金属卟啉配合物在无机层状框架中的插入组装及光学性能

利用插入化学法,将金属卟啉配合物——四苯基卟啉合银(Ⅱ),组装到改性磷酸锆(十二烷基三甲基铵磷酸锆)无机层状物中.配合物与改性磷酸锆作用后,层状框架的层间距由3.00nm调整到1.96 nm,卟啉的Soret吸收带和发射光谱都出现明显的位移,其中最大吸收由421 nm红移到429 nm,最大发射由651 nm红移到65...     

New Jacobian Elliptic Function Solutions of Modified KdV Equation: Ⅲ

More recently, sixteen families of Jacobian elliptic function solutions of mKdV equation have been foundby using our extended Jacobian elliptic function expansion method. In this paper, we continue to improve our methodby using another eight pairs of the closed Jacobian elliptic functions. The mKdV equation is chosen to illustrate theimproved method such that another eight families of new Jacobian elliptic function solutions are obtained again. Thenew method can be more powerful to be applied to other nonlinear differential equations.     

New Exact Solutions to the Combined KdV and mKdV Equation

The modified mapping method is developed to obtain new exact solutions to the combined KdV and mKdV equation. The method is applicable to a large variety of nonlinear evolution equations, as long as odd- and even-order derivative terms do not coexist in the equation under consideration.     

Cosmological constant in the Bianchi type-I-modified Brans-Dicke cosmology

In 1961, Brans and Dicke [1] provided an interesting alternative to general relativity based on Mach’s principle. To understand the reasons leading to their field equations, we first consider homogeneous and isotropic cosmological models in the Brans-Dicke theory. Accordingly we start with the Robertson-Walker line element and the energy tensor of a perfect fluid. The scalar field φ is now a function of the cosmic time only. Then we consider spatially homogeneous and anisotropic Bianchi type-I-cosmological solutions of modified Brans-Dicke theory containing barotropic fluid. These have been obtained by imposing a condition on the cosmological parameter Λ(φ). Again we try to focus the meaning of this cosmological term and to relate it to the time coordinate which gives us a collapse singularity or the initial singularity. On the other hand, our solution is a generalization of the solution found by Singh and Singh [2]. As far as we are aware, such solution has not been given earlier.     

大气风场探测萨尼亚克干涉仪光程差的计算及探测模式研究

提出了基于时空混合调制的大气风场探测模式;应用光线追迹方法推导了一种改型萨尼亚克干涉仪在任意角入射时的光程差;从理论上对该干涉仪的参量作了分析计算;通过对同种、异种材料组合的理论分析,得出了异种材料组合的改型萨尼亚克干涉仪更加适合高层大气风场探测。该干涉仪具有稳态、大视场、大光程差、时空混合调制探测模式等显著特点。该研究发展了高层大气风场的被动探测理论,对风场探测技术研究、探测模式和工程化都具有十分重大的理论及实践意义。     

拉曼对光散射的实验研究

介绍了拉曼的生平和对物理学的主要贡献，回顾了他从观察海水的蓝色人手，继而发现气体、液体对光的散射规律，一直到发现物质的散射光不仅包含原来的波长，而且还包括与原入射光不同的其他波长的散射的研究过程，并讨论了他的成功对我们的启示．     

用改进嵌入原子法计算Cu晶体的表面能

用改进嵌入原子法(MEAM)计算了Cu晶体12个晶面的表面能.结果表明，密排面(111)的表面能最小.其他晶面的表面能随其晶面与(111)晶面夹角的增加而增加，据此可以粗略地估计各晶面表面能的相对大小.给出的几何结构因子的确定方法及结果可以直接用于计算其他面心立方晶体的表面能及其他特性.在Cu,Ag等面心立方薄膜中出现(111)择优取向或织构的机理是表面能的最小化. 关键词： 改进嵌入原子法 铜 表面能 计算     

高维非线性演化方程孤立波的同伦分析法求解

利用同伦分析法求解了修正的Kadomtsev-Petviashvili方程, 得到了它的近似孤立波解, 该解与精确解符合得非常好.结果表明，同伦分析法在求解高维非线性演化方程的孤立波解时, 仍然是一种行之有效的方法. 关键词： 同伦分析法 修正的Kadomtsev-Petviashvili方程 孤立波解     

Interaction between two folded solitary waves for a modified Broer--Kaup system

By means of a Painlevé-Baicklund transformation and a multi-linear separation-of-variable approach, abundant localized coherent excitations of a modified Broer-Kaup system are derived. There appear possible phase shifts for the interactions of the （2＋1）-dimensional novel localized structures, which are discussed in this paper.     

质子辐照不锈钢中氢气泡产生和演化研究

采用质子辐照模拟方法和正电子湮没寿命测量方法研究了质子辐照在国产改进型316L不锈钢中产生的氢气泡及其随辐照质子注量的演化过程。5×10^12,5×10^13,5×10^14／cm^2质子辐照的实验结果表明,辐照在不锈钢中产生氢气泡的尺度随辐照质子注量增加而增大,在质子注量为5×10^14／cm^2时氢气泡尺寸达到0．62nm,气泡的浓度随质子注量增加而减小。The bubble production and evolution in the home-made modified 316L stainless steel have been investigated by the proton irradiation simulation technique and the positron annihilation lifetime measurement. The experimental results of 5 × 10^12, 5 × 10^13 and 5 × 10^14/cm^2 proton irradiations show that the produced bubble size increases, while the bubble concentration decreases, with the increasing of the irradiation proton flueence. At the proton irradiation fluence of 5 × 10^14/cm^2 the bubble size reaches 0.62 nm.