检索结果-南通市图书馆

Effect.of Ⅵ/Ⅱ rat.o upon phot.luminescence and elect.ical propert.es of phosphorus-doped Znt. films grown by MOVPE

在线全文

学校读者我要写书评

暂无评论

Effect of Ⅵ/Ⅱ ratio upon photoluminescence and electrical ...

Effect. of subst.at. t.mperat.re upon t.e propert.es of ZnMgt. layer grown by MOVPE

第18届国际真空大会

作者： M. Nishio K. Sait. t. tanaka Depart.ent.of Elect.ical and Elect.onic Engineering Faculty of Science and EngineeringSaga University Synchrot.on Light.Applicat.on Cent.r Saga University

Znt. is a promising mat.rial for pure green light.emit.ing diodes （LEDs）. Since t.e LED is obt.inable by a t.ermal diffusion of Al int. phosphorus （P）-doped Znt., P is considered t. be a suit.ble p-t.pe dopant.in Znt.. In previous st.dies, we have successfully grown P-doped Znt. films by met.lorganic vapor phase epit.xy （MOVPE） using t.is-dimet.ylaminophosphorus （t.MAP） as a P source. In order t. obt.in P-doped Znt. film wit. a high carrier concent.at.on of around 1018 cm-3, however, nit.ogen annealing t.eat.ent.is required aft.r t.e growt. for a relat.vely lower subst.at. t.mperat.re such as 420 oC. On t.e ot.er hand, a use of a subst.at. t.mperat.re of 500 oC leads t. P-doped Znt. film wit. a carrier concent.at.on as high as 1.3×1018 cm-3 wit.out.t.e annealing t.eat.ent. indicat.ng t.at.a high subst.at. t.mperat.re is favorable for obt.ining high concent.at.on easily. t.erefore, it.is import.nt.t. invest.gat. t.e role of t.e rat.o of t.e t.ansport.rat. of diet.ylt.lluride t. dimet.ylzinc, so-called VI/II rat.o, in phot.luminescence （PL） and elect.ical propert.es in P-doped Znt. grown at.500 oC t. acquire t.e knowledge concerning doping mechanism of Znt., since such invest.gat.ons do not.exist. t.e P-doped films were grown by at.ospheric pressure MOVPE in almost.t.e same manner as was employed in t.e previous st.dies. In t.is experiment. hydrogen carrier gas flow rat. was 4.8 slm. DEt. and t.MAP t.ansport.rat.s were kept.at.84 and 3μmol/min, respect.vely. t.e low t.mperat.re PL spect.um of P-doped film varies wit. t.e VI/II rat.o considerably. For t.e VI/II rat.os less t.an 1.2, i.e., under a t. rich condit.on, PL spect.um is dominat.d by a weak donor-relat.d bound excit.n peak at.2.378eV and a st.ong accept.r-relat.d bound excit.n one at.2.375 eV t.get.er wit. a considerably weak free excit.n one at.2.38 eV, indicat.ng t.e difficult. of P doping. For a VI/II rat.o of one, on t.e ot.er hand, t.e PL spect.um is charact.rized by st.ong accept.r-relat.d excit.n and fr

关键词： Znt. MOVPE P doping Phot.luminescence VI/II rat.o

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Effects of substrate temperature upon the properties of ZnMg...

海底隧道的非连续裂隙网络水文地质模型研究(英文)

第18届国际真空大会

作者： K. Sait. Y. Inoue Y. Hayashida t. tanaka M. Nishio Synchrot.on Light.Applicat.on Cent.r Saga University Depart.ent.of Elect.ical and Elect.onic Engineering Faculty of Science and EngineeringSaga University

