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Microstructure and mechanical properties of(TiZrNbTaMo)C high-entropy ceramic

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Journal of Materials Science & Technology 2020年第4期39卷 99-105页

作者： Kai wang Lei Chen Chenguang Xu Wen Zhang Zhanguo Liu yujin wang Jiahu Ouyang Xinghong Zhang Yudong Fu Yu Zhou School of Materials Science and Engineering Harbin Institute of TechnologyHarbin150001China National Key Laboratory of Science and Technology on Advanced Composites in Special Environment Harbin Institute of TechnologyHarbin150001China Key Laboratory of Advanced Structural-Functional Integration Materials&Green Manufacturing Technology Harbin Institute of TechnologyHarbin150001China College of Materials Science and Engineering Harbin Engineering UniversityHarbin150001China

A high-entropy(Ti Zr Nb Ta Mo)C ceramic has been successfully fabricated by hot pressing the newlysynthesized quinary carbide powder to investigate its microstructure and mechanical *** carbothermal reduction process of equimolar quinary metallic oxides at 1500℃for 1 h generates a carbide powder mixture,which consists mainly of Ta C-and Zr C-based solid *** as-synthesized powder was then sintered to form a single-phase high-entropy ceramic by a two-step hot pressing at 1850℃for1 h and 2100℃for 0.5 h,*** high-entropy ceramic exhibits a fine grain size of about 8.8μm,a high compositional uniformity and a high relative density of 98.6%by adding Mo as the strategic main *** measured nanohardness values of(TiZrNbTaMo)C ceramic are 25.3 GPa at 9.8 N and 31.3 GPa at 100 m N,respectively,which are clearly higher than those of other available high-entropy carbide ceramics.

关键词： High-entropy ceramic (TiZrNbTaMo)C Microstructure Enhanced hardness

Preparation and Properties of Silver Colloids Produced by Laser-Induced Reduction of Silver Nitrate

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Chinese Physics Letters 1992年第2期9卷 73-76页

作者： LIANG Erjun wang Yuntao wang yujin HAO Qingxiu ZHANG Pengxiang Center of Analysis and Test Zhengzhou University Zhengzhou 450052 Institute of Physics Academia SinicaBeijing 100080

Silver colloids have been prapared by laser-induced reduction of silver *** of the colloids were studied with transmission electron microscopy,visible-ultraviolet absorption and Raman *** Rnd that the growth of the silver grains is dependent on the laser illumination *** characteristic absorption bands of the colloids are located near 390 and 560nm,*** only are the silver colloids much cleaner than those prepared by chemical reduction methods,but also surface enhanced Raman scattering *** method may be of interests for ultrafine particle studies as well.

关键词： spectroscopy silver absorption

Microstructure, mechanical and thermo-physical properties of hot-pressed Al2O3-GdAlO3-ZrO2 ceramics with eutectic composition

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Progress in Natural Science:Materials International 2017年第4期27卷 491-497页

作者： Abdelkhalek Henniche Jiahu Ouyang Yonghui Ma Zhigang wang Zhanguo Liu yujin wang Mehdi Derradji Xinyu Liu School of Materials Science and Engineering Harbin Institute of Technology Laboratoire Génie des Matériaux Ecole Militaire Polytechnique Institute of Composite Materials Key Laboratory of Superlight Material and Surface Technology of Ministry of Education College of Materials Science and Chemical Engineering Harbin Engineering University

A low cost chemical co-precipitation method was employed to fabricate nanoscale Al2O3-GdAlO3-ZrO2powder with eutectic composition. A careful control of reaction conditions was required during the preparation. The synthesized nanopowders exhibited a particle size of 20-200 nm, and were highly dispersive and uniform. The results showed that calcination temperature had an important influence on the phase constituents of the nanopowders. With increasing the calcination temperature, a phase transformation from θ-Al2O3to α-Al2O3and a thermal decomposition from Gd3Al5O12(GdAG) to GdAlO3and α-Al2O3occurred in sequence. A calcination temperature of 1300 ℃ was needed for the crystallization of α-Al2O3. These nanosized powders were consolidated via hot pressing to produce a fully densified ceramic composite with eutectic composition. The Al2O3-GdAlO3-ZrO2ceramic hot-pressed at 1500 ℃ exhibited a relative density of 99.4%, a flexural strength of 485 MPa and a fracture toughness of 6.5 MPa m1/2. The ceramic had a thermal conductivity of 1.9 W m K-1at 1200 ℃ and a thermal expansion coefficient of 9.49 ×10-6K-1at 1100 ℃.

