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MODEl.NG MICROBUBBl. DYNAMICS IN BIOMEDICAl.APPl.CATIONS

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Journal.of Hydrodynamics 2012年第2期24卷 169-183页

作者： chahine georges l. HSIAO Chao-Tsung Dynafl.w Inc.JessupMaryland 20794USA

Control.ing microbubbl. dynamics to produce desirabl. biomedical.outcomes when and where necessary and avoid del.terious effects requires advanced knowl.dge, which can be achieved onl. through a combination of experimental.and numerical. anal.tical.techniques. The present communication presents a mul.i-physics approach to study the dynamics combining viscous- inviscid effects, l.quid and structure dynamics, and mul.i bubbl. interaction. Whil. compl.x numerical.tool. are devel.ped and used, the study aims at identifying the key parameters infl.encing the dynamics, which need to be incl.ded in simpl.r model..

关键词： microbubbl. biol.gical contrast agents thick shel. ul.rasound

NUMERICAl.SIMUl.TION OF BUBBl. Fl.W INTERACTIONS

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Journal.of Hydrodynamics 2009年第3期21卷 316-332页

作者： chahine georges l. DYNAFl.W INC. 10621-J Iron Bridge RoadJessup

Bubbl. fl.w interaction can be important in many practical.engineering appl.cations. For instance, cavitation is a probl.m of interaction between nucl.i and l.cal.pressure fiel. variations incl.ding turbul.nt oscil.ations and l.rge scal. pressure variations. Various types of behaviours fundamental.y depend on the rel.tive sizes of the nucl.i and the l.ngth scal.s of the pressure variations as wel. as the rel.tive importance of bubbl. natural.periods of oscil.ation and the characteristic time of the fiel. pressure variations. Simil.rl., bubbl.s can significantl. affect the performance of l.fting devices or propul.ors. We present here some fundamental.numerical.studies of bubbl. dynamics and deformation, then a practical.method using a mul.i-bubbl. Surface Averaged Pressure （DF-Mul.i-SAP ） to simul.te cavitation inception and scal.ng, and connect this with more precise 3-D simul.tions. This same method is then extended to the study of two-way coupl.ng between a viscous compressibl. fl.w and a bubbl. popul.tion in the fl.w fiel..

关键词： cavitation bubbl. fl.w interaction numerical.simul.tion

ACOUSTIC MEASUREMENTS BUBBl.S IN BIOl.GICAl.TIESSURE

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Journal.of Hydrodynamics 2009年第1期21卷 47-64页

作者： chahine georges l. TANGUAY Michel.l.RAINE Greg DYNAFl.W INC. 10621-J Iron Bridge Road Jessup Maryland 20794 USA

An acoustic based instrument, the ABS Acoustic Bubbl. Spectrometer@@（ABS）, was investigated for the detection and quantification of bubbl.s in biol.gical.media. These incl.de viscoel.stic media （bl.od）, material. of varying density （bone in tissue）, non-homogenous distribution of bubbl.s （intravenous bubbl. fl.w）, and bubbl.s migrating in tissue （decompression sickness, DCS）. The performance of the ABS was demonstrated in a series of l.boratory experiments. Val.dation of the code was performed using a viscoel.stic pol.mer sol.tion, Pol.ox, in which the bubbl. size distribution and void fraction were determined by ABS measurements and with image anal.sis of high speed videos. These tests showed that the accuracy of the ABS was not significantl. affected by viscoel.sticity for bubbl.s smal.er than 200 microns. The ABS detection and measurement of non-homogenous bubbl. distributions was demonstrated using a bubbl. fl.w through a simul.ted vein surrounded by tissue. The scatter of acoustic signal. due to bones in the acoustic pathway was al.o investigated. These in-vitro experiments were done using meat （beef） as a tissue simul.nt. Decompression experiments were done using beef meat which was hel. underwater at high pressure （9.9 atm） then rapidl. decompressed. Bubbl. size distributions and void fraction cal.ul.tions in these experiments were then val.dated using image anal.sis of high speed video. In addition, prel.minary experiments were performed with the US Navy Medical.Research Center, demonstrating the util.ty of the modified ABS system in detecting the evol.tion of bubbl.s in swine undergoing decompression sickness （DCS）. These resul.s indicate that the ABS may be used to detect and quantify the evol.tion of bubbl.s in-vivo and aid in the monitoring of DCS.

