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25 June 1989, Volume 9 Issue 03 Previous Issue    Next Issue

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STUDY OF NEAR-FIELD PHASE CENTRE OF CORRUGATED HORN Xu Gohua Qi Yihong Wang Wutu 1989, 9 (03):  1-7.  Abstract ( 2205 )   Save In this paper,first the computational method on near-field phase characteristics of corrugated horn is given,then a definitionof phase centre of corrugated horn on unbalanced state is presented,andphase centre is obtained by employing optimization method,and finallythe changes of the near-field phase centre of corrugated horn is studied. Related Articles | Metrics

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MATHEMATICAL ANALYSES & EXPERIMENTAL VERIFICATION ON SPACECRAFT MATERIALS MASS LOSS PROCESS Wang Xianrun (Lanzhou Institute of Physics) 1989, 9 (03):  8-20.  Abstract ( 1743 )   Save Based upon a view that mass loss just is a diffusion releasingprocess,considering the effects of diffusion and degradation,the article hasestablished two mathematical expression groups concerning the history ofmaterials and mass loss process itself.By solving them,a general form ofthe function W(T,t)versus temperature and time,i.e.a bi-exponentialform,has been finally gotten.A corresponding fitting method has been devised and used to process andfit esperimental data.The results show that bi-exponential function has agood agreement with experiments.The mean square deviations are between10~(-3)-10~(-4). Related Articles | Metrics

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SPACE LIFE SCIENCE IN FUTURE Liu Kejia Wu Guoxing (Institute of Space Medico-Engineering) 1989, 9 (03):  21-26+46.  Abstract ( 4040 )   Save In this article the strategy for space life science in future wasanalyzed based on the informations of new publications of NASA and ESA, and the tentative ideas for space life science research were summarized.Theauthors pointed out that as a comprehensive discipline the scope of approachfor life science should cover the following four respects.They are space me-dicine incling space medicine,space physiology,space operational medicine,and the role of human being in space;space biology including gravity biolo-gy,controlled ecologic and life support system,biospheres and exterrestrialbiology;biomedical engineering in space station;processing and manufactureof biomaterials in space.In present article the main problems existing,thetrends of deveopment,and the missions of research of space life science werediscussed;and the great potentialities of economic benefits from the applica-tion of space ligh-technics were particularly emphasized. Related Articles | Metrics

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THE ANALYSIS AND SYNTHESIS OF INFORMATION TRANSMISSION SATELLITE SYSTEM Bao Miaoqin 1989, 9 (03):  27-36+53.  Abstract ( 1652 )   Save This paper gives a method to design the information transmi-ssion satellite system.Based on the analysis of the requirements and constra-ints of the satellite mission some factors are found for identifying the alte-rnatives.A two dimensional matrix model,which is constructed by designelements and units has been established for analysing the alternatives. Related Articles | Metrics

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PRESENT SITUATION AND PROSPECTS OF THE SPACECRAFT ELECTRICAL POWER SYSTEM Yan Huifen 1989, 9 (03):  37-40.  Abstract ( 1668 )   Save The purpose of this article is to provide information on past,current,and future satellite electrical power systems.They include solar array/chemical battery systems,radioisotopes and fission reactors. Related Articles | Metrics

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EVALUATION OF CONDUCTIVITY OF TWO SURFACE PAINTS FOR SPACECRAFT Lu Yusun Li Hua Han Xiaowen (Lanzhou Institute of Physics) Chen Wenying (Beijing Orient Scientific Instrument Factory) 1989, 9 (03):  41-46.  Abstract ( 1798 )   Save The preparation process of two paints—956 grey paint and 956green paint is briefly discussed in this artiele.The two paints conduction cha-racteristics and thier change regularities in the simulated space vacuum,ele-ctron irradiation and solar irradiation have been studied.Therefore,thecharging states of these paints surfaces on orbit can be predicted by theexperimental results.In addition,the possibility of using these paints onhigh orbit can also be expected. Related Articles | Metrics

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STUDY OF INDIUM-CADMIUM WETTING IN SPACE MICROGRAVITY Xie Xie Yan Rongxin 1989, 9 (03):  47-53.  Abstract ( 1908 )   Save Surface tension is important power for liquid in space microgra-vity.Indium and Cadmium was sealed in quartz glass tube,heated and thencooled slowly.We have studied Indium-Cadmium quartz glass wetting propertyand other surface phenomenon.Indium can wet quartz glass and Indium candislove Cadmium in the earth,but Indium can not wet quartz glass and In-dium-cadmium turn into two spheres in space microgravity.We measured theradii and sphericity of Indium sphere. Related Articles | Metrics

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RESEARCH ON MONOTECTIC ALLOYS IN MICROGRAVITY CONDITIONS IN SPACE Jiang Wanshun Da Daoan Zhang Yanwei (Lanzhou Institute of Physics) 1989, 9 (03):  54-58.  Abstract ( 1816 )   Save Specimens from the monotectic systems Zn-Pb,Al-Pb were te-sted by using Chinese recoverable satellite in microgravity.The physical lawsof remelting of the Al-Pb alloy below critical temperature have been resear-ched;the influences of Marangoni convection have been discovered thro-ugh the miscibility gap in microgravity and a homogeneous dispersion sampleof Zn-Pb powder alloy was obtained by using the liquid sintering in micr-ogravity.The researches in microgravity have proved the results as follows:although the microgravity condition can eliminate the macrosegregation andthe natural convection caused by gravity in monotectic alloys,the nongra-vity factors play an important role in the segregation of monotectic alloys. Related Articles | Metrics

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SEVERAL METHODS TO REALIZE INTERPROCESS SYNCHRONIZATION COMMUNICATION AND SHARING ON VAX/VMS SYSTEM Wang Yanguang (Beijing Institute of Satellite Information Engineering) 1989, 9 (03):  59-69.  Abstract ( 1896 )   Save In the application of real time data transfering,paralle dataprocessing,and etc.,strict demands are set on interprocess synchronization,communication and Sharing such as responsed time and data integrity.Co-mbining the methods used in my work,several methods to realize the tech-niques on VAX/VMS system are discussed in the paper. Related Articles | Metrics