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Abstract: The forest-steppe ecotone in northern Hebei and eastern Inner Mongolia is characterized by high biodiversity.
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文摘:河北北部、内蒙古东部森林-草原交错带富于高的生物多样性。 |
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Abstract: The forming mechanism of the cross section of unbroken metal fibers manufactured by the combined cutting of big inclination cutting and chip pulling cutting is analyzed.
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文摘:分析了采用大刃倾角-拉屑复合切削方法制造连续型金属长纤维时纤维横截面的形成机理。 |
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Abstract: The foundation and simulation of aeroengine starter for flight simulator is discussed in this paper.
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文摘:在飞行模拟训练器的研制中，发动机的起动过程是需要重点研究和模拟的过程之一。 |
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Abstract: The four common location methods of active part of omnisealed transformer with corrugated tank are introduced, compared and analysed. Some reasonable location methods are given.
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文摘:介绍了波纹油箱全密封变压器器身的四种常见定位方法，并对其进行了分析比较，从而给出了较为合理的定位方法。 |
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Abstract: The four configurations of RRP simple opened-chain have been analyzed.The accomplished method of kinematics analysis has been gived.It provides the fundament for optimization and accurate analysis of mechanisms.
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文摘:深入分析了RRP单开链的四种装配构形，给出了其统一完整的运动分析方法，为机构选优及运动分析提供了依据。 |
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Abstract: The free radical alkylation of pyridine with fatty acids in the presence of acidic solvent,a series of derivatives of α－monosubstitute prydine were synthesized using ammonium persulfate and silver nitrate as catalyst.
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文摘:吡啶与脂肪酸在酸性环境中用过二硫酸铵和硝酸银催化，发生自由基烷基化反应，得到产物主要是α－单取代吡啶。 |
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Abstract: The friction types and wear mechadism of high-Chromium cast iron composite is discussed.The experimental results show that this compositc pipeline has good economic benefit,applicability and popularization in coal separation medium pipeline.
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文摘:从磨损类型和耐磨机理等方面，对高铬耐磨铸铁复合材料进行了探讨，试验结果和经济效益分析表明，这种高铬耐磨铸铁复合管对于选煤介质管路有良好的适用性和推广应用价值。 |
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Abstract: The function expression for coefficient of pipeline's local head loss was presented through optimizing fitting to coefficient values listed in tables.The fitting accuracy is acceptable.
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文摘:采用优化拟合法通过对图表中有关数值的拟合，给出了管道阀件阻力系数的函数表达式，具有较高的拟合精度。 |
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Abstract: The function, topology, hardware and software methodes of the computer network in pivot of water conservancy was described.The general steps to construct the network was also gived briefly.
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文摘:该文就一个水利枢纽的计算机网络的建设，描述了网络提供的功能、网络拓扑以及所采用的软硬件技术，简要介绍了网络建设的一般步骤方法。 |
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Abstract: The general magnetic fluid grinding methods and magnetic fluids used home and abroad have been reviewed. The current research work and development prospect are also exposed.
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文摘:回顾了国内外常用的磁流研磨方法和采用的研磨流体，简述了磁流研磨领域的国内外研究概况及其发展前景。 |
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Abstract: The general situation and progress of magnetic dipole theoryresearch during recent twenty years in China were introduced briefly including magnetic dipole; linear and strip magnetic dipoles of finite lengths; magnetic force on a magnetic particl
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文摘:简述20年来中国无损检测中磁偶板子理论研究的概况和进展，主要介绍磁偶极子，有限长磁偶极线和极带，磁粉颗粒的受力，磁化场方向对磁粉显现缺陷的影响，棒料、管材和方钢的纵向磁化，工件表面沟槽深度对其引起漏磁场的影响，周向磁化时工件底棱上的杂乱显示成因，圆盘边缘柱面上沟槽内外漏磁场的解析表达式和针状磁介质对两个点磁荷间磁力的影响等。 |
