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对光敏树脂的合成、对光敏树脂合成稳定性,UV-800光油的配制进行了研究,探讨了改性剂对树脂粘度,环氧丙烯酸克分子比对树脂粘度、固化性能,反应温度对树脂粘度,终点酸值对树脂粘度,催化剂品种、用量的选择光敏树脂合成的影响以及光引发剂、UVC-90紫外光固化机、单体交联剂、阻聚剂对稳定性、空气阻聚防止剂、流平剂种类及用量对UV-800光油配置的影响。 相似文献
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通过分析汽车振动源和人体对振动的反应,利用模拟技术,建立了十三自由度人-椅-车系统的动力学模型,运用随机振动理论给出了振动形态、传递函数、车轮的动载荷、座椅加速度等参量,并利用已有的汽车数据,对汽车行驶时的振动特性进行了模拟,得到了如下结论:发动机与轮胎刚度、减振器阻尼对后排座椅处的振动影响不大;后排座椅的垂直刚度增加很大时,对垂直方向振动影响比较大;后桥刚度、阻尼对后排座椅处的振动影响较大,后轮胎刚度增加,则振动加强;后桥刚度对汽车平顺性有一定影响,后桥的刚度减小,则后排座椅处垂直加速度相应减小,使用该模型可对汽车行驶平顺性进行预测或评估。 相似文献
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本文首先对热能动力系统的组成进行总结,明确了热能动力系统的重要性。然后从规划设计、总体设计、工程施工设计、完善设计各个方面对热能动力设计进行分析探讨,明确了规范设计程序的重要性,详细阐述了热能动力系统设计的程序,对以后热能动力系统设计提供了全面的有效的设计方案。 相似文献
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随着我国经济的迅速发展,人们的居住条件也得到了改善和提高,对居者有其屋的要求也不再是只要有房住、通水通电就可以了,人们在购买住房时,除了关注住宅的楼层、户型、面积等因素外,同时也将更多的注意力放在了住宅设备上,给排水系统的设计是否合格、合理、合人心,对住户今后的装修、日常使用与维护将产生重要的影响.这就对我们这些从业人员提出了更高的要求: 相似文献
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固相接枝法合成PC-g-PS及其对PC/PS共混体系的增容作用 总被引:5,自引:0,他引:5
研究了双酚A聚碳酸酯(PC)与苯乙烯(St)固相接枝共聚合,考察了St/PC配比、引发剂浓度、反应时间和温度对共聚合的影响,获得了接枝率为30%,接枝效率为67%的接枝共聚物,并对接枝共聚物进行了IR、DSC、DMA等表征,测定了支链PS的分子量及枝数,并研究了该接枝共聚物对PC/PS共混体系的增容作用。 相似文献
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近年来,新疆自治区先后对一些储量丰富、煤层赋存条件好的矿井进行了改扩建,本文根据恒泰煤业有限公司恒兴煤矿实际,对其矿井开拓方案进行了分析和探讨,对建设安全、稳产、高效的矿井意义重大。 相似文献
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Chien Hsiang Liao 《Scientometrics》2011,86(3):747-761
Better research quality not only inspires scholars to continue their research, but also increases the possibility of higher
research budgets from sponsors. Given the importance of research quality, this study proposes that utilizing social capital
(i.e., research collaboration) might be a promising avenue to achieve better research quality. In addition, as every scholar
has his or her own expertise and knowledge, the diversity of collaborating members might be an extra resource for reinforcing
research quality. The purpose of this study is to investigate the impact of research collaboration and member diversity on
research quality, including the number of citations, the impact factor, and the size of the research award. To explore unknown
associations, the author adopts two data sources, that is, the Social Science Citation Index database and academic database
of a university, to verify the hypotheses. The results show that a higher intensity at which scholars are embedded in a collaboration
network, results in higher research quality. However, member diversity does not seem to be a major concern during the organization
of a research group. Research quality is not affected, regardless of whether a scholar collaborates with different or the
same co-authors. 相似文献
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How to measure the quality of conceptual models is an important issue in the IS field and related research. This paper conducts a review of research in measuring conceptual model quality and identifies the major theoretical and practical issues that need to be addressed in future studies. We review current classification frameworks for conceptual model quality and practice of measuring conceptual model quality. Based on the review, challenges for studies of measuring the quality of conceptual models are proposed and these challenges are also research points which should be strengthened in future studies. 相似文献
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Transferring and applying manufacturing principles and practices to improve both service efficiency and service quality is an important area of research in service operations. This paper advances this stream of research by examining the compatibility of operating efficiency and service quality. Specifically, our research addresses the following questions: (1) Do operating efficiency and service quality have to be traded off, or can they exist in unison (are they compatible)? and (2) What aspects of service quality have a stronger association with operating efficiency? In disentangling these important issues, we utilise a combination of data envelopment analysis (DEA) and survey-based empirical research methods. Additionally, our focus lies on a novel type of service industry where such research has been sparse. We evaluate the relative operating efficiencies of service driving agencies based on actual transaction data and subsequently analyse differences in service quality dimensions based on efficiencies. Overall, our analyses suggest important strategic decision-making implications for service operations managers and provide novel insights for academic research. 相似文献
