检索结果-南通市图书馆

h.rdness of Mn_2V_2O_7 th.n fi.ms and i.s i.fluenti.l factors

在线全文

学校读者我要写书评

暂无评论

i.ternati.nal Journal of Mi.erals,Metallurgy and Materi.ls 2015年第9期22卷 987-991页

作者： i. Aft i. Kari.er Department of Sci.nce Educati.n Faculty of Education Erciyes University Kayseri 38039 Turkey

Mn2V2O7 th.n fi.ms were deposi.ed onto amorph.us glass substrates usi.g a ch.mi.al bath.deposi.i.n meth.d and di.ferent deposi.i.n ti.e. X-ray di.fracti.n （XRD） analysi. was used to defi.e th. structure of th. fi.ms. Th.i. rough.ess, th.ckness, and surface properti.s were evaluated th.ough.atomi. force mi.roscopy （AFM）. Th. h.rdness of th. fi.ms was measured usi.g a nanoh.rdness tester Th. fi.m th.ckness, average grai. si.e, and rough.ess were posi.i.ely correlated wi.h.each.oth.r. Th.se th.ee parameters were observed to i.crease wi.h.th. deposi.i.n ti.e. Th. fi.m th.ckness and average grai. si.e were i.versely correlated wi.h.th. h.rdness and rough. ness. i. addi.i.n, th. number of crystalli.es per uni. area and th. di.locati.n densi.y were observed to be posi.i.ely correlated wi.h.th. h.rdness and rough.ess. Th.s study was desi.ned to eluci.ate and formali.e th. underlyi.g reasons for th.se relati.nsh.ps.

关键词： manganese vanadate th.n fi.ms nanoh.rdness i.fluenci.g factors

Vi.cous Dark Energy Models wi.h.Vari.ble G and A

在线全文

学校读者我要写书评

暂无评论

Ch.nese Ph.si.s Letters 2008年第10期25卷 3834-3836页

作者： Arbab i. Arbab Department of Ph.si.s Faculty of Science University of Khartoum PO Box 321 Khartoum 11115 SudanDepartment of Physics and Applied Mathematics Faculty of Applied Sciences and Computer Omdurman Ahlia University PO Box 7S6 Omdurman Sudan

We consi.er a cosmologi.al model wi.h.bulk vi.cosi.y η and vari.ble cosmologi.al A ∝p^-α, alph. = const and gravi.ati.nal G constants. Th. model exh.bi.s many i.teresti.g cosmologi.al features. i.flati.n proceeds du to th. presence of bulk vi.cosi.y and dark energy wi.h.ut requi.i.g th. equati.n of state p =-p. Duri.g th. i.flati.nary era th. energy densi.y p does not remai. constant, as i. th. de-Si.ter type. Moreover, th. cosmologi.al and gravi.ati.nal constants i.crease exponenti.lly wi.h.ti.e, wh.reas th. energy densi.y and vi.cosi.y decrease exponenti.lly wi.h.ti.e. Th. rate of mass creati.n duri.g i.flati.n i. found to be very h.ge suggesti.g th.t all matter i. th. uni.erse i. created duri.g i.flati.n.

关键词： th. power-law exponents preci.i.ati.n durati.e abrupt preci.i.ati.n ch.nge

Mh. and ki.eti. analysi. of flow bursts i. th. Earth.s plasma sh.et

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

Sci.nce Ch.na(Tech.ologi.al Sci.nces) 2014年第1期57卷 55-66页

作者： MA YuDuan CAO Ji.Bi. FU h.i.h.n REME h. DANDOURAS i. YANG JunYi.g WANG Zh.Qi.ng TAO Dan YANG Ji.n Sch.ol of Astronauti.s Beihang University SOA Key Laboratory for Polar Sci.nce Polar Research Institute of China Uni.ersi.y of Toulouse UPS-OMP IRAP Toulouse 31028 France Th. French.Nati.nal Centre for Sci.nti.i. Research The Research Institute in Astrophysics and Planetology BP 44346F-31028 Toulouse cedex 4 France Nanji.g Uni.ersi.y of Aeronauti.s and Astronauti.s

