This paper presents a theoretical analysis for laminar boundary layer flow in a power law non-Newtonian fluids. The Adomian analytical decomposition technique is presented and an approximate analytical solution is obt...This paper presents a theoretical analysis for laminar boundary layer flow in a power law non-Newtonian fluids. The Adomian analytical decomposition technique is presented and an approximate analytical solution is obtained. The approximate analytical solution can be expressed in terms of a rapid convergent power series with easily computable terms. Reliability and efficiency of the approximate solution are verified by comparing with numerical solutions in the literature. Moreover, the approximate solution can be successfully applied to provide values for the skin friction coefficient of the laminar boundary layer flow in power law non-Newtonian fluids.展开更多
This work deals with a reliability assessment of springback problem during the sheet metal forming process. The effects of operative parameters and material properties, blank holder force and plastic prestrain, on spr...This work deals with a reliability assessment of springback problem during the sheet metal forming process. The effects of operative parameters and material properties, blank holder force and plastic prestrain, on springback are in- vestigated. A generic reliability approach was developed to control springback. Subsequently, the Monte Carlo simula- tion technique in conjunction with the Latin hypercube sam- pling method was adopted to study the probabilistic spring- back. Finite element method based on implicit/explicit al- gorithms was used to model the springback problem. The proposed constitutive law for sheet metal takes into account the adaptation of plastic parameters of the hardening law for each prestrain level considered. Rackwitz-Fiessler al- gorithm is used to find reliability properties from response surfaces of chosen springback geometrical parameters. The obtained results were analyzed using a multi-state limit reli- ability functions based on geometry compensations.展开更多
美国在以《自由信息法案》为核心的信息披露制度体系中,通过衔接《公共卫生安全和生物恐怖主义预防和应对法案》,将生物安全信息披露豁免纳入政府信息披露豁免规则之中。本文基于Civil Beat Law Center诉CDC信息披露豁免案来分析美国生...美国在以《自由信息法案》为核心的信息披露制度体系中,通过衔接《公共卫生安全和生物恐怖主义预防和应对法案》,将生物安全信息披露豁免纳入政府信息披露豁免规则之中。本文基于Civil Beat Law Center诉CDC信息披露豁免案来分析美国生物安全信息披露豁免所涉法律适用、解释原则、运行方式等,试洞见其相关披露制度运行的特点和所存在的问题,以期能有助于国内相关的研究。展开更多
基金the Science Foundation of North China Electric Power University(No.93210706)
文摘This paper presents a theoretical analysis for laminar boundary layer flow in a power law non-Newtonian fluids. The Adomian analytical decomposition technique is presented and an approximate analytical solution is obtained. The approximate analytical solution can be expressed in terms of a rapid convergent power series with easily computable terms. Reliability and efficiency of the approximate solution are verified by comparing with numerical solutions in the literature. Moreover, the approximate solution can be successfully applied to provide values for the skin friction coefficient of the laminar boundary layer flow in power law non-Newtonian fluids.
文摘This work deals with a reliability assessment of springback problem during the sheet metal forming process. The effects of operative parameters and material properties, blank holder force and plastic prestrain, on springback are in- vestigated. A generic reliability approach was developed to control springback. Subsequently, the Monte Carlo simula- tion technique in conjunction with the Latin hypercube sam- pling method was adopted to study the probabilistic spring- back. Finite element method based on implicit/explicit al- gorithms was used to model the springback problem. The proposed constitutive law for sheet metal takes into account the adaptation of plastic parameters of the hardening law for each prestrain level considered. Rackwitz-Fiessler al- gorithm is used to find reliability properties from response surfaces of chosen springback geometrical parameters. The obtained results were analyzed using a multi-state limit reli- ability functions based on geometry compensations.
文摘美国在以《自由信息法案》为核心的信息披露制度体系中,通过衔接《公共卫生安全和生物恐怖主义预防和应对法案》,将生物安全信息披露豁免纳入政府信息披露豁免规则之中。本文基于Civil Beat Law Center诉CDC信息披露豁免案来分析美国生物安全信息披露豁免所涉法律适用、解释原则、运行方式等,试洞见其相关披露制度运行的特点和所存在的问题,以期能有助于国内相关的研究。