关键词： Al2O3-GdAlO3-ZrO2 system Co-precipitation hot pressing Flexural strength thermal conductivity

Reactive sintering of dual-phase high-entropy ceramics with superior mechanical properties

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Journal of Materials Science & Technology 2022年第34期129卷 223-227页

作者： Sijia Huo Lei Chen Xinrui Liu Qingyi Kong yujin wang Hui Gu Yu Zhou Institute for Advanced Ceramics School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin 150080China Key Laboratory of Advanced Structure-Function Integrated Materials and Green Manufacturing TechnologyHarbin Institute of TechnologyHarbin 150001China Materials Genome Institute School of Materials Science and EngineeringShanghai UniversityShanghai 200444China

1. Introduction The requirements for the performance of materials have become increasingly stringent in recent years, with the rapid development of aerospace, machinery, metallurgy, nuclear energy,chemical industry, and military industry [1,2], and traditional single-phase materials are gradually revealing disadvantages due to the contradiction between demanding service environments and simple material design.

关键词： ceramics phase contradiction

Texture and anisotropy of hot-pressed h-BN matrix composite ceramics with in situ formed YAG

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Journal of Advanced Ceramics 2022年第4期11卷 532-544页

作者： Zhuo ZHANG Xiaoming DUAN Zhuo TIAN yujin wang Lan wang Lei CHEN Baofu QIU Delong CAI Peigang HE Dechang JIA Yu ZHOU Key Laboratory of Advanced Structural-Functional Integration Materials&Green Manufacturing Technology Harbin Institute of TechnologyHarbin 150001China Institute for Advanced Ceramics School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin 150001China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China School of Electromechanical Engineering Guangdong University of TechnologyGuangzhou 510006China

Textured hexagonal boron nitride(h-BN)matrix composite ceramics were prepared by hotpressing using different contents of 3Y_(2)O_(3)–5Al_(2)O_(3)(molar ratio of 3:5)as the sintering *** hot-pressing,the liquid Y_(3)Al_(5)O_(12)(YAG)phase showing good wettability to h-BN grains was in situ formed through the reaction between Y_(2)O_(3) and Al_(2)O_(3),and a coherent relationship between h-BN and YAG was observed with[010]_(h-BN)//[111]_(YAG) and(002)_(h-BN)//(321)_(YAG).In the YAG liquid phase environment formed during hot-pressing,plate-like h-BN grains were rotated under the uniaxial sintering pressure and preferentially oriented with their basal surfaces perpendicular to the sintering pressure direction,forming textured microstructures with the c-axis of h-BN grains oriented parallel to the sintering pressure direction,which give these composite ceramics anisotropy in their mechanical and thermal *** highest texture degree was found in the specimen with 30 wt%YAG,which also possesses the highest anisotropy degree in thermal *** aggregation of YAG phase was observed in the specimen with 40 wt%YAG,which resulted in the buckling of h-BN plates and significantly reduced the texture degree.

关键词： hexagonal boron nitride(h-BN) liquid phase sintering texture anisotropy

达格列净对糖尿病肾病患者血管功能和肾功能的效果研究

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实用临床医药杂志 2024年第10期28卷 78-82页

作者：常爱玲翟雅然王玉金张金成王方珍河北省沧州市中心医院内分泌科河北沧州061000

目的探讨达格列净对糖尿病肾病(DN)患者血管功能和肾功能进展的影响。方法将122例DN患者随机分为对照组和观察组,每组61例,对照组予以常规治疗,观察组予以常规治疗联合达格列净治疗。比较2组患者糖代谢、血管功能、肾功能指标及不良... 详细信息

目的探讨达格列净对糖尿病肾病(DN)患者血管功能和肾功能进展的影响。方法将122例DN患者随机分为对照组和观察组,每组61例,对照组予以常规治疗,观察组予以常规治疗联合达格列净治疗。比较2组患者糖代谢、血管功能、肾功能指标及不良反应。结果治疗后,2组空腹血糖(FPG)、餐后2 h血糖(2 hPG)比较,差异无统计学意义(P>0.05),但观察组糖化血红蛋白(HbA1c)水平低于对照组,差异有统计学意义(P0.05)。结论达格列净可有效缓解DN患者血管功能损伤,抑制肾功能损伤进展。

