Results 41 to 50 of about 326,742 (162)
The need for carbon finance schemes to tackle overexploitation of tropical forest wildlife
Conservation Biology, Volume 39, Issue 1, February 2025.Abstract Defaunation of tropical forests, particularly from unsustainable hunting, has diminished populations of key seed dispersers for many tree species, driving shifts in forest community composition toward small‐fruited or wind‐dispersed trees with low wood density. Such shifts can reduce aboveground biomass, prompting calls for overexploitation to
Caroline E. Milson +3 more
wiley +1 more source
World Medical &Health Policy, Volume 16, Issue 4, Page 774-782, December 2024.Abstract There has been longstanding international fascination with the British National Health Service since it was established in 1948. The British population itself has offered enduring support for the principles and institutions of public provision. However, coverage of the NHS has typically been uneven in academic and policy debates.
Neil Lunt, Mark Exworthy
wiley +1 more source
Gaoya dianqi, 2023 针对目前高压开关柜运行评价大多只是对单一设备进行评价的问题，提出了一种基于多源信息融合，利用设备相似性，使用阈值判断与灰色关联分析的状态评价模型。首先通过带电检测数据、设备信息、设备缺陷三方面，进行多源信息融合并构建开关柜运行状态评价指标体系；然后将三角模糊引入层次分析法，计算指标的权重；考虑到短板效应，引入阈值判断；最后，利用灰色关联分析法，将设备运行环境及状态相近的开关柜进行横向对比及排序，并实现了同时对多台设备的运行趋势分析。通过算例分析，上述方法能更加准确地评估设备的运行状态 ...
黄俊宁, 于群
doaj
Ultrasound in Obstetrics &Gynecology, Volume 63, Issue 2, Page 164-172, February 2024.ABSTRACT Objective Most of the published literature on selective fetal growth restriction (sFGR) has focused on monochorionic twin pregnancies. The aim of this systematic review was to report on the outcome of dichorionic diamniotic (DCDA) twin pregnancies complicated by sFGR.
F. D'Antonio +4 more
wiley +1 more source
, 2009 通过收集2000年以来塔里木河流域的生态、经济和社会状况资料,分析影响该流域生态系统健康的因素,采用指标体系分析法和专家咨询法,确立塔里木河流域生态系统健康评价指标体系和评价标准,计算得出流域生态健康评价指标权重,并对流域生态健康状况进行了评价。结果表明:塔里木河源流的阿克苏河、叶尔羌河和开都河-孔雀河流域的山区生态系统的健康状态处于"中等"级别,和田河流域的山区生态处于"优"级别;阿克苏河、叶尔羌河和和田河流域的平原绿洲区生态处于"优"级别,开都河-孔雀河流域的平原绿洲区生态处于"中等"级别 ...
陈亚宁, 李卫红, 付爱红
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, 2010 2007年7月—2008年5月,对南水北调中线水源区丹江口水库若干入库溪流的河流水文、河流形态、河岸带、水体理化和底栖生物进行调查并应用河流健康综合评价指数进行评价。结果表明,位于上游的溪流生态系统健康状况较好,而位于城镇下游的溪流生态系统健康状况较差,主要体现在河流形态的改变、底栖藻类自养指数升高和底栖动物多样性减小。提出维持丹江口入库溪流生态系统健康的建议,除了对上游地区要进行生态环境保护外 ...
李凤清 +3 more
core +1 more source
Prenatal diagnosis and postnatal outcome of Type‐III vasa previa: systematic review of literature
Ultrasound in Obstetrics &Gynecology, Volume 63, Issue 1, Page 24-33, January 2024.ABSTRACT Objective Type‐III vasa previa (VP) is a rare form of VP, not necessarily associated with other placental or vascular anomalies, in which aberrant vessels run from the placenta to the amniotic membranes, near the internal cervical os, before returning to the placenta. Early diagnosis of Type‐III VP is important but technically challenging. The
M. Pozzoni +7 more
wiley +1 more source
, 2010 生态系统服务是指自然生态系统及其物种所提供的能够满足和维持人类生活需要的条件和过程,是生态系统对人类生存和生活质量有贡献的产品和服务,也可称为是生态系统与生态过程中所形成的、能够维持人类生存的自然环境条件及其效用。本文论述了生态系统服务价值的划分 ...
黄湘.
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Gaoya dianqi, 2017 作为配电网主设备之一,开关柜的状态直接影响着电网的整体运行效果以及用户的用电质量,针对当前开关柜状态评价的信息完备性低、动态性差等问题,提出了一种基于多源信息融合的配电真空开关柜状态评价模型。文中选取开关柜的超声波值、暂态地电波（TEV）值、红外测温值、真空度、绝缘电阻、机械性能参数等信息,将真空开关柜分成断路器、母线、出线电缆3部分进行状态评价,并融合开关柜整体所处的环境信息、运行信息以及开关柜在电网中的位置信息,采用隶属度函数和比例模型,建立开关柜状态评价模型,并将模型应用于过去5年内的20个时段 ...
亢超群 +5 more
doaj
, 2009 阐述了人工湿地生态系统服务的定义、分类、项目及其评价方法。介绍了生态系统服务价值评价在国内外的研究现状,指出了当前研究工作的局限性,对将来的发展方向作出了研究展望。论述了人工湿地所具有的服务功能 ...
贺锋, 董金凯, 吴振斌
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