检索结果-南通市图书馆

Integrated high-performance and accurate shaping technology of low-cost powder metallurgy titanium alloys: A comprehensive review

引用

International Journal of Minerals,Metallurgy and Materials 2024年第3期31卷 413-426页

作者： Xuemeng Gan Shaofu Li Shunyuan Xiao yafeng yang State Key Laboratory of Mesoscience and Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Science and Technology on Particle Materials Chinese Academy of SciencesBeijing 100190China

The practical engineering applications of powder metallurgy (PM) Ti alloys produced through cold compaction and pressure-less sintering are impeded by poor sintering densification, embrittlement caused by excessive O impurities, and severe sintering deforma-tion resulting from the use of heterogeneous powder mixtures. This review presents a summary of our previous work on addressing the above challenges. Initially, we proposed a novel strategy using reaction-induced liquid phases to enhance sintering densification. Near- complete density (relative density exceeding 99%) was achieved by applying the above strategy and newly developed sintering aids. By focusing on the O-induced embrittlement issue, we determined the onset dissolution temperature of oxide films in the Ti matrix. On the basis of this finding, we established a design criterion for effective O scavengers that require reaction with oxide films before their dissol-ution. Consequently, a ductile PM Ti alloy was successfully obtained by introducing 0.3wt% NdB6 as the O scavenger. Lastly, a powder- coating strategy was adopted to address the sintering deformation issue. The ultrafine size and shell-like distribution characteristics of coating particles ensured rapid dissolution and homogeneity in the Ti matrix, thereby facilitating linear shrinkage during sintering. As a result, geometrically complex Ti alloy parts with high dimensional accuracy were fabricated by using the coated powder. Our fundament-al findings and related technical achievements enabled the development of an integrated production technology for the high-performance and accurate shaping of low-cost PM Ti alloys. Additionally, the primary engineering applications and progress in the industrialization practice of our developed technology are introduced in this review.

关键词： powder metallurgy titanium sintering densification oxygen scavenging accurate shaping

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Biophysical-driven piezoelectric and aligned nanofibrous scaffold promotes bone regeneration by re-establishing physiological electrical microenvironment

引用

Nano Research 2024年第8期17卷 7376-7393页

作者： Aoao Wang Xinbo Ma yafeng yang Guoliang Shi Liwei Han Xiantong Hu Rui Shi Jun Yan Quanyi Guo Yantao Zhao Senior Department of Orthopedics the Fourth Medical Center of PLA General HospitalBeijing 100048China Department of Chemistry Capital Normal UniversityBeijing 100048China National Center for Orthopaedics Beijing Research Institute of Traumatology and OrthopaedicsBeijing Jishuitan HospitalCapital Medical UniversityBeijing 100035China Xijing 986 Hospital Department The Fourth Military Medical UniversityXi'an 710032China Institute of Orthopedics Chinese PLA General HospitalBeijing Key Laboratory of Regenerative Medicine in OrthopedicsKey Laboratory of Musculoskeletal Trauma&War Injuries PLABeijing 100853China

The initial healing stages of bone fracture is a complex physiological process involving a series of spatially and temporally overlapping events,including pathogen clearance,immunological modulation,and *** this study,we have developed a piezoelectric and aligned nanofibrous scaffold composed of ZnO@PCL/PVDF with multiple antibacterial,immunomodulatory,and osteogenic effects using electrospinning *** scaffold’s piezoelectric signal output under ultrasound(US)control can be similar to the physiological electrical signals of healthy bone tissue,creating a truly biomimetic electrical microenvironment in the bone *** vitro studies have shown that ZnO@PCL/PVDF scaffold significantly enhances the proliferation,migration,and osteogenic differentiation of MC3T3-E1 cells under piezoelectric drive provided by ***,the scaffold exhibits inhibitory effects on the growth of *** and ***,as well as the ability to induce M2 macrophage polarization,indicating potent antibacterial and immunomodulatory *** vivo experiments demonstrated that the ZnO@PCL/PVDF scaffold can accelerate the repair of mandibular defects in rats,effectively inhibit bacterial colonization,and reduce inflammatory ***,this study confirms that the newly developed ZnO@PCL/PVDF scaffold effectively promotes bone repair by truly mimicking the endogenous electrical microenvironment and precisely regulating the temporospatial disorders of initial bone healing,thus providing a simple and effective solution for bone defects.

