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介绍基于WEB的网络多媒体物理计算机辅助教学课件-《工科大学物理学习辅助导系统》的第二期工程的研制情况。 相似文献
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介绍基于WEB的网络多媒体物理计算机辅助教学课件--<工科大学物理学习辅导系统>的第二期工程的研制情况. 相似文献
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VARIATIONAL STUDY ON MISSING BOND-CHARGE REPULSION ON THE EXTENDED HUBBARD MODEL: EFFECTS ON POLYACETYLENE
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The variational approach is applied to the study on the effect of Coulomb interaction between electrons on the dimerization in a one-dimensional commensurability-two Peierls system, such as trans-polyacetylene. For the case of omitting direct repulsion between electrons in the bonds between sites W, it is confirmed that the weak interactions tend to enhance the dimerization; but when W is included, this enhancement will be attenuated. If |W| is sufficiently large, the net effect of electron-electron interactions will reduce the magnitude of the electron-phonon-induced dimerization. 相似文献