激光感生碰撞能量转移的四能级理论模型

首次考虑了两个中间态对激光感生碰撞能量转移的影响，发展了激光感生碰撞能量转移的四能级理论模型，推导出态振幅的运动方程，并给出碰撞截面的近似表达式，通过对Ｅｕ－Ｓｒ和Ｃｓ－Ｓｒ系统的数值计算表明，当频率差│ω２１│大小和│ω４３│可以相比时，利用三能级近似理论就难以获得令人满意的计算结果，而四能级理论模型则适合于任何情况下的激光感生碰能量转移。     

3-取代-5(3-乙基-4,5-二苯基噻唑叉)洛丹宁的增感性能

简单份菁(或称零甲川份菁)是一种可以用作卤化银感光乳剂层感蓝增感的染料。彩色正性材料的发展,要求感蓝乳剂层使用氯溴化银乳剂,并配合使用感蓝增感染料以符合感蓝区域的光谱要求。以氩离子激光为光源的电子分色片乳剂要求对波长488nm附近有较高的敏感,此种乳剂本身感色范围偏离氩离子激光发射峰。寻找增感效率高、光谱增感峰适合的感蓝染料很有必要。本文用2-甲硫基-3-乙基-4,5二苯基噻唑对甲苯磺酸盐(1)分别与3-取代洛丹宁(2)在无水乙醇存在下反应,制得六个未见文献报导的3-取代-5-(3-乙基-     

氯取代硫三碳菁染料的合成及性能

本文合成了七个硫三碳菁.其中四个具有桥环的菁染料。测定了它们的电子吸收光谱,讨论了结构对光稳定性的影响。并发现镍络合物能有效地抑制菁染料的光退色。     

三碳菁染料的研究

三碳菁染料的吸收在近红外区,可用作卤化银感光材料的红外增感染料,近年来在红外激光染料和光信息记录介质等方面也得到了开发及应用。在多甲川链上引入桥环可提高染料的稳定性。本文合成了9种含芳胺基取代的桥链三碳菁,讨论染料结构与其增感性能关系。     

A nonlinear dynamical model for atmospheric boundary layer turbulence

Using the qualitative theory of nonlinear dynamical systems and the ergodic theory of chaos and strange attractors, we study a truncated-spectrum model of dynamical equations of the atmosphere. In the parameter plane (Re, Ri), the atmospheric motion states can be divided into four regions: O (basic), P (periodic), T (turbulent or chaotic), and T-P (transition of T and P). We analyze the routes to turbulence during the day and at night. Finally, we discuss the physical aspects of the occurrence of turbulence.     

含吲哚核端基多甲川菁染料的合成及性能

我们曾合成了具有桥环的硫三碳菁及多甲川苯乙烯菁,并测定了光学性能。本文报道吲哚环为端基的桥链三碳菁和四甲川苯乙烯菁的合成及在有机溶剂中电子吸收光谱及溶解性能的测定。所用仪器同前,7种多甲川菁染料的合成反应如下:     

Direct grafting modification of pulp in ionic liquids and self-assembly behavior of the graft copolymers

In this paper, a novel biodegradable biomass-based amphiphile was prepared by direct grafting copolymerization of dissolved pulp with hydrophobic poly (l-lactide) in ionic liquids BmimCl. The molecular structures of the obtained copolymers were confirmed with ¹H-NMR, ¹³C-NMR and 2D HSQC NMR, and their physical properties were studied by TGA and XRD analysis. The self-assembly behaviors of these amphiphilies in aqueous solution was characterized by fluorescence spectrum and their critical micelle concentrations (CMC) were determined to be in the range of 0.326–0.062 mg/mL. TEM observations and DLS analysis revealed that the pulp-derived micelles had spherical and uniform morphology and small diameters (25–125 nm). It was also found that the surface tension of these copolymers solution firstly decreased dramatically with increasing concentration and then approached to a plateau value when the concentration was above their CMC value. MTT assay showed that the pulp-derived amphiphilic micelles exhibited good biocompatibility, which informed that these micelles could be expected to be used in biological regions, especially for the hydrophobic drug delivery system.     

FEEDBACK CONTROL OPTIMIZATION FOR SEISMICALLY EXCITED BUILDINGS

A feedback control optimization method of partially observable linear structures via stationary response is proposed and analyzed with linear building structures equipped with control devices and sensors. First, the partially observable control problem of the structure under horizontal ground acceleration excitation is converted into a completely observable control problem. Then the It6 stochastic differential equations of the system are derived based on the stochastic averaging method for quasi-integrable Hamiltonian systems and the stationary solution to the Fokker-Plank-Kolmogorov （FPK） equation associated with the It6 equations is obtained. The performance index in terms of the mean system energy and mean square control force is established and the optimal control force is obtained by minimizing the performance index. Finally, the numerical results for a three-story building structure model under E1 Centro, Hachinohe, Northridge and Kobe earthquake excitations are given to illustrate the application and the effectiveness of the proposed method.     

弱场中Ba-Sr系统激光感生碰撞过程的理论研究

针对四能级理论模型的第二种极限情况 ,提出了 Ba- Sr激光感生碰撞能量转移系统 ,该系统满足 |ω2 1| |ω4 3|。利用四能级理论模型对该 Ba- Sr系统进行了数值计算 ,并与三能级近似理论模型的计算结果进行了比较。通过比较四能级理论与三能级近似理论模型的计算结果 ,进一步证实了当 |ω2 1| |ω4 3|时 ,四能级理论模型可以过渡为三能级理论模型     

弱粘结的斜交铺设层合圆柱壳的柱形弯曲

导出了两端简文的具有弱粘结界面的任意斜交铺设层合圆柱壳柱形弯曲问题的一个精确弹性理论解。分析中采用线性弹簧模型来表征界面的弱粘结特性。引进新的物理量改写了基本方程,导出了对应的状态空间列式,并利用变量替换技术将该状态方程转换成常系数状态方程,从而方便求解。最后给出了数值算例,并讨论了弱界面的影响。