共查询到18条相似文献,搜索用时 62 毫秒
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在大学物理教学内容中,势模型的教学是特别重要的.传统教材受到数学技术上的限制,使学生实际接触到的势模型寥寥无几,而数字化教学大大丰富了势模型问题的教学,在提高教学效益与质量上发挥了巨大的作用. 相似文献
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用计算机编程扩充物理势模型教学 总被引:1,自引:0,他引:1
本文阐述了势模型教学的重要意义 ,指出引入计算机方法 ,扩充大学物理教材中的势模型教学 ,对推动整个物理教学的改革将起着一个不容忽视的重要作用 ,它是当前教学改革有效的突破口之一 . 相似文献
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本文阐述了势模型教学的重要意义,指出引入计算机方法,扩充大学物理教材中的势模型教学对推动整个物理教学的改革将起着一个不容忽视的重要作用,它是当前教学改革有效的突破口之一。 相似文献
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Scattering formalisms which incorporate antisymmetrization of the projectile with respect to identical particles in the target
result in a nonsymmetric non-local interaction. Such an interaction constraints the relative wavefunctions to be orthogonal
to redundant states forbidden by the Pauli principle. Concentrating on the nonsymmetric non-local kernel of Saito we try to
visualize the mechanisms by which a potential can ensure the required orthogonality. We achieve this by replacing the Saito
kernel by an effective symmetric non-local potential. The constructed symmetric potential is found to be phase-equivalent
only but not off-shell equivalent to the original kernel. This difference in the off-shell behaviour is attributed to the
dynamical origin simulating the redundant states. In close analogy with one of our recent works we also derive an energy-momentum
dependent equivalent to the local potential. Our solution of the pseudo inverse problem is exact and provides a basis for
writing the phase—and quasiphase—equations. We present numerical results in support of this. 相似文献
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通过研究HOCl分子高激发振动态的动力学势, 明确了该体系的动力学特点. 研究表明, 在O-Cl伸缩模式和H-O-Cl弯曲模式间存在2:1 Fermi共振的动力学模型下, H-O伸缩振动模式对于上述两种振动模式的动力学势有显著影响, 且这种影响随Polyad数呈现有规律的变化. 作为定量研究, 还研究了Polyad数为24时该分子体系的动力学势与各能级的相空间轨迹. 分析表明, 相空间轨迹与动力学势中的动力学不动点有很好的对应关系. 此外, 将该Polyad数下的动力学势中的能级按照相空间轨迹的作用量积分进行分类, 明确了这些能级所处的量子环境. 相似文献
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利用超分子二阶到四阶多体微扰理论和扩展的相关一致基组(aug-cc-pVTZ)结合有效的中点键函数(3s3p2d1f1g)计算水二聚物的平衡结构和分子间相互作用势,并用平衡方法修正基组重叠误差.在MP2/aug-cc-pVTZ理论级别优化水二聚物几何构型.与正常优化的结果相比,平衡修正优化得到的RO-O和α值分别轻微的增加0.002 nm和0.19°,同时,θ值减小0.013°.在MP2水平利用扩展的相关一致基组结合有效键函数,预言了RO-O和ΔECP值分别为0.0923 nm和-4.86 kcal/mol,计算结果与实验值符合得很好.用exp-4.2势函数拟合分子间相互作用能的离散点,拟合结果与从头算计算的结果一致. 相似文献
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Using the Hugenholtz-Van Hove theorem, we derive general expressions for the quadratic and quartic symmetry energies in terms of the isoscalar and isovector parts of single-nucleon potentials in isospin asymmetric nuclear matter. These expressions are useful for gaining deeper insights into the microscopic origins of the uncertainties in our knowledge on nuclear symmetry energies especially at supra-saturation densities. As examples, the formalism is applied to two model single-nucleon potentials that are widely used in transport model simulations of heavy-ion reactions. 相似文献
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两块带电导体的相互作用能 总被引:2,自引:4,他引:2
导出了两块导体在给定电量,给定电势时和一块给定电量,另一块给定电势时,3种情况下的相互作用能公式,并从电磁场能量和导体有量两个角度来表示互作用能公式,指出带电导体之间的互作用能一般由电势能,导体带电状态改变做功和外电源提供的能量这3部分构成。 相似文献
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We consider the scattering problem for absorptive interactions within the framework of phase-function method. A Green’s function
approach is used to derive the phase equation. As a case study we apply the algorithm presented on a shallow α-α potential,
the real and imaginary parts of which have been deduced from experimental data. The real and imaginary parts of theS-wave phase shift are found to vary smoothly with energy while those forD andG waves show some fluctuations in the low-energy region. It is shown that studies in spatial behaviour of the phase function
provide a plausible explanation for the dynamical origin of these fluctuations. 相似文献
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We study the dynamical energy equipartition properties in the integrable Toda model with additional uniform or disordered on-site energies by extensive numerical simulations. The total energy is initially equidistributed among some of the lowest frequency linear modes. For the Toda model with uniform on-site potentials, the energy spectrum keeps its profile nearly unchanged in a relatively short time scale. On a much longer time scale, the energies of tail modes increase slowly with time. Energy equipartition is far away from being attached in our studied time scale. For the Toda model with disordered on-site potentials, the energy transfers continuously to the high frequency modes and eventually towards energy equipartition. We further perform a systematic study of the equipartition time teq depending on the energy density εand the nonlinear parameter α in the thermodynamic limit for the Toda model with disordered on-site potentials. We find teq∝(1/ε)~a(1/α)~b, where b ≈ 2 a. The values of a and b are increased when increasing the strengths of disordered on-site potentials or decreasing the number of initially excited modes. 相似文献
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用玻色化技术和高斯波泛函变分理论研究了电荷转移型Hubbard模型.通过自旋密度波和电荷密度波的位相结构的变化,并结合其相应能隙的变化,得到以下结论:系统的Ising相变与Mott相变不重合,中间有一个SDI(spontaneouslydimerizedinsulating)的过渡相.在BI(band-insulator)相,自旋密度波与电荷密度波都具有能隙,而在MI(Mott-insulator)相,电荷密度波具有能隙,自旋密度波没有能隙.
关键词:
Hubbard模型
电荷密度波
自旋密度波
相图 相似文献