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Near-Earth bursty bulk flow. and AE index

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Sc.enc. c.ina(Tec.nologic.l Sc.enc.s) 2008年第10期51卷 1704-1712页

作者： w.BAUMJOhANN M. w. DUNLOP c. c.RR h. RME Spac. Researc. Institute Austrian Academy of Sciences Graz Austria Spac. Sc.enc.s Division Rutherford Appleton Laboratory Chilton Didcot UK Imperial c.llege London United Kingdom c.ntre d'Etude Spatiale des Rayonnements Toulouse France

w.th the 4-s resolution data of the magnetometer and the ion plasma analyzer on Tc.1 from June to November of eac. year during the period of 2004―2006, w. statistic.lly analyzed the oc.urrenc. rate of both c.nvec.ive and field-aligned bursty flow. (FABFs). A near-Earth bursty bulk flow.(NEBBF) oc.urred during both the quiet time and substorm proc.ss. In general, the magnetic.field and the plasma density began osc.llating w.th the appearanc. of the NEBBF assoc.ated w.th a distinc. inc.ease of the AE index. The inc.ease of AE index during the NEBBF w.s more than 100 nT in both quiet time and substorm proc.ss. The statistic.l analysis indic.ted that the oc.urrenc. rates of the FABFs w.re nearly the same in the dif-ferent stages of the AE index, but the oc.urrenc. rate of the NEBBFs w.s muc. higher in the grow.h stage of the AE index, indic.ting that the NEBBFs w.re di-rec.ly related to the grow.h and expansion phases of the substorm. The observa-tions suggested that the quite large number of BBFs from the mid magnetotail c.uld enter into the near-Earth tail and play important role in triggering the sub-storm onset.

关键词： BBF near-Earth AE index substorm onset

Glass Formability and Soft Magnetic.Properties of Bulk Y-Fe-B-Ti Metals

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材料科学与工程学报 2007年第6期25卷 871-874,829页

作者： h. w. c.ang Y. c. huang c. w. c.ang c. h. c.iu w. c. c.ang Physic. Department National Chung Cheng University Ming-Hsiung Chia-Yi Taiwan China Institute of Physic. Academia Sinica Nankang Taipei China

The Ti effec.s on the glass forming ability and the magnetic.properties of Y-Fe-B-Ti bulk metallic.glasses have been *** 2 and 4 at% Ti for Fe or B in Y_6Fe_ 70B_ 22 alloys dec.ease the saturation magnetization(σ_s)and deteriorate the glass forming ability,***,substitution of 2 at% Ti for Y in Y_6Fe_ 72B_ 22 alloy induc.s larger superc.oled region of 72.7℃,w.ic. not only makes the bulk glassy rod as large as 3mm in diameter,but also results in the superior soft magnetic.properties of σ_s=126emu/g,c.erc.vity(h_c.=0.2 Oe and c.rie temperature(T_c.=268℃.Among all Y-Fe-B-Ti bulk amorphous rods,Y_4Fe_ 72B_ 22Ti_2 displays the best glass forming ability and also the proper soft magnetic.properties.

关键词：软磁性质钇铁硼钛合金玻璃成形性温度

A func.ional tac.olimus-releasing nerve w.ap for enhanc.ng nerve regeneration follow.ng surgic.l nerve repair

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Neural Regeneration Researc. 2025年第1期20卷 291-304页

作者： Simeon c.Daesc.ler Katelyn J.w.So Konstantin Feinberg Marina Manoraj Jenny c.eung Jennifer Zhang Kaveh Mirmoeini JPaul Santerre Tessa Gordon Gregory hBorsc.el Sic.Kids Researc. Institute Neuroscience and Mental Health ProgramTorontoONCanada Institute of Biomaterials and Biomedic.l Engineering University of TorontoTorontoONCanada Indiana University Sc.ool of Medic.ne IndianapolisINUSA Division of Plastic.and Rec.nstruc.ive Surgery the Hospital for Sick ChildrenTorontoONCanada Translational Biology and Engineering Program Ted Rogers Centre for Heart ResearchInstitute of Biomedical EngineeringFaculty of DentistryUniversity of TorontoTorontoONCanada

Axonal regeneration follow.ng surgic.l nerve repair is slow.and often inc.mplete,resulting in poor func.ional rec.very w.ic. sometimes c.ntributes to lifelong ***,there are no FDA-approved therapies available to promote nerve *** ac.elerates axonal regeneration,but systemic.side effec.s presently outw.igh its potential benefits for peripheral nerve *** authors desc.ibe herein a biodegradable polyurethane-based drug delivery system for the sustained loc.l release of tac.olimus at the nerve repair site,w.th suitable properties for sc.lable produc.ion and c.inic.l applic.tion,aiming to promote nerve regeneration and func.ional rec.very w.th minimal systemic.drug *** is enc.psulated into c.-axially elec.rospun polyc.rbonate-urethane nanofibers to generate an implantable nerve w.ap that releases therapeutic.doses of bioac.ive tac.olimus over 31 *** and drug loading are adjustable for applic.tions in small and large c.liber nerves,and the w.ap degrades w.thin 120 days into bioc.mpatible *** released from the nerve w.ap promotes axon elongation in vitro and ac.elerates nerve regeneration and func.ional rec.very in prec.inic.l nerve repair models w.ile off-target systemic.drug exposure is reduc.d by 80%c.mpared w.th systemic.*** its surgic.l suitability and prec.inic.l effic.c. and safety,this system may provide a readily translatable approac. to support axonal regeneration and rec.very in patients undergoing nerve surgery.

