检索结果-南通市图书馆

环渤海地区国土空间利用质量时空演化及障碍因子分析

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

地理研究 2024年第3期43卷 736-753页

作者：李睿倩单季香赵健胡恒刘大海王桂芬李永富中国海洋大学国际事务与公共管理学院青岛266100 中国海洋大学海洋发展研究院青岛266100 自然资源部海岸带科学与综合管理重点实验室青岛266061 国家海洋技术中心天津300112 自然资源部第一海洋研究所青岛266061 河海大学海洋学院南京210024

在中国经济转向高质量发展和进行空间重塑的关键时期,深入审视国土空间利用质量及其演进问题,可为构建高质量发展的空间格局提供关键依据,对于扭转高速增长阶段空间利用逻辑、提升区域空间治理水平具有重要意义。文章从承载客体、活动... 详细信息

在中国经济转向高质量发展和进行空间重塑的关键时期,深入审视国土空间利用质量及其演进问题,可为构建高质量发展的空间格局提供关键依据,对于扭转高速增长阶段空间利用逻辑、提升区域空间治理水平具有重要意义。文章从承载客体、活动主体和二者相互作用产生的能力视角深化国土空间利用质量内涵,明确提出结构、效率和活力是国土空间利用质量的核心指示要素。以此为基础,运用熵权TOPSIS法、核密度估计、障碍度模型评价2010—2019年环渤海地区国土空间利用质量,揭示其时空分异特征、演化规律和障碍因子。结果表明:(1)环渤海地区国土空间综合利用质量缓慢增长;生产、生活和生态空间利用质量分别表现为高水平均衡演进、各等级平稳提升和“波动式”下降态势。(2)综合利用质量整体呈“三足鼎立”的高值集聚态势;生产空间利用质量在辽宁沿海出现中低值塌陷,生活空间沿北岸一带形成中高值集聚区,生态空间利用质量水平东降西升,高值碎片化明显。(3)区域国土空间综合利用质量主要受制于生产空间,突出表现在生产效率和生产活力,同时生态结构、生态效率和生活活力类因子的障碍度日益增强,地区分异明显。研究为深化国土空间利用质量的理论认知提供了新视角,为优化国土空间利用质量评价提供了科学指引,并为推进沿海区域高质量发展提供有益支撑。

关键词：国土空间利用质量生产-生活-生态空间时空演化障碍因素高质量环渤海地区

Characterization of local chemical ordering and deformation behavior in high entropy alloys by transmission electron microscopy

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,metallurgy and Materials 2024年第5期31卷 877-886页

作者： Qiuhong liu Qing Du Xiaobin Zhang Yuan Wu Andrey A.Rempel Xiangyang Peng Xiongjun liu Hui Wang Wenli Song Zhaoping Lü beijing Advanced Innovation Center for Materials Genome Engineering State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083China school of Materials science and Engineering Ocean University of ChinaQingdao 266100China Institute of metallurgy of the Ural Branch of the Russian Academy of sciences Ekaterinburg 620016Russia china Nuclear Power technology Research Institute Co.Ltd. Shenzhen 518000China Institute of High Energy Physics Chinese Academy of Sciences(CAS)Beijing 100049China Spallation Neutron Source science Center Dongguan 523803China

Short-range ordering(SRO)is one of the most important structural features of high entropy alloys(HEAs).However,the chemical and structural analyses of SROs are very difficult due to their small size,complexed compositions,and varied *** electron microscopy(TEM)as well as its aberration correction techniques are powerful for characterizing SROs in these compositionally complex *** this short communication,we summarized recent progresses regarding characterization of SROs using TEM in the field of *** using advanced TEM techniques,not only the existence of SROs was confirmed,but also the effect of SROs on the deformation mechanism was ***,the perspective related to application of TEM techniques in HEAs are also discussed.

关键词： high entropy alloys transmission electron microscopy short-range ordering deformation mechanisms

OBSERVATION　OF　DISLOCATION　CONFIGURATIONS　IN　AGED　＆　DEFORMED　NiAl　ALLOY　AFTER　HOT　ISOSTATIC　PRESSING　（HIP）

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 1996年第4期9卷 278-283页

作者： Cui Yuexian Dong Shangli liu Bo Li Daoming Yang Dezhuang(Schwa of Materials Sccience and Engineering, Harbin instituteOf technology, Harbin, china, 150001 )Bi Geping Wang Qin(Central iron and Steel Research institute, beijing china, 100081 ) Sch. of Mat. science and Engineering Harbin Institute of Technology Harbin 150001 China Ctrl. Iron and Stl. Res. Institute Beijing 100081 China

Observation of dislocation configurations was conducted for aged and compressive deformed (Ni64A136) FeMoB alloy after hot isostatic pressing (HIP). It isshown that short and straight parallel dislocations are present in the matrix of NiAI *** and tortuous dislocations and superdislocations appear in the 1%-deformed specimen. As the compressive strain increases to 2. 6%, high-densities dislocations appear inand between the deformation bands. The dislocations become tangled up in the specimencompressed to a strain of 6. 2 %.

