Accurate prediction of the evolution of particle size distribution is critical to determining the dynamic flow structure of a disperse phase system.A population balance equation(PBE),a non-linear hyperbolic equation o...Accurate prediction of the evolution of particle size distribution is critical to determining the dynamic flow structure of a disperse phase system.A population balance equation(PBE),a non-linear hyperbolic equation of the number density function,is usually employed to describe the micro-behavior(aggregation,breakage,growth,etc.) of a disperse phase and its effect on particle size distribution.Numerical solution is the only choice in most cases.In this paper,three different numerical methods(direct discretization methods,Monte Carlo methods,and moment methods) for the solution of a PBE are evaluated with regard to their ease of implementation,computational load and numerical accuracy.Special attention is paid to the relatively new and superior moment methods including quadrature method of moments(QMOM),direct quadrature method of moments(DQMOM),modified quadrature method of moments(M-QMOM),adaptive direct quadrature method of moments(ADQMOM),fixed pivot quadrature method of moments(FPQMOM),moving particle ensemble method(MPEM) and local fixed pivot quadrature method of moments(LFPQMOM).The prospects of these methods are discussed in the final section,based on their individual merits and current state of development of the field.展开更多
从传播学角度看,Moment in Peking是一种传意写作。其特点在于作者明确的写作意图与强烈的受众意识。作者林语堂先生了解西方受众的期待域并预知作品所容涵的汉文化信息对于西方受众的理解所存在的障碍:读者对英语语言媒介中大量的汉语...从传播学角度看,Moment in Peking是一种传意写作。其特点在于作者明确的写作意图与强烈的受众意识。作者林语堂先生了解西方受众的期待域并预知作品所容涵的汉文化信息对于西方受众的理解所存在的障碍:读者对英语语言媒介中大量的汉语拼音词汇意义的认知障碍、英语读者对汉译词汇的文化伴随意义的认知障碍、英语读者对整体语境的感知障碍以及英语读者、英语语言媒介与汉文化思维的矛盾。对此,他采取以受众思维方式构筑文本叙事逻辑、以外显式语言信息构筑原语文化语境、以连接式立体文本克服读者对原语文化词汇认知障碍等有效的写作方法。这种传意写作方法对于我们今天民族文化的传播而言仍不失其典范与借鉴意义。展开更多
基金Supported by the National Basic Research Program of China (Grant No. 2004CB720208)the National Natural Science Foundation of China (Grant Nos. 40675011 & 10872159)the Key Laboratory of Mechanics on Disaster and Environment in Western China
文摘Accurate prediction of the evolution of particle size distribution is critical to determining the dynamic flow structure of a disperse phase system.A population balance equation(PBE),a non-linear hyperbolic equation of the number density function,is usually employed to describe the micro-behavior(aggregation,breakage,growth,etc.) of a disperse phase and its effect on particle size distribution.Numerical solution is the only choice in most cases.In this paper,three different numerical methods(direct discretization methods,Monte Carlo methods,and moment methods) for the solution of a PBE are evaluated with regard to their ease of implementation,computational load and numerical accuracy.Special attention is paid to the relatively new and superior moment methods including quadrature method of moments(QMOM),direct quadrature method of moments(DQMOM),modified quadrature method of moments(M-QMOM),adaptive direct quadrature method of moments(ADQMOM),fixed pivot quadrature method of moments(FPQMOM),moving particle ensemble method(MPEM) and local fixed pivot quadrature method of moments(LFPQMOM).The prospects of these methods are discussed in the final section,based on their individual merits and current state of development of the field.
文摘从传播学角度看,Moment in Peking是一种传意写作。其特点在于作者明确的写作意图与强烈的受众意识。作者林语堂先生了解西方受众的期待域并预知作品所容涵的汉文化信息对于西方受众的理解所存在的障碍:读者对英语语言媒介中大量的汉语拼音词汇意义的认知障碍、英语读者对汉译词汇的文化伴随意义的认知障碍、英语读者对整体语境的感知障碍以及英语读者、英语语言媒介与汉文化思维的矛盾。对此,他采取以受众思维方式构筑文本叙事逻辑、以外显式语言信息构筑原语文化语境、以连接式立体文本克服读者对原语文化词汇认知障碍等有效的写作方法。这种传意写作方法对于我们今天民族文化的传播而言仍不失其典范与借鉴意义。
