连续定态传热过程平均温差的统一推导

采用统一的方法对定态传热逆流和并流的平均温差进行了推导。推导过程无需假定冷热流体的特定流向,并利于得到对数平均温差“同侧相减”的规律。     

CILT2000: Visualization and Modeling

CILT2000 helped VisMod evolve from a collection of local and distinct research and development efforts into a solid field of education. Previous intellectual efforts focused around a) modeling and simulation tools, b) visual explanation tools, c) visual data analysis tools, d) exploring student needs in the context of VisMod, and e) exploring instructional frameworks for VisMod. These focus areas have evolved in two main trajectories, representing the evolution of the field, the generalization trend, which seeks to identify general principles and guidelines for designing learning environments, and the equitable application trend, seeking to use knowledge gained in the field to leverage education in general.     

当代青年审美倾向调查及分析

当代青年对经典文学艺术作品的认知度不高,但依然喜爱经典文艺作品。当代青年审美追求形象化,更倾向娱乐休闲性。     

人造金刚石提纯废水处理沉淀池的设计

本文对人造金刚石提纯废水进行了研究,在试验和分析的基础上,根据生产实际设计出科学实用的竖流式沉淀池,可对悬浮固体的有用成分进行回收,能取得一定的经济效益。     

Numerical investigation of cavitating flow behind the cone of a poppet valve in water hydraulic system

Computational Fluid Dynamics (CFD) simulations of cavitating flow through water hydraulic poppet valves were performed using advanced RNGk-epsilon turbulence model. The flow was turbulent, incompressible and unsteady, for Reynolds numbers greater than 43000. The working fluid was water, and the structure of the valve was simplified as a two dimensional axisymmetric geometrical model. Flow field visualization was numerically achieved. The effects of inlet velocity, outlet pressure, opening size as well as poppet angle on cavitation intensity in the poppet valve were numerically investigated. Experimental flow visualization was conducted to capture cavitation images near the orifice in the poppet valve with 30° poppet angle using high speed video camera. The binary cavitating flow field distribution obtained from digital processing of the original cavitation image showed a good agreement with the numerical result. Project supported by the National Natural Science Foundation of China (No. 59835160) and Scientific Research Foundation for Returned Overseas Chinese Scholars, State Education Ministry of China (No. 50175097)     

论城市文化形象的塑造

城市文化形象是城市文化的外在表征，更注重城市文化的外显性。城市文化形象具有地域性、交融性、集聚性和辐射性。良好的城市文化形象是城市无形的资产，是城市经济发展的推动力；凝聚着城市的灵魂，引导着市民的思维。研究城市文化形象特征，把握城市文化脉络的走向，设计和创造出充满地方特色、性格魅力和生命活力的现代城市形象。是城市文化形象塑造的重要任务。     

建立有效的内部会计控制体系

中国企业界的迫切任务是要运用先进的内部控制理论和方法,强化内部控制,提高管理水平。企业应当按照公司治理结构层次和企业内部会计控制目标的内容层次来设计企业内部会计控制制度,以便具体贯彻实施企业内部会计控制。     

物流业入世后过渡期营销创新研究

随着入世后过渡期的到来,市场开放将提速,并逐步取消外贸引入的地域限制、数量限制、股权限制等,这将对中国的物流业带来一定的影响。通过对中国物流业的SWOT和应对WTO 策略分析,营销创新对振兴中国物流业将起到积极的作用。     

自动调节阀流量特性实验的开发

介绍了自动调节阀流量特性实验的意义和基本原理,重点讲解了如何对原有的实验设备进行改造,以很少的花费、开发出新的教学实验项目所开展的工作。这项改进为丰富实验教学内容、提高实验设备的利用水平,促进理论教学与实际动手能力的训练起到重要作用。     

基于数据驱动原理的新型计算机系统结构的可行性分析

本文通过对传统的基于存储程序原理的冯·诺依曼计算机和基于数据驱动原理的新型计算机系统结构的数据流计算机的比较以及对数据流计算机的性能的分析,得出这种还处在萌芽阶段的数据流计算机是可行的,也是具有发展潜的.