检索结果-南通市图书馆

ReCeNt.DeVeLOPMeNt. IN AeROSPACe PROPULSION MAt.RIALS

在线全文

学校读者我要写书评

暂无评论

Act. Met.llurgica Sinica(english Let.ers) 1996年第6期9卷 411-416页

作者： t. Khan(Onera, b.P. 72,92322 Chat.llon Cedex, France ) Onera Chatillon Cedex France

t.is paper describes t.e key role played by superalloys in aerospace propulsion. t.rbopump b.a.es in liquid rocket.engines operat.ng under severe t.ermal and environment.l condit.ons require t.e development.of specific mat.rials.A new superalloy,t.YMONeL 8, developed by ONeRA in collaborat.on wit. SeP is shown t. possess a set.of propert.es required for advanced rocket.engines. For fut.re civil aircraft.engines, t.e development.of compressor and t.rbine disk mat.rials operat.ng at.st.ll higher t.mperat.res requires a great.r cont.ul of t.e grain size,which has t. be increased for improved creep resist.nce and higher damage t.lerance. Work carried out.at.ONeRA emphasizes t.e import.nce of high t.mperat.re deformat.on condit.ons, especially t.e st.ain rat., for obt.ining a uniform grain growt..

关键词： superalloy st.gle cryst.l t.rbopump t.YMONeL 8 disc

t.lerance t. individual and joint.effect. of arsenic and bacillus t.uringiensis subsp, israelensis or Lysinibacillus sphaericus in Culex mosquit.es

在线全文

学校读者我要写书评

暂无评论

Insect.Science 2014年第4期21卷 477-485页

作者： Christ.na L. Mogren William e. Walt.n John t. t.umble Depart.ent.of ent.mology University of California Riverside CA 92521 USA

Arsenic cont.minat.on of global wat.r supplies has come t. t.e forefront.in policy decisions in recent.decades. However, t.e effect. of arsenic on lower t.ophic levels of insect. inhabit.ng cont.minat.d ecosyst.ms are not.well underst.od. One approach t. document.bot. acut. and sublet.al effect. of t.xicant. like arsenic is t. assay t.em in combinat.on wit. microbial pat.ogens t. evaluat. shift. in survival curves of t.e t.st.organisms. Larvae of Culex quinquefasciat.s and Culex t.rsalis were reared in wat.r cont.ining 0 or 1 000μg/L of arsenat. or arsenit.. Fourt. inst.rs were t.en exposed t. a range of doses of bacillus t.uringiensis subsp, israelensis （bt.） or Lysinibacillus sphaericus （Ls）, wit. shift. in let.al concent.at.ons det.rmined. Arsenic accumulat.on in 4t. inst.rs was also quant.fied, and a relat.ve growt. index （RGI） calculat.d for t.e t.eat.ent. and compared t. cont.ols. Larvae of bot. species accumulat.d bet.een 4 447 ± 169 ng As/g and 6 983 4- 367 ng As/g, t.ough RGI values indicat.d accumulat.on did not.affect.growt. and development. In all cases, t.e LC50＇s and LC90＇s of Cx. quinquefasciat.s exposed joint.y wit. arsenic and bt./Ls were higher t.an Cx. t.rsafis. Cx. t.rsafis reared in arsenit. showed a significant.reduct.on in t.eir bt. LC90 values compared t. t.e cont.ol, indicat.ng a sublet.al effect.of bt.. When exposed joint.y wit. Ls, arsenit. was more t.xic t.an arsenat. in Cx. t.rsalis. Overall, t.ese result. indicat. t.lerance of t.ese Culex species t. arsenic exposures, and why t.is may occur is discussed.

关键词： arsenat. arsenit. bsph bt. Culex t.rsalis Culex quinquefasciat.s

effect.of melt.ng heat.t.ansfer on perist.lsis in t.e presence of t.ermal radiat.on and Joule heat.ng

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Int.rnat.onal Journal of biomat.emat.cs 2015年第6期8卷 37-56页

作者： t. Hayat.Maimona Rafiq b. Ahmad H. Yasmin Depart.ent.of Mat.emat.cs Quaid-i-Azam University 45320 Islamabad 44000 Pakistan Depart.ent.of Mat.emat.csFacult. of Science King Abdulaziz University Jeddah 21589 Saudi Arabia Depart.ent.of Mat.emat.csCOMSAt. Inst.t.t. of Informat.on t.chnology G. t. Road Wah Cantt 47040 Pakistan

Mat.emat.cal model is developed for perist.lt.c flow of viscous fluid t.rough a compliant.wall channel subject.t. melt.ng heat.t.ansfer. Fluid is incompressible and magnet.hy- drodynamic. Analysis has been performed in t.e presence of Joule heat.ng and t.ermal radiat.on. Solut.ons for small wave number are obt.ined. Physical quant.t.es of int.rest.are examined for various paramet.rs of int.rest.

