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A preliminary study on simplified simulation model of spring wheat growth
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作者 Wang Futang, Wang Shili, Li Youwen and Guo YousanAcademy of Meteorological Science,SMA,Beijing 100081,ChinaMeteorological Institute of Inner Mongolia Autonomous Region,China 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 1990年第4期61-71,共11页
In the model developed in this paper, taking the characters and requirements of meteorological services into account, some conventional meteorological observations which are easy to be obtained have been ch.osen, and ... In the model developed in this paper, taking the characters and requirements of meteorological services into account, some conventional meteorological observations which are easy to be obtained have been ch.osen, and mathematical equations describing micro-growth processes of crops have been established on the basis of the field experiments, laboratorial analysis and computer's modelling tests with time interval of ten-days for several years (1987-1989), in accordance with the known biological and physical rules and corresponding reference literatures. It is a preliminary simplified simulation model of spring wheat growth in optimal water and nutrient conditions. The field experiments show that simulation results of this simplified model are satisfactory. The potential operational application and theoretical sense are significant in the meteorological forecast of yield and in the assessment of influences of climatic change on agriculture. 展开更多
关键词 growth simulation simplified dynamic model spring wheat.
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Effects on dynamic characters of antenna structures in satellite induced by disordered parameters
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作者 刘相秋 《High Technology Letters》 EI CAS 2009年第2期135-140,共6页
A simplified dynamic model of a dish antenna in satellite is established in this article.The modelcan be easily used to analyze the dynamic behaviour of the antenna structure.In terms of the simplifiedmodel,effects on... A simplified dynamic model of a dish antenna in satellite is established in this article.The modelcan be easily used to analyze the dynamic behaviour of the antenna structure.In terms of the simplifiedmodel,effects on dynamic characters due to the disorder of parameters are investigated in details.Thefrequencies calculated by the simplified model accord with those computed by ANSYS.Based on the modeshapes of disordered and perfect structure,the influence law and varying trend of dynamic characters ofantenna structures in satellites produced by stiffness and mass of antenna ribs,stiffness of antenna mem-branes and angles between adjacent ribs,are obtained.The analyses in the paper indicate that the effectsby disordered parameters can not be ignored in the dynamic analysis of such structures. 展开更多
关键词 antenna structures in satellite simplified dynamic model disordered parameters dynamic characters vibration mode localization
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