Results 111 to 120 of about 60,617 (172)
Shuitu Baochi Xuebao, 2016 运用分形模型，结合野外调查和室内试验分析汉中市荒草地整治后耕作层土壤颗粒分形特征，探讨土壤颗粒分形维数与土壤质地、粒径组成以及养分含量的关系，建立整治后耕作层土壤分形维数预测函数。结果表明：（1）整治后土壤颗粒分形维数D介于2.55～2.95之间，均值为2.77，标准差为0.134，土壤颗粒分形维数与土壤质地有一定的关系，表现为土壤质地越细，分形维数越大。（2）土壤颗粒分形维数主要是由黏粒含量决定，分形维数与黏粒含量呈显著线正相关（R2=0.978 0）；利用分形维数与土壤黏粒（≤0.002 mm ...
雷, 韩霁昌
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Gaoya dianqi, 2016 为有效分析变电站接地网的冲击特性,提高变电站电气设备的运行可靠性和确保人身安全,文中以35 kV变电站用典型接地网为依托,基于量纲相似原理设计和定制了规则形状和不规则形状的两种接地网模型,通过模拟接地网导体变细、断裂和脱焊等典型故障,对接地网模型的冲击特性进行了试验研究。试验结果表明:接地网的冲击特性随冲击电流波形、注入点不同有较大差异,且规则接地网的暂态散流特性优于不规则接地网;对同一冲击电流注入点,冲击电流波形的波头时间越短,接地网的冲击接地电阻越大;冲击电流从接地网中心注入时 ...
苏磊 +4 more
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Dianci bileiqi, 2012 输电线路防雷实践需要全面准确地积累各种雷电参数及对输电线路线径周围地形地貌做出准确地判断,传统方法对雷电参数的积累不够全面和精确,而对输电线路周围地形地貌的判别往往需要耗费大量的人力物力。针对上述问题,简要介绍了Global Mapper软件的基本功能,重点阐述了该软件在输电线路雷电参数的优化统计和对雷击跳闸线路周围地形判别方面的应用。通过该软件,可以实现三维雷击地闪点定位,在三维地理空间更为全面地收集雷电参数;优化雷电地闪密度参数的计算方法,使雷电参数的统计更为精确;生成输电线路路径断面图 ...
申元, 王磊, 马御棠, 黄然
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[Reconstruction of superficial organs: a leap from structural restoration to functional rehabilitation]. [PDF]
Zhonghua Shao Shang Yu Chuang Mian Xiu Fu Za ZhiZan T, Gao YS.
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[Repair and reconstruction of facial organ injuries: a perfect fit of structure and function]. [PDF]
Zhonghua Shao Shang Yu Chuang Mian Xiu Fu Za ZhiSong BQ, Pei JM.
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[Pretreatment of tear film video in corneal topography]. [PDF]
Sheng Wu Yi Xue Gong Cheng Xue Za Zhi, 2019 Chen Y, Liu M, Yan H, Fang Z.
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[Limb reconstruction over four decades: the seamless path from technical integration to disciplinary ecology]. [PDF]
Zhongguo Xiu Fu Chong Jian Wai Ke Za ZhiZhu Y.
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[The practice of building a wound repair discipline system with Chinese characteristics in countryside area: insights from the "Three Souths" experience]. [PDF]
Zhonghua Shao Shang Yu Chuang Mian Xiu Fu Za ZhiFu XB.
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[Archeological Research on Third Molar Degeneration]. [PDF]
Sichuan Da Xue Xue Bao Yi Xue BanHuang H, Zhou J, Zhou X.
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[Multiple myeloma with massive proliferation of signet ring cell like plasma cells: a case report]. [PDF]
Zhonghua Xue Ye Xue Za ZhiBai ZY +6 more
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