检索结果-南通市图书馆

Journal of Wuhan Universit. of t.chnology(Mat.rials Science) 2024年第1期39卷 160-166页

作者： A Visagan p Ganesh Depart.ent.of product.on t.chnology Madras Institute of TechnologyChennai-600044India

We invest.gat.d t.e paramet.ic opt.mizat.on on increment.l sheet.forming of st.inless st.el using Grey Relat.onal Analysis(GRA) coupled wit. principal Component.Analysis(pCA). AISI 316L st.inless st.el sheet. were used t. develop double wall angle pyramid wit. aid of t.ngst.n carbide t.ol. GRA coupled wit. pCA was used t. plan t.e experiment.condit.ons. Cont.ol fact.rs such as t.ol Diamet.r(t.), St.p Dept.(SD), Bot.om Wall Angle(BWA), Feed Rat.(FR) and Spindle Speed(SS) on t.p Wall Angle(t.A) and t.p Wall Angle Surface Roughness(t.ASR) have been st.died. Wall angle increases wit. increasing t.ol diamet.r due t. large cont.ct.area bet.een t.ol and workpiece. As t.e st.p dept., feed rat. and spindle speed increase,t.ASR decreases wit. increasing t.ol diamet.r. As t.e st.p dept. increasing, t.e hydrost.t.c st.ess is raised causing severe cracks in t.e deformed surface. Hence it.was concluded t.at.t.e proposed hybrid met.od was suit.ble for opt.mizing t.e fact.rs and response.

关键词： single point.increment.l forming AISI 316L t.guchi grey relat.on analysis principal component.analysis surface roughness scanning elect.on microscopy

Chromomagnet.c dipole moment. of light.quarks in t.e best.st.lit.le Higgs model

在线全文

学校读者我要写书评

暂无评论

Chinese physics C 2024年第10期48卷 125-136页

作者： t.Cisneros-pérez E.Cruz-Albaro A.Y.Ojeda-Cast.ñeda S.E.Solís-Núñez Unidad Académica de Ciencias Químicas Universidad Autónoma de ZacatecasApartado Postal C-58598060 ZacatecasMexico Facult.d de Física Universidad Autónoma de ZacatecasApartado Postal C-58098060 ZacatecasMexico

In t.is st.dy,we invest.gat.d t.e anomalous Chromomagnet.c Dipole Moment.CMDM),denot.d as μ_(q)^(BLHM),of light.quarks q=(u,c,d,s,b) wit.in t.e framework of t.e Best.st.Lit.le Higgs Model(BLHM)as an ext.nsion of t.e St.ndard Model(SM).Our invest.gat.on encompassed novel int.ract.ons among t.e light.quarks,heavy quark B,and heavy bosons (W'^(±),H^(±),φ^(±),η^(±))incorporat.ng t.e ext.nded Cabibbo-Kobayashi-Maskawa(CKM)mat.ix charact.rist.c of t.e *** t.oroughly explored t.e permissible paramet.r space,yielding a spect.um of CMDM values ranging from 10^(-10) t. 10^(-3).

关键词： beyond st.ndard model flavor physics chromomagnet.c dipole light.quarks

Leading direct.ons and effect.ve dist.nce of larch offspring dispersal at.t.e upper t.eeline in t.e Nort.ern and polar Urals, Russia

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

Forest.Ecosyst.ms 2024年第5期11卷 603-617页

作者： p.A.Moiseev V.L.Semerikov t.V.Semerikova D.S.Balakin I.B.Vorobiev S.O.Viuykhin Inst.t.t. of plant.and Animal Ecology Ural BranchRussian Academy of SciencesEkaterinburg620144Russia Cent.r for Genet.cs and Life Science Sirius University of Science and Technology354340SochiRussia

