Results 91 to 100 of about 1,894 (167)
Gaoya dianqi针对海陆缆过渡接头处护套接地电流存在三相不平衡的问题，以某220 kV海陆缆混合线路为例，研究过渡接头处护套接地电流三相不平衡的原因。通过理论分析、仿真计算和试验验证发现回流缆的布置及接地方式是导致护套接地电流三相不平衡的主要原因。根据研究结果，提出回流缆布置及接地方式的改造方案，有效解决过渡接头处护套接地电流三相不平衡的问题，保障海陆缆安全稳定运行。
丛贇 +6 more
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Exploration of the impacts of cement sheath on casing stress based on the arching effects of formations [PDF]
ObjectiveWith the growth in the demand for natural oil and gas and the technological progress of their production, the oil and gas well depths have been constantly setting new records.
Fengchen AN +6 more
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Dianci bileiqi, 1985 用固体涂层法和盐雾法对硅橡胶护套、氟塑料护套、瓷护套合成绝缘子和标准型瓷绝缘子做人工污秽对比试验。两种试验结果相仿,但有差别。在盐雾试验中,更能显出合成绝缘子表面憎水性的作用。在实验室中,合成绝缘子有优异的耐污性能。但需要进行长期运行试验,来考验表面性能的耐久性。
张仁豫, 薛家麒, 朱德恒
doaj
Changes in intestinal flora of coal workers' pneumoconiosis patients after tetrandrine intervention [PDF]
BackgroundPneumoconiosis is a widespread occupational disease in China at present. As a type of lung diseases, its pathological damage is mainly irreversible fibrotic changes in the lungs. Several studies have shown that the occurrence and development of
Baoping LI +9 more
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Dianci bileiqi, 1997 对护套复合绝缘子和伞套复合绝缘子的组装工艺从工作效率、材料消耗、使用模具以及废品率等方面进行了比较分析，指出护套复合绝缘子的组装工艺大幅度降低了生产成本，显著提高了综合经济效益。
张福林
doaj
Dianci bileiqi, 2021 交流三芯海底电缆是传输海上风电的重要载体。敷设后的海缆被海水浸没,海水浸入铠装直至金属护套,造成海缆沿线金属护套处接地。海水浸入作用影响电缆过电压计算模型中护套及铠装的接地方式,影响海缆线路工频过电压计算结果。笔者基于双回路交流三芯海缆线路进行建模计算,模型中提出一种将海缆分段,每段海缆护套和铠装通过电阻接地的方式模拟海水的浸入作用。首先从不同位置发生故障后零序网络的区别分析海缆与陆缆模型的差异。其次在海水浸入模型的基础上 ...
汪惟源, 程锦闽
doaj
The Transformation of Creative Ways from Self-focus to Reality Intervention [PDF]
, 2007 全文根据自己思维与作品的发展历程来论述个人对于艺术关注的转变——从希望仅仅通过对自身的反思来达到与最广泛现实的联系转变到直接介入现实来创作，试图以小窥大反映某种发展的路径。文章先是就作者本人的一次牙痛就医的亲身体验对过去一直存于心中思考的关于贯穿自己作品的创作红线—即理念的问题,获得了某种可能的理解:我的创作既是对两次“疼痛”联系记忆的并置。接着在对自己过去作品的分析过程中我发现这种创作方法存有大量的疑问,比如:如何让作品自己说话?如何避免过度的诠释和难以传达对作品带来的影响 ...
杨健
core
Analysis of quality of life of rectal cancer patients after transanal total mesorectal excision and laparoscopic total mesorectal excision: a retrospective cohort study [PDF]
Background and purpose: There are few studies on the quality of life after transanal total mesorectal excision (TaTME) for rectal cancer, and there is a lack of evidence-based research.
CHEN Jiayu, LI Yue, CHEN Fan, LI Yuxue, FENG Shidong, HUANG Qi, LI Dawei, LIAO Zhiwei
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Gaoya dianqi, 2009 根据单芯XLPE电力电缆金属护套环流计算模型,编写C++程序,计算了交叉互联单元内三段电缆布置方式和段长不一致时的金属护套环流,并将计算结果与现场测试结果进行比较分析。根据计算和现场测试结果,一个交叉互联单元内三段电缆的段长和布置方式不一致对金属护套环流有影响,当电缆采用直角三角形和水平布置方式时影响尤为严重。为减小金属护套环流,高压单芯电缆应尽可能采用正三角形布置方式且保证三段电缆布置方式一致,段长尽量相等。
王波 +4 more
doaj
The control of fragmenting swelling deformation disasters in deep mine roadways and the efficient TBM tunneling technology under such conditions [PDF]
As shallow coal resources are gradually exhausted, the exploitation of deep coal resources goes deeper, where all mines in eastern China and some mines in central-western China have entered the deep mining stage.
Bin LIU +16 more
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