动态扩充的零件库系统的研究与开发

在对零件库设计方法进行了深入研究和分析的基础上 ,提出了基于 C/ S模式的零件库系统构架 ,设计了链表式数据库 ,并提出了基于链表式数据库的动态匹配算法 ,实现了零件库 (含组合件 )系统的动态扩充和零件及组合件尺寸参数的离线编辑功能 ,从而大大地提高了零件库、组合件库的建库效率 ,所开发的零件库系统已应用于“基于知识的机床夹具 CAD系统”,取得了良好的效果     

Distribution of sex steroid hormone receptors in the avian brain: functional implications for neural sex differences and sexual behaviors

Developmental and seasonal changes in the production of androgens, estrogens, and progestins seem to control sex-specific differentiation and seasonal changes in appetitive and consummatory sexual behaviors of birds. This results in profound sex differences in the quality (sex-specific) or quantity (sex-typical) of behaviors such as courtship, territoriality, or copulation. Steroids affect the brain by binding to intracellularly located receptors. The same brain areas express androgen, estrogen, and progesterone receptors in male and female brains. Sex differences in these genetically determined patterns occur in the size of neuron populations that intrinsically express sex steroid receptors. Further permanent sex differences are subsequent to degenerative fates of receptor expressing neuron populations during ontogeny. Transient sex differences in receptor expression appear to be due to area-specific up- and down-regulation of receptor levels, reflecting transient changes in the level of circulating steroids, changes in environmental conditions, or in the physiological status of the individuals. In particular, intrinsic sex differences in the expression pattern of sex steroid receptors and steroid-independent regulation of the expression level of these receptors in the brain are limiting mechanisms for gonad-dependent sexual development and activities.     

动态模拟试验技术在汽车结构动强度分析中的应用

远程参数控制技术日益成为汽车台架模拟试验不可缺少的技术手段。以轿车车身为研究对象，利用远程参数控制技术实现了在实验室内对实际道路行驶状况的复现，并且对两种载荷作用下的试验数据数据进行分析对比，由此对汽车结构动强度模拟试验技术进行了研究和探索。     

BKX-I型并联机床的实验模态分析

应用锤击法和基于变时基采样的SIMO法 ,对BKX -I型并联机床进行了模态实验 ,分别获得了机床沿x、y、z方向和机床整体结构的低阶固有频率、振型、阻尼比以及相应的振型动画。在此基础上 ,对该并联机床动态特性的特点进行了分析 ,明确了该机床动态特性的几个特点 ,确定了该机床的薄弱环节 ,并提出了提高并联机床动态特性的具体措施 ,为并联机床结构的动态设计和优化设计提供了依据     

Ultra-high voltage electron microscopy: Past,present, and future

High voltage electron microscopy has shown numerous advantages for the study of natural science, including biology, but it is especially useful in materials science. The most important advantage for materials science is in-situ experiments on detailed processes of the same phenomena that occur in bulk materials. For such in-situ experiments, the specimens should be thicker than a few microns to observe the behavior of lattice effect. The maximum observable thickness of the specimens and other advantages markedly increase with increasing accelerating voltage, and since 1965, two 3 MV instruments have been installed. The present paper is mainly concerned with these 3 MV electron microscopes and their applications to new research fields.     

多绳提升机钢丝绳动态张力传感器的研制

针对多绳摩擦提升机的特点，研制了一种新型的差动电容式钢丝绳张力传感器，采用弹性敏感元件与转换电路集成为一体的整体结构。试验结果表明：传感器性能稳定、灵敏度高、抗干扰能力强，可满足对钢丝绳动态张力测量的要求。     

利用位移测量推估梁及桥梁动态应变的方法研究

桥梁损伤检测是桥梁工程的一个重要课题。梁的应力应变参数与其刚度存在直接关系，因而应变模态测量可望用于桥梁损伤检测。动态应变测量可通过位移测量实现，但对位移传感器提出了特定的要求。对位移测量方法的误差分析表明传感器的相频一致性对测试精度有较大影响。在此分析基础上，利用特制的DP传感器进行了工字钢梁的模拟实验，实验结果验证了测量方法的可行性。     

快速探测的坐标测量机动态误差计算分析

快速探测是提高坐标测量机工作效率的有效手段，同时还必须要保证原有的测量精度。采用有限元分析方法（FEM）对快速探测过程中由惯性力和驱动力产生的动态误差进行了预测，分析结果是合理的，为后继的动态误差补偿工作打下了良好的基础。     

带附加气室空气弹簧性能试验系统的搭建与试验研究

针对主、附气室通过管路连接的空气弹簧工作过程复杂性及其特殊的非线性,搭建带附加气室空气弹簧特性试验系统,进行不同附加气室容积和不同连接管路直径的空气弹簧特性试验研究;设计出基于LabView的测试软件,通过数据采集系统测得弹簧作用力、弹簧位移和弹簧内部气体压力;针对四种容积的附加气室、四种内径的连接管路和四种初始气压在0.5～10.0 Hz激振频率范围内对空气弹簧特性进行台架试验,试验分析各影响因素对弹簧特性的影响规律,并探讨各因素的影响机理。试验结果表明,试验的可变因素对空气弹簧特性具有不同程度的影响:附加气室容积和连接管路管径的增大会降低空气弹簧的动刚度,但附加气室容积对动刚度的影响程度还受主附气室容积比的影响;弹簧内初始气压和激振频率的增加会增大弹簧动刚度,台架试验可以为带附加气室空气弹簧的设计及应用提供依据。