检索结果-南通市图书馆

m.ch.nical beh.vior and dam.ge constitutive m.del of sandstone under h.dro-m.ch.nical (h.m. coupling

International Journal of m.ning Science and Tech.ology 2024年第6期34卷 837-853页

作者： Tao tan Ch.nyang Zh.ng Yanlin Zh.o Xiaosh.ang Li Sch.ol of Resources and Environm.ntal Engineering Wuhan University of TechnologyWuhan 430070China State Key Laboratory of Safety and h.alth.in m.tal m.nes Maanshan 243000China Sinosteel m.ansh.n General Institute of m.ning Research.Co. Ltd.Maanshan 243000China Sch.ol of Resource&Environm.nt and Safety Engineering Hunan University of Science and TechnologyXiangtan 411201China Sch.ol of Urban Construction Changzhou UniversityChangzhouJiangsu 213164China

Underground engineering often passes th.ough.water-rich.fractured rock m.sses, wh.ch.are prone to fracture and instability under th. long-term.coupling of in-situ stress field and pore water(P-W) pressure, ultim.tely th.eatening th. stability of underground structures. In order to explore th. m.ch.nical properties of rocks under h.m.coupling, th. corresponding dam.ge constitutive(D-C) m.del h.s becom. th. focus of attention. Considering th. inadequacy of th. current research.on rock strength.param.ters,energy evolution ch.racteristics and D-C m.del under h.m.coupling, th. m.ch.nical properties of typical sandstone sam.les are discussed based on laboratory tests. Th. results sh.w th.t th. variation of ch.racteristic stresses of sandstone under h.m.coupling conform. to th. norm.lized attenuation equation and m.h.-Coulom.(m.C) criterion. Th. P-W pressure m.ch.nism.of sandstone exh.bits a dynam.c ch.nge from.softening effect to h.m.fracturing effect. Th. closure stress is m.inly provided by coh.sive strength. wh.le th. initiation stress, dam.ge stress, and peak stress are jointly dom.nated by coh.sive strength.and friction strength. In addition, residual stress is attributed to th. friction strength.form.d by th. bite of th. fracture surface. Subsequently, th. energy evolution ch.racteristics of sandstone under h.m.coupling were studied, and it was found th.t P-W pressure weakened th. energy storage capacity and energy dissipation capacity of sandstone, and h.m.fracturing was an im.ortant factor in reducing its energy storage efficiency. Finally, com.ined with.energy dissipation th.ory and statistical dam.ge th.ory, two types of D-C m.dels considering P-W pressure are proposed accordingly, and th. m.del param.ters can be determ.ned by four m.th.ds. Th. application results indicate th.t th. proposed and m.dified D-C m.dels h.ve h.gh.reliability, and can ch.racterize th. m.ch.nical beh.vior of sandstone under h.m.coupling, overcom. th. inconvenience of existing D-C m.dels

关键词： h.m.coupling Water-saturated sandstone m.ch.nical m.ch.nism Energy evolution D-C m.del

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 cold-working on corrosion induced dam.ge in lug joints

引用

Defence Tech.ology（防务技术） 2024年第6期36卷 175-182页

作者： Ram.nath.m.N Ch.km.th.L. m.rth. h. Departm.nt of Aerospace Engineering Indian Institute of Technology-MadrasChennai 600036India Departm.nt of Aeronautical Engineering KLS Gogte Institute of TechnologyBelagavi 590008India

Lug joints are preferred joineries for transferring h.avy loads to parent com.onents in aerospace *** experience corrosion due to environm.ntal conditions,im.roper surface finish.s and rubbing displacem.nt between th. pin and *** causes dam.ge of different sizes and sh.pes near th. *** degradation due to corrosion-induced dam.ge is m.delled as a th.ough.pit at one of th. identified critical locations th.ough.stress *** effect of th.s pit on fatigue crack initiation life is ***-h.le is pre-stressed by cold-working and th. benefits of inducing plastic wake on th. intended perform.nce of th. lug joint during th. dam.ges due to corrosion are brough. out and com.ared with.non-cold-worked *** analysis is perform.d on th.s lug joint with.*** results obtained h.gh.igh. th. benefits of cold-working and th. m.th.dology can be extended to dam.ge growth.and analyse th. effect of surface treatm.nts for better structural integrity of com.onents of aerospace veh.cles.

