无网格法与有限元法的比较教学

在有限元法的教学中同时向学生介绍无网格法的基本原理,比较有限元法和无网格法的计算结果,可使学生清楚地认识到应用广泛的有限元法的局限性,以及无网格法在某些特定领域的潜在应用前景.     

Formation of ζ phase in Cu-Ge peritectic alloys

Rapid growth behavior of ζ phase has been investigated in the undercooling experiments of Cu-14%Ge, Cu-15%Ge, Cu-18.5%Ge and Cu-22%Ge alloys. Alloys of the four compositions obtain the maximum undercoolings of 202 K（0.17TL）, 245 K（0.20TL）, 223 K（0.20TL） and 176 K（0.17TL）, respectively. As the content of Ge increases, the microstructural transition of ＂a（Cu） dendrite ＋ ζ＂ peritectic phase → ζ＂ peritectic phase →, ζ dendrite ＋ （ε＋ζ） eutectic＂ takes place in the alloy at small undercooling, while the microstructural transition of ＂fragmented α （Cu）dendrite ＋ ζ peritectic phase →, ζ peritectic phase →ζ dendrite ＋ ε phase＂ happens in the alloy at large undercooling. EDS analysis of the Ge content in peritectic phase indicates that undercooling enlarges the solid solubility of ζ rdendrite, which leads to a decrease in the Ge content in ζ phase as undercooling increases. In the Cu-18.5%Ge alloy composed of ζ peritectic phase, the Ge content in ζ phase increases when undercooling increases, which is due to the restraint of the Ge enrichment on the grain boundaries by high undercooling effect.     

Research on Key Techniques of Collaborative Design System

The development of product is a complex process. Collaboration is necessary to this process to support multi-function teams' participation in this process at the same time. Effective task decomposition is the prerequisite of collaborative design and constraint network was used to express the relationship among design participants. In order to make the coupling collaborative design go smoothly, a constraint satisfaction model based on dynamic constraint is put forward. An integrated-based conflict resolution model is advanced to resolve the complex conflict during the process of collaborative design.     

缩合多环芳烃树脂固化机理

以萘为原料，在酸性催化剂作用下合成出缩合多环芳烃树脂，对其结构进行了表征，采用ＤＳＣ和ＴＧ研究了其固化机理及固化产物的热稳定性。     

电磁无心夹具的设计与调整

电磁无心夹具是进行薄壁套圈、轴衬套等中小型回转体零件磨削加工的高效夹具.本文阐述了这种夹具的设计原理、方法与调整参数,为工厂设计与改进电磁无心夹具提供了技术方案.     

田径运动员的心率与运动成绩的关系

针对田径运动员几个生理指标的变化，分析训练距离对心率的影响、心率和运动成绩等关系，探讨体育训练的科学方法。     

强化企务公开促进企业和谐——试论企务公开在构筑和谐劳动关系中的作用

企务公开是我国法律法规明文规定的保障职工权益的企业义务之一,它在构筑和谐劳动关系中的作用不容忽视.本文对此浅谈几点个人看法.     

三维头发造型系统的设计与实现

根据悬臂梁模型，建立头发的弯曲模型；运用外力控制头发的弯曲；提出以椭球为头壳生成头发模型，并将其移植到实际存在的头部模型上的方法；并设计一个头发造型系统．     

荔枝保鲜研究1：——低温储存下抑制失水与防霉

本文研究荔枝保鲜过程中抑制荔枝失水和防霉问题。用含５％的瑞毒雷猛锌的保鲜液浸渍处理荔枝约５ｍｉｎ后，取出凉干。密封于装有吸潮－保温－乙烯吸收保鲜剂容器中，５℃￣８℃下储存。储存５０天后，好果率约８６％，货贺期约３０小时。     

浅析胡萝卜直播覆盖采种法

叙述了胡萝卜直播覆盖采种法比常规采种法具有种子产量高、品质好、成熟一致和节省人力的突出优点．介绍了胡萝卜直播覆盖采种法的科学施肥、小株采种、合理密植、地膜覆盖、主茎留种、加强管理等主要配套技术要点。