检索结果-南通市图书馆

预处理温度对NiCoCrAlYHf涂层氧化行为及表面粗化机制的影响

在线全文

学校读者我要写书评

暂无评论

表面工程与再制造 2024年第1期24卷 61-62页

作者： Pan Li Xueling Fan pin lu Han Wang Xiaochao Jin Xi'an Key Laboratory of Extreme Environmental and Protection Technology School of Aerospace Engineering Xi'an Jiaotong University Xi'an 710049 China

NiCoCrAlYHf涂层作为热障涂层体系中的粘结层已得到广泛应用,其服役过程中的氧化行为和表面粗化机制受预处理温度的影响较大。为明确预处理温度的影响,对预处理涂层和等温暴露涂层的特性进行了表征和分析,包括微观结构、重量变化、热生... 详细信息

NiCoCrAlYHf涂层作为热障涂层体系中的粘结层已得到广泛应用,其服役过程中的氧化行为和表面粗化机制受预处理温度的影响较大。为明确预处理温度的影响,对预处理涂层和等温暴露涂层的特性进行了表征和分析,包括微观结构、重量变化、热生长氧化物(TGO)厚度和表面粗糙度。

关键词：粗化机制热障涂层预处理温度表面粗糙度氧化行为 NiCoCrAlY 粘结层重量变化

好氧颗粒污泥中硫酸化多糖的生成、提取及表征

在线全文

学校读者我要写书评

暂无评论

中国环境科学 2024年第6期44卷 3160-3166页

作者：魏子涵卢毅鹏高品东华大学环境科学与工程学院上海201620

以厌氧颗粒污泥作为接种污泥,在序批式活性污泥反应器(SBR)中驯化培养好氧颗粒污泥,通过好氧颗粒污泥胞外聚合物(EPS)提取和硫酸化多糖纯化方法的优化,探究好氧颗粒污泥SBR反应器中硫酸化多糖的生成变化.结果表明,好氧颗粒污泥SBR反应... 详细信息

以厌氧颗粒污泥作为接种污泥,在序批式活性污泥反应器(SBR)中驯化培养好氧颗粒污泥,通过好氧颗粒污泥胞外聚合物(EPS)提取和硫酸化多糖纯化方法的优化,探究好氧颗粒污泥SBR反应器中硫酸化多糖的生成变化.结果表明,好氧颗粒污泥SBR反应器运行效果稳定,对污水COD、NH_(4)^(+)-N、TN和TP的去除效果分别可达90%、97%、70%和93%以上.采用超声、水浴和碱处理的组合方法可有效地提取好氧颗粒污泥EPS和硫酸化多糖,经脱蛋白纯化后,硫酸化多糖可达56.6mg/g EPS,约为接种厌氧颗粒污泥中硫酸化多糖含量的1.4倍,表明好氧颗粒污泥有助于生成硫酸化多糖,为污水污泥有机质的高值转化和资源化提供了一种有效途径.

关键词：好氧颗粒污泥硫酸化多糖胞外聚合物污水资源化

Exploring a balance between strength and ductility of hexagonal BN nanoplatelet reinforced ZK61 magnesium composite

在线全文

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2024年第5期12卷 1899-1910页

作者： Kewei Zhang Xiaolong lu Yufeng Sun Shaokang Guan Yao Chen School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China Key Laboratory of Advanced Magnesium Alloys in Henan Province Zhengzhou UniversityZhengzhou 450002China Key Laboratory of Advanced Materials Processing&Mold Ministry of EducationZhengzhou 450002China School of Mechanical and Electrical Engineering Soochow UniversitySuzhou 215021China

The practical applications of magnesium(Mg)alloys are usually beset by their relatively low strength and limited *** we attempt to fabricate hexagonal BN nanoplatelet(BNNP)reinforced ZK61 magnesium composites using a combination of spark plasma sintering and friction stir *** resulting composites exhibit microstructural characteristics of homogeneous dispersion of BNNP in Mg matrix with refined equiaxed grains and(0002)basal texture roughly surrounding the pin column *** electron microscopy observation illustrates that trace amounts of Mg_(3)N_(2)and MgB_(2)form at BNNP-Mg interface,in which Mg_(3)N_(2)locates at the basal plane of a BNNP and MgB_(2)grows at its open *** spatial distribution of Mg_(3)N_(2)and MgB_(2)facilitates interfacial wetting and stronger BNNP-Mg interface in such a way that interfacial products act as anchors bonding between *** comparison with monolithic ZK61 alloy,the BNNP/ZK61 composites display simultaneous improvements in yield strength,hardness and ductility,achieving good strength-ductility *** research is expected to shed some light on BNNP potentials for designing and producing magnesium composites with high strength and good ductility.

