This paper presents nonlinear ordinary differential equations (ODES) of the heavier pellets movement for two phase flow, which actually represent a system of equations. The usual methods of solution such as Runge -Kut...This paper presents nonlinear ordinary differential equations (ODES) of the heavier pellets movement for two phase flow, which actually represent a system of equations. The usual methods of solution such as Runge -Kutta method and it's datum results are discussed. This paper solves ODES of general form using variable mesh-length, linearizing the nonlinear terms by finite analysis method, fuilding an iteration sequence, and amending the nonlinear terms by iteration . The conditions of convergent operation of iteration solution is checked. The movement orbit and velocity of the pellets are calculated. Analysis of research results and it's application examples are illustrated.展开更多
Chinese children are 6 centimeters （2.34 inches） miler and roughly 3 kilograms （6.6 pounds） heavier than 30 years ago as a result of the country＇s improved economic situation and better nutrition, according to a ...Chinese children are 6 centimeters （2.34 inches） miler and roughly 3 kilograms （6.6 pounds） heavier than 30 years ago as a result of the country＇s improved economic situation and better nutrition, according to a national research result published by the Ministry of Health on Dec. 30, 2006.展开更多
Perfluoroalkyl iodides reacted with conjugated dienes in aqueous acetonitrile solution in the presence of sodium dithionite at room temperature to give dimerization products, whereas, perfluo- roalkanesulfonyl bromide...Perfluoroalkyl iodides reacted with conjugated dienes in aqueous acetonitrile solution in the presence of sodium dithionite at room temperature to give dimerization products, whereas, perfluo- roalkanesulfonyl bromides reacted with conjugated dienes to form 1,4-adducts under actinic irradiation.展开更多
天然气气质对其管输相特性影响显著,相关研究可为解决管道析烃等问题提供依据。基于气-液相平衡理论,结合PR状态方程和Van der Waals混合规则,通过气-液闪蒸计算,分析了天然气中CH4～C7组分变化对其相特性的影响规律。研究表明:CH4～C3...天然气气质对其管输相特性影响显著,相关研究可为解决管道析烃等问题提供依据。基于气-液相平衡理论,结合PR状态方程和Van der Waals混合规则,通过气-液闪蒸计算,分析了天然气中CH4～C7组分变化对其相特性的影响规律。研究表明:CH4～C3组分对天然气相特性影响不大,C4以上组分的影响相对较大;随着管输天然气中高碳数组分含量的增加,其相特性曲线明显偏移;重组分含量的少量增加,即可显著提高管输天然气的临界凝析压力和温度,影响天然气的相特性,其中C7、C8组分的影响程度明显超过C6组分,C8组分的影响程度又明显超过C6、C7组分。工程设计中仅根据C6+总量分析天然气相特性不够准确,有必要对天然气重组分特征化和拆分方法进行研究。展开更多
文摘This paper presents nonlinear ordinary differential equations (ODES) of the heavier pellets movement for two phase flow, which actually represent a system of equations. The usual methods of solution such as Runge -Kutta method and it's datum results are discussed. This paper solves ODES of general form using variable mesh-length, linearizing the nonlinear terms by finite analysis method, fuilding an iteration sequence, and amending the nonlinear terms by iteration . The conditions of convergent operation of iteration solution is checked. The movement orbit and velocity of the pellets are calculated. Analysis of research results and it's application examples are illustrated.
文摘Chinese children are 6 centimeters （2.34 inches） miler and roughly 3 kilograms （6.6 pounds） heavier than 30 years ago as a result of the country＇s improved economic situation and better nutrition, according to a national research result published by the Ministry of Health on Dec. 30, 2006.
基金This research was supported by the National Natural Science Foundation of China as an item of major project.
文摘Perfluoroalkyl iodides reacted with conjugated dienes in aqueous acetonitrile solution in the presence of sodium dithionite at room temperature to give dimerization products, whereas, perfluo- roalkanesulfonyl bromides reacted with conjugated dienes to form 1,4-adducts under actinic irradiation.
文摘天然气气质对其管输相特性影响显著,相关研究可为解决管道析烃等问题提供依据。基于气-液相平衡理论,结合PR状态方程和Van der Waals混合规则,通过气-液闪蒸计算,分析了天然气中CH4～C7组分变化对其相特性的影响规律。研究表明:CH4～C3组分对天然气相特性影响不大,C4以上组分的影响相对较大;随着管输天然气中高碳数组分含量的增加,其相特性曲线明显偏移;重组分含量的少量增加,即可显著提高管输天然气的临界凝析压力和温度,影响天然气的相特性,其中C7、C8组分的影响程度明显超过C6组分,C8组分的影响程度又明显超过C6、C7组分。工程设计中仅根据C6+总量分析天然气相特性不够准确,有必要对天然气重组分特征化和拆分方法进行研究。
