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Table of Content

    10 March 1991, Volume 12 Issue 01
    论文
    SHANGHAI WHEAT SCAB PREDICTION EXPERT SYSTEM
    Ouyang Da (Agrometeorological Institute,CAAS) Tao Bingyan (Department of Applied Meteorology,Nanjing Institute of Meteorology)
    1991, 12(01):  40548-405. 
    Asbtract ( 6709 )  
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    Shanghai Wheat Scab Prediction Expert System(SWSPES)is built bas- ed on the expertise of agromoteorogists,Mathmatical models and actual mea- sured data in Shanghai area(1957—1985).The program is written in arti- ficial intelligence language GCLISP and algorithmic language BASICA.The strategy of inference is the foreword exact and inexact reasoning.The knowledge base is composed of production rules.Caculated modules contain Fuzzy preference ratio module and grey calamity forecasting module.SWSP- ES can provice service to predict the prevalent degree of wheat scab for long,medium and Short-range in Shanghai area.The forecast is classified into five classes.SWSPES can also be applied in other areas only with mo- difying and adding some rules in knowledge base.
    THE INFLUENCE OF METEOROLOGICAL FACTORS ON OXYGEN ENSITY AND ITS APPLICATION IN FRESH WATER BREEDING
    Wang Jianjun (Hangzhou Agricultural College)
    1991, 12(01):  40672-406. 
    Asbtract ( 6901 )  
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    The density of nitrogen and oxygen in atmosphere changes because of the existing moisture.In this paper,the decreasing of various air density Will be expressed as the following equation:a_i=e/p;the pressure decreasing eff- ect caused can be expressed as △P=-ap;and the temperature in creasing effect can be expressed as △T=T(a/1-a);using the atmospheric pressure P observed in the station,and water vapour pressure e can calculate the chan- ges of oxygen density,the results can be indirectly used for getting oxygen content changes in water.The values got in this way could be used as an index for taking measures to prevent fish from floating its head caused by the deficiency of oxygen supply and suffocation.