关键词： piezoelectricity bone defect bacterial infection ZnO nanoparticles immunomodulation osteogenesis

来源：

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

Gas-phase synthesis of Ti_(2)CCl_(2) enables an efficient catalyst for lithiumsulfur batteries

引用

The Innovation 2024年第1期5卷 33-40页

作者： Maoqiao Xiang Zihan Shen Jie Zheng Miao Song Qiya He yafeng yang Jiuyi Zhu Yuqi Geng Fen Yue Qinghua Dong Yu Ge Rui Wang Jiake Wei Weiliang Wang Haiming Huang Huigang Zhang Qingshan Zhu Chuanfang John Zhang State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Chemical Engineering University of the Chinese Academy of SciencesBeijing 100049China Innovation Academy for Green Manufacture Chinese Academy of SciencesBeijing 100190China China Nuclear Power Engineering Co. Ltd.117 West Third Ring RoadNorth SectionBeijing 100840China College of Materials Science&Engineering Sichuan UniversityChengdu 610065China State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China School of Physics Guangdong Province Key Laboratory of Display Material and TechnologyCenter for Neutron Science and TechnologySun Yat-sen UniversityGuangzhou 510275China Solid State Physics&Material Research Laboratory School of Physics and Materials ScienceGuangzhou UniversityGuangzhou 510006China

MXenes have aroused intensive enthusiasm because of their exotic properties and promising ***,to date,they are usually synthesized by etching *** synthetic technologies provides more opportunities for innovation and may extend unexplored ***,we report a bottom-up gas-phase synthesis of Cl-terminated MXene(Ti_(2)CCl_(2)).The gas-phase synthesis endows Ti_(2)CCl_(2) with unique surface chemistry,high phase purity,and excellent metallic conductivity,which can be used to accelerate polysulfide conversion kinetics and dramatically prolong the cyclability of Li-S ***-depth mechanistic analysis deciphers the origin of the formation of Ti_(2)CCl_(2) and offers a paradigm for tuning MXene chemical vapor *** brief,the gas-phase synthesis transforms the synthesis of MXenes and unlocks the hardly achieved potentials of MXenes.

关键词： synthesis phase lithium

来源：

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

黄河流域九省区水-土-能-碳关联系统网络特征

引用

水利水电科技进展 2024年第4期44卷 31-37页

作者：王菲陈敏曹永强杨亚锋辽宁师范大学地理科学学院辽宁大连116029 清华大学水圈科学与水利工程全国重点实验室北京100084 华北理工大学理学院河北唐山063210

基于区域环境扩展型投入产出模型,对黄河流域水-土-能-碳资源消耗及足迹流动、区域资源及碳排放流通状况、水-土-能-碳网络特征进行了模拟分析。结果表明:2017年黄河流域九省区水资源消耗总量为1 073.69亿m^(3),占用土地面积为266.69万k... 详细信息

基于区域环境扩展型投入产出模型,对黄河流域水-土-能-碳资源消耗及足迹流动、区域资源及碳排放流通状况、水-土-能-碳网络特征进行了模拟分析。结果表明:2017年黄河流域九省区水资源消耗总量为1 073.69亿m^(3),占用土地面积为266.69万km^(2),能源消耗为6.95亿t(标准煤),碳排放量为31.57亿t。在流域内部足迹流动中,河南水、土、能、碳足迹均最大,综合循环利用率最高;宁夏是最大的虚拟水资源供应地;山西能、碳足迹调出量最大;山东土地足迹循环利用率最高;青海是主要的水、土、能资源供应地,四川承接了黄河流域19.3亿t碳足迹。黄河流域水-土-能-碳关联系统的生态关系主要以竞争关系为主,控制、掠夺关系占比较小,无互利共生关系;水-土-能-碳关联系统的生态关系处于高冗余、低效率状态,能源网络的效率最高。

关键词： “双碳”目标水-土-能-碳关联系统网络特征黄河流域

来源：

维普期刊数据库博看期刊

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

数字化测绘技术在煤矿地质测量中的应用

引用

能源与节能 2024年第4期 321-324页

作者：杨亚峰山西焦煤霍州煤电店坪煤矿山西方山033100

随着科学技术的不断发展,数字化测绘技术在煤矿地质测量中的应用已经成为一个研究的热点。煤矿作为重要的能源资源,对地质测量数据的准确性和全面性要求较高,而传统的地质测量方法存在一定局限,难以满足煤矿地质勘探和资源利用的需求。... 详细信息

随着科学技术的不断发展,数字化测绘技术在煤矿地质测量中的应用已经成为一个研究的热点。煤矿作为重要的能源资源,对地质测量数据的准确性和全面性要求较高,而传统的地质测量方法存在一定局限,难以满足煤矿地质勘探和资源利用的需求。以数字化测绘技术的应用为研究对象,通过综合分析和归纳,旨在探讨其在煤矿地质测量中的优势和应用价值。

