Results 111 to 120 of about 742,946 (271)
Beyond Evidence: How Framing Shapes Public Health Policies During Health Crises
Policy Studies Journal, Volume 54, Issue 4, November 2026.ABSTRACT Does the level of evidence that accompanies policy action depend on how a problem is framed, and on who frames it? This article examines these questions in the context of health crises. Bridging sociological and equivalence framing theories, it treats frames as preexisting interpretive schemes shared within communities of actors, whose ...
Antoine Claude Lemor, Eric Montpetit
wiley +1 more source
, 2013 本试验旨在研究核桃青皮的体外抑菌和抗氧化活性，为核桃青皮废弃物的利用探索新的出路。以细菌G+（金黄色葡萄球菌、枯草芽孢杆菌）、G-细菌（大肠杆菌、铜绿假单胞菌）、真菌（白色念珠菌、疫霉菌、青霉菌、绿霉菌）为指示菌，对核桃青皮提取物进行抑菌活性测定。同时，采用福林酚法测定总酚含量、DPPH法测定清除自由基能力、普鲁士蓝法测定还原能力三个方面研究核桃青皮提取物抗氧化活性。主要结果如下： 1. 采用65℃甲醇热回流提取法对核桃青皮进行提取，料液比为1:15，回流提取2 h，连续提取5次，提取率约为20~23%，
张卫星
core
Policy Studies Journal, Volume 54, Issue 4, November 2026.ABSTRACT Public consultations are a cornerstone of democratic policymaking, yet the sheer volume and heterogeneity of submissions often overwhelm traditional analysis. Emerging large language models (LLMs) offer new opportunities for making sense of such data, but their performance in contexts with high linguistic and technical diversity remains ...
Edgar Mathevet, Lauriane Cailleux
wiley +1 more source
, 2010 分析高分辨率遥感影像城市建筑物提取的难点,探讨建筑物阴影与建筑物之间的关系,提出一种阴影辅助的建筑物提取方法:首先在高分辨率影像中提取出建筑物阴影对象,通过建筑物与其阴影的空间关系特征分离相互连接的建筑物对象并确认漏提取的建筑物对象,从而提高了建筑物的提取精度;将该方法运用于Quick Bird影像的建筑物提取实验中 ...
沈占锋 +5 more
core
From Policy Neglect to Research Agenda: Administrative Burdens and Donor‐Conceived Mobilization
Policy Studies Journal, Volume 54, Issue 4, November 2026.ABSTRACT Donor‐conceived adults are a growing population, mobilizing against the very regulatory arrangements that determined the terms into which they were conceived. In Canada and the United States, where donor conception remains persistently under‐regulated, gamete donation policy has historically prioritized the presumed needs of donors, recipient ...
Ashley Splawinski
wiley +1 more source
Fushe yanjiu yu fushe gongyi xuebao本研究以佛手提取液为原料，采用60Co γ射线辐照处理提升其多酚含量，并评估其在保湿、皮肤刺激性、抗氧化、美白及抗炎等方面的护肤功效。结果表明，随着吸收剂量的增加，提取液中的总多酚含量逐步升高，且其对2，2-二苯基-1-三硝基肼基自由基的清除效率与吸收剂量呈正相关。在变色硅胶和46%湿度条件下，佛手提取液表现出较高的保湿率，其保湿性能优于甘油和透明质酸钠。皮肤刺激性测试结果显示，高浓度佛手提取液处理后皮肤呈现白皙光洁状态，且无刺激性，而低浓度下无刺激反应。在0~50 kGy吸收剂量范围内 ...
先 丽 +7 more
doaj +1 more source
, 2014 浮萍（Lemnaceae）生长水体表面，而这些水体大多数为营养丰富的污染水，其微生物丰富，证明它具有抵抗微生物的保护机制，有望成为抗菌物质活性筛选以及动植物病原菌和人类致病微生物感染机制研究的模式体系。本学位论文用不同极性的溶剂对浮萍进行提取，牛津杯法（OxfordCup）及最小抑菌浓度（MIC）结合生长曲线测定等方法，测定比较绿萍zh0018绿萍zh0018（ Lemna minor L.）、少根紫萍zh0024（Landoltia punctata）、多根紫萍zh0003（Spirohela ...
谢天艳
core
Making Policy Evidence Traceable: A Modular Preregistration Framework for Policy Evaluation
Policy Studies Journal, Volume 54, Issue 4, November 2026.ABSTRACT Preregistration is increasingly used in policy research, but its value depends on whether preregistered commitments can be clearly linked to reported analyses. Policy studies often involve multiple outcomes, evolving administrative data, consequential design and analytic choices, and adaptive implementation, making it difficult to distinguish ...
Yiyun Xia, Tianhao Zhao, Yuhao Ba
wiley +1 more source
, 2003 利用天然水华蓝藻为原料 ,通过筛选、比较不同极性提取剂对微囊藻毒素的提取效果 ,80 %甲醇溶液有较高的提取效率 ,而乙醇溶液可实现无毒提取 ,优化了提取方法。并通过调节溶液 p H为藻胆蛋白等电点的方法去除共提取的大量藻胆蛋白 ,取得了很好的净化效果 ...
张维昊,肖邦定,方涛,张锡辉,宋立荣
core
Rare Metals, Volume 45, Issue 10, October 2026.ABSTRACT Lithium‐rich manganese‐based cathodes (LRM) deliver high discharge capacities beyond 250 mAh g−1, but their practical deployment is restricted by irreversible oxygen redox, structural reconstruction, sluggish kinetics and unstable cathode‐electrolyte interfaces (CEI). Here, we develop a colloid‐assisted anchoring‐diffusion engineering strategy
Jia‐Nan Hao +13 more
wiley +1 more source