Experimental Research on Resonance Response Differences of the Rotor System with Sliding and Rolling Bearings

Most of the research work on bearing-rotor systems usually simplifies the supporting bearing as a spring or damp system, and ignores that the resonance responses involve obvious differences when the same rotor system is supported by varying types of bearings. Aiming at the resonance responses of coast down running tests of the rotor system, we employed two different bearings in experiments: One is the fluid film journal bearing, and the other is the rolling element bearing. The experimental results obtained with the above bearings are compared. The resonance test Bode plots and orbit shapes of the rotor shaft are established. Also, summarized under resonance are the dynamic characteristics and regularities of the two types of bearing-rotor systems. The natural frequency and resonance mode of the same rotor system will change thoroughly with the type of supporting bearings. The results are helpful for system modeling, security running, dynamic design, the study of dynamic characteristics, and the fault diagnose of bearing-rotor systems.     

Phorbol esters enhance glutathione-induced feeding response in Hydra

Summary Pharmacological observations on the glutathione-induced feeding response in Hydra demonstrate that phorbol esters, calcium ionophore A 23187 and lithium ions significantly enhance and protract glutathione action, whereas polymixin B induces a dramatic shortening of the feeding response. An involvement of membrane phosphatidylinositol breakdown in the control of the feeding response is suggested.     

多晶体热弹性弛豫中的红外发散响应

本文应用红外发散模型计论多晶体内的热弹性弛豫过程。在用热力学理论和热传导定律处理固体热弹性弛豫的基础上,考虑了由界面内无序的多休相互作用导致的红外发散响应,修正了熵产生的速率方程,导得热弹性内耗峰公式。此公式得到实验的证实,由此解释多晶体内热流引起的内耗峰的增宽和不对称性。     

建立快速反应的供应链

围绕如何使企业在新世纪取得新的经济增长点的问题展开了探索.从供应链的战略角度来看待企业盈利和发展,成为现代企业家的基本原则.因此建立快速反应的供应链就成为企业获取核心竞争力的必由之路.     

男体下装着衣状态的运动强度分析

从衣环境人体工学角度出发,通过对人体穿着不同厚度、密度、宽松量、湿度的裤装进行安静,运动状态的对比实验,分析了耗氧量、皮肤温、脉拍、能量代谢率等各项生理指标的变化规律,得到了影响人体运动强度的相关因子和相关关系。     

分布参数突触联接动态神经网络及其稳定性研究

本文利用树突树的冲激响应对分布参数突触联接进行了形式化描述。在树突空间结构形式化描述基础上，我们提出一种分布参数突触联接动态神经网络，并且详细地研究它的有界性和稳定性。本文主要贡献是，得到了包括突触联接在内的树突树系统的冲激响应及其绝对可积性；提出了分布参数突触联接动态神经网络及其数学描述；给出了有界性和稳定性定理。     

Numerical Simulation for Arc Windshields of Aircrafts Subjected to Bird Impact

A finite element model including full-scale circular arc windshield glass and the relative parts of the military plane is established in this paper. The model is analyzed by using an explicit element code LS-DYNA3D for analyzing the nonlinear dynamic response of structures. The data in aspects of displacement, strain, stress and contact force in the process of deformation are obtained. The deformation and failure mechanism of circular arc windshield glass are discussed. The possible location at which failure may take place is given. The valuable data are provided for designing,researching and producing new windshields with high crashworthiness.     

Pb－Pb＿3（PO4）＿2化学修饰电极响应机理的探讨

初步探讨了Ｐｂ－Ｐｂ３（ＰＯ４）２化学修饰电极的响应机理，提出了该修饰电极在溶液中的界面模型，说明了该修饰电极电位的产生     

Effect of in vivo pre-treatment with oestradiol and either GnRH,GnRH agonistic analog or GnRH antagonistic analog on GnRH-stimulated secretion of LH in vitro

Summary In vivo treatment with GnRH or with GnRH agonistic analog (AG), but not with GnRH antagonistic analog (ANT), depleted the LH stores of the rat pituitary gland. This depletion was potentiated by oestradiol. Oestradiol augmented the in vitro LH response of the pituitary gland to GnRH. This augmenting effect of oestradiol became smaller with increasing rates of in vivo administration of GnRH or AG, but not with ANT. With respect to both depletion of the LH stores and suppression of the augmenting effect of oestradiol, AG ist about 20 times as potent as GnRH.     

一类三种群捕食链模型的定性分析

本文提出一类三种群捕食链的数学模型，其中被食者对第一捕食者具有广义Ｈｏｌｌｉｎ型功能反应，讨论了捕食链系统的稳定性及其有界性问题。