Download After the breakthrough: The emergence of high-temperature by Helga Nowotny PDF

By Helga Nowotny

The invention of high-temperature superconductivity used to be hailed as a tremendous clinical step forward, inducing an exceptional wave of pleasure and expectation one of the clinical group and within the overseas press. This publication units this learn step forward in context, and reconstructs the heritage of the invention. The authors examine the emergence of this new learn box and how its improvement used to be formed by means of scientists and technology coverage makers. additionally they research a few of the institutional and nationwide settings during which the examine was once undertaken in addition to contemplating the medical backgrounds and motivations of researchers who entered the sector following the unique discovery.

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Extra resources for After the breakthrough: The emergence of high-temperature superconductivity

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Represents the Bragg order. 3. - 72a) there occur characteristic phenomena called Bragg effects. In analogy to solid state physics, the categories a) and E) are namedforbidden zones or forbidden frequency ranges. In these ranges the oscillation of the oscillator is either amplified or damped by the modulation with the circular frequency w depending on the phase lag between oscillation and modulation, respectively the initial conditions. 3 - 71b) the circular frequencies COp of these oscillations are multiples of the Bragg circular frequency % 52 k = 0, 1,2,3, ClJp ; n = 0, ± 1, ±2, ...

3 - 3) form a basis of the general solution if they are linearly independent. 3 -1) is either always zero, positive or negative. 3 - 12) For illustration we consider the harmonie oseillator with O(t) =0 and r(t) = 00. 3 - 1). 3 - 16) e) Initial value problems and propagator matrices In many cases the main interest is in motions of an oscillator that occur for given initial conditions. These conditions may be the initial values of the variable x(t) and its time derivative x{t) at time t = O. 3 - 1) are continuous, then there exists at most one solution x(t) which fulfills the initial conditions x(O) = Xo and X(O) = xo.

G. devided into equal intervals t n+1 - t n = M. 3 - 52a-c). 7d. 3 - 46c). The oscillations u(t) of this oscillator can be determined with the aid of propagators by taking into account that a) for times be applied. 2 - 20a-c) of the simple harmonie oscillator can ß) the intervals from tk - bt to tk + bt where bt > 0 are extremely short and therefore need special attention. Consequently, these intervals are assigned specific propagators p(t k - 8t, t k + 8t) which can be calculated as folIows: For simplicity one first assumes t n = O.

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