Bardeen-Cooper-Schrieffer Theory of Superconductivity in the Case of Overlapping Bands

1959 ◽  
Vol 3 (12) ◽  
pp. 552-554 ◽  
Author(s):  
H. Suhl ◽  
B. T. Matthias ◽  
L. R. Walker
Keyword(s):  
Theory Of Superconductivity ◽  
Overlapping Bands

Ambiguity in the decreasing least-squares resolution of overlapping bands

1969 ◽  
Vol 10 (3) ◽  
pp. 326-329
Author(s):  
I. I. Antipova-Karataeva ◽  
S. F. Arkhipova ◽  
B. N. Grechushnikov
Keyword(s):  
Least Squares ◽  
Overlapping Bands

scholarly journals The surface impedance of superconductors and normal metals at high frequencies III. The relation between impedance and superconducting penetration depth

1947 ◽  
Vol 191 (1026) ◽  
pp. 399-415 ◽  
Keyword(s):  
Magnetic Field ◽  
Penetration Depth ◽  
Surface Impedance ◽  
Simple Extension ◽  
High Frequencies ◽  
Resistivity Measurements ◽  
Direct Measurements ◽  
Normal Metals ◽  
Velocity Of Propagation ◽  
Theory Of Superconductivity

The theory developed in II is extended to cover the case of a superconductor, and a formula is derived relating the r. f. resistivity to the superconducting penetration depth and other parameters of the metal. It is shown how the penetration depth may be deduced directly from measurements of the skin reactance, and a method of measuring reactance is described, based essentially on the variation of the velocity of propagation along a transmission line due to the reactance of the conductors. For technical reasons it is not convenient to measure the reactance absolutely, but a simple extension of the technique described in I enables the change in reactance to be accurately measured when superconductivity is destroyed by a magnetic field. The method has been applied to mercury and tin. In the former case the results are in agreement with Shoenberg’s direct measurements, and confirm that the penetration depth at 0° K is of the order of 7 x 10 –6 cm. The theory developed at the beginning of the paper is used to deduce the variation of penetration depth with temperature from the resistivity measurements of I, and it is shown that agreement with other determinations and with the reactance measurements is fairly good, but not perfect. Some of the assumptions used in developing the theory are critically discussed, and a qualitative account is given to show how Heisenberg’s theory of superconductivity offers an explanation of some of the salient features of superconductivity and inparticular indicates the relation between superconducting and normal electrons.

scholarly journals How price moderates assessments of coffee quality across profiles of gender and experience

2016 ◽  
Vol 47 (1) ◽  
pp. 49-60
Author(s):  
D. Priilaid ◽  
B. Horwitz
Keyword(s):  
Regression Models ◽  
Potential Cost ◽  
Ols Regression ◽  
Price Effects ◽  
Experienced Male ◽  
The Impact ◽  
Experienced Female ◽  
Method Show ◽  
Overlapping Bands

Proceeding from studies that identify the extrinsic price cue as a mediator between a product’s perceived and intrinsic merit, we report on a blind-versus-sighted coffee tasting experiment conducted to determine the impact of the price-cue across coffee-user categories of gender and relative experience. Seven instant coffees were tasted by 100 subjects producing 700 paired blind and sighted tastings. Aggregating the data, OLS regression models were run to estimate price-effects across discrete and overlapping bands of gender and self-confessed expertise (non-expert and expert). Our analysis reveals the extent to which price-effects demean a coffee’s intrinsic merit during sighted tastings, with experienced male coffee drinkers most especially susceptible to price persuasion, and less experienced female drinkers the least. Thus our paper introduces a cheap and affective means of testing for such cue-effects. Neuromarketing styles of testing are usually cumbersome, expensive and difficult to scale. The method show-cased here offers a meaningful alternative. These findings uphold the view that the price cue remains a critical tool in the marketing of coffee; most notably because of its potential cost-free contribution to the ramping of experienced pleasure without any augmentation of quality. Further implications are explored.

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