简介:LargescaleQCDMonteCarlocalculationshavetypicallybeenperformedoneithercommercialsupercomputersorspeciallybuiltmassivelyparallelcomputerssuchasFermilab'sACPMAPS.Commodityclustersequippedwithhighperformancenetworkingequipmentpresentanattractivealternative,achievingsuperiorperformancetopriceratiosandofferingclearupgradepaths.WedescribetheconstructionandresultstodateofFermilab'sprototypeproductioncluster,whichconsistsof80dualPentiumⅢsystemsinterconnectedwithMyrinetnetworkinghardware.Wedescribesoftwaretoolsandtechniqueswehavedevelopedforoperatingsysteminstallationandadministration.WediscusssoftwareoptimizationsusingthePentium'sbuilt-inparallelcomputationfacilities(SSE),Finally,wepresentshortandlongtermplansfortheconstructionoflargerfacilities.
简介:TheCQCisanindependentandimpartialqualitycertificateorganizationwiththirdpartystatusestablishedbytheStateImportandExportCommodityInspectionAdministration(SCIA)inaccordancewiththeLawofCommodityInspectionandgranteditsdutiesandobligationsbytheStateCouncil.Themainaspectsofitsdutiesandobligationsinclude:implementingthecertificationofimportcommoditysafetyandquality;thecertificationofthequalitycontrolsystemandtheenvironmental
简介:Researchsituationofeco-designisanalyzed,andthenthoughtsandmethodsofeco-designarediscused.Theeco-designincludespackagingmodularization,dematerialization,energy-savingandbio-simulation.
简介:ThisarticleanalyzesthefactorsshapingcommercialtimberprofitdistributioninChina’sSouthernCollectiveForestRegion(hereinafterSCFR).Thearticlefirstdescribesthesettinganddistributionofanationalharvestquotaandanalyzesitsequityimpactsonfarmerhouseholds.Basedonaccessmappingofthecommercialtimbercommoditychain,profitdistributionandmechanismsforcontrollingandmaintainingaccesstoprofitareanalyzedfordifferentactorsalongthechain.Thedatashowthatfarmersdonotbenefittoagreatextentfromthecommerce,eveniftheyareendowedwithrightstomanageandharvestforestsandfreelysellcommercialtimberintheregion.Thereareanumberofinstitutionalandnon-institutionalfactorsthatdeterminetheextentofbenefitsfarmersandotheractorsalongthetimbercommoditychaincanseek.Undercurrentarrangements,thedevolutionofforestpropertyintheSCFRdoesnotensurethatfarmerhouseholdsbenefitfromcommercialtimbermarketing.Inordertostimulatefarmers’enthusiasmforforestrehabilitationandmanagement,beyondthedevolutionofforestproperty,itisfirstlynecessarytotakeeffectivemeasurestoimprovefarmeraccesstocommercialtimberprofits.