Results 131 to 140 of about 18,206 (246)
Research on the Optimization of Industrial Structure of Xiuyu District through Developing Modern Logistics [PDF]
, 2013 第三产业的发展水平是衡量一个国家和地区社会经济发展水平的重要标志。近年来，莆田市秀屿区三次产业结构变化体现了世界范围产业结构演变规律，即第一产业比重下降，第二产业稳定增长，第三产业比重不断上升。但是秀屿第三产业发展水平仍十分滞后，存在着规模小、传统行业比重大、内部结构发展不协调等问题。如今，国内外普遍认为现代物流业对带动相关产业发展与结构优化升级、促进国民经济增长有着重要的作用，其在国民经济建设中的重要地位逐步确立并呈现蓬勃发展的良好态势。秀屿区发展现代物流业具有得天独厚的优势，根据秀屿区“十二五 ...
柯名寰
core
MXene‐Based Materials: Compositional Engineering for High‐Performance Microwave Absorption
Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT The rapid advancement of aerospace and electronic information technologies has imposed increasingly stringent requirements on microwave absorbing materials (MAMs), such as high absorption efficiency, lightweight, and environmental stability, making the development of advanced MAMs urgent for both civilian and national defense applications ...
Pan‐Pan Zhou +8 more
wiley +1 more source
Gaoya dianqi, 1998 采用遗传算法,对高压SF6断路器的部分结构进行了优化,并对电场进行了详细的计算。主要对均压环、弧触头、主触头、喷口等结构进行了优化及分析,分别进行了讨论。并且进行了综合优化。整个计算软件通用性强,使用方便,前处理简单,后处理形象、直观。
王尔智, 董恩源, 徐建源
doaj
The Research of Shipping Finance Innovation in the Construction of Shanghai Internatianal Shipping Center [PDF]
, 2015 本文以上海拟在2020年基本建设成为国际航运、金融中心的战略目标为背景，基于航运与金融之间密不可分、相辅相成的联系，从国内外航运金融的发展现状入手，借鉴世界航运金融中心伦敦以及地区中心新加坡的成功经验，比较分析上海建设航运中心所面临的包括政策环境制约、技术服务能力不足以及配套体系缺失等系列问题，以及上海发展航运金融过程中在融资服务、海上保险、资金结算及航运金融衍生品领域出现的创新需求。 最后，文章结合互联网时代、大数据技术的运用，从融资服务、海上保险、资金结算以及金融衍生品四个维度提出具体的产品创新建议；
项震
core
Optimization analysis of ingate supporting structure under the condition of thick loose layer and thin bedrock [PDF]
Aiming at the technical problems of ingate support under the condition of thick loose layer and thin bedrock, taking ingate of Dongfeng Well in Qinan Mine as the engineering background, we analyzed the original support design scheme by using FLAC3D, and ...
Chengtao LI +4 more
core +1 more source
Risk, Hazards &Crisis in Public Policy, Volume 17, Issue 1, March 2026.ABSTRACT Hybrid crisis governance – combining hierarchical control with networked collaboration – has gained increasing attention in the public policy and crisis management literatures. Yet, the concept of hybridity remains crude and underdefined, limiting its analytical utility.
Svante Aasbjerg Thygesen +2 more
wiley +1 more source
The Application of Structure Analysis and Optimization under Impact Load [PDF]
, 2012 现代结构优化设计方法以结构动力学为基础，计算机辅助工程（CAE）为手段，采用虚拟样机技术，高效快速地完成产品结构设计工作。相比于传统设计的经验设计——样机实验——修改设计多次反复的过程，现代结构优化设计方法在保证产品结构可靠性、缩短开发周期、寻求结构的最优设计方案以及降低成本等方面具有十分重要的作用。 结构承受冲击载荷在工程领域十分普遍，其分析与优化涉及非线性特性受到研究者的关注而成为研究热点。 本文结合相关课题，依据结构优化设计方法与跌落冲击理论，以有限元分析软件为主要工具 ...
李文彪
core
Disaster Cross‐Sector Collaboration Networks: Evidence from Four Historical Disasters
Risk, Hazards &Crisis in Public Policy, Volume 17, Issue 1, March 2026.ABSTRACT By conducting content analysis and social network analysis of media coverage of four historical disasters (i.e., the 2011 Joplin Tornado, 2013 Moore Tornado, 2017 Hurricane Harvey, and the 2023 Maui wildfire), this study uncovered characteristics of cross‐sector disaster collaboration networks.
Xiaochen Angela Zhang, Jonathan Borden
wiley +1 more source
Application of BHMC Algorithm in the Stable Structure Optimation of Alloy Clusters [PDF]
, 2017 金属团簇由于其特殊性质，广泛地应用于物理、化学等众多领域。合金团簇充分地利用多种金属之间的协同效应实现了材料的多功能特性，而其稳定结构则是研究这些多功能特性的重要基础，因此备受关注。利用势能函数求解合金团簇稳定结构优化时，随着合金原子数的增加，合金团簇体系势能面上的局部极小值个数将会呈现指数倍数的增长，使得寻找高效的结构优化算法变得至关重要。传统的求解方法由于其求解的效率，难以获得较好质量的解，所以基于进化算法的团簇结构全局优化算法应运而生 ...
季清爽
core
Functional Ecology, Volume 40, Issue 3, Page 636-654, March 2026.Read the free Plain Language Summary for this article on the Journal blog. Abstract The nested subset pattern (nestedness) has been widely used to explain species distributions in island and fragmented systems. Mountain sky islands serve as critical natural laboratories for understanding the evolutionary consequences of geographic isolation and climate
Caiwen Zhang +5 more
wiley +1 more source