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| | An easy-to-perform chemical etch method with a good repeatability was studies based on discussions of color metallography and its developments. Color and black and white case mi-crostructures obtained in chemical heat treatment, especially plasma heat treatment were compared on optical microscope. An electron-probe microanalyzer employed to line-scan for element distributions across the total diffusion case in order to verify the results by metallograph-ical analysis. It was shown that the color metallograp... | | 通过对彩色金相技术发展现状的分析.对易获得重现性好的化学蚀刻法进行了探研.结合对化学热处理尤其是在离子轰击热处理渗层分析上的应用.在光学显微镜下进行了彩色与黑白金相对比,借助于电子探针对渗层横戴面作了渗入元素成份线扫描,以便对金相分析结果加以验证.这些工作表明:彩色金相技术对材料工艺研究和提高光学金相实验技术水平都具有一定的现实意义. | | 文摘来源 | | Aim:To establish a new method for controlling automatically the carotid perfusion pressure.Methods: A cheap practical automatic perfusion unit based on AT89C2051 micro controller was designed. The unit,LDB M perfusion pump and the carotid sinus of an animal constituted an automatic perfusion system.Results and Conclusions: This system was able to provide ramp and stepwise up down perfusion pattern and has been used in the research of baroreflex. It can insure the precision and reproducib... | | 目的 :建立一种自动控制颈动脉窦区灌流压的新方法。方法 :采用AT89C2 0 5 1单片计算机构成廉价实用的灌流控制器 ,将它与LDB M型电子蠕动泵、实验动物的颈动脉窦区构成自动灌流系统。结果及结论 :该系统能对大鼠颈动脉窦区进行均匀斜坡升压 ,阶梯升压 降压灌流 ,并己用于压力感受器反射效应研究中。此系统能保证灌流曲线的准确性和可重复性 ,进一步提高了实验的技术水平。 | | 文摘来源 | | The introduction of virtual reality technology into experiment teaching will bring about a revolution in the model of experiment teaching and exert a profound impact in improving the level of experiment technology and the experiment environment. This paper discusses the model of virtual experiment teaching and its application by illustrating virtual reality technology and its role in experiment teaching. | | 虚拟现实技术引入实验教学 ,将引发实验教学模式变革 ,对提高实验技术水平、改善实验环境产生深远的影响。文章通过虚拟现实技术及其在实验教学中的作用阐述了虚拟实验教学的模式及应用。 | | 文摘来源 | |   | | << 更多相关文摘 |
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