关键词：数字化测绘技术煤矿地质测量应用研究

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

浅谈普及模糊数学的必要性和可行性

教育教学研究前沿

引用

教育教学研究前沿 2024年第6期2卷 4-6页

作者：杨亚锋华北理工大学理学院河北唐山063210

自1965年模糊数学诞生以来,这一学科在推动基础数学理论发展、为不确定数学方法研究提供创新机会方面发挥了重要作用。模糊数学的核心工具——模糊集合,打破了传统集合论中的严格界限,为二值逻辑向多值逻辑的拓展开辟了新道路。在当前... 详细信息

自1965年模糊数学诞生以来,这一学科在推动基础数学理论发展、为不确定数学方法研究提供创新机会方面发挥了重要作用。模糊数学的核心工具——模糊集合,打破了传统集合论中的严格界限,为二值逻辑向多值逻辑的拓展开辟了新道路。在当前创新驱动发展和课程思政教学的背景下,普及模糊数学思想与方法显得尤为重要。因此,认识并描述客观世界的模糊性和不确定性是培养青年学生创新思维的必要前提,而模糊数学正是其重要途径之一。本文在前人研究的基础上,再次探讨普及模糊数学基本思想与方法的必要性和可行性,旨在为扩宽学科教学领域和延伸数学思维边界起到一定的推动作用。

关键词：模糊数学不确定性课程思政必要性可行性

来源：

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

可变TOPSIS水安全韧性三支决策方法及应用

引用

水科学进展 2024年第4期35卷 595-605页

作者：杨亚锋王红瑞曹永强刘琳曹文梅华北理工大学理学院河北唐山063210 北京师范大学水科学研究院北京100875 天津师范大学京津冀生态文明发展研究院天津300387 华北理工大学建筑工程学院河北唐山063210

为克服当前水安全评价中常用的TOPSIS方法适用于排序但决策指导意义相对较弱的不足,借助可变模糊集中的相对隶属度方法改进其数据标准化过程,进而计算贴近度用于估计三支决策中的条件概率,基于综合阈值生成三支决策规则;设置不同的风险... 详细信息

为克服当前水安全评价中常用的TOPSIS方法适用于排序但决策指导意义相对较弱的不足,借助可变模糊集中的相对隶属度方法改进其数据标准化过程,进而计算贴近度用于估计三支决策中的条件概率,基于综合阈值生成三支决策规则;设置不同的风险规避系数(σ),动态细化三支决策粒度,实现等级评判和调控决策。基于韧性理念,从抵抗性、恢复性和适应性3个方面构建水安全评价指标体系,并以京津冀地区为例开展实证研究。结果表明:2006—2020年,京津冀三地的水安全水平稳中有升,空间分异特征显著;北京和天津年际变化较小,河北2015年以来则有显著提升;当前北京和天津水安全的主要韧性调控方向为抵抗性,而河北则需要进一步加强适应性。

关键词：水安全韧性可变模糊集相对隶属度 TOPSIS 三支决策京津冀地区

来源：

维普期刊数据库博看期刊

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

南水北调东线一期工程受水区生态环境效益演变

引用

南水北调与水利科技（中英文） 2024年第3期22卷 566-574页

作者：高媛媛杨亚锋杨荣雪刘艺欣王红瑞水利部南水北调规划设计管理局北京100038 华北理工大学理学院河北唐山063210 中国南水北调集团东线有限公司北京100070 北京师范大学水科学研究院北京100875

研究南水北调东线一期工程通水以来受水区生态环境效益的演变态势,对南水北调后续工程高质量建设、加快构建国家水网以及促进工程综合效益发挥有决策参考作用。以定性定量相结合的方式分析东线一期工程在优化水资源配置、保障饮水安全... 详细信息

