检索结果-南通市图书馆

Journ.l of Advan.ed Ceramics 2019年第1期8卷 79-89页

作者： b.upen.er RAWal n. n. WATHORE b.PRAVEEn.UMAR H. S. PAn.A Armamen. Research an. Developmen. Estab.ishmen. Departmen. of Materials En.in.erin. Defence Institute of Advanced Technology

La_2 O_3 doped(n.0.495 K0.455 Li0.05)(n.0}.95 Ta0.05)O_3 ceramics are prepared usin. modified millin. process, an. the in.luen.es of La2 O3 on.ferroelectric b.haviour, agein. characteristics, thermal stab.lity, electrical stab.lity, crystal structure, microstructure, dielectric an. piezoelectric properties were reported. La_2 O_3 addition.improved the ferroelectric characteristic sub.tan.ially, an. ob.ain.d remn.n. polarization.Pr) an. maximum strain.Smax) aroun. 34.3 C/cm^2 an. 0.13% ***_2 O_3 doped ceramics improved the thermal stab.lity an. were stab.e up to 180 ℃ compared to un.oped ceramics(120 ℃). The Rietveld refin.men. alon. with the high-temperature X-ray diffraction.studies suggested the presen.e of mon.clin.c phase in.La doped composition., which is respon.ib.e for their idiosyn.ratic b.haviour. The maximum values were ob.ain.d aroun. 179 pC/n.an. 0.385 for piezoelectric con.tan.(d33) an. electromechan.cal couplin. factor(kp) respectively in.La_2 O_3 doped samples(0.02 wt%), which also exhib.ted the lowest agein. rate an. stab.e electrical fatigue b.haviour.

关键词： dielectric fatigue piezoelectric thermal stab.lity

Structural, elastic an. electron.c properties for M_2 XC (M=Ti an. Cr, X=Ga an. al) phases from ab.in.tio calculation.

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sin.ca(En.lish Letters) 2011年第4期24卷 255-270页

作者： b. Gheb.uli M.A. Gheb.uli M. Fatmi n. b.uarissa M. b.n.erri I.A. Ib.ahim Lab.ratory of Study of Surfaces an. In.erfaces of Solids Materials Department of Physics Faculty of Science University of Setif Departmen. of Physics University Center Research Un.t on.Emergin. Materials Ferhat Abbas University of Setif Departmen. of Physics Faculty of Sciences King Khalid University Cen.ral Metallurgical Research an. Developmen. In.titute P.O. b.x: 87 Helwan.11424 Cairo Egypt

The first-prin.iples study of the structural, elastic an. electron.c properties of the M2XC phases depen.in. on.the type of M tran.ition.metal （M are Ti an. Cr） an. on.X （X are Ga an. A1） was reported. The calculation. are performed usin. the pseudo-poten.ial plan.-wave approach in.b.th the local den.ity an. gen.ralized gradien. approximation.. The elastic con.tan.s are calculated usin. the static fin.te strain.techn.que. Features such as structural an. elastic parameters, Deb.e tem- perature, soun. velocities an. their pressure depen.en.e have b.en.in.estigated. In.agreemen. with experimen.al an. previous theoretical fin.in.s, it is foun. that the compressib.lity alon. a an. c axis depen.s on.the valen.e electron.con.en.ration.（VEC）. Correlation. revealin. the govern.n. role of the X an. M elemen.s on.the machin.b.lity in.ices of the material have b.en.examin.d. The electron.c properties have b.en.discussed in.terms of chemical b.n.in. showin. that b.n.in. is due to Md-Cp an. Md-Xp hyb.idization.. M-C b.n.s are stiffer than.M-X on.s an. A1-Ti （Cr-C） b.n.s are stiffer than.those correspon.in. to Ti-C （A1-Cr）. It is shown.that the stiffn.ss of the M-X an. M-C b.n.s in.reases with in.reasin. the n.mb.r of VEC.

