China National Textile & Apparel Council released the latest industry reviews in its mid-year conference that in the first half of 2010,the textile industry kept its stable recovery and the whole situation was goo...China National Textile & Apparel Council released the latest industry reviews in its mid-year conference that in the first half of 2010,the textile industry kept its stable recovery and the whole situation was good;for the anticipation of late half,this industry would continue this tendency but growth speed might slow down.展开更多
This study introduces space, transportation, and money into an economic growth model. Growth theory neglects the importance of transportation on economic growth and transportation economics fails to properly explain h...This study introduces space, transportation, and money into an economic growth model. Growth theory neglects the importance of transportation on economic growth and transportation economics fails to properly explain how changes in transportation conditions (such as technological improvement, infrastructure investment, and oil prices) affect long-term economic growth. By proposing a growth model with transportations, we try to explain effects of transportation on economic growth. Our model describes dynamic interactions among capital accumulation, travel time, housing, residential distribution, amenity, and endogenous time distribution among work, travel, and leisure. The study examines effects of inflation policy, transportation conditions, and other conditions on long-term economic growth and economic geography. The paper demonstrates a way to integrating some important models in the literature in economic growth theory, urban economics, and transportation research so that the significance of transportation systems upon economies can be properly analyzed.展开更多
In this study, the microstructure evolution of rapidly solidified ASP30 high-speed steel particles was predicted using a simulation method based on the cellular automaton-finite element （CAFE） model. The dendritic g...In this study, the microstructure evolution of rapidly solidified ASP30 high-speed steel particles was predicted using a simulation method based on the cellular automaton-finite element （CAFE） model. The dendritic growth kinetics, in view of the characteristics of ASP30 steel, were calculated and combined with macro heat transfer calculations by user-defined functions （UDFs） to simulate the microstructure of gas-atomized particles. The relationship among particle diameter, undercooling, and the convection heat transfer coefficient was also inves- tigated to provide cooling conditions for simulations. The simulated results indicated that a columnar grain microstructure was observed in small particles, whereas an equiaxed microstructure was observed in large particles. In addition, the morphologies and microstructures of gas-atomized ASP30 steel particles were also investigated experimentally using scanning electron microscopy （SEM）. The experimental re- suits showed that four major types ofmicrostructures were formed： dendritic, equiaxed, mixed, and multi-droplet microstructures. The simu- lated results and the available experimental data are in good agreement.展开更多
为研究渠道水生植被特征对渠内水力特性影响,设计了渠道模型试验,探讨了植被生长间距、入渠流量等因素影响下渠道水位、流速变化。试验表明,入渠流量对渠内断面水位变化特征影响较小,但植被生长间距特征会改变渠内断面水位变化,在间距为...为研究渠道水生植被特征对渠内水力特性影响,设计了渠道模型试验,探讨了植被生长间距、入渠流量等因素影响下渠道水位、流速变化。试验表明,入渠流量对渠内断面水位变化特征影响较小,但植被生长间距特征会改变渠内断面水位变化,在间距为10~15、20~30、35~40 mm 3个区段具有不同的水位变化趋势。入渠流量愈大,则水位愈高;但植被生长间距愈大,则渠内水位愈低。当植被生长间距不超过25 mm时,渠内流速变化具有增、降阶段,而在间距为30~40 mm时流速较稳定。植被生长间距愈大,则流速愈高。研究认为渠内水生植被应控制其分布密度与间距,以降低水生植被对渠内动水势能的影响。展开更多
对 1 1个不同遗传型烟草移栽期烟苗株高、叶片数、生物学产量及其地上、地下部分的分配量进行调查 ,并测定这些材料的过氧化物酶活力、苯丙氨酸解氨酶活力、水溶性蛋白质和 p H值。结果表明 :除 p H值外 ,所有指标在不同遗传型烟苗间都...对 1 1个不同遗传型烟草移栽期烟苗株高、叶片数、生物学产量及其地上、地下部分的分配量进行调查 ,并测定这些材料的过氧化物酶活力、苯丙氨酸解氨酶活力、水溶性蛋白质和 p H值。结果表明 :除 p H值外 ,所有指标在不同遗传型烟苗间都存在较大的差异。香料烟苗期生长速度显著快于烤烟。烤烟品种苗期的过氧化物酶活力低于香料烟 ,并且品种间的差异性也较小。普通烟草品种苗期的 p H值与过氧化物酶活力呈显著正相关关系 (r=0 .65 77)。展开更多
文摘China National Textile & Apparel Council released the latest industry reviews in its mid-year conference that in the first half of 2010,the textile industry kept its stable recovery and the whole situation was good;for the anticipation of late half,this industry would continue this tendency but growth speed might slow down.
文摘This study introduces space, transportation, and money into an economic growth model. Growth theory neglects the importance of transportation on economic growth and transportation economics fails to properly explain how changes in transportation conditions (such as technological improvement, infrastructure investment, and oil prices) affect long-term economic growth. By proposing a growth model with transportations, we try to explain effects of transportation on economic growth. Our model describes dynamic interactions among capital accumulation, travel time, housing, residential distribution, amenity, and endogenous time distribution among work, travel, and leisure. The study examines effects of inflation policy, transportation conditions, and other conditions on long-term economic growth and economic geography. The paper demonstrates a way to integrating some important models in the literature in economic growth theory, urban economics, and transportation research so that the significance of transportation systems upon economies can be properly analyzed.
基金the National Basic Research Program of China (No. 2011CB012902) for their continuing support to this research
文摘In this study, the microstructure evolution of rapidly solidified ASP30 high-speed steel particles was predicted using a simulation method based on the cellular automaton-finite element （CAFE） model. The dendritic growth kinetics, in view of the characteristics of ASP30 steel, were calculated and combined with macro heat transfer calculations by user-defined functions （UDFs） to simulate the microstructure of gas-atomized particles. The relationship among particle diameter, undercooling, and the convection heat transfer coefficient was also inves- tigated to provide cooling conditions for simulations. The simulated results indicated that a columnar grain microstructure was observed in small particles, whereas an equiaxed microstructure was observed in large particles. In addition, the morphologies and microstructures of gas-atomized ASP30 steel particles were also investigated experimentally using scanning electron microscopy （SEM）. The experimental re- suits showed that four major types ofmicrostructures were formed： dendritic, equiaxed, mixed, and multi-droplet microstructures. The simu- lated results and the available experimental data are in good agreement.
文摘为研究渠道水生植被特征对渠内水力特性影响,设计了渠道模型试验,探讨了植被生长间距、入渠流量等因素影响下渠道水位、流速变化。试验表明,入渠流量对渠内断面水位变化特征影响较小,但植被生长间距特征会改变渠内断面水位变化,在间距为10~15、20~30、35~40 mm 3个区段具有不同的水位变化趋势。入渠流量愈大,则水位愈高;但植被生长间距愈大,则渠内水位愈低。当植被生长间距不超过25 mm时,渠内流速变化具有增、降阶段,而在间距为30~40 mm时流速较稳定。植被生长间距愈大,则流速愈高。研究认为渠内水生植被应控制其分布密度与间距,以降低水生植被对渠内动水势能的影响。
