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For the theoretician such an asymmetry in the theoretical structure, with no corresponding 3 asymmetry in the system of experience, is intolerable.
If we assume the ether to be at rest relatively to K , but in motion relatively to K' , the physical equivalence of K and K' seems to me from the logical standpoint, not indeed downright incorrect, but nevertheless inacceptable. The next position which it was possible to take up in face of this state of things appeared to be the following. The ether does not exist at all. The electromagnetic fields are not states of a medium, and are not bound down to any bearer, but they are independent realities which are not reducible to anything else, exactly like the atoms of ponderable matter.
This conception suggests itself the more readily as, according to Lorentz's theory, electromagnetic radiation, like ponderable matter, brings impulse and energy with it, and as, according to the special theory of relativity, both matter and radiation are but special forms of distributed energy, ponderable mass losing its isolation and appearing as a special form of energy.
More careful reflection teaches us, however, that the special theory of relativity does not compel us to deny ether. We may assume the existence of an ether; only we must give up ascribing a definite state of motion to it, i.
We shall see later that this point of view, the conceivability of which I shall at once endeavour to make more intelligible by a somewhat halting comparison, is justified by the results of the general theory of relativity.
Think of waves on the surface of water.
Here we can describe two entirely different things. Either we may observe how the undulatory surface forming the boundary between water and air alters in the course of time; or else -- with the help of small floats, for instance -- we can observe how the position of the separate particles of water alters in the course of time.
If the existence of such floats for tracking the motion of the particles of a fluid were a fundamental impossibility in physics -- if, in fact, nothing else whatever were observable than the shape of the space occupied by the water as it varies in time, we should have no ground for the assumption that water consists of movable particles. But all the same we could characterise it as a medium. We have something like this in the electromagnetic field.
For we may picture the field to ourselves as consisting of lines of force. If we wish to interpret these lines of force to ourselves as something material in the ordinary sense, we are tempted to interpret the dynamic processes as motions of these lines of force, such that each separate line of force is tracked through the course of time. It is well known , however, that this way of regarding the electromagnetic field leads to contradictions.
Generalising we must say this: -- There may be supposed to be extended physical objects to which the idea of motion cannot be applied They may not be thought of as consisting of particles which allow themselves to be separately tracked through time.
In Minkowski 's idiom this is expressed as follows: -- Not every extended conformation in the four-dimensional world can be regarded as composed of world-threads. The special theory of relativity forbids us to assume the ether to consist of particles observable through time, but the hypothesis of ether in itself is not in 4 conflict with the special theory of relativity.
Only we must be on our guard against ascribing a state of motion to the ether.
Certainly, from the standpoint of the special theory of relativity, the ether hypothesis appears at first to be an empty hypothesis. In the equations of the electromagnetic field there occur, in addition to the densities of the electric charge, only the intensities of the field. The career of electromagnetic processes in vacuo appears to be completely determined by these equations, uninfluenced by other physical quantities. The electromagnetic fields appear as ultimate, irreducible realities, and at first it seems superfluous to postulate a homogeneous, isotropic ethermedium, and to envisage electromagnetic fields as states of this medium.
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But on the other hand there is a weighty argument to be adduced in favour of the ether hypothesis. To deny the ether is ultimately to assume that empty space has no physical qualities whatever.
The fundamental facts of mechanics do not harmonize with this view. For the mechanical behaviour of a corporeal system hovering freely in empty space depends not only on relative positions distances and relative velocities, but also on its state of rotation, which physically may be taken as a characteristic not appertaining to the system in itself.
In order to be able to look upon the rotation of the system, at: least formally, as something real, Newton objectivises space.
Since he classes his absolute space together with real things, for him rotation relative to an absolute space is also something real. Newton might no less well have called his absolute space "Ether"; what is essential is merely that besides observable objects, another thing, which is not perceptible, must be looked upon as real, to enable acceleration or rotation to be looked upon as something real.
It is true that Mach tried to avoid having to accept as real something which is not observable by endeavouring to substitute in mechanics a mean acceleration with reference to the totality of the masses in the universe in place of an acceleration with reference to absolute space. But inertial resistance opposed to relative acceleration of distant masses presupposes action at a distance; and as the modern physicist does not believe that he may accept this action at a distance, he comes back once more, if he follows Mach, to the ether, which has to serve as medium for the effects of inertia.
But this conception of the ether to which we are led by Mach's way of thinking differs essentially from the ether as conceived by Newton, by Fresnel, and by Lorentz. Mach's ether not only conditions the behaviour of inert masses, but is also conditioned in its state by them.
Mach's idea finds its full development in the ether of the general theory of relativity.
According to this theory the metrical qualities of the continuum of space-time differ in the environment of different points of space-time, and are partly conditioned by the matter existing outside of the territory under consideration. For more than decade one the keys that microsofts activation servers have relied unique which based hash your hardware. Stepby step instructions activate your license for.
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Waston-Gleaser and Torrence test methods were applied during those experiments. After the announcements were announced, chess was included in pilot schools in Pennsylvania as a course and the state education board prepared a chess education and development program. Between , Dr. Robert Ferguson prepared a project supported federally and named Critical and Creative Thinking to be Developed with the help of Chess.
There were students chosen from 7, 8 and 9th grade students. The independent variables were behavioral approach to chess, approach to technology and computers, and approach to non-chess subjects.
The study lasted for 32 weeks and in the first part, each group was given a course in specified event course. Watson-Glaser critical thinking test showed that there was a Chess group was clear first in every creativity tests including uniqueness.
CHESS - CIS - U Author - Academic Works on Chess
The fluent speaking abilities of chess students were much higher than the other groups. Another research conducted between was a studying Venezuela. Project of Learning How To Think was a project aiming to determine whether chess is positively influencing the intellectual level or not. In the light of the results, Venezuela included chess as part of national education curriculum.
The research is included in FIDE reports. In , Dianne Horgan conducted an experiment named Chess as a Tool of Learning and Teaching with 24 primary and 35 middle-high school students.
In the end, Horgan concluded that children can learn chess at earlier ages quite comfortably and chess would contribute to the development of the mind of the children.
William Levy in New Jersey State University Education Faculty conducted another study between and concluded that chess contributes to the self-esteem of students of every age group including university and college and positively influencing the decision-making processes of individuals.Author Topic: Waptrick lagu blink ini cinta.
Think of waves on the surface of water. Thus the endeavour toward a unified view of the nature of forces leads to the hypothesis of an ether. Show your support by donating any amount.
The research is included in FIDE reports. Albert Frank in which a total of 92 students between participated.