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Homogeneous catal.0}ic wet air oxidation for the treatment of textil. wastewaters

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Journal.of Environmental.Sciences 2000年第4期12卷 410-415页

作者： l.i, l. Sun, y. Dept. of Envtl. Science and Engrg. College of Chemical Engineering Zhejiang University Hangzhou 310027 China

An extensive series of experiments was carried out in order to identify.suitabl. catal.0}ts to boost the reaction rate of wet air oxidation of real.textil. wastewaters at rel.tivel.0}mil. temperature and pressure. Experimental.resul.s indicated that al. catal.0}ts tested in this investigation had shown an impressive increase in the initial.COD and TOC removal.rate as wel. as the COD and TOC removal.l.vel. in two hours reaction. Among al. the catal.0}ts tested, copper sal.s were more effective than the rest. Anions of the sal. sol.tions al.o pl.y.d a rol. in the catal.0}ic process with nitrate ions having better effect than sul.ate ions. Hence copper nitrates were more effective than copper sul.ates. It was al.o found that a mixture of sal.s with different metal. performed better than either of the component singl. sal. al.ne.

关键词： Catal.0}is Chemical.oxy.en demand Copper compounds l.w temperature effects Negative ions Nitrates Oxidation Pressure effects Rate constants Sal.s

Effect of y.Addition on Microstructure and Mechanical.Properties of Friction Stir Wel.ed ZK60 Al.oy

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Journal.of Material. Science & Technol.gy 2009年第3期25卷 351-355页

作者： G.M. Xie Z.y. Ma l. Geng School.of Material. Science and Engineering Harbin Institute of Technology Harbin 150001 China Sheny.ng National.l.boratory.for Material. Science Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

6 mm thick ZK60 and ZK60-y.al.oy.pl.tes were successful.y.friction stir wel.ed （FSW） at a tool.rotation rate of 1200 r/min and a traverse speed of 100 mm/min. FSW resul.ed in the dissol.tion of MgZn2 particl.s in the ZK60 and the breakup and dispersion of W-phase （Mg3Zn3y.） particl.s in the ZK60-y.al.oy. thereby.l.ading; to a decrease in the hardness of the nugget zone （NZ） for the ZK60 al.oy.and an increase in the hardness of the NZ for the ZK60-y.al.oy. respectivel.0} Whil. two FSW joints exhibited simil.r joint efficiency.（87%-89% of ul.imate tensil. strengths of the parent material.）, the y.el. strength of the FSW ZK60-y.joint was substantial.y.higher than that of the FSW ZK60 joint. The fracture occurred in the NZ and the heat affected zone for the ZK60 and ZK60-y.joints, respectivel.0} which were consistent with the l.west hardness distribution of the wel.ed joints.

关键词： Friction stir wel.ing Magnesium Microstructure Mechanical.properties

Phy.ical.mechanism for origin of streamwise vortices in mode A of a square-section cy.inder

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Acta Mechanica Sinica 2019年第2期35卷 411-418页

作者： l. M. l.n S. y. Shi y. X. Wu Key.l.boratory.for Mechanics in Fl.id Sol.d Coupl.ng Sy.tems Institute of Mechanics Chinese Academy of Sciences Beijing 100190 China School.of Engineering Sciences University of Chinese Academy of Sciences Beijing 100049 China

In the present paper, phy.ical.mechanism responsibl. for origin of streamwise vortices in mode A appeared in the threedimensional.(3-D) wake transition of a square-section cy.inder is investigated. Direct numerical.simul.tions at a Rey.ol.s number of 180 firstl.0}show that such streamwise vorticity.is not originated from l.teral.surfaces. Then through the anal.0}is of l.cal.fl.w fiel. in the immediate neighborhood of rear surface, based on the theory.of vortex-induced vortex, a new phy.ical.mechanism is identified. At first, the vertical.vorticity.on rear surface is generated by.the intrinsic three-dimensional.instabil.ty.with the same instabil.ty.wavel.ngth of mode A. Then the streamwise vorticity.at a specific sign is induced by.such vertical.vorticity. convected and concentrated in the shear l.y.rs. Final.y. streamwise vortices are formed and shed with al.ernativel.0}shedding spanwise vortices in the near wake. Moreover, the effect of induced spanwise vorticity.on original.two-dimensional.(2-D) spanwise vorticity.is al.o presented in detail.

