of his life, and must uphold all traditions so an alarm is a must (Mohammed believes that if he devotes his life to his religion then one day his eyes may be healed by a miracle. The Braille watch also helps Mr Aziz as it allows him to keep track of when to take his eye medication. Even though Mr Aziz's eyes are now permanently obsolete, he must still use his droplets to prevent any infections in his eyes that may cause him discomfort, and with the help of the Braille watch he is able to know the time at all times and keep track with his medical schedule. Finally although Mr Aziz is sadly blind, he is still a very joyful individual person overall and likes to enjoy himself, with the help of the Braille watch, Mr Aziz he is able to watch all his favourite TV programmes on time without missing a single moment of the show. I believe that the Braille watch is an excellent technology in helping the blind or visually impaired to keep good track of the time. With the compact designs that house the Braille watch, and the voice helper, with over 99 languages built in, as well as a tonne of other gadgets, including I believe that the Braille watch is the ultimate timepiece of the 21st century when thinking of how to help the visually impaired with timekeeping. However with the Braille watch, the problem may arise that if the watch is broken, or needs repairing in any manner then getting the watch repaired is a very tricky matter, firstly it may be very costly as there are not many shops that repair Braille watches, and secondly as I just said there are not many stores that sell Braille watches so finding a shop which would repair the watch would be a strenuous task in itself. How the technology meets their social needs The Braille watch is pretty hand when it comes to Mr Aziz's social needs. As the Aziz family is quite lazy, Mr Aziz relies on his watch to wake up in the morning and to wake up his fellow family members for both work and school. As was said before Mr Aziz is over a very cheery man, he does not allow his sight to bring him down in life, this is why he has many friends in his local area, the element of kindness and happiness is very strong in the heart of Mr Aziz, so attracts the friendship of many of his peers. The Braille watch allows him to keep up to track with his friends on a daily basis. Another branch of Mohammed's daily routine consists of him going to one of his neighbours house daily to discuss topics such as football and their married lives, however Mohammed must wait until 10:15 every day to attend his friends home as he must wait for the children to be sent to school and the missus to go to work, this is where the Braille watch comes in, it allows Mohammed to keep track of the right time him to make his daily visit to his acquaintances' home. Everyday Mohammed rings his home town of Afghanistan to check on his brothers, sisters and parents and see how their lives are going. The time zones however are very different in these two regions of the world, so Mohammed has to use his watch to know the right time, so he does not call at an inconvenient time when his parents are sleeping. His wife is not able to help him with this as well as she works a very tight shift to try support her family (however she does not do it very well, working as a shop assistant on minimum wage makes it very difficult) so she does not have the time to call Mohammed and tell him the time in Kabul, this is why the Braille watch is very vital in his social life. Moreover, everyday at lunchtime Mr Aziz goes to his local school, Wembley Manor Primary School and recites compositions on his piano for children during their lunch break, as part of a good citizenship programme he set up a year ago. The Braille watch is very important as he only plays the piano during the children's lunch time which only lasts 1 hour, so Mr Aziz cannot be late, obviously there will be no penalty for coming late to this job, as it is all voluntary work, however the children enjoy his piano playing very much and would be terribly disappointed if he did not make a session, this is why Mr Aziz needs to hold on to his Braille watch and know the right time to get to the school. As was said before, if the watch does in fact get ruined or needs repairing, then on top of trying to find a store that restores Braille watches, he would need to get one of his friends or wife to escort him to the store, as he cannot see himself, this may bother his friends if they are busy and do not have time to take him. How the technology meets their needs in employment Mohammed Aziz is a composer and composes melodies for himself and for retail; she can make a living, although at the time being he has not been selling much. Mohammed needs to be able to have certain times of the day where he dedicates it to his music, so as not neglect his music, this is where the Braille watch fits in, Mr Aziz sets it on reminder everyday at 9pm so it rings and reminds him that he needs to finish his composing, this may be done without the use of his watch, by his wife reminding him if he forgets, however his wife is not at home at all times, she sometimes goes over to her neighbours house for their book club, and Mr Aziz forgets also at times so using the Braille watch is the most efficient way to remind him of the tasks he needs to do. I think that even though the Braille watch does an adequate job in helping Mohammed keep up with his work schedule by reminding him of the time he needs write his compositions, there may be a better technology such as a handheld PC with Braille keys that could assist him around the day. This however is very pricey and probably not in Mr Aziz's price range, so must be reconsidered, also if it is bought, the issue of thieves must also be thought, a Handheld PC specially made for blind people is very pricey and if a thief is to take advantage of Mr Aziz's disability and rob him of his Handheld PC, then the financial implications should be thought about, does Mr Aziz have enough money to replace something so expensive, will it impact his family financially leaving them in debt? These are just some questions that would be thought of when buying something