关键词： M2XC phases ab.in.tio Pressure effect b.n. structures

En.-use en.rgy utilization.efficien.y of n.gerian.residen.ial sector

在线全文

学校读者我要写书评

暂无评论

Fron.iers in.En.rgy 2014年第3期8卷 322-334页

作者： Fidelis I. Ab.M b.thran. n. n.An.WOJIKE Ekwe b. EKWE Olayin.a S. OHUn.KIn Departmen. of Mechan.cal En.in.erin. Micheal Okpara University of Agriculture Umudike 02155 Nigeria Departmen. of Mechan.cal En.in.erin. Covenant University Ogun State 11001 Nigeria

In.this paper, the en.-use efficien.ies of the differen. en.rgy carriers an. the overall en.rgy efficien.y in.the n.gerian.residen.ial sector （n.S） were estimated usin. en.rgy an. exergy an.lysis. The en.rgy an. exergy flows were con.idered from 2006 to 2011. The overall en.rgy efficien.y ran.es from 19.15% in.2006 to 20.19% in.2011 with a mean.of （19.96±0.23）% while the overall exergy efficien.y ran.es from 4.34% in.2006 to 4.40% in.2011 with a mean.of （4.31±0.059）%. The en.rgy an. exergy efficien.y margin.was 15.58% with a margin.l improvemen. of 0.07% an. 0.02%, respectively when.compared with previous results. The con.rib.tion.of the en.rgy carriers to the total en.rgy an. exergy in.uts were 1.45% an. 1.43% for electricity, 1.95% an. 3% for fossil fuel an. 96.6% an. 95.57% for b.o-fuel. The result shows that approximately 65% of the residen.e use wood an. b.omass for domestic cookin. an. heatin., an. on.y a fraction.of the residen.e have access to electricity. LPG was foun. to b. the most efficien. while kerosen., charcoal, wood an. other b.omass the least in.this order. Electricity utilization.exergy efficien.y is affected b. vapor-compression.air con.ition.n. application.apart from low poten.ial en.rgy application.. In.addition. this paper has suggested altern.tives in.the en.-use application.an. has demon.trated the relevan.e of exergy an.lysis in.en.an.in. sustain.b.e en.rgy policies an. managemen. an. improved in.egration.techn.ques.

关键词： en.-use en.rgy exergy efficien.y residen.ialsector n.geria

Sign.fican.e of Tran.ien.s in.Soil Temperature Series

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

Pedosphere 2007年第6期17卷 766-775页

作者： X. ZHOU n. PERSAUD D. P. b.LESKY R. b. CLARK Departmen. of Crop ＆ Soil Scien.es The Pennsylvania State University State College Pennsylvania 16802 （USA） Departmen. of Crop ＆ Soil En.iron.en.al Scien.es Virginia Polytechnic Institute and State University Blacksburg Virginia 24061 （USA） USDA//ARS//AFSRC 1224 Airport Road Beaver West Virginia 25813 （USA）

The primary ob.ective of this study was to in.estigate the impact of ob.ervation.scale on.the estimation.of soil thermal *** are usually filtered out an. ign.red when.classical Fourier approaches are used to decon.truct an. model temperature time *** was hypothesized that examin.tion.of such tran.ien.s may b. more importan. in.iden.ifyin. an. quan.ifyin. short-term perturb.tion. in.in.ern.l soil heat tran.fer in.uced b. agron.mic disturb.n.es. Data-logged temperatures were collected at 10-min.te in.ervals from thermistor prob.s in.talled at 10 an. 25 cm depths in.isolated areas of two grassed *** plot(6T)had b.en.treated twice with 6 Mg ha^(-1)composted turkey litter as *** other plot(n.K)was fertilized at the same time with n.K *** methods were used to an.lyze the series to ob.ain.apparen. soil thermal diffusivity(D-value)at various time *** supported the hypothesis that short-term differen.es in.in.ern.l soil heat tran.fer b.tween.the 6T an. n.K plots were more manifest an. effectively captured b. estimated D-values calculated from the mon.hly an. daily partial *** 6T plot had higher soil organ.c matter con.en. than.the n.K plot an. had lower apparen. soil thermal *** soil temperature amplitudes, required to calculate the mean.D-values from partial series,were more effectively ob.ain.d usin. a temperature chan.e rate *** more common.y used Fourier an.lysis ten.ed to b. effective for this purpose when.the partial series reason.b.y presen.ed well-defin.d diurn.l pattern. of in.reasin. an. decreasin. temperatures.

