Results 61 to 70 of about 731,385 (205)
World Food Policy, Volume 12, Issue 2, November 2026.ABSTRACT This critical ethnographic study examined the perspectives of service providers and organizational leaders working within charitable food services for people experiencing homelessness in two Canadian cities. Informed by Paulo Freire's writings and a human rights‐based approach, we explored how power is enacted through everyday practices and ...
Corinna Easton +4 more
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, 1993 一种薏苡仁酯的提取方法，其特征在于是采用索氏提取器，以丙酮溶剂对原料进行回流抽提。同时在进行层析柱分离处理时采用碱或氨水处理的碱性氧化铝吸附剂层析柱。该工艺与目前采用的技术相比，抽取溶剂丙酮用量少，不用碱洗及用溴麝香草酚蓝指示剂处理氧化铝吸附剂。其工艺过程短，简便易行，分离效果好，产品的收率高可达０．６％，并可较大幅度降低生产成品，因此适于在工业生产中应用 ...
刘和众
core
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
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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
, 2000 为了改变我国海藻多糖依靠水煮及乙醇沉淀法的落后现状，研究开发新的海藻多糖提取分离方法，在海洋863青年基金项目819-Q-15的支持下，本论文以以海带为原料，在浸提方面研究了气升式循环超声破碎浸提工艺及装置；在海藻硫酸酯多糖提取方面进行了絮凝分离和外加电场强化絮凝分离的研究；在分离方面进行了溶剂萃取研究。实验中采用了超声波破碎的方法破碎海带颗粒，从中提取海带多糖。实验所用装置为自制1.2升、8升气升式超声浸提装置。研究结果表明：在1.2升浸提装置中，颗粒的粒度提取率的影响是：随颗粒粒度的增大，提取率下降；
黄猛
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Zhejiang Daxue xuebao. Lixue ban, 2009 研究了紫心甘薯总黄酮的微波提取工艺及其抗氧化活性.以芦丁为标准品,通过选用L9(34)正交表设计实验,确立提取总黄酮的最佳条件并以VC为对照品,采用DPPH •（二苯代苦味酰自由基）法研究提取物的抗氧化活性.紫心甘薯总黄酮的最佳提取条件为：乙醇浓度70%,提取温度80 ℃,料液比1 ：20,提取时间35 min；测得紫心甘薯薯肉和薯皮中总黄酮含量分别为1.55%和3.30%,二者抗氧化活性以半数抑制浓度(IC50)表示分别为0.020 4 ,0.019 2mg •mL-1 ...
GAOLi-wei(高丽威) +1 more
doaj +1 more source
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
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, 1995 本发明属于中药薏苡仁提取物经加工制取的注射液和霜剂新应用领域。其特征是所制成的注射液和霜剂可用于治疗癌症和皮肤顽症。使用它针对癌症和皮肤病的治疗取得了显著的疗效，临床结果表明绝大多数症状在半月至一月内可获痊愈。它具有疗效高，安全无毒副作用等优点。可成为一种抗癌和治疗皮肤病的药物 ...
刘和众
core
Zhongguo youzhi旨在揭示弱酸高盐法提取菜籽蛋白的潜力，以脱脂低温压榨菜籽饼为原料，MgCl2溶液为提取液，采用弱酸高盐法提取菜籽蛋白，采用单因素实验研究提取温度、提取pH、提取时间、提取液浓度及料液比对菜籽蛋白提取率的影响，采用正交实验进行菜籽蛋白的弱酸高盐法提取工艺优化，并比较弱酸高盐法菜籽蛋白与碱提酸沉法菜籽蛋白在抗营养因子（植酸、硫苷和单宁）含量与感官特性（气味、色泽）上的差异。结果表明：弱酸高盐法提取菜籽蛋白的最佳工艺条件为提取温度50 ℃、提取pH 6.5、提取时间150 min、提取液浓度150 mmol ...
方雪莲1,2，冯子盛1，何静仁1,3,4，杨尚华5，张瑞1,3,4 FANG Xuelian1,2, FENG Zisheng1, HE Jingren1,3,4, YANG Shanghua5, ZHANG Rui1,3,4
doaj +1 more source
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
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