检索结果-南通市图书馆

Acta Metallurgica Sinica(English Letters) 2023年第2期36卷 295-309页

作者： Yu-Jin Nie jian-Wei Dai Xiao-Bo zhang School of Materials Science and Engineering Nanjing Institute of TechnologyNanjing211167China jiangsu Key Laboratory of Advanced Structural Materials and Application Technology Nanjing211167China

The as-extruded Mg-3Nd-0.2Zn-0.4Zr-xAg(x=0,0.2,0.5,1 wt%)alloys were prepared for biomedical *** electron microscope,electron backscattered diffraction,X-ray diffraction,tensile test machine,electrochemical workstation,and immersion experiments were used to study microstructures,mechanical properties,and corrosion behavior of the as-extruded *** results indicate that the microstructures of all the as-extruded alloys are composed of coarse undynamic recrystallized grains,fine equiaxed recrystallized grains,and precipitated *** element plays a positive role in promoting dynamic recrystallization and grain *** during the extrusion,all the four alloys generate a //ED fiber *** the increase of Ag element,the volume fraction of Mg_(12)Nd phase increases and then decreases *** increasing Ag addition,both yield strength and ultimate tensile strength of the as-extruded alloys reduce first and then improve,and the elongation improves gradually from 9.4 to 12.7%.More importantly,the addition of Ag accelerates corrosion of the as-extruded alloys in simulated body fluid,and all the as-extruded alloys show uniform corrosion mode.

关键词： Magnesium alloy Hot extrusion Mechanical properties Corrosion resistance

基于创新工作室的“大思政”育人途径探索与实践

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

教育教学论坛 2024年第14期 113-116页

作者：鲍雅静张萌金华李贺大连民族大学环境与资源学院辽宁大连116600

高等教育作为育人途径中的重要组成部分,在学生读书期间起到的作用不可替代。近些年来,随着社会的进步与发展,“育才先育人,育人先育德”的观念深入人心。我国许多高校也在尝试进行教育教学体制改革以巩固德育的重要地位,然而存在改良... 详细信息

高等教育作为育人途径中的重要组成部分,在学生读书期间起到的作用不可替代。近些年来,随着社会的进步与发展,“育才先育人,育人先育德”的观念深入人心。我国许多高校也在尝试进行教育教学体制改革以巩固德育的重要地位,然而存在改良效果差、运行效率低等问题。为更好地将立德树人根本任务落到实处,以大学生创新工作室为平台,通过挖掘思政元素探讨创新型教育教学与思政教育的有机结合方式,总结基于创新工作室的民族院校“大思政”育人对策性措施和途径,旨在培养真正德才兼备的优质人才。

关键词：大学生创新工作室民族院校思政教育

Spatial variability effect of internal friction angle on the post-failure behavior of landslides using a random and non-Newtonian fluid based SPH method

在线全文

学校读者我要写书评

暂无评论

Geoscience Frontiers 2020年第4期11卷 1107-1121页

作者： Weijie zhang jian Ji Yufeng Gao Xiaoyu Li Chunshun zhang Key Lab of Ministry of Education for Geomechanics and Embankment Engineering Hohai UniversityNanjing210098China Department of Civil Engineering Monash UniversityClayton3168Australia

This study proposed a random Smoothed Particle Hydrodynamics method for analyzing the post-failure behavior of landslides,which is based on the Karhunen-Loeve(K-L) expansion,the non-Newtonian fluid model,and the OpenMP parallel ***,the applicability of this method was validated by comparing the generated random field with theoretical result and by simulating the post-failure process of an actual ***,an illustrative landslide example was created and simulated to obtain the spatial variability effect of internal friction angle on the post-failure behavior of landslides under different coefficients of variation(COVs) and correlation lengths(CLs).As a conclusion,the reinforcement with materials of a larger friction angle can reduce the runout distance and impact the force of a *** the increase of COV,the distribution range of influence zones also increases,which indicates that the deviation of influence zones becomes *** addition,the correlation length in Monte Carlo simulations should not be too small,otherwise the variation range of influence zones will be underestimated.

