检索结果-南通市图书馆

Enhanced mechanical properties of a carbon and nitrogen co-doped interstitial high-entropy alloy via tuning ultrafine-grained microstructures

引用

Journal of Materials Science & Technology 2023年第13期144卷 128-137页

作者： Wei Jiang Heng Wang zhiming li Yonghao Zhao Nano and Heterogeneous Materials Center School of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing210094PR.China School of Materials Science and Engineering Central South UniversityChangsha410083PR.China

C-N co-doped interstitial high entropy alloy(iHEA)was reported to have high strength and ***,iHEA with fully recrystallized ultrafine grains(UFGs)and underlying thermally activated pro-cesses associated with dislocation slip,twinning,and solute drag have not been reported *** this work,a C-N co-doped iHEA with nominal composition Fe_(48.5)Mn_(30)Co_(10)Cr_(10)C_(0.5)N_(1.0)(at.%)was prepared,and the microstructures were tuned by cold-rolling and annealing treatments to improve mechanical *** cold-rolling with a strain of 1.74,the main microstructures in the iHEA are composed of nano-grains,nano-twins,HCP laminates,and high density of dislocations,leading to ultrahigh hardness of 466.7 HV and tensile strength of 1730 MPa at the expense of ductility(2.44%).Both the nanostructures and the high hardness of the iHEA can be maintained up to an annealing temperature of 600℃(462.5 HV).After annealing at 650℃ for 1 h,the UFG microstructures are obtained in the iHEA,containing re-crystallized grains with an average grain size of 0.91μm and nanoprecipitates with an average diameter of 90.8 *** combined strengthening and hardening effects of UFGs,nanoprecipitates,twinning,and solutes contribute to high strain hardening(n=0.81),gigapascal yield strength(984 MPa),and good duc-tility(20%).The C-N co-doping leads to a strong drag effect on dislocation slip,resulting in a nano-scale mean free path of dislocation slip λ(1.44 nm)and much small apparent activation volume V^(∗)(15.8 b^(3))of the UFG iHEA.

关键词： Ultrafine-grained high-entropy alloys Interstitial atoms Thermomechanical processing Microstructures Mechanical properties

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

Cryogenic mechanical behavior of a TRIP-assisted dual-phase highentropy alloy

引用

Nano Research 2022年第6期15卷 4859-4866页

作者： Dongyue li zhiming li Lu Xie Yong Zhang Wenrui Wang School of Mechanical Engineering University of Science and Technology BeijingBeijing 100083China School of Materials Science and Engineering Central South UniversityChangsha 410083China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China

The recently developed dual-phase(DP)non-equiatomic Fe_(50)Mn_(30)Co_(10)Cr_(10)(at.%)high-entropy alloy(HEA)showed much higher strength and ductility compared to the single-phase equiatomic Fe_(20)Mn_(20)Ni_(20)Co_(20)Cr_(20)(at.%)HEA at room *** we probe the cryogenic mechanical properties of the non-equiatomic DP-HEA with different grain sizes and compare with the equiatomic single-phase *** results show that the cryogenic ultimate tensile strengths of the coarse-grained(~200μm)and fine-grained(~4μm)DP-HEAs reach up to 1,133 and 1,342 MPa,respectively,which are significantly higher than that of the equiatomic single-phase HEAs with similar grain ***,the fine-grained DP-HEA shows substantial improvement in both strength and ductility compared to the coarse-grained counterparts at cryogenic *** analysis reveals that the enhanced mechanical properties of the DP-HEA at cryogenic temperatures are attributed to a more extensive displacive transformation from the face-centered cubic(FCC)matrix into the hexagonal close-packed(HCP)phase compared to that at room ***,the HCP phase fraction in tensile tested fine-grained DP-HEAs increases from~39%to~79%with decreasing temperature from 298 to 77 *** enhanced transformation behavior is enabled by the reduced stacking fault energy of the material with the decrease of deformation *** resulting outstanding combination of strength and ductility further suggests that the DP-HEAs are promising candidates as structural materials for cryogenic applications.