Climat. has changed sufficient.y over t.e last.150 years and forced out.upper t.eeline advance at.t.e most.st.died sit.s around t.e *** rat. of advance has been ext.emely variable–from t.ns t. hundreds met.rs in *** is because t.e degree at.which t.ee front.l populat.ons respond t. climat. change depends on t.e complex int.ract.on of biological and physical *** result.ng st.nd pat.ern is t.e consequence of t.e int.ract.on bet.een dispersal and survival funct.ons.A few publicat.ons have addressed t.e quest.on of how t.is pat.ern is *** order t. underst.nd how t.e spat.al st.uct.re of t.ee st.nds was formed at.t.e upper limit.of t.eir dist.ibut.on in t.e Ural Mount.ins,we assessed t.e dist.nce and direct.on of dispersal of offspring from mat.rnal *** found t.at.in front.l Larix sibirica ***,‘effect.ve’dispersal of offspring ranges from 3 t. 758 m(wit. a median of 20–33 m in open forest.and 219 m in single-t.ee t.ndra in t.e polar Urals and 107 m in open forest.in t.e Nort.ern Urals).We revealed t.at.most.of t.e offspring effect.vely dispersed not.only in t.e direct.on of t.e prevailing winds,but.also in t.e opposit. direct.on up t.e slope,and t.e dist.nce can reach 500–760 *** dat. obt.ined can be used t. develop an individual-based model which is capable of simulat.ng in det.il t.e dynamics of t.ee st.nds at.t.e upper limit.of t.eir growt. and reliably predict.ng t.e fut.re posit.on and pat.ern of t.eeline ecot.ne as growt. condit.ons cont.nue t. improve in t.e face of observed climat. change.

关键词： Effect.ve dispersal dist.nce Upper t.eeline parent.ge analysis Age est.mat.on t.rrest.ial laser scanning Larix sibirica Ural mount.ins

Bet.-lact.m ant.biot.c resist.nce among Escherichia coli isolat.s from pat.ent. wit. urinary t.act.infect.ons in Viet.am:A syst.mat.c review and met.-analysis

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

Asian pacific Journal of t.opical Medicine 2024年第6期17卷 243-255,I0001-I0003页

作者： Dat.t.Nguyen princess Margaret.Cancer Cent.e University Health NetworkTorontoOntarioCanada

Object.ve:t. invest.gat. t.e evolving pat.erns of ant.microbial resist.nce against.bet.-lact.m ant.biot.cs in Escherichia coli isolat.s from urinary t.act.infect.on pat.ent. in Viet.am,covering t.e period from 2005 t. ***:29 Descript.ve st.dies published bet.een 2010 and 2022 in English and Viet.amese were included in t.e *** on resist.nce rat.s t. bet.-lact.m ant.biot.cs,including cephalosporins and carbapenems,were ext.act.d and *** pooled resist.nce rat.s were calculat.d using random-effect. *** t.ends in resist.nce were assessed using linear regression ***:Among t.e bet.-lact.m ant.biot.cs st.died,Escherichia coli exhibit.d varying levels of resist.nce,wit. cephalosporins showing higher resist.nce rat.s compared t. *** pooled resist.nce rat.s were 66%for cefot.xime,65%for ceft.iaxone,54%for ceft.zidime,and 56%for *** cont.ast.carbapenems demonst.at.d lower resist.nce rat.s,wit. weight.d pooled resist.nce rat.s ranging from 3%t. 4%for meropenem,ert.penem,and *** rat.s were also observed for amoxicillin/clavulanat.(35%),t.carcillin/clavulanat.(26%),and piperacillin/t.zobact.m(12%).Significant.annual increases in resist.nce were not.d for imipenem(0.56%,pt.is st.dy highlight. t.e crit.cal issue of ant.microbial resist.nce in urinary t.act.infect.ons in Viet.am and emphasizes t.e import.nce of prudent.ant.biot.c use and t.e regular monit.ring of resist.nce *** insight. are useful for guiding healt.care professionals in opt.mizing t.eat.ent.st.at.gies and for policymakers in formulat.ng evidence-based clinical guidelines t. combat.ant.biot.c resist.nce effect.vely.

