检索结果-南通市图书馆

microstructural evolution of mg-7Al-2Sn mg alloy during multi-directional impact forging

在线全文

学校读者我要写书评

暂无评论

Journal of magnesium and Alloys 2015年第3期3卷 180-187页

作者： m.g.jiang H.Yan L.gao R.S.Chen The group of magnesium Alloys and Their Applications Institute of Metal ResearchChinese Academy of Sciences62 Wencui RoadShenyang 110016China University of Chinese Academy of Sciences 19 Yuquan RoadBeijing 100049China general motors China Science Lab 56 Jinwan RoadPudongShanghai 201206China

multi-directional impact forging(mDIF)was applied to a mg-7Al-2Sn(wt.%)mg alloy to investigate its effect on the microstructural *** process exhibited high grain refinement *** mDIF 200 passes,the grain size drastically decreased to 20µm from the initial coarse grains of~500µm due to dynamic recrystallization(DRX).meanwhile,original grain boundaries remained during mDIF and large numbers of fine sphericalβ-mg_(17)Al_(12) particles dynamically precipitated along the original grain boundaries with high Al concentration,acting as effective pinning obstacles for the suppression of DRXed grain ***,micro-cracks nucleated during mDIF and propagated along the interface between the remained globular or cubic Al-mn particles and mg matrix.

关键词： magnesium alloy Forging grain refinement Dynamic precipitation

Quasi-in-situ observing the rare earth texture evolution in an extruded mg-Zn-gd alloy with bimodal microstructure

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

Journal of magnesium and Alloys 2021年第5期9卷 1818-1827页

作者： m.g.jiang C.Xu H.Yan T.Nakata Z.W.Chen C.S.Lao R.S.Chen S.Kamado E.H.Han College of mechatronics and Control Engineering Shenzhen University3688 Nanhai AveShenzhen 518060China The group of magnesium Alloys and Their Applications Institute of Metal ResearchChinese Academy of Sciences62 Wencui RoadShenyang 110016China School of materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China Department of mechanical Engineering Nagaoka University of TechnologyNagaoka 940-2188Japan

The static recrystallization and associated texture evolution were investigated in an extruded mg-Zn-gd alloy with bimodal microstructure based on a quasi-in-situ electron back-scatter diffraction(EBSD)*** typical rare earth(RE)texture formed during annealing,evolving from the bimodal microstructure with[1010]basal fiber texture that consisted of fine recrystallized(RXed)grains and coarse unrecrystallized(un RXed)grains elongated along the extrusion *** both RXed and un RXed regions,the RXed nucleation produced randomized orientations without preferred selection and the RXed grains with RE texture orientation had more intensive growth ability than those with basal fiber orientation,thereby leading to the preferred selection of RE texture orientation during grain *** relationships between stored strain energy,solute drag,grain growth and texture evolution are discussed in *** study provided direct evidence of the RE texture evolution in an extruded mg-RE alloy,which assists in understanding the formation mechanisms for RE texture during extrusion and better developing wrought mg alloys with improved formability.

关键词： magnesium alloy Rare earth texture Extrusion Annealing Recrystallization

Ultra‑High Sensitivity Anisotropic Piezoelectric Sensors for Structural Health monitoring and Robotic Perception

在线全文

学校读者我要写书评

暂无评论

Nano-micro Letters 2025年第2期17卷 432-446页

作者： Hao Yin Yanting Li Zhiying Tian Qichao Li Chenhui jiang Enfu Liang Yiping guo State Key Laboratory of metal matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240People’s Republic of China Beijing Vacuum Electronics Research Institute Beijing 100015People’s Republic of China Fundamental Science On Vibration Shock and Noise LaboratoryState Key Laboratory of Mechanical System and VibrationSchool of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240People’s Republic of China