关键词： high-entropy alloy cryogenic mechanical behavior grain size dual phase phase transformation

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

Dynamic Modeling of Robotic Manipulator via an Augmented Deep Lagrangian Network

引用

Tsinghua Science and Technology 2024年第5期29卷 1604-1614页

作者： Shuangshuang Wu zhiming li Wenbai Chen Fuchun Sun School of Automation Beijing Information Science and Technology UniversityBeijing 100192China Department of Computer Science and Technology Tsinghua UniversityBeijing 100084China

Learning the accurate dynamics of robotic systems directly from the trajectory data is currently a prominent research *** physics-enforced networks,exemplified by Hamiltonian neural networks and Lagrangian neural networks,demonstrate proficiency in modeling ideal physical systems,but face limitations when applied to systems with uncertain non-conservative dynamics due to the inherent constraints of the conservation laws *** this paper,we present a novel augmented deep Lagrangian network,which seamlessly integrates a deep Lagrangian network with a standard deep *** fusion aims to effectively model uncertainties that surpass the limitations of conventional Lagrangian *** proposed network is applied to learn inverse dynamics model of two multi-degree manipulators including a 6-dof UR-5 robot and a 7-dof SARCOS manipulator under *** experimental results clearly demonstrate that our approach exhibits superior modeling precision and enhanced physical credibility.

关键词： deep Lagrangian network nonconservative dynamics multi-degree manipulator inverse dynamic modeling

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

计及沼气重整制氢和燃气掺氢的综合能源系统优化调度

引用

三峡大学学报（自然科学版） 2025年第1期47卷 89-98页

作者：王守文袁莹超徐丽洁叶金根李国祥李志明三峡大学法学与公共管理学院湖北宜昌443002 三峡大学电气与新能源学院湖北宜昌443002 三峡大学经济与管理学院湖北宜昌443002 国家电网宜昌市高新区供电公司湖北宜昌443000

为推动氢能多元生产和利用,提出一种计及沼气重整制氢和燃气掺氢的综合能源系统优化调度模型.首先,构建沼气重整制氢模型,满足天然气负荷的同时,实现生物天然气制氢.其次,将电解水和沼气重整产生的氢气联合,探究沼气重整制氢对系统经济... 详细信息

为推动氢能多元生产和利用,提出一种计及沼气重整制氢和燃气掺氢的综合能源系统优化调度模型.首先,构建沼气重整制氢模型,满足天然气负荷的同时,实现生物天然气制氢.其次,将电解水和沼气重整产生的氢气联合,探究沼气重整制氢对系统经济性、低碳性的影响.然后,生成的氢气供给氢燃料电池、掺氢燃气轮机,并引入阶梯碳交易机制,限制系统碳排放.最后,以日运行总成本最低为目标函数,设置4种不同场景进行仿真分析.仿真结果表明:所提模型总成本降低5.33%,碳排放量降低5.17%;合适的秸秆价格有利于消纳风光和利用生物质能;燃气轮机适度掺氢燃烧可以进一步降低总成本和碳排放量.

关键词：沼气重整制氢电解水制氢燃气掺氢阶梯碳交易低碳经济调度

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

Multi-parametric geochemical survey on evaluation of hydrocarbon potential of trap structure in a desert area: A case of TD-2 structure in the Tarim Basin, China

引用

Chinese Journal Of Geochemistry 2011年第1期30卷 99-106页

作者： li zhiming ZHANG Changjiang SONG Xilin Institute of Experimental Petroleum Geology RIPEP SINOPEC Wuxi 214151 China Department of Integrative Geophysical and Geochemical Exploration BGP Zhuozhou 072751 China

TD-2 structure is located in the eastern part of the Central Uplift zone of the Tarim Basin, China. It is a basement-uplift anticline-type structure confirmed by seismic and gravity prospecting, and it is expected to have good potential for oil and gas according to the analysis of regional geological evolution history. But further exploration such as drilling is suspended because of lacking direct geochemical information. Therefore, multi-parametric geochemical surveys, such as free hydrocarbons (C1-C5), acid hydrocarbons (C1-C5) and ?C, Hg of soil, were conducted. It is concluded in this paper that free hydrocarbons are obviously better than other geochemical parameters and could be used for evaluation of oil and gas potential of TD-2 structure in the desert area. Shapes of near-surface geochemical anomalies and geochemical characteristic parameters suggested that TD-2 structure was a dry gas-bearing structure at the early-middle dissipation stage. So TD-2 structure should have some promising potential for oil-gas. Multi-parametric geochemical survey provided important information for further drilling exploration.

