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本文应用 SEM(扫描电子显微镜)研究了制备碘化铯光阴极时基底的温度,真空烘烤和露置大气对光阴极的微观结构的影响。 相似文献
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蚌壳的层次结构与生物矿化机制 总被引:1,自引:0,他引:1
蚌壳微观结构和生物矿化机制的研究以材料的仿生设计、软体动物分类学,考古,生物医药和养殖等均具有重要意义。本研究利用扫描电子显微镜(SEM)系统地观察分析了蚌壳生长的物质输运方式、形核机制和生长模式,并对珍珠层的择优取向进行了针对性的定位X射线衍射(XRD)分析,最终建立了蚌壳的宏观和微观精细结构模型。 相似文献
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SEM在电子元器件破坏性物理分析中的应用 总被引:1,自引:0,他引:1
探讨了在电子元器件破坏性物理分析(DPA)中,如何利用扫描电子显微镜(SEM)的高分辨、景深深、放大倍数高和立体感强等一系列技术特点,对微电子器件的互连金属化层异常缺陷进行定位观察、成像和分析的技术。实践证明.SEM可以很好地解决光学显微镜无法解决的一些技术同题,可以提高DPA结果的准确性。 相似文献
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扫描电子显微镜(SEM)作为一种行之有效的科研分析工具,可对多种植物材料的表面形貌进行观察研究,具有较广的应用范围。本文论述了扫描电子显微镜样品的制备以及在植物花器官、种子表皮、种子形态、叶片表皮、内含物、病原体以及在植物细胞水平的研究进展,并对今后扫描电子显微镜的应用前景进行了展望,以期为利用SEM从事植物研究的科研人员提供一定的研究思路。 相似文献
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本文着重阐述了将系统仿真与虚拟现实技术相结合后,在工程结构分析、岩土工程、防灾工程及模拟施工等结构工程领域中应用的基本思路和发展前景. 相似文献
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本文利用GIS平台的MapInfo软件作为开发平台,设计出了岩土工程勘探的信息管理系统。通过利用GIS系统的图像采集功能,得到不同类型的地质工程的数据资料,并通过系统分析处理,得出不同岩层三维立体分布图面。 相似文献
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The fractal architecture of the systems engineering method 总被引:1,自引:0,他引:1
Hall A.D. III 《IEEE transactions on systems, man and cybernetics. Part C, Applications and reviews》1998,28(4):565-572
It is time to employ fractal geometry and its associated subjects of chaos and nonlinear dynamics to study systems engineering methodology (SEM). Systematic codification of the former is barely 15 years old, while codification of the latter began 45 years ago. This paper asserts that SEM has a fractal architecture. Fractal geometry and chaos theory can convey a new level of understanding to systems engineering and make it more effective 相似文献
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目的:探讨冰冻法构建三维海藻酸钠凝胶作为血管化骨组织工程支架的可行性。方法:采用冰冻法制备三维海藻酸钠凝胶,采用液体替代法测定孔隙率,石蜡切片HE染色和扫描电镜观察孔隙形成情况,图像分析系统检测孔径大小。结果:采用液体替代法测得三维海藻酸钠凝胶孔隙率为91.14%,石蜡切片HE观察显示形态为多孔状,大部分孔隙类似于圆形,镜下可见多个大小不一,分布较为均匀;平均孔径长度为205.26±78.98μm。扫描电镜下,三维海藻酸钠凝胶表面粗糙,高低起伏,孔隙较多,孔与孔之间相互连通,孔径大小不一。结论:冰冻法可以构建具有多孔等特性,能满足组织工程骨及其血管化生长要求的三维海藻酸钠凝胶,使其成为一种较适宜的血管化骨组织工程支架材料。 相似文献
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利用扫描电镜配备微粒分析仪(SEM/MPA)对粉末样品作了形貌观察和粒度统计分布测定,表明SEM/MPA可在陶瓷工艺、冶金工艺等材料工程中实际应用。 相似文献
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We introduce a compact nanomanipulator that can be operated inside the sample chamber of a scanning electron microscope (SEM) for biological sample manipulation. The design of the nanomanipulator is based on that of an atomic force microscope (AFM). A self-sensitive cantilever is used to realize the compact body and thus it is possible to put a pair of the standalone AFM units on the sample stage in the SEM chamber. Using this system, we accomplished nanodissection of biological samples as well as AFM imaging under SEM observation. We then fabricated the surface of a rat renal glomerulus by scan-scratching and succeeded in making a small hole on the wall of a blood capillary. As a result, it was possible to observe the internal structure of the capillary, which had been hidden beneath the surface wall. Furthermore, using two AFM units on the sample stage of the SEM, we successfully dissected the lens fiber cells taken from a rat eye in a multi-probe operation using the two cantilevers. This system is expected to become a very useful tool for micro- and nanometer-scale anatomy and engineering applications. 相似文献
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Poly(acrylonitrile-co-butadiene-co-styrene) (ABS), an engineering plastic, was combined with carbon black (CB) to increase
its conductivity. The ABS/CB composites were prepared using two different methods: dissolution of ABS in Butan-2-one and manual
mixing of the constituent materials. These fabrication methods led to different microstructures, which led to vastly different
electrical properties. The microstructures were acquired using scanning electron microscopy (SEM) and optical microscopy,
while the electrical conductivity was obtained using impedance spectroscopy. The percolation threshold of the composites fabricated
using the manual mixing method was found to be much lower (0.0054 vol.% CB) than that of the composites fabricated using the
dissolution method (2.7 vol.% CB). 相似文献