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For a long time, rankings overused in evaluating Chinese universities’ research performance. The relationship between research
production and research quality hasn’t been taken seriously in ranking systems. Most university rankings in China put more
weight on research production rather than research quality. Recently, the developmental strategy of Chinese universities has
shifted from ‘quantity’ to ‘quality’. As a result, a two-dimensional approach was developed in this article to balance ‘quantity’
and ‘quality’. The research production index and the research quality index were produced to locate research universities
(RU) from Mainland China, Hong Kong (HK) and Taiwan (TW) in the two-dimensional graph. Fifty-nine RU were classified into
three categories according to their locations, which indicated the relevant level of research performance. University of Hong
Kong, National Taiwan University, Tsing Hua University and Peking University appeared to be leading universities in research
performance. The result showed that the mainland universities were generally of higher research production and lower research
quality than HK and TW universities, and proved that the merging tides of Chinese universities enlarged their research production
while causing a low level of research quality as well. 相似文献
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In recent years, research information systems (RIS) have become an integral part of the university’s IT landscape. At the same time, many universities and research institutions are still working on the implementation of such information systems. Research information systems support institutions in the measurement, documentation, evaluation and communication of research activities. Implementing such integrative systems requires that institutions assure the quality of the information on research activities entered into them. Since many information and data sources are interwoven, these different data sources can have a negative impact on data quality in different research information systems. Because the topic is currently of interest to many institutions, the aim of the present paper is firstly to consider how data quality can be investigated in the context of RIS, and then to explain how various dimensions of data quality described in the literature can be measured in research information systems. Finally, a framework as a process flow according to UML activity diagram notation is developed for monitoring and improvement of the quality of these data; this framework can be implemented by technical personnel in universities and research institutions. 相似文献
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N. K. Avkiran 《Scientometrics》1997,39(2):173-184
The study reports an empirical comparison of quality of collaborative research with the quality of individual research. Quality
of a paper is measured by the citation rate over the four years following the year of publication. Papers published in fourteen
Finance journals between 1987–1991 are sampled. There is no significant difference between the quality of collaborative and
individual research. Decision-makers should hesitate in interpreting collaborative research as a definitive sign of ability
to produce better research. 相似文献
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现有研究仅关注单一服务商的质量承诺决策,而忽视多个服务商关于服务价格和质量承诺的竞争策略。为弥补这种研究不足,本文的研究并不仅停留在单一的服务承诺研究,而是扩展到服务价格层面进行综合研究,以此探讨服务商竞争策略。本文构建3种竞争模型,并运用最优化方法研究,得到结论如下。1) 在基于服务价格的竞争模型中,当质量承诺水平一定时,一旦有服务商涨价,其他服务商会制定相同的决策。然而,一旦有服务商提高质量承诺水平,其他服务商会制定降价决策予以应对。2) 在基于质量承诺水平的竞争模型中,当服务价格一定时,一旦有服务商提高质量承诺水平,其他服务商会适当地降低质量承诺水平来减少服务失败时的补偿。一旦有服务商从服务价格层面提升竞争力,那么,为应对这种竞争策略,其他服务商就会从质量承诺方面进行补偿。3) 本文基于服务竞争策略研究而建立了竞争模型,从模型研究中发现,各个服务商之间必然存在纳什均衡。本文对服务市场竞争环境下,关于服务价格和质量承诺的竞争策略的制定有一定的实践指导意义。 相似文献
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声品质的研究是近年来的新兴研究方向,并已成为国内外的研究热点。本文在给出声品质研究内涵的基础上,从主观评价分析方法和声品质参量两个声品质研究的主要方面,介绍了国内外近年来的研究进展和存在的问题以及研究发展方向。同时,介绍了声品质在产品噪声改善方面的应用研究的情况。 相似文献
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我国对质量风险的研究还处于起步阶段,如何建立质量风险管理推进产品不断改进和完善是一个值得研究的问题。本文介绍了质量风险管理的概念,阐述了企业推行质量风险管理的具体流程,希望能将风险管理融入质量管理中并不断持续改进,提高企业质量风险的应对和控制能力。 相似文献
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There is a growing literature measuring research excellence in economics. The h-index is noteworthy in combining quantity
and research quality in a single measure of researcher excellence, and its ability to be extended to measure the quantity
and quality of the researchers in a department. We extend the use of the first successive h-index further to measure the quality
of graduate education, specifically excellence in research supervision, based on publication and citation data for individual
researchers ascribed to their graduate supervisors. 相似文献