关键词：地球化学调查耗散结构塔里木盆地潜力评价沙漠地区 TD 油气圈闭中国

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

Ore-forming material sources of the Baiyangping Cu-Co-Ag polymetallic deposit in the Lanping Basin,western Yunnan Province

引用

Chinese Journal Of Geochemistry 2008年第3期27卷 217-224页

作者： li zhiming liU Jiajun ZHANG Changjiang Wuxi Research Institute of Petroleum Geology RIPED SINOPEC Wuxi 214151 China China University ofGeosciences Beijing 100083 China

The ore-forming material sources of the Baiyangping copper-cobalt-silver polymetallic deposit have been studied in view of the S, Pb, C, O and H isotopic characteristics and the ratio of Co/Ni of cobaltite. The results showed that sulfur in metallic sulfides may have come from a mixed sulfur-source consisting of the sulfur-source from metamorphic rocks in the basin basement with basic volcanic rocks and the sulfur-source from basin sulfates; lead in the ores was provided by the sedimentary rocks and basement rocks; CO2 in ore-forming fluids was derived from thermolysis of altered and normal marine facies carbonates and decarboxylation of sedimentary organic matter respectively; the ore-forming fluids belong to the SO4-Cl-Na-Ca-type basin thermal brines derived from paleo-meteoric waters; cobalt in the deposit may also be derived from the metamorphic rocks in the basin basement with basic volcanic rocks.

关键词：矿石金属铜钴银沉淀

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

UV-LED/P25-based photocatalysis for effective degradation of isothiazolone biocide

引用

Frontiers of Environmental Science & Engineering 2021年第5期15卷 97-108页

作者： Xinzheng li zhiming li Zhihui Xing Zhimin Song Bei Ye Zhengming Wang Qianyuan Wu Key Laboratory of Microorganism Application and Risk Control of Shenzhen Guangdong Provincial Engineering Research Center for Urban Water Recycling and Environmental SafetyInternational Graduate School at ShenzhenTsinghua UniversityShenzhen518055China China Shenzhen Environmental Science and New Energy Technology Engineering Laboratory Tsinghua-Berkeley Shenzhen InstituteShenzhen518055China Environmental Management Research Institute National Institute of Advanced Industrial Science and Technology16-1 OnogawaTsukubaIbaraki305-8569Japan

In this work,LED-based photocatalysis using mixed rutile and anatase phase TiO_(2)(P25)as the photocatalyst could effectively remove 5-chloro-2-methyl-4-isothiazolin-3-one(CMIT)and methylisothiazolone(MIT)simultaneously,with removal efficiencies above 80%within 20 *** photocatalytic degradation of both CMIT and MIT could be modeled using a pseudo-first-order rate *** photocatalytic degradation rates of CMIT and MIT under LED280 illumination were higher than under LED310 or LED360 *** concentrations below 100 mg/L,the degradation rate of CMIT and MIT under LED illumination significantly increased with increasing catalyst ***,the effects of the chloride ion concentration,alkalinity and dissolved organic matter on the photocatalytic degradation reaction were also ***·OH free radicals were determined to play the primary role in the photocatalytic degradation reaction,with a degradation contribution of>95%.The photocatalytic degradation of CMIT and MIT mainly occurred via oxidation,hydrolysis,and chain growth ***,the possible photocatalytic degradation pathways of CMIT and MIT over LED/P25 are proposed.

关键词： Degradation Photocatalytic LED CMIT P25

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

Ce-modified USY zeolite catalysts for catalytic oxidation of chlorinated VOCs:Effect of the location of CeO_(2) and its synergistic effect with USY zeolite

引用

Journal of Rare Earths 2024年第11期42卷 2068-2077,I0003页

作者： Xiaolin Guo zhiming li Ang Zhou Yijun Shi Yong Wang Renxian Zhou Institute of Catalysis Zhejiang UniversityHangzhou310028China College of Materials and Chemistry China Jiliang UniversityHangzhou310018China

