Results 131 to 140 of about 13,453 (210)
Rare Metals, EarlyView.ABSTRACT Two‐dimensional (2D) nonlayered niobium nitrides have attracted considerable interest for electrochemical energy storage. However, the synthesis of these materials is hampered by their nonlayered crystal structures, which are characterized by strong three‐dimensional chemical bonding.
Rui Huo +7 more
wiley +1 more source
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
Rare Metals, EarlyView.ABSTRACT Efficient and durable bifunctional electrocatalysts are vital for scalable water electrolysis. Here, we realize cobalt‐vacancy (Covac) engineering in CoFeP supported on N,P‐codoped carbon nanocages (Co1‐vacFeP/NPC) through a simple route comprising a CoFe Prussian blue analog precursor, phosphidation–pyrolysis, tannic‐acid etching, and a ...
Yuan‐Liang Yuan +6 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
Rare Metals, EarlyView.ABSTRACT Developing Cu‐based composites that simultaneously achieve ultra‐high strength, ductility, and electrical conductivity remains critical for advanced electrical contact applications. In this work, multiphase AlCrCuFeNi2.5 high‐entropy alloy (HEA) reinforcements are incorporated into CuCrZr matrix via spark plasma sintering (SPS) and annealing ...
Tao Hong +8 more
wiley +1 more source
Jianzhu Gangjiegou Jinzhan, 2003 本文研究带中心支撑钢框架结构的地面运动与控制结构反应的结构特性参数之间的关系,并对设计方法和规范进行了优化。文章重点研究了三层和六层带侧向中心支撑的钢框架结构,讨论了这些支撑的力学性能和优点 ...
方明霁
doaj
Rare Metals, EarlyView.ABSTRACT The development of efficient and stable bifunctional catalysts remains a key challenge for green hydrogen production via electrochemical water splitting. In this study, a bimetallic Mo/Fe‐doped CoP2 nanoleaf array anchored on carbon cloth (Mo, Fe‐CoP2@CC) was synthesized from zeolitic imidazolate framework‐L (ZIF‐L) via an ion‐exchange and low‐
Xiangqun Zeng +6 more
wiley +1 more source
Gaoya dianqi, 2015 文中建立了风电场经两种拓扑结构的VSC-MTDC并入电网的模型,两种模型为串联模型和并联模型,并基于两种拓扑结构的比较结果对多端柔性直流输电控制器进行了优化。仿真模型主要包括:风电场等效聚合模型,风电场换流站控制器,直流电缆的Bergeron模型。优化方法采用单纯形算法。将两种拓扑结构的模型进行了仿真分析,仿真结果显示,在考虑到受交流系统扰动以及风电场侧切机情况下的稳定性,并联系统更加适合海上风电场经柔性直流输电并网。采用单纯形优化后的VSC-MTDC动态响应能力相对于优化改进前有了很大的提高。
于永生 +3 more
doaj
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
Rare Metals, EarlyView.ABSTRACT Expanding near‐infrared (NIR) spectral response and utilizing ultraviolet (UV) photons are effective strategies for enhancing the power conversion efficiency (PCE) of lead halide perovskite solar cells (PSCs). However, the range of NIR spectral response extension and the utilization of UV light for devices are not enough, and the loss of ...
Li He +9 more
wiley +1 more source