Aharonov-Bohm效应的验证

验证Ａ－Ｂ效应，是现代物理学中一个重大问题．它使量子理论受到严峻的考验，并使电磁场理论引起变革和发展．自从１９６０年对首次的实验结果有所争议以来，经过二十多年的探索，电磁矢势的Ａ－Ｂ效应终于获得确证．本文着重介绍这一验证的思想、方法和结果．     

热力学的拉格朗日函数

Ｐｌａｎｃｋ和Ｐａｕｌｉ提出了相对论热力学Ｌａｇｅａｎｇｅ函数的一促形式,本文表明：在不同的约束条件下,Ｌａｇｒａｎｇｅ函数的形式是不同的,它可以分别是内能、焓、Ｈｅｌｍｈｏｌｔｚ自由能、Ｇｉｂｂｓ函数、巨势等和负值;文中对该函数的相对论变换性质也进行了讨论。     

由正反夸克对产生模型导出的等效二介子交换势

从单胶子交换正反夸克对产生模型出发,计算了N-N相互作用中方盒图的等效两介子交换势,它随r的变化关系与唯象σ介子交换势随r的变化关系的趋势是一致的.     

在时谐电磁场中用矢量势A直接表达电场强度E的一个显式

根据麦克斯韦方程组和洛伦兹条件,对时谐变场e导出用矢量势A直接表达电场强度E的一个显式,并对它进行了讨论.     

在修改的r~2势下q~3P_0凝聚

对r2 型关联核的大r行为作了修改 ,使得它在小r区域变为r2 关联核 ,而在大r区域趋于一个常数A ,因此不再是绝对禁闭的 .通过计算 ,发现这种对大r行为的修改虽然能够使真空凝聚保持在r2 关联核下的主要性质 ,但它的影响仍然是显著的 .     

用计算机编程扩充物理势模型教学

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 .     

在修改的r2势下qq3P0凝聚

对r2型关联核的大r行为作了修改,使得它在小r区域变为r2关联核,而在大r区域趋于一个常数A,因此不再是绝对禁闭的.通过计算,发现这种对大r行为的修改虽然能够使真空凝聚保持在r2关联核下的主要性质,但它的影响仍然是显著的.     

在修改的r2势下qq3P0凝聚

对r²型关联核的大r行为作了修改,使得它在小r区域变为r²关联核,而在大r区域趋于一个常数A,因此不再是绝对禁闭的.通过计算,发现这种对大r行为的修改虽然能够使真空凝聚保持在r²关联核下的主要性质,但它的影响仍然是显著的.     

静磁多极系统的对称性群及谐波势

本文研究具有控制矢量的静磁多极系统,导出这多极系统的对称变换与其M函数诱导对称变换的关系,并建立一个严格、普遍的简单方法,以便从这多极系统的对称性群出发,导出它对谐波势的约束关系。 关键词：     

正弦平方势与正电子面沟道辐射的一般特征

引入正弦平方势，在经典力学框架内，将面沟道粒子的运动方程化为标准的摆方程，并用Jacobian椭圆函数和椭圆积分解析地给出系统的解和粒子运动周期，导出了正电子面沟道辐射的瞬时辐射强度、平均辐射强度和辐射谱特征.结果表明，沟道辐射频率己进入γ-能区，并指出了利用它作为短波长激光的可能性. 关键词： 沟道辐射 非线性 正弦平方势     

用能量自洽法研究异核双原子分子的势能曲线

用研究双原子分子解析势能函数的新方法——ECM方法进一步研究了一些异核双原子分子的电子基态和激发态：CIF分子的A３Π1和B0＋(３Π)态，CH分子的X２Π态，BH分子的X1Σ＋态，XeO分子的d1Σ＋态，LaF分子的X1Σ＋态，Li7D分子的X1Σ＋态，NaRb分子的X1Σ＋态，KRb分子的(2)3Σ＋和21Π态等.获得的势能曲线表明，ECM势能很好地符合Rydberg-Klein-Rees(RKR)值，得到了比Morse势，huxley-Murrell-Sorbie(HMS)势更令人满意的结果.而且在分子渐近区和分子离解区域，ECM方法还能得到RKR可能缺乏的可靠物理数据. 关键词： 能量自洽 双原子分子 势能函数 电子态     

Studies on the analytical potential energy function of diatomic molecular ion XY~+ using variational method

It is well-known that the accurate behavior of potential energy function of molecular ion plays an important role in the studies such as solution chemistry, atmosphere chemistry, nebular medium, plasma physics, and gun powder, etc.[1, 2]. The values of potential energy function of diatomic molecular ion could significantly influence the optical efficiency of laser pump using ion vapors as working substrate[3]. The ionic potential is very important for the studies on low-energy ion-atom collisi…     

用能量自洽法研究碱金属双原子分子的势能曲线

用能量自洽法(ECM)研究了碱金属双原子分子一些电子激发态的势能曲线：Na₂ 分子的2¹Π_g,4³Π_g和b³Π< sub>u电子激发态,K₂分子的a³Σ^＋_{u,2¹Πg,B¹Πu和A^{关键词： 能量自洽 双原子分子 势能 碱金属}}     

Studies on the analytical potential energy function of diatomic molecular ion XY<Superscript>+</Superscript> using variational method

A new analytical potential energy function for diatomic molecular ion XY⁺ is proposed based on the energy consistent method (ECM). The Coulomb potential included in the new ionic potential contains multipole corrections, converges quickly and is variationally, changeable. The new potential and the ECM are applied to variationally studying the potential energies of eight electronic states of several diatomic molecular ions: the A²π state of CO⁺, the X²∑_g⁺ state of Li₂⁺, the X²∑_g⁺ state of He₂⁺, the 1²∏_u state of Na₂⁺, the A²∏_u state of N₂⁺, the X¹∑⁺ state of KrH⁺, the X²∑⁺ state of SiO⁺ and the A²π state of SO⁺ ion. The present results agree excellently with the experiment-based Rydberg-Klein-Rees (RKR) potentials, and are superior to the commonly used Huxley-Murrell-Sorbie (HMS) analytical potentials, and are better in some cases than some quantum mechanicalab initio potentials in the ionic asymptotic and dissociation regions.     

