共查询到20条相似文献，搜索用时 93 毫秒
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由微悬臂梁结构组成的红外焦平面阵列(FPA)是基于微机电系统结构的非制冷型红外成像系统的核心技术,通过对双金属悬臂梁应力和应变的分析,阐述了影响微悬臂梁热机械性能的主要因素,为正确选择微悬臂梁结构的材质提供理论依据. 相似文献
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梁明富 《扬州职业大学学报》2010,14(4):33-36,41
以微悬臂梁的制作工艺为例,针对双材料悬臂梁加工中因为粘附现象造成废品率高的问题,分析了微悬臂梁加工中粘附影响因素,指出表面作用力和残余应力是造成粘附的主要原因,并提出相应控制措施。 相似文献
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在FPA中双材料悬臂粱进行合理简化的基础上,建立了FPA中双材料悬臂梁的三维有限元模型。运用ANSYS8．0的热分析功能对成像过程中FPA中双材料悬臂梁的工作环境进行了定量热分析,给出优化设计红外成像元件的思路及依据。 相似文献
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王青萍 《湖北第二师范学院学报》2011,(8):38-40
压电能量收集是微能量领域的研究热点。为了优化压电能量收集器的设计并提高其输出电压,对压电单晶悬臂梁进行了有限元仿真与分析,包括对压电单晶悬臂梁的最大应力,产生的最大电压,以及压电晶片的长度、基板的材质和压电晶片的粘结位置对输出电压的影响都作了详细的研究。仿真结果表明,有限元方法能为压电能量收集器件的优化设计提供重要的理论指导。 相似文献
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为制备表面带亲水性功能基团的磁性聚苯乙烯微球,用无皂乳液聚合方法,以过硫酸钾为引发剂,丙烯酸为稳定剂,制备出单分散的聚苯乙烯微球,在聚合物乳液中,用硝酸钾和氨水氧化硫酸亚铁制得表面修饰四氧化三铁的聚苯乙烯微球,制成磁性功能材料.用红外光谱(IR)、热重量法(TGA)、X射线衍射谱(XRD)和透射电镜(TEM)对合成样品进行了分析.结果表明,实验所得的样品为高品质的、表面单一分散的磁性聚苯乙烯微球,IR光谱在3030～2800,1600,1491.30,1449.42,735,698 cm-1处出现了聚苯乙烯的特征红外吸收,630 cm-1处为聚苯乙烯微球表面的Fe3O4的红外特征吸收;TGA曲线较好地解释产品的热失重现象;XRD谱出现了Fe3O4的特征衍射峰;TEM观察到大小均一、高分散的微球表面已附着Fe3O4磁性微粒. 相似文献
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基于欧拉-伯努利梁理论,设计了一种新型的微型同位素辐射能收集器二维机电模型。该模型解决了一维机电模型无法涵盖的诸多问题。算例分析表明:本模型能较准确地描述实验过程和预测实验结果。通过对结果进行分析,得出了影响微悬臂梁的位移、梁的往返周期和梁中存储能量的一系列因素。 相似文献
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陈颖 《广东广播电视大学学报》2010,19(4):110-112
针对在自由端作用集中荷载的悬臂梁,通过一定的合理简化,建立了悬臂梁的平衡微分方程,并采用近似解法,利用改进的欧拉公式,推导出了悬臂梁失稳临界荷载的计算公式,同时利用ANSYS程序对算例进行了分析,所得结果与理论计算值吻合较好。 相似文献
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吸收微波与红外能量的微陶瓷球 总被引：4，自引：0，他引：4
时杰 《中国科教创新导刊》2000,(2)
美国SDS（SpectralDynamicsSystems）公司生产的微陶瓷球粉末能吸收微波能量,把它添加在普通的漆中,再把漆喷涂在飞机和车辆上,就可减小它们的雷达与红外特征,即提高隐形能力,还可以涂覆在电子设备上来对付电磁干扰。SDS公司生产的微陶瓷球粉末名为Cenosphere,由覆有金属的微空心陶瓷球组成。这家公司生产的粉末不仅能吸收一些特定频率的电磁波,而且采用金属覆层可同时吸收雷达和红外能量。微陶瓷球粉末所吸收能量的频率由空心球的直径、用于涂覆球的金属及其厚度确定。Cenosphere球直径的范围为5－75微米,是以烧煤电厂的飞及… 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
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Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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YANGShiguo 《重庆大学学报(英文版)》2004,3(1):86-88
The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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GUO Bao-feng Xiao Da-wei 《重庆大学学报(英文版)》2005,4(3):129-133
Using virtual reality for interactive design gives a designer an intuitive vision of a design and allows the designer to achieve a viable, optimal solution in a timely manner. The article discusses the process of making the Virtual Reality System of the Humble Administrator＇s Garden. Translating building data to the Virtual Reality Modeling Language （VRML） is by far unsatisfactory. This creates a challenge for computer designers to do optimization to meet requirements. Five different approaches to optimize models have been presented in this paper. The other methods are to optimize VRML and to reduce the file size. This is done by keeping polygon counts to a minimum and by applying such techniques as object culling and level-ofdetail switching. 相似文献