关键词： BN nanoplatelet Magnesium composite Strength Ductility Spark plasma sintering Friction stir processing

A symmetric substructuring method for analyzing the natural frequencies of conical origami structures

在线全文

学校读者我要写书评

暂无评论

Theoretical & Applied Mechanics Letters 2024年第3期14卷 203-210页

作者： Chenhao lu Yao Chen Weiying Fan Jian Feng Pooya Sareh Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education and National Prestress Engineering Research CenterSoutheast UniversityNanjing 211189China School of Engineering University of LiverpoolLiverpool L693BXUnited Kingdom Creative Design Engineering Lab(Cdel) School of EngineeringNewcastle UniversityNewcastle upon Tyne NE17RUUnited Kingdom Escuela Técnica Superior de Ingeniería y Diseño Industrial Universidad Politécnica de Madrid(UPM)Madrid 28012Spain

Conical origami structures are characterized by their substantial out-of-plane stiffness and *** investigations have commonly focused on the static characteristics of these lightweight ***,the efficient analysis of the natural vibrations of these structures is pivotal for designing conicalorigami structures with programmable stiffness and *** this paper,we propose a novel method to analyzethe natural vibrations of such structures by combining a symmetric substructuring method(SSM)and a gener-alized eigenvalue *** exploits the inherent symmetry of the structure to decompose it into a finiteset of repetitive *** doing so,we reduce the dimensions of matrices and improve computationalefficiency by adopting the stiffness and mass matrices of the substructures in the generalized eigenvalue *** element simulations of pin-jointed models are used to validate the computational results of the ***,the parametric analysis of the structures demonstrates the influences of the number of seg-ments along the circumference and the radius of the cone on the structural mass and natural frequencies of ***,we present a comparison between six-fold and four-fold conical origami structures anddiscuss the influence of various geometric parameters on their natural *** study provides a strategyfor efficiently analyzing the natural vibration of symmetric origami structures and has the potential to contributeto the efficient design and customization of origami metastructures with programmable stiffness.

关键词： Natural structural vibration Origami design Group theory Symmetric substructuring method(SSM) Generalized eigenvalue analysis

基于5G毫米波协作通信的小单元无线能量信标优化部署策略

在线全文

学校读者我要写书评

暂无评论

广西科学 2024年第2期31卷 302-310页

作者：卢明妤李陶深吕品广西大学计算机与电子信息学院广西南宁530004 南宁学院信息工程学院广西南宁530200 广西医科大学基础医学院广西南宁530021

为实现第五代移动通信(5G)无线网络中高频谱效率与低能耗的绿色通信目的,本文研究了基于毫米波(mmWave)协作通信小单元下无线能量信标(Power Beacons,PB)的优化部署策略。该策略构建了一个高低频混合组网的能量受限型用户设备(User Equi... 详细信息

为实现第五代移动通信(5G)无线网络中高频谱效率与低能耗的绿色通信目的,本文研究了基于毫米波(mmWave)协作通信小单元下无线能量信标(Power Beacons,PB)的优化部署策略。该策略构建了一个高低频混合组网的能量受限型用户设备(User Equipment Devices,UE)毫米波协作通信的小单元网络模型,通过设计一个“需求-选择-建链”模式的新型建链协议,将通信毫米波定向传输技术应用于该建链过程中。在此模型基础上,以提高边缘系统频谱效率和能量收集覆盖率为目标,通过最小化固定充电的能量信标数量,在实现系统能耗最小化问题基础上保证系统的正常运行。针对该最优化问题是一个混合整数规划的多项式复杂程度的非确定性(Non-deterministic Polynomial Hard,NP-难)问题,设计一个具有常数因子的贪心算法近似求解优化问题。理论分析证明了该算法的可行性。仿真结果表明,本研究提出的优化部署策略能有效优化能量信标部署,在同等覆盖率与区域频谱效率增益下能耗最低。

关键词：无线携能通信移动边缘计算设备间通信任务卸载功率分配

无线携能通信下mmWave协作通信小单元的能效最优策略

在线全文

学校读者我要写书评

暂无评论

计算机工程与科学 2024年第4期46卷 626-634页

作者：卢明妤李陶深吕品广西大学计算机与电子信息学院广西南宁530004 南宁学院信息工程学院广西南宁530200 广西医科大学基础医学院广西南宁530021

针对无线携能通信(SWIPT)网络中的能量与信息同时传输阶段的优化问题,以最大化链路能量效率为目标,提出一种SWIPT下mmWave协作通信小单元的能效最优策略。该策略在最小链路传输速率和最小收集能量的联合约束下,在能量受限型用户设备的... 详细信息