关键词： Lug joint Corrosion Crack initiation Cold-working Structural integrity

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

Free vibration and buckling analysis of polym.ric com.osite beam. reinforced by functionally graded bam.oo fbers

引用

Applied m.th.m.tics and m.ch.nics(English.Edition) 2024年第3期45卷 543-562页

作者： h.m.FEIZABAD m.h.YAS Departm.nt of m.ch.nical Engineering Razi UniversityKermanshah ***Iran

Natural fibers h.ve been extensively research.d as reinforcem.nt m.terials in polym.rs on account of th.ir environm.ntal and econom.c advantages in com.arison with.synth.tic fibers in th. recent *** fibers are renowned for th.ir good m.ch.nical properties,abundance,and sh.rt cycle *** beam. are one of th. fundam.ntal structural com.onents and are susceptible to m.ch.nical loads in engineering applications,th.s paper perform. a study on th. free vibration and buckling responses of bam.oo fiber reinforced com.osite(BFRC)beam. on th. elastic *** different functionally graded(FG)layouts and a uniform.one are th. considered distributions for unidirectional long bam.oo fibers across th. *** elastic properties of th. com.osite are determ.ned with.th. law of *** h.m.lton’s principle,th. governing equations of m.tion are *** generalized differential quadrature m.th.d(GDQm.is th.n applied to th. equations to obtain th. *** ach.eved outcom.s exh.bit th.t th. natural frequency and buckling load values vary as th. fiber volum. fractions and distributions,elastic foundation stiffness values,and boundary conditions(BCs)and slenderness ratio of th. beam.***,a com.arative study is conducted between th. derived analysis outcom.s for BFRC and h.m.genous polym.r beam. to exam.ne th. effectiveness of bam.oo fibers as reinforcem.nt m.terials,dem.nstrating th. significant enh.ncem.nts in both.vibration and buckling responses,with.th. exception of natural frequencies for cantilever beam. on th. Pasternak foundation with.th. FG-◇fiber ***,th. obtained analysis results of BFRC beam. are also com.ared with.th.se for carbon nanotube reinforced com.osite(CNTRC)beam. found in th. literature,indicating th.t th. buckling loads and natural frequencies of BFRC beam. are lower th.n th.se of CNTRC beam..

关键词： bam.oo fiber free vibration buckling analysis functionally graded(FG)beam elastic foundation generalized differential quadrature m.th.d(GDQm.

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

Am.rph.us h.brid tungsten oxide–nickel h.droxide nanosh.ets used as a h.gh.y efficient electrocatalyst for h.drogen evolution reaction

引用

Nano Research 2024年第4期17卷 2499-2508页

作者： Ch.o Lyu Ch.ngh.i Dai Yiwei tan State Key Laboratory of m.terials-Oriented Ch.m.cal Engineering School of Chemistry and Chemical EngineeringNanjing Tech UniversityNanjing 211816China

Th.re are m.re ch.llenges for alkaline h.drogen evolution reaction(h.R)via sim.ltaneously expediting th. electron-coupled water dissociation process(Volm.r step)and th. following electroch.m.cal h.(2) desorption(h.yrovsky step).h.brid am.rph.us electrocatalysts are h.gh.y desirable for efficient h.drogen evolution from.water-alkali electrolyzers due to th. bifunctionality for th. different elem.ntary steps of h.R and optim.l interactions with.water m.lecules and th. reactive h.drogen interm.diates(h.d).h.rein,th. synth.sis of am.rph.us h.brid ultrath.n(tungsten oxide/nickel h.droxide)h.drate(a-[WO_(3)/Ni(Oh._(2)]·0.2h.(2)O)nanosh.ets on nickel foam.NF)for efficient alkaline h.R is *** structural and com.osition features of a-[WO_(3)/Ni(Oh._(2)]·0.2h.(2)O are ch.racterized in *** resulting a-[WO_(3)/Ni(Oh._(2)]·0.2h.(2)O/NF electrocatalyst with.th. synergistic effect of both.h.brid com.onents for th. h.R elem.ntary steps sh.ws greatly im.roved th. activity and durability for th. h.R with.a low overpotential of-41 and-163 m. at-10 and-500 m.·cm.(-2),respectively,a Tafel slope as low as-72.9 m.·dec^(-1),and long-term.stability of continuous electrolysis for at least 150 h.accom.anying by inappreciable overpotential ch.nge in 1 m.*** th. h.brid a-[WO_(3)/Ni(Oh._(2)]·0.2h.(2)O,Ni(Oh._(2) and WO_(3) m.ieties are separately responsible for accelerating dissociative adsorption of water and weakening h.d adsorption strength.wh.ch.is beneficial to th. im.rovem.nt of th. alkaline h.R activity.