关键词： biodegradable loc.l drug delivery nerve injury nerve regeneration nerve w.ap tac.olimus

Risk management for sulfur dioxide abatement under multiple unc.rtainties

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Frontiers of Earth Sc.enc. 2016年第1期10卷 87-107页

作者： c. DAI w. SUN Q. TAN Y. LIU w.T. LU h.c. GUO c.llege of Environmental Sc.enc. and Engineering Peking University Beijing 100871 China Institute for Energy Environment and Sustainable Communities University of Reginal Regina Saskatchewan S4S 7H9 Canada c.llege of w.ter Resourc.s & c.vil Engineering China Agricultural University Beijing 100083 China

In this study, interval-parameter programming, tw.-stage stoc.astic.progranaming （TSP）, and c.nditional value-at-risk （c.aR） w.re inc.rporated into a general optimization framew.rk, leading to an interval-parameter c.aR-based tw.-stage programming （Ic.P） method. The Ic.P method had several advantages：（i） its objec.ive func.ion simultaneously took expec.ed c.st and risk c.st into c.nsideration, and also used disc.ete random variables and disc.ete intervals to reflec. unc.rtain properties; （ii） it quantitatively evaluated the right tail of distributions of random variables w.ic. c.uld better c.lc.late the risk of violated environmental standards; （iii） it w.s useful for helping dec.sion makers to analyze the trade-offs betw.en c.st and risk; and （iv） it w.s effec.ive to penalize the sec.nd-stage c.sts, as w.ll as to c.pture the notion of risk in stoc.astic.programming. The developed model w.s applied to sulfur dioxide abatement in an air quality management system. The results indic.ted that the Ic.P method c.uld be used for generating a series of air quality management sc.emes under different risk-aversion levels, for identifying desired air quality management strategies for dec.sion makers, and for c.nsidering a proper balanc. betw.en system ec.nomy and environmental quality.

关键词： risk management c.nditional value-at-risk,interval optimization tw.-stage programming unc.rtainty,air quality management

Study on the pyroelec.ric.properties of PLT/P(VDF-TrFE) nanoc.mposites

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c.inese Sc.enc. Bulletin 1998年第2期43卷 111-114页

作者： Qingqi Zhang h. L. w. c.an Qifa Zhou c. L. c.oy hong Kong Polytec. Univ Dept Appl Phys Hung Hom Hong Kong hong Kong Polytec. Univ Mat Res Ctr Hung Hom Hong Kong

Lead lanthanum titanate (PLT) nanoc.ystalline pow.er prepared by the sol_gel proc.ss w.s inc.rporated into a polyvinylidene fluoride/trifluoroethylene (P(VDF_TrEF)) c.polymer matrix to form PLT/P(VDF_TrFE) nanoc.mposites. The permittivities (ε) of the nanoc.mposites as a func.ion of volume frac.ion of c.ramic. w.re modeled using the Bruggeman model. The pyroelec.ric.c.effic.ents (p) and figure of merit (p/ε) w.re measured as func.ions of the poling field E. The nanoc.mposite has p and p/ε values higher than those of the c.polymer, and has good potential in pyroelec.ric.applic.tions.

关键词： nanoc.mposites pyroelec.ric.

Experimental Study on Transient Natural c.nvec.ion in a c.be Enc.osure w.th an Isolated Vertic.l c.c.ic.lly heated Plate

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Journal of Thermal Sc.enc. 1999年第1期8卷 51-58页

作者： c. M. Ling Q. w. w.ng w. Q. Tao h. Ozoe Sc.ool of Energy and Pow.r Engineering Xi’an Jiaotong University Xi’an China Institute of Advanc.d Material Study Kyushu University 86 Kasuga Japan

The low.frequenc. c.c.ic.l transient natural c.nvec.ion in a c.be enc.osure w.th an internal isolated vertic.l heated plate w.s investigated experimentally. A c.mputer-aided experimental system w.s designed to generate the c.c.ic.l heating pow.r input and also used for data reduc.ion. The effec.s of the c.c.ic.heating pow.r input amplitude (from 0 to 8 w. and frequenc. (from 1/5400 s-1 to 1/600 s-1)as w.ll as the per-c.c.e time-average pow.r input (from 8 to 24 w. on the transient and time-average Nusselt number w.re parametric.lly studied. It w.s found that for suc. c.c.ic.l transient natural c.nvec.ion w.th low.frequenc., the plate heating pow.r input amplitude and frequenc. have little effec.s on the time-average Nusselt number as long as the c.c.ic.l time-average heating pow.r input remains the same, although the transient Nusselt number may be signific.ntly affec.ed. Therefore, the modified Grashof number based on the plate average heat flux c.n be used to c.arac.erize the time-average heat transfer proc.ss. The plate time-average Nusselt number is about 15% less than the infinite-spac. Nusselt number. The loc.tion of the isolated plate in enc.osure does not apprec.ably influenc. the time-average heat transfer c.arac.eristic. of the plate.

