检索结果-南通市图书馆

Ultrafine grained metastable Ti6Al4V5Cu alloy with high strength and excellent low-cycle fatigue property

Journal of Materials Science & Technology 2022年第34期129卷 240-250页

作者： Wei Song Hai Wang Yi Li Shuyuan Zhang ling ren Ke Yang Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China

The insufficient low-cycle fatigue properties of titanium alloys under cyclic heavy loading are regarded as a challenge for their security in service. In recent years, a large number of studies have found that the transformation induced plasticity(TRIP) effect could hinder the propagation of fatigue cracks, which significantly improved the low-cycle fatigue properties of titanium alloys. However, the coarse β-phase grains and the soft phase transformation product α phase in TRIP titanium alloys impair their tensile strength, which restrict their applications in engineering. To this end, a Ti6Al4V5Cu alloy with TRIP effect was developed in this work. It was proposed to use the mutual restraint between the α and βphases in the material to refine the grains, and through composition optimization, the phase transformation product would be the α’ phase, which has a higher strength than the α phase. Thus, the strength of the Ti6Al4V5Cu alloy can be improved. The results showed that the tensile strength and elongation of the TRIP Ti6Al4V5Cu alloy was 1286 MPa and 22%, which was 23.7% and 46.7% higher than that of the traditional Ti6Al4V alloy, respectively. Besides, under the same strain amplitude, the fatigue life of the Ti6Al4V5Cu alloy was 2–5 times longer than that of the Ti6Al4V alloy. Furthermore, we clarified the mechanisms of improving the tensile strength and fatigue properties of the Ti6Al4V5Cu alloy, which would lay a research foundation for the development of high-performance titanium alloys.

关键词： Transformation induced plasticity Ti alloys Low-cycle fatigue Work hardening Crack propagation

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

Effects of surface roughening on antibacterial and osteogenic properties of Ti-Cu alloys with different Cu contents

引用

Journal of Materials Science & Technology 2021年第29期88卷 158-167页

作者： Wei Zhang Shuyuan Zhang Hui Liu ling ren Qiang Wang Yang Zhang School and Hospital of Stomatology China Medical UniversityShenyang 110001China Liaoning Provincial Key Laboratory of Oral Diseases Shenyang 110001China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China

In order to reduce implant-related infections and improve early osseointegration,we performed HF+anodic oxidation on the surface of the new antibacterial Ti-Cu alloy to make the titanium-based implants have a micro/submicron *** this basis,a series of surface-modified Ti-x Cu alloys with different Cu contents(3,5 and 7 wt%)were fabricated and a comprehensive study was conducted on MC3 T3-E1 cell adhesion,proliferation,apoptosis and its antibacterial activity against Staphylococcus *** showed that the Ti-x Cu alloys by HF etching+anodized possessed multifunctional characteristics of antibiofilm and antibacterial abilities,excellent biocompatibility and osteogenesis promoting *** of Cu content significantly contributed to the antibacterial and osteogenic properties of HF etching+anodized Ti-Cu *** proliferation rates of HF etching+anodized Ti-7 Cu alloys were lower than those of Ti-3 Cu and Ti-5 Cu alloys,while the early cell apoptosis rates were higher than Ti-3 Cu and Ti-5 Cu *** the above results finally presented that the HF etching+anodized Ti-5 Cu alloy exhibited extremely strong antibacterial properties,good biological compatibility and osteogenic ability,as well as the most excellent ductility and corrosion resistance,providing a great potential application for the future dental implantation.

