在原油评价数据库中，为提高物性计算的精度，采用神经网络方法计算原油中馏分油物性。
In crude oil evaluation database, physical properties are calculated by using a neural network method.
石油及其馏分的物性数据是石油炼制工艺设计的基础数据，以往常常采用手工计算或查阅有关图表获得。
The property data of crude oil and its fraction is the basic data in design of petroleum refining technology. In the past these data were obtained by hand calculation or consulting tables and charts.
石油化工用换热器传热计算大量涉及烃类及其混合物物性数据的计算。
The thermal conduction calculation of heat exchanger used in petrochemical engineering is largely related to physical data of hydrocarbon and its mixture.
借助制冷剂物性数据图表，计算制冷剂物性，繁琐，费时，误差大。
With refrigerant physical properties data graph to compute physical properties is tedious, time-consuming, and error-large.
通过与国外文献计算结果比较可知，物性系数、化学反应速率常数、边界条件处理等对组分浓度影响较大，缺乏这些数据库将会影响计算结果。
By comparison with computation results of reference, it is cleared that material parameters, chemical reaction rate constants and boundary conditions affect the species concentration very much.
而当流量比较小而热流密度比较高时，物性的变化相当剧烈，计算结果与实验数据有很大差异。
For large mass flow rates was large and small heat fluxes, the variation of thermophysical properties was relatively unimportant so the experimental data agr...
文中还提出了根据YD系列导热油的有关物性数据用电子计算机进行关联、回归的关联式，可供目前设计计算时用。
The problems involved in the design are indicated. By correlating data on physical properties of the heat-transfer oils equations are obtained which CSN be used in design calculations.
文中还提出了根据YD系列导热油的有关物性数据用电子计算机进行关联、回归的关联式，可供目前设计计算时用。
The problems involved in the design are indicated. By correlating data on physical properties of the heat-transfer oils equations are obtained which CSN be used in design calculations.
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