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Temperature Dependence of Polarizability and Dispersion in Three,Two and One Dimensional Electron Gases
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作者 燕保荣 孔令华 +1 位作者 吕建红 胡希伟 《Plasma Science and Technology》 SCIE EI CAS CSCD 2009年第5期515-520,共6页
Both temperature dependence of polarizability and plasmon dispersion in unmagnetized metal (or semiconductor) electron gases are investigated in this paper. It is obtained that, with a continuous variation of temper... Both temperature dependence of polarizability and plasmon dispersion in unmagnetized metal (or semiconductor) electron gases are investigated in this paper. It is obtained that, with a continuous variation of temperature in a large region, the polarizability and dispersion change non-monotonously. The static polarizability X(q, w =0, μ, T) and dispersion wp(q, T) for finite T in three, two and one dimensional electron gases are calculated numerically. In addition, dispersion relation w(q) at a definite temperature (T ≠0) is similar to that at T = 0. 展开更多
关键词 POLARIZABILITY plasmon dispersion two dimensional electron gas temperaturedependence
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锌负极和锂负极在不同温度下的电化学行为
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作者 李清 洪虎 +11 位作者 郭寻 朱家雄 侯越 刘超 汪冬红 梁国进 赵玉伟 陈奥 李洪飞 董斌斌 李宝华 支春义 《Science Bulletin》 SCIE EI CAS CSCD 2023年第10期998-1007,M0003,共11页
本文研究表明锂金属负极的枝晶问题在较低温度下会加剧,在较高温度下会受到抑制;而对于水系可充电锌基电池中锌金属负极的枝晶演变,温度的影响则恰恰相反.对两种负极的电化学行为的研究结果表明,界面反应速率和离子扩散率的匹配程度以... 本文研究表明锂金属负极的枝晶问题在较低温度下会加剧,在较高温度下会受到抑制;而对于水系可充电锌基电池中锌金属负极的枝晶演变,温度的影响则恰恰相反.对两种负极的电化学行为的研究结果表明,界面反应速率和离子扩散率的匹配程度以及副反应综合影响了金属负极的枝晶生长和循环寿命.研究发现有机电解质和水电解质在上述影响因素上的不同性质导致相反的温度影响.本文进一步对混合电解质(有机和水性)进行了详细研究,以调节离子扩散率和副反应,同时扩大水系可充锌基电池的工作温度窗口.本文揭示了有机锂金属负极和水系锌基电池完全相反的温度影响,并揭示了潜在的影响机制,有助于加深对金属负极的理解,从而促进水系锌基电池的大规模应用. 展开更多
关键词 Zndendrites Metalanodes temperaturedependence Hybrid electrolytes
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Protein folding as a quantum transition between conformational states 被引量:7
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作者 罗辽复 《Frontiers of physics》 SCIE CSCD 2011年第1期133-140,共8页
Assuming that the main variables in the life processes at the molecular level are the conforma- tion of biological macromolecules and their frontier electrons a formalism of quantum theory on conformation-electron sys... Assuming that the main variables in the life processes at the molecular level are the conforma- tion of biological macromolecules and their frontier electrons a formalism of quantum theory on conformation-electron system is proposed. Based on the quantum theory of conformation-electron system, the protein folding is regarded as a quantum transition between torsion states on polypep- tide chain, and the folding rate is calculated by nonadiabatic operator method. The rate calculation is generalized to the case of frequency variation in folding. An analytical form of protein folding rate formula is obtained, which can be served as a useful tool for further studying protein folding. The application of the rate theory to explain the protein folding experiments is briefly summarized. It includes the inertial moment dependence of folding rate, the unified description of two-state and multistate protein folding, the relationship of folding and unfolding rates versus denaturant concen- tration, the distinction between exergonic and endergonic foldings, the ultrafast and the downhill folding viewed from quantum folding theory, and, finally, the temperature dependence of folding rate and the interpretation of its non-Arrhenius behaviors. All these studies support the view that the protein folding is essentially a quantum transition between conformational states. 展开更多
关键词 protein folding rate quantum transition torsion states non-Arrhenius temperaturedependence exergonic and endergonic folding ultrafast folding
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Seeing is believing: negative capacitance captured at both nano-and macro-scales
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作者 Yunya Liu Jiangyu Li 《Science Bulletin》 SCIE EI CAS CSCD 2019年第6期361-363,共3页
The phenomenological theory of ferroelectrics was developed by Landau-Devonshire about 70 years ago in the 1940s [1], and the celebrated theory has been very successful in analyzing ferroelectric phase transitions [2,... The phenomenological theory of ferroelectrics was developed by Landau-Devonshire about 70 years ago in the 1940s [1], and the celebrated theory has been very successful in analyzing ferroelectric phase transitions [2,3], domain structures [4], as well as strain engineering [5,6]. Recently, it has been demonstrated that it is also capable of capturing emerging polarization textures such as a ferroelectric vortex [7], proving its wide applicability not only at phenomenological level, but also at the atomic scale. The idea is simple, that the internal energy density of a ferroelectric depends on polarization, the order parameter, and upon the phase transition, the energy becomes degenerate, corresponding to multiple ferroelectric variants arising from broken symmetry. Such behavior is captured well by a polynomial of polarization with temperaturedependent coefficient, as Devonshire originally demonstrated for barium titanate [1]. 展开更多
关键词 PHENOMENOLOGICAL theory analyzing FERROELECTRIC temperaturedependent COEFFICIENT
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