针对无线携能通信(SWIPT)网络中的能量与信息同时传输阶段的优化问题,以最大化链路能量效率为目标,提出一种SWIPT下mmWave协作通信小单元的能效最优策略。该策略在最小链路传输速率和最小收集能量的联合约束下,在能量受限型用户设备的接收端采用功率分流工作模式,通过优化发射功率控制和功率分流因子,最大化系统链路能量效率。针对原问题是一个非凸的分式规划问题,具有NP难性质,采用Dinkelbach方法将目标函数转化为易于求解的凸优化问题,并设计一个交叉迭代的算法求出最优解。仿真实验结果表明,提出的策略在优化系统能量效率性能上要优于传统功率控制方法和最大发射功率法。

关键词：无线携能通信毫米波协作通信能量效率优化部署能量收集功率分流

维普期刊数据库博看期刊

THREE-DIMENSIONAL MODELING FOR THIN PLATE-LIKE STRUCTURES INCluDING SURFACE EFFECTS BY USING STATE SPACE METHOD

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Solida Sinica 2010年第3期23卷 260-270页

作者： Hongyu Sheng pin lu Institute of Civil Engineering Hefei University of Technology Hefei 230009 China Institute of Materials Research and Engineering A ^＊STAR (Agency for Science Technology and Research) 3 Research Link Singapore 117602

A three-dimensional （3-D） approach based on the state space method is proposed to study size-dependent mechanical properties of ultra-thin plate-like elastic structures considering surface effects. The structure is modeled as a laminate composed of a bulk bounded with upper and bottom surface layers, which are allowed to have different material properties from the bulk layer. State equations, including the surface properties of the structure, can be established on the basis of 3-D fundamental elasticity to analyze the size-dependent static characteristics of the thin plate-like structure. Compared with two-dimensional plate theories based size-dependent models for thin film structures in literature, the present 3-D approach is exact, which can provide benchmark results to assess the accuracy of 2-D plate theories and various numerical approaches. To show the feasibility of the proposed approach, a 3-D analytical solution for a simply supported plate-like thin structure including surface layers is derived. An algorithm is proposed for the calculation of the state equations obtained to ensure that the numerical results can reveal the surface effects clearly even for extremely thin surface layers. Numerical examples are carried out to exhibit the surface effects and some discussions are provided based on the results obtained.

关键词： micro-structures surface effects size-dependence state equation three-dimensional modeling

FURTHER STUDIES ON STROH-TYPE FORMALISMS FOR ANISOTROPIC PLATES WITH BENDING-EXTENSION COUPLING

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Solida Sinica 2007年第4期20卷 324-332页

作者： pin lu HaiBo Chen CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern Mechanics University of Science and Technology of China Hefei 230027 China Institute of High Performance Computing 1 SciencePark Road #01-01 The Capricorn Science Park II Singapore 117528

Stroh-type formalisms for anisotropic thin plates in literature axe reviewed and discussed, and two kinds of hybrid Stroh-type formalisms axe compared. It is seen that the two Stroh-type formalisms are essentially equivalent. With simple transfer relations, they can be expressed each other. In addition, with properly defined notation systems, the two Stroh-type formalisms can also be written in unified forms, which will be convenient in applications.

关键词： Stroh formalism anisotropic plate Stroh-type formalism composite laminates

基于专利的元宇宙技术发展现状及竞争态势分析

在线全文

学校读者我要写书评

暂无评论

大学图书情报学刊 2024年第2期42卷 59-65页

作者：吕品张璐瑶温州大学体育与健康学院 325035

文章以德温特专利数据作为分析数据源,从技术生命周期、热点技术、核心技术三个方面对元宇宙技术发展现状进行阐述,对比分析主要竞争国家专利申请数量和专利布局、研发主体专利申请数量及综合竞争地位,并根据研究结论就我国如何发展元... 详细信息

文章以德温特专利数据作为分析数据源,从技术生命周期、热点技术、核心技术三个方面对元宇宙技术发展现状进行阐述,对比分析主要竞争国家专利申请数量和专利布局、研发主体专利申请数量及综合竞争地位,并根据研究结论就我国如何发展元宇宙技术提出对策建议。研究结果显示:目前元宇宙技术发展处于快速成长期;热点技术包括数据处理及数据识别类、信息通信类和系统及装置类等;核心技术包括虚拟现实、增强现实、游戏、三维及信息系统等;我国属于技术活跃者,专利活动最高,专利质量不及美国和日本,核心专利申请数量较少,同时专利国际范围较小。分析元宇宙技术发展现状及竞争态势对于国家制定相关产业政策及相关企业进行专利布局具有重要意义。

关键词：元宇宙专利分析技术发展现状竞争态势