Results 51 to 60 of about 579,834 (173)
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
wiley +1 more source
由选择腐蚀和选择氧化法相结合研制的GaAs/AlGaAs垂直腔面发射激光器
, 1996 报道了由选择氧化和选择腐蚀法相结合研制的GaAs/AlGaAs垂直腔面发射半导体光器,DBR中的AlAs经选择氧化后形成的氧化层作为有源区的横向电流限制层,器件的最低阈值电流为3.8mA,输出功率大于1mW,发散角小于7.8°,高频测量脉冲上升沿达100ps,并制成了2 ...
张春晖 +7 more
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, 2006 选举作为现代民主政治的重要内涵,与政党发展息息相关。尤其是台湾政党在发展过程中,与选举更有着密切关系。选举既是政党竞争的主要手段,又是政党实力的重要检验。政党既是选举的主要参与者,又受到选举结果的直接影响。两者互为因果,相辅相成。研究台湾选举与政党发展的关系,不论是对认识台湾选举的本质,还是对掌握台湾政党发展规律 ...
董玉洪
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Resource Substitution: Local Governments' Issue Attention and Policy Reinvention
Policy Studies Journal, Volume 54, Issue 4, November 2026.ABSTRACT Research on policy reinvention, where a government modifies rather than replicates policy innovations introduced by other governments, has progressed significantly, but how it is influenced by the government's issue attention has not been thoroughly examined.
Yingxin Zhang, Yixue Yao, Kaifeng Yang
wiley +1 more source
微通道板行波选通分幅相机动态特性的Monte-Carlo模拟
, 2007 近年来，采用微通道板（Micro-Channel Plate，MCP）行波选通实现皮秒分幅摄影的技术取得了很大进展，已广泛应用于激光束打靶的惯性约束核聚变、同步辐射、Z-pinch等离子体等的光学测量，其具有动态空间分辨率高，动态范围大，几何畸变小，时间分辨率高等优点，具有重要的发展前景。 时间分辨率和空间分辨率是微通道板行波选通分幅相机最重要的两个指标，对于X射线皮秒分幅相机，它们受很多参数的影响和制约。已有的理论分析模型都建立在很多假设基础上，对空间分辨率的研究和测试主要集中在静态下 ...
邹峰
core
Coalition Breakdown and Subsystem Exit
Policy Studies Journal, Volume 54, Issue 4, November 2026.ABSTRACT Why actors choose to work together (or not) to advance policy has been the central area of inquiry within the Advocacy Coalition Framework (ACF). Existing research has mainly emphasized the pathway towards coalition formation and evolution, underscoring the stable patterns of allies and opponents observable in policy processes over a decade or
Charlie F. Thompson
wiley +1 more source
Zhejiang Daxue xuebao. Lixue ban, 2007 制备出一种新型弱酸性非抑制电导检测阳离子色谱固定相，并通过对色谱条件的摸索选择，成功实现了常见一价、二价阳离子的分离检测，以及过渡金属离子Ni2+，Mn2+的分离检测.选用甲基磺酸溶液（2 mmol • L-1）和草酸（0.5 mmol• L-1）的混合液作为流动相，一步分离并测得了Li+、Na+、NH4+、K+、Mg2+、Ca2+ 6种阳离子的检测限和线性范围.选用酒石酸（2 mmol• L-1）和草酸（1 mmol • L-1）的混合溶液为流动相，成功分离并测得了过渡金属离子Ni2+，Mn2 ...
GUOYan-ru(郭龑茹) +2 more
doaj +1 more source
Enhanced Corrosion Resistance in an Additively Manufactured Copper Alloy via Suppressed Segregation
Rare Metals, Volume 45, Issue 10, October 2026.ABSTRACT This study elucidates the corrosion behavior of C18150 Cu–Cr–Zr alloy fabricated by laser powder bed fusion (LPBF) in comparison with a conventional wrought baseline representative of industrial Cu–Cr–Zr plate products, highlighting the superior corrosion resistance of the additively manufactured condition.
Yang Qi +4 more
wiley +1 more source
, 2013 本文主要回顾了有关选择超负荷效应的相关研究,选择超负荷效应是指当个体面临过多的选项时,会导致更多的负性结果,从选择超负荷效应的相关概念、作用机制已及影响因素3方面进行了概括和阐述,并对未来的研究进行了展望,希望能进一步明确过多选择的操作性定义 ...
马继伟, 陈毅文
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Dianci bileiqi, 2019 为了解决配电网中性点接地方式具有的人身安全、接地选线及供电可靠性问题,开发了基于故障相智能接地处理方式的配电网多功能安全接地处理装置,该装置采用了铁磁谐振动态预警判断技术、分区式故障相选相技术、故障性质的智能判断与处理技术和自适应接地选线技术解决了配电网铁磁谐振动态预警、判断与处理,解决了过渡电阻接地时的精准选相,解决了故障性质的智能判断与处理,能使瞬时性故障快速恢复,使永久性故障选线精确率提高到百分百,能处理0-2 000 A的故障电流。装置经在电网的试验及运行效果证明 ...
李政洋 +4 more
doaj