Results 11 to 20 of about 22,578 (158)
Property Taxation in the People\u27s Republic of China [PDF]
, 2014 A property tax is a general tax imposed on all property owners based on the value of their properties. Property taxation is common throughout the world due to its numerous advantages. It is regarded as a steady source of local government revenue.
Asian Development Bank
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Representation of obligate groundwater‐dwelling copepod diversity in European protected areas
Conservation Biology, EarlyView.Abstract Groundwaters sustain diverse surface ecosystems and are populated by metazoan species, mostly invertebrates, that provide fundamental ecological functions and are often of prominent conservation value due to narrow endemism and high phylogenetic rarity.
Francesco Cerasoli +7 more
wiley +1 more source
Design and Implementation of Wireless Communication Network System for a Hospital Based on Triple Play [PDF]
, 2016 随着无线通信技术的持续发展，以及通信业务应用的不断推广，己有多 种无线通信网络投入到实践应用中。而无线通信网络的覆盖重心也从广阔的 室外空间转向了室内，室内覆盖成为了运营商、用户共同关注的焦点。然而 不同于室外环境，室内环境有更多限制，也更为复杂，这使得要解决室内无线覆盖的系统间干扰问题变得十分困难。 本文旨在通过对室内无线综合分布系统的研究，为室内无线通信网络的建设提供一定的参考经验。本文就WCDMA&PHS&WLAN室内无线综合分布系统的可行性进行了研究(本文的3G系统将选择WCDMA作为研究对象)，
张振军
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Conservation Biology, EarlyView.Abstract Human development is a driver of global change and a major threat to biodiversity. Protected areas maintain and support biodiversity, but outside stressors, such as climate change and land use change, can negatively influence natural resources within protected areas.
Leah J. Rudge +2 more
wiley +1 more source
Design and Implementation of Terrestrial Digital TV Frequency Management System [PDF]
, 2015 从20世纪六七十年代开始，我国各级广电部门在国家新闻出版广电总局的指导下，建成了全国范围内的中央、省、市、县级广播电视覆盖网；把党和政府的声音送到了普通百姓家，极大的丰富了广大人民群众的精神生活。2012年，总局提出了地面数字电视广播覆盖网的发展规划，广播电视数字化已成为发展的必然趋势，模拟电视向数字化迈进已摆上重要日程。如何有效利用现有的无线电频率资源，减少各类广播电视台站之间的干扰，进而保障农村广播电视公告服务和地面数字电视业务的健康发展，是模拟向数字过渡期间摆出来的难题。只有通过科学技术的手段 ...
谭红
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Harnessing social media data to track species range shifts
Conservation Biology, EarlyView.Abstract Biodiversity monitoring programs and citizen science data remain heavily biased toward the Global North. Especially in megadiverse countries with limited biodiversity records, incorporating social media data can help address existing data gaps.
Shawan Chowdhury +15 more
wiley +1 more source
Shuitu Baochi Xuebao, 2004 采用旱棚人工控水，蒸发桶整体称重法，对4种地面覆盖材料、50％覆盖度条件下，土壤水分蒸发与移动性能进行了研究。结果表明，在持续干旱时段，覆盖不仅改善了覆盖区土壤水分状况，而且强化了覆盖区与相邻非覆盖区下层土壤液态水的运移与再分布，提高了相邻非覆盖区下层土壤水分状况，有利于减轻持续干旱对造林成活和幼林生长的威胁。通过非线性参数拟合，首次求得了表征塑料地膜、渗水地膜、干草和塑料泡膜4种地面覆盖材料对土壤蒸发的阻抗特征参数，为建立不同覆盖材料在局部覆盖条件下的土壤蒸发量模型奠定了基础 ...
王进鑫 刘广全 王迪海
doaj +2 more sources
Biodiversity‐driven spatial conservation planning to delineate temporally stable regions
Conservation Biology, EarlyView.Abstract The accelerating loss of biodiversity underscores the critical need for effective conservation strategies, particularly in the face of climate change and anthropogenic pressures. We devised a conservation planning framework that adopts a temporal stacking approach to species distribution models and landscape connectivity analyses. These models
Mattia Iannella +5 more
wiley +1 more source
Decoration of Tetrahexahedral Pt Nanocrystals and Studies of Electrocatalytic Processes [PDF]
, 2014 具有明确表面结构的纳米晶催化剂在Pt单晶面模型催化剂(二维宏观尺度)与实际纳米催化剂(三维纳米尺度)之间架起了桥梁以跨越两者存在维度和尺度上的巨大鸿沟。相比于低指数晶面，具有低配位台阶原子的Pt高指数晶面单晶电极对有机小分子电氧化具有更高的催化活性。由{730}晶面围成的具有高台阶原子密度、开放结构的Pt二十四面体纳米晶对甲酸、乙醇表现出较好的催化活性。有机小分子电氧化是结构敏感的反应常会解离生成吸附态的CO(COads)，虽然有机小分子在铂单晶模型电催化剂上得到大量研究 ...
刘海霞
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Shuitu Baochi Xuebao, 2005 试验于2 0 0 2 2 0 0 3年在中科院禹城综合试验站完成,研究了秸秆覆盖和灌溉对冬小麦农田耗水特性的影响,结果表明:秸秆覆盖能够增强灌溉水的入渗能力。随着灌溉量的增加,秸秆覆盖减少深层底墒水(SMBS)的消耗。灌溉显著增加冬小麦的耗水强度,返青后,覆盖处理冬小麦的耗水强度大于不覆盖处理。在播种到返青期间,覆盖比不覆盖处理平均少蒸散5 2 2 5mm。返青后,覆盖处理的阶段耗水量大于不覆盖处理 ...
李全起 陈雨海 于舜章 吴巍 周勋波 董庆裕 余松烈
doaj