共查询到20条相似文献,搜索用时 942 毫秒
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用双参数量子群Uqp(u2)理论模型公式对A~190区47条超形变(SD)转动带进行了系统分析.计算得到的Eγ跃迁谱与实验较好地吻合;按转动带自旋指定的3种方案确定194Hg(1),194Pb(1)的带首自旋,结果与实验一致.此外,进一步讨论了核软度参数σ1的物理意义,发现一对旋称对偶带的σ1几乎全等. 相似文献
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简述了超形变原子核全同带的研究进展情况,并以Bohr-Mottelson的I(I+1)展开转动谱公式对部分典型的超形变带进行了分析.发现所谓全同带的确只是两个带的J(2)比较接近,它们的J(1)和J0并不相等,而且signature对偶带更接近全同. 相似文献
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利用148Nd(9Be, 5n)152Gd重离子熔合蒸发反应, 对152Gd(Z=64, N=88)核的高自旋态进行了研究. 在152Gd核中发现了10多个新的高自旋能级和一个新的S带结构. 实验中首次观察到152Gd核完整的第一个带交叉, 与推转壳模型计算结果和邻近核实验结果的比较显示带交叉是由一对i13/2中子的顺排造成的. 通过对152Gd核运动学转动惯量的分析, 得到152Gd核的形状随着自旋变化的实验证据. 相似文献
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利用q变形转动惯量的转子模型,系统地计算了148Gd核6个超形变带的E2r跃迁能谱以及相应的动力学转动惯量随转动频率的变化关系.计算结果表明,q变形转动惯量的转子模型不仅能较精确地描述超形变晕带,而且可以描述超形变激发带. 相似文献
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根据最新的Cs2分子中间态A1∑+u -b3Πu全局解微扰获得的能级数据, 归属了通过微扰增强红外-红外光学双共振中间态A1∑+u 到上态23△1g的140条碰撞线, 包含之前实验观测到的221条23△1g←A1∑+u← X1∑+g 双共振跃迁[J. Chem. Phys. 128, 204313 (2008)], 重新计算了23△1g态的分子常数和势能曲线(排除54个微扰能级). 本次拟合得到的离心畸变常数和从经验公式计算得到的值相符合. 在亚多普勒激发光谱中,没有分辨出23△1g态的超精细结构. 对23△1g态的超精细结构进行初步计算,比较实验结果给出解释和说明. 相似文献
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Theoretical analysis of the influence of flexoelectric effect on the defect site in nematic inversion walls 下载免费PDF全文
Based on the experimental phenomena of flexoelectric response at defect sites in nematic inversion walls conducted by Kumar et al., we gave the theoretical analysis using the Frank elastic theory. When a direct-current electric field normal to the plane of the substrate is applied to the parallel aligned nematic liquid crystal cell with weak anchoring, the rotation of ± 1 defects in the narrow inversion walls can be exhibited. The free energy of liquid crystal molecules around the +1 and-1 defect sites in the nematic inversion walls under the electric field was formulated and the electric-field-driven structural changes at the defect site characterized by polar and azimuthal angles of the local director were simulated. The results reveal that the deviation of azimuthal angle induced by flexoelectric effect are consistent with the switching of extinction brushes at the +1 and-1 defects obtained in the experiment conducted by Kumar et al. 相似文献
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Cholesteryl acetate and cholesteryl chloroformate compounds have been irradiated with 60Co-γ rays at room temperatures. The irradiated samples have been examined for paramagnetic resonance, and the observed spectra in several cases have been identified with specific radicals. The results in each case have been considered in relation to the present knowledge of the radiation chemistry of the compound. The single crystals have been investigated between 120 and 300?K. The spectra are found to be temperature independent and radiation damage centers are attributed to ?HCH2 radical for cholesteryl acetate and ?H3 and ?HCH2 CH2 CH2 radicals for cholesteryl chloroformate. 相似文献
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A phase transition at T r = 365±10K is shown for Pb9Al2F24 by high-temperature X-ray diffraction, microcalorimetric and electrical measurements. The AC conductivity data of Pb9Al2F24 are analyzed in the Z*, M* and ε* formalisms and the conductivity relaxation parameters are determined. The high-temperature form of Pb9Al2F24 is characterized by an activation energy (Δσ)h.t. close to that of the (x = 0.12) limiting composition of the Pb1-.xAlxF2 2+x solid solution with fluorite-type structure. 相似文献
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E. F. Skelton A. W. Webb S. B. Qadri E. R. Carpenter Jr. M. Z. Harford P. Lubitz 《高压研究》2013,33(1-6):914-916
