检索结果-南通市图书馆

Microstructure and mechanical properties stability of pre-hardening treatment in Al-Cu alloys for pre-hardening forming process

引用

International Journal of Minerals,Metallurgy and Materials 2024年第3期31卷 539-551页

作者： liping tang Pengfei Wei Zhili Hu Qiu Pang Hubei Longzhong laboratory Xiangyang 441000China Hubei Key Laboratory of Advanced Technology for Automotive Components School of Automotive EngineeringWuhan University of TechnologyWuhan 430070China Hubei Engineering Research Center for Green&Precision Material Forming Wuhan University of TechnologyWuhan 430070China Key Laboratory of Metallurgical Equipment and Control Technology of Ministry of Education School of Machinery and AutomationWuhan University of Science and TechnologyWuhan 430081China

The stability of the microstructure and mechanical properties of the pre-hardened sheets during the pre-hardening forming(PHF)process directly determines the quality of the formed components.The microstructure stability of the pre-hardened sheets was in-vestigated by differential scanning calorimetry(DSC),transmission electron microscopy(TEM),and small angle X-ray scattering(SAXS),while the mechanical properties and formability were analyzed through uniaxial tensile tests and formability tests.The results in-dicate that the mechanical properties of the pre-hardened alloys exhibited negligible changes after experiencing 1-month natural aging(NA).The deviations of ultimate tensile strength(UTS),yield strength(YS),and sheet formability(Erichsen value)are all less than 2%.Also,after different NA time(from 48 h to 1 month)is applied to alloys before pre-hardening treatment,the pre-hardened alloys possess stable microstructure and mechanical properties as well.Interestingly,with the extension of NA time before pre-hardening treatment from 48 h to 1 month,the contribution of NA to the pre-hardening treatment is limited.Only a yield strength increment of 20 MPa is achieved,with no loss in elongation.The limited enhancement is mainly attributed to the fact that only a limited number of clusters are transformed into Guinier-Preston(GP)zones at the early stage of pre-hardening treatment,and the formation ofθ''phase inhibits the nucleation and growth of GP zones as the precipitated phase evolves.

关键词： Al-Cu alloy pre-hardened alloy natural aging mechanical properties microstructure

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

Alleviating limit cycling in training GANs with an optimization technique

引用

Science China Mathematics 2024年第6期67卷 1287-1316页

作者： Keke Li liping tang Xinmin Yang National Center for Applied Mathematics in Chongqing Chongqing Normal UniversityChongqing401331China School of Mathematical Sciences University of Electronic Science and Technology of ChinaChengdu611731China

In this paper,we undertake further investigation to alleviate the issue of limit cycling behavior in training generative adversarial networks(GANs)through the proposed predictive centripetal acceleration algorithm(PCAA).Specifically,we first derive the upper and lower complexity bounds of PCAA for a general bilinear game,with the last-iterate convergence rate notably improving upon previous results.Then,we combine PCAA with the adaptive moment estimation algorithm(Adam)to propose PCAA-Adam,for practical training of GANs to enhance their generalization capability.Finally,we validate the effectiveness of the proposed algorithm through experiments conducted on bilinear games,multivariate Gaussian distributions,and the CelebA dataset,respectively.

关键词： GANs general bilinear game predictive centripetal acceleration algorithm lower and upper complexity bounds PCAA-Adam

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

Taming quantum dots’nucleation and growth enables stable and efficient blue-light-emitting devices

引用

Photonics Research 2022年第10期10卷 2359-2365页

作者： ZHIWEI MA JUNXIA HU liping tang BINGBING LYU Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Key Laboratory for Special Functional Materials of the Ministry of Education Henan UniversityKaifeng 475004China School of Information Engineering Xinyang Agriculture and Forestry UniversityXinyang 464000China Department of Physics South University of Science and TechnologyShenzhen 518055China

