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本文将扼要介绍物理学中对称性的分类及其特征,说明对称性破缺与一物理系统从无序到有序的相变过程间的关系,并讨论了对称性破缺出现的前提 相似文献
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利用间隙技术并靠一个专用模板,就能仅通过一次试验而对爆轰波面轮廓进行记录,辽河对其不同对称程度和旋转对称性加以详细分析. 相似文献
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合成了具有不同数目的对氨基苯基取代的卟吩衍生物,其中包括5-(对-氨苯基)-10,15,20-三苯基卟吩,5,10-二(对-氨苯基)-15,20-二苯基卟吩,5,15-二(对-氨苯基)-10,20-二苯基卟吩;5,10,15-三(对-氨苯基)-20-苯基卟吩和5,10,15,20-四(对-氨苯基)卟吩等,并对它们的电子吸收和发射光谱以及荧光寿命进行了测量,所得实验结果表明:由取代基引起的分子对称性的改变对它们的光谱和动态特性有一定的影响,分子对称性降低时,可使吸收振子强度增大和荧光衰变过程加速,这一效应对对称禁戒的A1g-B2u和A1g-B3u的电子跃迁的影响尤为显著,这一发现启发了人们,即使是和发色基相互作用不大的基团中的非对称取代也有可能使电子跃迁的对称性禁戒松弛。 相似文献
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利用SU(1,1)q,s量子代数的两参数变形振子构造出归一化的SU(1,1)q,s相干态,证明了SU(1,1)q,s量子代数的表示基是正交的,并讨论了它的相干态的归一性和完备性。指出(SU(1,1)q,s相干态的相干性受参数q、s的影响。 相似文献
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《Journal of Nonlinear Mathematical Physics》2013,20(3):300-317
Billiard systems within quadrics, playing the role of discrete analogues of geodesics on ellipsoids, are incorporated into the theory of integrable quad-graphs. An initial observation is that the Six-pointed star theorem, as the operational consistency for the billiard algebra, is equivalent to an integrability condition of a line congruence. A new notion of the double reflection nets as a subclass of dual Darboux nets associated with pencils of quadrics is introduced, basic properties and several examples are presented. Corresponding Yang–Baxter maps, associated with pencils of quadrics are defined and discussed. 相似文献
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On the basis of the straton model[1],using the general groundstate wave functionsof mesons and baryons given in ref.[2],we have constructed under some specific as-sumptions the meson and baryon wave functions without SU6 symmetry.We applythese wave functions to explain the mesonic and baryonic properties of the electroma-gnetic and weak interactions;many results obtained are in agreement with the experi-ments.By using the 1/2+-baryon wave functions without SU6 symmetry,we obtain ananomalous magnetic moment for the proton.There is no need to introduce an ano-malous magnetic moment for the straton in the effective Hamiltonian of electromag-netic interaction between stratons.Similarly,the magnetic moment of the neutroncan also be explained. 相似文献
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量子线,量子点和它们的激光器 总被引:2,自引:0,他引:2
介绍了半导体量子线、量子点的自组织生长法和掩膜表面选择局部生长法,讨论了量子线、量子点激光器的优点以及遇到的问题,指出了大小均匀性是实现量子线、量子点激光器的主要障碍. 相似文献
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《光谱学快报》2013,46(3):377-413
ABSTRACT The thiazolylazo compounds and their Co(II), Ni(II) and Cu(II) complexes of barbituric acid, uracil, thiouracil, citrazinic acid, chromotropic acid, gallic acid, pyrogallol and salicylic acid were prepared and characterized by 1H NMR, IR and the effect of pH on the electronic absorption spectra. The mode of ionization, the electronic transitions and the dissociation constants were discussed. The stoichiometries of the complexes were of 1:1, 2:1 and 3:2 (M:L). The copper complexes are of isotropic ESR spectra (except that of gallic acid which showed a complicated one) and are of magnetically diluted behaviour with orbital contribution. Detailed DTA data were obtained and discussed. 相似文献
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我们用膨胀计方法,在温度0—300℃的范围内,测定了液体金属钠、钾以及它们的合金NaK三种样品的密度。所用金属的纯度约在三个九以上,结果表明,所测液体金属及其合金的密度可作为温度的线性函数来表示,但NaK合金的(d,t)直线在接近冰点地方偏离直线上翘。 相似文献
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平均键能模型是一种建立在数值基础上的用来确定半导体异质界面能带偏移的模型方法。本文首先对这一模型方法的物理基础进行了理论分析,并给予其完整的物理解释。通过与TB“pinned”模型、介电隙能级(DME)模型以及电中性点(CNP)模型的比较,揭示了各模型之间的相互关系,并分析了平均键能模型的优点及其局限性。在此基础上,本文应用这一模型方法对二十七种异质界面的价带偏移值进行了全面的计算,并对结果进行了广泛的分析和比较。结果表明:(1)阳离子浅d轨道是影响价带偏移理论值的一个重要因素;(2)界面偶极子势是决定异质界面价带偏移值的一个关键要素;(3)在与实验的比较上,平均键能模型的准确性优于几种其它的模型方法;(4)平均键能模型不适用于不具有sp3杂化特性的材料系统。 相似文献
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本文综述了腔内单原子的激光冷却、囚禁与操控的基本原理、实验方案和结果及其最新进展,并介绍了腔内单原子激光操控实验的最新进展及其在腔内量子电动力学(腔内QED)效应、亚泊松光子统计、单原子激光、量子态制备、单光子源和量子信息处理等研究中的应用。 相似文献
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Based upon the properties of the characteristic classes and their Chern-Simons secondary characteristic classes. the "Abelian" anomalies in M2n+2,the Euler-Heisenberq effective actions in M2n+1, as well as the non-Abelian anomalies in M2n for arbitrary gauge gzoup and its reduction subgroup have been investigated thoroughly and the application to the gravitational anomalies is made. It is shown that the "Ahelian" anomalies of such groups are equal to each other, their Eu1er-Xeisenberg actions are also closely related to each, other,and their non-Abelian anomalies are also equivalent if their common generating functional can be taken as a counter-term.For the gravitational anomalies we present the common genera- ting functional for both non-Abelian Einstein and Lorentz anomalies M4n+2 and show the relationship between them. 相似文献
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