so expensive for Mr Aziz. If the watch breaks down before Mohammed is due to go to work (his voluntary work) then he may not be aware of the time and miss his normal music session at Wembley Manor, upsetting the children because they did not see their favourite musician playing during their lunch hour. Technology 2 Braille Notetaker The Iris kb line offers portable and compact personal data assistants equipped with Braille keyboards and refreshable Braille displays of 20 or 40 cells. This line is part of a range of new generation Braille devices by Euro Braille. These devices incorporate a broad range of applications and are available with either a 128 MB internal storage capacity 256 MB capacity. The series of four keys on both sides of the keyboard, used for navigation, have been placed as closely as possible to the keyboard to minimise hand movements. This helps achieve a more ergonomic design aimed at reducing your risk of repetitive motion injuries. Spreadsheet applications allow you to work with data and formulas in cells that are identified by line and column, Calculator applications allow you to make basic calculations, File Explorer application facilitate handling files and folders in a tree structure, Calendar application pages to organise your appointments and tasks, Contacts pages to easily store and retrieve all your contact information when you need it and more. Advantages o Braille Display with 20 or 40 characters o QWERTY Keyboard o 8-Key command keyboard o Lithium-ion battery for fast recharge: 10 hours of autonomy o Serial port for PC connection; Parallel port for Braille and black printing o VGA port to visualise iris documents on a computer monitor o RJ45 port for connection to Ethernet network RJ11 port for connection to a telephone network o 2 USB ports (type A) Loudspeaker + Audio – in (microphone) and Audio-out (headphones) o 12V supply o It is very light 1,7 kg o Dimensions: 24 cm x 20 cm x 3,8 cm o 12-volt main charger o it is like an computer with everything like USB reader/writer that is WinCE compatible (Floppy disk, memory, USB Key, etc) o Disadvantages o Cost's to much = à ¯Ã‚ ¿Ã‚ ½3,382 o slow writing o The charge run out quickly o It takes lots of time to charge up How the technology meets their personal needs The Braille note taker meets Mohammed's personal needs adequately as it allows him to make notes and write his compositions, this is especially good as Mohammed is not able to write his compositions with a pen and paper as he is blind, so he needs an alternative method which is user friendly to the visually impaired, hence the note taker. The note taker is also very light which allows Mohammed to keep it in his pocket without weighing him down, or sticking out of his pockets bringing any unnecessary attention for muggers or anyone with the intention to steal the note taker. Furthermore the note taker is actually very expensive, with a price ranging over à ¯Ã‚ ¿Ã‚ ½3000 it is no way in Mohammed's budget, however if he does receive one some way, perhaps from the government free of charge, to help his disability, then the small size will matter as it does not attract unwanted attention. The Note taker also meets Mr Aziz's personal needs as it has a 128mb or 258mb internal hard drive, which will allow him to store his music on. As Mohammed is a musician he has a strong passion for music, so being able to listen to his music frequently will bring great joy to him. The note taker will also allow Mr Aziz to keep a track of all special occasions through the use of the built in calendar that comes with most note taker, now Mr Aziz will never forget any special occasions or important dates. How the technology meets their social needs The Braille note taker is quite good in terms of Mr Aziz's personal needs. The note taker allows Mr Aziz to keep in constant contact with his friends who travel regularly, due to their jobs. The note taker allows him to do this by letting him send and receive emails. The note taker also allows Mohammed to exchange music with his friends via USB, this is a great advantage as he does not have to go out and buy the songs to listen to them, he can just get them off his friends if they have the songs on their PCs. As I said before, Mohammed's friends travel a lot due to demanding jobs, sometimes they are allowed to take a guest with them to the different locations of the world that they must go, so to feel Mohammed feel better about his eyes, they take him with them as their guests. However sometimes during their travels they sometimes get lost as they are in a foreign country and do not know their way around, this is where the note taker comes in, Mohammed can go on a website such as Google maps to then find the route to their destination. If unfortunately Mr Aziz's note taker was to be accidently damaged, lost or stolen, this could bring problems for not only himself but for his friends also. As Mr Aziz does not make a lot of money in his profession, he may need rely on his friends financially to fund for another note taker, or for the repair to his current note taker, this may be awkward for his friends as they must help him as they are his friends, but at the same time need the money so are then in a moral dilemma, to help their blind friend, or to keep the money and use it for themselves. This could also resolve in disputes amongst the friends if some help out Mohammed and others don't, some of the friends get be angered as to why they did not help him out. How the technology meets their needs in employment The Braille note taker helps Mr Aziz in his profession, as it allows him to message his record manager to tell him when his new compositions are ready; it also allows him to receive messages from his record manager to know times of important meetings, and times for his studio recordings. The note take also helps him in his work as it allows him to write his compositions, which needs to sell and make his living, without the compositions there would be no way for his music to succeed. Again the problem arises that if he loses the note taker, or it gets stolen, then he would have a very big problem on his hands, for one it would cost a