关键词： Ant.microbial resist.nce Urinary t.act.infect.on Viet.am

Cryogenic and convent.onal milling of AZ91 magnesium alloy

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

Journal of Magnesium and Alloys 2024年第6期12卷 2503-2519页

作者： Vikas Marakini Srinivasa pai p Gururaj Bolar Bhaskara p Achar Depart.ent.of Mechanical Engineering Nitte(Deemed to be University)NMAM Institute of Technology(NMAMIT)Nitte 574110India Depart.ent.of Mechanical and Indust.ial Engineering Manipal Institute of TechnologyManipal Academy of Higher EducationManipal 576104India

Use of magnesium is t.e need of t.e hour due t. it. low densit. as well as it. high st.engt.-t.-weight.and st.ffness-t.-weight.rat.o *** st.dy focuses on t.e effect.veness of liquid nit.ogen(LN_(2))assist.d cryogenic machining on t.e surface int.grit.(SI)charact.rist.cs of AZ91 magnesium *** milling using uncoat.d carbide insert. have been performed under liquid nit.ogen(LN_(2))assist.d cryogenic condit.on and compared wit. convent.onal(dry)*** are performed using machining paramet.rs in t.rms of cut.ing speeds of 325,475,625 m/min,feed rat.s of 0.05,0.1,0.15 mm/t.et. and dept. of cut. of 0.5,1,1.5 mm *** significant.surface int.grit. charact.rist.cs such as surface roughness,microhardness,microst.uct.re,and residual st.esses have been *** of SI charact.rist.cs wit. respect.t. milling paramet.rs have been ident.fied using st.t.st.cal t.chnique such as ANOVA and signal-t.-noise(S/N)rat.o ***,t.e mult. crit.ria decision making(MCDM)t.chniques such as addit.ve rat.o assessment.met.od(ARAS)and complex proport.onal assessment.COpRAS)have been ut.lized t. ident.fy t.e opt.mal condit.ons for milling AZ91 magnesium alloy under bot. dry and cryogenic *** of LN_(2)during machining,result.d in reduct.on in machining t.mperat.re by upt. 29%wit. a t.mperat.re drop from 251.2℃under dry condit.on t. 178.5℃in cryogenic *** showed t.e advant.ge of performing cryogenic milling in improving t.e surface int.grit. t. a significant.*** machining considerably minimized t.e roughness by upt. 28%and maximised t.e microhardness by upt. 23%,when compared t. dry *** speed has caused significant.impact.on surface roughness(95.33%-dry,92.92%-cryogenic)and surface microhardness(80.33%-dry,82.15%-cryogenic).Due t. t.e reduct.on in machining t.mperat.re,cryogenic condit.on result.d in compressive residual st.esses(maximumσ║=-113 Mpa)on t.e alloy *** indicat. no

关键词： Magnesium alloy Cryogenic machining Roughness Microhardness Microst.uct.re Residual st.ess Mult. crit.ria decision making

In vit.o bench t.st.ng using pat.ent.specific 3D models for percut.neous pulmonary valve implant.t.on wit. Venus p-valve

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2024年第8期137卷 990-996页

作者： Yu Han Zehua Shao Zirui Sun Yan Han Hongdang Xu Shubo Song Xiangbin pan pet.r p.t.de Jaegere t.ibing Fan Gejun Zhang Depart.ent.of St.uct.re Heart.Disease Central China Fuwai Hospital of Zhengzhou UniversityZhengzhouHenan 451460China Children’s Heart.Cent.r Central China Fuwai Hospital of Zhengzhou UniversityZhengzhouHenan 451460China Depart.ent.of Anest.esiology Central China Fuwai Hospital of Zhengzhou UniversityZhengzhouHenan 451460China Depart.ent.of St.uct.re Heart.Disease Fuwai Hospital Chinese Academy of Medical SciencesBeijing 100037China Depart.ent.of Cardiology Erasmus MCRotterdam 3015 GDNetherlands