i. an attempt to study th. flow bursts i. th. Earth.s plasma sh.et we select an event th.t took place on August 7, 2004 i. th. expansi.n ph.se of a substorm, usi.g data from th. geomagneti. i.dex, solar wi.d data, plasma and magneti. fi.ld observa- ti.ns from C1 Cluster satelli.e （th. Cluster mi.si.n h.s 4 satelli.es） and from Double Star TC-1 satelli.e. i. Mh. approach. TC-1 fi.stly observed th. tai.ward flow, th.n th. earth.ard, and fi.ally th. flow altemated i. two di.ecti.ns. C1 fi.stly ob- served th. earth.ard plasma flow, and th.n th. tai.ward plasma flow. Before flow bursts are observed by TC-1 and C1, th.re are di.turbances i. local entropy wi.h.th.i. tai.ward local entropy larger th.n th.se of th. earth.ard. Th. ki.eti. features of th. plasma flow observed by C1 are si.i.ar to th.se i. Mh.. h.wever, ki.eti. ch.racteri.ti.s of th. plasma flow observed by TC-1 are far more th.n th. descri.ti.n i. Mh.. Th. i.adequacy mai.ly exi.ts i. two cases：（i. th. fi.stly enh.nced tai.ward flows gi.en i. Mh. are found wi.h.ut si.ni.i.ant i.crease of th. energeti. tai.ward flux; （i.） th. almost stagnant flow i. Mh. i. composed of th. enh.nced energeti. i.n flux i. both.earth.ard and tai.ward di.ecti.ns. Th. earth.ard flow burst observed by TC-1 mi.h. be multi.le oversh.ots and rebounds. Th. earth.ard flow burst observed by C1 mi.h. be si.ply rebounded i. th. near-Earth. Th. pulsati.n observed by C1 i. earli.r th.n th.t observed by TC-1 wi.h.th. former i.tensi.y less th.n th.t of th. latter. After th. energeti. i.n flux i. th. tai.ward di.ecti.n i. si.ni.i.antly enh.nced, th. power spectrum i.tensi.y of th. ULF wave commences to i.crease obvi.usly, wh.ch.may suggest th.t th. stream i.stabi.i.y i. closely correlated wi.h.ULF pulsati.ns.

关键词： Mh. ki.eti. flux entropy

Ph.ntom Energy wi.h.Vari.ble G and A

在线全文

学校读者我要写书评

暂无评论

Ch.nese Ph.si.s Letters 2008年第12期25卷 4497-4500页

作者： Arbab i. Arbab Department of Ph.si.s Faculty of Science University of Khartoum P.O. Box 321 Khartoum 11115 Sudan 2.Department of Ph.si.s and Appli.d Math.mati.s Faculty of Applied Sciences and Computer Omdurman Ahlia University P.O. Box 786 Omdurman Sudan

We i.vesti.ate a cosmologi.al model of a ph.ntom energy wi.h.a vari.ble cosmologi.al constant （∧） dependi.g on th. energy densi.y （ρ） as ∧∝ρ^α,α=const and a vari.ble gravi.ati.nal constant G. Th. model requi.es α 〈 0 and a negati.e gravi.ati.nal constant. Th. cosmologi.al constant evolves wi.h.ti.e as ∧ ∝ t^-2. For ω 〉 - 1 and α 〈 -1 th. cosmologi.al constant ∧ 〈 0, G 〉 0 and ρ decrease wi.h.cosmi. expansi.n. For ordi.ary energy （or dark energy）, i.e.ω 〉 -1, we h.ve -1 〈 α〈 0 and β 〉 0 so th.t G〉0 i.creases wi.h.ti.e and p decreases wi.h.ti.e. Cosmi. accelerati.n wi.h.dust parti.les i. granted, provi.ed -2/3 〈α〈 0 and ∧〉0.

关键词： fi.ld emi.si.n molybdenum di.xi.e enh.ncement factor

Apoli.oprotei. A-i.bi.di.g protei.-medi.ted neuroprotecti.n i. glaucomatous neuroi.flammati.n and neurodegenerati.n

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

Neural Regenerati.n Research 2025年第5期20卷 1414-1415页

作者： Si.woo h.ang Seungh.an Ch.i.Soo-h. Ch.i.Keun-Young Ki. Yury i.Mi.ler Won-Kyu Ju h.mi.ton Glaucoma Center and Sh.ley Eye i.sti.ute The Viterbi Family Department of OphthalmologyUniversity of California San DiegoLa JollaCAUSA Department of Medi.i.e University of California San DiegoLa JollaCAUSA Nati.nal Center for Mi.roscopy and i.agi.g Research Department of NeurosciencesUniversity of California San DiegoLa JollaCAUSA

Glaucoma i. a multi.actori.l eye di.order th.t can cause vi.i.n loss and i.reversi.le bli.dness,affecti.g i.di.i. uals aged 40 to 80 yea rs *** to th. agi.g populati.n,i. i. expected th.t th. number of people affected by glaucoma wi.l surpass 111 mi.li.n by 2040 as th. di.ease becomes more *** pri.ari.y contri.utes to opti. nerve axon loss and th. progressi.e degenerati.n of reti.al gangli.n cells (RGCs),subsequently leadi.g to vi.i.n i.pai.ment.

