压铸镁合金在曲轴箱上应用的材料替代研究

以摩托车曲轴箱为例,对铸造镁合金在摩托车上应用中的材料替代技术和方法进行了系统研究.研究结果表明,通过铸件服役工况及失效形式分析,铸件服役模型建立及服役状态分析,以铸件本体材料使用性能为基础的结构再设计,铸件生产工艺虚拟现实及优化,镁合金样件生产及使用性能检测等步骤,可以合理实现镁合金铸件在摩托车上应用中的材料替代.     

多联产系统:综合解决我国能源领域五大问题的重要途径

在21世纪，我国的能源领域面临能源供应、液体燃料短缺、环境污染、温室气体排放和农村能源结构调整五大问题。以煤气化为核心的多联产系统是综合解决这五大问题的重要途径。     

Life cycle cost and energy analysis of a Net Zero Energy House with solar combisystem

The Net Zero Energy House (NZEH) presented in this paper is an energy efficient house that uses available solar technologies to generate at least as much primary energy as the house uses over the course of the year. The computer simulation results show that it is technically feasible to reach the goal of NZEH in the cold climate of Montreal. In terms of the life cycle energy use, which considers the operating and embodied energy of the house, the energy payback time is 8.4–8.7 years, when the NZEH is compared with an average house that complies with the provincial code. The energy payback ratio of the combisystem is 3.5–3.8 compared with the heating system of conventional house. By converting solar energy, the combisystem supplies at least 3.5 times more energy than the energy invested for manufacturing and shipping the system. The life cycle cost analysis of the NZEH shows, however, that due to the high cost of the solar technologies and the low cost of electricity in Montreal, financial payback is never achieved.     

降低轻油泵房油蒸气浓度的措施

分析了轻油泵房产生油蒸气的原因,介绍了有关降低轻油泵房油蒸气应采取的措施。     

Solving House Allocation Problems with Risk-Averse Agents

This paper solves the fair and optimal house allocation problem (Sun and Yang, Econ Lett 81:73–79, 2003) when the agents preferences are represented by nonlinear utility functions using techniques for global mixed integer nonlinear optimization. A small simulation study indicates that if quasi-linear specifications are adopted as approximations to nonlinear utility functions and if the fair and optimal allocation is identified based on this approximation, then the prices are typically higher on average and the resulting allocation is typically non-fair.     

A methodology of determining aggregated importance of engineering characteristics in QFD

Quality function deployment (QFD) is a planning and problem-solving tool that is gaining acceptance for translating customer requirements (CRs) into engineering characteristics (ECs) of a product. Deriving the importance of ECs is a crucial step of applying QFD. However, the inherent fuzziness in QFD presents a special challenge to effectively evaluate the importance of ECs and correlation among them. Furthermore, degree of impact of an engineering characteristic (EC) on the other ECs also reflects the importance of the ECs. In previous studies, those impacts were neglected or simply represented using a linear combination in determining the importance of ECs. To address this issue, in this paper, a new methodology of determining aggregated importance of ECs is presented which involves the consideration of conventional meaning of importance of ECs as well as the impacts of an EC on other ECs. In the proposed methodology, fuzzy relation measures between CRs and ECs as well as fuzzy correlation measures among ECs are determined based on fuzzy expert systems approach. These two types of measures are then used to determine the aggregated importance of ECs. An example of design of a digital camera is used to illustrate the proposed methodology.     

太原第一热电厂厂用系统的改进

分析现有厂用电系统及公用系统的供电可靠性,提出详尽可行的改进方案,使系统更加适应长远的运行方式。     

关于锅炉房凝结水回收率的计算

供热锅炉房凝结水回收率是选择离子交换器的已知数据.以前,在计算该数据时,采用的是“试算法”,需要反复计算多次,才能算出凝結水回收率.现在,将锅炉排污率、除氧器所使用的新蒸汽量和软化水量都写成以凝结水回收率为自变量的函数式.将上述函数都代入除氧器的热平衡方程式里,解该方程式,算出凝结水回收率,方法简便.     

财务质量屋的设计与应用研究

借鉴并行工程中质量屋的设计与应用机理,设计了财务质量屋,建立了财务要求质量与财务质量要素的关系矩阵和财务质量要素间的相关矩阵,提出了企业财务质量评价和确定企业财务质量改进关键环节的一种新型分析方法。