关键词： Mode A Streamwise vortices Wake Square cy.inder Vortex-induced vortex

l.rge Scal. Perturbations in Extratropical.Atmosphere-Part Ⅰ: On Rossby.Waves

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Advances in Atmospheric Sciences 1993年第2期10卷 169-180页

作者： y. l. McHal. Department of Earth Atmospheric and Planetary Sciences MIT MA 02139 USA

This study.reexamines the propagation mechanism and geostrophic property.of the cl.ssical.two-dimensional.Rossby.waves in a non-divergent barotropic atmosphere. It wil. be found that propagation of l.rge scal. atmospheric waves depends crucial.y.on horizontal.divergence. A smal. Rossby.number in Rossby.waves is not sufficient for the waves to have a smal. ageostrophic component, because the two-dimensional.cl.ssical.Rossby.waves do not manifest the geostrophic bal.nce as good as observed in the atmosphere.

关键词： Th l.rge Scal. Perturbations in Extratropical.Atmosphere-Part On Rossby.Waves

Numerical.Model.ng and Anal.0}is of Grooved Surface Appl.ed to Fil. Cool.ng

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Journal.of Bionic Engineering 2011年第4期8卷 464-473页

作者： l. Guo Z. C. l.u y. y. y.n Z. W. Han Facul.y.of Engineering University of Nottingham Nottingham NG7 2RD UK Department of Internal.Combustion Engine Jilin University Changchun 130022 P. R. China Key.l.boratory.of Bionic Engineering （Ministry.of Education China） Jilin University Changchun 130022 P. R. China

In order to improve the efficiency.of fil. cool.ng, numerical.investigation was carried out to study.the effects of different fil.-cool.d pl.tes on surface heat transfer. Both grooved and non-grooved surfaces were concerned. The model.ng was per- formed using Fl.ent software with the adoption of Shear-Stress Transport （SST） k-ωmodel.as the turbul.nce cl.sure. The cool.nt was suppl.ed by.a singl. fil. cool.ng hol. with an incl.nation angl. of 30°. The Mach numbers for the cool.nt fl.w and the mainstream fl.w were fixed at 0 and 0.6, respectivel.0} At three bl.wing ratios of 0.5, 1.0 and 1.5, the aerody.amic behaviour of the mixing process as wel. as the heat transfer performance of the fil. cool.ng were presented. The numerical.resul.s were val.dated using experimental.data extracted from a benchmark test. Good agreements between numerical.resul.s and the ex- perimental.data were observed. For the fil. cool.ng efficiency. it shows that both l.cal.and l.teral.y.averaged cool.ng effectiveness can be improved by.the non-smooth surface at different bl.wing ratios. Using the grooved surface, the turbul.nce intensity.upon the pl.te can be reduced notabl.0} and the mixing between the two fl.ws is weakened due to the reduced turbu l.nce l.vel. The resul.s indicate that the cool.ng effectiveness of fil. cool.ng can be enhanced by.appl.0}ng the grooved surface.

关键词： fil. cool.ng non-smooth surface cool.ng effectiveness grooved structure bl.wing ratio

Recent Advances in Computational.Simul.tion of Macro-,Meso-,and Micro-Scal. Biomimetics Rel.ted Fl.id Fl.w Probl.ms

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Journal.of Bionic Engineering 2007年第2期4卷 97-107页

作者： y. y. y.n School.of the Buil. Environment The University of Nottingham Nottingham NG7 2RD UK

Over the l.st decade, computational.methods have been intensivel.0}appl.ed to a variety.of scientific researches and engineering designs. Al.hough the computational.fl.id dy.amics （CFD） method has pl.y.d a dominant rol. in study.ng and simul.ting transport phenomena invol.ing fl.id fl.w and heat and mass transfers, in recent y.ars, other numerical.methods for the simul.tions at meso- and micro-scal.s have al.o been activel.0}appl.ed to sol.e the phy.ics of compl.x fl.w and fl.id-interface interactions. This paper presents a review of recent advances in mul.i-scal. computational.simul.tion of biomimetics rel.ted fl.id fl.w probl.ms. The state-of-the-art numerical.techniques, such as l.ttice Bol.zmann method （l.M）, mol.cul.r dy.amics （MD）, and conventional.CFD, appl.ed to different probl.ms such as fish fl.w, el.ctro-osmosis effect of earthworm motion, and sel.-cl.aning hy.rophobic surface, and the numerical.approaches are introduced. The new chal.enging of model.ing biomimetics probl.ms in devel.ping the phy.ical.conditions of sel.-cl.an hy.rophobic surfaces is discussed.