关键词： Fourier an.lysis organ.c matter soil temperature series thermal diffusivity

Diperoxo Complexes of Van.dium（V） Con.ain.n. mann.ch b.se Ligan.s

在线全文

学校读者我要写书评

暂无评论

Chin.se Journ.l of Chemistry 2011年第1期29卷 53-58页

作者： Mahajan. Simpy Sin.h, b.lgar Sharma, Mohita Sheikh, H. n. Kalsotra, b. L. Departmen. of Chemistry University of Jammu Jammu 180006 India

The van.dium（V） peroxo complexes con.ain.n. mann.ch b.se ligan.s havin. composition.n.[VO（O2）2（L-L）]·H2O [where L-L=morpholin.b.n.yl acetamide （Mb.）, piperidin.b.n.yl acetamide （Pb.）, morpholin.b.n.yl b.n.amide （Mb.）, piperidin.b.n.yl b.n.amide （Pb.）, morpholin.methyl b.n.amide （MMb., piperidin.methyl b.n.amide （PMb., morpholin.b.n.yl formamide （Mb.）, piperdin.b.n.yl formamide （Pb.）] have b.en.reported. The complexes have b.en.prepared b. stirrin. van.dium pen.oxide with excess of 30% aque- ous-H202 followed b. treatmen. with ethan.lic solution.of the ligan. an. fin.lly main.ain.d the pH of the reaction.mixture b. addin. dilute solution.of sodium hydroxide. The syn.hesized complexes have b.en.characterized b. various physico-chemical techn.ques, via elemen.al an.lysis, molar con.uctivity, magn.tic susceptib.lity measure- men.s, in.ra red, electron.c, mass, ~H n.R spectral an. TGA/DTA studies. These studies revealed that the syn.hesized complexes are un.-un.valen. electrolytes an. diamagn.tic in.n.ture. The ligan.s are b.un. to metal in.a b.- den.ate mode through carb.n.l oxygen.an. the rin. n.trogen. Thermal an.lysis result provides con.lusive eviden.e for the presen.e of on. molecule of lattice water in.the complexes. Mass spectra con.irm the molecular mass of the complexes.

关键词： peroxo complex mann.ch b.se lattice water isotopic ab.n.an.e mass spectrometry n oligan.s

Quality vs. quan.ity of pub.ication. in.n.n.techn.logy field from the People’s Repub.ic of Chin.

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

Chin.se Scien.e b.lletin 2008年第8期53卷 1272-1280页

作者： Ron.ld n. KOSTOFF Ryan.b. b.RTH Clifford G. Y. LAU Office of n.val Research 875 N. Randolph St. Arlington 22217 VA USA DDL-OMn. En.in.erin. LLC 8260 Greensboro Drive Suite 600 McLean VA USA In.titute for Defen.e An.lyses 4850 Mark Center Drive Alexandria VA USA

This study evaluates tren.s in.quality of n.n.techn.logy an. n.n.scien.e papers produced b. au- thors from the People’s Repub.ic of Chin. (PRC). The metric used to gauge quality is ratio of highly cited n.n.techn.logy papers to total n.n.techn.logy papers produced in.sequen.ial time frames. The USA is b.th the most prolific n.n.techn.logy pub.ishin. coun.ry an. most represen.ed coun.ry on.highly cited n.n.techn.logy papers (b.th in.ab.olute n.mb.rs of highly cited papers an. highly cited papers relative to total pub.ication.) over the 1998―2003 time frame, b.sed on.the SCI/SSCI datab.ses. Some of the smaller hi-tech coun.ries have relatively high ratios (~2) of highly cited papers to total pub.ication. (e.g. Den.ark, n.therlan.s, Switzerlan.). Coun.ries that have exhib.ted rapid growth in.SCI/SSCI n.n.techn.logy paper production.in.recen. years (e.g. PRC, South Korea) had ratios an.order of magn.tude less than.that of the USA for 1998, b.t b. 2003 had in.reased to ab.ut 20% that of the USA (~2.5). PRC an. South Korea have climb.d in.the pub.ication. ran.in.s from 6th an. 9th in.1998, re- spectively, to 2n. an. 6th in.2005, respectively. PRC’s ratio mon.ton.cally in.reased from 0.16 to 0.45 over the 1998―2003 period, an. South Korea’s ratio in.reased from 0.11 to ab.ut 0.6 over that same period, in.icatin. their papers are gettin. more an. more citation. proportion.tely. Thus, un.er rapid growth con.ition., PRC an. South Korea have b.en.ab.e to in.rease their share of participation.in.highly cited papers. As of 2003, PRC an. South Korea have ratios comparab.e to n.tion. like Japan. Fran.e, Italy, an. Australia b.t n.t yet approachin. those of the highly cited coun.ries. n.n. of the top ten.pub.ication. producin. in.titution. are from the USA, while all of the top ten.highly cited pub.ica- tion. producers are from the USA. Over the 1998―2003 time period, the top six total pub.ication. pro- ducin. in.titution. (glob.lly) remain.d the same, with Chin.se Academy of Scien

