Exact solutions of coupled nonlinear Klein-Gordon equation

In this paper, we employ the general integral method for traveling wave solutions of coupled nonlinear Klein-Gordon equations. Based on the idea of the exact Jacobi elliptic function, a simple and efficient method is proposed for obtaining exact solutions of nonlinear evolution equations. The solutions obtained include solitons, periodic solutions and Jacobi elliptic function solutions.     

Thermal Properties of Carboxymethylcellulose and Methyl Methacrylate Graft Copolymers

Carboxymethyl cellulose and methyl methacrylate graft copolymers (CMC-g-PMMA) were synthesized by using potassium persulphate (KPS) as initiator. These graft copolymers were characterized by Fourier transform infrared spectra (FTIR), thermogravimetric analyses (TGA), and differential scanning calorimeter analyses (DSC). In addition, the nonisothermal thermal decomposition kinetics of copolymers was studied. The experimental results indicated that in the temperature range from 300°C to 450°C, the copolymer had a mass loss. The activation energy was 41.96 kJ/mol, and the logarithm of the Arrhenius coefficient (lnA) was 17.31.     

外冷列管式耐硫煤气甲烷化反应器分析

使用Ｃｒａｎｋ－Ｎｉｃｏｌｓｏｎ隐格式差分法求解耐硫甲烷化固定床反应器的二维拟均相模型，通过模拟分析，考究管径、管数、反应气入口状态（压力、温度）、溶盐流量及入口温度对反应器操作的影响。对５万Ｎｍ＾３／ｄ煤气的反应器进行优化设计分析，为该工指导。     

Determination of environmental estrogens in human urine by high performance liquid chromatography after fluorescent derivatization with p-nitrobenzoyl chloride

A high performance liquid chromatographic method (HPLC) for the simultaneous determination of 4-nonylphenol, bisphenol A, 17α-ethinylestradiol and three endogenic estrogens including 17α-estradiol, 17β-estradiol, estriol in urine sample, based on precolumn derivatization with p-nitrobenzoyl chloride, is presented in this paper. The estrogens mentioned above in urine were firstly hydrolyzed with 0.6 mol/l HCl, and then enriched and cleaned-up by ENV-18 C18 solid phase extraction (SPE) column. The estrogens on column were eluted with dichloromethane, and the eluent was evaporated to dryness under gentle nitrogen flow. The residue was allowed to react with p-nitrobenzoyl chloride at 25 °C for 30 min. Separation was performed on a C18 column with gradient elution using acetonitrile and water as mobile phase. A fluorescence detection system was used to detect the fluorescent derivatization products. The detection limit of the method was 2.7 μg/l for bisphenol A and 17β-estradiol, 2.9 μg/l for 4-nonylphenol, 4.6 μg/l for 17α-estradiol and 17α-ethinylestradiol and 8.3 μg/l for estriol, respectively. The relative standard deviations (R.S.D.) ranged from 1.29 to 4.52% and the recoveries ranged from 85.5 to 99.9%. The method was applied to the determination of those six estrogens mentioned above in human urine samples collected from 20 healthy volunteers (aged 21-29). Bisphenol A (BPA) and 4-nonylphenol (NP) were detected with average contents of 1.22 ± 1.38 mg/l and 0.38 ± 0.77 mg/l in 10 male urine samples and 1.29 ± 1.22 mg/l and 0.05 ± 0.05 mg/l in 10 female urine samples, respectively. 17α-ethinylestradiol (α-EE2) was also detected with average contents of 0.13 ± 0.41 mg/l and 0.06 ± 0.15 mg/l in male and female urine samples, respectively.     

苏制дФC－8－3型摄谱仪功能的扩展与应用

本文叙述了前苏联制造的摄谱仪和单色仪的特点，对苏制摄谱仪进行了改装，使其既是摄谱仪，又具有单色仪的功能。经过多次实验，使用效果较好。     

Equi-Attraction and Continuous Dependence of Strong Attractors of Set-Valued Dynamical Systems on Parameters

Equi-attraction properties of the global attractors of a family of set-valued dynamical systems {G_λ, λ∈Λ} with respect to a parameter λ∈Λ, where Λ is a compact metric space, are investigated. In particular, under appropriate conditions, it is shown that the equi-attraction of the family is equivalent to the continuity of in λ with respect to the Hausdorff distance. An example involving differential inclusions is given. Mathematics Subject Classifications (2000) Primary 47H17, 58F03, 34C20. Desheng Li: Supported by NNSF of China (10251002) and NNSF of Gansu province (3ZS041-A25-006).     

亚象元动态成象系统空间分辨率研究

本文从采样间隔和调制传递函数两个方面分析了亚象元成象系统的理论空间分辨率.并将其与实际结果进行了比较.     

香精与乙烯/醋酸乙烯酯共聚物粒子界面行为的研究

研究了香精与乙烯 /醋酸乙烯共聚物粒子之间的界面行为 ,以便为香型母粒的制备提供必要的理论依据 .利用傅立叶变换红外光谱、表面张力、接触角及比表面面积等测定手段 ,分析了香精与载体之间的吸附类型和润湿作用 .并通过一系列吸附实验 ,讨论了配料比、温度、压力、搅拌等工艺条件对吸附量的影响 .结果表明 ,香精在乙烯 /醋酸乙烯共聚物粒子表面的吸附为物理吸附 ;香精无法完全润湿载体粒子表面 ,但可以对其形成部分浸润 ;提高温度、压力、搅拌速度可以增加吸附量 ,而延长吸附时间对增加吸附量贡献不大     

用于0.35 μm接触孔图形相移掩模研究

基于霍普金斯（Ｈｏｐｋｉｎｓ）理论,通过计算０．３５μｍ方孔的传统透射掩模、边缘相移掩模部分边缘相移掩模、辅助相移掩模以及衰减相移掩模的硅片表面空间像的光强分布,找出了适合于各种相移掩模的最佳参数。其中衰减相移掩模对提高光刻分辨率和增加焦深最为明显,尤其在相干因子（σ）较小时更是如此。