简介:TheFinalBattleAgainstPovertyChinahasannouncedtotheworlditscommitmenttoeliminatingpovertybytheendofthecentury.Greatprogresshas...
简介:TheSaemangeumprojectincludeswell-developedtidalflats,twoestuariesoftheMankyeongandDongjinrivers,andachainofsmalliskandsintheouterareaoffthedikebyreclaimingasurfaceareaof40100ha.Alongseadikeof30kmhasbeenconstructedinthemid-westareaofKorea.ThispaperdescribestheconstructionoftidaldikesfocusingonthefinalclosureoperationperformedinApril,2006employingintermediatetechnology.Predictivemodellingwasalsocarriedouttopredictthereal-timeflowfieldsduringthegradualclosureoperationofthefinalstage.
简介:Thehigh-powerlaserbeaminthefinalopticsassemblyofhigh-powerlaserfacilitiesisoftenmodulatedbycontaminationparticles,whichmaycauselocalhighlightintensity,therebyincreasingthefilamentarydamageprobabilityforopticalcomponents.Tostudythegeneraldesignbasisforafinalopticsassemblytodecreasetheriskoffilamentarydamage,different-sizedcontaminationparticlesdepositedonacomponentsurfacearesimulatedtomodulatea351-nmlaserbeambasedontheopticaltransmissiontheory,andthecorrespondingsimulationresultsareanalyzedstatisticallyintermsofthepropagationcharacteristicandthelightfieldintensitydistributionofthemodulatedlaserbeam.Thestatisticalresultsshowthatcomponentthicknessanddistancebetweencomponentscantosomeextentbeoptimizedtoreducetheappearanceoflocalhighlightintensity,andthegeneraldesignbasisofcomponentthicknessandarrangementaregivenfordifferentcontrollevelsofparticlesizes.Moreover,thestatisticalresultscanalsopredictthelaserbeamqualityapproximatelyundertheexistingopticsdesignandenvironmentalcleanliness.Theoptimizeddesignforfinalopticsassemblybasedonenvironmentalcleanlinesslevelisusefultoprolongthelifetimeofopticsandenhancetheoutputpowerofhigh-powerlaserfacilities.
简介:GeologicalresearchontheMediterraneanregionispresentlycharacterizedbythetransitionfromdisciplinarytomultidisciplinaryresearch,aswellasfromnationaltointernationalinvestigations.Inordertosynthesizeandintegratethevastdisciplinaryandnationaldatasetswhichareavailable,itisnecessarytoimplementmaximuminteractionamonggeoscientistsofdifferentbackgrounds.Thecreationofproject-orientedtaskforcesinuniversitiesandotherresearchinstitutions,aswellasthedevelopmentoflargeinternationalcooperationprograms,isinstrumentalinpursuingsuchamultidisciplinaryandsupranationalapproach.TheTRANSMEDAtlas,anofficialpublicationofthe32ndInternationalGeologicalCongress(Florence2004),istheresultofaninternationalscientificcooperationprogramwhichbroughttogetherforovertwoyearssixtythreestructuralgeologists,geophysicists,marinegeologists,petrologists,sedimentologists,stratigraphers,paleogeographers,andpetroleumgeologistscomingfromeighteencountries,andworkingforthepetroleumindustry,academia,andotherinstitutions,bothpublicandprivate.TheTRANSMEDAtlasprovidesanupdated,synthetic,andcoherentportrayaloftheoverallgeological-geophysicalstructureoftheMediterraneandomainandthesurroundingareas.TheinitialstimulusfortheAtlascamefromtherealizationoftheextremelyheterogeneousnatureoftheexistinggeological-geophysicaldataaboutsuchdomain.Thesedatahavebeengatheredbyuniversities,oilcompanies,geologicalsurveysandotherinstitutionsinseveralcountries,oftenusingdifferentproceduresandstandards.Inaddition,muchofthesedataarewritteninlanguagesandpublishedinoutletsthatarenotreadilyaccessibletothegeneralinternationalreader.Bysynthesizingandintegratingawealthofpreexistingandnewdataderivedfromsurficialgeology,seismicsectionsatvariousscales,andmantletomographies,theTRANSMEDAtlasprovidesforthefirsttimeacoherentgeologicaloverv
简介:TheShenguang-IIUpgrade(SG-IIUp)facilityisanunder-constructionhigh-powerlaserdriverwitheightbeams,24kJenergy,3nspulsedurationandultravioletlaseroutput,intheShanghaiInstituteofOpticsandFineMechanics,China.Theprototypedesignandexperimentalresearchoftheprototypefinalopticsassembly(FOA),whichisoneofthemostimportantpartsoftheSG-IIUpfacility,havebeencompletedontheninthbeamoftheSG-IIfacility.Thirty-threeshotswerefiredusing1-ωenergyfrom1000to4500Jand3-ωenergyfrom500to2403Jwitha3nssquarepulse.Duringtheexperiments,emphasiswasgiventotheprocessofopticaldamageandtotheeffectsofclean-gascontrol.AnumericalmodeloftheFOAgeneratedbytheIntegratedComputerEngineeringandManufacturingcodeforComputationalFluidDynamics(ICEMCFD)demonstratedthatafluxwithin1–5ls-1anda180speriodiseffectualtoavoidcontaminantsputteringtotheoptics.Thepresenceofsurface‘mooning’damageandsurfacespotslocatedoutsidetheclearapertureareinducedbycontaminantssuchaswire,silicagelandmillimeterorderfiberandmetal.
