检索结果-南通市图书馆

Applied Mathematics and Mechanics(English Edition) 2025年第1期46卷 81-100页

作者： s.sAUr.BH r.KIr.N D.sINGH r.VAIsH V.s.CHAUHAN school of Mechanical and Mater.als Engineer.ng Indian Institute of Technology Mandi

Bio-inspir.d helicoidal composite laminates, inspir.d by the intr.cate helical str.ctur.s found in natur., pr.sent a pr.mising fr.ntier.for.enhancing the mechanical pr.per.ies of str.ctur.l designs. Hence, this study pr.vides a compr.hensive investigation into the nonlinear.fr.e vibr.tion and nonlinear.bending behavior.of bio-inspir.d composite plates. The inver.e hyper.olic shear.defor.ation theor.(IHsDT) of plates is employed to char.cter.ze the displacement field, with the incor.or.tion of Gr.en-Lagr.nge nonlinear.ty. The pr.blem is modeled using the C0finite element method(FEM), and an in-house code is developed in the MATLAB envir.nment to solve it numer.cally. Var.ous helicoidal layup configur.tions including helicoidal r.cur.ive(Hr., helicoidal exponential(HE), helicoidal semi-cir.ular.Hs), linear.helicoidal(LH), and Fibonacci helicoidal(FH)with differ.nt layup sequences and quasi-isotr.pic configur.tions ar. studied. The model is validated, and par.metr.c studies ar. conducted. These studies investigate the effects of layup configur.tions, side-to-thickness r.tio, modulus r.tios, boundar. conditions, and loading conditions at differ.nt load amplitudes on the nonlinear.vibr.tion and nonlinear.bending behavior. of bio-inspir.d composite plates. The r.sults show that the laminate sequence exer.s a substantial impact on both nonlinear.natur.l fr.quencies and nonlinear.bending behavior.. Mor.over. this influence var.es acr.ss differ.nt side-to-thickness r.tios and boundar. conditions of the bio-inspir.d composite plate.

关键词：

Like mother. like daughter. her.tability of female r.char.son＇s gr.und squir.el Ur.citellus r.char.sonii cor.isol str.ss r.sponses

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Cur.ent Zoology 2018年第2期64卷 153-163页

作者： kevin r. bair.s-novak Calen r.r.AN Angela r. Fr.EMAN W. Gar. ANDEr.ON James F, HAr. Depar.ment of Biological sciences University of Manitoba Winnipeg Manitoba R3T 2N2 Canada Depar.mentof Biology University of Saskatchewan Saskatoon S7N 5E2 Saskatchewan Canada Depar.ment ofAnthr.pology Northwestern University Evanston 60208 Illinois USA Depar.ment of Biological sciences Kent State University Kent 44242 Ohio USA

Activation of the hypothalamic-pituitar.-adr.nal （HPA） axis liber.tes glucocor.icoids, which pr.vides an acute indication of an individual＇s r.sponse to str.ssor.. The her.tability of the str.ss r.sponse in wild mammals, however. r.mains poor.y documented. We quantified the cor.isol str.ss r.sponse of female r.char.son＇s gr.und squir.els （r.ss） to handling and physical r.str.int, testing for. （1） the effects of individual age, time of day, and sample latency; （2） r.peatability within individuals; （3） nar.ow-sense her.tability; and （4） differ.nces among individuals owing to potential genetic and/or.envir.nmental effects. We detected a positive linear.r.lationship between baseline plasma cor.isol （BL-cor.isol） concentr.tion and str.ss-induced plasma cor.isol （sl-cor.isol） concentr.tion that defined each individual＇s cor.isol str.ss r.sponse. BL-cor.isol, sI-cor.isol, and str.ss r.sponse did not differ.accor.ing to the time the sample was taken, or.by subject age. Cor.isol str.ss r.sponse was highly r.peatable within individuals, had a mother.offspr.ng her.tability of h2 =0.40 ± 0.24 （mean ±sE）, full-sibling her.tability of h2s = 0.37 ± 0.71, and half-sibling her.tabil- ity of hHs^2 = 0.75 ± 1.41. str.ss r.sponses of sibling gr.ups, immediate-family gr.ups, and squir. r.ls within a given ar.a did not differ. wher.as those of individuals fr.m mor. distantly r.lated matr.lines did. Our.r.sults highlight the natur.l var.ability in HPA axis r.activity among individuals by quantifying both BL- and sI-cor.isol levels, demonstr.te par.ial her.tability of the str.ss r.sponse that is not attr.butable to envir.nmental var.ation, and suggest that at least par. of an indi- vidual＇s str.ss r.sponse can be accounted for.by differ.nces in matr.lineal histor..