关键词： Landslides Spatial variability Random field Smoothed particle hydrodynamics Monte Carlo simulation Post-failure behavior

Optical spectra of Eu^(2+) ion doped KMgF_3 single crystals grown by Bridgman method

在线全文

学校读者我要写书评

暂无评论

Optoelectronics Letters 2019年第1期15卷 26-30页

作者： SHI Xu-dong XIA Hai-ping HU jian-xu zhang jian-li ZHU Yong-sheng CHEN bao-jiu Key Laboratory of Photo-electronic Materials Ningbo University College of Physics and Electronic Engineering College of Chemistry and Pharmaceutical Engineering Nanyang Normal University Department of Physics Dalian Maritime University

High-quality KMgF_3 single crystal containing 0.5 mol% europium (Eu) was prepared by an improved Bridgman method.X-ray diffraction(XRD),photoluminescence spectra and fluorescence lifetime were *** results indicate the reduction of Eu^(3+)to Eu^(2+)in the KMgF_3 single *** the excitation of 259 nm,370 nm and 394 nm,the sample has two distinct emissions of Eu^(2+):4f^7→4f^7(～363 nm)and 4f^65d^1→4f^7(～440 nm).The substitution site for Eu ion is *** optical property investigation result shows that the Eu^(2+)doped KMgF_3 single crystal may be used as potential laser media and related materials for optical devices.

关键词： crystals Bridgman method investigation

纳滤膜对不同水源中无机物处理效果及膜污染特性分析

在线全文

学校读者我要写书评

暂无评论

应用化工 2024年第2期53卷 297-301页

作者：张百强陈发明糜自栋孙韶华宋武昌刘建广贾瑞宝山东建筑大学市政与环境工程学院山东济南250101 山东省城市供排水水质监测中心山东济南250014

针对不同水源地(引黄水库、微污染湖泊、河流)水质差异问题,分别选取了不同典型水体(鹊山水库、南阳湖和沂河)开展纳滤实验,探究了NF1、NF2两种纳滤膜对不同水源中无机污染物的去除效能与膜污染情况。结果表明,3种原水经过预处理和纳滤... 详细信息

针对不同水源地(引黄水库、微污染湖泊、河流)水质差异问题,分别选取了不同典型水体(鹊山水库、南阳湖和沂河)开展纳滤实验,探究了NF1、NF2两种纳滤膜对不同水源中无机污染物的去除效能与膜污染情况。结果表明,3种原水经过预处理和纳滤处理后pH值略有下降,浊度均在0.186 NTU之下,总硬度、溶解性总固体(TDS)的含量均较低。NF1和NF2对一价离子平均去除率分别达到92.35%,42.35%以上,对二价离子的平均去除率分别可达97.87%,85.67%以上;NF2在处理南阳湖原水后,无机污染情况较为严重;酸碱联合冲洗对污染膜的修复效果更好。

关键词：纳滤无机物去除率膜污染

Promoted Li+ conduction in PEO-based all-solid-state electrolyte by hydroxyl-modified glass fiber fillers

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2023年第3期42卷 875-884页

作者： Xin Wang Xiu Shen Peng zhang Ai-Jun Zhou Jin-bao Zhao Yangtze Delta Region Institute(Huzhou) University of Electronic Science and Technology of ChinaHuzhou 313001China State Key Laboratory of Physical Chemistry of Solid Surfaces Collaborative Innovation Centre of Chemistry for Energy MaterialsState-Province Joint Engineering Laboratory of Power Source Technology for New Energy VehicleEngineering Research Center of Electrochemical TechnologyMinistry of EducationCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China College of Energy and School of Energy Research Xiamen UniversityXiamen 361102China School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731China

In the polyoxyethylene(PEO)-based solid-state electrolytes,the low ionic conductivity of lithium ions limits its application in solid-state lithium batteries,so optimizing the conduction path of lithium ions is beneficial to improve the ionic *** this work,we report the use of hydrothermal carbon nano-sphere(HCS)modified glass fibers(GF)as a functional filler(GF@HCS)to improve the ionic conductivity of PEO composite solidstate *** oxygen atoms in the hydroxyl groups on the surface of HCS can be complexed with Li ions as its transport sites,which means that it can promote the longdistance transport of Li ions along the glass fiber *** addition of 2 wt%GF@HCS fillers,the degree of crystallinity of PEO composite solid-state electrolyte is the smallest,and the ionic conductivity is significantly increased from 8.9×10^(-5) to 4.4×10^(-4) S·cm^(-1) at 60℃.Moreover,the PEO composite solid-state electrolyte exhibits better lithium-metal interface stability in symmetric lithium batteries and superior rate performance in LiFePO4 solid-state batteries.