研究南水北调东线一期工程通水以来受水区生态环境效益的演变态势,对南水北调后续工程高质量建设、加快构建国家水网以及促进工程综合效益发挥有决策参考作用。以定性定量相结合的方式分析东线一期工程在优化水资源配置、保障饮水安全、复苏河湖生态环境和畅通南北经济循环等方面的作用,进而结合层次分析法,从直接效益和间接效益2个方面,筛选构建东线一期工程受水区生态环境效益评价指标体系,主要包括工程年供水量、水质改善度、生态补水量、地下水压采量、地下水水位、水域面积、绿地面积和涵养水源等,并采用VlseKriterijumska Optimizacija I Kompromisno Resenje(VIKOR)多准则妥协解排序方法对南水北调东线一期工程通水以来即2013-2022年受水区生态环境效益演变态势进行分析。结果表明:南水北调东线一期工程通水的10年以来,受水区的生态环境整体复苏效果明显,近3年排序值保持在0.8以上;受降水偏枯进而影响地下水开采量和地下水水位等因素影响,2019年间接生态环境效益下降29.2%,之后迅速恢复并保持稳定。在分析直接效益和间接效益演变的基础上,从工程提质增效、提高工程水质状况以及完善体制机制建设等方面提出东线一期工程进一步促进受水区生态环境持续改善的策略和建议,以期为东线工程及受水区生态环境保护及高质量发展相关研究、决策制定等提供参考。

关键词：南水北调东线一期工程生态环境效益指标体系 VIKOR

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effect of alloying on the properties of 9Cr low activation martensitic steels

引用

Acta Metallurgica Sinica(English Letters) 2010年第6期23卷 451-460页

作者： Rong MA yafeng yang Qingzhi YAN Ying yang Xinggang LI Changchun GE Institute of Nuclear Materials University of Science and Technology Beijing Beijing 100083 China

Two types of 9Cr low activation martensitic steels （named 9Cr-1 and 9Cr-2） were developed in University of Science and Technology Beijing. 9Cr-1 and 9Cr-2 were produced by vacuum induction melting method, and examinations of the microstruc- tures were carried out with X-ray diffraction analysis, optical microscopy, scanning electron microscopy and transmission electron microscopy. The ultimate tensile strength and yield tensile strength were evaluated with tensile tests. The impact properties were characterized with Charpy impact experiments. The results indi- cated that 9Cr-1 and 9Cr-2 on as-received condition （95 ~C/30 min/water quenching plus 780 ~C/90 min/air cooling） were flflly martensitic steels free of ^-ferrite. The ul- timate tensile strength of 9Cr-1 and 9Cr-2 were 695 MPa and 680 MPa, respectively. However, 9Cr-2 showed a fine grain size of 4.8 pm, and its value of ductile-brittle transition temperature （DBTT） was -90 ~C under as-received condition. The additions of vanadium, titanium and boron accelerated the formation of MX precipitates and resulted in fine grains and precipitates. The fine grains effectively reduced the value of DBTT from -60 ℃ to -90 ℃ with identical upper shelf energy （USE）. The decrease in silicon concentration of 9Cr-2 induced a slight reduction in ultimate tensile strength from 695 MPa to 680 MPa.

关键词： 9Cr low activation martensitie steel Grain size Mechanical properties

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Metallurgical characterization of Ti-bearing 9Cr low activation martensitic steel

引用

Acta Metallurgica Sinica(English Letters) 2011年第1期24卷 9-17页

作者： Rong MA yafeng yang Qingzhi YAN Ying yang Xinggang LI Changchun GE Institute of Nuclear Materials University of Science and Technology Beijing Beijing 100083 China

Two heats of low activation martensitic （LAM） steels with Ti and Ta （denominated as 9Cr-Ti and 9Cr-Ta）, respectively, developed as candidate structure materials for nuclear reactor were characterized. This paper was focused on the effect of titanium on the microstructures and mechanical properties of 9Cr LAM steel in as-received condition （normalized at 950 ℃ for 30 min with water quenching plus tempered at 780 ℃ for 90 min with air cooling）. Chemical analysis and microstructure observation were conducted on 9Cr-Ti and 9Cr-Ta with optical microscopy, X-ray diffraction analysis, scanning electron microscopy and transmission electron microscopy. Impact properties and tensile strengths were measured with Charpy impact experiments and tensile tests. The results indicated that 9Cr-Ti and 9Cr-Ta were fully martensitic steels in as-received condition. MX type and M23C6 type precipitates were observed distributing along boundaries of prior austenite grains and martensite laths in *** addition of titanium accelerated the precipitation of TiC and TiN, and produced much finer grains in 9Cr-Ti than 9Cr-Ta at the same normalization temperature. Mechanical properties tests showed the ductile brittle transition temperatures of 9Cr- Ti and 9Cr-Ta were about -90℃ and -85℃, respectively. The ultimate tensile strengths at room temperature and 600℃,were 680 MPa and 365 MPa for 9Cr-Ti, and 660 MPa and 335 MPa for 9Cr-Ta, respectively. The favorite impact toughness and tensile properties of 9Cr-Ti could be attributed to the fine grains in as-received condition.

关键词： 9Cr low activation martensitic steel Alloying effect Microstructure Mechanical properties

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：