Results 111 to 120 of about 45,553 (198)

Surface and Interface Control Of Palladium nanocrystals and Their Catalytic Properties [PDF]

open access: yes, 2014
贵金属纳米催化剂因其广泛的应用前景,一直是人们研究的热点。而随着研究的深入,其表界面结构控制的重要性日益凸显。尽管近年对贵金属纳米催化剂的表界面控制已有不少研究,但在分子水平上理解相关表界面调控的机制研究还有待深入,仍然有很多空间。为此,本论文重点开展钯纳米晶体的表界面结构控制和催化性能方面的研究,主要研究结果如下: 第一章:先简要的介绍了贵金属催化剂的特征及应用,而后详细介绍了影响贵金属纳米催化剂性能的参数,如尺寸,组成,表界面结构等。其中特别强调了表界面调控的重要性,并就目前的研究进展做了综述 ...
代燕
core  

Interventions to Reduce Child Poverty and Its Determinants: A Rapid Overview of Reviews

open access: yesPoverty &Public Policy, Volume 18, Issue 2, June 2026.
ABSTRACT Despite evidence for various child poverty reduction strategies, there is ambiguity regarding the most effective types to inform policy. Thus, we conducted an overview of reviews to systematically identify, appraise, and synthesize interventions for reducing childhood poverty in high‐income country settings.
Omar Dewidar   +9 more
wiley   +1 more source

光纤光缆特性及测试方法研究的最新进展

open access: yesGuangtongxin yanjiu, 2001
介绍 2 0 0 1年 2月在日内瓦召开的 ITU- T第十五研究组会议关于光纤光缆特性及测试方法研究的最新进展 ...
程铭
doaj  

Distribution Pattern of Taxonomic Diversity of Fish Community in Four Typical Mangrove Areas, China [PDF]

open access: yes, 2016
红树林区不仅能为许多海生和陆生生物提供栖息地和食物,还是许多鱼类的育幼场和产卵场,因此红树林区生物多样性成为当今生态学研究热点之一。过去对红树林区鱼类群落的研究多采用传统生物多样性指数,然而传统生物多样性指数在实际运用过程具有过多注重物种丰富度、未考虑物种在分类学上的差异等缺陷。分类多样性指数既考虑了群落中物种数量和均匀程度,也考虑了物种分类地位和生态学上的差异,更全面更有说服力。 为全面了解中国红树林区鱼类物种多样性分布格局,本研究选取福建漳江口、广西茅尾海、广西山口、海南东寨港四个典型的红树林区 ...
陈杰
core  

Metal‐Doped Carbon‐Based Nanomaterials: Photothermal Mechanism Innovation and Precision Therapy Advancement in Antibacterial and Antitumor Applications

open access: yesRare Metals, Volume 45, Issue 5, May 2026.
ABSTRACT Metal‐doped carbon‐based nanomaterials (M‐CNM) play a strategically significant role in next‐generation precision antibacterial and antitumor therapies, as they integrate synergistic photothermal ablation, catalytic reactive oxygen species (ROS) generation, and multimodal imaging capabilities. However, their clinical translation is hindered by
Pengxiang Liu   +5 more
wiley   +1 more source

GIS母线温度在线监测技术研究进展

open access: yesGaoya dianqi, 2012
温度在线监测作为电力设备故障诊断的一个重要手段,如果能够用于GIS的状态监测中,将为GIS的正常运行提供进一步的保障。目前,国内外对GIS母线温度在线监测已经做了一些研究,但尚不能达到实用化程度。笔者对当前GIS母线温度在线监测的研究进展进行介绍,主要包括红外辐射探测技术以及红外热诊断技术两种测温手段,同时,对其需进一步探讨的问题进行了分析。由于GIS母线温度在线监测技术还处于研究阶段,为实现其实用化,相关技术还需要进一步完善。笔者对其今后的研究工作进行了总结和展望。
李璿, 汪本进, 王晓琪
doaj  

Cavity‐Confined Indium Single‐Atom Catalysts Enable Localized Electron Enrichment for Highly Efficient and Selective Photocatalytic CO2 Reduction

open access: yesRare Metals, Volume 45, Issue 5, May 2026.
ABSTRACT Single‐atom catalysts are attractive for CO2 photoreduction due to their maximized atomic utilization and tunable electronic structures. In this study, indium (In) single atoms were incorporated into graphitic carbon nitride (CN) through an impregnation‐assisted thermal polycondensation strategy.
Xueying Guo   +6 more
wiley   +1 more source

Study on transcription factors c-Jun and STAT from Litopenaeus vannamei during WSSV infection [PDF]

open access: yes, 2016
凡纳滨对虾(Litopenaeusvannamei)是我国对虾养殖业的主要品种。然而,病害问题一直困扰着该产业的健康发展。其中白斑综合症病毒(whitespotsyndromevirus,WSSV)是对虾的主要病原体,给对虾产业造成了巨大的经济损失。截止目前,对WSSV还缺乏有效的治疗方法。因此,研究宿主病毒相互作用机制,对寻找阻断病毒感染的靶点具有重要意义。 c-Jun是JNK信号通路下游主要底物分子,参与调控了许多基因的转录。本实验室先前研究表明,凡纳滨对虾JNK被WSSV利用 ...
姚德福
core  

Trends and Challenges in Water Governance Systematic Review and Bibliographic Study of Scientific Publications (2018–2025)

open access: yesWorld Water Policy, Volume 12, Issue 2, May 2026.
ABSTRACT Water governance has emerged as a critical analytical framework for addressing the complexity of socioecological water systems in contexts of increasing climate vulnerability and anthropogenic pressure. This study presents a systematic review and bibliometric analysis of 50 scientific articles indexed on water governance published between 2018
Roger Pichis‐García   +1 more
wiley   +1 more source

电压水平对交流恒压下油楔放电发展及击穿过程的影响

open access: yesGaoya dianqi, 2019
为实现通过局部放电检测来准确诊断电气设备绝缘缺陷并对危险放电状态进行预警,文中对模拟电力变压器绕组匝间和饼间局放缺陷的油楔放电模型,采用恒压法和全实时高频/特高频联合检测系统,对其发展至击穿全过程的局放信号进行了研究。通过改变外施电压,研究了电压水平对油楔放电发展进程的影响;总结了不同电压下油楔放电发展全过程特征参数的变化规律,提出了放电阶段状态划分的方法和原则;从机理的角度对不同阶段的放电机制进行了解释。研究表明,恒压下,不同电压水平油楔放电均存在平稳发展和加速劣化发展两种典型阶段 ...
李金忠   +4 more
doaj  

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