排序方式: 共有74条查询结果,搜索用时 15 毫秒
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极大子群的性质对有限群结构的影响 总被引:1,自引:0,他引:1
设H为有限群G的一个子群。称H在G中是s-半正规的,若对任意的素数p||G|,只要(p,|H|)=1,就有PH=HP,其中P∈Sylp(G);称H在G中是c-可补的,若存在G的子群N,使得G=HN且H∩N≤HG=CoreG(H)。证明了下面定理设F是一个包含超可解群类U的饱和群系,H△G,且G/H∈F。则G∈F,若下列条件之一成 相似文献
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高能粒子(沟道)传输时, 粒子质量与入射能量有关。 低能粒子(沟道)传输时, 粒子(静止)质量与入射能量无关。 与其说高低能量区别, 不如说质量观念区别; 因此两者研究是不同观念的研究。 沟道连续势阱的柱状对称性与碳纳米管结构的变化无关。 X射线(沟道)传输表现为两方面: 在波动性方面, 它遵守光学散射规律; 在粒子性方面, 它被沟道连续势阱束缚。 For high energy particle transmission, its mass depends on its incident energy. For low energy particle transmission, its (static) mass is independent of its incident energy. The difference between the mass ideas is rather than that between high and low energies. Thus, these two transmission studies are very different in ideas. The column symmetry of transverse continuum potential well is independent of the nanotube structure. X ray transmission consists of two aspects: as wave, it is scattered by the laws of ray optics; as particle, it is captured in the transverse continuum potential well. 相似文献
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回顾了对远离β稳定线奇特核性质的理论研究现状,并用相对论平均场理论研究了远离β稳定线奇特核的性质.包括轻核的中子晕和质子晕、远离β稳定线核的壳效应和超重核的性质等.The present situation of studies on exotic nuclei far from the β stable line is simply reviewed and then the relativistic mean field study on these nuclei has been carried out. This includes studies on neutron halos and proton halos in light nuclei, on nuclear shell effects of nuclei far from the stability, and on the properties of superheavy nuclei. 相似文献
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The interactions between relativistic electrons in a hot plasma are analysed theoretically. By splitting the electron density fluctuations into the individual part and the collective part, we are concerned with the collective oscillation of the relativistic electrons resulting from the Coulomb interactions. Consequently, we derive the frequency of the hot plasma and the “Debye length“ with relativistic modification. 相似文献
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固态多环芳烃化合物的THz时域光谱研究 总被引:3,自引:0,他引:3
利用太赫兹时域光谱技术室温下对芳烃化合物萘、联苯、葸、α-萘酚和β-萘酚在3-73cm^-1(0.1.2.2THz)频谱范围内进行了光谱测量。结果表明,多环芳烃化合物在此波段有不同的吸收特征。不能形成氢键的萘、联苯和蒽在67cm^-1(2.0THz)附近均有一吸收峰,这可能是由于分子之间的振动即晶格振动所引起的;而能够形成氢键的口一萘酚和卢.萘酚,其吸收峰可归结于分子间氢键的相互作用所引起的集体振动模式。1Hz时域光谱不仅能够鉴别分子结构存在微小差别的化合物而且还能鉴别同分异构体。 相似文献
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用高分辨透射电子显微镜(HRTEM)检查连续波CO_2激光束(波长10.6 μm, 功率300 W)辐照石墨后发现,不但有通常所见的碳纳米多面体(polyhedrons), 纳米洋葱(onions)和纳米管,而且也罕见的腔内充填大小不等空心洋葱(hollow onions, HOs)的碳纳米袋(nano-bags)。同时,在纳米袋中一些结构相似的碳 HO聚生成为HO团簇。根据这些团簇的排布情况,我们认为这种聚生物有可能是HO结 晶晶格生长的前体(precursor)。 相似文献
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微管管壁上的原丝纤维可以描述成各项异性的二维赝自旋模型,其最小重复单元是三角形状的。在这个模型中存在三种不同的“自旋-自旋”相互作用。而每一维上的自由电子可以看作是赝自旋模型。那么,微管壁上的量子信息传递就可以用Lylod提出的激光控制量子计算的模型来解释。Microtubule (MT) is described as an anisotropic two-dimensional pseudo-spin model on a triangular lattice, in which there are three different "spin-spin" interactions. The mobile electron in each lattice site is described based on the pseudo-spin model. Then, the processing of quantum information in the MT wall is presented by virtue of the scheme of driving quantum computer in sequence of laser pulse developed by Lloyd. 相似文献
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