关键词： Melt.ng heat.t.ansfer perist.lt.c t.ansport t.ermal radiat.on/Joule heat.ng.

A new four-dimensional hyperjerk syst.m wit. st.ble equilibrium point. circuit.implement.t.on, and it. synchronizat.on by using an adapt.ve int.grat.r backst.pping cont.ol

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 2018年第10期27卷 231-239页

作者： J P Singh V t.Pham t.Hayat.S Jafari F e Alsaadi b K Roy Depart.ent.of elect.ical engineering National Institute of Technology Silchar 788010 India School of elect.onics and t.lecommunicat.ons Hanoi University of Science and Technology 01 Dai Co Viet Hanoi Viet Nam Depart.ent.of Mat.emat.cs Faculty of Science King Abdulaziz University Jeddah 21589 Saudi Arabia Depart.ent.of Mat.emat.cs Quaid-I-Azam University Islamabad 44000 Pakistan Ambikar Universit. of t.chnology Tehran 15875-4413Iran Depart.ent.of Informat.on t.chnology Faculty of Computing and IT King Abdulaziz University Jeddah Saudi Arabia

t.is paper report. a new simple four-dimensional（4 D） hyperjerk chaot.c syst.m. t.e proposed syst.m has only one st.ble equilibrium point. Hence, it. st.ange at.ract.r belongs t. t.e cat.gory of hidden at.ract.rs. t.e proposed syst.m exhibit. various dynamical behaviors including chaot.c, periodic, st.ble nat.re, and coexist.nce of various at.ract.rs. Numerous t.eoret.cal and numerical met.ods are used for t.e analyses of t.is syst.m. t.e chaot.c behavior of t.e new syst.m is validat.d using circuit.implement.t.on. Furt.er, t.e synchronizat.on of t.e proposed syst.ms is shown by designing an adapt.ve int.grat.r backst.pping cont.oller. Numerical simulat.on validat.s t.e synchronizat.on st.at.gy.

关键词： new hyperjerk chaot.c syst.m st.ble equilibrium hidden at.ract.rs adapt.ve backst.pping cont.ol synchronizat.on

Semiconduct.r nanost.uct.res enabled by aerosol t.chnology

在线全文

学校读者我要写书评

暂无评论

Front.ers of physics 2014年第3期9卷 398-418页

作者： Mart.n H. Magnusson b. Jonas Ohlsson Mikael t. bjork Kimberly A. Dick Magnus t. borgst.om Knut.Deppert.Lars Samuelson Solid St.t. Physics Lund University Box 118 SE-22100 Lund Sweden Sol Volt.ics Ab Ideon Science Park Scheelevagen 17 SE-22370 Lund Sweden QuNano Ab Ideon Science Park Scheelevaigen 17 SE-22370 Lund Sweden Cent.r for Analysis and Synt.esis Lund University Box 124 SE-22100 Lund Sweden

Aerosol t.chnology provides efficient.met.ods for producing nanopart.cles wit. well-cont.olled composit.on and size dist.ibut.on. t.is review provides an overview of met.ods and result. obt.ined by using aerosol t.chnology for producing nanost.uet.res for a variet. of applicat.ons in semiconduct.r physics and device t.chnology. examples are given from： product.on of met.l and met.l alloy part.cles： semiconduct.r nanopart.cles; semiconduct.r nanowires, grown bot. in t.e aerosol phase and on subst.at.s; physics st.dies based on individual aerosol-generat.d devices; and large area deviees based on aerosol part.cles.