关键词： Ti-Cu Cu contents HF Antibacterial Osteogenesis

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

稀土元素Er、Yb和Y掺杂ZrO_(2)的第一性原理研究

引用

原子与分子物理学报 2025年第1期42卷 156-162页

作者：熊威任浩重庆交通大学航空学院重庆402247 重庆交通大学绿色航空技术研究院重庆401147

氧化锆具有声子能量低,介电常数高和带隙较宽等优良特性,并且立方相的氧化锆(cZrO_(2))透光率高,适合作为上转换发光材料的基质.采用基于密度泛函理论(DFT)的第一性原理平面波赝势法研究了稀土元素Er、Yb和Y掺杂cZrO_(2)的电子结构和光... 详细信息

氧化锆具有声子能量低,介电常数高和带隙较宽等优良特性,并且立方相的氧化锆(cZrO_(2))透光率高,适合作为上转换发光材料的基质.采用基于密度泛函理论(DFT)的第一性原理平面波赝势法研究了稀土元素Er、Yb和Y掺杂cZrO_(2)的电子结构和光学性质.计算结果显示,掺入Y元素后,cZrO_(2)转变为直接带隙材料,继续掺入Er和Yb原子后,费米能级移动到价带内,带隙显著减小.Y和Er混掺后,增强了cZrO_(2)在近红外波段的吸收能力.继续掺入Yb后,cZrO_(2)对近红外波段的吸收能力有了进一步地增加.

关键词：氧化锆第一性原理电子结构光学性质

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

Synthesis of mechanically robust porous carbon monoliths for CO2 adsorption and separation

引用

Journal of Energy Chemistry 2020年第3期29卷 56-61页

作者： Jie Du Wen-cui Li Zhan-Xin ren Li-Ping Guo An-Hui Lu State Key Laboratory of Fine Chemicals School of Chemical EngineeringDalian University of TechnologyDalian 116024LiaoningChina

Porous carbon materials with developed porosity,high surface area and good thermal-and chemicalresistance are advantageous for gas adsorption and ***,most carbon adsorbents are in powder form which exhibit high pressure drop when deployed in practical separation *** monolithic carbons have largely addressed the pulverization problem and preserved kinetics and usually suffer from abrasion during multiple adsorption-desorption ***,we proposed the designed synthesis of mechanically robust carbon monoliths with hierarchical pores,solid nitrogen-containing *** synthesis started with the polymerization of resorcinol and formaldehyde under weakly acidic conditions generated from cyanuric acid,and then an appropriate amount of hexamethylenetetramine(HMTA)was added as a crosslinker to prompt the formation of three dimensional *** carbonization process,the as-obtained porous carbon monoliths have a high radial compressive strength of 886 N/cm as well as a BET specific surface area of up to 683 m2/*** approximately 1 bar,the CO2 equilibrium capacities of the monoliths are in the range of 3.1–4.0 mmol/g at 273 K and of 2.3–3.0 mmol/g at 298 K,exhibiting high selectivity for the capture of CO2 over N2 from a stream which consists of 16.7%(v%)CO2 in ***,they undergo a facile CO2 release in an argon stream at 298 K,indicating a good regeneration *** cycle testing,sieving and regeneration,the adsorbent has no mass loss,compared to that of its fresh counterpart.

关键词： Carbon monoliths High mechanical strength Adsorption Gas separation

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

Au-decorated porous structure graphene with enhanced sensing performance for low-concentration NO2 detection

引用

Rare Metals 2020年第6期39卷 651-658页

作者： Yan-Yan Fan Hai-ling Tu Yu Pang Feng Wei Hong-Bin Zhao Yi Yang Tian-ling ren State Key Laboratory of Advanced Materials for Smart Sensing General Research Institute for Nonferrous MetalsBeijing 100088China GRIMAT Engineering Institute Co. LtdBeijing 101407China Institute of Microelectronics Tsinghua UniversityBeijing 100084China General Research Institute for Nonferrous Metals Beijing 100088China Beijing National Research Center for Information Science and Technology(BNRist) Tsinghua UniversityBeijing 100088China

A recent progress in new emerging two-dimensional(2 D)materials has provided promising opportunity for gas sensing in ultra-low detectable *** this work,we have demonstrated a flexible NO2 gas sensor with porous structure graphene on polyethylene terephthalate substrates operating at room *** gas sensor exhibited good performance with response of 1.2%and a fast response time within 30 s after exposure to50×10^-9 NO2 *** porous structure of graphene increased the surface area,the sensor showed high sensitivity of ppb level for NO2 *** nanoparticles were decorated on the surface of the porous structure graphene skeleton,resulting in an incensement of response compared with pristine *** nanoparticles-decorated graphene exhibits not only better sensitivity(1.5-1.6 times larger than pristine graphene)for NO2 gas detection,but also fast *** sensor was found to be robust and sensitive under the cycling bending test,which could also be ascribed to the merits of *** porous structure graphene-based gas sensor is expected to enable a simple and inexpensive flexible gas sensing platform.

