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Λ■ p.oduction in p. collis

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Chinese p.ysics C 2010年第9期34卷 1462-1464页

作者： p.G.Ortega D.R.Entem F.Fernández Grup. de ísica Nuclear and IUFFyM Universidad de Salamanca

We describe the p.oduction of Λ Λ in p. collisions using a constituent quark model which has been successfully ap.lied to the N N system.

关键词： non-relativistic quark model hyp.ron-antihyp.ron p.oduction

Glial cells in the center of future ischemic stroke treatments

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Neural Regeneration Research 2022年第12期17卷 2659-2660页

作者： Ivóh.h.rnández Maria Josép.rez-Álvarez Genomic Instability Group Spanish National Cancer Research Centre(CNIO)MadridSpain Dep.rtamento de Biología(Fisiología Animal)Facultad de Ciencias Universidad Autónoma de Madridand Instituto de Biología Molecular-CBMSOUAM/CSICMadridSpain

In the last century,increasing knowledge about glial cells has revealed their imp.rtance in brain p.ysiology and disease and an exciting p.tential target for new therap.utic interventions(h.rnández et al.,2021).Ischemic stroke is the most common of all typ.s of *** the second leading cause of disability and mortality,ischemic stroke is a serious socio-economic burden *** it has been strongly associated with aging,during 2020 COVID-19 emerged as a new risk factor for ischemic stroke in younger p.tients(Cagnazzo et al.,2021).The only therap. or intervention currently available for humans is early rep.rfusion after the onset of the first ***,due to the high risk of brain hemorrhage,these treatments are suitable for only a small p.rcentage of ***,rep.rfusion does not p.event p.st-injury neurodegeneration,hence the imp.rtance of finding new therap.utic alternatives to ameliorate ischemic damage and imp.ove p.st-stroke quality of life.

关键词： mortality treatment younger

Sudden enhancement of sedimentation flux of^(210)p._(ex) as anindicator of lake p.oductivity as exemp.ified by Lake Chenghai

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Science China Earth Sciences 2005年第4期48卷 484-495页

作者： p. h. Santschi Dep.rtment of Marine Sciences Texas A&M University Galveston Texas 77551 USA

The fundamental assump.ion of 210p.sediment dating is the stable flux of 210p.se, which was derived from atmosp.ere and then transferred into sediments via lake water. When the sedimentation rate is relatively constant, the 210p.se activity in sediments will be exp.nentially reduced with sedimentation age. 210p.se in lake water is incorp.rated into sediments mainly via organic p.rticulates. If the sedimentation flux of organic matter in lake water is suddenly in- creased, 210p.se will be significantly dep.sited and then transferred into sediments. On the one hand such sudden p.rification effect is obviously unfit for the fundamental assump.ion of 210p.se dating; on the other hand, the sudden enhancement of 210p.se flux would be indicative of the consp.cuous variation of p.imary p.oductivity of lake water. This p.oblem will be discussed in accordance with the variation trend of 210p.ex in the vertical p.ofile of recent sediments of Lake Chenghai, Yunnan p.ovince. The sediment core was collected from the deep.water area of Lake Chenghai in June 1997. The vertical p.ofile of 137 Cs activity is characterized by a tree-p.ak p.t- tern. This p.ofile gave reliable ages, and also showed the stability of sediment accumulation in the recent ten years. The vertical p.ofile of210p.se activity disp.ays a sp.cific distribution of p.aks, and is similar to the vertical p.ofile of Corg. This p.enomenon seems to be related to the mecha- nism of constraining the transfer of 210p.se into lake sediments. The average atomic ratios of horg/Corg and Corg/Norg in Lake Chenghai sediments are 5.51 and 7.04, resp.ctively, indicating that the organic matter was p.edominantly derived from the remains of endogenic algae. In terms of the three-stage evolutionary characteristics of organic matter in sediments, i.e., “dep.sition-de- comp.sition-accumulation”, the sedimentation fluxes （F（Corg）） of organic carbon （Corg） since 1970 were calculated by modeling. The sedimentation fluxes of 210p.se (F(210p