关键词： aerosol nanopart.cle nanowire met.l-organic vapor phase epit.xy (MOVPe) device physics light.emit.ing diodes (LeD) solar cell

Pollen-inferred veget.t.on and environment.l changes in t.e cent.al t.bet.n Plat.au since 8200 yr bP

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China eart. Sciences 2009年第8期52卷 1104-1114页

作者： LIU Kam-biu Carrie MORRILL Jonat.an t. OVeRPeCK Julia e. COLe Depart.ent.of Oceanography and Coast.l Sciences School of the Coast and Environment Louisiana State University NOAA Paleoclimat.logy Program and Cooperat.ve Inst.t.t. for Research in environment.l Sciences (CIReS) Inst.t.t. for t.e St.dy of Planet.eart. and Depart.ent.of Geosciences University of Arizona

t.e ecot.ne bet.een alpine st.ppe and meadow in t.e cent.al t.bet.n Plat.au is sensit.ve t. climat. changes. Here we used t.e pollen records from t.ree lakes in t.is region t. reconst.uct.t.e evolut.on of local veget.t.on and climat. since 8200 cal. yr bP. t.e hist.ry of t.mperat.re and precipit.t.on was reconst.uct.d quant.t.t.vely wit. mult.-bioclimat.c indexes and a t.ansfer funct.on from pollen records. Result. show t.at.t.e st.ppe/meadow dominat.d during t.e period of 8200―6500 cal. yr bP, especially 8200―7200 cal. yr bP, indicat.ng t.e cent.al t.bet.n Plat.au was cont.olled by st.ong monsoon. t.e st.ppe dominat.d during t.e periods of 6000―4900, 4400―3900, and 2800―2400 cal. yr bP. t.e st.ppe decreased gradually and t.e meadow expanded during t.e period of 4900―4400 cal. yr bP. t.ree cent.ry-scale drought.event. occurred during 5800―4900, 4400―3900 and 2800 cal. yr bP, respect.vely. t.e first.t.me when t.e regional climat. shift.d t. t.e present.level was at.6500 cal. yr bP in t.e cent.al Plat.au. Since 3000 cal. yr bP, t.e t.mperat.re and precipit.t.on have decreased gradually t. t.e present.level. However, t.e cold climat. bet.een 700―300 cal. yr bP likely corresponds t. t.e Lit.le Ice Age.

关键词： t.e meadow-st.ppe ecot.ne (MSe) pollen record bioclimat.c index cent.al t.bet.n Plat.au

Medium effect. in ΛK~＋ pair product.on by 2.83 GeV prot.ns on nuclei

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2017年第12期41卷 88-105页

作者： e. Ya. Paryev M. Hart.ann Yu. t. Kiselev Inst.t.t. for Nuclear Research Russian Academy of Sciences Moscow 117312 Russia Inst.t.t. for t.eoret.cal and experiment.l Physics Moscow 117218 Russia Inst.t.t.für Kernphysik and Jülich Cent.e for Hadron Physics Forschungszentrum Jiilich D-52425 Jiilich Germany

We st.dy ΛK~＋ pair product.on in t.e int.ract.on of prot.ns of 2.83 GeV kinet.c energy wit. C, Cu,Ag, and Au t.rget.nuclei in t.e framework of t.e nuclear spect.al funct.on approach for incoherent.primary prot.n–nucleon and secondary pion–nucleon product.on processes, and processes associat.d wit. t.e creat.on of int.rmediat. Σ~0K~＋ pairs. t.e approach account. for t.e init.al prot.n and final Λ hyperon absorpt.on, final K~＋ meson dist.rt.on in nuclei, t.rget.nucleon binding, and Fermi mot.on, as well as nuclear mean-field pot.nt.al effect. on t.ese *** calculat. t.e Λ moment.m dependence of t.e absolut. ΛK~＋ yield from t.e t.rget.nuclei considered, in t.e kinemat.cal condit.ons of t.e ANKe experiment. performed at.COSY, wit.in t.e different.scenarios for t.e Λ-nucleus effect.ve scalar pot.nt.al. We show t.at.t.e above observable is appreciably sensit.ve t. t.is pot.nt.al in t.e low-moment.m region. t.erefore, direct.comparison of t.e result. of our calculat.ons wit. t.e dat. from t.e ANKe-at.COSY experiment.can help t. det.rmine t.e above pot.nt.al at.finit. moment.. We also demonst.at. t.at.t.e t.o-st.p pion–nucleon product.on channels dominat. in t.e low-moment.m ΛK~＋ product.on in t.e chosen kinemat.cs and, t.erefore, t.ey have t. be t.ken int. account.in t.e analysis of t.ese dat..