Controlling quantum dots’emission,nanostructure,and energy level alignment to achieve stable and efficient blue emission is of great significance for electroluminescence devices but remains a challenge.Here,a series of blue ZnCdSeS/ZnS quantum dots was optimized in preparation by taming their nucleation and growth kinetics.Controlling anion precursor reactive properties to modulate quantum dots’nucleation and growth tailors their alloy core and continuous gradient energy band nanostructure.These results not only elevate the thermal stability of blue quantum dots but also further enhance the injection/transportation of carriers and improve the radiative recombination efficiency in the device.The blue ZnCdSeS/ZnS quantum dots applied in light-emitting devices show superior performance,including maximum current efficiency and external quantum efficiency of,respectively,8.2 cd/A and 15.8%for blue,2.6 cd/A and 10.0%for blue-violet,and 10.9 cd/A and 13.4%for sky-blue devices.The blue and sky-blue devices exhibit lifetimes of more than 10,000 h.The proposed methodology for tailoring quantum dots is expected to pave new guidelines for further facilitating visible optoelectronic device exploration.

关键词： quantum blue enable

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

Metagenomics reveals contrasting energy utilization efficiencies of captive and wild camels(Camelus ferus)

引用

Integrative Zoology 2022年第3期17卷 333-345页

作者： liping YAN liping tang Zhichao ZHOU Wei LU Bo WANG Zhicheng SUN Xue JIANG Defu HU Junqing LI Dong ZHANG School of Ecology and Nature Conservation Beijing Forestry UniversityBeijingChina Gansu Endangered Animals Protection Center WuweiChina Administrative Bureau of Dunhuang Xihu National Nature Reserve DunhuangChina

Captive conditions can affect the symbiotic microbiome of animals.In this study,we compared the structural and functional differences of the gastrointestinal microbiomes of wild Bactrian camels(Camelus ferus)between wild and captive populations,as well as their different host energy utilization performances through metagenomics.The results showed that wild-living camels harbored more microbial taxa related to the production of volatile fatty acids,fewer methanogens,and fewer genes encoding enzymes involved in methanogenesis,leading to higher energy utilization efficiency compared to that of captive-living camels.These findings suggest that the wild-living camel fecal microbiome demonstrates a series of adaptive characteristics that enable the host to adjust to a relatively barren field environment.Our study provides novel insights into the mechanisms of wildlife adaptations to habitats from the perspective of the microbiome.

关键词： adaptability energy utilization gastrointestinal microbiome metagenomics wild and captive wild Bactrian camel

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

Gut microbial community structure and function of Przewalski’s horses varied across reintroduced sites in China

引用

Integrative Zoology 2023年第6期18卷 1027-1040页

作者： liping tang liping YAN Huiping JIA Yu XIONG Xinping MA Hongjun CHU Zhicheng SUN Liang WANG Mubalake SHALITANATI Kai LI Defu HU Dong ZHANG School of Ecology and Nature Conservation Beijing Forestry UniversityBeijingChina Xinjiang Mountain Ungulate Nature Reserve Management Center UrumqiChina Institute of Forestry Ecology Xinjiang Academy of Forestry SciencesUrumqiChina Administrative Bureau of Dunhuang Xihu National Nature Reserve DunhuangChina Administration of Gansu Anxi Extra-arid Desert National Nature Reserve GuazhouChina School of Life Sciences Lanzhou UniversityLanzhouChina Xinjiang Uygur Autonomous Region Wild Horse Breeding Research Center UrumqiChina

Host-associated microbiota can significantly impact host fitness.Therefore,naturally occurring variations in microbiota may influence the health and persistence of their hosts.This finding is particularly important in reintroduced animals,as they typically experience habitat changes during translocations.However,little is known about how microbiomes are altered in response to conservation translocation.Here,we accessed the gut microbiome of Przewalski’s horse(Equus przewalskii)populations in China from three nature reserves(i.e.Xinjiang Kalamaili Nature Reserve,KNR;Dunhuang Xihu National Nature Reserve,DXNNR;and Anxi Extreme-arid Desert Nature Reserve,AENR)using 16s rRNA gene and metagenome sequencing.The results showed that the microbial composition and function differed significantly across locations,while a subset of core taxa was consistently present in most of the samples.The abundance of genes encoding microbe-produced enzymes involved in the metabolism of carbohydrates,especially for glycoside hydrolases,was significantly higher in open-spaced KNR populations than in more confined AENR individuals.This study offers detailed and significant differential characters related to the microbial community and metabolic pathways in various reintroduced sites of Przewalski’s horse,which might provide a basis for future microecological and conservation research on endangered reintroduced animals.

