Vortex dynamics during N–S and S–N transitions of Y–Ba–Cu–O superconductors under the effect of temperature gradient and thermal cycling

1997 ◽  
Vol 12 (11) ◽  
pp. 3090-3098 ◽  
Author(s):  
I. Kirschner ◽  
A. C. Bódi ◽  
R. Laiho ◽  
L. Lähderanta
Keyword(s):  
Temperature Gradient ◽  
Physical Environment ◽  
Variable Temperature ◽  
Ac Susceptibility ◽  
Vortex Motion ◽  
Effect Of Temperature ◽  
One Dimensional ◽  
Nonequilibrium Temperature ◽  
The One ◽  
Flux Expulsion

AC susceptibility of ac has been measured simultaneously in three different ranges of Y–Ba–Cu –O ceramic samples in the presence of a large and variable temperature gradient. The results obtained for normal-superconducting or superconducting-normal transitions under the effect of the one-dimensional nonequilibrium temperature distribution reveal the vortex motion to consist of not only conventional flux expulsion (or flux penetration), but flux exchange too, appearing between different ranges of samples and between samples and their close physical environment. The thermal cycles are shown to represent a supplementary heat treatment, increasing the homogeneity of the sample and decreasing the pinning, which accelerate the process of vortex motion.

The effect of temperature on adsorption of organic compounds to soils

2001 ◽  
Vol 38 (1) ◽  
pp. 46-52 ◽  
Author(s):  
Brent E Sleep ◽  
Paul D McClure
Keyword(s):  
Rate Constants ◽  
Organic Soil ◽  
Hot Water ◽  
Effect Of Temperature ◽  
Column Experiments ◽  
Sorption Rate ◽  
One Dimensional ◽  
Gamma Distributions ◽  
Nonequilibrium Temperature ◽  
Thermal Remediation

Column experiments were performed at 22–25°, 50°, and 92°C to study the effect of temperature on the sorption of toluene, perchloroethylene, and naphthalene to a silty gravel-till aquifer material. A one-dimensional numerical model incorporating kinetic adsorption with gamma-distributed rate constants was developed and fit to the data. As temperature was increased from 22–25° to 90°C, sorption coefficients decreased by 35, 40, and 60% for toluene, perchloroethylene, and naphthalene, respectively. The means and variances of the gamma distributions for sorption rate constants both increased as temperature increased. The increases in variance were attributed to the short contact times of the experiments and the increased sorption rates at higher temperatures. The decreases in sorption coefficients and increases in sorption rate constants as temperature is increased suggest that thermal remediation techniques such as hot-water and steam flushing may accelerate the removal of sorbed organic soil contamination.Key words: sorption, nonequilibrium, temperature dependence, thermal remediation.

scholarly journals Формирование регулярных слоистых структур при твердотельных фазовых переходах с изменением концентрации

2020 ◽  
Vol 62 (8) ◽  
pp. 1244
Author(s):  
А.А. Чеврычкина ◽  
Н.М. Бессонов ◽  
А.Л. Корженевский
Keyword(s):  
Phase Transition ◽  
Solid State ◽  
Temperature Gradient ◽  
Capillary Wave ◽  
Wave Model ◽  
The Self ◽  
One Dimensional ◽  
The One

The self-oscillation dynamic of an interface is calculated in the framework of the one-dimensional capillary-wave model. The parameters of a periodic layered impurity microstructure are obtained. This microstructure arises as a result of a solid-state phase transition with a change in concentration that occurs when a moving temperature gradient is applied.

Exact Solution for One-Dimensional Acoustic Fields in Ducts With Polynomial Mean Temperature Profiles

1998 ◽  
Vol 120 (4) ◽  
pp. 965-969 ◽  
Author(s):  
B. Manoj Kumar ◽  
R. I. Sujith
Keyword(s):  
Temperature Gradient ◽  
Sound Propagation ◽  
Temperature Profiles ◽  
Mean Flow ◽  
Wave Tube ◽  
One Dimensional ◽  
Mean Temperature ◽  
Quarter Wave ◽  
The One ◽  
Dimensional Wave

The purpose of this paper is to present closed form expressions for sound propagation in ducts with polynomial mean temperature profiles. It is shown that using appropriate transformations, the one-dimensional wave equation for ducts with an axial mean temperature gradient can be reduced to a standard differential equation whose form depends upon the specific mean temperature profile in the duct. The solutions are obtained in terms of Bessel and Neumann functions. The analysis neglects the effects of mean flow and therefore the solutions obtained are valid only for mean mach numbers that are less than 0.1. The developed solution is used to investigate the sound propagation in a quarter wave tube with an axial mean temperature gradient. The expressions for the four pole parameters are also presented.

Nucleation of Disorder in Fe3Al Alloys

1967 ◽  
Vol 25 ◽  
pp. 312-313
Author(s):  
P. R. Swann ◽  
W. R. Duff ◽  
R. M. Fisher
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Annealing Temperature ◽  
Antiphase Domain ◽  
Effect Of Temperature ◽  
Domain Structures ◽  
Transmission Electron ◽  
Domain Boundaries ◽  
Higher Temperature ◽  
The One

Recently we have investigated the phase equilibria and antiphase domain structures of Fe-Al alloys containing from 18 to 50 at.% Al by transmission electron microscopy and Mössbauer techniques. This study has revealed that none of the published phase diagrams are correct, although the one proposed by Rimlinger agrees most closely with our results to be published separately. In this paper observations by transmission electron microscopy relating to the nucleation of disorder in Fe-24% Al will be described. Figure 1 shows the structure after heating this alloy to 776.6°C and quenching. The white areas are B2 micro-domains corresponding to regions of disorder which form at the annealing temperature and re-order during the quench. By examining specimens heated in a temperature gradient of 2°C/cm it is possible to determine the effect of temperature on the disordering reaction very precisely. It was found that disorder begins at existing antiphase domain boundaries but that at a slightly higher temperature (1°C) it also occurs by homogeneous nucleation within the domains. A small (∼ .01°C) further increase in temperature caused these micro-domains to completely fill the specimen.

Exploring the Multidimensional Facets of Authoritarianism: Authoritarian Aggression and Social Dominance Orientation

2008 ◽  
Vol 67 (1) ◽  
pp. 51-60 ◽  
Author(s):  
Stefano Passini
Keyword(s):  
Social Dominance ◽  
Factor Model ◽  
Three Dimensional ◽  
Social Dominance Orientation ◽  
Model Fit ◽  
Regression Analyses ◽  
One Dimensional ◽  
Confirmatory Factor ◽  
The One ◽  
Better Than

The relation between authoritarianism and social dominance orientation was analyzed, with authoritarianism measured using a three-dimensional scale. The implicit multidimensional structure (authoritarian submission, conventionalism, authoritarian aggression) of Altemeyer’s (1981, 1988) conceptualization of authoritarianism is inconsistent with its one-dimensional methodological operationalization. The dimensionality of authoritarianism was investigated using confirmatory factor analysis in a sample of 713 university students. As hypothesized, the three-factor model fit the data significantly better than the one-factor model. Regression analyses revealed that only authoritarian aggression was related to social dominance orientation. That is, only intolerance of deviance was related to high social dominance, whereas submissiveness was not.

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