共查询到14条相似文献,搜索用时 62 毫秒
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随着扫描电镜的发展及分辨率的不断提高,要求标本制作的技术也越来越高,目前,很多珍贵的标本由于制作不当而得不到较好的结果,细微结构反应不出来或存在人为假象,有的标本观察后照片水平低不能发表,针对特殊标本(模式标本)看完后可以还原等,诸如此类的问题,对昆虫标本的制作我们进行了多年的探究,并找到一些有效的解决办法供参考。 相似文献
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扫描电镜2000N在位拉伸台及其应用 总被引:1,自引:0,他引:1
扫描电镜在位拉伸台是一种动态观察和分析材料微观变形形貌及断裂机制的手段 ,在材料科学前沿研究中发挥了重要作用。本室的在位拉伸台是利用 1987年引进的日本日立公司的S 5 70扫描电镜2 0 0N在位拉伸台委托北京力学所升级改造而成。经升级后最大载荷提高到 2 0 0 0N ,且加载、数据采集、曲线绘制全部实现微机控制。通过该系统可以对固体材料受力时的微区变形 ,损伤及破坏演化过程 ,进行跟踪观察、记录、同时绘制载荷、应变曲线。为定量描述材料的力学行为、研究材料的变形、裂纹扩展过程和界面破坏规律提供了一种非常有用的试验设备。1… 相似文献
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扫描电镜自动样品台控制系统 总被引:2,自引:0,他引:2
本文主要从自动样品台控制系统的功能分析、设计朱理以及运作过程的角度阐述其开发设计的基本思想与所采用方案,并通过对其性能、结构特点等的介绍表明系统具有相对独立性和扩展性,可对不同的电镜样品台进行改造,具有广泛的应用前景。 相似文献
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The ptilinum of the fly and the compound eye are among the most fragile organs encountered during conventional procedures of morphological sample fixation. In order to identify a fixative suitable for preparing such samples for scanning electron microscopy, we examined various fixation conditions using microwave irradiation (MWI). The conditions examined were: (i) fixatives; (ii) temperature; (iii) concentration; (iv) duration; (v) dehydration; and (vi) substitution. The identified optimal conditions were 5% glutaraldehyde with MWI (350 W, 5 min). The MWI was continued until the maximal temperature of 75 degrees C was attained, followed by intermittent irradiation to maintain a temperature of 75 degrees C. After irradiation, the sample was left at room temperature for 24 h in the fixative and then dehydrated in increasing concentrations of ethanol. Each step in the ethanol series lasted for 24 h. The final absolute ethanol step included three solution changes, with each incubation lasting 1 h. A subsequent stepwise substitution of t-butyl alcohol for ethanol was conducted by reducing the ratio of 100% ethanol to t-butyl alcohol from 2:1 to 1:1 and then 1:2 (24 h each). The substitution was completed by three solution changes using 100% t-butyl alcohol, 30 min each. The best results were obtained by freeze-drying samples using t-butyl alcohol. The use of MWI improved fixative permeation, which occurred at a uniform rate throughout the sample. Comparison with temperature in a water bath at 75 degrees C indicated that the fixation effect of MWI was due to its heat generation in addition to some unknown mechanism. 相似文献
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利用扫描电镜冷台对植物样品观察初探 总被引:1,自引:0,他引:1
利用扫描电镜冷台对随机采集的植物的花、叶、茎、花粉粒等干湿状样品进行了观察比较,这些样品用双面胶粘结在样品台上,不经过任何处理直接放置在冷台的固定器进行观察。结果发现新鲜植物样品和干燥后的植物样品表面特征差异显著,采样SEM冷台观察的植物样品表面可以保持其良好的外观形态和超微结构特征。 相似文献