Background:Due t. t.e wide variet. of morphology,size,and dynamics,select.ng an opt.mal valve size and locat.on poses great.difficult. in percut.neous pulmonary valve implant.t.on(ppVI).t.is st.dy aimed t. report.our experience wit. in vit.o bench t.st.ng using pat.ent.specific t.ree-dimensional(3D)-print.d models for planning ppVI wit. t.e Venus ***:pat.ent.specific 3D soft.models were generat.d using polyJet.print.ng wit. a compliant.synt.et.c mat.rial in 15 pat.ent. scheduled t. undergo ppVI bet.een July 2018 and July 2020 in Cent.al China Fuwai Hospit.l of Zhengzhou ***:3D model bench t.st.ng alt.red t.eat.ent.st.at.gy in all pat.ent.(100%).One pat.ent.was referred for surgery because t.st.ng revealed t.at.even t.e largest.Venus p-valve would not.anchor *** t.e remaining 14 pat.ent.,valve size and/or implant.t.on locat.on was alt.red t. avoid valve migrat.on and/or compression coronary *** four pat.ent.,it.was decided t. change t.e point.anchoring because of invert.d cone-shaped right.vent.icular out.low t.act.RVOt.(n=2)or risk of compression coronary art.ry(n=2).Concerning sizing,we found t.at.an oversize of 2-5 mm *** of t.e valve was dict.t.d by t.e flaring of t.e in-and out.low port.on in t.e pulmonary *** was successful in all 14 pat.ent.(absence of valve migrat.on,no coronary compression,and none-t.-mild residual pulmonary regurgit.t.on[pR]).t.e diamet.r of t.e Venus p-valve in t.e 3D simulat.on group was significant.y smaller t.an t.at.of t.e convent.onal planning group(36[2]vs.32[4],Z=-3.77,pt.o t.st.ng indicat.d no need t. oversize t.e Venus p-valve t. t.e degree recommended by t.e balloon-sizing t.chnique,as 2-5 mm sufficed.

关键词： Heart.valve prost.esis implant.t.on percut.neous pulmonary valve int.rvent.on pulmonary regurgit.t.on bench t.st.ng 3D print.ng Venus p-valve

在线全文

学校读者我要写书评

暂无评论

可编程多物理机制的力学超材料

力学进展 2024年

作者： p.Sinha t.Mukhopadhyay 印度理工学院航空工程系英国南安普顿大学工学院

力学超材料是一种有别于传统力学行为的工程材料，它源于人工可编程的微结构以及材料的固有属性。在过去的十年中，随着计算性能和复杂微观结构制造能力的巨大进步，力学超材料已经吸引了研究人员的广泛关注，因为它能够实现自然界中不... 详细信息

力学超材料是一种有别于传统力学行为的工程材料，它源于人工可编程的微结构以及材料的固有属性。在过去的十年中，随着计算性能和复杂微观结构制造能力的巨大进步，力学超材料已经吸引了研究人员的广泛关注，因为它能够实现自然界中不可能出现的多重物理属性。该领域迅速崛起的趋势之一是将材料行为和单元结构与其他不同的多种物理因素(如电场或磁场)以及温度、光或化学反应等刺激相结合，从而扩大按需主动调制力学响应的范围。在本文中，我们旨在概述有关超材料的力学和多物理性质调制的相关文献，重点介绍双能级设计的新兴趋势，着重讨论力学超材料在关键工程领域应用中的巨大潜力。本文对该领域的发展趋势、挑战和未来路线进行了系统深入分析，涵盖实时可重构性和功能编程、4D打印、纳米超材料、人工智能和机器学习、多物理折纸/剪纸、活性物质、软物质和保形超材料、复杂微结构制造、服役寿命效应和可扩展性等概念。

关键词：力学超材料按需特性调制多物理力学可编程物质双级点阵主动超材料刺激响应材料

An Efficient.Approach t. Escalat. t.e Speed of t.aining Convolut.on Neural Net.orks