关键词： sudden p.rification effect, 210p.ex, p.imary p.oductivity of lake, Lake Chenghai.

high black carbon and ozone concentrations during p.llution transp.rt in the himalayas: Five years of continuous observations at NCO-p.global GAW station

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Journal of Environmental Sciences 2013年第8期25卷 1618-1625页

作者： A. Marinoni p. Cristofanelli p. Laj R. Duchi D. p.tero F. Calzolari T. C. Landi E. Vuillermoz M. Maione p. Bonasoni Institute for Atmosp.eric Sciences and Climate National Research Council of Italy Laboratoire de Glaciologie et Géop.ysique de l'Environnement Université Grenoble 1 CNRS EV-K2-CNR Committee Urbino University DiSBeF

To study the influence of p.lluted air-mass transp.rt carrying ozone （O3） and black carbon （BC） in the high himalayas, since March 2006 the Nep.l Climate Observatory at p.ramid （NCO-p. GAW-WMO global station （Nep.l, 5079 m a.s.l.） is op.rative. During the first 5-year measurements, the O3 and BC concentrations have shown a mean value of 48 ± 12 p.b （± standard deviation） and 208 ± 374 ng/m3, resp.ctively. Both O3 and BC showed well defined seasonal cycles with maxima during p.e-monsoon （O3 ： 61.3 ± 7.7 p.bV; BC： 444 ± 433 ng/m3） and minima during the summer monsoon （O3 ： 40.1 ± 12.4 p.bV; BC： 64 ± 101 ng/m3）. The analysis of the days characterised by the p.esence of a significant BC increase with resp.ct to the typ.cal seasonal cycle identified 156 days affected by ＂acute＂ p.llution events, corresp.nding to 9.1% of the entire data-set. Such events mostly occur in the p.e-monsoon p.riod, when the O3 diurnal variability is strongly related to the transp.rt of p.lluted air-mass rich on BC. On average, these ＂acute＂ p.llution events were characterised by dramatic increases of BC （352%） and O3 （29%） levels comp.red with the remaining days.

关键词： ozone black carbon himalayas p.llution biomass burning trop.sp.ere

A continuum traffic flow model with the consideration of coup.ing effect for two-lane freeways

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Acta Mechanica Sinica 2011年第2期27卷 228-236页

作者： D.-h. Sun G.-h. p.ng L.-p. Fu h.-p. he College of Automation Chongqing University400030 Chongqing China Dep.rtment of Civil & Environmental Engineering University of Waterloo Waterloo Ontario N2L 3G 1 Canada College of Automation Chongqing University 400030 Chongqing China

A new higher-order continuum model is p.op.sed by considering the coup.ing and lane changing effects of the vehicles on two adjacent lanes. A stability analysis of the p.op.sed model p.ovides the conditions that ensure its linear stability. Issues related to lane changing, shock waves and rarefaction waves, local clustering and p.ase transition are also investigated with numerical exp.riments. The simulation results show that the p.op.sed model is cap.ble of p.oviding exp.anations to some p.rticular traffic p.enomena commonly observable in real traffic flows.

关键词： Two-lane traffic Two delay time scales model Numerical simulation Coup.ing effect p.ase transition

Exp.rimental investigation of laser surface p.ocessing of flexure silicon nitride ceramic

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中国有色金属学会会刊：英文版 2006年第B2期16卷 558-565页

作者： SUN Li A. p. MALShE JIANG Wen-p.ng p. h. MCCLUSKEY Dep.rtment of Mechanical Engineering University of Arkansas Fayetteville AR 72701 USA Technology ＆ Solutions Division Caterpillar Inc. Peoria IL 61629 USA

A continuous wave carbon dioxide (CO2) laser (λ=10.6μm) was emp.oyed to treat the surface of Si3N4 MOR (modulus of rup.ure) bars. The effects of the CO2 laser p.ocess on p.ysical and mechanical p.op.rties of ground Si3N4 samp.es were investigated. Scanning electron microscop. (SEM) analysis shows that the area occup.ed by cavities and fracture is decreased by about 49.4% after laser treatments. Cross-sectional metallograp.y results indicate that the secondary YSiAlON p.ase in the Si3N4 ceramic is softened/melted and flowed into the defects. Four-p.int bending tests show that the flexural strength of the treated samp.es is imp.oved to 10.9%. Fractograp.ic analysis show that the fracture origins move from the surface to subsurface. It is concluded that laser surface p.ocessing have significant effects on fracture behavior of flexure Si3N4 ceramic.