lot of money to either replace the note taker (money which he does not have) or repair, but the other great problem would be that all of his appointment times and record dates would be gone, not only that but also all of Mr Aziz's compositions are saved on his note taker, so if he loses it then his songs would be lost as well, making him working as a musician obsolete as he does not have the tools for his success, his songs. Technology 3 Talking Typer for Windows Computer keyboarding and typing training software that speaks and displays lessons on screen. Includes drills, practice, and typing games. Adjustable to the student's level of skill and sight impairment. Recommended ages: 6 and older. Built from the ground up with blind and visually impaired students in mind, Talking Typing Teacher features digitized human speech, which is used everywhere in the program. This means that whether you're navigating menus, changing options, managing dozens of student accounts, or visiting the Help Desk, you'll enjoy listening to Eager Eddie read the screen. What makes TTT so special, however, is that each and every typing lesson or practice session is read aloud with clear, concise pre-recorded dialog. Put quite simply, you won't need to worry about trying to understand synthetic speech when you're learning to type with TTT. The only thing Text-To-Speech is really used for is to read your name and play back text you type into Workbook, a fully-functional talking word processor that ships with Talking Typing Teacher. Advantages o Built-in human speech (in the form MarvelTalk) that narrates the entire program o Complete interaction with both sound and full-colour animations o Detailed lesson curriculum designed with three levels of instruction o Full support for multiple student use. This means that you can have more than one student set up with the program, and TTT will pull up each student's record when he or she logs in. o Three levels of instruction that not only change the number of keys that are taught, but also how the instructions are worded and presented o Lessons that teach and reinforce typing, with careful emphasis on posture and correct typing habits o Lessons consisting of spoken and displayed instructions, practice drills, and final reminders o CD-ROM Drive o Intel Pentium @400 MHz Equivalent or Higher o Keyboard o Sound Card o 96MB RAM Disadvantages o Very old How the technology meets their personal needs This meets Mohammed's needs very well, as he is blind and needs to write using the Braille keyboard, it wastes a lot of time, however with the help of the talking typer Mohammed is able to quickly and efficiently type things on applications such as Microsoft word, all he has to do is say the sentence and the talking typer will automatically type the sentence out for him. It also helps Mr Aziz because as he is blind, he cannot navigate the mouse around the PC to find certain applications he is looking for, however with the help of the talking typer he can quickly and easily open applications by saying a couple of simple words, such as â€Å"open Microsoft Word† and then the application will be opened. The technology is very good for Mohammed Aziz as now he may be able to use the PC without the help of others, as he does not now need to rely on others for help, it now makes Mr Aziz feel happy about himself and not so useless and at a disadvantage due to his disability (even though he is, no one wishes to feel like they are worthless). The talking typer however does have a few faults to it, firstly it is a needs the hardware to operate, a microphone. This is a disadvantage as microphones can be easily broken due to their small flimsy fatigues; additionally it is much easier to be broken by a blind man as he cannot not see what he is doing. Furthermore the there are a very vast variety of applications and documents which exist in PCs, it is very hard for Mr Aziz to remember the names of all of these applications so that he can open them through voice commands, this is the extent which the technology meets his needs. How the technology meets their social needs The talking typer is fulfils his social needs to a great extent. As Mr Aziz is quite a popular guy thanks to his cheery attitude, he has plenty of friends, and likes to regularly socialise with them. He does this by meeting up with them, speaking to them on the phone, and emailing them or talking to them through an instant messaging service such as MSN Messenger. The talking typer allows him to make quick responses through the email service by just quickly saying everything that he wishes to be in his email, whereas before he had to wait for his wife to come home and type it all out for him (as he does not like using the Braille keyboard, it inflicts a slight pain in his fingers keeping them in the same positions typing constantly) Mr Aziz also uses the internet to buy clothes and his shopping through websites such as www.Asda.co.uk and www.Littlewoods.co.uk. With the help of the talking typer he can quickly order the goods through voice commands. How the technology meets their needs in employment The Talking typer does not help Mr Aziz is his profession very much. This is because he does not need to use the PC in his profession, and even if he does he may use his note taker instead, it is much more compact and can be used at any time or place, when he is inspired for a song he can quickly note down the ideas he has for his song rather than going home, wasting time and losing his inspiration. The talking typer is however good in some ways, it allows Mr Aziz to quickly memorise his lyrics, by inputting his lyrics through the talking typer he can then make the computer reply the lyrics and listen and memorise the words. Overall I do not think that there could be a better technology than the talking typer, perhaps a technology that connects directly to your mind and allows you to see computer images in your mind, would really benefit blind people, as it gives them the opportunity to actually see and use the computer efficiently, however this sort of technology has not yet been invented, but could be the hope for the future for the visually impaired.

