共查询到3条相似文献,搜索用时 15 毫秒
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AutoCAD作为一种通用设计软件,它提供了多种二次开发环境,以弥补它在自动绘图方面的不足.同时以GB5780-2000系列六角头螺栓为例,详细说明了如何采用内嵌于AutoCAD的二次开发环境Visual LISP来实现二三维标准件图形的参数化设计,从而为用户提供简便且界面友好的标准件零件自动绘制交互式环境. 相似文献
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Schmidt F Kühbacher M Gross U Kyriakopoulos A Schubert H Zehbe R 《Ultramicroscopy》2011,111(4):259-266
3D imaging at a subcellular resolution is a powerful tool in the life sciences to investigate cells and their interactions with native tissues or artificial objects. While a tomographic experimental setup achieving a sufficient structural resolution can be established with either X-rays or electrons, the use of electrons is usually limited to very thin samples in transmission electron microscopy due to the poor penetration depths of electrons. The combination of a serial sectioning approach and scanning electron microscopy in state of the art dual beam experimental setups therefore offers a means to image highly resolved spatial details using a focused ion beam for slicing and an electron beam for imaging. The advantage of this technique over X-ray μCT or X-ray microscopy attributes to the fact that absorption is not a limiting factor in imaging and therefore even strong absorbing structures can be spatially reconstructed with a much higher possible resolution. This approach was used in this study to elucidate the effect of an electric potential on the morphology of cells from a hippocampal cell line (HT22) deposited on gold microelectrodes. While cells cultivated on two different controls (gold and polymer substrates) did show the expected stretched morphology, cells on both the anode and the cathode differed significantly. Cells deposited on the anode part of the electrode exhibited the most extreme deviation, being almost spherical and showed signs of chromatin condensation possibly indicating cell death. Furthermore, EDX was used as supplemental methodology for combined chemical and structural analyses. 相似文献