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化学教学里培养能力的几个理论问题初探 总被引:1,自引:0,他引:1
一年来,我国化学教育工作者对培养能力、提高化学教学质量十分重视。这里就化学教学中培养什么能力、培养能力的依据和做法等方面的几个理论问题谈一些我们的粗浅看法。 相似文献
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Interface dipole induced by asymmetric exchange effect in Mott-insulator/Mott-insulator heterojunction 下载免费PDF全文
We study theoretically the interfacial electronic property of a
heterojunction made from two Mott insulators (MI) with different
magnetic structures. By means of unrestricted Hartree-Fock
calculations in real space, we find that a charge dipole can form
spontaneously near the interface of the MI/MI heterojunction. The
magnitude of this charge dipole depends strongly on the magnetic
states of both sides of the heterojunction. Combining with the
result from an exactly solvable two-site toy model, we argue that
the interface dipole arises from exchange effects as well as its
asymmetry intrinsic to the heterojunction near the interface. Our
study may shed light on the fabrication of ultrathin ferroelectric
and magnetoelectric devices. 相似文献
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