China’s Economic Development since the 1950s

The last 50 years have witnessed a remarkable economic and political change in China. For many, the rise of the modern Chinese state is equaled to economic and political miracle; in reality, not the miracle, but a whole set of realistic reforms laid the foundation for the rapid economic growth in China. Chinese model of economic growth was not perfect, and evidently, the country had to pay a definite price for its wonderful and almost unbelievable achievements. However, even at times of serious economic and political crises, China did not lose the sense of its national dignity and pride. To understand the essence and the implications of the Chinese economic development means to understand the way the country was able to embrace the benefits of the communist system and the best features of the market economy; and China’s â€Å"putting people first† is the best and the most appropriate social perspective that can be used to analyze the rapid Chinese transformation over the course of 50 years. China’s Economic Development since the 1950s Introduction The last 50 years have witnessed a remarkable economic and political change in China. For many, the rise of the modern Chinese state is equaled to economic and political miracle; in reality, not the miracle, but a whole set of realistic reforms laid the foundation for the rapid economic growth in China. Chinese model of economic growth was not perfect, and evidently, the country had to pay a definite price for its wonderful and almost unbelievable achievements. However, even at times of serious economic and political crises, China did not lose the sense of its national dignity and pride. To understand the essence and the implications of the Chinese development means to understand the way the country was able to embrace the benefits of the communist system and the best features of the market economy; and China’s â€Å"putting people first† is the best and the most appropriate social perspective that can be used to analyze the rapid Chinese transformation over the course of 50 years. Pre-industrial China: the beginning of the 1950s and the legacy of the past Profound analysis of the Chinese economic and social revolution is impossible without analyzing the state of Chinese economy at the edge of the 1940s. After the Sino-Japanese War, China found itself in the midst of the growing economic crisis. â€Å"Russian troops occupied Manchuria and selectively dismantled industrial installations, carrying them off to the Soviet Union. Only the more modern and up-to-date equipment was carried off; the oldest and the most obsolete machinery was left in place† (Eckstein, 1997). Thus, by the end of the 1940s, the country was facing the deepening industrial crisis, which was accompanied by the need to restructure its system of agriculture, and to provide the national population with reasonable instruments for survival. As a result of industrial devastation, by the beginning of the 1950s Chinese industrial output fell almost 70 percent; the consumer goods output did not exceed 30 percent compared to the previous industrial peak in the 1940s (Riskin, 1987). The production decline was combined with the growing government expenses, and the government’s striving to reduce inflation and further, hyper-inflation. As a result, the nation was seeking the means of economic and social modernization; the communist model of economy and distribution has become the source and the basis of the major economic initiatives in the 1950s’ China. Late Maoism, egalitarianism, and equal distribution: putting people first Despite traditionally negative attitudes toward communism as such, late Maoism actually served the basis for developing and implementing a whole set of egalitarian policies – the policies that promoted redistribution of income and did not welcome the benefits and privileges of the social ranks and statuses. Redistribution and egalitarianism were further combined with industrialization and slow restructuring of the national agriculture. The First Five Year Plan has paved the way to rapid growth of less industrialized Chinese provinces: â€Å"all employee wages in state sector were set nationally and did not vary with labor productivity. Thus although more industrialized provinces had a higher proportion of well paid industrial workers in their industrial labor force, these workers wages were similar to those in less industrialized provinces where labor productivity was lower† (Riskin, 1987). The Great Leap initiative was developed to utilize labor surplus and to promote technological production (Eckstein, 1997). Whether those â€Å"equality† approaches were beneficial for all is not clear; but at that point of economic development the state was making everything it could to provide its citizens with material incentives for economic and social transformation. Maoism was promoting the value of unity, cohesiveness and social mobility, but those seemingly positive elements simultaneously sped up and retarded Chinese social and economic development. On the one hand, Mao was able to build a â€Å"developmentally oriented regime† (Eckstein, 1997), where people were committed to achieving the strategic national goals; on the other hand, conservative beliefs and outdated agricultural system were serious barriers to Chinese economic innovation (Eckstein, 1997). Nevertheless, Maoism was an essential component of Chinese movement to economic and social highs. Maoism positioned a Chinese citizen as