排序方式: 共有42条查询结果,搜索用时 15 毫秒
31.
苟选民 《西安航空技术高等专科学校学报》2004,22(2):21-22,28
在探讨了新世纪我国高等职业技术教育发展目标的基础上 ,提出在发展过程中应树立以学生为中心 ,素质教育、弹性教育的办学理念 ,寻找新的发展途径。 相似文献
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玻璃熔制是一个非常复杂的物理变化、化学反应过程,为了获得高质量的玻璃制品,必须要稳定熔窑热工制度,即习惯上称的“四大稳”。为此整个熔制过程控制分为五个系统:窑温控制系统、窑压控制系统、玻璃液面控制系统、燃烧控制系统以及火焰换向控制系统。目前,自动控制技术对提高玻璃熔窑热效率、降低能耗和稳定生产过程的作用,已充分被人们所认识。本文介绍了玻璃熔窑自动控制的现状,归纳并分析了四大类中小规模计算机控制系统在玻璃行业的应用现状,并对玻璃熔密计算机控制的发展方向。提出了一些看法。 相似文献
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《中国航空学报》2021,34(2):54-78
Residual stress is one of the main factors affecting the mechanical properties of materials, such as their strength, plasticity and surface integrity. For instance, tensile stress conditions can adversely affect material performance or component life, while compressive stress conditions can improve material fatigue strength. During the processing of integrated aviation structures, machining deformation caused by residual stress has become one of the most prominent manufacturing problems. Therefore, it is very important to measure and evaluate the stress for real applications. This paper reviews the research of residual stress measurement methods over the past five years by classifying them according to the measurement methods appearing in each stage. The existing problems and difficulties of each measurement technology are summarized, and future trends are forecasted. This paper provides a reference for further in-depth study of residual stress measurement technologies. 相似文献
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随着航空航天工业的发展,紧固件越来越受到业内重视。聚焦世界航空航天工业发展现状及趋势,对国际航空航天工业发展情况、国外航空航天紧固件产业布局、主要供应商情况、发展现状及新产品开发进行叙述。分析了国内航空航天紧固件选材、种类及产品型谱,总结了近些年来国内航空航天紧固件在新产品研发、市场准入、质量控制等方面取得的成绩,对未来国内航空航天紧固件发展情况进行了预测。 相似文献
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Land information from remote sensing satellites contributes substantially to the quality of decision making in development activities. However, participation in space-related activities by developing countries has historically been low in part due to the high costs and advanced technology inputs required. The paper discusses several technological and socio-political trends which now offer increasingly affordable opportunities for developing countries to increase their level of participation in activities related to satellite remote sensing of earth resources. Benefiting from these opportunities requires appropriate encouragement and support from national governments. 相似文献
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Ewa Slominska Hanna Rothkaehl 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2013
The diurnal, seasonal and latitudinal variations of the electron temperature in the Earth‘s topside ionosphere during relatively low solar activity period of 2005 – 2008 are investigated. In order to examine seasonal variations and morphology of the topside ionospheric plasma temperature, CNES micro-satellite DEMETER ISL data are used. Presented study is oriented on the dataset gathered in 2005 and 2008. Within conducted analysis, global maps of electron temperature for months of equinoxes and solstices have been developed. Furthermore, simultaneous studies on two-dimensional time series based on DEMETER measurements and predictions obtained with the IRI-2012 model supply examination of the topside ionosphere during recent deep solar minimum. Comparison with the IRI-2012 model reveals discrepancies between data and prediction, that are especially prominent during the periods of very low solar activity. 相似文献
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介绍了美国空军2010年发布的"技术地平线"的出台背景、主要内容.并根据该研究报告浅析了美国空军未来的装备与技术趋向. 相似文献
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美国深空测控通信技术动向分析 总被引:1,自引:0,他引:1
文章详细介绍了美国深空测控通信技术的发展动向,并对其未来规划进行了较为详细的综述和分析。 相似文献