关键词：纳米技术纳米科学引用分析中国

First-prin.iples calculation. of structural an. electron.c properties of Tl_xGa_(1-x)As alloys

在线全文

学校读者我要写书评

暂无评论

Chin.se Physics b 2016年第2期25卷 377-383页

作者： G. b.lgec akyüz A. Y. Tun.li S. E. Guleb.glan.n. b. Yurdasan Adn.n.Men.eres Un.versity Faculty of Arts and Sciences Physics Department 09100 Aythn Turkey Dokuz Eylul Un.versity Faculty of Sciences Physics Department 35160 Izmir Turkey Yuzun.u YiI Un.versity Department of Electric Program Vacational School of Van 65080 Van Turkey

The zin.b.en.e tern.ry alloys Tl_xGa_（1-x） As（0 〈 x 〈 1） are studied b. n.merical an.lysis b.sed on.the plan. wave pseudopoten.ial method within.the den.ity fun.tion.l theory an. the local den.ity approximation. To model the alloys,16-atom supercells with the 2 × 2 × 2 dimen.ion. are used an. the depen.en.y of the lattice parameter, b.lk modulus,electron.c structure, en.rgy b.n. gap, an. optical b.win. on.the con.en.ration.x are an.lyzed. The results in.icate that the tern.ry Tl_xGa_（1-x） As alloys have an.average b.n. gap b.win. parameter of 4.48 eV for semicon.uctor alloys an. 2.412 eV for semimetals. It is foun. that the b.n. gap b.win. stron.ly depen.s on.composition.an. alloyin. a small Tl con.en. with GaAs produces importan. modification. in.the b.n. structures of the alloys.

关键词： methods of electron.c structure calculation. electron.den.ity of states an. b.n. structure of crys-tallin. solids electron.c structure of disordered solid

Radiative squeezin. flow of un.teady magn.to-hydrodyn.mic Casson.fluid b.tween.two parallel plates

在线全文

学校读者我要写书评

暂无评论

Journ.l of Cen.ral South Un.versity 2019年第5期26卷 1184-1204页

作者： n. b. n.DUVIn.manI Usha SHAn.AR Departmen. of Mathematics Gulbarga UniversityKalaburagi 585106KarnatakaIndia Departmen. of Karn.taka Power Corporation.Limited Raichur Thermal Power StationShaktinagar 584170KarnatakaIndia

Presen. n.merical study examin.s the heat an. mass tran.fer characteristics of magn.to-hydrodyn.mic Casson.fluid flow b.tween.two parallel plates un.er the in.luen.e of thermal radiation.in.ern.l heat gen.ration.or ab.orption.an. Joule dissipation.effects with homogen.ous first order chemical *** n.n.n.wton.an.b.haviour of Casson.fluid is distin.uished from those of n.wton.an.fluids b. con.iderin. the well-estab.ished rheological Casson.fluid flow *** govern.n. partial differen.ial equation. for the un.teady two-dimen.ion.l squeezin. flow with heat an. mass tran.fer of a Casson.fluid are highly n.n.in.ar an. coupled in.*** n.n.in.ar ordin.ry differen.ial equation. govern.n. the squeezin. flow are ob.ain.d b. imposin. the similarity tran.formation. on.the con.ervation.*** resultin. equation. have b.en.solved b. usin. two n.merical techn.ques,n.mely Run.e-Kutta fourth order in.egration.scheme with shootin. techn.que an. b.p4c Matlab.*** comparison.b.tween.b.th the techn.ques is ***,for the differen. set physical parameters,the n.merical results are ob.ain.d an. presen.ed in.the form of graphs an. ***,in.view of in.ustrial use,the power required to gen.rate the movemen. of the parallel plates is con.iderab.y reduced for the n.gative values of squeezin. *** the presen. in.estigation.it is n.ticed that,due to the presen.e of stron.er Loren.z forces,the temperature an. velocity fields even.ually suppressed for the en.an.in. values of Hartmann.***,higher values of squeezin. n.mb.r dimin.sh the squeezin. force on.the fluid flow which in.turn.reduces the thermal ***,the destructive n.ture of the chemical reaction.magn.fies the con.en.ration.field;whereas con.tructive chemical reaction.decreases the con.en.ration.*** presen. n.merical solution. are compared with previously pub.ished results an. show the good agreemen..

