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作为一类用于开凿平直地下巷道的机器,掘进机在矿山开采领域得到了广泛的推广和应用.本文从对掘进机总体参数的确定入手,从几侧面具体论述了悬臂式掘进机的设计方法和原则. 相似文献
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本文对VBA技术与机械手技术作简要介绍,并且利用AUTOCAD作为软件平台,实现了VBA技术在机械手设计中的运用。 相似文献
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随着市场经济的发展,人们的经济水平越来越高,各种建筑屋也越来越多。但是最多的还是民用建筑。在其建设的各个环节中,设计环节是其中重点之一。民用建筑的结构设计大大影响着其再建筑过程中的成本造价,结构设计优化技术的应用可以节约成本,从根本上产生可观的经济效益。民用建筑的设计部门和设计人员应当严格遵守“经济、合理”等原则,应用先进的现代化设计理念,设计合适的房屋建筑方案,实现降低工程造价,实现经济利益最大化。 相似文献
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本文简要介绍了某水电站的挡水建筑物面板堆石坝,本文就大坝的结构设计、坝料设计、趾板、面板和止水设计、地基开挖和基础地理等作介绍。 相似文献
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多层建筑框架结构设计是结构设计中较为基本的设计,也是建筑结构设计中较为重要的一种形式.本文对多层建筑框架结构设计时常遇到的问题进行分析并探讨具体解决措施. 相似文献
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赵修强 《中国对外贸易(英文版)》2011,(12)
建筑材料的发展跨越了漫长的社会生产实践和科学研究历程,已形成一个庞大的、品种众多的材料体系.如墙体材料、装饰材料、防水材料、保温材料等.因此新型建筑材料的应用势在必行.对新型防水材料在建筑中的应用进行分析研究,仅供同行参考. 相似文献
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空气板线馈电网络由于具有损耗小、耐功率高、幅相控制容易等特点而广泛应用于平面阵列天线中.天线辐射单元与空气板线馈电网络结构一体化,结构紧凑、集成度高,便于制造和装配,可大大降低成本和周期.文中介绍了两种天线单元形式及仿真结果,给出了一种天线单元及由其组成线阵的试验结果,表明其具有良好的性能,满足实际使用要求.其设计思想具有良好的扩展性. 相似文献
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In the present study of microwave oven ownership and use, three hypotheses were tested with data from 100 households in London, U.K. and 100 households in Atlanta, Georgia. The data were collected with a survey instrument administered by door-to-door interviews. The results of the study show that microwave owners are younger, have higher incomes, Larger families, and are more innovative than non-owners. The study also revealed that country of residence made a great difference in level of use. Households from Atlanta, Georgia, are younger, have larger families, have microwaves with many more features, and have owned a microwave longer than low level microwave users. The research reinforces the need for cross-cultural studies of this type. 相似文献
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以红外热源的辐射热来热熔镀在印制电路板上的锡铅合金,具有很多的优点.本文着重对实施这一热熔工艺的专用设备——红外热熔机的整机造型、人机关系、各主要部件的功能和结构设计,作了较为详细的分析. 相似文献
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Jan Peeters 《Intereconomics》1986,21(6):288-294
The long-term financing of social security faces considerable problems which give rise to the question whether wages can and should continue to serve as the only assessment basis for social security contributions. The calculation of, at least, the employers’ contributions on a broader value added based foundation seems to offer a plausible alternative: human labour is being replaced more and more by technology: its value added could be used for financing social security. What would be the economic effects of such a “machine contribution” on employment, competitiveness and growth? 相似文献
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高云翔 《中国对外贸易(英文版)》2010,(24)
供电企业管理的一个重要部分就是物资采购管理.其能否规范化的运行时关系到供电企业良好发展的一个重要方面.所以对于物资采购供应方面必须要进行现代化管理,这样才能进一步提高公司运作的水平,增加公司的收益.所以本文从电力企业物资采购.管理的问题和解决方式进行了探讨. 相似文献
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周成华 《中国对外贸易(英文版)》2010,(24)
网络招标采购是应用当代网络信息技术对传统招授标采购方式优化升级的有益探索,是阳光采购招标工作在信息化时代高速发展的积极实践;本文介绍了华电集团招标采购网的基本功能结构和在广安电厂物资采购中的实际应用情况,对网络招标采购的优越性和所遇到的问题作了总结并提出了相应的措施. 相似文献
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对比分析了垂直轴洗衣机和水平轴洗衣机的洗衣性能和节能节水性能,讨论了美国、欧洲和中国的洗衣机性能和能效标准,并提出了相应的标准优化建议。 相似文献
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This paper examines the competitive characteristics of U.S. manufacturers in the machine tool (MT) industry. After several decades of decline, this industry has recently shown signs of a modest but sustained recovery. Empirical evidence from a national survey of 104 MT producers suggests that the revival of this sector has been driven by a combination of factors, including renewed export involvement, improved customer support, and better product design. Although most MT companies are small-to-medium-sized enterprises (SMEs), the survey data show that very small SMEs are poorly represented in the recovery thrust of the industry as a whole. Our principal conclusion is that the MT industry has been following an export-led path toward stabilization, but that certain types of small producers are unlikely to thrive for very long. The most serious problems facing small producers include shrinking local markets, import competition, shortages of skilled labor, and cyclical demand. 相似文献