关键词： Filler modification Hydrothermal carbon spheres Transport channel Polyoxyethylene(PEO)composite electrolyte All-solid-state battery

Parameterization of the sea spray generation function with whitecap coverage

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2020年第8期39卷 24-33页

作者： jian Shi Wenjing zhang Xueyan zhang Jingdong Liu Zhenyu Liu College of Meteorology and Oceanography National University of Defense TechnologyNanjing 211101China Unit 91604 of the Chinese People’s Liberation Army Longkou 265700China

Sea spray droplets are produced by waves breaking on the sea surface, and they vary the transfer of energy between the atmosphere and ocean. The sea spray generation function(SSGF) is generally considered as a function of the initial radius of the spray droplets and the wind speed. However, ocean waves always exist at the air-sea interface, so it is not reasonable to consider only the effect of sea surface winds while ignoring the effects of ocean waves. Whitecap coverage is an important characteristic parameter of breaking waves, and researchers believe that this parameter is related to both wave state and wind speed. In this paper, the SSGF is parameterized by the whitecap coverage, and a new SSGF describing different droplet radii is organically integrated based on the whitecap coverage parameter. Then, with the relationship between the whitecap coverage and wave state, the influence of ocean waves on the SSGF for different wave states was analyzed by using observational data in the laboratory. The results show that the new SSGF that considers wave effects can reasonably describe the droplet generation process under different wave state conditions.

关键词： sea spray generation function whitecap coverage wave state

Chemical synthesis and characterization of SmCo_(5)/Co magnetic nanocomposite particles

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2021年第5期40卷 1224-1231页

作者： Ying Dong Tian-Li zhang Hui Wang Xin Liu Cheng-bao jiang School of Materials Science and Engineering Beihang UniversityBeijing 100191China

Magnetic nanocomposite material has been widely focused for the potential to become the next generation of magnetic *** this paper,two kinds of chemical coating methods were used to prepare SmCo_(5)/Co nanocomposite particles which were further characterized and *** two methods were carried out by using different materials and at different *** Method I,oleylamine(OAm),oleic acid and Ca(acac)2 were used and the reaction was carried out at the temperature of 300℃.In MethodⅡ,anhydrous isopropanol,polyvinylpyrrolidone(PVP),N_(2)H_(4)·H_(2)O and CoCl_(2)·6 H_(2)O were used and the reaction temperature was~55℃.It was found that by using the two methods,the growth and the crystal structure of the Co nanoparticles(NPs)are *** Method I,epitaxial growth on the surface of SmCo_(5) NPs was observed and the Co NPs were in a facecentered close packing crystal *** in Method II,the coated Co NPs were self-nucleated with a crystal structure of hexagonal close *** MethodⅡwith the addition of surfactant,anisotropic nanocomposite particles were achieved with an enhanced saturated magnetization of 84.2 A·m^(2)·kg^(-1).And the coercivity change of the NPs illustrates that a nonmagnetic interlayer between the hard and soft magnetic phase is beneficial to maintain the coercivity.

