Results 141 to 150 of about 1,549,788 (235)
L-脯氨酰胺和手性二胺功能化杂化材料的合成及其在手性Aldol反应中的性能研究
, 2010 有机催化是继酶催化和手性金属络合物催化之后的第三种制备单一手性化合物的有效方法。虽然有机催化在均相方面取得了显著进步，但有机催化剂的固载研究还处于初步阶段，固载有机催化剂的类型，载体的种类等都有待于广泛深入研究。本论文旨在拓展固载有机催化剂的类型，考察多相有机催化剂载体性质对有机催化反应的影响，主要内容如下：在弱酸性的pH＝4.4 的HOAc-NaOAc 缓冲体系下，合成了L-脯氨酰胺功能化的具有二维六方和Foam 结构的介孔材料，在芳香醛与环己酮的直接不对称aldol 反应中 ...
高金索
core
Resource Substitution: Local Governments' Issue Attention and Policy Reinvention
Policy Studies Journal, EarlyView.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
[Numerical simulation study on the influence of free edge configuration on the performance of polymeric heart valves]. [PDF]
Sheng Wu Yi Xue Gong Cheng Xue Za ZhiXiao Y +5 more
europepmc +1 more source
Designing Integrated Policies for the Twin Transition: Challenges and Tradeoffs
Policy Studies Journal, EarlyView.ABSTRACT Democratic governance faces the intertwined imperatives of managing the transformative risks and opportunities of digitalization, particularly stemming from artificial intelligence (AI), while achieving environmental sustainability within planetary boundaries.
Martino Maggetti
wiley +1 more source
Gongye shui chuli纳滤膜是纳滤技术的关键，其性能提升对海水淡化、盐湖提锂及高盐废水处理等领域意义重大。聚酰胺薄膜复合纳滤（TFC）膜的性能不仅受分离层固有特性的影响，多孔支撑层的结构与化学性质也对其分离性能、抗污染性能及长期稳定性具有关键调控作用。系统阐述了支撑层的共混改性（引入有机聚合物、无机纳米材料）和表面改性（涂覆、真空过滤沉淀、原位生长等）方法，分析了改性后支撑层在亲水性、孔隙率及表面形貌等方面的变化，及其对界面聚合反应过程的调控、分离层性能、薄膜复合纳滤膜性能的影响规律。结合近年来支撑层改性纳滤膜聚酰胺层的研究，
钟海媚 +7 more
doaj
[Adhesive property and flexural strength of patterned microstructured zirconia posts fabricated by 3D printing]. [PDF]
Hua Xi Kou Qiang Yi Xue Za ZhiJiang Q, Yin L.
europepmc +1 more source
Leveraging an Unhappiness Lens for Smarter Policies
Policy Studies Journal, EarlyView.ABSTRACT Traditional policy research has largely focused on enhancing happiness or well‐being, privileging positive outcomes as the primary metric of success. We argue that a systematic focus on the drivers of unhappiness—rather than solely on happiness—offers a complementary analytical framework that can uncover hidden societal deficits and broaden ...
Marine Coupaud +2 more
wiley +1 more source
[Fabrication of high-degradation-efficiency molecularly imprinted photocatalysts and its selective degradation performance]. [PDF]
Se PuZhang JJ +4 more
europepmc +1 more source
, 2013 [[abstract]]隨著全球節能減碳的觀念風起雲湧，開發高效率的元件與設備以因應 此一風潮已是不可避免的趨勢。由於奈米科技的發展，在傳統工作流 體中添加奈米粒子形成奈米流體能夠克服傳統毫微米級固╱液懸浮液 於應用時發生沉澱、阻塞與磨損管路等問題，並且能大幅提升熱傳性 能與實用性。此外，將奈米流體應用於鍍膜、塗料、磨潤等領域，藉 由其優異的特性，可對傳統技術提供革命性的發展。然而在奈米材料 安全性的問題方面，仍是一個亟需深思與解決的課題。
鄧敦平
core
Facets of Crises: How Problem Indicators and Public Perceptions Affect Policy Change
Policy Studies Journal, EarlyView.ABSTRACT Crises are widely acknowledged as catalysts for policy change. Yet, our understanding of the policy effects of crises remains limited. Why do only some crises lead to major changes, while significant policy changes also occur during seemingly non‐crisis periods?
Constantin Kaplaner +6 more
wiley +1 more source