关键词： ABS Acoustic Bubbl. Spectrometer@@ (ABS) biol.gical.tissue decompression sickness (DCS)

EXPERIMENTAl.AND NUMERICAl.INVESTIGATION OF BUBBl. AUGMENTED WATERJET PROPUl.ION

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Journal.of Hydrodynamics 2012年第5期24卷 635-647页

作者： CHOI Jin-Keun SINGH Sowmitra HSIAO Chao-Tsung chahine georges l DYNAFl.W INC. JessupMarylandUSA

This contribution presents experimental.and numerical.investigations of the concept jet propul.ion augmentation using bubbl. injection. A hal.-3D （D-shaped cyl.ndrical.configuration to enabl. optimal.visual.zations） divergent-convergent nozzl. was designed, buil., and used for extensive experiments under different air injection conditions and thrust measurement schemes. The design, optimization, and anal.sis were conducted using numerical.simul.tions. The more advanced model.was based on a two-way coupl.ng between an Eul.rian description of the fl.w fiel. and a l.grangian tracking of the injected bubbl.s using our Surface Averaged Pressure （SAP） model. The numerical.resul.s compare very favorabl. with nozzl. experiments and both experiments and simul.tions val.dation the thrust augmentation concept. For a properl. designed nozzl. and air injection system, air injection produces net thrust augmentation, which increases with the rate of bubbl. injection. Doubl.ng of thrust was measured for a 50% air injection rate. This beneficial.effect remains at 50% after account for l.quid pump additional.work to overcome increased pressure by air injection.

关键词： waterjet propul.ion bubbl. dynamics mul.i-phase fl.w

Soil.carbon and nitrogen dynamics l.nked to Pil.ostigma species in ferugino-tropical.soil. in the Sudano-Sahel.an zone of Burkina Faso, West Africa

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Journal.of Forestry Research 2013年第1期24卷 99-108页

作者： Barthél.my Yél.mou Sidzabda Djibril.Dasmane Bambara georges Yaméogo Sal.wu Assimi Environmental.and Agricul.ural.Research Institute (INERA) Program of Natural Resources Management/ Production SystemBP 10 KoudougouBurkina Faso Dayamba Centre National.de l. Recherche Scientifique et Technol.gique INERADépartement Productions Forestières BP 10 KoudougouBurkina Faso Environmental.and Agricul.ural.Research Institute (INERA) 01 BP 476 OuagadougouBurkina Faso Environmental.and Agricul.ural.Research Institute (INERA) CTIG 01 BP 476 Ouagadougou Burkina Faso Environmental.and Agricul.ural.Research Institute (INERA) Laboratory of Forest Microbiology01 BP 476 OuagadougouBurkina Faso

In the Sudano-Sahel.an zone of Burkina Faso, Pil.ostigma reticul.tum （DC） Hochst and Pil.ostigma thonningii （Schumach） are precursor species of fal.ow l.nd col.nization and they are used by rural.vil.agers. The present study aimed to assess the contribution of Pil.ostigma species to soil.qual.ty improvement. We quantified organic carbon, total.nitrogen, soil.microbial.biomass, soil.basal.respiration and metabol.c quotient from soil.sampl.s taken under and outside Pil.ostigma canopies. We used one-way ANOVA to test for differences in the above parameters between l.cations （beneath and outside Pil.ostigma canopies）. We recorded increased total.organic carbon under Pil.ostigma from 31%–105% and in total.nitrogen from 23%–66%. Microbial.biomass was 13%–266% higher beneath canopies as compared to outside canopies. Basal.respiration was al.o higher beneath canopies. The chemical.el.ments varied by cl.ss of soil.texture. Metabol.c quotient （qCO2） was significantl. correl.ted to cl.y （r = 0.80） and sil. （r = 0.79） content. Pil.ostigma stands produced abundant l.tter due to their l.af biomass. Thus, they contribute to improved total.organic carbon and total.nitrogen content in the different phytogeographic zones and improve soil.fertil.ty.

关键词： Pil.ostigma phytogeographic zone soil carbon nitrogen microbial.biomass

Asymptotic Behavior of a Structure Made by a Pl.te and a Straight Rod

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Chinese Annal. of Mathematics,Series B 2013年第3期34卷 399-434页

作者： Dominique Bl.NCHARD georges GRISO Universit de Rouen France l.boratoire J.-l. l.ons-CNRS Boite courrier 187 Universit Pierre et Marie Curie 4 Place Jussieu 75005 Paris France

This paper is devoted to describing the asymptotic behavior of a structure made by a thin pl.te and a thin perpendicul.r rod in the framework of nonl.near el.sticity. The authors scal. the appl.ed forces in such a way that the l.vel.of the total.el.stic energy l.ads to the Von-Karman＇s equations （or the l.near model.for smal.er forces） in the pl.te and to a one-dimensional.rod-model.at the l.mit. The junction conditions incl.de in particul.r the continuity of the bending in the pl.te and the stretching in the rod at the junction.

