Results 71 to 80 of about 1,894 (167)
Dianci bileiqi, 2019 通过鸟粪影响情况下,绝缘护套在220 kV线路上不同缠绕方式的耐受性试验和缠绕绝缘护套后临界危险区域划分试验,证明了绝缘护套在220 kV线路上能有效防止鸟粪通道跟均压环之间的放电,降低了鸟粪闪络的概率。由此提出,绝缘护套作为一种新型防鸟粪闪络装置,用于改善鸟粪闪络事故是比较有效可行的。
王超 +7 more
doaj
Design of a mine-used bus type optical substation [PDF]
The coal mine safety monitoring system plays a very important role in coal mine safety production. It mainly collects sensor disaster information such as methane and carbon monoxide through monitoring substations and analyzes it in real time to achieve ...
Fei DENG
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A prospective single-arm study on surgical treatment of pulmonary nodules located beneath the interlobar pleura and adjacent to the pulmonary hilum [PDF]
Background and purpose: Accurately locating pulmonary nodules is the key to the success of thoracoscopic surgery. This study aimed to investigate the strategy and evaluate the feasibility, safety, and clinical value of thoracoscopic surgical treatment ...
WU Wenli, SONG Qingping, GENG Dongxiao, ZHAO Yanfeng, CHEN Haiquan, YU Qiufeng, JIANG Feng
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, 2003 为了继续保持我国男子竞技体操世界领先的优势,运用文献法、调查访问法和逻辑推理法对近四次男子竞技体操规则变化进行总结性研究。旨在透视规则,前瞻发展方向。研究结果得出近四次来规则变化的一些特点和规律 ...
左成, 陈礼贤
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Characterization and structure analyses of the chelate products of chelate–assist phytoextraction in Pb contaminated soils [PDF]
, 2017 我国是全球铅储量最大的六个国家之一，在蓄电池、电缆护套、铅合金、射线防护，铅基催化剂等行业中，铅都发挥着重要作用，但同时铅也是严重危害生物健康的重金属之一。环境中的铅大部分都在土壤之中，因此如何治理土壤中的铅污染成为一个人们广泛关注的问题。目前最具应用潜力的方法是用螯合剂与铅结合形成配合物以提高铅的溶解度使之能够被植物吸收，达到治理铅污染的目的。本文以氨基多羧酸类螯合剂：乙二胺四乙酸和1，3-丙二胺四乙酸；以及天然小分子有机酸类螯合剂：柠檬酸为配体，系统地研究了它们在不同条件下与铅的螯合产物 ...
戴俊伟
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Design and analysis of a new type of fresh peach slitting machine [PDF]
[Objective] To deal the technical difficulties in further realizing the automation of de nucleating production of fresh peach slices. [Methods] A new type of fresh peach slicing and coining machine was designed.
ZHANG Yifei
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Gaoya dianqi国内交联聚乙烯（XLPE）高压电缆一般采用皱纹铝护套结构，然而现有电缆电气特性的参数计算多基于平滑护套结构，未考虑皱纹护套带来的影响。文中从电场分布入手，基于有限元法分析了皱纹护套结构下的电场分布及缓冲层泄漏电流，进而针对护套感应电压、电缆工频电容和电感进行分析，对比平滑护套结构和皱纹护套结构对以上两组电气参数的影响。同时运用公式法对平滑护套电缆进行计算，作为有限元分析结果的对照。结果表明，皱纹结构会造成气隙电场集中，泄漏电流增大，皱纹铝护套结构会降低护套感应电压约10%，增大工频电感约4 ...
李岩, 刘一帆, 高颂, 施碧君
doaj
中西医结合护理Protective restraint is an important nursing measure to ensure patient safety, and restraint gloves are commonly used protective restraint tools. This paper introduces a special restraint glove with the function of detecting blood oxygen saturation. This
LUO Jie (罗杰) +5 more
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Purification and Characterization of EGase from Glyptotermes Xiamenensis Li et Huang [PDF]
, 2008 以厦门树白蚁（GlyptotermesXiamenensisLietHuang）为材料，经PBS缓冲液（pH6.7）匀浆抽提处理、硫酸铵分级分离获得白蚁纤维素酶（Endo-1,4-β-D-Glucanase，EC3.2.1.4，简称EGase）粗酶。进一步经DEAE-SepharoseFastFlow阴离子交换柱层析、ShephadexG-100凝胶过滤柱层析等纯化，得到比活力为458.7U/mg的电泳单一纯的酶制剂，测定该酶的分子量约为44.8kD，等电点(pI)为6.1，酶的紫外吸收峰在278nm ...
安刚
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The Influence of cAMP on Demyelination of Nerve Fiber after Spinal Cord Injury [PDF]
, 2012 目的：研究脊髓损伤后，在损伤局部持续应用环磷酸腺苷（cAMP）对继发性神经纤维脱髓鞘改变的影响，分析神经纤维脱髓鞘的程度及血清中髓鞘碱性蛋白含量的变化趋势及相互关系，探讨神经纤维脱髓鞘程度与脊髓功能的关系。从而为治疗脊髓损伤提供一个新的思路，并为临床应用环磷酸腺苷（cAMP）提供理论依据。 方法：选取雌性SD大鼠150只，随机分为A、B、C、D组，其中A组及B组各25只，C组及D组每组各50只。各组均行胸12椎体后路椎板切除开窗术，A组不打击脊髓，B组，C组及D组术后应用改良的Allen′s法打击脊髓 ...
李大坤
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