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Synthesis and property characterization of ternary laminar Zr_(2)SB ceramic

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Journal of Advanced Ceramics 2022年第5期11卷 825-833页

作者： Qiqiang ZHANG Shuai FU Detian wan Yiwang BAO Qingguo FENG Salvatore GRASSO chunfeng HU Key Laboratory of Advanced Technologies of Materials Ministry of EducationSchool of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China State Key Laboratory of Green Building Materials China Building Materials AcademyBeijing 10000China

In this paper,Zr_(2)SB ceramic with purity of 82.95 wt%(containing 8.96 wt%ZrB_(2)and 8.09 wt%zirconium)and high relative density(99.03%)was successfully synthesized from ZrH_(2),sublimated sulfur,and boron powders by spark plasma sintering(SPS)at 1300℃.The reaction process,microstructure,and physical and mechanical properties of Zr_(2)SB ceramic were systematically *** results show that the optimum molar ratio to synthesize Zr_(2)SB is n(ZrH_(2)):n(S):n(B)=1.4:1.6:*** average grain size of Zr_(2)SB is 12.46μm in length and 5.12μm in width,and the mean grain sizes of ZrB2 and zirconium impurities are about 300 *** terms of physical properties,the measured thermal expansion coefficient(TEC)is 7.64×10^(-6) K^(-1) from room temperature to 1200℃,and the thermal capacity and thermal conductivity at room temperature are 0.39 J·g^(-1)·K^(-1)and 12.01 W·m^(-1)·K^(-1),*** room temperature electrical conductivity of Zr_(2)SB ceramic is measured to be 1.74×10^(6)Ω^(-1)·m^(-1).In terms of mechanical properties,Vickers hardness is 9.86±0.63 GPa under 200 N load,and the measured flexural strength,fracture toughness,and compressive strength are 269±12.7 MPa,3.94±0.63 MPa·m1/2,and 2166.74±291.34 MPa,respectively.

关键词： Zr_(2)SB spark plasma sintering(SPS) reaction path microstructure properties

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Hot forging Nb_(4)AlC_(3)ceramics with enhanced properties

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Journal of Advanced Ceramics 2023年第11期12卷 2032-2040页

作者： Ye Yu Shuai Fu Detian wan Yiwang Bao Longsheng Chu Qingguo Feng chunfeng Hu Key Laboratory of Advanced Technologies of Materials Ministry of EducationSchool of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China State Key Laboratory of Green Building Materials China Building Materials AcademyBeijing 100024China

Textured Nb_(4)AlC_(3)ceramics were rapidly and efficiently prepared by hot forging through spark plasma sintering(SPS).The longitudinal compression ratio of textured Nb_(4)AlC_(3)ceramics was−78.3%,and the lateral expansion ratio was 32.1%.The grains grew preferentially along the direction perpendicular to the c-axis,forming the texture *** Lotgering orientation factor f(00l)was calculated to be *** thermal conductivity of textured Nb_(4)AlC_(3)ceramics along the c-axis direction(11.23 W·m^(−1)·K^(−1))(25℃)was lower than that of untextured ceramics(13.75 W·m^(−1)·K^(−1))(25℃).The electrical conductivity perpendicular to the c-axis direction reached 4.37×10^(6) S·m^(−1)at room *** ordered layered grains increased the resistance of crack propagation,resulting in a higher fracture toughness parallel to the c-axis direction(9.41 MPa·m^(1/2)),which was higher than that of untextured ceramics(6.88 MPa·m1/2).The Vickers hardness tested at 10 N on the texture top surface(7.18 GPa)was higher than that on the texture side surface(6.45 GPa).

关键词： Nb_(4)AlC_(3) texture anisotropy microstructure properties

基于对分课堂教学模式的《机械工程材料与热加工基础》课程的教学改革与实践研究

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陕西国防职教研究 2023年第4期33卷 3-6页

作者：万春锋陕西国防工业职业技术学院陕西西安710300

对分课堂是一种新型高效的教学组织模式。从对分课堂的实施步骤,教学过程中遇到的问题,整个课程对分设计模式3个方面探讨了《机械工程材料与热加工基础课程》的教学改革方法。经过研究发现,对分课堂教学模式在提高学生学习积极性方面卓... 详细信息

对分课堂是一种新型高效的教学组织模式。从对分课堂的实施步骤,教学过程中遇到的问题,整个课程对分设计模式3个方面探讨了《机械工程材料与热加工基础课程》的教学改革方法。经过研究发现,对分课堂教学模式在提高学生学习积极性方面卓有成效,是一种非常值得推广的教学模式。

关键词：对分课堂教学改革教学模式工程材料

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校企合作下焊接专业人才培养模式的改革研究

绿色科技 2022年第7期24卷 255-259页

作者：万春锋陕西国防工业职业技术学院陕西西安710300

分析了高职焊接专业现行人才培养模式的问题和不足,并从课程体系、产教融合和校企合作路径等方面提出了改革人才培养模式的策略。研究发现:通过校企共同制定人才培养方案、课程标准和以企业的产品为载体开发相应的课程等途径,使合作企... 详细信息

