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NUMERICAL EXPERIMENTs ON THE sEAsONAL TRANsITION OF GENERAL CIRCULATION OVER AsIA--PART Ⅱ

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Advances in Atmospheric sciences 1984年第2期1卷 188-198页

作者：纪立人 s.Tibaldi Academia sinica Beijing Furopean Centre for Medium Range Weather Forecasts Institute of Atmospheric Physics Reading England

In part Ⅱ of this paper, the effeets of diabatic heating and the Tibetan Plateau on the seasonal transition of the general circulation over Asia is investigated. It is shown that the effect of differential heating mainly due to land-sea contrast dominates even fora medium time scale. The effect of the Plateau seems to reinforce but not radically change the basic features of the events.

关键词： over PART NUMERICAL EXPERIMENTs ON THE sEAsONAL TRANsITION OF GENERAL CIRCULATION OVER AsIA

Triangle singularity enhancing isospin violation in B^0_s→ J/ψπ~0f_0(980)

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Chinese Physics C 2018年第4期42卷 157-165页

作者： Wei-Hong Liang s. sakai Ju-Jun Xie E. Oset Department of Physics Guangxi Normal University Guilin 541004 China Departamento de Física Teórica and IFIC Centro Mixto Universidad de Valencia-CSIC Institutos de Investigación de Paterna Aptdo. 22085 46071 Valencia Spain Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 China

We perform calculations for the Bs0→ J/ψπ0f0（980） and Bs0 → J/ψπ0a0（980） reactions, showing that the first is isospin-suppressed while the second is isospin-allowed. The reaction proceeds via a triangle mechanism, with Bs0 →J/ψK＊ K ＋c.c., followed by the decay K＊ →Kπ and a further fusion of KK into the f0（980） or a0（980）. We show that the mechanism develops a singularity around the π0 f0（980） or π0a0（980） invariant mass of 1420 MeV, where the π0f0 and π0a0 decay modes are magnified and also the ratio of π0f0 to π0a0 production. Using experimental information for the Bs0 → J/ψK＊K ＋c.c. decay, we are able to obtain absolute values for the reactions studied which fall into the experimentally accessible range. The reactions proposed and the observables evaluated, when contrasted with actual experiments, should be very valuable to obtain information on the nature of the low lying scalar mesons.

关键词： triangle singularity light scalar meson isospin violation bottom meson decay

Tree growth is more limited by drought in rear-edge forests most of the times

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Forest Ecosystems 2021年第2期8卷 330-344页

作者： J.Julio Camarero Antonio Gazol Gabriel sangüesa-Barreda Marta Vergarechea Raquel Alfaro-sánchez Nicolás Cattaneo sergio M.Vicente-serrano Instituto Pirenaico de Ecología(IPE-CsIC) Avda.Montañana 1005E-50192 ZaragozaSpain Ei FAB-iu FOR University of ValladolidCampus Duques de SoriaE-42004 SoriaSpain NIBIO Norwegian Institute of Bioeconomy ResearchPostboks 155NO-1431ÅsNorway Department of Biology Wilfrid Laurier UniversityN2L 3C575 Univ.Avenue WWaterlooOntarioCanada

Background:Equatorward,rear-edge tree populations are natural monitors to estimate species vulnerability to climate *** to biogeographical theory,exposition to drought events increases with increasing aridity towards the equator and the growth of southern tree populations will be more vulnerable to drought than in central ***,the ecological and biogeographical margins can mismatch due to the impact of ecological factors(topography,soils)or tree-species acclimation that can blur large-scale geographical imprints in trees responses to drought making northern populations more drought ***:We tested these ideas in six tree species,three angiosperms(Fagus sylvatica,Quercus robur,Quercus petraea)and three gymnosperms(Abies alba,Pinus sylvestris and Pinus uncinata)by comparing rear-edge tree populations subjected to different degrees of *** used dendrochronology to compare the radial-growth patterns of these species in northern,intermediate,and southern tree populations at the continental rear *** and conclusions:We found marked variations in growth variability between species with coherent patterns of stronger drought signals in the tree-ring series of the southern populations of ***,***,and *** was also observed in species from cool-wet sites(*** and ***),despite their limited responsiveness to ***,in the case of *** the intermediate population showed the strongest relationship to *** drought-sensitive species as *** and ***,southern populations presented more variable growth which was enhanced by cool-wet conditions from late spring to *** found a trend of enhanced vulnerability to drought in these two *** response of tree growth to drought has a marked biogeographical component characterized by increased drought sensitivity in southern populations even within the species distribution rear ***,the relationship

