螯合树脂／聚砜复合滤膜的制备研究

本文以聚砜（PS）／螯合树脂（D418）作为膜材料,用相转化法制备了共混螯合平板滤器。考察了聚合物共混比例、凝固浴的组成、膜在空气中的蒸发时间,以及制膜液温度等工艺参数的变化对膜结构性能的影响。     

塑料光纤拉曼散射的研究

给出了聚甲基丙烯酸甲脂(PMMA)塑料光纤(POF)的一级受激拉曼散射光谱,研究了一级斯托克斯光谱特点,测试了它的阈值,带宽,分析了拉曼光谱的形成机制,并将塑料光纤的拉曼光谱和石英光纤的拉曼光谱进行了比较。     

平板宽波导光场分布及极化模

平板宽波导CO₂激光器波导内光场分布满足亥姆霍兹方程。在给定条件下,对光场分布方程进行求解,获得了极化模 EH_nm^x和EH_nm^y 的表达式。通过计算机计算,得出了在3×8 mm²波导放电区中所存在的EH_1.16极化模归一化理论分布曲线,其曲线与实验观测结果符合得很好。     

The applications of generalized variational principles in nonlinear structural analysis

This paper discusses the generalized variational principles founded by thetechnique of Lagrangian multipliers in structural mechanics and analyzes the nonlinearstatically indeterminate structures.It is assumed that the stress-strain relationship ofthe materials of structures has the form ofσ=Bε~(1/m)orτ=Cγ~(1/m),namely,thephysical equations of structures have the shape of exponential functions.Severalexamples are given to illustrate the statically indeterminate structures such as thetrusses,beams,frames and torsional bars.     

磺化丁基橡胶离聚体在溶液中的聚集行为(Ⅰ)──ESR谱研究

用ESR谱考察了磺化丁基橡胶锰盐(Mn-SIIR)离聚体在二甲苯/醇(少量)混合溶剂中的离子聚集行为。结果表明,在所考察的范围内,浓度及磺化度增大时ESR谱的形状变化不大,这反映了离子聚集程度并没有发生明显变化;另外,极性共溶剂(醇)增多时,谱线分辨度增大,反映了离子聚集程度下降;温度升高时谱线变模糊,反映离子聚集程度增大。这些结果有力地支持了Lundberg等人提出的离聚体溶液粘度变化平衡式。     

醇类液体的热压力系数及内压

本文测定25-85℃温度范围内正戊醇.正已醇.正庚醇和正辛醇的热压力系数,发现这些醇类液体的内压几乎不随温度而变,本文还将修正的vander waals 模型推广到了醇类液体,与非缔合液体一样,它们的排斥体积亦与密度呈线性关系.但是,模型参数之比B/A^2不再是个常数,而是随醇分子中碳原子数的增多而快速地减小, 这个比值可作为合能力的一种量度.     

悬臂矩形板的弯曲稳定和振动

本文用变分法讨论悬臂矩形板的弯曲、稳定和振动的问题,文中举了很多的算例.     

The bending,stability and vibrations of rectangular plates with free edges on elastic foundations

This paper discusses the problems of the bending, stability and vibrations of the rectangular plates with free boundaries on elastic foundations. In the present paper we select a flexural function, which satisfies not only all the boundary conditions of free edges but also the conditions at free corner points, and consequently we obtain a better approximate solution. The energy method is used in this paper.     

弹性地基上自由边矩形板的弯曲、稳定和振动

本文讨论了在弹性地基上自由边矩形板的弯曲、稳定和振动的问题.本文选择了一个挠曲函数,它不但能满足自由边的全部边界条件,而且也满足了自由角点的条件,从而得到了较好的近似解,文中使用了能量法.