总线类测试系统的技术现状及发展方向

归纳了当前测试系统的主流总线架构形式,对当前各种总线架构的测试系统性能及应用进行了分析,同时对当前测试系统的主要软件设计技术现状进行研究。在此基础上,提出了未来复杂测试系统研制的主要方向,要满足未来复杂测试任务需求,应加大应用LXI总线构建大型高精度混合型分布式测试系统。硬件方面,将VXI/PXI/PXI-E/PCI-E/USB3.0总线进行组网集成,满足大型应用测试中低速、高速、高精度的数据采集与传输测试需求;软件方面,应按照行业标准需求,研制功能完备、满足特定行业应用的软件系统。     

典型装备备件消耗规律研究

目的制订合理的备件保障计划,提高备件保障工作的科学性。方法通过对某典型装备中正态寿命件和伽马寿命件修理方法的分析,依据更新过程理论以及概率论和数理统计方法,建立典型装备正态寿命件和伽马寿命件的消耗规律数学模型,并举例说明。结果通过示例,证明了建立的备件消耗规律数学模型具有较好的适用性。结论依据备件的消耗规律,可以为建制单位实现备件的精确化保障提供理论依据。     

特种设备安全监察的社会承受力分析

特种设备是保证安全生产和人们生活质量的重要因素。特种设备安全越来越受到人们的关注,其安全监察力度直接影响到设备的安全,进一步说,它影响到了安全生产和人们的生活。鉴于特种设备安全监察的重要性,对其社会承受力进行分析是相当有必要的。基于统计数据,对特种设备从业人员的承受力、公众的承受力及承受力的区域性展开研究分析,得知特种设备安全监察的社会承受力有所降低,且存在一定的区域性。     

基于改进TOPSIS方法的航空装备预研项目技术风险评估

技术风险是引发费用风险和进度风险的主要因素,因此在航空装备的研制中需要重点管控和规避。为提供可靠的航空装备预研项目技术方案的选择依据,采用改进的TOPSIS方法对五种不同航空装备预研方案的技术风险进行了定量评估,技术风险评价指标体系包括成熟性、复杂性、先进性、安全性、经济性、保障性、兼容性和标准化八个指标。利用熵值赋权法求得指标权重,双基点间的投影距离代替传统的相对欧式距离对TOPSIS方法进行了改进。实例分析中,通过编程计算对某航空预研项目的五种技术方案进行了定量风险评估,根据风险优属度确立了较为优化的技术方案。结果表明,该方法较主观赋权法更为科学、客观,为航空预研方案的初选提供了可靠参考。     

产业间设备投资关联性分析

通过理论与实证分析，本文说明了产业间设备投资关联性对ＧＮＰ的促进作用，可作为制定宏观经济政策的参考。     

An investigation of lifting operations on UK construction sites

Lifting operations and associated equipment have become commonplace within the UK construction industry. However, recent high profile accidents involving lifting equipment have shown that the result of its misuse can have serious cost and health implications.The main aim of the research was to investigate lifting operations on construction sites exploring different options, their effectiveness, and their effect on safety. This research looked into the processes in place; the factors that have to be taken into consideration when placing and using lifting equipment; and the competent persons required when operating equipment. With these aims, literature review was conducted. This was followed by investigation on three construction sites. These case studies were enhanced through interviews with general site staff, managerial staff, and appointed persons.The findings revealed six main points to improve safety in lifting operations. These are: through planning; training; equipment selection, use and inspection; feedback/communication; appointed person’s role; and database. Thorough planning of lifting operations has positive effects on safety. There is need for tighter accreditation of all qualifications in the lifting operations field. The charter of major lifting equipment from specialist contractors should be considered as industry best practise. Companies should avoid authoritarian working culture to facilitate efficient feedback to improve safety. The appointed person should have site based role. Site inspections and maintenance should be monitored on a national database form.Practitioners can benefit from this paper as it provides information on experiences from three construction sites. Furthermore, researchers can use the findings for their future studies.     

Influencing Factors of the Levels of Intensive Use of Typical Industrial Land

The article establishes an evaluation index system of the intensive land use from the perspective of enterprises. It is based on the questionnaire survey and evaluates the levels of the intensive use of the land in the electrical machinery and equipment manufacturing industry in Changzhou, Nantong, and Yancheng of Jiangsu Province. The evaluation result shows that there is obvious difference in the levels of the intensive use of the land in this industry in the three cities. The present article makes a detailed analysis on the causes of the difference. The analysis shows difference in results of the socio-economic and urban development stage, industrial features, population density, and technological progress. Finally, it proposes some suggestions to improve the efficiency of the industrial land use.     

Clogging of Filtering Material Systems Used for Disposable Respirators

The article shows the problem of clogging in connection with the parameters of filtering materials used in respiratory protective equipment. The results of investigations of airflow resistance changes during the depositing of dust inside the filtering material are presented. The configuration of layers differing in mass per unit area and the number of layers, were taken into consideration. For each configuration, the clogging abilities and the changes of airflow resistance as a reason of loading with dust were assessed. The analysis of tested materials confirms the hypothesis that there is an important coincidence between the properties of the material used in filtering equipment and the clogging coefficient. The results show that the filter should have a layered structure and that the outer layer should be made of a nonwoven of relatively high surface density.     

Lean framework for planning redesign proposals to optimise EOL environmental behaviour in WEEE products

The aim of this research was to define a sequence of actions to guide redesign propositions for electrical and electronic equipment products, which minimise negative consequences to the environment after the end of their useful life. Current practices mainly encourage the examination of individual problems as disassembly process and identification of suitable product end-of-life (EOL) treatment strategies. There also exist previous studies that try to incorporate EOL concerns in product design phase. In most cases, the main problem is the limited available EOL information because of its delayed retrieval. The proposed method focuses primarily on minimising this problem. The steps of the analysis performed include the selection of the optimal EOL treatment strategy and, afterwards, the evaluation of its results concerning the environment. In parallel, product design characteristics are grouped and examined concerning their expected significance for the environment in the EOL stage. The results from the previous stages are combined and product improvement actions are proposed for further examination in the redesign stage. The general framework used to conduct all these actions is lean thinking methodology. In the end, results concerning the application of the proposed method on a distribution transformer are presented.