关键词： glucocor.icoids gr.und squir.el her.tability hypothalamic-pituitar.-adr.nal axis r.activity str.ss r.sponse.

The viscosity at the glass tr.nsition of a liquid lubr.cant

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Fr.ction 2019年第1期7卷 86-91页

作者： scott bair Center.for.High-Pr.ssur. r.eology George W.Woodruff School of Mechanical Engineering Georgia Institute of Technology

In the classical study of elastohydr.dynamic lubr.cation(EHL) which does not employ r.al, measur.ble viscosity in analysis, the possibility of a glass tr.nsition has not been consider.d in many year.. Indeed, the two r.eological assumptions of classical EHL, the Newtonian inlet and the equivalence of a tr.ction cur.e to a flow cur.e, would not have per.isted so long had the pr.ssur. dependence of the viscosity been accur.tely stated. With the r.cent appear.nce of viscosity obtained fr.m viscometer. in EHL analysis, the possibility of a glass tr.nsition in the contact should be r.examined, especially for.the fr.gile tr.ction fluids. This ar.icle employs published data for.a synthetic cycloaliphatic hydr.car.on to estimate the glass tr.nsition viscosity so that, when using r.al viscosities in EHL simulations, the state of the liquid may be assessed. Far.into the glassy state the liquid should be tr.ated as an elastic solid with a yield str.ss.

关键词： elastohydr.dynamic lubr.cation glass tr.nsition high pr.ssur. viscosity EHL fr.ction

Fr.e vibr.tion and tr.nsient r.sponse of double cur.ed beams connected by inter.ediate str.ight beams

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2025年第1期46卷 37-62页

作者： r.A.JAFAr.-TALOOKOLAEI H.GHANDVAr.E.JUMAEV s.KHATIr.T.CUONG-LE school of Mechanical Engineer.ng Babol Noshirvani University of Technology Depar.ment of Mechanical Engineer.ng Faculty of Engineering New Uzbekistan University Univer.ity of Business and science Center.for.Engineer.ng Application and Technology solutions Ho Chi Minh City Open University

This paper.investigates the fr.e vibr.tion and tr.nsient r.sponse of inter.onnected str.ctur.s including double cur.ed beams and inter.ediate str.ight beams,which ar. all constr.cted fr.m functionally gr.ded por.us(FGP) mater.als. The str.in potential and kinetic ener.ies of each beam along with the wor. done by the exter.al for.e ar. calculated. Additionally, a higher.or.er.beam element is intr.duced to der.ve stiffness and mass matr.ces, along with the for.e vector. The cur.ed and str.ight beams ar. discr.tized, and their.assembled stiffness, mass matr.ces, and for.e vector., ar. *** conditions at the joints ar. used to der.ve the total matr.ces of the entir. str.ctur.. subsequently, the natur.l fr.quencies and tr.nsient r.sponse of the system ar. deter.ined. The accur.cy of the mathematical model and the self-developed computer.pr.gr.m is validated thr.ugh the compar.son of the obtained r.sults with those of the existing liter.tur. and commer.ial softwar. ANsYs, demonstr.ting excellent ***, a compr.hensive study is conducted to investigate the effects of var.ous par.meter. on the fr.e vibr.tion and tr.nsient r.sponse of the consider.d str.ctur..

关键词：

sur.ical site soft tissue thickness as a pr.dictor.of complications following ar.hr.plasty

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Wor.d Jour.al of Methodology 2025年第2期15卷 62-73页

作者： kevin A Wu Faheem Pottayil Cr.stal Jing Ankit Choudhur. Alber. T Anastasio Depar.ment of Or.hopaedic sur.er. Duke University HospitalDurhamNC 27710United States Depar.ment of Or.hopaedic sur.er. Medical College of Georgia at Augusta UniversityAugustaGA 30912United States Depar.ment of Or.hopaedic sur.er. Medical College of WisconsinMilwaukeeWI 53226United States

Appr.ciation of soft-tissue thickness(sTT)at sur.ical sites is an incr.asingly r.cognized aspect of ar.hr.plasty pr.cedur.s as it may potentially impacting postoper.tive *** r.sear.h has focused on the pr.dictive value of pr.oper.tive sTT measur.ments for.complications following var.ous for.s of ar.hr.plasty,par.icular.y infections,acr.ss pr.cedur.s such as total knee,hip,shoulder.and ankle *** studies have indicated that incr.ased sTT is associated with a higher.r.sk of complications,including infection and wound healing *** assessment of sTT befor. sur.er. could play a cr.cial r.le in identifying patients at a higher.r.sk of complications and may be instr.-mental in guiding pr.oper.tive planning to optimize outcomes in ar.hr.plasty *** measur.ment techniques and fur.her.r.sear.h ar. essential to enhance the r.liability and clinical utility of sTT assessment for.ar.hr.-plasty sur.er..