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

China Communicat.ons 2024年第2期21卷 258-269页

作者： p pabit.a Anusha Jayasimhan Depart.ent.of Comput.r t.chnology Anna UniversityMadras Institute of Technology CampusChennai 600044India

Deep neural net.orks excel at.image ident.ficat.on and comput.r vision applicat.ons such as visual product.search, facial recognit.on, medical image analysis, object.det.ct.on, semant.c segment.t.on,inst.nce segment.t.on, and many ot.ers. In image and video recognit.on applicat.ons, convolut.onal neural net.orks(CNNs) are widely employed. t.ese net.orks provide bet.er performance but.at.a higher cost.of comput.t.on. Wit. t.e advent.of big dat., t.e growing scale of dat.set. has made processing and model t.aining a t.me-consuming operat.on, result.ng in longer t.aining t.mes. Moreover, t.ese large scale dat.set. cont.in redundant.dat. point. t.at.have minimum impact.on t.e final out.ome of t.e model. t. address t.ese issues, an accelerat.d CNN syst.m is proposed for speeding up t.aining by eliminat.ng t.e noncrit.cal dat. point. during t.aining alongwit. a model compression met.od. Furt.ermore, t.e ident.ficat.on of t.e crit.cal input.dat. is performed by aggregat.ng t.e dat. point. at.t.o levels of granularit. which are used for evaluat.ng t.e impact.on t.e model *** experiment. are conduct.d using t.e proposed met.od on CIFAR-10 dat.set.on ResNet.models giving a 40% reduct.on in number of FLOps wit. a degradat.on of just.0.11% accuracy.

关键词： CNN deep learning image classificat.on model compression

On t.e funct.ons of ast.ocyt.-mediat.d neuronal slow inward current.

在线全文

学校读者我要写书评

暂无评论

Neural Regenerat.on Research 2024年第12期19卷 2602-2612页

作者： Balázs pál Depart.ent.of physiology Faculty of MedicineUniversity of DebrecenDebrecenHungary

Slow inward current. are known as neuronal excit.t.ry current. mediat.d by glut.mat. release and act.vat.on of neuronal ext.a synapt.c N-met.hyl-D-aspart.t. recept.rs wit. t.e cont.ibut.on of *** event. are significant.y slower t.an t.e excit.t.ry post.ynapt.c *** of slow inward current. are det.rmined by seve ral fact.rs including t.e mechanisms of ast.ocyt.c act.vat.on and glut.mat. release,as well as t.e diffusion pat.ways from t.e release sit. t.wards t.e ext.a synapt.c recept. *** are st.mulat.d by neuronal net.ork act.vit.,which in t.rn excit. neurons,forming an ast.ocyt.-neuron feedback *** as a consequence of brain edema,ast.ocyt.c swelling can also induce slow inward current. under pat.ological *** is a growing body of evidence on t.e roles of slow inward current. on a single neuron or local net.ork *** event. oft.n occur in synchro ny on neurons locat.d in t.e same ast.ocyt.c *** synchronizat.on of neuronal excit.bilit.,slow inward current. also set.synapt.c st.engt. via elicit.ng t.ming-dependent.synapt.c *** addit.on,slow inward current. are also subject.t. non-synapt.c plast.cit. t.iggered by long-la st.ng st.mulat.on of t.e excit.t.ry *** not.,t.ere might.be import.nt.regionspecific differences in t.e roles and act.ons t.iggering slow inward *** great.r net.orks,t.e pat.ophysiological roles of slow inward current. can be bet.er underst.od t.an physiological *** inward current. are ident.fied in t.e pat.ophysiological background of aut.sm,as slow inward current. drive early hypersynchrony of t.e neural *** inward current. are significant.cont.ibut.rs t. paroxysmal depolarizat.onal shift./int.rict.l *** event. are relat.d t. epilepsy,but.also found in Alzheimer's disease,parkinson's disease,and st.oke,leading t. t.e decline of cognit.ve *** wit. feat.res overlapping wit. slow inward current.(excit.t.ry,N-met.yl-Dasp

关键词： ast.ocyt. cort.cal spreading depolarizat.on gliot.ansmission glut.mat. neural synchronizat.on NMDA recept.r paroxysmal depolarizat.onal shift slow inward current

Met.ology for sub-Rayleigh-lengt. t.rget.posit.oning in~10^(22)W/cm^(2)laser-plasma experiment.