关键词： NiAl hot isostatic press compressive deformation dislocations(materials) aging (metallurgy)

Innovations in metallurgical and materials processes:advancing liquid theory and honoring ***-jie Guo's contributions to physical chemistry in metallurgy

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2024年第1期31卷 1-2页

作者： Shuai liu Jing Guo Han-jie Guo school of Artificial Intelligence Beijing Technology and Business UniversityBeijing100048China school of Metallurgical and Ecological Engineering University of Science and Technology Beijing(USTB)Beijing100083China

Spanning three decades,***-jie Guo's research group has dedicated itself to exploring the fundamental theories and practical applications of physical chemistry within the realm of *** under the assumption that molecul... 详细信息

关键词： chemistry liquid complexes

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

海底掩埋目标声探测与识别关键技术进展

哈尔滨工程大学学报 2024年第5期45卷 910-921页

作者：刘梦婷于盛齐谢志敏秦志亮解闯郑毅赵吉祥哈尔滨工程大学水声技术重点实验室黑龙江哈尔滨150001 海洋信息获取与安全工信部重点实验室(哈尔滨工程大学) 黑龙江哈尔滨150001 哈尔滨工程大学水声工程学院黑龙江哈尔滨150001 青岛哈尔滨工程大学创新发展中心山东青岛266400 海军军事海洋环境建设办公室北京100166

为了准确呈现海底掩埋目标声探测与识别研究存在的问题与技术难点,推动该领域相关技术的发展,本文主要从探测系统及信号处理技术两方面出发进行研究。首先分析了基于水声探测海底掩埋目标所面临的难点,介绍了国内外掩埋目标声探测与识... 详细信息

为了准确呈现海底掩埋目标声探测与识别研究存在的问题与技术难点,推动该领域相关技术的发展,本文主要从探测系统及信号处理技术两方面出发进行研究。首先分析了基于水声探测海底掩埋目标所面临的难点,介绍了国内外掩埋目标声探测与识别系统,然后论述了抗混响、特征提取、目标检测和目标识别等关键技术环节的主要研究进展,最后总结了掩埋目标探测与识别面临的问题和挑战,并对未来发展方向进行了展望。

关键词：掩埋目标探测系统信号处理水声探测抗混响特征提取目标检测目标识别

维普期刊数据库博看期刊

Preparation of sodium molybdate from molybdenum concentrate by microwave roasting and alkali leaching

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,metallurgy and Materials 2024年第1期31卷 91-105页

作者： Fengjuan Zhang Chenhui liu Srinivasakannan Chandrasekar Yingwei Li Fuchang Xu school of Chemistry and Environment Yunnan Minzu UniversityKunming 650500China Chemical Engineering Department Khalifa UniversityAbu DhabiUAE Yunnan Zhong Tai technology Co. Ltd.Kunming 650500China Yunnan Yongchang Silicon Industry Co. Ltd.Baoshan 678000China

The preparation process of sodium molybdate has the disadvantages of high energy consumption,low thermal efficiency,and high raw material requirement of molybdenum trioxide,in order to realize the green and efficient development of molybdenum concentrate resources,this paper proposes a new process for efficient recovery of molybdenum from molybdenum concentrate and preparation of sodium molybdate by microwave-enhanced roasting and alkali *** analysis indicated the feasibility of oxidation roasting of molybdenum *** effects of roasting temperature,holding time,and power-to-mass ratio on the oxidation product and leaching product sodium molybdate (Na_(2)MoO_(4)·2H_(2)O) were *** the optimal process conditions:roasting temperature of 700℃,holding time of 110 min,and power-to-mass ratio of 110 W/g,the molybdenum state of existence was converted from MoS_(2) to Mo *** process of preparing sodium molybdate by alkali leaching of molybdenum calcine was investigated,the optimal leaching conditions include a solution concentration of 2.5 mol/L,a liquid-to-solid ratio of 2 mL/g,a leaching temperature of 60℃,and leaching solution termination at pH *** optimum conditions result in a leaching rate of sodium molybdate of 96.24%.Meanwhile,the content of sodium molybdate reaches 94.08wt%after leaching and removing *** and aluminum impurities can be effectively separated by adjusting the pH of the leaching solution with sodium carbonate *** research avoids the shortcomings of the traditional process and utilizes the advantages of microwave metallurgy to prepare high-quality sodium molybdate,which provides a new idea for the highvalue utilization of molybdenum concentrate.