关键词： Climate change Dendroecology Latitudinal gradient Mediterranean forests standardized evapotranspiration precipitation index(sPEI)

Potentials of GaP as millimeter wave IMPATT diode with reference to si,GaAs and GaN

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红外与毫米波学报 2019年第4期38卷 395-402页

作者： Janmejaya Pradhan s K swain s R Pattnaik G N Dash College of Engineering Bhubaneswar Bhubaneswar Odisha 752024 India National Institute of science and Technology Berhampur Odisha 761008 India school of Physics Sambalpur University Sambalpur Odisha 768019 India

This paper presents the simulation results of DC,small-signal and noise properties of GaP based Double Drift Region( DDR) Impact Avalanche Transit Time( IMPATT) diodes. In simulation study we have considered the flat DDR structures of IMPATT diode based on GaP,GaAs,si and GaN( wurtzite,wz) material. The diodes are designed to operate at the millimeter window frequencies of 94 GHz and 220 GHz. The simulation results of these diodes reveal GaP is a promising material for IMPATT applications based on DDR structure with high break down voltage( V_B) as compared to si and GaAs IMPATTs. It is also encouraging to worth note GaP base IMPATT diode shows a better output power density of 4. 9 × 10~9 W/m^2 as compared to si and GaAs based IMPATT diode. But IMPATT diode based on GaN( wz) displays large values of break down voltage,efficiency and power density as compared to si,GaAs and GaP IMPATTs.

关键词： lmpact avalanche transit time(IMPATT) GaP GaN microwave and millimetre wave

The transition from backarc extension to Andean growth:Insights from geochronologic,sedimentologic,and structural studies of Mesozoic and Cenozoic sedimentary and volcanic rocks in south-central Chile(36°s)

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Geoscience Frontiers 2024年第5期15卷 93-117页

作者： Alfonso Encinas Nicolás Henríquez Daniel Castro Darío Orts Diego Kietzmann Franco Iovino Paulo Vásquez Andrés Folguera Victor Valencia Facundo Fuentes Departamento de Ciencias de la Tierra Facultad de Ciencias QuímicasUniversidad de ConcepciónVíctor Lamas 1290Concepción 4030000Chile Universidad Nacional de Río Negro.Instituto de Investigación en Paleobiología y Geología.General Roca Río NegroArgentina Instituto de Investigación en Paleobiología y Geología(IIPG).CONICET.Av.J.A.Roca 1242 8332 General RocaRío NegroArgentina Universidad de Buenos Aires Facultad de Ciencias Exactas y NaturalesDepartamento de Ciencias GeológicasCiudad UniversitariaPabellón ⅡIntendente Güiraldes 2160C1428EHA Ciudad Autónoma de Buenos AiresArgentina CONICET-Universidad de Buenos Aires Instituto de Geociencias BásicasAmbientales y Aplicadas de Buenos Aires(IGeBA)Ciudad UniversitariaPabellón ⅡIntendente Güiraldes 2160C1428EHA Ciudad Autónoma de Buenos AiresArgentina Instituto de Estudios Andinos“Don Pablo Groeber”(IDEAN) CONICET-Universidad de Buenos AiresBuenos AiresArgentina Facultad de Ciencias Exactas y Naturales Universidad de Buenos AiresBuenos AiresArgentina Washington state University School of the EnvironmentPullmanUSA Yacimientos Petrolíferos Fiscales(YPF)s.A. Buenos AiresArgentina