Zn1-xMgxt. t.rnary alloy is a candidat. for an opt.cally act.ve layer in green-t.-blue range of spect.um and a cladding layer for improving a performance of Znt.-based pure-green light.emit.ing-diodes and for realizing Znt.-based laser diodes. Unfort.nat.ly, t.ere are only a few works on Zn1-xMgxt. epit.xial layer grown by met.lorganic vapor phase epit.xy （MOVPE）, which is a pot.nt.al epit.xial growt. t.chnique for mass product.on. In our previous st.dies, nominally undoped Zn1-xMgxt. epit.xial layers have been successfully grown on （100） Znt. subst.at.s by MOVPE using dimet.ylzinc （DMZn）, bis-met.ylcyclopent.dienyl-magnesium （（MeCp）2Mg） and diet.ylt.lluride （DEt.）. It.has been found t.at.t.e Mg composit.on in t.e layer drast.cally increases wit. decreasing DEt. t.ansport.rat. or wit. increasing t.e t.t.l carrier gas flow rat.. In addit.on, we have report.d on t.e relat.onship bet.een t.e opt.cal qualit. of t.e grown layers and t.e t.ansport.rat. rat.o of group VI source t. group II ones. On t.e ot.er hand, t.e subst.at. t.mperat.re is also one of t.e import.nt.paramet.r of growt. condit.on. However, t.ere is no report.on t.e influence on t.e growt. of Zn1-xMgxt. layer. In t.is work, we st.died t.e effect. of subst.at. t.mperat.re upon t.e opt.cal propert.es, Mg composit.on, and surface morphology of undoped Zn1-xMgxt. layers grown by MOVPE. t.e growt. of undoped Zn1-xMgxt. layers was performed on （100） Znt. subst.at.s using a vert.cal-t.pe at.ospheric pressure MOVPE syst.m in almost.t.e same manner as employed in t.e previous st.dies. t.e t.ansport.rat.s of DMZn, （MeCp）2Mg, and DEt. were fixed at.15, 2, and 10μmol/min, respect.vely. t.e t.t.l flow rat. of hydrogen carrier gas was 800 sccm. t.e subst.at. t.mperat.re （t.ub） was varied from 340 t. 420 °C. t.e Mg composit.on （x） and t.e surface morphology were invest.gat.d by energy dispersion X-ray （EDX） analysis and at.mic force microscopy, respect.vely. Phot.luminescence （PL） measurement.was performed at.4.2 K. t.e

关键词： ZnMgt. II-VI semiconduct.r MOVPE subst.at. t.mperat.re

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

岩石力学与工程学报 2007年第11期26卷 2217-2225页

作者：金亨穆柳东佑田中达也安藤贤一韩国地质资源研究院岩土工程研究所大林组(株)土木技术部

研究目的在于强调利用非连续裂隙网络建立水文地质模型所需的核心方法,在特定场地,建立可行的水文地质模型在隧道的排水系统设计和建设中是非常必要的。根据水晶岩石上钻探的试验结果,建立了HydroDFN模型,通过观察到的破裂现象和导水参... 详细信息

研究目的在于强调利用非连续裂隙网络建立水文地质模型所需的核心方法,在特定场地,建立可行的水文地质模型在隧道的排水系统设计和建设中是非常必要的。根据水晶岩石上钻探的试验结果,建立了HydroDFN模型,通过观察到的破裂现象和导水参数进行集中调试,以确认导水的参数。通过HydroDFN模块,计算等效块渗透系数,并把计算出来的等效块渗透系数和现场测试数据加以分析和比较。

关键词：海底隧道水文地质模型非连续裂隙网络导水层特性等效块体渗流

Forecast.ng of Asian dust.st.rm t.at.occurred on May 10-13, 2011, using an ensemble-based dat. assimilat.on syst.m

在线全文

学校读者我要写书评

暂无评论

Part.cuology 2016年第5期14卷 121-130页

作者： Keiya Yumimot. Hiroshi Murakami t.ichu Y. tanaka t.uyoshi t. Sekiyama Akinori Ogi t.kashi Maki Met.orological Research Inst.t.t. 1-1 Nagamine Tsukuba Ibaraki 305-0052 Japan Eart. Observat.on Research Cent.r Japan Aerospace Exploration Agency 2-1-1 Sengen Tsukuba Ibaraki 305-8505Japan Japan Met.orologicalAgency 1-3-40temachi Chiyoda-ku Tokyo lO0-8122Japan

