Operational Deflection Shape Analysis of Large Scale Electromechanical System

Operational Deflection Shapes of large scale electromechanical system can be ex-tracted directly from multipoints response of the operating system by using of the modal shape analy-sis method. Thev can be used for engineers evaluating the practical dynamic beavior of the largescale elecltromechanical system,checking the existence of local reso,iance of the Stibsystem. and in-dentifying the wcakened positions of the rigidity of structure, In this paper the method of measuringand extracting the operational deflection shal1e of the electromecha nical system is given and theavailability of operational deflection shape is proved by analyzing the actual vibration of a large ex-haust fan system as an example.     

东方百合生殖器官诱导鳞茎的繁殖技术研究

以东方百合的花托、花丝、花柱和子房为材料，直接诱导鳞茎和低温锻炼繁殖技术研究。结果表明，4种生殖器官均可直接诱导出鳞茎，分化能力依次为花托〉花丝〉花柱〉子房；鳞茎的中层鳞片分化能力最强；鳞茎分化和生根的最佳培养基是MS＋KT0．05mg／L＋NAA0．2mg／L＋白糖5％＋琼脂0．5％；试管鳞茎移栽的适宜方法是生根的试管鳞茎在2-5℃下，保持60d后栽培到泥炭土：珍珠岩=8：2的基质中，锻炼培养20d。     

NONLINEAR COUPLING IN THERMOELAST1C THEORY AND A SOLUTION TO THE PROBLEM IN THE HALF SPACE

It's recommended that the term coupled in temperature and strain is nonlinear and is significant in thermoelastic theory. Using the solution of linear coupled and uncoupled theory and selecting appropriate general coordinates, authers approach the nonlinear coupled problems with a variational method. A solution to the problem in half space, is given. It is shown that the difference between the nonlinear coupled theory and the linear coupled or uncoupled theory would be notable when the amplitute of temperature is much larger than that of the reference slate.     

Analysis of thermal stress in a water pipe of blast furnace copper stave

To solve the general problem that copper staves experience water pipe failure in blast furnace,the effects of constraints on the thermal stress distribution of copper stave water pipe are investigated by thermal-structural coupling analysis.In this study,a mathematical model of thermal stress of copper stave is established to analyze the thermal deformation and stress distribution of water pipe under subject to different types of constraints.The results show that the thermal stress on the root of water pipe is larger than others as the terminal of water pipe is free or being fixed.But the equivalent stress on the root of water pipe is just 45 MPa as the terminal of water pipe is free,which is lower than the yield strength of pure copper.The equivalent stress on the root of water pipe is about 272 MPa as the terminal of water pipe is being fixed,and exceeds the yield strength of pure copper.The water pipes should be flexible.The maximum equivalent stress is about 600 MPa as the water pipe is subjected to the constraint of shell,which is far beyond the yield strength of pure copper.The maximum displacement is located at the end of water pipe and is about 1.73 mm.Then the diameter of the hole should be 120 mm with taking installation error into consideration.     

TEM INVESTIGATION ON AGED ION-NITRIDING LAYER OF PURE IRON

The phase transformation in the diffusion layer after slow cooling and aging of pure iron ion -nitrided was investigated with TEM. Refering to principle of Moire method measuring macroscopical strain, the values of coherent strain at interfaces between a" and aN phases were determined by means of TEM analyses.     

玉米品种结实性差的原因及预防措施

2005年沧州市夏播玉米果穗出现了不同程度的缺粒、缺行现象,有的果穗结实仅有一半,一般减产30%～70%,个别地块颗粒无收.针对上述问题,我们组织技术人员深入田间进行了认真的调查分析,基本明确了造成玉米结实性差的主要原因及预防措施.     

VARIABLE DAMP STRUCTURAL RELIABILITY DUE TO MULTIPLE RANDOM EXCITATIONS AND SENSETIVITY ANALYSIS

The reliability of random vibration is discussed,and then by using the first order perturbation method and with the aid of relation of the systemic response function to the first order sensetivity of variable damp parameter, the rate of change of structural reliability indication is derived, therefore the constraint equation to guarantee reliability for the structural optimization design is proved and the satisfactory result is obtained,test and the practicability of this method is tested.     

RECREATING SMALL SEAMLESS TUBE MILLS BY PIERCING INSFEAD OF ROLLING

This paper discuss the effects of automatic plug mills in small seamless tube mills. Far from traditional ideas,the auther comes rp with mew ideas, which adot the mew process of replacing rolling by piercing,a huge sum of economical interests and great social benefits will be gained.     

白血病抑制因子（LIF）及其受体在月经 周期猕猴卵巢内的表达

应用免疫细胞化学方法对白血病抑制因子（leukemia inhibitory factor, LIF）、白血病抑制因子受体（leukemia inhibitory factor receptor, LIFR）和gp130在月经周期猕猴卵巢内的表达进行了研究。结果表明：LIF、LIFR和gp130在猕猴卵巢内的表达量随月经周期的不同而变化，LIF及其受体在增殖期卵巢内的表达量高于分泌期的卵巢。LIF及其受体在原始卵泡、腔前卵泡和有腔卵泡的卵细胞内表达量均较高，在颗粒细胞、卵泡膜、卵巢生殖上皮和卵巢基质中有少量表达，而在闭锁卵泡、退化的黄体和卵巢髓质中未见表达。LIF及其受体在猕猴卵巢内的表达可能受卵巢分泌的类固醇激素所调控，LIF可能通过自分泌或旁分泌的方式在猕猴卵泡发育及排卵等过程中起重要作用。