RECREATING SMALL SEAMLESS TUBE MILLS BY PIERCING INSFEAD OF ROLLING     

Zhang Caian Mo Lilong Lu Zhiwen 《保鲜与加工》1992,(6):128-131

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.  相似文献   

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     

岳占碰  李世杰  张学明  韩春田  郭斌  王洪斌  杨增明 《中国农学通报》2006,22(2):14-14

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。  相似文献   

Study on Computer 3D-Reconstruction Algorithm of the Contour Points Matching Interpolation for Serial Cross Images     

Zhang Shuangten  Zhang Taiyi 《保鲜与加工》1994,(2):1-5

A computer 3D-reconstruction algorithm was proposed for serial cross images,which is called contour points matching interpolation algorithm. The intermediate contours betweentwo neighbouring contours are preduced by contour points matching interpolation to form 3D-shapeof the reconstructed object. This algorithm is simple and can be easily implemented. Its advantagesare fast speed and strong adaptability for medical serial cross images 3D-reconstruction. Experi-ments show that the results are satisfactory.  相似文献   

Minimal Periodic Solutions of SuperquadraticFirst Order Convex Hamiltonian Systems     

Zhang Shiqing 《保鲜与加工》1996,(6):96-103

This paper generalizes all known results on Rabinowitz's minimal periodic solution conjecture under the assumption that Hamiltonian function is C2 strictly convex.  相似文献   

STATE VARIABLE METHOD FOR DYNAMIC SIMULATION OF HVDC SYSTEMS     

Zhang Wei Ren Zhen Qin Yihong Liao Qing 《保鲜与加工》1990,(1):56-62

A flexible mathematical model used for dynamic simulation studies of HVDC systems which is based on the stale variable method is presented, and the correspongding computer program has been implemented. Generality, easy to use, and suitable to run on microcomputers are the main features of the model and the computer program. Therefore the model is easy to be extended for application. An example is given in the paper to verily the coneclness of the model and the program.  相似文献   

THREE CRITICAL POINTS THEOREM AND ITS APPLICATIONS     

Zhang Shiqing 《保鲜与加工》1989,(1):105-107

In this paper, by use of the pseudo-gradient vector field, the three critical points theorem in [2] is extended to the C1 function in the Ba-nach space, and therefore the three critical, points theorem in [5] is strengthened and the existence of the saddle point of the C2 function is discussed.  相似文献   

Study on The origin of The Cracks And Their Elinination In Expanded Pearlite And Waste Glass Compound Decorative puank     

Zhang Zhiqiang  Lu Jian  Wu Fang  Zou Yicong 《保鲜与加工》1995,(3):60-64

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THE MATHEMATICAL MODEL OF CARBURIZED MASS-TRANSFER AND ITS MEANINGS     

Zhang Dingfei Wh Enling 《保鲜与加工》1989,(5):51-58

This paper deals with the kinetics of carbon atoms transfer from gas phase to solid phase in gas carburizing. According to the kinetic equations of the chemical reactions on the solid surface, it is deduced that the carbon transfer quantity from gas phase to solid phase is in direct proportion to the difference of carbon activiries between gas phase and solid phase. Based on what is mentioned above, we set up the kinetic equation of carbon transfer from gas phase to solid phase, discussed the factors which affected the carbon transfer. It was known then that increasing the contents of carbon monoxide and hydrogen in gas phase could qu'icken the carbon transfer. On the other hand, proper oxidants, especially proper water, could quicken the carbon transfer.  相似文献   

PROBLEMS OF THE BEST APPROXIMATION IN WIENER-SOBOLEV SPACE     

Zhang Jianhua 《保鲜与加工》1992,(4)

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A CALCULATION OF THE ECCENTRICALLY LOADED BRICKWORK WITH BIAXIAL BENDING IN TERMS OF ULTIMATE STRENGTH DESIGN METHOD     

Zhang Deshan 《保鲜与加工》1988,(2)

This paper suggests a calculation formula for eccentrically loaded brickwork or column with biaxial bending in terms of ultimate strength design method. The coefficients of the formula, are compiled as design charts so that the formula can be directly used for design of this kind of structural members.  相似文献