在线全文

学校读者我要写书评

暂无评论

High power Laser Science and Engineering 2024年第3期12卷 90-105页

作者： E.A.Vishnyakov A.Sagisaka K.Ogura t.Zh.Esirkepov B.Gonzalez-Izquierdo C.D.Armst.ong t.A.pikuz S.A.pikuz W.Yan t.M.Jeong S.Singh p.Hadjisolomou O.Finke G.M.Grit.ani M.Nevrkla C.M.Lazzarini A.Velyhan t.Hayakawa Y.Fukuda J.K.Koga M.Ishino K.Kondo Y.Miyasaka A.Kon M.Nishikino Y.V.Nosach D.Khikhlukha I.p.t.ygvint.ev D.Kumar J.Nejdl D.Margarone p.V.Sasorov S.Weber M.Kando H.Kiriyama Y.Kat. G.Korn K.Kondo S.V.Bulanov t.Kawachi A.S.pirozhkov ELI Beamlines Facilit. The Extreme Light Infrastructure ERICDolníBrežanyCzech Republic Kansai Inst.t.t. for phot.n Science(KpSI) QSTKyotoJapan Cent.al Laser Facilit. Rutherford Appleton LaboratorySTFCHarwell OxfordDidcotUK Inst.t.t. for Open and t.ansdisciplinary Research Init.at.ves Osaka UniversityOsakaJapan HB11 Energy Holdings FreshwaterAustralia Key Laborat.ry for Laser plasmas(Minist.y of Educat.on) School of Physics and AstronomyShanghai Jiao Tong UniversityShanghaiChina Collaborat.ve Innovat.on Cent.r of IFSA Shanghai Jiao Tong UniversityShanghaiChina Inst.t.t. of plasma physics ASCR PragueCzech Republic FZU-Inst.t.t. of physics ASCR PragueCzech Republic Czech t.chnical Universit. in prague FNSPEPragueCzech Republic Inst.t.t. of Laser Engineering Osaka UniversityOsakaJapan Inst.t.t. of physics National Academy of Sciences of UkraineKyivUkraine ISt.Q AR YerevanArmenia

t.ght.focusing wit. very small f-numbers is necessary t. achieve t.e highest.at.focus ***,t.ght.focusing imposes st.ong demands on precise t.rget.posit.oning in-focus t. achieve t.e highest.on-t.rget.irradiance We describe several near-infrared,visible,ult.aviolet.and soft.and hard X-ray diagnost.cs employed in a~10^(22)W/cm^(2)laser±plasma *** used nearly 10 J t.t.l energy femt.second laser pulses focused int. an approximat.ly1.3-μm focal spot.on 5±20μm t.ick st.inless-st.el *** discuss t.e applicabilit. of t.ese diagnost.cs t. det.rmine t.e best.in-focus t.rget.posit.on wit. approximat.ly 5μm accuracy(i.e.,around half of t.e short.Rayleigh lengt.)and show t.at.several diagnost.cs(in part.cular,3ωreflect.on and on-axis hard X-rays)can ensure t.is *** demonst.at.d t.rget.posit.oning wit.in several micromet.rs from t.e focus,ensuring over 80%of t.e ideal peak laser int.nsit. *** approach is relat.vely fast.it.requires 10±20 laser shot.)and does not.rely on t.e coincidence of low-power and high-power focal planes.

关键词： laser-plasma int.ract.on precise t.rget.posit.oning spect.oscopy ult.a-high int.nsit. X-rays