关键词： i.reversi.le pass pri.ari.y

Ph.toproducti.n of mesons off th. deuteron:quasi.ree and coh.rent processes

在线全文

学校读者我要写书评

暂无评论

Ch.nese Ph.si.s C 2009年第12期33卷 1340-1344页

作者： i. Jaeglé Departmement of Ph.si.s University of Basel CH-4056 Basel Switzerland

Ph.toproducti.n of mesons off th. deuteron h.s been i.vesti.ated at a tagged ph.ton beam of th. Bonn ELSA accelerator wi.h.th. combi.ed Crystal Barrel - TAPS electromagneti. calori.eter for i.ci.ent ph.ton energi.s up to 2.5 GeV. Th. mesons h.ve been detected i. coi.ci.ence wi.h.recoi. protons, neutrons and deuterons. Th.s allow th. measurement of meson producti.n reacti.ns off th. quasi.ree nucleons bound i. th. deutron, as well as th. coh.rent producti.n off th. deuteron. Th. compari.on of quasi.ree proton reacti.ns to free proton reacti.ns can confi.m or i.vali.ate possi.le nuclear effects on th. extracted cross secti.n reacti.ns. Furth.rmore th. i.ospi. composi.i.n of a resonance can be esti.ated from th. compari.on of quasi.ree proton and neutron reacti.ns. Th. quasi.ree ph.toproducti.n of th. η＇ and π°η mesons off nucleons and th. coh.rent ph.toproducti.n of π°η--pai.s off th. deuteron are di.cussed.

关键词： quasi.ree coh.rent ph.toproducti.n η' π°η neutron proton deuteron

Natural frequenci.s of composi.e beams wi.h.a vari.ble fi.er volume fracti.n i.cludi.g rotary i.erti. and sh.ar deformati.n

在线全文

学校读者我要写书评

暂无评论

Appli.d Math.mati.s and Mech.ni.s(Engli.h.Edi.i.n) 2009年第6期30卷 717-726页

作者： Y. Bedji.i.i.A. Tounsi.h. M. Berrabah.i. Mech.b E. A. Adda Bedi. S. Benai.sa Uni.ersi.é de Tlemcen Faculté des Sciences de l'ingénieurDépartement de Génie MécaniqueAlgérie Laboratoi.e des Matéri.ux et h.drologi. Université de Sidi Bel AbbesAlgérie Laboratoi.e de Math.mati.ues Université de Sidi Bel AbbesAlgérie

Th. present study i. concerned wi.h.th. vi.rati.n analysi. of symmetri. composi.e beams wi.h.a vari.ble fi.er volume fracti.n th.ough.th.ckness. Fi.st-order sh.ar deformati.n and rotary i.erti. h.ve been i.cluded i. th. analysi.. Th. soluti.n procedure i. appli.able to arbi.rary boundary condi.i.ns. Conti.uous gradati.n of th. fi.er volume fracti.n i. modeled i. th. form of an m-th.power polynomi.l of th. coordi.ate axi. i. th. th.ckness di.ecti.n of th. beam. By varyi.g th. fi.er volume fracti.n wi.h.n th. symmetri. composi.e beam to create a functi.nally graded materi.l （FGM）, certai. vi.rati.n ch.racteri.ti.s are affected. Results are presented to demonstrate th. effects of sh.ar deformati.n, fi.er volume fracti.n, and boundary condi.i.ns on th. natural frequenci.s and mode sh.pes of composi.e beams.

关键词： free vi.rati.n functi.nally graded materi.ls fi.st-order sh.ar deformati.nth.ory

i.acti.ati.n of i.fecti.us bursal di.ease vi.us by bi.ary eth.leni.i.e and formali.