关键词：达格列净糖尿病肾病血管功能肾功能

Cost-reduction strategies in massive genomics experiments

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Marine Life Science & Technology 2019年第1期1卷 15-21页

作者： Haichao Li Kun Wu Chenchen Ruan Jiao Pan yujin wang Hongan Long Institute of Evolution and Marine Biodiversity KLMMEOcean University of ChinaQingdao 266003China

Many modern biology studies require deep, whole-genome sequencing of hundreds to thousands of samples. Although persamplecosts have dramatically decreased, the total budget for such massive genome sequencing constitutes a significantbarrier for poorly funded labs. The costly lab tools required for genomics experiments further hinder such studies. Here, weshare two strategies for extensively reducing the costs of massive genomics experiments, including miniaturization of theNEBNext Ultra II FS DNA Library Prep Kit for Illumina (reducing the per-sample total costs to ~ 1/6 of that charged byservice providers) and in-lab 3D model-designing of genomics tools. These strategies not only dramatically release fundingpressure for labs, but also provide students with additional training in hands-on genomics and 3D-model-designing skills,demonstrating the high potential for their application in genomics experiments and science education.

关键词： 3D model designing and printing Genome sequencing Lab-made tools Library construction Miniaturization

6082-T6铝合金构件及其超大跨空间结构的受力性能与设计方法

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建筑结构 2024年第19期54卷 80-89页

作者：范峰翟希梅孟令钊赵远征谭艺霖柯王誉瑾 ADEOTI Guy Oyeniran 哈尔滨工业大学结构工程灾变与控制教育部重点实验室哈尔滨工业大学土木工程智能防灾减灾工业和信息化部重点实验室

针对6082-T6铝合金，从材料力学性能、轴压与偏压构件稳定承载力、受弯构件受力性能方面进行了系统试验和数值仿真研究；建立了国产铝合金构件试验数据库，评估了中、欧、美规范及DSM、CSM共5种设计方法的可靠度水平；对6082-T6铝合金... 详细信息

针对6082-T6铝合金，从材料力学性能、轴压与偏压构件稳定承载力、受弯构件受力性能方面进行了系统试验和数值仿真研究；建立了国产铝合金构件试验数据库，评估了中、欧、美规范及DSM、CSM共5种设计方法的可靠度水平；对6082-T6铝合金圆管及泡沫铝填充复合管开展侧向冲击试验与数值仿真研究，提出了构件动态响应计算方法，并建立了冲击下构件变形的预测方法；针对超大跨度铝合金巨型网格结构开展了探索性研究，提出了适用于超大跨度结构的新型节点形式及稳定受力性能分析。研究成果将对6082-T6铝合金构件及结构在工程中的推广应用、提升结构的承载与抗冲击防御能力提供依据与技术支撑。

关键词： 6082-T6铝合金铝合金构件超大跨度铝合金巨型网格结构受力性能设计方法可靠度水平

Comparison of two reader modes of computer-aided diagnosis in lung nodules on low-dose chest CT scan

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Journal of Innovative Optical Health Sciences 2022年第2期15卷 93-105页

作者： Qiongjie Hu Shaofang wang Chong Chen Shichao Kang Ziyan Sun yujin wang Min Xiang Hanxiong Guan Yiwen Liu Liming Xia Department of Radiology Tongji Hospital Tongji Medical CollegeHuazhong University of Science and Technology Jiefang Dadao 1095(#)Wuhan 430030Hu BeiP.R.China Department of Radiology Shenzhen Maternity&Child Healthcare Hospital Affiliated to Southern Medical UniversityHongliShenzhen 518028P.R.China

Low-dose computerized tomography(LDCT)scanning is of great significance for monitoring and management of pulmonary nodules on chest computerized tomography(CT).Nevertheless,the malignant potential of these nodules is often difficult to detect,especially for some smaller pulmonary nodules on LDCT *** advances using the state-of-art computer-aided detection(CAD)system have attempted to address this problem by identifying small nodules that can be easily missed during clinical *** is used in two reading modes:Concurrent-reader(CR)mode or second-reader(SR)*** this study,we prospectively evaluated the efficiency of a CAD system's SR and CR modes in detecting pulmonary nodules on *** found that the SR mode improves pulmonary nodule detection regardless of the dose and ex-perience level,especially for interns in the low-dose *** CR mode maintains the sensi-tivity of SR mode while significantly decreasing reading times.

关键词： Computed tomography radiation dosage pulmonary nodules computer-assisted deep learning