Many studies propose a significant shift in the tectonic and paleogeographic evolution of the Andes in south-central Chile and Argentina during the Late *** has been proposed that the preceding Jurassic-Early Cretaceous extensional regime that resulted in a low-relief volcanic arc and the backarc Neuquén basin came to an end,giving way to shortening and Andean growth from the Late Cretaceous ***,there are disagreements regarding the timing and nature of this transition to Andean *** address these issues,we conducted geochronologic(U-Pb and^(40)Ar/&(39)Ar),sedimentologic,and structural studies on Mesozoic-Cenozoic sedimentary and volcanic rocks in the Río Maule area(Principal Cordillera,Chile,36°s).From our findings and prior analyses,we propose the following tectono-stratigraphic evolution of the region.(1)Marine deposition of the Tithonian-Hauterivian Baños del Flaco Formation took place in an extensional backarc basin.(2)After a~40 Myr hiatus,fluvial deposits of the Colimapu Formation and volcanic rocks of the Plan de los Yeuques Formation accumulated during the *** the Colimapu Formation displays evidence of syndepositional shortening,the Plan de los Yeuques Formation exhibits synextensional growth *** to other studies,our results suggest that the Chilean part of the Principal Cordillera was largely a zone of active deposition rather than an elevated fold-thrust belt during the Late *** propose that sedimentation occurred within a series of relatively stable intermontane subbasins generated by shortening,followed by extension.(3)After a~20 Myr hiatus,middle Eocene to early Miocene(Lutetian-Aquitanian)accumulation of a thick succession of andesitic lavas and minor clastic sediments of the Abanico Formation occurred in an intraarc extensional basin.(4)Finally,major shortening and uplift of previously deposited Mesozoic-Cenozoic rocks took place throughout the *** phase constitu

关键词： Andes south-central Chile Backarc basin Foreland basin Fold-thrust belt

Effect of sonication-cooking on the immunoreactivity of soy slurry from germinated soybeans

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Food Innovation and Advances 2023年第2期2卷 60-68页

作者： Akshaya Ravindran Hosahalli s Ramaswamy Department of Food science McGill UniversityMacdonald Campus21111 Lakeshore RoadSte Anne de BellevueQuebec H9X 3V9Canada

soy proteins are globular in nature and are resistant to denaturation with lower intensity thermal treatments like ***,germination can also alter the protein structure through the activity of various enzymes and sonication can disrupt the molecular structure through cavitation and other ultrasound effects,and contribute to some reduction in immunoreactivity(IR)of *** study evaluated the effects of germination and sonication pretreatment in combination with common cooking on lowering the soy allergen *** was carried out for up to 120 h and ultrasound sonication treatments were given for 20,40 and 60 min at room *** at 100 oC was carried out for 10 to 60 *** soy allergen IR was evaluated using a commercial sandwich ELIsA *** combined action of germination,sonication and cooking helped to reduce the soy allergen IR to single digit mg/L levels from the nearly 400 mg/L initial level in the 5%soy slurry(>99%reduction).These levels are lower than the reported threshold values of soy allergens in *** addition,the germination and ultrasound process was shown to reduce the anti-nutritional properties and enhance the phenolic and radical scavenging activity by over 50%.

