Results 31 to 40 of about 13,453 (210)

Prioritized Lithium Extraction From Spent Lithium‐Ion Batteries via Low‐Temperature Chlorination Mediated by Seawater‐Derived Chlorides

open access: yesRare Metals, EarlyView.
ABSTRACT Chlorination roasting has emerged as a promising pyrometallurgical strategy for the selective recovery of lithium from spent lithium‐ion batteries (LIBs). In this study, a natural roasting agent, seawater‐derived chlorides, was employed to selectively extract lithium from spent LiNi0.5Co0.2Mn0.3O2 (NCM523) cathode. MgCl2·6H2O, a main component
Bei‐Lei Zhang   +7 more
wiley   +1 more source

变压器分接开关内酚醛压板的神经网络全局优化设计

open access: yesGaoya dianqi, 2011
为改善变压器分接开关电场环境,笔者重点研究了变压器分接开关内酚醛压板的电场分布,利用有限元法计算了这种绝缘结构的电场,提出了结构设计的神经网络最优化方法。在神经网络最优化方式中,构建酚醛压板绝缘结构参数——电场分布的多输入—多约束输出神经网络模型,利用最优化方法构建优化算法,真正实现了酚醛压板绝缘结构的全局优化设计。结果表明,该方法对于研究多输入—多约束输出模型的全局优化设计具有普遍的指导意义。
蒋战朋, 文远芳, 范小辉
doaj  

Efficient GPU parallel strategy for multi-scale topology optimization via asymptotic homogenization(面向多尺度拓扑优化的渐进均匀化GPU并行算法研究)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2023
针对多尺度结构拓扑设计计算效率低等问题,提出了一种基于水平集渐进均匀化的多尺度拓扑优化并行算法。基于通用图形处理器(graphics processing unit ,GPU),通过水平集初始化、大型稀疏刚度矩阵方程求解以及本构矩阵并行计算,可大幅提升渐进均匀化算法的效率。实验结果表明,当三维晶胞单元网格细化至分辨率为10万时,多尺度结构拓扑优化GPU并行算法较CPU串行算法快数十倍。
夏兆辉(XIA Zhaohui)   +6 more
doaj   +1 more source

Research on China's Outward FDI and Industry Upgrading: Based on the Perspective of Value Chain Upgrading [PDF]

open access: yes, 2016
进入21世纪以来,随着我国加入WTO和经济高速增长,企业“走出去”(OFDI)的规模迅速扩大,目前每年的流量已经与InwardFDI相当,逐步成为世界投资大国。2008年金融危机后,我国经济进入“新常态”,国内经济增速下滑、形势日益严峻,经济结构优化和经济模式转化进程缓慢。在此条件下,国家实施了“一带一路”倡议和“亚投行”战略,并发布《中国制造2025》白皮书,意在加快对外投资、促进国际产能合作和国内产业升级。本文基于价值链升级的视角,利用微观企业数据,试图研究我国企业OFDI对产业升级的影响 ...
王博
core  

Spatial Multi-objective Optimization of Land Use of Kashgar Area Based on NSGA-Ⅱ and GeoSOS-FLUS [PDF]

open access: yes, 2022
[Objective] The spatial optimization of land resources in the Kashgar area was studied to provide theoretical support for sustainable development of the society and economy of the area. [Methods] Food security, economic benefits, and ecological benefits (
Gou Zhenzhen   +4 more
core   +1 more source

Fabrication‐Driven Oxidation Pathways in Y/Hf‐Modified High‐Entropy Alloys: From Elemental Segregation to Oxide Homogeneity

open access: yesRare Metals, EarlyView.
ABSTRACT This study elucidates the oxidation mechanisms governing Y/Hf‐doped AlCoCrFeNiTi high‐entropy alloys (HEAs) and reveals the pivotal role of fabrication processes in dictating high‐temperature oxidation behavior. We demonstrate that casting and spark plasma sintering (SPS) promote Y/Hf segregation, resulting in heterogeneous oxide formation and
Huaqing Yi   +5 more
wiley   +1 more source

基于一维搜索算法的张弦桁架离散变量优化

open access: yesJianzhu Gangjiegou Jinzhan, 2011
本文采用Matlab语言编写张弦桁架结构模型程序,对张弦桁架在各荷载工况下的受力性能进行了分析;首先采用Matlab语言编写了张弦桁架结构各种约束条件程序,同时编写了基于离散变量的张弦桁架优化设计程序,采用基于离散变量的一维搜索优化算法对拟定的张弦桁架计算模型进行了优化,优化结果表明基于离散变量的一维搜索优化算法,由于目标函数和约束函数的单调性质,得到的解显然是最优解,而且优化结果可以直接应用于结构实际设计。最后,在确保编写的离散变量优化程序正确的前提下,对不同矢高的张弦桁架结构进行了离散变量优化设计 ...
刘树堂, 侯贯泽, 王林建
doaj  

Improve the Success Rate of Acquisition—Reflection on the Failures of Enterprise Merger, Cquisition [PDF]

open access: yes, 2015
目前中国绝大部分行业都处在初创或规模化阶段,政府也不断出台并购政策措施,鼓励企业兼并重组、做大做强和转型升级。中国经济要实现结构优化,并购是必然趋势和必经阶段,通过并购可实现优胜劣汰、产业升级、行业上下游整合,提升经济发展的质量和效率。但并购是高风险的经营活动,风险贯穿于整个活动的全过程。“相关调查研究显示并购失败普遍存在,美国著名咨询公司麦肯锡曾以1986年的财务资料为分析依据,对1972~1983年间英美两国最大工业企业的116项收购案例进行统计分析。结果显示,高达61%的并购交易以失败告终,16 ...
王海容
core  

Twin‐Wire In Situ Additive Manufacturing of NiTiNb Eutectic Alloys: Eliminating Unmelted Nb Particles and Tailored Superelasticity

open access: yesRare Metals, EarlyView.
ABSTRACT A major challenge in fabricating eutectic NiTiNb alloys is the incomplete melting of Nb due to its much higher melting point than the NiTi matrix. In this work, a novel electron‐beam freeform additive manufacturing strategy is developed to eliminate unmelted Nb particles and achieve a fully eutectic structure through independent dual‐wire ...
Qing‐Da Zhang   +9 more
wiley   +1 more source

基于粒子群优化算法(PSO)的张弦桁架结构优化设计

open access: yesJianzhu Gangjiegou Jinzhan, 2011
本文采用Matlab语言编制了张弦桁架结构通用的有限元模型分析程序。通过此程序,可以快捷地得到不同几何参数的张弦桁架结构模型,并能进行杆件内力分析,分别采用SAP2000和ANSYS分析软件对其计算结果进行了验证,结果表明三者的计算结果一致。在此基础上,采用Matlab语言编制了粒子群算法优化程序,对某实际张弦桁架结构采用本文优化方法进行了优化设计,优化结果表明本文提出的优化方法具有较高的精度和较好的收敛性。最后对不同跨度的张弦桁架结构模型进行了截面优化设计,为初步设计提供了参考。
侯贯泽, 刘树堂, 许强松
doaj  

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