Constrained Bézier curves'' best multi-degree reduction in the L2-norm

In computer aided geometric design, the degree reduction of the parameter curve is a key technique in data exchange and data compression. The various existing methods of degree reduction cannot decide whether the degree reduction curve satisfying the given tolerance exists beforehand, cannot give approximation of the best multi-degree reduction, or cannot provide explicit expression and error formula of the degree reduction curve. In this paper, we propose an entirely new method, which can hurdle the above flaws completely. For a given Bézier curve of degree n, we can easily decide whether a Bézier reduction curve of degree m exists, which has equal derivatives with the given curve up to (r-1)-th and (s-1)-th orders (r,s≤m) respectively at the endpoints, so the approximating error is less than the given tolerance ε in the L2-norm. If the curve exists, the explicit expression can be given.     

基于工作设计的知识型员工激励机制研究

在分析知识型员工工作偏好的基础上,结合工作的内在激励效用设计了其效用函数,利用委托代理框架,分析了知识型员工挑战性工作激励与金钱激励的相互作用关系.结果表明,无论信息完全与否,挑战性工作均能在一定意义上替代金钱对知识型员工的激励作用;信息不完全时,挑战性工作还能够增强知识型员工抵抗报酬风险的能力.最后给出了实证分析,并得出了知识型员工挑战性工作的设计原则与方法.     

High-voltage transmission tower-line system subjected to disaster loads

The high-voltage power transmission system is an important lifeline structure. It is significant for wide researches on the features and ability of the system subjected to earthquake and environmental loads. The promising prosperity of the system has been demonstrated around the world. The corresponding advances of the system with respect to the mechanism of loading action, analytical methods, experimental research measurements, structural vibration control, fatigue damage, lifetime prediction, and design methods are comprehensively discussed herein. Finally, further research work on dynamic response characteristics of high-voltage transmission tower-line system in the near future is predicted.     

User Driven Innovation in the Building Process

During the late years there has been an ever-increasing focus on the possibilities to change the building process to raise quality on the final building products as well as the activities of actors involved in the building process. One reason for this interest is the new opportunities evolving due to introduction of advanced information and communication technology (ICT). The paper focuses on creative changes of the building process powered by user driven innovation activities. An overview of existing user driven innovation methodologies is given as well experiences from the ongoing Virtual Innovation in Construction (VIC) project. One important driving force for change is the opportunity for users to develop and articulate real needs concerning for example different functionalities of a building and its parts, but also on artifacts supporting the actual needs capture and requirements formulation during building design. A general methodological framework and meta ontology for Virtual Innovation in Construction is presented as well as findings from implementation of the method.     

Basic rules for rheologic forging process of semisolid alloy

Semisolid mold forging is a major type of semisolid processing, which is different from neither traditional mold forging nor traditional permanent casting. However, processing defects are often seen in work pieces because of lacking available rules for the process design and control. Some basic rules for the process design and control, simply named the shortest flowing length, pressure filling and the minimum uplifting mold pressure, are advanced in the paper based on amount of researches and experiments. The equations to determine the major process parameters are given out such as the filling pressure, forming pressure and locking mold pressure for the process design and control. The rules and equations are experimentally proved available and applicable by several actual work pieces produced by the semisolid forging process.     

实验动物遗传质量监测技术研究进展与应用

摘要:遗传质量监测是实验动物质量控制的重要内容之一,也是发现实验动物遗传变异及保障动物质量符合要求的重要手段。 随着科学技术发展,尤其是生物科学的不断进步,实验动物遗传质量监测技术也从形态学遗传标记发展到 DNA 分子水平,越来越趋于准确、简便和快速。 本文梳理了实验动物遗传质量监测技术沿革,分析比较了各项技术的优点和局限性,并对其应用前景进行了展望。     

Design and Maxwell 3D simulation of small permanent magnetic actuator

According to the magnetic circuit design theory and performance requirements of magnetic field, an H-type permanent magnetic actuator that generates uniform magnetic field larger than 0.4 T in the interested re- gion has been designed in this paper. The static magnetic field simulation analysis was done by Ansoft＇ s Max- well three-dimensional （3D） software. The simulation results showed that the magnetic field of this system can meet the requirements, and this permanent magnetic actuator designed in this paper can be used in small nuclear magnetic resonance （NMR） svstem.     

从毕业设计谈力学教学问题

针对学生毕业设计论文反映出来的问题,指出了力学教学中存在的一些不足;针对目前教学改革的形式,分析了力学教学面临的新情况,提出了切实可行的方法和措施.     

New product design strategies with subsidy policies

Industrial development can enrich people’s lives,but it also causes environmental pollution,which is an area of significant concern among governments,consumers,and companies.Governments formulate some environmental policies,which motivate industry by providing greater incentives for green product development.Consumers are classified into two groups - ordinary and green market segments - according to their environmental awareness and attitudes.In this regard,companies need to reconsider their primary product design strategies.By investigating the interactions among customers’ preferences,firms’ product strategies,and government subsidy policies,this paper presents a theoretical model for new product design strategies.After detailed theoretical analysis of such strategies,we found that to motivate firms to choose environmentally friendly product design strategies, governments should inaugurate effective subsidy policies.After simultaneously considering environmental issues and firms’ benefits,we designed a subsidy policy.With such a policy,firms can change their primary product design strategies and develop both green and ordinary products,thereby increasing the firms’ profits and improving the total environmental quality.     

Taizhou Yangtze River Bridge—the first kilometer level three-pylon two-span suspension bridge in the world

Taizhou Bridge, located at the middle of Jiangsu Province, connecting Taizhou City and Zhenjiang City, started in Dec. 2007. The bridge is the first kilometer level three-pylon suspension bridge in the world, and it adopts longitudinal herringbone shape steel middle pylon for the first time in the world. The foundation of the middle tower is the deepest underwater caisson in soil on earth. A great many of technical innovations such as the design techniques of three-pylon suspension bridge,precisely locating and bottom-sealing techniques of the large scale caisson foundation, manufacturing, combination techniques of steel and concrete in the middle tower, welding of extra thick steel plate, manufacture and control techniques of abnormal sections of the middle tower and so on were introduced.