Results 31 to 40 of about 14,704,059 (159)
Rare Metals, Volume 45, Issue 5, May 2026.ABSTRACT Multicomponent transition metal oxides (TMOs) incorporating rare‐earth (RE) elements have emerged as promising materials for the oxygen evolution reaction (OER). However, knowledge of how to regulate the structure of TMO‐based nanomaterials through RE incorporation to enhance catalytic performance remains limited.
Bolin Zhao +6 more
wiley +1 more source
, 2004 一种丙烯二聚制备六碳烯烃的催化体系及应用，催化体系由Ni(η5-Ind)2配合物/有机铝化合物，或镍配合物/有机铝化合物/有机膦组成。该体系在有机溶剂或液相丙烯中催化丙烯二聚反应。利用Ni(η5-Ind)2/有机铝化合物体系催化丙烯二聚反应，催化活性可达50000mol C3＝/(molNi·h)，二聚选择性为70～90％，二聚产物中甲基戊烯(MP)的含量为80％；用Ni(η5-Ind)2/有机铝化合物/有机膦体系催化丙烯二聚反应，催化活性高达170000mol C3＝/(mol Ni·h ...
陆世维, 吴思忠
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Rare Metals, Volume 45, Issue 4, April 2026.ABSTRACT To address the issues of aluminum (Al) powder agglomeration during combustion and low oxidizer decomposition efficiency in composite solid propellants, this study utilized in situ self‐assembly technology to prepare cobalt‐based hybrid‐coated modified Al powder (Al@CZ).
Chong Chen +11 more
wiley +1 more source
, 2003 一种丙烯二聚制备六碳烯烃的反应，由二(水杨醛亚胺)镍(II)配合物、有机铝化合物，或二(水杨醛亚胺)镍(II)配合物、有机铝化合物和有机膦组成。该体系在有机溶剂存在下，催化丙烯二聚反应。利用二(水杨醛亚胺)镍(II)配合物、有机铝化合物体系催化丙烯二聚反应，催化活性可达60000-120000mol C3＝/mol Ni·h，二聚选择性为70-90％，二聚产物中甲基戊烯(MP)的含量为80％；用二(水杨醛)镍(II)配合物、有机铝化合物和有机膦体系催化丙烯二聚反应，催化活性高达240000mol C3＝/
陆世维, 吴思忠
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, 2017 以N，N-亚甲基双丙烯酰胺为交联剂，先通过光引发聚合制备聚丙烯酰胺水凝胶内嵌聚苯乙烯胶体晶体的聚合胶体晶体（PCC），再将PCA2与氯化1-烯丙基-3-甲基咪唑离子液体进行溶剂置换，制备了离子液体聚合胶体晶体（ILPCC）。采用反射光谱研究了制备过程中聚合胶体晶体结构的变化，考察了ILPCC的压力响应性和压缩性能。研究表明，离子液体使胶体晶体的带隙先蓝移后红移，达到平衡时带隙红移220nm以上。离子液体显著改善了聚合胶体晶体的存储稳定性和压缩性能 ...
汤克勇 +4 more
core +2 more sources
Two decades of changes in the global network of illegal wildlife trade
Conservation Biology, Volume 40, Issue 2, April 2026.Abstract Understanding how illegal wildlife trade (IWT) has changed over time is fundamental for biodiversity conservation; however, knowledge of the network remains limited. We used TRAFFIC's IWT dataset, legal trade data from the CITES legal wildlife trade database as a benchmark, and network analysis to identify changes in IWT from 2000 to 2022. The
J. H. Tow +5 more
wiley +1 more source
, 2014 本发明公开了一种以聚乙二醇（PEG）/甲醇为致孔剂，甲基丙烯酸-乙二醇二异丁烯酸酯（MAA-EDMA）为体系聚合物整体柱制备方法和应用。它具有聚合物骨架，有良好的反相分离性能，渗透性好、相比高、生物适应性好的优点。PEG/甲醇的引入，不但解决了以前传统十二醇/甲苯体系带来的合成上的环境不友好、毒性，而且通过不同聚合度的PEG（即PEG的链长）可以非常灵活地调节聚合物整体柱的通透中孔以适应不同的应用需求。本法通过AIBN引发本体聚合，把各种反应试剂加入毛细管柱中，通过一步法制备目标聚合物整体柱 ...
石先哲, 许国旺, 窦阿波
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Zhongguo shiyan zhenduanxue, 2011 D-二聚体（D-Dimer）是交联纤维蛋白的特异性降解产物,是体内高凝状态和继发性纤溶的标志物。目前D-二聚体的检测标本均为静脉血,尚未做过动脉血的检测。本实验同时检测患者动脉血和静脉血中D-二聚体的含量,比较其差异,报道如下。
吴坤芳, 刘嫦玉
doaj
Social protection in fragile and conflict affected settings: The case of Sudan
International Social Security Review, Volume 79, Issue 2, Page 17-42, April/June 2026.Abstract This article examines Sudan’s state‐led social protection system by conducting a mapping of the country’s main social protection schemes, drawing on legislative documents and secondary reports as well as the 2022 Sudan Labor Market Panel Survey.
Dáire Brady, Zina Nimeh
wiley +1 more source
, 2009 采用我国东北地区的连续施肥28 a的典型黑土,通过颗粒分组的方法,研究了长期不同施肥处理对土壤团聚体形成和有机碳在各级团聚体中的分布规律,以及各粒级团聚体对养分的贡献能力的影响。结果表明,施用有机肥促进了土壤中大颗粒团聚体(>0.25 mm)的形成,尤其以21 mm粒级增加的比例最大;而当化肥和有机肥配合施用后 ...
有效性 +3 more
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