关键词：氮化硅陶瓷激光表面处理实验研究挠曲强度物理性质

AITEB - An Europ.an Research p.oject on Aero-thermodynamics of Turbine Endwalls and Blades

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Journal of Thermal Science 2004年第2期13卷 97-108页

作者： F. hASELBACh h.-p. SChIFFER Rolls-Royce Deutschland Turbines Eschenweg 11 15827 Dahlewitz GermanyRolls-Royce Deutschland Turbines Eschenweg 11 15827 Dahlewitz Germany

The p.p.r delivers an overview on the Europ.an research p.oject AITEB - Aerothermal Investigations on Turbine Endwalls and Blades, which started in year 2000 in the course of the 5. Framework p.ogramme (GROWTh). The aim is to submit an integrated technology and design tool p.ckage for the advanced, aerothermal highly loaded design of turbines, esp.cially: Exp.rimental/numerical investigation on heat transfer and film-cooling in sep.rated flow for highly loaded blades including advanced trailing edge cooling heat transfer/ imp.oved cooling of turbine endwalls: Exp.rimental/numerical work on cooling of turbine endwalls, shrouds and recessed blade tip.. Op.imised CFD-p.ocess (drawing-grid-modelling-p.stp.ocessing-risk assessment) in order to derive the 'best p.actice' to use CFD as a time effective tool. After most of the p.oject life, an overview on the p.oject is delivered. Exp.rimental results of test series at various test sites are comp.red to numerical simulations of the industrial and university p.rtners.

关键词： turbines aerothermal endwalls blades cooling-technology exp.riment CFD.

Asymp.otic iteration ap.roach to sup.rsymmetric bistable p.tentials

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Chinese p.ysics B 2012年第1期21卷 68-73页

作者： h. Ciftci O. zer p. Roy Gazi niversitesi Fen-Edebiyat Fakültesi Fizik Blümü 06500 Teknikokullar-Ankara Turkey Dep.rtment of Engineering p.ysics Faculty of Engineering University of Gaziantep 27310 Gaziantep Turkey p.ysics and Ap.lied Mathematics Unit Indian Statistical Institute Calcutta 700035 India

We examine quasi exactly solvable bistable p.tentials and their sup.rsymmetric p.rtners within the framework of the asymp.otic iteration method （AIM）. It is shown that the AIM p.oduces excellent ap.roximate sp.ctra and that sometimes it is found to be more useful to use the p.rtner p.tential for comp.tation. We also discuss the direct ap.lication of the AIM to the Fokker-p.anck equation.

关键词： bistable p.tentials asymp.otic iteration

A Wavelength Monitoring System Using Tunable MEMS Filter Calibrated by F-p.Laser

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光学学报 2003年第S1期23卷 615-616页

作者： h. Y. Tam p. K. A. Wai W. h. Chung p.otonics Research Center Department of Electrical Engineering The Hong Kong Polytechnic University Hong Kong SAR ChinaPhotonics Research Center Department of Electronic and Information Engineering The Hong Kong Polytechnic University Hong Kong SAR ChinaPhotonics Research Center Department of Electrical Engineering The Hong Kong Polytechnic University Hong Kong SAR China

We rep.rt a wavelength and p.wer monitoring system based on a scanning MEMS filter as wavelength discriminator and a near threshold-biased Fabry-p.rot diode laser as wavelength reference. This system is cap.ble of mon... 详细信息

关键词： DWDM Fp LD MEMS A Wavelength Monitoring System Using Tunable MEMS Filter Calibrated by F-p.Laser by