Results 21 to 30 of about 686,199 (178)
, 2002 本发明公开了一种电解质脉冲法测量水流流速和泥沙含量的方法，以溶质运移理论、波动学、传导学为基础，结合现代数学建立并求解电解质脉冲在含沙径流中的运移模型，分析模型中水流速度和泥沙含量的特征量，并以理论依据的计算和数据存贮，制作通过水流和泥沙含量测试的计算机软件，本发明能很好地同时测量水流流速和泥沙含量，测量精度非常高，速度较快，并且简单易用。本发明可应用于各种导电性能不太好液体的流速和其中悬浮质的含量测量，测量速度范围为大于零、小于50m/s。泥沙含量测量范围为0－100％，因此也可以测量土壤 ...
王辉, 雷廷武, 赵军, 夏卫生
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Behavioral interventions to reduce demand for threatened freshwater turtles as pets
Conservation Biology, EarlyView.Abstract Growing demand for freshwater turtles as pets has fueled illegal trade and accelerated wild population declines, underscoring the need for theory‐based demand‐reduction interventions. We conducted a three‐part randomized controlled trial with active turtle keepers (n = 1800) in China to test conservation‐ and legality‐framed messages by ...
Wuji Zheng +9 more
wiley +1 more source
, 2005 通过对巴音布鲁克草原近20年牧草产量与同期降水和温度资料进行对比分析,探讨了降水、温度等气象因子对高寒草地牧草产量的影响。结果显示:降水、气温与牧草产量的相关性均较好,只有在降水和温度均适宜的条件下,牧草产量才会增加,说明降水和温度共同影响了牧草产量,是影响高寒草地产量的2 个主要限制性因子;在巴音布鲁克,由于不同草地类型间的自然条件存在较大差异 ...
徐海量,宋郁东,胡玉昆
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Conservation Biology, EarlyView.Abstract Site fidelity is the tendency for animals to repeatedly return to the same locations, either within or between years. Site fidelity enables animals to utilize knowledge of previously visited locations, including assessments of seasonal variations in health and mortality risks (e.g., predation), resource availability, and social benefits such ...
Tobias A. Ross +13 more
wiley +1 more source
, 2009 基于黄土高原及周边地区74个气象站1952-2001年降水量数据,计算各站年降水量线性趋势系数,利用ArcGIS地统计模块普通Kriging插值法生成黄土高原地区1952-2001年年降水量和年降水量线性趋势表面,分析年降水量、年降水量线性趋势表面时空分布特征与10年尺度降水量带动态变化。结果表明,黄土高原地区1952-2001年平均年降水量(426.69±67.85)mm,年降水量和年降水量线性趋势存在显著时空分异;年降水量由西向东线性增加,从南到北二次曲线递减,总体上东南西北方向递减 ...
高照良 +3 more
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Genomics‐informed management of ex situ populations
Conservation Biology, EarlyView.Abstract The European Association of Zoos and Aquariums (EAZA) manages insurance populations for hundreds of species through its EAZA ex situ programs (EEPs). EEPs help safeguard against extinction in the wild and provide source populations for genetic rescue programs.
Cock van Oosterhout +8 more
wiley +1 more source
, 2015 降水是全球能量和水循环的重要组成部分之一，在不同时空尺度的大气循环中扮演着不可或缺的角色，不同地区降水对全球气候变化的响应是十分明显的，所以正确描述区域降水对人类的生产生活有着极其重要的意义。地面气象站点观测可以精确测量一个地区的降水量，然而，受到经济、地形、海拔、交通等诸多因素的限制，气象站往往架设在平原地区，且密度不大，尤其在山区和沙漠等地形复杂地区布设的站点稀少，且存在着时间和空间不连续等缺陷，所以如何正确描述全球和区域降水特征成为一个难题 ...
沈彬
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Glycerophosphocholine‐Mediated Dual Regulation for Highly Stable Aqueous Iron‐Ion Batteries
Rare Metals, Volume 45, Issue 8, August 2026.ABSTRACT Iron‐ion batteries (FeIB) offer the advantages of low cost and high capacity, demonstrating potential for large‐scale energy storage. However, severe hydrogen evolution reaction (HER) occurs during cycling, which significantly impacts battery lifespan.
Tian Yang +6 more
wiley +1 more source
, 2010 水庫供水的主要來源為本身儲存的水量及入流量，但入流量具有不確定性，因此在不預期的乾旱時期水庫供水量有時無法滿足既定的需求量。良好的水庫營運規則可使缺水的影響減到最低，如何將水庫入流量的不確定性併入水庫的供水規則為本文的研究重點。對於水庫入流量，本文考慮歷史紀錄流量中最小入流量與入流量條件平均值（定義為已知前月入流量時本月入流量之平均值），並以其對需水量的關係作為水庫的供水指標。水庫的營運結果則以缺水特性，包括缺水延時、缺水量及缺水頻率等相關缺水指標來評估。文末則以簡化的石門水庫單目標供水系統為例 ...
蕭政宗; 李皓志
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Rare Metals, Volume 45, Issue 8, August 2026.ABSTRACT Infected bone defects represent a dual therapeutic challenge demanding concurrent infection inhibition and osteogenesis promotion. Systemic antibiotic administration is taken as a classical treatment protocol but often yields inadequate local antibiotic concentrations and delayed bone repair.
Xucai Wang +8 more
wiley +1 more source