The catalytic behavior of a catalyst for chlorine-containing volatile organic compounds(CVOCs) oxidation largely depends on the synergistic interaction between the oxidizing and acidic *** the present work,two catalysts with different distributions of CeO_(2) on the inner and outer surfaces of 4.0Ce-USY-ex and 4.0Ce-USY-dp(USY zeolite) were prepared respectively by ion exchange and deposition methods,with a purpose of finding out how the location of the oxidation sites(CeO_(2)) influence its synergistic effect with the acidic sites of *** results show that 4.0Ce-USY-ex is much more active for catalytic degradation of 1,2-dichloroethane(DCE),while 4.0Ce-USY-dp catalyst exhibit higher catalytic degradation activity for other structured CVOCs(dichloromethane(DCM),trichloroethylene(TCE),chlorobenzene(CB)).CeO_(2) in 4.0Ce-USY-ex catalyst mainly disperses in the pore channels of USY zeolite,and there are many strong acid centers on the surface,which is conducive to the dechlorination conversion of ***,CeO_(2) in 4.0Ce-USY-dp catalyst is mainly distributed on the outer surface of USY and has strong oxidation ability,which contributes to the deep oxidation of ***,the presence of a large number of strong acid centers on the catalyst surface of 4.0Ce-USY-ex catalysts leads to severe accumulation of surface carbon species and significantly decreases its stability towards ***,a large number of active oxygen species on the surface of 4.0Ce-USY-dp and CeO_(2) catalysts are beneficial to the deep oxidation of DCE,reducing the formation of surface carbon and thus improving the stability of the ***,the influence of the location of the oxidation sites on its synergistic effect with the acidic sites was established in the present work,which could provide some new ideas for the rational design of CVOCs degradation catalyst with appropriate distribution of active sites.

关键词： CVOCs oxidation CeO_(2) USY Location Synergistic effect Rare earths

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

Microstructure Modification and Ductility Improvement for TaMoNbZrTiAl Refractory High Entropy Alloys via Increasing Ti Content

引用

Acta Metallurgica Sinica(English Letters) 2024年第7期37卷 1186-1200页

作者： Yujing Zhou Siyi Peng Yueling Guo Xiaoxiang Wu Changmeng liu zhiming li School of Mechanical Engineering Beijing Institute of TechnologyBeijing100081China Shagang School of Iron and Steel Soochow UniversitySuzhou215137China School of Materials Science and Engineering Central South UniversityChangsha410083China

Here, the composition of TaMoNbZrTiAl refractory high entropy alloy (RHEA) is optimized by increasing Ti content to improve its mechanical property especially the ductility, through comparing two RHEAs with different Ti content. The RHEAs contain two body-centered-cubic (BCC) phases. The BCC phase in the dendritic region is rich in Ta, Mo and Nb, and the BCC phase in the interdendritic region is enriched in Zr, Ti and Al. The as-cast RHEA with a higher Ti content remains dendritic microstructures, and Ti is mainly enriched in the interdendritic region. After annealing treatment at 1300 ℃ for 48 h, the dendritic microstructures change into equiaxed-grain morphology, accompanied by needle-like micron precipitates at grain boundaries in the RHEA with higher Ti content. For the as-cast RHEAs, the fracture strain increases by ~ 6.6% and the uniform plastic strain increases by ~ 5.9% at the compression test due to the increase of Ti content. Our work offers a reference for the composition design of RHEAs and makes a preliminary exploration of the optimization of the microstructures and mechanical properties.

关键词： Refractory high entropy alloys Solidification Grain morphology Microstructure Mechanical property

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

STING-activating drug delivery systems:Design strategies and biomedical applications

引用

Chinese Chemical Letters 2021年第5期32卷 1615-1625页

作者： Chunying li Yifan Zhang Yilin Wan Jingle Wang Jing lin zhiming li Peng Huang Department of Dermatology and Venereology The First Affiliated Hospital of Wenzhou Medical UniversityWenzhou 325000China Marshall Laboratory of Biomedical Engineering International Cancer CenterLaboratory of Evolutionary Theranostics(LET)School of Biomedical EngineeringShenzhen University Health Science CenterShenzhen 518060China Department of Medical Oncology The Third Affiliated Hospital of Shanghai UniversityWenzhou 325000China

The stimulator of interferon genes(STING)shows promising clinical activity in infectious diseases and ***,the lack of targeting capability and intracellular stability of STING agonists severely limits the therapeutic ***,drug delivery systems(DDSs)overcome these delivery barriers of STING agonists via passive or active cell targeting,prolonged blood circulation and drug release,and lysosome escape,*** this review,we will describe in detail how existing DDSs are designed to overcome delivery barriers and activate the STING pathway,and the current biomedical applications of STING-activating DDSs in the treatments of infectious diseases and ***,the prospects and challenges of DDSs in STING activation are discussed.

关键词： STING agonist Drug delivery system Cancer treatment Anti-virus treatment Immunotherapy

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：