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金属空气电池类似于燃料电池,以空气电析为正极,金属电极为负极的高性价比的电池。金属空气电池是一种发电装置,目前正在研发或已处于商品化的金属空气电池有锌空气电池、铝空气电池,锂空气电池等。本文简介了这些电池结构、工作原理、主要特性和应用前景。 相似文献
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空气动力学粒谱分析仪是一种基于飞行时间气溶胶粒子束光谱技术的仪器,能够实时、在线、连续、高速地测量空气动力学粒径谱.它的标定方法正确与否是仪器准确工作的前提,依据动量定理以及空气动力学理论推导了空气动力学粒谱分析仪的标定公式,并用实验数据进行了曲线拟合,对此公式进行了验证,得出了空气动力学喷嘴中气溶胶颗粒物空气动力学粒径倒数的立方与颗粒物速度的关系可以用多项式进行拟合的结论. 相似文献
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计算分析了传统空气处理方式与预处理新风空气处理方式的冷、热耗量,并对预处理新风空气处理方式的适用范围作了计算分析。 相似文献
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一、概况九十年前科学家发现了空气带电现象,经过不断的探索,肯定了带电空气对生物体有着一定的影响。本世纪三十年代,从事物理、生理、临床方面的科研人员相继对空气离子进行了深入的研究,开始了解到负离子对人体的有益作用,发展了空气的人工电离技术,并用于治疗疾病。到七十年代,德、日、苏、美、捷、罗等国 相似文献
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无菌空间控制理念应以微生物学及其控制措施为基础,依据全过程控制,提出了这个全过程应包括进入控制体前控制、进入控制体后控制和退出控制体后的控制。这样才能为无菌环境控制提供更为有效的保障。 相似文献
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We have demonstrated a novel method to fabricate microlenses for organic light emitting diodes (OLEDs) using templates of patterned microbes. Saccharomyces cerevisiae (Baker’s yeast), generally used in a microbiology laboratory, is allowed or restricted to grow in selected areas on a polyvinylidene fluoride (PVDF) membrane, which acts as a substrate. The process comprises of two autonomous approaches, namely, microbial and antimicrobial approaches, which employ inkjet printing for dispensing a suitable ink. The ink is a culture of microbes in the case of microbial approach and an antimicrobial agent in the antimicrobial approach. Once a three dimensional pattern evolves as a consequence of microbial growth, the substrate serves as a template for casting polydimethyl siloxane (PDMS) microlenses. Among the two approaches, antimicrobial approach presents a pattern with low packing density of microlenses. But, microbial approach results into a densely packed array of microlenses with a significant randomness in the distribution of their diameter and height, as required for efficient light out-coupling. The microlenses obtained from both the approaches are attached to the air side of the glass in all three red, green and blue OLEDs. The luminance was measured with and without these microlenses. A maximum enhancement of 1.24X was attained. 相似文献
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Application of preparative electrophoresis in agarose gel for isolation of chromosomal and extrachromosomal genetic elements is described. The above-mentioned method is used for fractionation of chromosomal DNA according to the molecular weight; for isolation of the plasmid containing the insertion of the viral oncogene myc and for separation of the viral oncogene myc insertion from the vector (a linear form of plasmid pBR 322). The method can be successfully applied in molecular biology, microbiology and medicine. 相似文献
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制备常规扫描电镜生物样品时,通常使用磷酸缓冲液来进行漂洗,其结果是容易产生结晶,沉积在样品表面.针对微生物具有坚韧的细胞壁的特性,作者使用去离子水替代磷酸缓冲液来漂洗固定液.结果显示,扫描电镜下样品形态完好,无磷酸盐结晶,提高了样品制备的成功率. 相似文献
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介绍了近期扫描近场光学显微镜(SNOM)在单分子探测、细胞精细结构和微生物学等研究领域中的应用进展,介绍了“量子荧光探针”、“生物纳米光学”的概念,指出了SNOM在细胞内部或膜表面进行单分子探测与单分子量化研究中的难题,并提出将其与超薄切片相结合以解决这些难题的思路。SNOM在各个领域的应用研究还远远不足,需要做更多的工作,其成像原理及图像数据的解析还需作深入研究。 相似文献
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Medium and interface components in impedance microbiology 总被引:1,自引:0,他引:1
Classic impedance microbiology (CIM) is based on the measurement of the impedance components that appear between a pair of electrodes submerged in a cell containing inoculated broth. Either a bipolar or a tetrapolar technique can be applied, requiring about 1 x 10(3) to 3 x 10(7) cells/ml to produce detectable changes in the impedance curves. Theoretical analysis of the electrode-electrolyte interface during bacterial growth is lacking, with no generally accepted measuring standards. Besides, there is considerable disagreement. We separated out the interface and medium components using the frequency variation technique (FVT) and also analyzed the interface reactance-resistance diagram, both before and after bacterial growth. Medium resistance Rm, interface reactance Xi, and interface resistance Ri, were quantified as time functions growth curves, from the complex bipolar impedance seen between two electrodes. We took into account the electrical current density, the temperature and the associated circuitry, also explaining the theoretical and experimental bases that justify the proposed dissecting procedure. It was found that, within the working frequency range, Rm, Ri, and Xi percental growth curves are frequency-independent, i.e., neither Rm(f), nor Xi(f) nor Ri(f) changed their slopes before, during and after bacterial growth. Besides, no alpha-dispersion effect in Rm curves was detected. It is concluded that impedance microbiology could become a fertile area for interdisciplinary knowledge; its development might offer new avenues for basic and applied research. 相似文献
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荧光显微成像具有高分辨率、高灵敏度、高分子特异性以及非介入性的优点,可以在微米乃至纳米尺度下表征样本的形态学与分子功能学信息,成为了生命科学研究的重要工具。随着微观生物学研究的不断深入,荧光显微成像被期待能够动态且立体地观测微观生物结构与分子事件。文中系统性地梳理了近年来快速三维荧光显微成像技术的研究进展,包括点扫描式成像、宽场成像与投影断层成像在提高成像速度、拓展成像维度以及增强成像质量等方面的主要技术手段、改进策略与代表性研究成果,并展望了快速三维荧光显微成像技术的未来挑战与发展前景。 相似文献
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由于现代防空面临的空情极其复杂,反空袭一方如能根据来袭的空中目标情况,将防空雷达对空侦察任务进行合理的区分,会对防空作战产生积极的影响。文中首先分析了对空侦察防空雷达兵力需求问题,然后针对低空目标、干扰目标、隐身目标和ARM载机四类空中目标,给出了防空雷达对空侦察任务区分模型。该模型可为防空作战指挥决策提供科学依据。 相似文献