Fact, for the first three quarters of 2005, China textile machinery industry was in a downturn with a continuous decrease in imports. So figures for what’s been shipping into the country didn’t draw much applause, n...Fact, for the first three quarters of 2005, China textile machinery industry was in a downturn with a continuous decrease in imports. So figures for what’s been shipping into the country didn’t draw much applause, nor did the China textile machinery exhibition market, which has been a complete shambles.展开更多
近年来在一些新闻报道中时常会出现杯葛一词。如,“美欧各国为了反对苏联军队入侵阿富汗,于1980年杯葛了莫斯科奥运会。”“大陆方面对法向台湾战机一事进行了杯葛。”那么“杯葛”这个词的含义究竟足什么呢?原来“杯葛”同“坦克”“...近年来在一些新闻报道中时常会出现杯葛一词。如,“美欧各国为了反对苏联军队入侵阿富汗,于1980年杯葛了莫斯科奥运会。”“大陆方面对法向台湾战机一事进行了杯葛。”那么“杯葛”这个词的含义究竟足什么呢?原来“杯葛”同“坦克”“巧克力”等一样是一个音译外来词,来源于英语 boycott 一词。它在英语中作动词用时释意为(usu.of a group of people)to refuse to do business with(指一群人)抵制(贸易)或 to refuse to attend or take part in 拒绝出席或参加。其作名词时则表示 an act of BOYCOTTING(联合)抵制。(LongmanEnglish-Chinese dictionary of Contemporary English)。展开更多
Numerical techniques have increasingly been used to model fluid–particle two-phase flows. Coupling the immersed boundary method （IBM） and discrete element method （DEM） is one promising approach for modeling parti...Numerical techniques have increasingly been used to model fluid–particle two-phase flows. Coupling the immersed boundary method （IBM） and discrete element method （DEM） is one promising approach for modeling particulate flows. In this study, IBM was coupled with DEM to improve the reliability and accuracy of IBM for determining the positions of particles during the sedimentation process within viscous fluids. The required ratio of the particle diameter to the grid size （D/dx） was determined by comparing the simulation results with the analytical solution and experimental data. A dynamic mesh refinement model was utilised in the IBM model to refine the computational fluid dynamics grid near the particles. In addition, an optimum coupling interval between the IBM and DEM models was determined based on the experimental results of a single particle sedimentation within silicon oil at a Reynolds number of 1.5. The experimental results and the analytical solution were then utilised to validate the IBM–DEM model at Reynolds numbers of 4.1, 11.6, and 31.9. Finally, the validated model was utilised to investigate the sedimentation process for more than one particle by modeling the drafting-kissing-tumbling process and the Boycott phenomenon. Benchmark tests showed that the IBM–DEM technique preserves the advantages of DEM for tracking a group of particles, while the IBM provides a reliable and accurate approach for modeling the particle–fluid interaction.展开更多
The sky-high house prices are nothing new in China, especially in metropolitan areas like Beijing, Shanghai and Shenzhen, where houses in prime locations can fetch prices as high as those in London, New York and Tokyo...The sky-high house prices are nothing new in China, especially in metropolitan areas like Beijing, Shanghai and Shenzhen, where houses in prime locations can fetch prices as high as those in London, New York and Tokyo. People with an average monthly salary of between $400 and $500, the group most affected, face enormous pressure, both psychologically and financially, when required to repay bank loans on their new home. This has led to a new relationship where home-展开更多
文摘Fact, for the first three quarters of 2005, China textile machinery industry was in a downturn with a continuous decrease in imports. So figures for what’s been shipping into the country didn’t draw much applause, nor did the China textile machinery exhibition market, which has been a complete shambles.
文摘近年来在一些新闻报道中时常会出现杯葛一词。如,“美欧各国为了反对苏联军队入侵阿富汗,于1980年杯葛了莫斯科奥运会。”“大陆方面对法向台湾战机一事进行了杯葛。”那么“杯葛”这个词的含义究竟足什么呢?原来“杯葛”同“坦克”“巧克力”等一样是一个音译外来词,来源于英语 boycott 一词。它在英语中作动词用时释意为(usu.of a group of people)to refuse to do business with(指一群人)抵制(贸易)或 to refuse to attend or take part in 拒绝出席或参加。其作名词时则表示 an act of BOYCOTTING(联合)抵制。(LongmanEnglish-Chinese dictionary of Contemporary English)。
文摘Numerical techniques have increasingly been used to model fluid–particle two-phase flows. Coupling the immersed boundary method （IBM） and discrete element method （DEM） is one promising approach for modeling particulate flows. In this study, IBM was coupled with DEM to improve the reliability and accuracy of IBM for determining the positions of particles during the sedimentation process within viscous fluids. The required ratio of the particle diameter to the grid size （D/dx） was determined by comparing the simulation results with the analytical solution and experimental data. A dynamic mesh refinement model was utilised in the IBM model to refine the computational fluid dynamics grid near the particles. In addition, an optimum coupling interval between the IBM and DEM models was determined based on the experimental results of a single particle sedimentation within silicon oil at a Reynolds number of 1.5. The experimental results and the analytical solution were then utilised to validate the IBM–DEM model at Reynolds numbers of 4.1, 11.6, and 31.9. Finally, the validated model was utilised to investigate the sedimentation process for more than one particle by modeling the drafting-kissing-tumbling process and the Boycott phenomenon. Benchmark tests showed that the IBM–DEM technique preserves the advantages of DEM for tracking a group of particles, while the IBM provides a reliable and accurate approach for modeling the particle–fluid interaction.
文摘The sky-high house prices are nothing new in China, especially in metropolitan areas like Beijing, Shanghai and Shenzhen, where houses in prime locations can fetch prices as high as those in London, New York and Tokyo. People with an average monthly salary of between $400 and $500, the group most affected, face enormous pressure, both psychologically and financially, when required to repay bank loans on their new home. This has led to a new relationship where home-