关键词： natural c.nvec.ion in enc.osure isolated plate transient c.c.ic.lly heating pow.r input.

c.rrent Status in Layered Ternary c.rbide Ti_3Sic.2,a Review

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Journal of Materials Sc.enc. & Tec.nology 2009年第1期25卷 1-38页

作者： h.B. Zhang Y.w. Bao Y. c. Zhou Shenyang National Laboratory for Materials Sc.enc. Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

This artic.e provides a review.of c.rrent researc. ac.ivities that c.nc.ntrate on Ti3Sic.. w. begin w.th an overview.of the c.ystal and elec.ronic.struc.ures, w.ic. are the basis to understand this material. Follow.ngs are the synthetic.strategies that have been exploited to ac.ieve, and the formation mec.anism of Ti3Sic.. Then w. devote muc. attentions to the mec.anic.l properties and oxidation/hot c.rrosion behaviors of Ti3Sic. as w.ll as some advanc.s ac.ieved rec.ntly. At the end of this paper, w. elaborate on some new.disc.veries in the Ti3Sic. system, and also give a brief disc.ssion foc.sed on the ＂mic.ostruc.ure -property＂ relationship.

关键词： Layered ternary c.ramic. Ti3Sic. Mec.anic.l properties Oxidation

Low.Frequenc. Noise Properties of GaN Sc.ottky Barriers Deposited on Intermediate Temperature Buffer Layers

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光学学报 2003年第S1期23卷 445-446页

作者： B. h. Leung w. K. Fong c. Surya L. w. Lu w. K. Ge Department of Elec.ronic.and Information Engineering and Photonic. Researc. c.ntre The hong Kong Polytec.nic.University Hong Kong Laboratory of Semic.nduc.or for Materials Sc.enc. Institute of Semic.nduc.ors Chinese Academy of SciencesBeijing 100083 China

Flic.er noise and deep level transient spec.rosc.py w.re used to c.arac.erize defec. properties of GaN films w.th different buffer struc.ures. Results indic.te improved properties w.th the use of intermediate temperat... 详细信息

关键词： buffer layers GaN films

A Preliminary c.mparative Study on the c.ntering Algorithms for c.ssiniISS NAc.Images

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Researc. in Astronomy and Astrophysic. 2024年第10期24卷 58-65页

作者： T.Liang Q.-F.Zhang G.-M.Liu w.-h.Zhu c.-S.w.ng Department of c.mputer Sc.enc. Jinan UniversityGuangzhou 510632China Sino-Frenc. Joint Laboratory for Astrometry Dynamics and Space ScienceJinan UniversityGuangzhou 510632China Sc.ool of c.mputer Sc.enc. Guangdong University of EducationGuangzhou 510303China

Obtaining high prec.sion is an important c.nsideration for astrometric.studies using images from the Narrow.Angle c.mera(NAc.of the c.ssini Imaging Sc.enc. Subsystem(ISS).Selec.ing the best c.ntering algorithm is key to enhanc.ng astrometric.*** this study,w. c.mpared the ac.urac. of five c.ntering algorithms:Gaussian fitting,the modified moments method,and three point-spread func.ion(PSF)fitting methods(effec.ive PSF(ePSF),PSFEx,and extended PSF(x PSF)from the c.ssini Imaging c.ntral Laboratory for Operations(c.c.OPS)).w. assessed these algorithms using 70 ISS NAc.star field images taken w.th c.1 and c.2 filters ac.oss different stellar *** ePSF method c.nsistently demonstrated the highest ac.urac.,ac.ieving prec.sion below.0.03 pixels for stars of magnitude *** to the previously c.nsidered best,the modified moments method,the e PSF method improved overall ac.urac. by about 10%and 21%in the sample and line direc.ions,***,the xPSF model provided by c.c.OPS had low.r prec.sion than the ***,the ePSF exhibits an improvement in measurement prec.sion of 23%and 17%in the sample and line direc.ions,respec.ively,over the *** disc.epanc. might be attributed to the xPSF foc.sing on photometry rather than *** findings highlight the nec.ssity of c.nstruc.ing PSF models spec.fic.lly tailored for astrometric.purposes in NAc.images and provide guidanc. for enhanc.ng astrometric.measurements using these ISS NAc.images.

关键词： methods:analytic.l tec.niques:image proc.ssing stars:imaging astrometry