Results 91 to 100 of about 672 (144)

Influence of forage grass on hydrodynamic characteristics of slope erosion

, 2005
通过室内模拟降雨试验,研究了不同盖度草地与裸地坡面的产流产沙过程与坡面流水动力学特性。试验结果表明,与裸地坡面相比,草地坡面的含沙量、平均输沙率、径流量以及坡面流速均有不同程度的降低。草地坡面的平均输沙率及坡面流速随草地盖度的增大而减小,而盖度对草地坡面径流量的影响则不明显。裸地坡面的输沙率随降雨历时呈高-低-高变化,而草地坡面的输沙率则随降雨历时呈幂函数递减。试验中坡面径流的弗劳德Fr数和雷诺Re数均属层流的缓流范畴。草地坡面的Darcy weisbach和曼宁阻力系数随草地盖度的增大而增大 ...
上官周平, 潘成忠
core  

[Analysis of setup errors and their correlation with clinical factors in image-guided radiotherapy for prostate cancer using different immobilization devices]. [PDF]

Nan Fang Yi Ke Da Xue Xue Bao
Guo X, Liu Y, Xiong Y, Liu B, Song T, Li Y.   +5 more
europepmc   +1 more source

Discussion on Mechanism of Loess Erosion

, 1997
以黄土高原为例，分析了黄土抗冲性和坡面径流，并根据多年野外调查资料，探讨了黄士侵蚀机理。针对黄土抗冲性极其微弱，黄土高原的年径流深并不大，以及严重的土壤侵蚀由少数几次大暴雨所引起等情况 ...
周佩华
core  

[Application Value of Pancreatic Duct-to-Jejunum Stent-Bridging Internal Drainage in Robotic Central Pancreatectomy]. [PDF]

Sichuan Da Xue Xue Bao Yi Xue Ban
Zhang E, Wu J, Chen M, Ma B, Wu H, Xu Y, Cui H, Zhao Z.   +7 more
europepmc   +1 more source

[Research progress of mucormycosis in burns]. [PDF]

Zhonghua Shao Shang Yu Chuang Mian Xiu Fu Za Zhi, 2023
Shen T, Zhu F.
europepmc   +1 more source

Experimental Study of Sheet Erosion Processes on Loess Hillslope

, 2011
片蚀过程是坡面径流侵蚀过程的第一阶段和侵蚀方式演变的初始形态,阐明坡面片蚀过程可为坡面侵蚀过程模型建立和坡面水土流失治理提供重要科学依据。采用人工模拟降雨试验方法对黄土坡面片蚀过程进行了研究,结果表明:不同雨强及不同坡度下,坡面片蚀率皆随降雨历时的增长呈先急剧增大后趋于稳定的变化趋势,变化的转折点为产流后的5min左右;坡面片蚀模数随雨强和坡度的增大均呈显著的增加,可分别用指数方程和对数方程描述;雨强和坡度对片蚀模数的综合影响可以用二元幂函数方程描述,其中,坡度的影响大于雨强 ...
刘俊娥, 王占礼, 高素娟
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[Bioactive substances delivery for bone repair via nanocomposites: advantages, mechanisms, and emerging trends]. [PDF]

Zhongguo Xiu Fu Chong Jian Wai Ke Za Zhi
Ma Y, Du Z, Wang J, Li X.
europepmc   +1 more source

[Technical standards for the diagnosis and treatment of pediatric total facial management in Shenzhen]. [PDF]

Lin Chuang Er Bi Yan Hou Tou Jing Wai Ke Za Zhi, 2023
Zhang Q, Dai J, Li L.
europepmc   +1 more source

地下供水条件下雨强对土壤养分流失的影响

, 2007
为揭示土壤养分随径流流失的内在机制,采取地下供水方式使土壤入渗强度降低和人工降雨的方法,进行了雨强对土壤养分流失影响的试验研究。结果表明:供试土壤中养分的流失量随降雨强度的增大而增大,而在土壤内部养分迁移量很小;幂函数模型与指数函数模型相比 ...
孔刚, 樊军, 王全九
core  

[Association of public health and social measures with the effectiveness of COVID-19 epidemic control]. [PDF]

Zhong Nan Da Xue Xue Bao Yi Xue Ban
Zong H, Li D, Dai Y, Zhou J, Huang H, Hu G.   +5 more
europepmc   +1 more source