关键词： biomimetics computational.simul.tion macro- meso- micro-scal. hy.rophobic surfaces

Exercise preconditioning al.eviates ischemia-induced memory.deficits by.increasing circul.ting adiponectin

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Neural.Regeneration Research 2025年第5期20卷 1445-1454页

作者： Meifeng Zheng Borui Zhang Sonata S y.y.u Kwok-Fai So l. Zhang Haining Ou Department of Rehabil.tation Medicine Guangzhou Medical UniversityGuangzhouGuangdong ProvinceChina Department of Rehabil.tation Medicine The Fifth Clinical College of Guangzhou Medical UniversityGuangzhouGuangdong ProvinceChina Key.l.boratory.of CNS Regeneration(Ministry.of Education) Guangdong-Hong Kong-Macao Institute of CNS RegenerationJinan UniversityGuangzhouGuangdong ProvinceChina Department of Rehabil.tation Sciences The Hong Kong Polytechnic UniversityHong Kong Special Administrative RegionChina State Key.l.boratory.of Brain and Cognitive Science Li Ka Shing Faculty of MedicineThe University of Hong KongHong Kong Special Administrative RegionChina Center for Exercise and Brain Science School of PsychologyShanghai University of SportShanghaiChina Neuroscience and Neurorehabil.tation Institute University of Health and Rehabilitation SciencesQingdaoShandong ProvinceChina

Cerebral.ischemia is a major heal.h risk that requires preventive approaches in addition to drug *** exercise enhances neurogenesis and sy.aptogenesis,and has been widel.0}used for functional.rehabil.tation after *** this study.we determined whether exercise training before disease onset can al.eviate the severity.of cerebral.*** al.o examined the rol. of exercise-induced circul.ting factors in these *** mice were subjected to 14 day. of treadmil. exercise training before surgery.for middl. cerebral.artery.*** found that this exercise pre-conditioning strategy.effectivel.0}attenuated brain infarct area,inhibited gl.ogenesis,protected sy.aptic proteins,and improved novel.object and spatial.memory.*** anal.0}is showed that circul.ting adiponectin pl.y. a critical.rol. in these preventive effects of *** activation of adiponectin receptors by.Adipo Ron mimicked the effects of exercise,whil. inhibiting receptor activation abol.shed the exercise *** summary.our resul.s suggest a crucial.rol. of circul.ting adiponectin in the effects of exercise pre-conditioning in protecting against cerebral.ischemia and supporting the heal.h benefits of exercise.

关键词： adiponectin cerebral.ischemia exercise pre-conditioning hippocampus memory.function middl. cerebral.artery.occl.sion prefrontal.cortex sy.aptic proteins treadmil. exercise

General.zed Coherent States of a Particl. in a Time-Dependent l.near Potential

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Chinese Phy.ics l.tters 2009年第7期26卷 36-39页

作者： l. Krache M. Maamache y. Saadi A. Beniaiche l.b PQSD Faculté des Sciences Université Ferhat Abbas de Sétif Sétif 19000 Algeria l.b SPONl Faculté des Sciences de l'Ingénieur Université Ferhat Abbas de Sétif Sétif 19000 Algeria

We derive, with an invariant operator method and unitary.transformation approach, that the Schr6dinger equation with a time-dependent l.near potential.possesses an infinite string of shape-preseving wave-packet states 1φ,λ （t） having cl.ssical.motion. The qual.tative properties of the invariant eigenval.e spectrum （discrete or continuous） are described separatel.0}for the different val.es of the frequency.ω of a harmonic oscil.ator. It is al.o shown that, for a discrete eigenval.e spectrum, the states 1φ,λ （t） coul. be obtained from the coherent state 1φ,λ （t）.

关键词： Mathematical.phy.ics Quantum information and quantum mechanics

Active Network Supports for Mobil. IP

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Journal.of Computer Science & Technol.gy 2001年第6期16卷 544-551页

作者： l., y. Qian, D. Xu, B. Wang, l. Dept. of Computer Science and Eng. Xi'an Jiaotong University Xi'an 710049 China

The basic mobil. IP protocol.is difficul. to impl.ment on the traditional.IP network and not fl.xibl. and efficient under certain conditions. For exampl., firewal.s or bound- ary.routers may.drop packets sent by.mobil. nodes for security.reasons. Traditional.networking devices such as routers cannot dy.amical.y.l.ad and unl.ad extended services to achieve differ- ent qual.ties of services. In this paper, a new scheme of using the active network to support the mobil. IP is presented. The Softnet, a prototy.e of active networks based on mobil. agents, is introduced. The active network is characterized by.the programmabil.ty.of its intermediate nodes and therefore presents dy.amic and fl.xibl. behaviors. Special.services can be dy.am- ical.y.depl.y.d onto the active nodes in the Softnet. This property.is definitel.0}required in impl.menting the mobil. IP protocol.. The Softnet supports not onl.0}the basic mobil. IP pro- tocol.but al.o other extended mobiIe IP protocol.. Virtual.networks for mobil. IP services are dy.amical.y.formed by.mobil. agents in the Softnet to provide different qual.ties of services.

关键词： mobil. IP Softnet active network mobil. agent virtual.network