关键词： Graphene Au nanoparticles Porous structure Gas sensor Nitrogen dioxide(NO2)

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

The cloud-microphysical cause of torrential rainfall amplification associated with Bilis(0604)

引用

Science China Earth Sciences 2014年第9期57卷 2100-2111页

作者： ren ChenPing cui XiaoPeng Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/Key Laboratory of Meteorological Disaster of Ministry of Education Nanjing University of Information Science & Technology LACS Institute of Atmospheric Physics Chinese Academy of Sciences

After its landfall in China＇s mainland in 2006, Typhoon Bilis brought about torrential rainfall amplification at the edge of Guangdong, Jiangxi, and Hunan provinces, causing severe disasters. From a cloud-microphysical perspective, we discuss the differences of cloud-microphysical processes before and during the precipitation amplification and possible causes of the rain- fall amplification by using high-resolution simulation data. The results show that the cloud-microphysical characteristics dur- ing the above two periods are significantly different. With the distinct increase in the rainfall intensity, the cloud hydrometeor contents increase markedly, especially those of the ice-phase hydrometeors including ice, snow and graupel, contributing more to the surface rainfall. The clouds develop highly and vigorously. Comparisons of conversion rates of the cloud hydrometeors between the above two periods show that the distinct increases in the cloud water content caused by the distinct enhancement of the water vapor condensation rate contribute to the surface rainfall mainly in two ways. First, the rain water content increas- es significantly by accretion of cloud water by rain water, which thus contributes to the surface rainfall. Second, the accretion of cloud water by snow increases significantly the content of snow, which is then converted to graupel by accretion of snow by graupel. And then the graupel melts into rain water, which subsequently contributes to the surface rainfall amplification. In summary, a flow chart is given to clarify the cloud-micropbysical cause of the torrential rainfall amplification associated with Bills.

关键词： landfalling typhoon torrential rainfall amplification cloud microphysics

来源：

维普期刊数据库

同方期刊数据库

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

Graphene-based dual-function acoustic transducers for machine learning-assisted human-robot interfaces

引用

InfoMat 2023年第2期5卷 66-79页

作者： Hao Sun Xin Gao Liang-Yan Guo Lu-Qi Tao Zi Hao Guo Yangshi Shao Tianrui cui Yi Yang Xiong Pu Tian-ling ren Institute of Microelectronics and Beijing National Research Center for Information Science and Technology(BNRist) Tsinghua UniversityBeijingPeople's Republic of China CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-nano Energy and SensorBeijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijingPeople's Republic of China State Key Laboratory of Power Transmission Equipment and System Security and New Technology School of Electrical EngineeringChongqing UniversityChongqingPeople's Republic of China School of Computer Science&Technology Beijing Institute of TechnologyBeijingPeople's Republic of China School of Automation and Electrical Engineering University of Science and Technology BeijingBeijingPeople's Republic of China

Human–robot interface(HRI)electronics are critical for realizing robotic ***,we report graphene-based dual-function acoustic transducers for machine learning-assisted human–robot interfaces(GHRI).The GHRI functions both an artificial ear through the triboelectric acoustic sensing mechanism and an artificial mouth through the thermoacoustic sound emission *** success of the integrated device is also attributed to the multifunctional laser-induced graphene,as either triboelectric materials,electrodes,or thermoacoustic *** systematically optimizing the structure parameters,the GHRI achieves high sensitivity(4500 mV Pa^(–1))and operating durability(1000000 cycles and 60 days),capable of recognizing speech identities,emotions,content,and other information in the human *** the assistance of machine learning,30 speech categories are trained by a convolutional neural network,and the accuracy reaches 99.66%and 96.63%in training datasets and test ***,GHRI is used for artificial intelligence communication based on recognized speech *** work shows broad prospects for the development of robotic intelligence.