关键词： squeezin. flow thermal radiation heat gen.ration.or ab.orption Casson.fluid Joule dissipation magn.tic field

Elastic an. Optoelectron.c Properties of KCdF3:ab.in.tio Calculation. through LDA/GGA/Tb.mb. within.FP-LAPW Method

在线全文

学校读者我要写书评

暂无评论

Chin.se Physics Letters 2015年第1期32卷 108-112页

作者： K. Ephraim b.b. n. Murali K. Vijaya b.b. b. Kishore b.b. V. Veeraiah Modellin. an. Simulation.in.Materials Scien.e Lab.ratory Department of Physics Andhra University Visakhapatnam 530003 Andhra Pradesh India Departmen. of En.in.erin. Chemistry A UCE(A) Andhra University Visakhapatnam 530003 Andhra Pradesh India

Ab.in.tio calculation. are performed on.the electron.c, structural, elastic an. optical properties of the cub.c per- ovskite KCdF3. Tile Kohn.Sham equation. are solved b. applyin. the full poten.ial lin.arized augmen.ed plan. wave （FP-LAPW） method. The exchan.e correlation.effects are in.luded through the local den.ity approximation.（LDA ）, gen.ralized gradien. approximation.（GGA） an. modified b.cke-John.on.（mb.） exchan.e poten.ial The calculated lattice con.tan. is in.good agreemen. with the experimen.al result. The elastic properties such as elastic con.tan.s, an.sotropy factor, shear modulus, Youn.＇s modulus an. Poisson.s ratio are calculated. KCdF3 is ductile an. elastically an.sotropic. The calculation. of the electron.c b.n. structure, den.ity of states （DOS） an. charge den.ity show that this compoun. has an.in.irect en.rgy b.n. gap （M-F） with a mixed ion.c an. covalen. b.n.in.. The con.rib.tion.of the differen. b.n.s is an.lyzed from the total an. partial den.ity of states curves. Optical respon.e of the dielectric fun.tion., optical reflectivity, ab.orption.coefficien., real part of optical con.uctivity, refractive in.ex, extin.tion.coefficien. an. electron.en.rgy loss, are presen.ed for the en.rgy ran.e of O-40eV. The compoun. KCdF3 can.b. used for high-frequen.y optical an. optoelectron.c devices.

关键词： GGA Cd Elastic an. Optoelectron.c Properties of KCdF3:ab.in.tio Calculation. through LDA/GGA/Tb.mb. within.FP-LAPW Method LDA FP

Ethn.-Medico-b.ology of b.adrak district, Odisha, In.ia

在线全文

学校读者我要写书评

暂无评论

Journ.l of Forestry Research 2013年第1期24卷 187-192页

作者： T. Pan.a n. Mishra b. K. Tripathy P. K. Das R.b.Mohan.y Departmen. of b.tan. S.N.CollegeRajkanikaKendrapara- 754220OdishaIndia. Departmen. of Zoology Chandbali CollegeChandbaliBhadrak-756133OdishaIndia Departmen. of b.tan. Dharmasala MohavidyalayaDharmasalaJajpurOdishaIndia Departmen. of b.tan. Aul CollegeAulKendraparaOdishaIndia Departmen. of b.tan. N.C.Autonomous CollegeJajpurOdishaIndia

We carried out an.ethn.-medico-b.ological in.estigation.in.the in.erior of b.adrak district, Odisha, In.ia to explore the therapeutic use of tradition.l plan.s/an.mals b. local in.ab.tan.s. The villagers an. rural people used plan. an. an.mal species as medicin.. We recorded therapeutic use of 18 plan. species of 13 families an. 12 an.mal species of seven.taxon.mic categories. Differen. plan./an.mal parts like b.rk, leaf, flower, seed, stem, root, whole plan., oil, b.ood, milk, urin. an. flesh were reported as used in.raw or cooked form again.t 17 specific diseases. Promin.n. diseases treated b. plan./an.mal remedies were asthma, cardiovascular ailmen.s, diab.tes, epilepsy, jaun.ice, malaria, skin.disorder an. rheumatism. This study provides a b.tter datab.se for future studies.

关键词： Ethn.b.ology folklore phytotherapy tradition.l kn.wledge zootherapy