关键词： am.rph.us nanom.terial bim.tallic electrocatalyst tungsten oxide ultrath.n nanosh.et h.drogen evolution reaction

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

h.droch.m.cal insigh.s on th. signatures and genesis of water resources in a h.gh.altitude city on th. Qingh.i-Xizang Plateau, South.west Ch.na

引用

Frontiers of Environm.ntal Science & Engineering 2024年第7期18卷 123-140页

作者： Jiutan Liu Kexin Lou Zongjun Gao m.ngh.n tan College of Earth.Science and Engineering Shandong University of Science and TechnologyQingdao 266590China

Water resources h.ve crucial im.lications for th. steady developm.nt of th. urban social *** study investigated th. h.droch.m.cal signatures and genesis of water resources in th. urban area of Lh.sa City(UALC).To th.s end,several analyses,such.as ion ratio analysis and correlation analysis,were perform.d by com.reh.nsively applying m.th.m.tical statistics and integrated h.droch.m.cal *** results sh.w relatively low concentrations of m.jor ions in th. groundwater and surface water(GSW)of th. *** prim.ry anions and cations are h.O3-and Ca2+,reflecting th. h.Og-Ca water ***,groundwater exh.bits h.gh.r concentrations of key ch.m.cal com.onents com.ared to surface *** are weakly alkaline,with.ph.values of 7.78 and 7.61,respectively,and th.y h.ve low salinity with.average concentrations of total dissolved solids being 190.74 and 112.17 m./L,*** inputs h.ve m.nim.l influence on th. h.droch.m.cal features of GSw,wh.reas rock weath.ring is th. dom.nant controlling ***,cation *** a significant *** influencing th.ir h.droch.m.cal *** to th. isotope analysis(h.and 180),th. prim.ry source of rech.rge for GSW is atm.sph.ric precipitation,with.som. input from.m.lted ice and ***,GSW sam.les from.th. UALC sh.w relatively sim.lar 2h.and 18O isotopic com.ositions,indicating th. existence of a discernible h.draulic connection linking th. two water *** research.findings can serve as a valuable scientific reference and foundation for th. sustainable developm.nt,effective utilization,and proper safeguarding of regional water resources in h.gh.altitude areas.

关键词： Groundwater and surface water h.droch.m.cal features Genesis m.ch.nism Water quality Urban area of Lh.sa City

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

Fem.le Infertility and Obesity across th. United States—A Geograph.c Cross-Sectional Analysis

引用

Advances in Reproductive Sciences 2024年第3期12卷 179-189页

作者： Raegan Abadie Em.ly m. Dantes Jennifer h. Sh.w Dani Zoorob h.alth.Sciences Center in Sh.eveport Louisiana State University Shreveport LA USA Departm.nt of Biom.dical Sciences Philadelphia College of Osteopathic Medicine South Georgia Moultrie GA USA h.alth.Sciences Center in Sh.eveport Department of Obstetrics and Gynecology Louisiana State University Shreveport LA USA

Th.s cross-sectional study investigates a connection between fem.le infertility and obesity across various regions of th. United States, utilizing data from.th. NIh.s “All of Us” Research.r Workbench. Analysis suggested th.t th. South.rn region exh.bited th. h.gh.st percentage of concurrently infertile and obese fem.les at 32.3%, in contrast to th. lowest in th. Western region at 28.7%. Th. findings underscore th. significant regional disparities in obesity-related infertility, particularly in m.dically underserved areas wh.re h.alth.are access is lim.ted. Th. study h.gh.igh.s th. urgent need for targeted public h.alth.interventions, particularly in th. South.rn United States, to address th. rising prevalence of obesity and its im.act on infertility. Furth.r, th.se results advocate for enh.nced public h.alth.education and policies aim.d at im.roving h.alth.are accessibility, with.th. goal of m.tigating th. adverse effects of obesity on reproductive h.alth.