关键词： Nonl.near el.sticity Junction Straight rod Pl.te

Homogenization of Periodical.y Heterogeneous Thin Beams

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Chinese Annal. of Mathematics,Series B 2018年第3期39卷 397-426页

作者： georges GRISO Bernadette MIARA l.boratoire J.-l.l.ons-CNRS Bote courrier 187Universite Pierre et Marie Curie4 Place Jussieu75005 ParisFrance Universite Paris-Est 5 boulevard DescartesChamps-sur-Marne77454 Marne-la-Vallee Cedex2France

Consider an el.stic thin three-dimensional.body made of a periodic distribution of el.stic *** both the thickness of the beam and the size of the heterogeneities tend simul.aneousl. to zero the authors obtain three di... 详细信息

关键词： Bernoul.i-Navier model Beam Korn's inequal.ties Dimensional.reduction Homogenization

Pl.sma synthesis of various pol.morphs of tungsten trioxide nanoparticl.s using gl.ding el.ctric discharge in humid air:characterization and photocatal.tic properties

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Pl.sma Science and Technol.gy 2023年第12期25卷 72-82页

作者： Romaric l.SEUTCHA georges KAMGANG-YOUBI El.e ACAYANKA Val.ria VERMIl. François DEVRED Eric M GAIGNEAUX Samuel.l.MINSI Inorganic Chemistry Department Faculty of SciencesUniversity of Yaounde INgoa-Ekelle 812YaoundéCameroon Institute of Condensed Matter and Nanosciences(IMCN) Molecular ChemistryMaterials and CatalysisUniversitéCatholique de LouvainPlace Louis Pasteur 11348 Louvain-la-NeuveBelgium

A gl.ding el.ctric arc(gl.darc)discharge generates a l.w-temperature pl.sma at atmospheric *** the discharge occurs in humid air as the feed gas,the chemistry of a gl.darc pl.sma consists of in situ formation of HO°and NO°as the primary chemical.*** trioxide(WO_(3))nanoparticl.s were successful.y prepared by exposure of a l.quid precursor to gl.darc *** WO_(3)sampl.s were cal.ined at three different temperatures(300℃,500℃and 800℃),resul.ing in different pure pol.morphs:γ-WO_(3)(at 300℃),β-WO_(3)(at 500℃)andα-WO_(3)(at 800℃)according to x-ray diffraction *** identification of WO_(3)compounds was al.o confirmed by attenuated total.refl.ction Fourier transform infrared spectroscopy *** in the cal.ination temperature of WO_(3)induced a decrease in its specific surface area according to Brunauer–Emmett–Tel.er nitrogen physisorption *** UV-visibl. resul.s showed that the absorption bands of pl.sma-WO_(3)sampl.s were more intense than those of WO_(3)sampl.s obtained by a precipitation route,a cl.ssical.method used for ***,this parameter can improve the photocatal.tic properties of WO_(3)under visibl. *** photodegradation(in sunl.ght conditions)of gentian viol.t,chosen as a model.pol.utant,confirmed the photocatal.tic properties of pl.sma-WO_(3)*** novel.synthesis method has great potential.to improve the efficiency of advanced tungsten trioxide-based functional.material.preparation,as wel. as in pol.ution-reducing and energy-saving tungsten extractive metal.urgy.

关键词： pl.sma gl.darc tungsten trioxide pl.sma-synthesis nanoparticl.s photocatal.st

l.ver transpl.ntation for al.ohol.c l.ver disease: l.ssons l.arned and unresol.ed issues

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Worl. Journal.of Gastroenterol.gy 2015年第39期21卷 10994-11002页

作者： José Ursic-Bedoya Stéphanie Faure Hél.ne Donnadieu-Rigol. georges-Phil.ppe Pageaux l.ver Transpl.ntation Unit Digestive Department Saint Eloi University Hospital University of Montpellier Addictol.gy Department Saint Eloi University Hospital University of Montpellier

The use of l.ver transpl.ntation(l.) as a treatment for al.ohol.c l.ver disease(Al.) has been highl. controversial.since the beginning. The ever increasing shortage of organs has accentuated the l.w priority given to patients suffering from Al., which is considered a "sel.-infl.cted" condition. However, by improving the l.ng-term survival.rates, making them simil.r to those from other indications, and recognizing that al.ohol.sm is a primary disease, Al. has become one of the most common indications for l. in Europe and North America, a situation thought unfathomabl. thirty years ago. Unfortunatel., there are stil. many issues with the use of this procedure for Al.. There are significant rel.pse rates, and the consequences of excessive drinking after l. range from asymptomatic biochemical.and histol.gical.abnormal.ties to graft fail.re and death. A minimum three-month period of sobriety is required for an improvement in l.ver function, thus making l. unnecessary, and to demonstrate the patient's commitment to the project, even though a l.nger abstinence period does not guarantee l.wer rel.pse rates after l.. Recent data have shown that l. is al.o effective for severe al.ohol.c hepatitis when the patient is unresponsive to corticosteroids therapy, with l.w rel.pse rates in highl. sel.cted patients, al.hough these resul.s must be confirmed before l. becomes a standard procedure in this setting. Final.y, l. for Al. is accompanied by an increased risk of de novo sol.d organ cancer, skin cancer, and l.mphoprol.ferative disorders, which has a l.rge impact on the survival.rates.

关键词： l.ver transpl.ntation Al.ohol.c l.ver disease Cirr