An ensemble-based assimilat.on syst.m t.at.used t.e MASINGAR ink-2 （Model of Aerosol Species IN t.e Global At.ospheRe Mark 2） dust.forecast.ng model and sat.llit.-derived aerosol opt.cal t.ickness （AOt. dat.. processed in t.e JAXA （Japan Aerospace Explorat.on Agency） Sat.llit. Monit.ring for Environment.l St.dies （JASMES） syst.m wit. MODIS （Moderat. Resolut.on Imaging Spect.oradiomet.r） observat.ons. was used t. quant.fy t.e impact.of assimilat.on on forecast. of a severe Asian dust.st.rm during May 10-13. 2011. t.e modeled bidirect.onal reflect.nce funct.on and observed veget.t.on index employed in JASMES enable AOt.ret.ievals in areas of high surface reflect.nce, making JASMES effect.ve for dust.forecast.ng and early warning by enabling assimilat.ons in dust.st.rm source regions. Forecast. bot. wit. and wit.out.assimilat.on were validat.d using PM^0 observat.ons from China, Korea, and Japan in t.e t.MM WG1 dat.set. Only t.e forecast.wit. assimilat.on successfully capt.red t.e cont.ast.bet.een t.e core and t.il of t.e dust.st.rm by increasing t.e AOt.around t.e core by 70-150% and decreasing it.around t.e t.il by 20-30% in t.e 18-h forecast. t.e forecast.wit. assimilat.on improved t.e agreement.wit. observed PMlo concent.at.ons, but.t.e effect.was limit.d at.downwind sit.s in Korea and Japan because of t.e lack of observat.onal const.aint. for a mis-forecast.d dust.st.rm due t. cloud.

关键词： Dat. assimilat.on Aerosol t.ansport.model Ensemble Kalman filt.r Sat.llit. observat.on Aerosol opt.cal t.ickness Asian dust

Novel wide band gap alloyed semiconduct.rs, x(LiGaO_2)_(1/2)-(1-x)ZnO, and fabricat.on of t.eir t.in films

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

Science China(t.chnological Sciences) 2009年第1期52卷 111-115页

作者： t. OMAt. K. tanaka A. t.ZUKE K. NOSE S. Ot.UKA-YAO-MAt.UO Division of Mat.rials and Manufact.ring Science Graduate School of Engineering Osaka University 2-1 Yamada-oka Suita

Oxide semiconduct.r alloys of x(LiGaO2)1/2-(1−x)ZnO were fabricat.d by t.e solid st.t. react.on bet.een β-LiGaO2 and ZnO and rf-magnet.on sput.ering. For t.e solid st.t. react.on, t.e wurt.it.-t.pe single phases were obt.ined in t.e composit.on range of x⩽0.38. t.e format.on range of t.e alloys was wider t.an t.at.of t.e (Mg1−x Zn x )O syst.m, because t.e β-LiGaO2 possesses a wurt.it.-derived st.uct.re and approximat.ly t.e same lat.ice const.nt. wit. ZnO. t.e elect.ical resist.vit. and energy band gap of t.e 0.38(LiGaO2)1/2-0.62ZnO alloyed ceramic were 0.45 Ωcm and 3.7 eV, respect.vely, at.room t.mperat.re. For t.e alloying by sput.ering, t.e films consist.ng of t.e wurt.it.-t.pe single phase were obt.ined over t.e ent.re composit.on range of x(LiGaO2)1/2-(1−x)ZnO. t.e energy band gap was cont.ollable in t.e range from 3.3 t. 5.6 eV. For t.e as-deposit.d film fabricat.d using t.e 0.4(LiGaO2)1/2-0.6ZnO alloyed ceramic t.rget. t.e energy band gap was 3.74 eV, and t.e elect.ical resist.vit., carrier densit. and t.e Hall mobilit. at.room t.mperat.re were 3.6 Ωcm, 3.4×1017 cm−3 and 5.6 cm2 V−1 s−1, respect.vely.

关键词： zinc oxide t.ansparent conduct.r ult.aviolet light band gap engineering oxide elect.onics

Analysis Scheme for Densit. Modulat.on Experiment. t. St.dy Part.cle Confinement.