在线全文

学校读者我要写书评

暂无评论

Journal of Zh.ji.ng Uni.ersi.y-Sci.nce B(Bi.medi.i.e & Bi.tech.ology) 2006年第4期7卷 320-323页

作者： h.Bi. M. h.SSAi. i. FANG W.h. RAJPUT Z.i. YANG Z.Z. i.Sh.D h. Department of Veteri.ary Mi.robi.logy University of Agriculture Faisalabad 38040 Pakistan） i.sti.ute of Preventi.e Veteri.ary Medi.i.e Zhejiang University Hangzhou 310029 China Department of Li.estock and Fi.h.ri.s Animal Husbandry Sindh Hyderabad 71000 Pakistan

i. th.s experi.ent conducted to study th. i.acti.ati.n dynami.s of i.fecti.us bursal di.ease vi.us （i.DV） by bi.ary eth.leni.i.e （BEi. i. compari.on wi.h.formali., i.DV was i.olated from th. bursa of i.fected ch.ckens and i.s confi.mati.n was done by agar gel preci.i.ati.n test. Vi.al suspensi.ns were subjected to i.acti.ati.n wi.h.BEi.and formali. for pre-set ti.e i.- tervals. BEi.was employed at concentrati.ns of 0.001 and 0.002 mol/L wh.le formali. was used at 0.1% and 0.2%. Sampli.g was done at 6, 12, 24, 36 and 48 h.of i.cubati.n and samples were tested for th.i. i.acti.ati.n status i. 9-day-old embryonated eggs and 3-week-old broi.er ch.ckens. i.DV was completely i.acti.ated by 0.001 and 0.002 mol/L BEi.after 36 h.of i.cubati.n at 37℃, wh.reas formali. at 0. 1% and 0.2% concentrati.ns i.acti.ated i.DV i. 24 h.

关键词： i.fecti.us bursal di.ease vi.us (i.DV) Bi.ary eth.leni.i.e (BEi. i.acti.ati.n

Compari.on of arti.i.i.l neural networks wi.h.empi.i.al correlati.ns for esti.ati.g th. average cycle ti.e i. coni.al spouted beds

在线全文

学校读者我要写书评

暂无评论

Parti.uology 2019年第1期17卷 48-57页

作者： i. Esti.ti. M. Tellabi.ea J.F. Saldarri.ga h. Altzi.ara F.B. Frei.ec J.T. Frei.ec M. Olazara Department of Ch.mi.al Engi.eeri.g University of the Basque CountryP.O. box 644E48080 BilbaoSpain Department of Ci.i. and Envi.onmental Engi.eeri.g Universidad de los AndesCr.1 Este 19A-40BogotaColombia Department of Ch.mi.al Engi.eeri.g Federal University of Sao CarlosRod. Washington Luis-km 235P.O. box 67613565-905Sao CarlosSPBrazil

Conventi.nal spouted beds h.ve been extensi.ely used i. many real-li.e appli.ati.ns but are not sui.ed for all types of materi.ls, especi.lly fi.e parti.les, wh.ch.requi.e i.ternal devi.es to i.prove th.i. moti.n i. th. spouted bed. h.wever, unli.e conventi.nal spouted beds, th.re are almost no mech.ni.ti. or empi.i.al models avai.able for th. desi.n of spouted beds wi.h.i.ternals. Gi.en th. avai.abi.i.y of an extensi.e but not experi.entally desi.ned database, th. mai. purpose of th.s study i. to present an analysi. of neural networks and empi.i.al models i. terms of th.i. sui.abi.i.y to fi. and predi.t average cycle ti.es i. coni.al spouted beds wi.h.and wi.h.ut draft tubes. Th. parameters i.vesti.ated are parti.le si.e, densi.y, contactor angle, gas i.let di.meter, stati. bed h.i.h., and draft tube features. Alth.ugh.th. amount of i.formati.n i. always a key factor wh.n fi.ti.g models, th. si.e of th. database used i. th.s study strongly affects th. fi.ti.g performance of empi.i.al models, wh.reas arti.i.i.l neural networks are more i.fluenced by h.w th. data are scaled. Results of model veri.i.ati.n sh.w th.t both.tech.i.ues are sui.able for predi.ti.g average cycle ti.es for data outsi.e th. range covered by th. database.

关键词： Empi.i.al correlati.n Arti.i.i.l neural network Average cycle ti.e Coni.al spouted bed Draft tubes Modeli.g