分析了高职焊接专业现行人才培养模式的问题和不足,并从课程体系、产教融合和校企合作路径等方面提出了改革人才培养模式的策略。研究发现:通过校企共同制定人才培养方案、课程标准和以企业的产品为载体开发相应的课程等途径,使合作企业深度参与到人才培养的过程中,真正做到“教学做”一体化,才能实现人才的培养目标,最终建立了“岗位培养订单”“厂中校”等产教融合、协同育人的特色化人才培养模式。研究结果表明:深度的校企合作是提高人才培养质量的必经之路,专业老师必须积极探索合作的载体、不断提高专业老师的社会服务能力,与企业专家一起为企业解决棘手的技术难题,使企业由被动合作变为主动协作,实现双赢。

关键词：人才培养模式课程体系产教融合焊接课程标准

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Effect of potential difference between nano-Al_(2)O_(3)whisker and Mg matrix on the dispersion of Mg composites

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International Journal of Minerals,Metallurgy and Materials 2023年第1期30卷 104-111页

作者： Xiaoying Qian Hong Yang chunfeng Hu Ying Zeng Yuanding Huang Xin Shang Yangjie wan Bin Jiang Qingguo Feng National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044China College of Materials Science and Engineering Chongqing UniversityChongqing 400044China Key Laboratory of Advanced Technologies of Materials Ministry of EducationSchool of Material Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China Institute of Metallic Biomaterials Helmholtz-Zentrum HereonMax-Planck-Str.1D-21502 GeesthachtGermany School of Mechanical Engineering Dongguan University of TechnologyDongguan 523808China

The potential difference between positive and negative ions was utilized to improve the homogenized dispersion of nanoscale Al_(2)O_(3) whiskers in Mg matrix *** Mg powders were decorated with sodium dodecylbenzene sulfonate(C_(18)H_(29)NaO_(3)S,SDBS)and were introduced to the cathode group on their *** Al_(2)O_(3) whiskers were modified by the cetyl trimethyl ammonium bromide(C_(19)H_(42)BrN,CTAB)and were featured in the anode *** suitable contents of CTAB and SDBS,the application atmosphere,and the type of solvents were *** results showed that adding 2wt%SDBS into Mg powders and adding 2wt%CTAB into Al_(2)O_(3) whiskers pro-moted the formation of more uniformly mixed composite powders,compared to those of conventional ball milling via scanning electron micro-scopy(SEM)***,the calculated results derived from first-principle calculations also demonstrated the stronger cohesion between Al_(2)O_(3) whisker reinforcements and Mg matrix than undecorated composite *** preparation by powder metallurgy,the mor-phology,grain size,hardness,and standard deviation coefficient of composites were analyzed to evaluate the dispersed *** results indicated that the modification of homogenized dispersed Al_(2)O_(3) whiskers in composites contributed to the refinement of 26%in grain size and the improvement of 20%in hardness compared with pure Mg,and the reduction of 32.5%in the standard deviation coefficient of hardness compared with the ball-milling sample.

关键词： magnesium-based composites Al_(2)O_(3)whiskers potential difference dispersion

维普期刊数据库

Emerging RD on membranes and systems for water reuse and desalination

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西湖凹陷中北部花港组上段浅水辫状河三角洲发育特征

中国化学工程学报（英文版） 2019年第7期

作者： Tai-Shung Chung Dieling Zhao Jie Gao Kangjia Lu chunfeng wan Martin Weber Christian Maletzko

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海洋地质前沿 2024年第10期40卷 39-48页

作者：陈春峰徐东浩张银国唐贤君万延周冯桢鸣何新建俞伟哲中海石油(中国)有限公司上海分公司中国地质调查局青岛海洋地质研究所

从分析岩芯资料和砂体平面展布着手，重新厘定了东海盆地西湖凹陷中北部花港组上段H4、H5砂组的沉积相，创新提出了研究区花上段发育浅水辫状河三角洲沉积，研究区中南部发育规模性砂体。研究认为：在研究区的西部及东部边缘为辫状河三... 详细信息

从分析岩芯资料和砂体平面展布着手，重新厘定了东海盆地西湖凹陷中北部花港组上段H4、H5砂组的沉积相，创新提出了研究区花上段发育浅水辫状河三角洲沉积，研究区中南部发育规模性砂体。研究认为：在研究区的西部及东部边缘为辫状河三角洲平原相主导区，以发育辫状河三角洲平原河道砂体为主，局部有少量的辫状河三角洲前缘相发育。在研究区的中部及中南部，为辫状河三角洲平原与辫状河三角洲前缘交互发育区，主要特征是在较短的沉积期内形成了三角洲平原相与三角洲前缘相交互沉积；在枯水期时，以发育三角洲平原沉积为主，南部边缘发育三角洲前缘相沉积；在丰水期时，主要发育三角洲前缘相沉积及少量浅湖相沉积。在浅水辫状河三角洲沉积模式指导下，在研究区中南部发现了众多三角洲水道砂体及朵叶状砂体，这些砂体被钻井证实为油气藏。研究区的中南部仍然是油气勘探的潜力区，这一认识已被最新探井所证实。

关键词：东海盆地西湖凹陷浅水辫状河三角洲沉积花港组砂体展布

Effects of sleep fragmentation on white matter pathology in a rat model of cerebral small vessel disease

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Effects of sleep fragmentation on white matter pathology in ...