关键词： 16s rRNA gene metagenome microbial variation reintroduction

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

Effects of irrigation level and method on soil salt balance and crop water use efficiency in arid oasis regions

引用

International Journal of Agricultural and Biological Engineering 2023年第6期16卷 158-166页

作者： liping tang Xueshuang Shi Zhipeng Song Han Zhao Fahu Li College of Water Resources and Civil Engineering China Agricultural UniversityBeijing 100083China Shigatse Institute of Agricultural Sciences Shigatse 857000TibetChina

Fresh water resource scarcity and soil salt accumulation in the root-zone are two key limiting factors for sustainable agricultural development in the oasis region of arid inland basin, northwest China. The aim of this study was to explore an appropriate irrigation scheme to maintain sustainable crop cultivation in this region. The effects of four irrigation levels (full irrigation, mild deficit, moderate deficit, and severe deficit) and three irrigation methods (border, surface drip and subsurface drip) on soil water and salt dynamics, highland barley (Hordeum vulgare L.) yield, and crop water use efficiency were studied by field plot experiments. The results showed that soil salt in 0-100 cm profile was accumulated under all experimental treatments after one season of highland barley planting, but the accumulated salt mass decreased with the decrease of the lower limit of irrigation. Salt mass in 0-100 cm soil profile under subsurface drip irrigation was 16.8%-57.8% and 2.9%-58.4% less than that under border and surface drip irrigation, respectively. The grain yield of highland barley decreased first and then increased with the decrease of the lower limit of irrigation under surface drip and subsurface drip irrigation, but it was on the contrary under border irrigation. Mean grain yield for all irrigation levels under subsurface drip irrigation was 5.7% and 18.8% higher than that under border and surface drip irrigation, respectively. Water use efficiency increased with the decrease of the lower limit of irrigation, and the averaged water use efficiency of all irrigation levels under subsurface drip irrigation was 11.9% and 14.2% higher than that under border and surface drip irrigation, respectively. Considering economic benefit and irrigation water requirement, subsurface drip irrigation with the lower limit of irrigation of 50%-55% field capacity is suggested for highland barley planting in the arid oasis region.

关键词： arid oasis highland barley irrigation method irrigation level soil salt balance water use efficiency

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

Study of K/Mn-MgO Supported Fe Catalysts with Fe（CO）5 and Fe（NO3）3 as Precursors for CO Hydrogenation to Light Alkenes

引用

Chinese Journal of Chemistry 2013年第10期31卷 1263-1268页

作者： liping tang Chengli Song Mengli Li Xiaolong Yang Bin Hu State Key Laboratory for Oxo Synthsis and Selective Oxidation Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou Gansu 730000 China University of Chinese Academy of Sciences Beijing 100049 China

Two K/Mn-MgO supported catalysts were prepared by Fe（CO）5 and Fe（NO3）3 as precursor respectively. The obtained Fe-K/Mn-MgO catalysts were tested for CO hydrogenation to light alkenes and characterized by X-ray powder diffraction （XRD）, X-ray photoelectron spectra （XPS）, H2 temperature-programmed reduction （H2-TPR）, H2 CO and CO2 temperature-programmed desorption （H2, CO/CO2-TPD） and transmission electron microscope （TEM） The results indicated that the catalyst with 10 wt% Fe loading prepared by Fe（CO）5 as precursor showed better performance in syngas to light alkenes than ones obtained from Fe（NO3）3 as precursor, where the CO conversion was 62.50% and the selectivity was 55.95% at 350 ℃, 1.5 MPa and 1000 h^-1, respectively.

关键词： iron precursor light alkenes CO conversion selectivity

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

On the formation of limit cycle of the friction-induced stick-slip vibration in oilwell drillstring

引用

Petroleum 2015年第1期1卷 63-67页

作者： Xiaohua Zhu liping tang School of Mechatronic Engineering Southwest Petroleum UniversityChengdu 610500China

In this paper,the stick-slip vibration in oilwell drillstring is studied.The drilling system is modelled as a lumped-parameter torsional pendulum and the interaction between the drill bit and the rock is treated as Coulomb friction.Equation of motion of the drill bit is established and the dynamic responses of the drill bit are obtained.A drilling system with the drillstring length 3000 m is analysed,in which the system parameters are selected by reference to the actual drilling situation.After the slip vibrations in the initial stage,final state of the drill bit is a stable stick-slip vibration of which the limit cycle is a closed loop.In order to find the stability of the limit cycle corresponds to the periodically stick-slip vibration,different initial conditions for the drill bit are studied.Results show that the drill bit will lead to a periodic motion and the phase trajectories ultimately converge to the same limit cycle corresponds to stable stick-slip vibration.