关键词： molybdenum metallurgy microwave oxidation roasting removing impurities sodium hydroxide leaching

Enhancing ionic conductivity of garnet-type Nb-doped Li_(7)La_(3)Zr_(2)O_(12)by cerium doping

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2024年第9期42卷 1740-1746,I0004页

作者： Daming liu Yuan Hou Chaoke Bulin Ruichao Zhao Bangwen Zhang Analytical and Testing Center Inner Mongolia University of Science and TechnologyBaotou014010China school of Materials and metallurgy Inner Mongolia University of Science and TechnologyBaotou014010China school of metallurgy and Materials Engineering Chongqing University of Science and TechnologyChongqing401331China

We investigated the effect of additional doping with Ce on the ionic conductivity of the Nb-doped Li_(7)La_(3)Zr_(2)O_(12)(LLZO)garnet ceramics using a combination of experimental and modeling *** results indicate that Ce doping can alter lattice parameters of the LLZNO,leading to the enhanced lithium ionic *** Ce,Nb co-doped LLZO(LLZNCO)structure with composition Li_(6.5)La_(3)Zr_(1.5-x)Nb_(0.5)Ce_(x)O_(12)(x=0.125)exhibits a lower activation energy(E_(a)=0.39 eV)than Li_(6.5)La_(3)Zr_(1.5)Nb_(0.5)O_(12)(LLZNO)(E_(a)=0.41 eV).Furthermore,Ce doping leads to an increase in Li~+conductivity from 6.4×10^(-4)to 7×10^(-4)S/cm at room *** addition,we discuss the diffusivity and conductivity of our samples using ab initio molecular dynamics simulations and propose possible mechanisms to explain the enhanced Li-ion conductivity caused by co-doping with Ce and *** results demonstrate that the LLZNCO ceramics are promising candidates for potential solid-state electrolytes for Li-ion batteries.

关键词： Rare earths Solid state electrolyte Ionic conductivity Doping

Machine learning-assisted efficient design of Cu-based shape memory alloy with specific phase transition temperature

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,metallurgy and Materials 2024年第4期31卷 773-785页

作者： Mengwei Wu Wei Yong Cunqin Fu Chunmei Ma Ruiping liu Department of Materials science and Engineering China University of Mining&Technology(Beijing)Beijing 100083China Institute for Advanced Materials and technology University of Science and Technology BeijingBeijing 100083China

The martensitic transformation temperature is the basis for the application of shape memory alloys(SMAs),and the ability to quickly and accurately predict the transformation temperature of SMAs has very important practical *** this work,machine learning(ML)methods were utilized to accelerate the search for shape memory alloys with targeted properties(phase transition temperature).A group of component data was selected to design shape memory alloys using reverse design method from numerous unexplored *** modeling and feature modeling were used to predict the phase transition temperature of the shape memory *** experimental results of the shape memory alloys were obtained to verify the effectiveness of the support vector regression(SVR)*** results show that the machine learning model can obtain target materials more efficiently and pertinently,and realize the accurate and rapid design of shape memory alloys with specific target phase transition *** this basis,the relationship between phase transition temperature and material descriptors is analyzed,and it is proved that the key factors affecting the phase transition temperature of shape memory alloys are based on the strength of the bond energy between *** work provides new ideas for the controllable design and performance optimization of Cu-based shape memory alloys.

关键词： machine learning support vector regression shape memory alloys martensitic transformation temperature

Effect of Ni content on the wear behavior of Al-Si-Cu-Mg-Ni/SiC particles composites

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,metallurgy and Materials 2024年第2期31卷 374-383页

作者： Yanyu liu Lina Jia Wenbo Wang Zuheng Jin Hu Zhang school of Materials science and Engineering Beihang UniversityBeijing 100191China Ningbo Institute of technology Beihang UniversityNingbo 315100China Qingdao Research Institute of Beihang university Qingdao 266000China Research Institute for Frontier science Beihang UniversityBeijing 100191China

In recent years,the addition of Ni has been widely acknowledged to be capable of enhancing the mechanical properties of Al-Si ***,the effect of Ni on the wear behaviors of Al-Si alloys and Al matrix composites,particularly at elevated temperat-ures,remains an understudied *** this study,Al-Si-Cu-Mg-Ni/20wt%SiC particles(SiCp)composites with varying Ni contents were prepared by using a semisolid stir casting *** effect of Ni content on the dry sliding wear behavior of the prepared compos-ites was investigated through sliding tests at 25 and 350℃.Results indicated that theθ-Al_(2)Cu phase gradually diminished and eventually disappeared as the Ni content increased from 0wt%to 3wt%.This change was accompanied by the formation and increase inδ-Al_(3)CuNi andε-Al_(3)Ni phases in *** hardness and ultimate tensile strength of the as-cast composites improved,and the wear rates of the composites decreased from 5.29×10^(−4)to 1.94×10^(−4)mm^(3)/(N∙m)at 25℃and from 20.2×10^(−4)to 7×10^(−4)mm^(3)/(N∙m)at 350℃with the increase in Ni content from 0wt%to 2wt%.The enhancement in performance was due to the presence of strengthening network structures and additional Ni-containing phases in the ***,the wear rate of the 3Ni composite was approximately two times higher than that of the 2Ni composite due to the fracture and debonding of theε-Al_(3)Ni *** wear,delamination wear,and oxidation wear were the predominant wear mechanisms of the investigated composites at 25℃,whereas delamination wear and oxid-ation wear were dominant during sliding at 350℃.

关键词： Al matrix composite microstructure sliding test high temperature wear mechanism