关键词： human-robot interface laser-induced graphene machine learning thermoacoustic triboelectric nanogenerator

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

Studying solutions for the fatigue of the FAST cable-net structure caused by the process of changing shape

引用

Research in Astronomy and Astrophysics 2015年第10期15卷 1758-1772页

作者： Peng Jiang ren-Dong Nan Lei Qian You-ling Yue National Astronomical Observatories Chinese Academy of Sciences Key Laboratory of Radio Astronomy

The Five-hundred-meter Aperture Spherical Radio Telescope （FAST） is supported by a cable-net structure, whose change in shape leads to a stress range of approximately 500 MPa. This stress range is more than twice the standard recom- mended value. The cable-net structure is thus the most critical and fragile part of the FAST reflector system. In this study, we first search for a more appropriate deforma- tion strategy that reduces the stress amplitude generated by the process of changing shape. Second, we roughly estimate the tracking trajectory of the telescope during its service life, and conduct an extensive numerical investigation to assess the require- ments for fatigue resistance. Finally, we develop a new type of steel cable system that satisfies the cable requirements for construction of FAST.

关键词： five-hundred-meter aperture spherical radio telescope -- fatigue resis-tance -- astronomical techniques and approaches -- cable-net structure -- finite ele-ment

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

Hydrothermal synthesis method of 5-(4'-methylbiphenyl-2-yl)-1H-tetrazole

引用

Chinese Chemical Letters 2013年第9期24卷 783-785页

作者： Wen-Xiang Wang Hong-ling Cai ren-Gen Xiong Ordered Matter Science Research Center Southeast University

A clean and saIe synthesis method of 5-（4＇-methylbiphenyl-2-yl）-1H-tetrazole was round： under hydrothermal conditions, 1.2 equiv, of 4＇-methylbiphenyl-2-carbonitrile react with 1 equiv, of sodium azide in a mixed solvent of propane-1,2-diol/H2O, with 1.5 equiv, of ammonium chloride and 0.2 equiv. of ammonium fluoride as catalyst. After simple post-processing, the yield can be improved to 95%, and the purity of the product is 99% without further recrystaUization.

关键词： Tetrazole Hydrothermal synthesis Propane-1 2-diol Sartan

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

Sorption and Dissipation of Tetracyclines in Soils and Compost

引用

Pedosphere 2010年第6期20卷 807-816页

作者： LI ling-ling HUANG Li-Dong CHUNG ren-Shih FOK Ka-Hang ZHANG Yong-Song Ministry of Education Key Laboratory of Environmental Remediation and Ecosystem Health College of Natural Resources and Environmental Science Zhejiang University Hangzhou 310029 (China) Department of Agricultural Chemistry National Taiwan University Taipei 10617 (China)

Two agricultural soils were collected from Dahu and Pinchen counties and swine manure compost （SMC） from Pingtung County in Taiwan, China to investigate the sorption and dissipation of three tetracyclines （TCs）, i.e., oxytetracycline （OTC）, tetracycline （TC） and chlortetracycline （CTC）, in compost, soils and soil/compost mixtures with different organic carbon （OC） contents. There were seven treatments in total. TCs were most strongly adsorbed to SMC in all treatments due to the high OC content. When SMC was present in the soils, the sorption of TCs was significantly enhanced, which might be attributed to the increased OC content and CEC. The adsorption of TCs showed non-linear adsorption isotherms and fitted well to the Freundlich model. After 49 d of incubation at 25 ℃ in soils and soil/compost mixtures in the dark, TCs elapsed in all substrates, with the time required for 50% degradation （DT50） between 20 and 41 d, and the time for 90% degradation （DT90） between 68 and 137 d. Soil amended with compost enhanced the stability of TCs and reduced their mobility. The dissipation of TCs in a soil environment was slow, indicating that these compounds might be persistent in soil.

关键词： antibiotics half-life mobility organic carbon soil amendment

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：