Results 21 to 30 of about 20,201 (116)

In‐Situ Construction of Multi‐Scale Heterogeneous Structures in L‐DED IN718 Coatings via WMoTaNb Incorporation for Enhanced Strength‐Toughness Synergy

open access: yesRare Metals, Volume 45, Issue 10, October 2026.
ABSTRACT To improve the strength–toughness balance of IN718, and alleviate the brittleness commonly associated with refractory high‐entropy alloys, this study proposes a novel strategy to fabricate defect‐free IN718/WMoTaNb heterogeneous multiprincipal element alloy coatings via laser‐directed energy deposition.
Zhao Wang   +7 more
wiley   +1 more source

基于变权系数的GIS运行状态多层模糊综合评判

open access: yesGaoya dianqi, 2018
评估GIS运行状态通常采用基于层次分析法的多层模糊综合评判方法,该方法未充分考虑某些评价因素的变化程度不同时对评判结果的影响程度的差异,降低了评估结果的可靠性。为提升GIS评估结果的可靠性,文中提出采用变权系数的多层次模糊综合评价模型,综合GIS工作环境、外观情况、维修状态、生产厂家和附件情况等建立GIS层次型评估指标体系,在常权权重的基础上引入均衡函数的变权模式修正各指标权重系数,利用模糊统计法和模糊分布法确定各指标的隶属函数,通过各影响因素状态、模糊权重矩阵融合各评价因素的隶属函数 ...
周勇   +5 more
doaj  

公共数据的产权运行机制与技术方案

open access: yes大数据
公共数据的要素化既有迫切需求和巨大价值,又具备良好基础和实施保障。为了实现公共数据的要素化,数据要素智能构建技术与公共数据产权运行机制需要协同创新和融合发展。梳理了公共数据的分类和参与主体,提出一套公共数据产权运行机制,包括公共数据产权结构性分置制度、公共数据确权授权机制和个人信息授权机制,并搭建一套数字化系统来承载该机制,以建立健全数据要素各参与方的合法权益,促进公共数据在政府各部门、各层级、各主体之间的安全、合规、有序流通。
郑宇
doaj   +1 more source

Design and implementation of a new urban land registration system with client/server(一种新型的网络级城镇地籍管理系统设计及实现)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2000
本文讨论了自主开发的网络级城镇土地产权产籍管理系统(ReGIS)的系统构成,分析了ReGIS的数据结构,给出了ReGIS系统的实现方法.
LIURen-yi(刘仁义), LIUNan(刘南)
doaj   +1 more source

Light‐Synergistic Enhanced Synaptic Devices Toward Superadditive In‐Sensor Computing

open access: yesRare Metals, Volume 45, Issue 10, October 2026.
ABSTRACT Conventional neuromorphic devices face challenges in achieving efficient integration of light sensing and synaptic computation because of structural and material limitations. In this work, we developed an indium‐tin‐zinc oxide/transparent gelatin electrolyte synaptic transistor incorporating rare metal indium.
Wei Zhong   +16 more
wiley   +1 more source

Balancing d‐π/d‐π* Interactions: Valence‐Engineered Pd/TiO2 for Photocatalytic Acetylene Semi‐Hydrogenation

open access: yesRare Metals, Volume 45, Issue 10, October 2026.
ABSTRACT Photocatalytic acetylene (C2H2) semihydrogenation is a green route for ethylene (C2H4) production, yet the activity–selectivity trade‐off caused by imbalanced adsorption/activation of reactants and products remains a core challenge. Herein, we realize precise regulation of Pd oxidation states (Pd0, Pdδ+, and Pd2+) on anatase TiO2 nanocubes via
Zhidan Wang   +7 more
wiley   +1 more source

DRM技术及其在电子书发行平台构建中的应用

open access: yes四川大学学报. 自然科学版, 2006
作者阐述了数字版权管理DRM(Digital Rights Management)的基本概念,功能架构,以及涉及的技术.对DRM系统中的密钥管理、数字权利的转移、数字版权描述做了扩展,研究了数字内容发行中的必要组成部分,并结合实际商业营运模式提出了可携式电子出版品和可携式电子书载具的概念以及可携式电子书版权控制的基本思想.依据电子书交换系统EBX(Electronic Book Exchange)的DRM技术构建了一个电子书发行平台,实现了电子书出版、销售以及用户购买、阅读过程中的版权保护.
朱兴东   +4 more
doaj  

云南电网输电线路鸟害故障风险评估方法

open access: yesGaoya dianqi, 2020
近年来,鸟害故障在云南电网输电线路跳闸故障中所占的比例逐渐增高,已成为影响输电线路安全稳定运行的主要故障之一。文中通过收集云南电网2014—2016年3年来鸟害跳闸故障的历史数据,根据鸟害跳闸故障的地理特征以及杆塔结构特征,建立鸟害风险评估层次结构模型。采用专家调查法与模糊层次分析法相结合的综合评价方法,利用专家级调查法确定1级指标权重系数,利用模糊层次分析法确定2级指标权重系数。在模糊层次分析法中,利用鸡群优化算法对权重系数进行优化,降低数据处理复杂度,使权重系数求取更加准确。然后通过历史鸟害故障数据,
黄绪勇, 沈志, 王昕
doaj  

A half-discrete Hilbert-type inequality with multi-parameters(一个半离散含多参数的Hilbert型不等式)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2012
应用权系数的方法及Hadamard不等式,建立了一个具有最佳常数因子的半离散含多参数的Hilbert型不等式,并考虑了它的等价式.
YANGBi-cheng(杨必成)   +1 more
doaj   +1 more source

The New World Order and National Security Dynamics of African States: Case Studies of Cameroon and Mali

open access: yesWorld Affairs, Volume 189, Issue 4, Winter 2026.
ABSTRACT The move from unipolarity to a fluid and contested multipolar world order has significantly changed the way African nations form national security policy due to changes in the nature of the strategic environment of those states. Much of the literature has focused on how the actions of major world powers ‐ the United States, China and Russia ...
Chick Edmond   +2 more
wiley   +1 more source

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