Results 31 to 40 of about 7,997 (115)
Shuitu Baochi Xuebao, 2018 通过室内定床冲刷试验，选用砂布床面模拟土壤下垫面，选用砂布+塑料半球体（直径为40 mm）床面模拟大粗糙单元下垫面，在较大流量（2.81~84.43 L/min）、坡度（2°~10°）范围内，系统研究了大粗糙单元对坡面流水动力学特性的影响。结果表明：（1）大粗糙单元床面的平均流速、平均水深和弗劳德数与流量之间均呈幂函数正相关关系；平均流速和弗劳德数与坡度之间均呈幂函数正相关关系，而平均水深与坡度之间呈幂函数负相关关系；阻力系数随雷诺数的增大而逐渐减小。（2）大粗糙单元增加了坡面流阻力，延缓了坡面流流速 ...
柳晓娜 +6 more
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Using camera traps to enhance community‐based management of subsistence hunting in the Amazon
Conservation Biology, Volume 39, Issue 3, June 2025.Abstract Community‐based management and monitoring of biodiversity has emerged as a cost‐effective strategy for providing credible data, informing decision‐making, and empowering local communities in resource governance and management. However, the establishment of community‐based management of subsistence hunting in the Brazilian Amazon has been ...
Ricardo Sampaio +3 more
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Including the urbanization gradient in people‐centered wildlife conservation in Amazonia
Conservation Biology, Volume 39, Issue 3, June 2025.Abstract Conservation policy in the Amazon traditionally focuses on rural areas, overlooking the socioecological roles of urban populations. This oversight can hinder sustainability by neglecting rural–urban connections. We compared the prevalence and quantity of wild meat consumed, bartered, and traded commercially in rural, peri‐urban, and urban ...
Lísley P. Lemos +3 more
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Shuitu Baochi Xuebao, 2001 利用供沙土槽和试验土槽的双土槽径流小区 ,定量研究了在不同降雨强度下上方来水来沙对陡坡地细沟侵蚀产沙过程和细沟水流水力学参数的影响及其细沟水流水力学特征参数与细沟侵蚀产沙量的关系。结果表明 :坡面细沟侵蚀过程以侵蚀—搬运过程为主 ,坡上方来沙不仅被径流全部搬运 ,且上方来水在坡下方引起了另外的侵蚀产沙量 ,其值随上方来水含沙量的减少和降雨强度的增加而增大。上方来水的汇入或降雨强度的增大可使细沟水流流态由层流转化为紊流。上方来水对细沟水流水力学参数 (流速、水力半径、雷诺数、弗劳德数和阻力系数 ...
肖培青 郑粉莉 等
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Risk, Hazards &Crisis in Public Policy, Volume 16, Issue 1, March 2025.ABSTRACT Disaster insurance is gaining prominence as a tool to address climate‐induced loss and damage in developing countries. Despite ongoing efforts to pilot disaster insurance in Malawi, adoption by households remains low. This study examines factors influencing the adoption of disaster insurance in Malawi, a country highly susceptible to climate ...
Stern Mwakalimi Kita
wiley +1 more source
Ultrasound in Obstetrics &Gynecology, Volume 65, Issue 3, Page 303-310, March 2025.ABSTRACT Objective Globally, one in four pregnant women is classified as overweight or obese, based on their prepregnancy body mass index (BMI). Obese pregnant women are at increased risk of adverse pregnancy outcomes and long‐term cardiovascular disease that occurs earlier in life.
M. Charakida +6 more
wiley +1 more source
Shuitu Baochi Xuebao, 2002 通过不同坡度、不同流量的组合放水冲刷试验 ,对坡面细沟侵蚀发生过程中的坡面流水动力学特性进行了研究。结果表明 ,在试验的坡度和流量范围内 ,坡面流的雷诺数变化于 36 2～ 4 2 84之间 ,并且其变化有随冲刷历时和流量的增大而增大的趋势。而坡面流弗劳德数在整个试验过程中均大于 1,属于急流范围。坡面流阻力系数的大小与水流雷诺数有关 ,但其变化趋势受坡度的影响。在坡度较缓时 ,阻力系数随雷诺数的增大而减小 ;在坡度较大时 ,阻力系数随雷诺数的增大而增大。在径流冲刷侵蚀过程中 ,径流流速并非一恒定值 ...
丁文峰 李占斌 等
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Combating infections under siege: Healthcare challenges amidst the military assault in Gaza
World Medical &Health Policy, Volume 17, Issue 1, Page 188-213, March 2025.Abstract The ongoing Israeli military assault on Gaza has caused a devastating collapse of healthcare infrastructure, resulting in an unprecedented surge in infectious diseases. The destruction of sanitation systems, restrictions on medical supplies, and displacement of civilians have created an environment conducive to the rapid spread of waterborne ...
Bilal Irfan +24 more
wiley +1 more source
Shuitu Baochi Xuebao, 2000 在干旱，半干旱地区，由于气候条件的限制和出于经济方面的考虑，直立植物－砾石覆盖组合措施常被用来防治地表风蚀和风沙危害。为了给这种措施提供设计方面的参考依据，应用直立植物和砾石模型及其不同组合，在风洞测定了不同风力条件下的拖曳力，进而得出阻力系数，以评价其对地表风蚀的防治作用。结果表明，阻力系数取决于地表状况和风速，在各种地表状况下，阻力系数随风速的增大呈指数减小。在分别应用时 ...
董治宝 高尚玉
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Shiyou jixie, 2014 在复杂结构井解卡过程中，为了优化旋转上提和旋转下放的解卡参数，确保载荷能够最大限度地传递至卡点，分析了遇卡钻柱与正常钻柱在摩阻扭矩计算方面的差异，探讨了旋转、减阻器和卡点深度对遇卡钻柱轴向力传递效率的影响。实例计算和分析结果表明，遇卡钻柱的摩阻系数与变形量存在耦合关系，且随载荷分布、卡点深度等参数的变化而变化；钻柱旋转可以提高载荷传递效率，下放解卡时旋转降阻作用更加明显；旋转上提解卡时卡点拉力随井口拉力的增加而增加，旋转下放解卡时最大卡点压力可能不是悬重放空时，通过优化解卡参数可以最大程度地增加解卡载荷；
孙连忠 +3 more
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