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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

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

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

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

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

Down-and up-conversion processes in Nd^(3+)/Yb^(3+)co-doped sodium calcium silicate glasses with concomitant Yb^(2+)assessment

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Journal of Rare Earths 2023年第3期41卷 342-348,I0001页

作者： R.F.Muniz V.s.Zanuto M.s.Gibin J.V.Gunha A.Novatski J.H.Rohling A.N.Medina M.L.Baesso Departament of science State University of MaringáAv.Reitor Zeferino Vaz s/nGoioerê87360-000PRBrazil Departament of Physics State University of MaringáAv.Colombo 5790Maringá87020-900PRBrazil Departament of Physics State University of Ponta GrossaAv.Carlos Cavalcanti4748Ponta Grossa 84030-900PRBrazil

Novel Nd^(3+)/Yb^(3+)co-doped sodium calcium silicate glasses were prepared by melting quenching method:spectroscopic study was carried out as a function of doping content by fixing sensitizer(Nd^(3+))concentration to 0.2 mol%and adjusting activator(Yb^(3+))from 0 to 1.0 mol%.The energy transfer(ET)mechanisms between Nd^(3+)and Yb^(3+)are discussed based on their energy levels and excitation powerdependence emission *** show that the presence of Yb^(2+)might be considered for the Nd^(3+)-free and co-doped *** ET was confirmed by the down-conversion NIR emission spectra of the doped and co-doped samples under excitation at 808 *** mechanisms observed seem to involve only one VIs absorbed photon for each NIR emitted via direct energy transfer between^(4)F_(3/2)of Nd^(2+)and^(2)F_(5/2)of Yb^(3+)compensated by phonon assistance due to energy gap between these *** efficiency of ET increases with the ytterbium content up to almost 90%for the sample with 1 mol%of Yb2O3,which was evaluated by lifetime ***-conversion photoluminescence by exciting trivalent ions of neodymium(808 nm)and ytterbium(975 nm)is *** observed up-converted emission bands are related to the 4f-4f transitions of Nd^(3+)and the spin-forbidden 5d-4f transition of Yb^(2+).Nd^(3+)upconversion emission is observed under 975 nm excitation,presenting an almost quadratic emission dependence with power excitation,which suggests that two laser photons participate in the up-conversion(UC)process,showing that ET occurs by a phonon-assisted energy transfer and cooperative energy transfer.

关键词： solar cells Energy transfer Glassy systems Rare earths

Contemporary solutions for patients with microtia and congenital aural atresia-Hong Kong experience

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Journal of Otology 2016年第4期11卷 -页

作者： Willis s.s.Tsang Michael C.F.Tong Peter K.M.Ku Kunwar s.s.Bhatia Joannie K.Y.Yu Terence K.C.Wong C.Andrew van Hasselt Department of Otorhinolaryngology Head and Neck Surgery The Chinese University of Hong Kong Prince of Wales Hospital Department of Imaging & Interventional Radiology The Chinese University of Hong Kong Prince of Wales Hospital

Managing microtia patients is always a challenge. Multidisciplinary approach, good family support, well established doctorepatient rela-tionship and well organised patient-support groups are the essential elements for success. With the advancement of implantable hearing devices, more options will be available for the microtia patients. Otologists play a leading role in the whole management process. They not only provide proper guidance to the patients in choosing the correct path of the treatment, but also play a key role in organising and maintaining a cost-effective multidisciplinary rehabilitation team for the microtia patients.

关键词： Microtia Congenital aural atresia Implantable hearing aids Bone conduction

Comparison of microstructure and mechanical behavior of Ti-35Nb manufactured by laser powder bed fusion from elemental powder mixture and prealloyed powder

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Journal of Materials science & Technology 2022年第10期105卷 1-16页

作者： J.C.Wang Y.J.Liu s.X.Liang Y.s.Zhang L.Q.Wang T.B.sercombe L.C.Zhang school of Engineering Edith Cowan University270 Joondalup DriveJoondalupPerthWA 6027Australia school of Engineering M050The University of Western Australia35 Stirling HighwayCrawleyPerthWA 6009Australia Northwest Institute for Nonferrous Metal Research Xi’an 710016China state Key Laboratory of Metal Matrix Composites School of Material Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China

Although different types of powder feedstock are used for additive manufacturing via laser powder bed fusion(L-PBF),limited work has attempted to directly compare the microstructure and mechanical behavior of components manufactured from those powder *** work investigated the microstructure,phase composition,melt pool morphology,and mechanical properties of a prealloyed Ti-35Nb alloy manufactured using L-PBF and compared these to their counterparts produced from elemental powder *** samples manufactured from the powder mixture are composed of randomly distributed undissolved Nb in theα/βmatrix,resulting from the unstable melt pool during the melting of the powder *** contrast,parts produced from prealloyed powder display a homogeneous microstructure withβandαphases,owing to the full melting of prealloyed powder,therefore,a more stable melt pool to achieve a homogeneous *** Ti-35Nb manufactured from prealloyed powder exhibits large tensile ductility(about 10 times that of the counterparts using mixed powder),attributed to the high homogeneity in microstructure and chemical composition,strong interface bonding,relatively low oxygen content,and the existence of a large amount ofβ*** work sheds insights into understanding the effect of powder feedstock on the melt pool stability therefore the microstructure and mechanical behavior of the resultant parts.

关键词： Titanium-niobium Powder bed fusion Additive manufacturing Melt pool stability Microstructure Mechanical properties