简介:IGCP421—""""""""NorthGondwanamid-Palaeozoicbioevent/biogeographypatternsinrelationtocrustaldynamics""""""""—wasdirectedtowardsanalysisofbioevents(especiallyglobalextinctionsandrecoveries),majorvariationinbiodiversity,andchangeinbiogeographicdifferentiationalongtheNorthGondwanacontinentalmarginduringthemid-Palaeozoic.Incidentaltothiswasintegrationofthesedatawiththebiofacies/lithofaciesdatabasefortheregioninpursuitofincreasedprecisioninstratigraphicalignmentsandimprovedpalaeogeographicandpalaeoclimatologicsyntheses.
简介:Thispaperisconcernedwithanoptimalcontrolproblemofanablation-transpirationcoolingcontrolsystemwithStefan-Signoriniboundarycondition.Asthecontinuationoftheauthors'previouspaper,theDubovitsRii-MilyutinfunctionalapproachisagainadoptedininvestigationofthePontryagin'smaximunprincipleofthesystem.Thenecessaryoptimalityconditionispresentedfortheproblemwithfreefinalhorizonandphaseconstraints.
简介:掺杂物在在协议的sintering期间定制微观结构起一个关键作用。这些掺杂物可以在体积以内形成稳固的答案,或分离到谷物边界(GB)和稳固蒸汽的接口(免费表面),引起管理质量的一种不同精力充沛的情形的各个在densification和谷物生长期间搬运。在这个工作,控制掺杂物分发的力量,特别地在表面和GB的并发的分离的可能性,基于分离的各自的热含量被讨论。一个方程基于系统的最小的吉布斯精力被导出从试验性的接口精力数据决定分离的热含量,并且当氧化钇的接口energetics上的掺杂物在它sintering的最后的阶段期间稳定了氧化锆,结果适用描绘La的角色。La实质地减少,这被显示出GB和表面精力(不同地)当sintering进行,动态地在这个阶段影响它的驱动力,和作为结果的谷物生长和densification。
简介:在我们讨论基于含碳二叠的stratigraphic的领域调查预定Paleo亚洲的海洋的最后的闭合的这份报纸,在东南的内部蒙古的序列和沉积环境与它的附近的区域的地质学结合了。研究显示出那在期间在Tianshan-HingganOrogenic系统的东方片断含碳二叠,有对大陆人沿岸浅海的巨大的ENE-NE-trending沉积的盆,通过东南的内部蒙古向东从Ejinqi在西方开始进吉林和Heilongjiang。分发更低在广阔区域含碳是稀少的。晚含碳或二叠的暴烈沉积的岩石unconformably总是躺泥盆纪以上单位。上面含碳中间二叠被沿岸浅海的存款统治并且上面二叠,由大陆人存款。晚含碳二叠没有subduction碰撞造山运动的踪迹,逐渐地暗示盆由缩小和shallowing消失了。另外,是笔记感兴趣Ondor和和Hegenshanophioliticm戠獩畣瑩Τ
简介:AbstractBackground:The COVID-19 novel coronavirus is contagious, and the mortality is higher in the elderly population. Lockdown in different parts of the world has been imposed since January 2020. Chronic subdural haematoma (cSDH) has a unique natural history in which symptoms can be non-specific, and the onset is insidious. This study aims to evaluate the impact of the COVID-19 pandemic on the presentation of cSDH.Methods:Consecutive adult cSDH patients admitted from 1 March 2020 to 30 April 2020 were reviewed. Exclusion criteria including those who had no definite history of head injury or the diagnosis of cSDH were made from a scheduled follow-up scan. Corresponding data during the same period in 2019 were reviewed for comparison. The primary outcome was the interval between the initial head injury and the final radiological diagnosis of cSDH. Secondary outcomes include Markwalder chronic subdural haematoma grade upon admission, length of stay in the acute hospital, and the modified Rankin scale (mRS) upon discharge.Results:For the primary outcome, the average interval between head injury and the diagnosis of cSDH was significantly longer at 56.6 days (49 to 74 days, SD 9.83 days) during the period from March to April 2020, versus 29.4 days (17 to 42 days, SD 8.59 days) in 2019 for the corresponding period (p = 0.00703). There was no significant difference in the functional outcome upon discharge.Conclusions:cSDH patients can present late during the COVID-19 lockdown period. The functional outcome was comparable when operations for drainage were timely performed.
简介:In1997,IGCPProjectNo.410wasestablishedtoappraiseknownrecordsofOrdovicianbiotas,inordertoevaluateoneofthegreatest-everdiversificationsoflifeonEarth,between489and443millionyearsago.Datacollectionandanalysisofbiodiversitywerecoordinatedthroughsevenregionalteams,andaglobal“clade”team.