The recommendations of Chinese Parkinson’s disease and movement disorder society consensus on therapeutic management of Parkinson’s disease

中国睡眠研究会第十五届全国学术年会

作者： Xiang Fu Xiaojie wan chunfeng Liu Department of Neurology and Clinical Research Center of Neurological Disease The Second Affiliated Hospital of Soochow University

Study Objectives: Mounting evidence indicated the correlation between sleep and cerebral small vessel disease(CSVD).However, little is known about the exact causality between poor sleep and white matter injury, a typical signature of CSVD, as well as the underlying ***: Spontaneously hypertensive rats(SHR) and control Wistar Kyoto rats were subjected to sleep fragmentation(SF) for 16 *** effects of chronic sleep disruption on the deep white matter and cognitive performance were ***: SHR were validated as a rat model for *** sleep induced strain-dependent white matter abnormalities, characterized by reduced myelin integrity, impaired oligodendrocytes precursor cells(OPC) maturation and pro-inflammatory microglial *** reversible phenotypes of OPC and microglia were observed in parallel following sleep ***: Long-term SF-induced pathological effects on the deep white matter in a rat model of *** pro-inflammatory microglial activation and the block of OPC maturation may be involved in the mechanisms linking sleep to white matter injury.

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Translational Neurodegeneration 2016年第1期5卷 95-106页

作者： Shengdi Chen Piu Chan Shenggang Sun Haibo Chen Baorong Zhang Weidong Le chunfeng Liu Guoguang Peng Beisha Tang Lijuan wang Yan Cheng Ming Shao Zhenguo Liu Zhenfu wang Xiaochun Chen Mingwei wang Xinhua wan Huifang Shang Yiming Liu Pingyi Xu Jian wang Tao Feng Xianwen Chen Xingyue Hu Anmu Xie Qin Xiao Department of Neurology Ruijin Hospital affiliated to Shanghai Jiao Tong University School of MedicineShanghai 200025China Xuanwu Hospital affiliated to Capital Medical University BeijingChina Tongji Hospital affiliated to Tongji Medical College of Huazhong University of Science and Technology WuhanChina Beijing Hospital BeijingChina The Second Hospital affiliated to Zhejiang University School of Medicine HangzhouChina The First Hospital affiliated to Dalian Medical University DalianChina The Second Affiliated Hospital of Soochow University SuzhouChina The First Hospital affiliated to Chongqing Medical University ChongqingChina Xiangya Hospital Central South UniversityChangshaChina Guangdong General Hospital GuangzhouChina General Hospital affiliated to Tianjin Medical University TianjinChina Sichuan Rehabilitation Hospital ChengduChina Xinhua Hospital affiliated to Shanghai Jiaotong University School of Medicine ShanghaiChina Chinese PLA General Hospital BeijingChina Fujian Medical University Union Hospital FuzhouChina The First Hospital affiliated to Hebei Medical University ShijiazhuangChina Peking Union Medical College Hospital BeijingChina West China Hospital affiliated to Sichuan University ChengduChina Qilu Hospital affiliated to Shandong University JinanChina The First Hospital affiliated to Guangzhou Medical University GuangzhouChina Huashan Hospital affiliated to Fudan University ShanghaiChina Tiantan Hospital affiliated to Capital Medical University BeijingChina The First Hospital affiliated to Anhui Medical University HefeiChina Sir Run Run Shaw Hospital affiliated to Zhejiang University School of Medicine HangzhouChina The Affiliated Hospital Qingdao University School of MedicineQingdaoChina

Background:Parkinson’s disease(PD)is a chronic,progressive and debilitating disease,which affects over 2.5 million people in *** is characterized clinically by resting tremor,muscular rigidity,bradykinesia and postural *** the disease progresses,additional complications can arise such as non-motor and neurobehavioral *** treatment and surgical intervention for PD have been implemented in *** 10 years ago,there was lack of standardization for the management of PD in different regions and among different physicians,leading to different treatment levels in different regions and different *** then,the Chinese Parkinson’s Disease and Movement Disorder Society have published three versions of guidelines for the management of PD in China,in 2006,2009 and 2014,***,the overall level of treatment for PD in China ***:To update the treatment guidelines based on current foreign and domestic practice guidelines and clinical evidence,and to improve the treatment options available to physicians in the management of ***:A variety of treatment recommendations in the treatment guidelines have been proposed,including physical activity and disease-modifying medication,which should be initiated at the early-stage of the *** principles of dosage titration should be followed to avoid acute adverse reactions to the drugs,to achieve a satisfactory clinical effect with a low dose and to reduce the incidence of long-term motor ***,different treatment strategies should be considered at different stages of the ***,treatment guidelines and personalized treatments should be valued equally.A set of treatment recommendations has been developed to assist physicians to improve and optimize clinical outcomes for patients with PD in China.

关键词： Parkinson’s disease Treatment guideline optimal therapeutic options China