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The third chapter employed a new method of taking pressure as step to simulate refrigerant flow characteristics in adiabatic capillary tubes , based on adiabatic capillary tube mathematic models . refrigerant critical flux in capillary tubes is predicted by means of back - propagated method . it indicates that this method can save computational time , so it can be used in engineering
在建立絕熱毛細(xì)管數(shù)學(xué)模型基礎(chǔ)上，采用以壓力為步長(zhǎng)的新方法對(duì)絕熱毛細(xì)管進(jìn)行了仿真計(jì)算，采用bp神經(jīng)網(wǎng)絡(luò)對(duì)制冷劑在毛細(xì)管中臨界流量進(jìn)行了預(yù)測(cè)，結(jié)果表明該方法能夠較大幅度地節(jié)省計(jì)算時(shí)間，因而具有工程應(yīng)用價(jià)值。
During the study of sol - gel process , we successfully synthesized the series of nanometer powder of the lizn ferrite by citric acid self - propagating method , studied the influence of the value of ph , the rate of citric and the calcinations temperature , discovered the optimum conditions to synthesize nanometer powder of the lizn ferrite
在溶膠-凝膠工藝技術(shù)研究中,利用檸檬酸自蔓延法制備了納米lizn鐵氧體粉末,研究ph值、檸檬酸組分、煅燒溫度等工藝條件對(duì)納米粉體性能與形貌的影響,探索出一條制備單一晶相的lizn鐵氧體納米粉末的工藝條件。