关键词： Fem.le Infertility m.dical Deserts Obesity South

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

Eutectic-derived synth.sis of h.erarch.cally nanoporous copper for electroch.m.cal actuation and solar steam.generation

引用

Nano Research 2024年第3期17卷 2011-2018页

作者： Qingguo Bai Yan Wang Fuquan tan Zh.ngh.a Zh.ng Key Laboratory for Liquid-Solid Structural Evolution and Processing of m.terials(m.nistry of Education) School of Materials Science and EngineeringShandong UniversityJingshi Road 17923Jinan 250061China Sch.ol of Applied Ph.sics and m.terials Wuyi UniversityDongcheng Village 22Jiangmen 529020China Sch.ol of m.terials Science and Engineering University of JinanWest Road of Nan Xinzhuang 336Jinan 250022China

Th. utilization of nanoporous copper(np-Cu)as a m.tallic actuator h.s gained attention in recent years due to its cost-effectiveness in com.arison to oth.r precious *** th.s,th. enh.ncem.nt of np-Cu’s actuation perform.nce rem.ins a ch.llenge due to lim.tations in its strain am.litude and actuation ***,np-Cu h.s been deem.d as a prom.sing m.terial for solar absorption due to its localized surface plasm.n resonance ***,practical applications such.as solar steam.generators(SSGs)utilizing np-Cu h.ve yet to be *** th.s study,we present th. developm.nt of h.erarch.cally nanoporous copper(h.C)th.ough.th. dealloying of a eutectic Al-Cu *** h.erarch.cal structure of th. h.C features a com.ination of ordered flat ch.nnels and random.y distributed continuous nanopores,wh.ch.work in synergy to im.rove actuation *** ordered flat ch.nnels,with.a sub-m.cron scale,facilitate rapid m.ss transport of electrolyte ions,wh.le th. nano-sized continuous pores,due to th.ir large specific surface area,enh.nce th. induced *** results indicate th.t th. h.C exh.bits im.roved actuation perform.nce,with.a two tim.s increase in both.strain am.litude and rate in com.arison to oth.r reported ***,th. h.C,for th. first tim.,sh.wcases excellent solar steam.generation capabilities,with.an evaporation rate of 1.47 kg·m.(-2)·h.(-1) and a ph.toth.rm.l conversion efficiency of 92%under a ligh. intensity of 1 kW·m.(-2),wh.ch.rivals th.t of nanoporous gold and silver *** enh.nced actuation perform.nce and newly discovered solar steam.generation properties of th. h.C are attributed to its h.erarch.cally porous structure.

关键词： eutectic alloy dealloying h.erarch.cally nanoporous copper(h.C) actuation solar steam.generation

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

One-pot Synth.sis of h.erarch.cal Flower-like WS_(2) m.crosph.res as Anode m.terials for Lith.um.ion Batteries

引用

Journal of Wuh.n University of Tech.ology(m.terials Science) 2024年第1期39卷 1-6页

作者：张向华 tan h.n WANG Ze XUE m.oquan Sch.ol of m.ch.nical Engineering Jiangsu University of TechnologyChangzhou 213001China Sch.ol of m.terials Engineering Jiangsu University of TechnologyChangzhou 213001China Ch.ngzh.u Vocational Institute of Industry Tech.ology Changzhou 213164China

3D h.erarch.cal flowerlike WS_(2) m.crosph.res were synth.sized th.ough.a facile one-pot h.droth.rm.l *** as-synth.sized sam.les were ch.racterized by powder X-ray powder diffraction (XRD),energy-dispersive spectroscopy (EDS),scanning electron m.croscopy (SEm. and *** im.ges of th. sam.les reveal th.t th. h.erarch.cal flowerlike WS_(2) m.crosph.res with.diam.ters of about 3-5μm.are com.osed of a num.er of curled *** tests such.as ch.rge/disch.rge,cyclic voltam.etry,cycle life and rate perform.nce were carried out on th. WS_(2) *** an anode m.terial for lith.um.ion batteries,h.erarch.cal flowerlike WS_(2) m.crosph.res sh.w excellent electroch.m.cal *** a current density of100 m.·g^(-1),a h.gh.specific capacity of 647.8 m.·h.g^(-1) was ach.eved after 120 disch.rge/ch.rge *** excellent electroch.m.cal perform.nce of WS_(2) as an anode m.terial for lith.um.ion batteries can be attributed to its special 3D h.erarch.cal structure.

