Results 31 to 40 of about 13,177 (167)
Conservation Biology, EarlyView.Abstract Achieving global conservation policy goals requires the ability to set and measure progress toward science‐based targets for biodiversity. The species threat abatement and restoration (STAR) metric was developed to enable actors to set science‐based targets for species.
Louise Mair +17 more
wiley +1 more source
Zhongshan Daxue xuebao. Yixue kexue ban, 2007 [目的]采用单光子发射计算机断层扫描（SPECT）技术测定抑郁症患者的局部脑血流（rCBF）,与正常对照比较脑血流灌注变化,并观察抑郁症症状与患者脑血流灌注的关系。[方法]以18例未经抗抑郁治疗的抑郁症患者为研究对象,19名正常人作为对照组,分别行SPECT检查。[结果]未经治疗的抑郁患者SPECT脑血流低灌注发生率为72.2%;重症抑郁患者100%存在脑血流低灌注;抑郁组患者双侧额叶、颞叶的rCBF较对照组显著下降（P〈0.01～0.05）,左顶叶、右基底节rCBF也明显降低（P〈0.05 ...
贾艳滨, 黄立安, 徐伊, 徐浩
doaj
International Journal of Applied Linguistics, EarlyView.ABSTRACT Online tutoring platforms (OTPs) are an increasingly popular way for learners to study languages and for teachers to earn money. On many OTPs, individual teachers are responsible for attracting potential students via self‐branding. While scholarship has examined OTP teachers’ self‐branding practices and identified some of the most popular self‐
Wenjing Zeng, Nate Ming Curran
wiley +1 more source
Study of NPZD Ecosystem Dynamical Model Application in Beibu Gulf [PDF]
, 2016 北部湾是我国重要的海湾和渔场，被誉为我国“最后的洁净”，近年来在我国沿海经济发展的成就和潜力倍受关注，然而工业化、城镇化进程的持续加快，也给北部湾的生态环境带来了巨大压力。鉴于此，研究北部湾生态系统的时空分布特征及其对动力环境变化的响应过程具有重要意义，可为我国北部湾生态环境保护建设、资源管理开发和经济发展策略制定等提供科学参考依据。 本文在已建立的“北部湾三维水动力—NPZD生态耦合模型”的基础上进行了进一步的拓展和应用研究，结合历年观测数据、卫星遥感数据和数值模型结果 ...
郑艺妃
core
Scientists in power plays: How substantive were scientists' narratives during the COVID‐19 pandemic?
Policy Studies Journal, EarlyView.Abstract Scientists who provide expert advice must engage with policy processes. Little is known about whether and how scientists deal with the political dynamics of policy processes that are inherent to policymaking. We study this question by building on the policy dimension concept within the Narrative Policy Framework.
Jule Ksinsik, Caroline Schlaufer
wiley +1 more source
Dianci bileiqi湿度影响空气间隙负极性流注放电微观过程，建立棒-板空气间隙负流注放电流体模型以及试验平台。记录放电图像，对比其发展通道宽度及发光强度；测量湿度为40%、50%、60%、70%、80%条件下负极性流注放电电流及，从宏观角度对不同湿度情况下的参量进行对比分析。在数值计算中模拟湿度为0%、30%、60%、90%条件下空气间隙负极性流注放电起始、发展及击穿过程，从微观角度分析水分子对负极性流注放电特性参数的影响规律。研究发现：在棒-板电极结构下，湿度增大促进负极性流注发展。湿度每增大30 ...
王清尘 +5 more
doaj +2 more sources
Dianci bileiqi, 2018 在热力学模型基础上,考虑了空间电荷屏蔽作用的二次电晕起始过程,认为流注茎（电晕区与流注-先导转化区）温度达到1 500 K同时二次电晕起始即新生迎面先导起始。并且根据纹影仪对先导通道根部的观测结果,流注茎假设为类圆锥状。通过Comsol软件对地面高大建筑物尖端处上行正极性先导的始发过程进行了数值模拟研究,并分析了锥形流注茎和二次电晕起始过程对先导始发过程的影响。最终得到了锥形流注茎长度与流注茎半径的关系,证明了随着电流的注入,根部优先转化为先导;计算的建筑物尖端处在最大半径（R=0.24 mm ...
王梦寒
doaj
Zhejiang Daxue xuebao. Lixue ban, 2002 介绍了大庆油田应用胶态分散凝胶深度调剖技术的凝胶成胶机理、影响成胶的因素、凝胶在多孔介质中的渗流特征及现场试验效果.室内岩芯模拟研究及现场典型井试验表明,流动凝胶在多孔介质中可流动,在单井注入15000～20000 m3流动凝胶体系过程中,注入压力逐渐升高,可以实现深度调剖,更好地提高聚合物驱采收率.
XIEChao-yang(谢朝阳) +5 more
doaj +1 more source
Oligomer polariton lasing at room temperature [PDF]
, 2013 科学研究費助成事業(学術研究助成基金助成金)研究成果報告書：挑戦的萌芽研究2011-2012 課題番号：23656009research ...
舛本 泰章
core
Focusing Events, Agenda Setting, and Narrative Numbing
Review of Policy Research, EarlyView.ABSTRACT Focusing events are important in understanding policy change, as demonstrated in Birkland's work on agenda setting, the multiple streams framework, and the narrative policy framework. These frameworks emphasize the role of focusing events in drawing public attention to broader issues.
Megan K. Warnement Wrobel +1 more
wiley +1 more source