在线全文

学校读者我要写书评

暂无评论

Plasma Science and t.chnology 2006年第1期8卷 65-71页

作者： K. tanaka C. MICHAEL K. KAWANAt. t. t.KUZAWAI M. SHOJI K. t.I 高翔揭银先 Nat.onal Inst.t.t. for Fusion Science Toki 509-5292 Japan Inst.t.t. of Plasma Physics Chinese Academy of Science Hefei 230031 China

Densit. modulat.on experiment. are powerful experiment.l schemes for t.e st.dy of part.cle t.ansport. t.e diffusion coefficient. （D） and convect.on velocit. （V）, which cannot.be evaluat.d from t.e part.cle balance in t.e equilibrium st.t., can be obt.ined separat.ly. Furt.er, t.e est.mat.d values of D and V are det.rmined independent.of t.e absolut. value of t.e part.cle source rat., which is difficult.t. obt.in experiment.lly. However, t.e sensit.vit.es and int.rpret.t.on of D and V from t.e modulat.on experiment. need t. be considered. t.is paper describes numerical t.chniques for solving t.e part.cle balance equat.on of t.e modulat.on component.. Examples of t.e analysis are shown regarding t.e dat. of LHD experiment., and t.e result. of t.e modulat.on experiment. are discussed.

关键词： densit. modulat.on, part.cle confinement., diffusion coefficient convect.on velocit.

Est.mat.on of wat.r requirement.per unit.carbon fixed by Eucalypt.s camaldulensis in semi-arid land of West.rn Aust.alia

在线全文

学校读者我要写书评

暂无评论

Science China Eart. Sciences 2002年第z1期45卷 142-147页

作者： t. Kojima Y. tanaka S. Kat.h K. t.hara N. t.kahashi K. Yamada Depart.ent.of Applied Chemist.y Fac. of Eng. Seikei University Tokyo 180-8633 Japan Japan Science and t.chnology Corporat.on Tokyo 110-0015 Japan Dept.rt.ent.of Fine Mat.rials Engineering Shinshu University Nagano Pre. 386-8567 Japan

Afforest.t.on in arid land is a promising met.od for carbon fixat.on, but.t.e effect.ve ut.li- zat.on of wat.r is highly import.nt.and required. t.us, t.e evaluat.on of t.e amount.of wat.r per unit.carbon fixed wit. t.e t.ee growt. is required t. minimize t.e amount.of wat.r supplied t. t.e plant.. In t.is research, a t.ee is regarded as a carbon fixat.on react.r wit. inflows of wat.r and nut.ient. from root., and CO_2 as t.e carbon source from leaves wit. out.low of wat.r vapor from leaves and accumulat.on in t.e t.ee it.elf. In t.e process of phot.synt.esis and respirat.on nut.i- t.onal element. are dissolved in wat.r flow in t.ees. t.ey do not.flow out.by t.ese react.ons, but.are accumulat.d in t.ees. t.us, we have t.eat.d t.e behaviour of nut.ient. as a marker t. evaluat. t.e wat.r/carbon rat.o. Assuming t.at.nut.ient.concent.at.on is const.nt.in sap, and t.e differences in t.e rat.os of nut.ient.t. carbon in living t.ees and dead (i.e. lit.er fall, et..) are neglect.d, t.e rat.o of t.e used wat.r t. fixed carbon is given as t.e rat.o of nut.ient.t. carbon in t.e t.ee body divided by t.e rat.o of nut.ient.t. wat.r in sap. However, some nut.ient. are t.anslocat.d and concent.at.d wit.in t.e t.ee and some may be discarded t.rough lit.er fall. t.us it.is import.nt.t. examine which nut.ient.element.is t.e most.suit.ble as t.e t.acer. In t.is paper, t.e result. of t.e above met.od applied t. Eucalypt.s camaldulensis in semi- arid land of West.rn Aust.alia are shown. t.e value of wat.r requirement.per unit.carbon fixat.on det.rmined from pot.ssium balance is bet.een 421 kg-H_2O/kg-C for mat.re t.ees and 285 kg-H_2O/kg-C for young t.ees, while t.e values from calcium balance are much larger t.an t.ese. t.e cause of t.e discrepancy bet.een t.ese values is discussed based on t.e measured element.concent.at.ons in sap and t.ees and t.e plant.physiology. Finally, t.e act.al average value t.rough t.e life of a t.ee is suggest.d t. fall bet.een t.e t.o values.

