Results 21 to 30 of about 93,371 (186)

移动降雨条件下坡面产流产沙过程试验研究

open access: yesShuitu Baochi Xuebao, 2017
通过对降雨移动方向上不同雨强和降雨历时的研究,揭示移动降雨坡面产流产沙关系及其变化规律,采用2个降雨移动方向(沿径流向上和向下移动)、2个雨强(1.35,2.75 mm/min)和2个降雨历时(60,120 min)在室内进行模拟移动降雨试验,分析不同降雨移动方向、不同雨强和降雨历时坡面产流产沙特征。结果表明:(1)向上移动降雨,相同历时(相同雨强)条件下,大雨强(长降雨历时)初始产流时间为140 s(240 s),比小雨强(短降雨历时)提前165 s(65 s)。(2)向下移动降雨,雨强越大 ...
  +5 more
doaj  

A prospective study evaluating the correlation between local weather conditions, pollen counts and pruritus of dogs with atopic dermatitis

open access: yesVeterinary Dermatology, Volume 35, Issue 5, Page 500-507, October 2024.
Abstract Background Canine atopic dermatitis (cAD) is a hereditary, generally pruritic and predominantly T‐cell‐driven inflammatory skin disease, involving an interplay between skin barrier abnormalities, allergen sensitisation and microbial dysbiosis.
L. Widorn   +2 more
wiley   +1 more source

健康中国背景下社区老年人公共体育服务需求与供给研究——以雅安市雨城区为例

open access: yes人文与社会科学学刊
在“健康中国”战略深入实施与人口老龄化加速的双重背景下,提升社区公共体育服务水平对满足老年人健康需求、促进积极老龄化具有重要意义。本研究以四川省雅安市雨城区为典型案例,深入探究该地区社区老年人公共体育服务的需求与供给存在的不足,提出配建体育场地和健身设施、强化体育信息宣传、构建多元协同供给机制、建设专业指导团队等改进措施,可有效提升社区公共体育供给能力,为老年人体育健身提供更多便利,助力健康中国的实现。
杨渊, 黄津容, 唐觅
semanticscholar   +1 more source

不同雨型下紫色土区坡耕地产流产沙特征

open access: yesShuitu Baochi Xuebao, 2017
利用遂宁水土保持试验站5个径流小区1984—2015年次降雨和径流输沙数据,基于降雨过程定量划分出4种雨型,分析了雨型对不同坡度坡耕地产流产沙的作用。结果表明:径流深与各时段最大雨强均呈极显著相关(p<0.01),随着坡度的增加,最大相关系数所对应的雨强时段越短;冲刷量均与I平均呈极显著相关,且相关系数最大。径流深、冲刷量与雨强拟合关系均为幂函数,分别为“凸型”和“凹型”增函数,且拟合度区间分别为[0.79,0.88]和[0.90,0.97],说明冲刷量和雨强的关系更密切 ...
马, 陈, 单志杰, 郎登潇, 廖
doaj  

Demographic and net primary productivity dynamics of primary and secondary tropical forests in Southwest China under a changing climate 气候变化背景下中国西南热带原始林和次生林的群落和净初级生产力动态研究

open access: yesIntegrative Conservation, Volume 3, Issue 3, Page 230-243, September 2024.
Tropical secondary forest at early sucessional stage had higher diamter growth rate and mortality rate, however, these forests also are more risked to droughts and high temperatures. Rising temperatures and more frequent droughts may decrease the carbon sink capacity of tropical forest ecosystems. Abstract Tropical forests are major carbon sinks on the
Sai Tun Tun Oo   +11 more
wiley   +1 more source

喀斯特裸露坡耕地径流养分流失试验研究

open access: yesShuitu Baochi Xuebao, 2016
为揭示雨强对喀斯特坡耕地养分流失的影响,运用可调坡度、地下孔(裂)隙度试验钢槽装填土石模拟喀斯特裸露坡耕地,采用人工模拟降雨的方法研究不同雨强下喀斯特裸坡径流养分流失特征。结果表明:(1)雨强为15,30 mm/h时地表不产流,雨强50 mm/h时地表有产流;试验雨强下地下孔(裂)隙均有径流产生。(2)地表径流中全氮和全钾流失量均随雨强增大而增大,全磷流失量则先增大后减小;地下径流中全氮流失量随雨强增大呈先增大后减小趋势,全钾流失量与雨强正相关,全磷流失量与雨强关系不明显。(3)雨强为30,50 mm ...
靳 丽   +4 more
doaj  

Moving beyond the pathology of policies pushing species toward extinction: The case of spectacled flying foxes in Australia 摆脱将物种推向灭绝的政策症候——以澳大利亚眼镜狐蝠为例

open access: yesIntegrative Conservation, Volume 3, Issue 2, Page 87-103, June 2024.
Some extinctions can be prevented if impediments to protection of threatened species are overcome. Policies and practices have failed endangered species and biodiversity conservation is fraught with impediments such as rhetorical adoption, policy dismantling, circumvention of legislative obligations, and deliberate ignorance of scientific evidence ...
Noel Preece   +2 more
wiley   +1 more source

不同草种配置下植生混凝土边坡的抗冲刷与蓄水性能研究

open access: yes中国科学与技术学报
为提升多雨地区植生混凝土边坡的生态防护效果,系统研究了不同草种配置下的植物生长适应性、坡面抗冲刷性能及蓄水能力。选用狗牙根、黑麦草、高羊茅、四季青四种草本植物,设置无植被、单播、混播三种配置方式,基于自制模拟降雨装置,测试了坡度(30°、45°)和降雨强度(34 mm/h、144 mm/h)下的坡面径流率与侵蚀率,并评价了植生混凝土的蓄水能力。结果表明:(1)四种植物生长速度排序为:黑麦草>狗牙根>四季青>高羊茅,35 d 平均高度分别为16.2cm、14.1cm、12.5cm、10.7cm;“黑麦草 ...
曹粲然   +8 more
semanticscholar   +1 more source

More problems sampling wildlife with baits: Environmental food resources influence trapping rates 使用诱饵进行野生动物采样的若干问题:环境中的食物资源会影响诱捕率

open access: yesWildlife Letters, Volume 2, Issue 2, Page 83-89, June 2024.
In this study, we show that environmental food availability influences wildlife detection probability when using food baits. We sampled small mammals in Borneo with live traps baited with fruit before, during and after the rainforest experienced a mast fruiting event, which drastically altered environmental food availability.
Bastien Dehaudt   +3 more
wiley   +1 more source

水利水电工程高边坡喷锚支护与汛期坡面排水协同施工技术研究

open access: yes水电科技
水利水电工程高边坡因所处区域的地形条件复杂、汛期降雨强度大且集中,容易发生支护体系失稳破坏、坡面冲刷侵蚀等,对工程的施工安全有着直接的影响。喷锚支护能够有效控制岩体变形,汛期坡面排水能够削弱水对边坡的影响,虽然两者的协同作业是保障高边坡稳定的关键环节,但是在具体的施工过程中仍存在一些不足,例如工序衔接不顺畅等、参数匹配不合理等。基于此,文章充分围绕高边坡施工的特性进行深入探究,制定一套科学可行的协同施工技术方案,为水利水电工程高边坡汛期施工安全提供技术支撑。
俊杰 张
semanticscholar   +1 more source

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