关键词： soft-tissue thickness Ar.hr.plasty sur.ical complications Total knee ar.hr.plasty Total hip ar.hr.plasty Total shoulder.ar.hr.plasty Total ankle ar.hr.plasty Pr.oper.tive assessment Wound healing Infection r.sk

The eco-or.gins, actions and demonstr.tion r.les of Beijing Gr.en Olympic Game

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Jour.al of Envir.nmental sciences 2001年第4期13卷 514-519页

作者： Wang, r.-s. r.s. Cntr. Eco-Envir.nmental sci. Chinese Academy of Sciences Beijing 100085 China

The 29th Olympic Game will be held in Beijing in 2008. It will be a gr.en game to pr.mote sustainable development of men, cities and r.gions thr.ugh ecological development advocating 'man and natur. be in one'. 'Eco' her. means a pr.cess, a dr.ving for.e, an action, a cultur. and a kind of vitality leading to sustainable development. It is a mechanism embodying the Olympic spir.t of competition, cooper.tion and self-r.liance. The paper.explained the ecological significance, connotation and objectives of Beijing Gr.en Olympic Game. Ten major.ecological her.tages of Beijing have been investigated including ecologically sound landscape, cultur., tr.nspor.ation, physical exer.ise, health car., sanitation, food, family r.lationship, agr.cultur., and human ecological totality. To pr.ser.e or.r.stor. the above mentioned old tr.dition, a gr.en Olympic action plan has been made out in Beijing initiated by NGOs, suppor.ed by entr.pr.neur. and coor.inated by gover.ment agencies. Four.kinds of eco-engineer.ng have been planned for.blue sky, clean water. gr.en land and eco-city development. The demonstr.tion r.le of Beijing Gr.en Olympic Game to developing r.gions and countr.es is also discussed.

关键词： Agr.cultur. Health car. sanitation sustainable development Tr.nspor.ation

seismic behavior.of var.able fr.quency pendulum isolator

在线全文

学校读者我要写书评

暂无评论

Ear.hquake Engineer.ng and Engineer.ng Vibr.tion 2008年第2期7卷 193-205页

作者： V. r. Panchal r. s. Jangid Depar.ment of Civil Engineer.ng Indian Institute of TechnologyBombayPowaiMumbai 400076India

Ear.hquake per.or.ance of a flexible one-stor. building isolated with a var.able fr.quency pendulum isolator.（VFPI） under.near.fault and far.field gr.und motions is investigated. The fr.ctional for.es mobilized at the inter.ace of the VFPI ar. assumed to be velocity dependent. The inter.ction between fr.ctional for.es of the VFPI in two hor.zontal dir.ctions is duly consider.d and coupled differ.ntial equations of motion of the isolated system in the incr.mental for. ar. solved iter.tively. The r.sponse of the system with bi-dir.ctional inter.ction is compar.d with those without inter.ction. In addition, the effects of velocity dependence on the r.sponse of the isolated system ar. also investigated. Mor.over. a par.metr.c study is car.ied out to cr.tically examine the influence of impor.ant par.meter. on bi-dir.ctional inter.ction effects of the fr.ctional for.es of the VFPI. These par.meter. ar.： the super.tr.ctur. time per.od, fr.quency var.ation factor.（FVF） and fr.ction coefficient of the VFPI. Fr.m the above investigations, it is obser.ed that the dependence of the fr.ction coefficient on r.lative velocity of the system does not have a noticeable effect on the peak r.sponse of the system isolated with VFPI, and that the bi-dir.ctional inter.ction of fr.ctional for.es of the VFPI is impor.ant and if neglected, isolator.displacements will be under.stimated and the super.tr.ctur. acceler.tion and base shear.will be over.stimated.

