弹性动力学中的瑞利－里兹法

瑞利－里兹法（Ｒａｙｌｅｉｇｈ－Ｒｉｔｚｍｅｔｈｏｄ）是变分问题的直接解法，它可以用来求弹性力学问题的近似解，也可以推广到弹性动力学中去。但在机械振动学和结构动力学的文献中，对于这一方法的数学概念和操作的技巧阐述得都不够详尽，本文就是为了补足这一缺憾而作，并通过寻求变截面梁的振动的近似解加以说明。     

大气污染物长期平均浓度计算程序及应用

本文给出了计算大气某种污染物的长期平均浓度的计算机程序,并说明了其用法。程序采用FORTRAN语言编写。     

Immunolocalization of aromatase, estrogen and estrogen receptor α and β in the epithelium of digestive tract and enteric neurons of amphioxus (Branchiostoma belcheri )

Immunohistochemical localization of aromatase, estrogen and estrogen receptor in the digestive tract and enteric neurons of amphioxus is investigated. It was found that immunoreactive proteins of aromatase, estrogen and ER-α and β are expressed in hepatic diverticulum, epithelial cells of anterior and posterior region of midgut, as well as in enteric neurons, while hindgut showed immunonegative. The results suggest that digestive tract of amphioxus may be able to synthesize estrogen and possess endocrine function, like rat gastric epithelium and enteric neurons in mammals. The present study provides authentic morphological evidence for explaining the action mechanism of estrogen in regulating the digestive function of gut and the functional evolution of estrogen, which has important theoretical significance in amphioxus.     

Weak response of the Atlantic thermohaline circulation to an increase of atmospheric carbon dioxide in IAP／LASG Climate System Model

Response of the Atlantic thermohaline circulation (THC) to global warming is examined by using the climate system model developed at IAP/LASG. The evidence indicates that the gradually warming climate associated with the increased atmospheric carbon dioxide leads to a warmer and fresher sea surface water at the high latitudes of the North Atlantic Ocean, which prevents the down-welling of the surface water. The succedent reduction of the pole-toequator meridional potential density gradient finally results in the decrease of the THC in intensity. When the atmospheric carbon dioxide is doubled, the maximum value of the Atlantic THC decreases approximately by 8%. The associated poleward oceanic heat transport also becomes weaker. This kind of THC weakening centralizes mainly in the northern part of the North Atlantic basin, indicating briefly a local scale adjustment rather than a loop oscillation with the whole Atlantic “conveyor belt” decelerating.     

钇在 MCrAlY 激光熔覆层中的存在形式及作用

研究了稀土元素钇（Ｙ）在激光熔覆层中的存在形式及对熔覆层抗氧化性能的影响．结果表明,Ｙ以富Ｙ粒子的形式弥散分布于基体相的晶界和晶内,净化了晶界,增强了氧化膜与基体间的粘附力,减小了氧化膜的长大速率,从而提高了熔覆层的抗氧化性能．     

广西英罗港红树林蜘蛛群落初步调查

报道广西英罗港红树林蜘蛛１２科２３属３１种,并对其群落结构及生境和资源意义进行简要分析。     

弹性连杆机构曲柄参数对电动机转速的影响分析

分析了弹性连杆机构曲柄参数与机构基频的关系,通过由基频引起的弹性振动对电动机转速的影响进而分析了曲柄参数对电动机转速的影响,并通过一个曲柄连杆机构实例进行了数值分析,这一结果对高性能机构设计有一定的指导意义。     

弹性曲柄摇杆机构的基频特性分析

揭示了弹性曲柄摇杆机构的基频（一阶固有频率）与机构位置之间的对应关系,并从理论上进行了探讨,通过一个曲柄摇杆机构实例进行了计算,验证了理论分析的正确性。     

取代硝基乙烯与二甲胺加成反应中间体结构的量子化学从头算研究

在从头算（３－２１Ｇ）等级上研究了不同性质取代基存在时,取代硝基乙烯同二甲胺加在中间体的结构,指出中间体的生成与取代基对反应物分子的Ｃ＝Ｃ的活化作用有关。     

水消声器阻力损失仿真研究

分析了水管路消声器阻力损失的产生机理，采用CFX5软件建立了五种水消声器模型，对它的稳态流场进行了模拟、仿真，得到了五种结构的水消声器在不同流量下的阻力损失，得到了与实验数据相近的计算结果，同时，误差基本控制在5％以下，说明用CFX5计算水消声器的阻力损失是可行的．