the source and the center of the major transformational initiatives. Since the beginning of the 1970s, China was able to utilize the best features of Maoist egalitarianism, including personal initiative, inventiveness, innovation, and the willing to implement changes at all levels of the national economic performance. The 1970s, the revolutionary growth, and the new China By the beginning of the 1970s, China has finally realized the weakening potential of communism as the instrument of social change. At that time, the need for a new scientific development concept became evident. At the 10th Session of the Chinese Congress â€Å"the five balanced aspects – balancing urban and rural development, balancing development among regions, balancing economic and social development and opening wider to the outside world – became the major topic of discussion among deputies† (Consulate General of the People’s Republic of China in Houston, 2008). The need to promote social welfare pushed Chinese authorities to the need for reconsidering the major Maoist policies and reviving them in a more reasonable and measured form. China could no longer solely rely on the outdated communist values. To become an international economic power, the country had to adopt a new set of social and economic visions that would fit into the contemporary international developmental frameworks. International speed of economic development led Chinese policymakers to reevaluating the balance between agriculture, raw materials production, investment, and consumer products output. â€Å"Putting people first† has become the international top priority, and China could not ignore the significance of those humanist trends. Chinese economic openness and the development of the new market initiatives signified Chinese preparedness to a marking shift in its attitudes towards its people and the rest of the world. â€Å"Putting people first† ideals have become the leading factors of the Chinese revolution at the end of the 20th century. Ultimately, â€Å"putting people first† marked the Chinese authorities’ willingness to innovate, stimulate, and learn from their own mistakes. Conclusion â€Å"Putting people first† was the distinctive feature of the Chinese economic revolution throughout the last five decades. China was able to embrace the benefits of Maoist communism and market openness in a way that benefited the nation, and primarily, its people. Regardless whether China was following the economic ideals of equal distribution and industrialization, or whether the country was adapting to the new market order, people were the central elements of the Chinese political ideals; and â€Å"putting people first† is the most appropriate and the most reasonable perspective that can be used to analyze and evaluate Chinese way to economic and social prosperity.

The Ethical Codes Of Public Relations - 1106 Words

Public relations practice has had a long history in which the question of appropriate ethics has been at the centre of its evolution into a profession. This essay will argue that improved ethics over time has changed the public relations profession for the better, but that there are still further considerations of ethnicity. Firstly, the earlier stages of the public relations practice, which saw unethical, manipulative behaviour give way to a new outlook of transparency, will be explored. It will then outline public relations evolution from practice to profession through the Two-Way Asymmetric model to the Two-Way Symmetric model. Lastly, the ethical codes that underpin the public relations profession and how they can be improved will be†¦show more content†¦2007, p. 24). Lee understood that publicity on its own was not enough to ‘†¦influence the public†¦Ã¢â‚¬â„¢, that it needed to be ‘†¦supported by good works.’ (Lattimore et al. 2007, p. 2 4) and is credited with ‘†¦put(ing) public relations on the right track†¦Ã¢â‚¬â„¢ (Lattimore et al. 2007, p. 30). Heath (2001, p. 3) outlines how public relations began to embrace ‘†¦mutually beneficial relationships.’, which allowed for a better paradigm where markets are easier to obtain and organisations are given ‘†¦a license to operate.’. Health (2001, p. 6) states that the public relations practise could not control publics, which resulted in new ‘†¦strategies that foster trust and build community.’, where ‘(d)ialogue replaces monologue...’. Lee (citied in Newsom et al. 2013, p. 33) outline this shift in atitude wrinting that ‘ ‘(t)he relationship of a company to the people †¦ involves far more that saying-it involves doing.’ ‘. Despite Lee’s reputation for change to public relations practice, he also found disgrace after connections to Germany’s Nazi Party were investigated (Lattimore et al. 2007, p. 24), as well ‘†¦his support of Stalin-era Soviet Russia†¦Ã¢â‚¬â„¢ (Newsom et al. 2013, p. 33). The earliest era of public relations practise was defined by unethical behaviour which lead to changes that placed transparency andShow MoreRelatedEssay on Codes of Practice1513 Words   |  7 Pagesof living. There are people that view values as a personal code, and see them as a personal indication of their beliefs. Our professional values and ethics come from many different sources. In our childhood, our parents and peers are instrumental in the development of our values and ethics. As we enter the workforce we align with our ethical values to our employers, their values are shown through a company’s codes of practice. 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