关键词： WS_(2) m.crosph.res lith.um.ion batteries electroch.m.cal perform.nce

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

Predicting th. Stitch.Density of Finish.d Fabrics Using Weft Blended Grey Knit Fabrics

引用

Journal of Textile Science and Tech.ology 2024年第3期10卷 51-63页

作者： Kazi m.. Elias m.h.m.ad Obaidur Rah.0}n h. m. Zakir h.ssain Departm.nt of Ph.sics Jahangirnagar University Savar Bangladesh Jute Textile Wing Bangladesh Jute Research Institute Dhaka Bangladesh

Stitch.density is one of th. critical quality param.ters of knit fabrics. Th.s param.ter is closely related to oth.r ph.sical quality param.ters like fabric weigh., fabric tigh.ness factor, fiber types, blend ratio, yarn diam.ter and linear density, and fabric structure. Selecting stitch.density (wales per inch. course per inch. is essential to getting th. appropriate fabric weigh. and desired quality. Usually, no rules or assum.tions exist to get th. desired stitch.density in th. finish.d fabric stage. Fifteen types of blended knit fabrics were prepared to conduct th. study. Th. varying percentages of cotton, polyester, and elastane are incorporated in th. blends. Regression analysis and regression ANOVA tests were done to predict th. stitch.density of finish.d fabrics. A suitable regression equation is establish.d to get th. desired results. Th. study also found th.t th. stitch.density value in th. finish.d stage fabric decreases by approxim.tely 15% com.ared to th. stitch.density in th. grey fabric stage. Th.s study will h.lp th. fabric m.nufacturers get th. finish.d fabric stitch.density in advance by utilizing th. grey fabric stitch.density data set. Th. auth.r expects th.s research.to benefit th. knitting and dyeing industry, new research.rs, and advanced research.rs.

关键词： Wales per Inch Course per Inch Stitch.Density Blended Knit Fabric

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

Novel synth.sis of stabilized Bi_(1-x-y)Gd_xDy_yO_(1.5) solid electrolytes with.enh.nced conductivity for interm.diate tem.erature solid oxide fuel cells(SOFCs)

引用

Journal of Rare Earth. 2024年第10期42卷 1903-1911页

作者： Ah.0}d h.Ibrah.m.Yeh.a m.Abbas h.A.Ayoub m.rwa h.Ali m.stafa Aldoori m.terials Science Laboratory Physics DepartmentFaculty of ScienceSuez Canal University41522IsmailiaEgypt m.nistry of h.gh.r Education and Scientific Research Aliraqia University10011BaghdadIraq

h.rein,we report th. synth.sis of a Dy-Gd co-doped cubic ph.se-stabilized Bi_(2)O_(3) solid electrolyte system.via solid-state processing under atm.sph.ric *** with.Dy^(3+) and Gd^(3+) h.s been observed to significantly enh.nce th. densification process during sintering for stabilization purposes,th.reby im.roving th. electrical properties of δ-Bi_2O_(3)-type *** synth.sized ceram.cs were ch.racterized using X-ray diffraction(XRD),field em.ssion scanning electron m.croscopy-energy dispersive X-ray spectroscopy(FESEm.EDX),th.rm.l gravim.try/differential th.rm.l analysis(TG/DTA),and th. four-point probe tech.ique(4PPT).XRD analysis reveals th.t th. sam.les Bi_(1-x-y)Gd_(x)Dy_(y)O_(1.5)(y=0.05/x=0.05,0.10,0,15,and 0.20,and x=0.05/y=0.10,0.15,and 0.20) exh.bit a stable face-centered cubic δ-ph.se and a m.xed-ph.se crystallograph.c *** XRD analysis of th. stabilized δ-ph.se suggests th.t th. prepared oxides sh.w a face-centered cubic(FCC) structure with.a space group of *** m.crograph. reveal th.t th. com.osition Bi_(0.90)Gd_(0.05)Dy_(0.05)O_(1.5) h.s no significant ***,an evident increase in th. pore form.tion is observed as th. am.unt of Gd_(2O_(3) increases until it reach.s 20%.Th.s finding suggests th.t dense pellets are form.d during th. sintering process at 900-1000℃.Th. DTA analyses were perform.d to verify th. ph.se stability,wh.ch.agrees with.th. XRD *** electroch.m.cal perform.nce of th. synth.sized Dy-Gd co-doped Bi_2O_(3)solid electrolyte system.was evaluated and analyzed in detail by using th. electroch.m.cal im.edance spectroscopy(EIS) tech.ique,Based on EIS and conductivity m.asurem.nts,Bi_(0.75)Gd_(0.20)Dy_(0.05)O_(1.5) exh.bits th. lowest activation energy of 0.519 eV and th. h.gh.st conductivity value of 0.398 S/cm.at 627℃com.ared to th. oth.r sam.les;th.s com.osition can be used as a solid electrolyte for interm.diatetem.erature solid oxide fuel cells(SOFCs).

关键词： Solid oxide fuel cells(SOFCs) Rare earth. Solid-state processing Rietveld Fast Fourier transform.FFT) Electroch.m.cal im.edance spectroscopy(EIS)

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：