关键词： Nanocomposite particles Chemical coating Core/shell Magnetic properties Rare-earth material

乳酸诱导的脊髓神经元线粒体分裂在小鼠糖尿病神经病理性痛中的作用

在线全文

学校读者我要写书评

暂无评论

中华麻醉学杂志 2024年第5期44卷 603-608页

作者：潘文燕贺俭王福宇卢冠华何万友张磊张创强王汉兵广东医科大学第一临床医学院湛江524000 佛山市第一人民医院麻醉科佛山528000

目的评价乳酸诱导的脊髓神经元线粒体分裂在小鼠糖尿病神经病理性痛(DNP)中的作用。方法选择SPF级健康成年雄性C57BL/6小鼠36只,2月龄,体质量20~25 g,采用随机数字表法分为3组(n=12):对照组(C组)、DNP组和DNP+草氨酸钠组(OXA组)。采用... 详细信息

目的评价乳酸诱导的脊髓神经元线粒体分裂在小鼠糖尿病神经病理性痛(DNP)中的作用。方法选择SPF级健康成年雄性C57BL/6小鼠36只,2月龄,体质量20~25 g,采用随机数字表法分为3组(n=12):对照组(C组)、DNP组和DNP+草氨酸钠组(OXA组)。采用腹腔注射链脲佐菌素130 mg/kg构建糖尿病模型。糖尿病建模成功后,OXA组腹腔注射草氨酸钠750 mg/kg,1次/d,持续4周,抑制乳酸生成;C组和DNP组于相同时点腹腔注射等容量生理盐水。于造模前、造模后1、2、3和4周时测定左侧后足机械缩足阈值(MWT)。最后一次行为学测试完成后,取血标本和L4-6段脊髓组织,采用比色法检测血清和脊髓组织乳酸水平,分别采用JC-1和DHE探针检测线粒体膜电位和ROS含量,采用Western blot法检测线粒体动力相关蛋白1(Drp1)和线粒体融合蛋白2(Mfn2)的表达,透射电镜观察线粒体的结构和数量,采用免疫荧光双标观察Drp1与神经元标志物NeuN共表达情况。结果与C组比较,DNP组和OXA组造模后MWT降低,血清和脊髓组织乳酸水平、脊髓ROS含量升高,线粒体膜电位下降,Drp1表达上调,Mfn2表达下调,线粒体数量增多,面积减小(P<0.05),Drp1和NeuN共表达增加;与DNP组比较,OXA组造模后MWT升高,血清和脊髓组织乳酸水平、脊髓ROS含量降低,线粒体膜电位升高,Drp1表达下调,Mfn2表达上调,线粒体数量减少,面积增大(P<0.05),Drp1和NeuN共表达减少。结论乳酸诱导的脊髓神经元线粒体过度分裂可导致线粒体功能障碍,可能参与小鼠DNP的维持机制。

关键词：糖尿病神经病变乳酸线粒体

新型电力系统环境下煤电与新能源等多元资源协调优化运行及其挑战

在线全文

学校读者我要写书评

暂无评论

电网技术 2024年第8期48卷 3105-3113,I0004,I0005页

作者：孙大雁耿建杨胜春张粒子杨军峰乌晓江牟树君史磊夏秋国家电网有限公司国家电力调度控制中心北京市西城区100031 中国电力科学研究院有限公司江苏省南京市210003 华北电力大学电气与电子工程学院北京市昌平区102206 上海交通大学机械与动力工程学院上海市闵行区200000 北京低碳清洁能源研究院北京市昌平区102211 国网宁夏电力有限公司宁夏回族自治区银川市750000

我国新能源装机规模最大、且持续高速发展,电网运行面临新能源消纳与电力保障供应的双重挑战,需多方位提升系统灵活性,构建新型供给消纳体系,促进资源优化配置。立足我国电源结构和新能源快速发展态势,提出和分析了五大关键技术:煤电与... 详细信息

我国新能源装机规模最大、且持续高速发展,电网运行面临新能源消纳与电力保障供应的双重挑战,需多方位提升系统灵活性,构建新型供给消纳体系,促进资源优化配置。立足我国电源结构和新能源快速发展态势,提出和分析了五大关键技术:煤电与新能源灵活性运行能力提升技术、柔性电-氢-化系统集成设计与运行控制优化技术、多资源互补优化调度运行技术、容量和新型辅助服务市场机制及出清技术、煤电与新能源综合调节和优化运行系统应用技术,促进煤电与新能源的协调发展,推动构建适应我国国情的新能源供给消纳体系建设,推动电力系统的转型升级。

关键词：新型电力系统多元灵活资源优化调度灵活调节能力