关键词： Stick-slip vibration Friction Drillstring Drill bit Limit cycle

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

Biofunctionalization of metallic implants by calcium phosphate coatings

引用

Bioactive Materials 2019年第1期4卷 196-206页

作者： Yingchao Su Irsalan Cockerill Yufeng Zheng liping tang Yi-Xian Qin Donghui Zhu Department of Biomedical Engineering University of North TexasDentonTXUSA Department of Materials Science and Engineering College of EngineeringPeking UniversityBeijingChina Department of Bioengineering University of Texas at ArlingtonArlingtonTXUSA Department of Biomedical Engineering Stony Brook UniversityStony BrookNYUSA

Metallic materials have been extensively applied in clinical practice due to their unique mechanical properties and durability.Recent years have witnessed broad interests and advances on surface functionalization of metallic implants for high-performance biofunctions.Calcium phosphates(CaPs)are the major inorganic component of bone tissues,and thus owning inherent biocompatibility and osseointegration properties.As such,they have been widely used in clinical orthopedics and dentistry.The new emergence of surface functionalization on metallic implants with CaP coatings shows promise for a combination of mechanical properties from metals and various biofunctions from CaPs.This review provides a brief summary of state-of-art of surface biofunctionalization on implantable metals by CaP coatings.We first glance over different types of CaPs with their coating methods and in vitro and in vivo performances,and then give insight into the representative biofunctions,i.***.osteointegration,corrosion resistance and biodegradation control,and antibacterial property,provided by CaP coatings for metallic implant materials.

关键词： Calcium phosphates Metallic implant materials Surface biofunctionalization Osteointegration Biodegradation

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

黄芪桂枝五物汤加味对行PCI术治疗的急性心肌梗死患者冠状动脉再灌注及心肌损伤的影响

引用

反射疗法与康复医学 2024年第1期5卷 32-35页

作者：唐利萍宜兴市中医医院心内科江苏宜兴214200

目的探究行经皮冠状动脉介入(PCI)术治疗的急性心肌梗死(AMI)患者采用黄芪桂枝五物汤加味治疗对其冠状动脉再灌注及心肌损伤的影响.方法选择2020年7月—2023年7月于宜兴市中医医院行PCI术治疗的70例AMI患者为研究对象,按随机数字表法将... 详细信息

目的探究行经皮冠状动脉介入(PCI)术治疗的急性心肌梗死(AMI)患者采用黄芪桂枝五物汤加味治疗对其冠状动脉再灌注及心肌损伤的影响.方法选择2020年7月—2023年7月于宜兴市中医医院行PCI术治疗的70例AMI患者为研究对象,按随机数字表法将其分为对照组及观察组,每组35例.对照组采用西医常规治疗,观察组在此基础上采用黄芪桂枝五物汤加味治疗,均持续4周.对比两组患者的冠状动脉再灌注情况、心肌损伤情况及心功能.结果治疗后,观察组的冠状动脉再灌注情况优于对照组,差异有统计学意义(P﹤0.05);观察组的心肌肌钙蛋白I、肌酸磷化酶-同工酶水平分别为(0.91±0.05)μg/L、(51.77±2.16)U/L,均低于对照组,组间差异有统计学意义(P﹤0.05);观察组的左心室收缩末期内径、左心室舒张末期内径分别为(40.29±1.94)mm、(51.03±1.95)mm,均短于对照组,左心室射血分数为(76.31±3.55)%,高于对照组,组间差异有统计学意义(P﹤0.05).结论黄芪桂枝五物汤加味能改善行PCI术治疗的AMI患者的冠状动脉再灌注情况及心功能,减轻心肌损伤.

关键词：急性心肌梗死经皮冠状动脉介入黄芪桂枝五物汤加味冠状动脉再灌注心肌损伤心功能

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

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：