Helga Nowotny's After the breakthrough: The emergence of high-temperature PDF

By Helga Nowotny

ISBN-10: 0521561248

ISBN-13: 9780521561242

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

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3. 2(b). 3. 1. 3 shows a condenser that has armatures carrying the charges +Q and –Q: The potential gradient is therefore only between the armatures that have a known surface area (S), outside of which the electric field can be considered zero. dS= E S (assuming that E and dS are collinear) 6 S Q VS H0 H0 where V is the superficial charge density at the electrodes, from which can be determined : E = V H0 . 3. Vacuum-based condenser. 2. 4. Dipole orientation: (a) without field and (b) with an applied field.

The frequency of E therefore must be below Q = 1/W | 5 x 1013 Hz , a frequency that corresponds to that of an electromagnetic wave with wavelength given by O = cW | 6 µm (infrared). As a consequence, Ohm's law is valid in metals for electrotechnical and radioelectrical frequencies but not optical frequencies where (Q | 1015 Hz) . 5. 18. Cross section of a current tube. Given a conductor with a cross section (dS) perpendicular to the current lines. The intensity of the current traversing dS is given by dI = j dS =V E dS , so that Chapter 1.

Comments Under a quasistationary regime, U varies with time but sufficiently little so that it G G wU  div j . Hence, once again div j= 0 (as found for can be assumed that wt sinusoidal currents at low frequencies). wU Under a rapidly varying regime, U varies rapidly with time, so that is wt G G no longer negligible with respect to div j . Therefore, j is no longer a conservative G wU flux but accords to div j  0 , and the current lines do not fold in on wt G G JJJG themselves. dS1 z constant, and after one cycle j S1 differs from that traversing S1.

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

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