Biochemical and anisotropical properties of tendons

Tendons are formed by dense connective tissue composed of an abundant extracellular matrix (ECM) that is constituted mainly of collagen molecules, which are organized into fibrils, fibers, fiber bundles and fascicles helicoidally arranged along the largest axis of the tendon. The biomechanical properties of tendons are directly related to the organization of the collagen molecules that aggregate to become a super-twisted cord. In addition to collagen, the ECM of tendons is composed of non-fibrillar components, such as proteoglycans and non-collagenous glycoproteins. The capacity of tendons to resist mechanical stress is directly related to the structural organization of the ECM. Collagen is a biopolymer and presents optical anisotropies, such as birefringence and linear dichroism, that are important optical properties in the characterization of the supramolecular organization of the fibers. The objective of this study was to present a review of the composition and organization of the ECM of tendons and to highlight the importance of the anisotropic optical properties in the study of alterations in the ECM.     

Biocompatibility of pure titanium modified by human endothelial cell-derived extracellular matrix

Extracellular matrix (ECM) used to modify biomaterial surface is a promising method for improving cardiovascular material hemocompatibility. In the present work, human umbilical vein endothelial cells (HUVECs) are cultured and native ECM is obtained on pure titanium surface. Fourier infrared spectrum (FTIR) test proves the existence of amide I and amide II band on the modified titanium surface. X-ray photoelectron spectroscopy (XPS) further confirms the chemical composition and binding types of the ECM proteins on the titanium substrate. The results of light microscopy and atomic force microscopy (AFM) exhibit the morphology of HUVEC derived ECM. There are higher water contact angles on the ECM modified samples. Furthermore, some ECM components, including fibronectin (FN), laminin (LN) and type IV collagen (IV-COL) are presented on ECM-covered titanium surface by immunofluorescence staining. The biological behavior of cultured HUVECs and adherent platelets on different samples are investigated by in vitro HUVECs culture and platelet adhesion. Cells exhibit better morphology and their proliferation ability greatly improve on the ECM-covered titanium. At the same time, the platelet adhesion and spreading are inhibited on ECM-covered titanium surface. These investigations demonstrate that ECM produced by HUVECs cannot only improve adhesion and proliferation ability of endothelial cell but also inhibit adhesion and activation of platelets. Thus, the approach described here may provide a basis for preparation of modified surface in cardiovascular implants application.     

Analytical potential energy functions for the ground and some excited states of N2

The analytical potential energy functions have been calculated for the ground state X¹Σ⁺_g and four excited electronic states a¹Π_g, A³Σ⁺_u, B′³Σ^?_u and B³Π_g of N₂ molecule using the algebraic and energy-consistent methods (AM-ECM). Based on our previously published full AM vibrational energies and spectroscopic constants, the low-lying force constants f_n, the expansion coefficients a_n and the variational parameters λ in the AM–ECM potentials are determined for these states. The computed AM–ECM potential energy curve of each state is in excellent agreement with the experimental data and better than other analytical potentials.     

Potential Energy Curves of Some Electronic Excited States of Metal Diatomic Molecules Using the Energy Consistent Method

An analytical five-term expansion potential is suggested to improve the recently proposed energy consistent method (ECM) potential based on a three-term expansion [Weiguo Sun, Mol. Phys. 92, 105 (1997) and Weiguo Sun and Hao Feng, J. Phys. B: At., Mol. Opt. Phys. 32, 5109 (1999)]. Applications of the new ECM to the electronic excited state 3(1)Pi of NaK, the excited state 2(3)Sigma(+)(g) of Na(2), and the excited states 3(1)Sigma(+)(u) and 3(1)Pi(u) of K(2) molecules show that the new ECM potential not only agrees excellently with the known Rydberg-Klein-Rees (RKR) data or accurate configuration interaction (CI) studies but also gives the potential data at the molecular asymptote and the dissociation region where experimental and quantum mechanical studies may have difficulties. The new ECM can correct the artifact which appeared in the three-term expansion potentials of both the previous ECM and the Huxley-Murrell-Sorbie (HMS) potential and can describe some states to which both the previous ECM and the HMS fail. Copyright 2000 Academic Press.     

用代数-能量自洽法研究双原子分子解析势能函数

基于计算双原子分子完全振动能谱及离解能的代数方法 (algebraic method,AM)和研究双原子分子解析势能函数的能量自洽法(energy consistent method,ECM),建立了计算双核分子体系精确解析势能函数的代数-能量自洽法(AM-ECM).应用AM-ECM方法研究了7Li+2-23Σg,KH-X1Σ+,NaLi-X1Σ+和NaLi-A1Σ+电子态的解析势能表达形式,并与其他方法的研究结果进行了比较,获得了能正确描述这些电子态在渐近区和离解区的精确解析表达结果.