monitoring minuscule mechanical signals,both in magnitude and direction,is imperative in many application scenarios,e.g.,structural health monitoring and robotic sensing ***,the piezoelectric sensor struggles to satisfy the requirements for directional recognition due to the limited piezoelectric coefficient matrix,and achieving sensitivity for detecting micrometer-scale deformations is also ***,we develop a vector sensor composed of lead zirconate titanate-electronic grade glass fiber composite filaments with oriented arrangement,capable of detecting minute anisotropic *** as-prepared vector sensor can identify the deformation directions even when subjected to an unprecedented nominal strain of 0.06%,thereby enabling its utility in accurately discerning the 5μm-height wrinkles in thin films and in monitoring human pulse *** ultra-high sensitivity is attributed to the formation of porous ferroelectret and the efficient load transfer efficiency of continuous lead zirconate titanate ***,when integrated with machine learning techniques,the sensor’s capability to recognize multi-signals enables it to differentiate between 10 types of fine textures with 100%*** structural design in piezoelectric devices enables a more comprehensive perception of mechanical stimuli,offering a novel perspective for enhancing recognition accuracy.

关键词： Flexible piezoelectric filaments Anisotropic Ultra-high sensitivity Structural health detection Texture recognition

Advanced Functional Electromagnetic Shielding materials:A Review Based on micro‑Nano Structure Interface Control of Biomass Cell Walls

在线全文

学校读者我要写书评

暂无评论

Nano-micro Letters 2025年第1期17卷 98-134页

作者： Yang Shi mingjun Wu Shengbo ge Jianzhang Li Anoud Saud Alshammari Jing Luo mohammed A.Amin Hua Qiu Jinxuan jiang Yazeed m.Asiri Runzhou Huang Hua Hou Zeinhom m.El‑Bahy Zhanhu guo Chong Jia Kaimeng Xu Xiangmeng Chen Co‑Innovation Center of Efficient Processing and Utilization of Forest Resources College of Materials Science and EngineeringNanjing Forestry UniversityNanjing 210037People’s Republic of China State Key Laboratory of Efficient Production of Forest Resourced Beijing Forestry UniversityQinghua East Road 35Haidian DistrictBeijing 100083People’s Republic of China Department of Physics Faculty of Sciences‑ArarNorthern Border UniversityArar 91431Saudi Arabia Department of Chemistry College of ScienceTaif UniversityP.O.Box 1109921944 TaifSaudi Arabia Shaanxi Key Laboratory of macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’anShaanxi 710072People’s Republic of China Integrated Composites Lab Department of Mechanical and Construction EngineeringNorthumbria UniversityNewcastle Upon Tyne NE18STUK College of materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024People’s Republic of China Department of Chemistry Faculty of ScienceAl-Azhar UniversityNasr CityCairo 11884Egypt Yunnan Provincial Key Laboratory of Wood Adhesives and glued Products International Joint Research Center for Biomass MaterialsSouthwest Forestry UniversityKunming 650224People’s Republic of China School of Science Henan Agricultural UniversityZhengzhou 450002People’s Republic of China

Research efforts on electromagnetic interference(EmI)shielding materials have begun to converge on green and sustainable biomass *** materials offer numerous advantages such as being lightweight,porous,and *** to their porous nature,interfacial compatibility,and electrical conductivity,biomass materials hold significant potential as EmI shielding *** concerted efforts on the EmI shielding of biomass materials have been reported,this research area is still relatively new compared to traditional EmI shielding *** particular,a more comprehensive study and summary of the factors influencing biomass EmI shielding materials including the pore structure adjustment,preparation process,and micro-control would be *** preparation methods and characteristics of wood,bamboo,cellulose and lignin in EmI shielding field are critically discussed in this paper,and similar biomass EmI materials are summarized and *** composite methods and fillers of various biomass materials were *** paper also highlights the mechanism of EmI shielding as well as existing prospects and challenges for development trends in this field.

关键词： Biomass materials Electromagnetic interference shielding micro-nano structure interface control Conductivity

Preparation of Co/S co-doped carbon catalysts for excellent methylene blue degradation

在线全文

学校读者我要写书评

暂无评论

International Journal of minerals,metallurgy and materials 2025年第1期32卷 169-181页

作者： Haixu Li Haobo He Tiannan jiang Yunfei Du Zhichen Wu Liang Xu Xinjie Wang Xiaoguang Liu Wanhua Yu Wendong Xue School of materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Beijing Jinyu Tongda Refractory Technologies Co. Ltd.Beijing 100085China