关键词： cooking soybean treatment

The effect of downstream resistance on flow diverter treatment of a cerebral aneurysm at a bifurcation: A joint computational-experimental study

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Journal of Hydrodynamics 2018年第5期30卷 803-814页

作者： ANDerson C.O.Tsang Billy Y.s.Yiu Abraham Y.s.Tang W.C.Chung Gilberto K.K.Leung AlexANDer K.K.Poon Alfred C.H.Yu simon s.M.Lai K.W.Chow Department of surgery Li Ka Shing Faculty of Medicine University of Hong Kong Department of Electrical and Computer Engineering University of Waterloo Department of Mechanical Engineering University of Hong Kong Department of Electrical and Electronic Engineering University of Hong Kong

Intracranial aneurysm can lead to hemorrhagic stroke upon rupture. Deployment of flow diverters can restrict the blood flow into aneurysm and mitigate the rupture risk. Computational fluid dynamics（CFD） and ultrasonography with pulse-wave and color Doppler ultrasound measurements were employed jointly to investigate the complex flow pattern in cerebral aneurysms, both before and after the deployment of flow diverters. Patient-specific configurations of both bifurcation and side-wall aneurysms were selected. The effect of downstream flow resistance was investigated by adjusting the volume flow rate and pressure at the outlet vessels computationally and experimentally. Velocity profiles in the aneurysm measured from ultrasonography showed good agreement with those from computer simulations. The discrepancy in velocity between the computational and experimental sets of data is less than 10%. The downstream resistance can alter the volume flux into a bifurcation aneurysm with a flow diverter deployed by 236%, while the corresponding value of a side-wall aneurysm is negligible. The vorticity of the aneurysmal flow was reduced by more than 80% in both cases after stenting. This study demonstrated that careful investigation of downstream flow resistance of a bifurcation aneurysm is essential to provide an accurate assessment of the aneurysmal flow dynamics after flow diverter deployment.

关键词： Intracranial aneurysms computational fluid dynamics (CFD) doppler ultrasound

Morphological and mechanical characterization of a PMMA/Cds nanocomposite

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Frontiers of Chemical science and Engineering 2011年第2期5卷 258-263页

作者： Vishal MATHUR Manasvi DIXIT K.s.RATHORE N.s.sAXENA K.B.sHARMA semi-conductor&Polymer science Laboratory 5-6Vigyan BhawanUniversity of RajasthanRajasthan 302004India

Thickﬁlm of poly(methyl methacrylate)(PMMA)/Cds nanocomposite have been synthesized by the solution casting *** nanostructure of the Cds particles has been ascertained through the small angle X-ray scattering(sAXs)*** surface morpholo-gical characterization of the PMMA/Cds nanocomposite has been done through scanning electron microscopy(sEM)*** variation of mechanical loss factor(Tanδ)with temperature and tensile properties of prepared samples have been studied using Dynamic Mechanical Analyzer(DMA).This study reveals that the glass transition temperature(Tg),Young’s modulus,and fracture energy of the PMMA/Cds nanocomposite are greatly inﬂuenced by the existence of interfacial energetic interaction between dispersed Cds nanoparticles and the matrix of PMMA.

关键词： poly(methyl methacrylate)(PMMA) ﬁller nanoparticles polymer semiconducting nanocomposite tensile properties glass transition temperature

Pathogenicity of Vibrios in Fish: an Overview

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Journal of Ocean University of Qingdao 2003年第2期2卷 117-128页

作者： Norman Y.s.Woo Department of Biology The Chinese University of Hong KongShatinN.T.Hong Kong SARP.R.China

Bacteria of the genus Vibrio are ubiquitously distributed in the marine environment. Due to the rapid expansion of intensive mariculture and the consequent deterioration of culture conditions, more and more Vibrio spp. have been recognized as pathogenic agents in outbreaks of vibriosis, a serious epizootic disease affecting most wild and farmed fish species worldwide, which has become the most important limiting factor for the development of intensive mariculture industry. Attempts have been made to understand the pathogenicity of vibrios in host fish with the ultimate aim of elucidating the best means for disease control. After an extensive literature survey of the recent advances in the field of fish vibriosis, the pathological changes, virulence factors and associated potential pathogenic mechanisms, transmission routes and related environmental factors involved in outbreak of vibriosis, as well as the controlling strategies are reviewed in the present paper.

关键词： Vibrio spp. vibriosis pathogenicity fish