关键词： base isolation bi-dir.ctional inter.ction super.tr.ctur. flexibility near.fault gr.und motion fr.ction coefficient far.field gr.und motion VFPI

Getting physical with medical education:Exer.ise based vir.ual anatomy r.view classes for.medical students

在线全文

学校读者我要写书评

暂无评论

Wor.d Jour.al of Methodology 2025年第1期15卷 20-25页

作者： Nadeesha r.samar.singhe Taniya s Nagpal Michele L Bar.eau Char.s M Mar.in Division of Gener.l sur.er. Faculty of MedicineUniversity of British ColumbiaVancouver V6T 1Z3BCCanada Faculty of Kinesiology Sport and RecreationUniversity of AlbertaEdmonton T6G 2R3ABCanada Anatomy and Cell Biology University of Western OntarioLondon N6A 3K7ONCanada Depar.ment of Anatomy and Cell Biology Schulich School of Medicine and DentistryThe University of Western OntarioLondon N6A 3K7ONCanada

The benefits of r.gular.physical activity ar. well ***,few studies have examined the effectiveness of integr.ting physical activity(PA)into cur.icula within a post-secondar. *** investigate the incor.or.tion of PA into medical cur.iculum,we developed a ser.es of optional exer.ise-based r.view sessions designed to r.infor.e musculoskeletal(MsK)anatomy cour.e *** synchr.nous sessions wer. co-taught by a gr.up fitness instr.ctor.and an anatomy *** fitness instr.ctor.would lead students thr.ugh both str.ngth and yoga style exer.ises,while the anatomy instr.ctor.asked questions about r.levant anatomical str.ctur.s r.lated to cour.e mater.al pr.viously *** the sessions,par.icipants wer. asked to evaluate the classes on their.self-r.por.ed exam pr.par.dness in impr.ving MsK anatomy knowledge,PA levels,and mental *** par.icipants completed sur.eys;a major.ty agr.ed that the classes incr.ased under.tanding of MsK concepts(90.0%)and activity levels(97.7%).Many(70.0%)felt that the classes helped r.duce *** major.ty of r.spondents(90.0%)agr.ed that the classes contr.buted to incr.ased feelings of social ***,medical students saw benefit in PA based inter.entions to supplement MsK cour.e *** with incr.asing activity levels and pr.moting health behaviour.,integr.ting PA into medical cur.iculum may impr.ve compr.hension of lear.ing mater.al,alleviate str.ss and foster.social connectivity among medical students.

关键词： Medical education Musculoskeletal Anatomy Exer.ise Online lear.ing

Gr.wth and char.cter.zation of single cr.stals of the quater.ar. TlGases compound

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2013年第5期22卷 564-567页

作者： s. r. Alhar.i Physics Depar.ment Faculty of SciencesKing Abdulaziz University

The electr.cal conductivity and Hall effect for.T1Gases cr.stals have been investigated over.a wide temper.tur. r.nge. The cr.stals we used ar. gr.wn by a modified Br.dgman technique and possess p-type conductivity. The ener.y gap has been found to be 1.63 eV, wher.as the ionization ener.y is 0.25 eV. The var.ations of the Hall mobility as well as the car.ier.concentr.tion with temper.tur. have been investigated. The scatter.ng mechanisms of the car.er.ar. checked over.the whole investigated temper.tur. r.nge. Fur.her.or., the diffusion coefficient, r.laxation time, and diffusion length of holes ar. estimated.

关键词： cr.stal gr.wth DC electr.cal conductivity Hall effect T1Gases compound

r.sponse of a slender.cylindr.cal member.under.br.aking wave impact

在线全文

学校读者我要写书评

暂无评论

Jour.al of Hydr.dynamics 2019年第2期31卷 345-357页

作者： Manjula r. sannasir.j s.A Depar.ment of Civil Engineer.ng National Institute of TechnologyTiruchirappalliIndia Depar.ment of Ocean Engineer.ng Indian Institute of Technology MadrasChennaiIndia

A slender.cylindr.cal member.is the fundamental component of many coastal and offshor. *** is essential to under.tand the action of br.aking waves on str.ctur.l member. since,when these member. ar. subjected to wave impact load,the str.ctur.l damages and failur.s may be *** the pr.sent study,an exper.mental investigation has been car.ied out to measur. the r.sponse of the slender.ver.ical cylinder.subjected to br.aking wave *** measur.ments wer. made in or.er.to estimate the total for.e acting on the *** empir.cal r.lation is established between total impact for.e and the wave steepness par.meter.which dictates the intensity of the *** r.se time is an impor.ant par.meter.dictating the impact *** acceler.tion and str.in measur.ments wer. made to evaluate the r.sponse of the *** has been der.ved fr.m str.ctur. *** deflection due to the moder.te plunging differ. by two or.er.mor. than sever. plunging *** r.te is another.impor.ant consider.tion for.the impact *** higher.str.in r.te incr.ases the r.sistance of the *** the br.aking wave impact on the cylinder.the str.in r.te var.es fr.m 102 to 10-4.

关键词： Br.aking wave impact acceler.tion slender ver.ical cylinder wave steepness str.in r.te str.in