S and Co co-doped carbon catalysts were prepared via pyrolysis of mOF-71 and thiourea mixtures at 800℃at a mass ratio of mOF-71 to thiourea of 1:0.1 to effectively activate peroxymonosulfate(PmS)for methylene blue(mB)*** effects of two different mixing routes were identified on the mB degradation ***,the catalyst obtained by the alcohol solvent evaporation(mOF-AEP)mixing route could degrade 95.60%mB(50 mg/L)within 4 min(degradation rate:K=0.78 min^(-1)),which was faster than that derived from the direct grinding method(mOF-DgP,80.97%,K=0.39 min^(-1)).X-ray photoelectron spectroscopy revealed that the Co-S content of mOF-AEP(43.39at%)was less than that of mOF-DgP(54.73at%),and the proportion of C-S-C in mOF-AEP(13.56at%)was higher than that of mOF-DgP(10.67at%).Density functional theory calculations revealed that the adsorption energy of Co for PmS was -2.94 eV when sulfur was doped as C-S-C on the carbon skeleton,which was higher than that when sulfur was doped next to cobalt in the form of Co-S bond(-2.86 eV).Thus,the C-S-C sites might provide more contributions to activate PmS compared with ***,the degradation parameters,including pH and mOF-AEP dosage,were ***,radical quenching experiments and electron paramagnetic resonance(EPR)measurements revealed that ^(1)O_(2)might be the primary catalytic species,whereas·O~(2-)might be the secondary one in degrading mB.

关键词： advanced oxidation process alcohol solvent evaporation hydrogen bond S and Co co-doped carbon catalysts wastewater remediation

基于2018-2022年国家自然科学基金结题项目分析干细胞研究现状

在线全文

学校读者我要写书评

暂无评论

中国组织工程研究 2025年第19期29卷 4145-4150页

作者：蒋君张玢中国医学科学院医学信息研究所北京市100005

背景:目前大多数研究从国家自然科学基金资助论文和项目申请角度出发,对干细胞某一方面进行深入分析,或者验证某种评价方法,缺乏对干细胞领域国家自然科学基金已结题项目的全面分析。目的:了解2018-2022年干细胞领域国家自然科学基金结... 详细信息

背景:目前大多数研究从国家自然科学基金资助论文和项目申请角度出发,对干细胞某一方面进行深入分析,或者验证某种评价方法,缺乏对干细胞领域国家自然科学基金已结题项目的全面分析。目的:了解2018-2022年干细胞领域国家自然科学基金结题项目资助情况及研究热点,为后续研究提供参考。

关键词：干细胞国家自然科学基金聚类分析研究热点文献计量学

STUDY ON gRANULATION mECHANISmS OF γ+(Fe,mn)3C EUTECTICS IN AUSTENITE STEEL COmPOSITES

在线全文

学校读者我要写书评

暂无评论

Acta metallurgica Sinica(English Letters) 2003年第6期16卷 449-456页

作者： g.F.Liang Z.m.Xu Q.C.jiang J.g.Li SchoolofmaterialsScienceandTechnology ShanghaiJiaotongUniversityShanghai200030China SchoolofmaterialsScience JilinUniversityChangchun130025China

Results presented in this paper contribute to investigation of the granulation mechanisms of γ+(Fe,mn)3C eutectics in the austenite matrix composites (abbreviated EAmC). The specimens corresponding to the nominal composition of eutectic with controlled RE(Ce)-mg agent modifier additions have been unidirectional solidified with a constant growth rate of 2.18μm/s at a fixed temperature gradient of 800K/cm using vertical Bridgeman method. With the RE-mg agent modifier, the transition of solid/liquid (S/L) interface from columnar to dendrite (CDT), refinement and developed branching of γ and (Fe,mn)3C phases in the eutectics, and the transition of growth style from faceted-nonfaceted (F/NF) to nonfaceted-nonfaceted (NF/NF) for γ and (Fe,mn)3C phases in the eutectic have been observed and investigated theoretically. Those can explain the granulation of γ+(Fe,mn)3C eutectics in the as cast because the roundness increases with the developed lateral branching of primary austenite dendrites, refinement of eutectics, and NF/NF growth of γ and (Fe,mn)3C phases in the eutectic.

