Results 61 to 70 of about 1,003 (115)
Jianzhu Gangjiegou Jinzhan, 2006 进行了20个型钢混凝土构件的推出试验、20根型钢混凝土偏心受压柱试验,以及23根型钢高强混凝土柱在反复荷载作用下的试验。通过在型钢与混凝土之间埋设的电子滑移传感器和电阻应变片,得到了粘结应力和内部滑移沿型钢埋置长度的分布规律;考虑了混凝土强度、型钢的保护层厚度和埋置长度,以及横向配箍率等诸因素,建立了型钢混凝土粘结强度的计算公式;分析了构件长细比、荷载偏心距对粘结强度和滑移应变的影响,提出了偏心受压柱粘结滑移本构关系的一般表达式;研究了型钢高强混凝土柱在动力作用下粘结滑移的分布规律和粘结退化机理 ...
薛建阳 +4 more
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Shiyou jixie, 2015 针对页岩气“井工厂”的高效开发模式及关键技术，在详细阐述国外“井工厂”钻机技术特点的基础上，介绍了国产钻机在涪陵页岩气示范基地的应用现状，分析了国产钻机在“井工厂”作业中的不足，梳理了国内钻机制造厂商对钻机全方位高效移运技术和钻机自动化升级改造技术的探索研发情况，提出了适合我国今后页岩气开发的“井工厂”钻机一体化解决方案，从而形成适合我国页岩气开发特色的“井工厂”钻机技术。最后指出了页岩气“井工厂”钻机的发展趋势和钻机自动化发展重点。
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[Policy logic and multiple challenges of meal assistance services for older adults under the goal of healthy aging]. [PDF]
Beijing Da Xue Xue Bao Yi Xue BanPan W +7 more
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Gongye shui chuli新能源汽车已成为我国“新质生产力”的代表。对新能源汽车产业的废水水质特征、产业门类工业废水水量指标、处理模式以及重点污染物处理方法等进行了归纳总结。新能源汽车废水污染物成分复杂、有毒性、难以直接生化处理，废水中主要含有表面活化剂、矿物油、磷酸盐、重金属等污染物。通过梳理行业21家重点企业的环境影响评价报告得出，新能源汽车产业废水主要由整车制造、储能装置制造等企业产生。从政策层面上看，当新能源汽车产业形成集聚效应和规模效应时，园区建设配套废水处理厂具有必要性。废水中的重金属离子 ...
李典, 汪洵, 刘应明
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[Price effects of global vaccine pooled procurement]. [PDF]
Beijing Da Xue Xue Bao Yi Xue BanHuang Y, Yu X, Xu M.
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[Case-based teaching with both positive and negative examples in undergraduate analytical chemistry laboratory： determination of six nitrogen-containing pesticides in environmental samples by solid-phase microextraction-high performance liquid chromatography]. [PDF]
Se PuZhang J +4 more
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[Design and implementation of the internet of medical things data platform based on cloud-edge-end architecture]. [PDF]
Sheng Wu Yi Xue Gong Cheng Xue Za ZhiLiang H +10 more
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[Current status and prospects of family financial toxicity in childhood malignancies]. [PDF]
Zhongguo Dang Dai Er Ke Za ZhiWu ST, Wang CL, Shi DR.
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[Ethical risks and regulatory considerations in neurofeedback technology]. [PDF]
Sheng Wu Yi Xue Gong Cheng Xue Za ZhiXue Y +7 more
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