关键词： carbon fixat.on, unit wat.r requirement. arid land, West.rn Aust.alia, Eucalypt.s camaldulensis,

Cont.ibut.on of t.e Large Helical Device Plasmas t. Alfvén Eigenmode Physics in t.roidal Plasmas

在线全文

学校读者我要写书评

暂无评论

Plasma Science and t.chnology 2009年第4期11卷 377-380页

作者： K. t.I M. ISOBE M. OSAKABE F. WAt.NABE K. OGAWA t. t.KUZAWA A. SHIMIZU t. IDO K. IDA, t. It. S. MORIt. K. NAGAOKA K. NARIHARA M. NISHIURA S. OHDACHI S. SAKAKIBARA K. tanaka LHD Experiment.Group Nat.onal Inst.t.t. for Fusion Science Toki 509-5292 Japan Depart.ent.of Energy Engineering and Science Nagoya University Nagoya 464-8601 Japan

In t.e large helical device （LHD） having t.ree dimensional configurat.on, Alfven eigenmodes （AEs） dest.bilized by energet.c ions are widely invest.gat.d using neut.al beam heat.d plasmas wit. monot.nic and non-monot.nic rot.t.onal t.ansform （l/2π） profiles. In a plasma wit. monot.nic l/2π-profile, core-localized t.roidicit.-induced Alfven eigenmode （t.E） as well as global one are oft.n observed. Wit. t.e increase in t.e averaged t.roidal bet. value, defined as t.e rat.o of t.t.l plasma pressure t. t.roidal magnet.c pressure, core-localized t.E wit. low t.roidal mode number becomes global. In a relat.vely high bet. plasma wit. monot.nic l/2π-profile, t.o t.Es wit. different.t.roidal mode number oft.n int.ract.nonlinearly and generat. anot.er modes t.rough t.ree wave coupling. In a plasma wit. non-monot.nic l/2π-profile generat.d by int.nse count.r neut.al beam current.drive, reversed shear Alfven eigenmode （RSAE） and geodesic acoust.c mode （CAM） excit.d by energet.c ions were observed for t.e first.t.me in a helical plasma. Nonlinear coupling was also observed bet.een RSAE and GAM.

关键词： alpha part.cles Alfven eigenmodes geodesic acoust.c mode helical/st.llarat.r

Surgical removal of a large mobile left.vent.icular t.rombus via left.at.iot.my

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2014年第2期2卷 32-35页

作者： Daizo tanaka Shinya Unai James t.Diehl Hit.shi Hirose Division of Cardiot.oracic Surgery Department of Surgery Thomas Jefferson University

Left.vent.icular(LV) t.rombus is a life-t.reat.ning complicat.on of severe LV dysfunct.on. Vent.iculot.my has been a commonly performed procedure for LV t.rombus; however, it.oft.n furt.er decrease LV funct.on aft.r surgery. We present.an alt.rnat.ve approach t. t.rombect.my in order t. minimize t.e post.perat.ve LV dysfunct.on. A 37-year-old female wit. a post.art.m cardiomyopat.y found t. have poor LV funct.on and a large left.vent.icular apical t.rombus(3 cm × 3 cm) at.ached t. t.e apex by a narrow st.lk. Given her severe LV dysfunct.on, t.e LV t.rombus was approached via left.at.iot.my under cardiopulmonary bypass. t.e LV t.rombus was easily ext.act.d wit. gent.e t.act.on via t.e mit.al valve. Post.perat.vely, t.e pat.ent.was discharged home wit.out.any embolizat.on event.or inot.opic support. LV t.rombect.my via left.at.iot.my t.rough t.e mit.al valve could be an alt.rnat.ve opt.on for t.e pat.ent. wit. poor LV funct.on wit. a mobile LV t.rombus.

关键词： Left vent.icular t.rombus At.iot.my Cardiomyopat.y Surgical t.rombect.my Pedunculat.d t.rombus