关键词： composite RE-mg agent granulation unidirectional solidifica-tion

DEPENDENCE OF mICROSTRUCTURE SCALES OF EUTECTICS ON Ca-Si mODIFIER AmOUNT IN AUSTENITE STEEL COmPOSITES

在线全文

学校读者我要写书评

暂无评论

Acta metallurgica Sinica(English Letters) 2004年第5期17卷 651-654页

作者： g.F.Liang Z.m.Xu Q.C.jiang J.g.Li SchoolofmaterialsScienceandTechnology ShanghaiJiaotongUniversityShanghai200030China SchoolofEnvironmentalScienceandEngineeringJiaotongUniversity Shanghai200030China SchoolofmaterialsScience JilinUniversityChangchun130025China

Results presented in this paper contribute to investigation of the effect of the added Ca-Si modifier amount ( ) on the microstructure scales of granular γ-(Fe,mn)3C eutectics such as the volume fraction (f) and diameter (d) in the austenite steel matrix composites (EAmC). Directional solidification of EAmC has been carried out using vertical Bridgman method at 50.6μms-1 with a constant temperature gradient about 800Kcm-1. The higher constitutional supercooling ahead of solid-liquid interface attributing to the larger results in the enlargement of γ-(Fe,mn)3C coupled-zone and the increment of the nucleation rate of eutectics. Therefore, f increases with increasing . The branches of the primary austenite dendrites develop more greatly as increases, which limits the growth of eutectics. As a result, d decreases with increasing .

关键词： austenite steel eutectic microstructure directional solidification

单宁酸改性互穿网络水凝胶促进断裂跟腱术后的组织重塑

在线全文

学校读者我要写书评

暂无评论

中国组织工程研究 2025年第4期29卷 721-729页

作者：张博张振江东北京大学第三医院运动医学科北京市100191

背景:跟腱断裂术后的再生与重塑是临床治疗的难点,组织工程水凝胶材料为促进跟腱修复提供了可能。目的:探究单宁酸改性互穿网络水凝胶对大鼠断裂跟腱组织再生与重塑的作用。方法:①通过蓝光照射及CaSO4溶液浸泡交联制备单宁酸改性互穿... 详细信息

背景:跟腱断裂术后的再生与重塑是临床治疗的难点,组织工程水凝胶材料为促进跟腱修复提供了可能。目的:探究单宁酸改性互穿网络水凝胶对大鼠断裂跟腱组织再生与重塑的作用。方法:①通过蓝光照射及CaSO4溶液浸泡交联制备单宁酸改性互穿网络水凝胶,表征水凝胶的微观形貌、力学性能、黏附性能、体外释药性能与生物相容性。②取30只SD大鼠,采用随机数字表法分为假手术组、手术组与水凝胶组,每组10只,后2组建立右后肢跟腱断裂模型,手术组采用改良Kessler法将断裂跟腱重新缝合,水凝胶组采用相同术式缝合断裂跟腱后将单宁酸改性互穿网络水凝胶贴片完全缠绕包裹于断端接合处。术后4周,对断裂跟腱进行影像学检查、组织学评价、生物力学测试及炎症因子水平检测。结果与结论:①扫描电镜下可见单宁酸改性互穿网络水凝胶呈多孔微观结构,孔径为3-10μm,并且水凝胶具备良好的体外释药性能、黏附强度与拉伸强度;CCK-8检测与活/死染色显示,该水凝胶对大鼠骨髓间充质干细胞增殖活性无明显影响,具备良好的生物相容性。②mRI成像显示,与手术组比较,水凝胶组大鼠跟腱呈均一低信号,跟腱前后径厚度减小,与周围组织分界更为明确,表现更接近假手术组。苏木精-伊红与masson染色显示,手术组大鼠跟腱纤维排列松散混乱,细胞密度增加且排布杂乱,伴有明显炎性细胞浸润,部分区域出现腱内骨化;水凝胶组大鼠跟腱纤维排列有序,细胞密度降低且排布规整,炎性细胞浸润明显减少。手术组大鼠跟腱的拉伸强度低于假手术组(PmRNA表达升高(PmRNA表达降低。③结果表明,单宁酸改性互穿网络水凝胶可显著抑制局部炎症反应、促进断裂跟腱组织重塑。

关键词：单宁酸水凝胶互穿网络跟腱断裂组织重塑组织再生