Abstract The objectives of this work are two fold: (1) to study the effect of using oxygen-acetylene flame grown synthetic diamond as seed crystals for the high pressure-high temperature conversion of graphite into diamond and (2) to demonstrate the ability to produce small crystallites of diamond by a simple, electron beam evaporation technique. In each case, the production of diamond from graphite was confirmed. 相似文献
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C. M. Bartle 《辐射效应与固体损伤》2013,168(1-4):331-335
Angular distributions have been measured for the 6Li(n, t)4 He reaction using pulse height spectra in 6LiI(Eu). 相似文献
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从结合能实验值提取n-p相互作用能εip-jn,系统比较了奇奇核单质子单中子相互作用能ε1p-1n与相邻奇A核相应量的平均值,发现前者普遍大于后者.提出奇奇核n-p增强的解释为,GMshift效应和同类核子对关联对奇A核n-p相互作用的削弱效应.同时指出,奇质子核的ε1p-2n相当好地近似等于同质量数奇中子核的ε2p-1n,并且这与Garvey-Kelson关系是等价的. 相似文献
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In this paper we give a generalized form of the Schrödinger equation in the relativistic case, which contains a generalization of the Klein-Gordon equation. By complex Legendre transformation, the complex Lagrangian of electrodynamics produces a complex relativistic Hamiltonian H of electrodynamics, on the holomorphic cotangent bundle T′* M. By a special quantization process, a relativistic time dependent Schrödinger equation, in the adapted frames of (T′* M, H) is obtained. This generalized Schrödinger equation can be expressed with respect to the Laplace operator of the complex Hamilton space (T′*M, H). Finally, under some additional conditions on the proper time s of the complex space-time M and the time parameter t along the quantum state, by the method of separation of variables, we obtain two classes of solutions for the Schrödinger equation, one for the weakly gravitational complex curved space M, and the second in the complex space-time with Schwarzschild metric. 相似文献
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Soot and NO emissions are considered as major pollutants to the atmosphere from compression ignition engines. Researchers have been dedicated to the reduction of soot and NO emissions. Thus, an advance combustion regime, i.e. reactivity controlled compression ignition (RCCI), was proposed to mitigate the formation of these emissions. In this study, the dynamic ?-T (equivalence ratio vs. temperature) map analysis was applied to visualise the combustion processes associated with the in-cylinder temperature and equivalence ratio in an RCCI engine. Therefore, the soot and NO emissions can be efficiently reduced by controlling the combustion process out of the emissions islands on the ?-T map. This analysis method employs KIVA4-CHEMKIN and SENKIN code to construct ?-T maps under various conditions. To find out the significant parameters of controlling combustion process and emissions formation, four parameters were taken into consideration in a natural gas (NG) and diesel fuelled RCCI engine: NG percentage, the first start of injection (SOI) timing, split fraction of diesel and exhaust gas recirculation (EGR) rate. Each parameter was varied at three levels. Finally, the ?-T maps and final soot and NO emissions were compared among varied conditions for each parameter. It is found that the increased NG percentage can significantly reduce soot because of the absence of C-C bond in NG and the reduced diesel fuel impingement on the surface of the piston or cylinder wall. Increasing EGR can decrease the peak combustion temperature due to the dilution effect and thermal effect, consequently maintaining RCCI at low temperature combustion region. This study also indicates that dynamic ?-T map analysis is efficient at manipulating the combustion process to mitigate the soot and NO emissions formation. 相似文献