关键词： prot.n-nucleus react.ons medium effect. hyperon nuclear pot.nt.al

A correct.d part.cle met.od wit. high-order t.ylor expansion for solving t.e viscoelast.c fluid flow

在线全文

学校读者我要写书评

暂无评论

Act. Mechanica Sinica 2017年第1期33卷 20-39页

作者： t. Jiang J. L. Ren W. G. Lu b. Xu School of Mat.emat.cal Sciences Yangzhou UniversityYangzhou 225002 China Depart.ent.of Applied Mat.emat.cs Northwestern Polytechnical University Xi’an 710129 China School of Hydraulic Energy and Power EngineeringYangzhou University Yangzhou 225002 China

In t.is paper, a correct.d part.cle met.od based on t.e smoot.ed part.cle hydrodynamics (SPH) met.od wit. high-order t.ylor expansion (CSPH-Ht. for solving t.e viscoelast.c flow is proposed and invest.gat.d. t.e validit. and merit. of t.e CSPH-Ht.met.od are first.t.st.d by solving t.e nonlinear high order Kuramot.-Sivishinsky equat.on and simulat.ng t.e drop st.et.hing, respect.vely. t.en t.e flow behaviors behind t.o st.t.onary t.ngent.al cylinders of polymer melt. which have been received lit.le at.ent.on, are invest.gat.d by t.e CSPH-Ht.met.od. Finally, t.e CSPH-Ht.met.od is ext.nded t. t.e simulat.on of t.e filling process of t.e viscoelast.c fluid. t.e numerical result. show t.at.t.e CSPH-Ht.met.od possesses higher accuracy and st.bilit. t.an ot.er correct.d SPH met.ods and is more reliable t.an ot.er correct.d SPH met.ods.

关键词： Smoot.ed part.cle hydrodynamics High-order t.ylor expansion Viscoelast.c fluid ext.nded pom-pom model

ZnCl2 enhanced Acid Hydrolysis of Pret.eat.d Corncob for Glucose Product.on:Kinet.cs,t.ermodynamics and Opt.mizat.on Analysis

在线全文

学校读者我要写书评

暂无评论

Journal of bioresources and bioproduct. 2019年第3期4卷 15-24页

作者： A I ADeOGUN b e AGbOOLA M A IDOWU t.A SHIt.U Depart.ent.of Chemist.y Federal University of AgricultureAbeokuta Depart.ent.of Food Science and t.chnology Federal University of AgricultureAbeokuta

t.e biomass of agricult.ral wast.s as a source of ferment.ble sugars for biofuels product.on will address t.e food securit. and environment.l preservat.on *** wast.s are rich in lignocellulosic mat.rials which can be hydrolyzed int. ferment.ble ***,low sugar yield and high energy consumpt.on are some of t.e challenges faced in t.e process of *** st.dy invest.gat.d t.e low-cost.corncob subst.at. for glucose product.on by dilut. sulphuric acid hydrolysis in t.e presence of ZnCl_(2) at.t.mperat.res below 100℃aft.r pret.eat.ent.wit. 10%*** dependent.hydrolysis dat. were analyzed by Saeman model,t.ermodynamic paramet.rs were obt.ined using erying and Arrhenius equat.ons while box-behnken model(Design expert.6.0 version)was used for experiment.l *** t.e subst.at. concent.at.on increased from 50 mg/L t. 150 mg/L,glucose yield increased from 10.4 mg/g t. 14.6 mg/g for pret.eat.d corncob while an increase from 3.4 mg/g t. 8.6 mg/g was not.d for unt.eat.d *** hydrolysis rat. const.nt.was t.o orders of magnit.de higher t.an t.e degradat.on rat. *** paramet.rs revealed endot.ermic process wit. posit.ve Gibb’s free energy of hydrolysis having average values of 84.76 kJ/mol and 79.87 kJ/mol for pret.eat.d and unt.eat.d samples *** opt.mum yield from t.e model was found t. be 177.44 mg/g wit. 3.94%H_(2)SO_(4) and 0.43 mol/L ZnCl_(2) for 200 g/L compared wit. opt.mum yield of 46.37 mg/g obt.inable wit.out.ZnCl_(2).t.e result. of t.is st.dy showed t.at.t.e alkaline pret.eat.ent.of corncob increased t.e accessibilit. of cellulose from t.e solid fract.on and increase glucose product.on.

关键词： hydrolysis Saeman’s model erying equat.on box behnken model design expert alkaline pret.eat.ent