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简介:这篇论文在计划的一个材料要求(MRP)处理计划的铅时间计算的问题在随机的铅时间下面的环境。目的是最小化成立和backlogging费用的和。建议途径基于库存控制决定变量在哪儿是整数的分离时间。系统的二种类型被考虑:连续生产的多水平和汇编系统。为连续生产系统(在每水平的部件的一种类型),一个数学模型被建议。然后,这个模型等价于众所周知的分离报童模型,这被证明。这直接在计划的铅时间提供最佳的价值。为多铺平汇编系统,一个奉献模型被建议,变量和目的工作的决定的一些性质被证明。这些性质被用来在客观功能上在决定变量和更低、上面的界限上计算更低、上面的限制。获得的限制和界限打开可能性开发例如,使用一个分支和界限途径的一个有效优化算法。纸与相应证明和几个数字例子详细论述建议模型。建议模型的一些优点和这研究的观点被讨论。
简介:Sinomagneticstechnologyisahigh-techenterprisespecializinginR&Dandproductionofrareearthpermanentmagnetmaterials.Itisreportedthattheenterprisehasacceleratedtheconstructionofannual3000tonsofhighperformancesinteredNdFeBproductionbase,andtheconstructionofthebasehasbeencompletedandputintouse.
简介:Background:Bioenergyisre-shapingopportunitiesandimperativesofforestmanagement.Thisstudydemonstrates,throughacasestudyinScotspine(PinussylvestrisL.),howforestbioenergypoliciesaffectstandmanagementstrategies.Methods:Optimizationstudieswereexaminedfor15Scotspinestandsofdifferentinitialstanddensities,sitetypes,andtemperaturesumregionsinFinland.StanddevelopmentwasmodeledusingthePipeQualstandsimulatorcoupledwiththesimulation-optimizationtoolOptiForBioenergytoassessthreeforestbioenergypoliciesonenergywoodharvestfromearlythinnings.Results:Theoptimalsolutionsmaximizingbarelandvalueindicatethatconventionalforestmanagementregimesremainoptimalforsparsestands.Energyharvestsoccurredonlywhenprofitable,ledtolowerfinancialreturns.Aforestbioenergypolicywhichincludedcompulsoryenergywoodharvestingwasoptimalfordenserstands.Atahigherinterestrate(4%),increasingenergywoodpricepostponedenergywoodharvesting.Inaddition,ourresultsshowthatearlythinningsomewhatreducedwoodqualityforstandsinfertilesites.Forlessfertilesites,thechangeswereinsignificant.Conclusions:Aconstraintofprofitableenergywoodharvestisnotrational.Itisoptimaltocarryoutthefirstthinningwithaflexibleforestbioenergypolicydependingonstanddensity.
简介:OnDecember18,2018theproject“Developmentandapplicationofcleanandhigh-efficiencypackageofone-million-tonclassethyleneproductionunit”jointlyundertakenbytheSinopecEngineeringIncorporationandothernineinstitutionspassedtheappraisalofscientificandtechnicalachievementorganizedbytheChinaPetroleumandChemicalIndustryAssociation.ThemembersoftheAppraisalCommitteeunanimouslyrecognizedthatthistechnicalachievementhasbeenspearheadingthecontinuedinnovationofethylenetechnologytopushforwardtherapiddevelopmentofethyleneindustryandrelateddownstreamindustrialsectorsandcommandaleadingpositionamonginternationalrivalingpeers.
简介:Aswellknown,iftheHiggsbosonwerenotobservedatLHC,thetechnicolormodelwouldbethemostfavorablecandidateresponsibleforthesymmetrybreaking.Toovercomesomedefectsinthepreviousmodel,someextendedversionshavebeenproposed.IntheTC2modeltypicalsignatureisexistenceofheavyH_(TC)andtechnipionП.Adirectproofofvalidityofthemodelistoproducethemataccelerator.Thuswestudytheproductionratesofe~+e~-→H_(TC)П~0ande~+e~-→П~+П~-atILCinthetopcolor-assistedtechnicolor(TC2)model.Infact,thereisafloodofmodelsbelongingtonewphysics,whichcanresultinproductswithcharacteristicssimilartoH_(TC)+ПoftheTC2model.ThereforetodistinguishthismodelfromothersonemayneedtoinvestigatesomedetailsbycalculatingthecrosssectiontoNLO.WeindeedfindthattheNLOcorrectionsaresignificant,namelytheratioδ2≡(σ_(NLO)-σ_(LO))/σ_(LO)ine~+e~-→H_(TC)П~0exceeds100%withinaplausibleparameterspace.
简介:GiventhenullresultsofsearchesfornewphysicsattheLHC,weinvestigatetheone-loopeffectsSUSYQCDintheprocesse+e-→tgattheILCinMinimalSupersymmetricStandardModel(MSSM).WefindthattherelativeSUSY-QCDcorrectionstothecrosssectionofe+e-→tgcanmaximallyreach6.5%(3.2%)attheILCwith(1/2)s=1000GeVwhenm1=313.4GeVandmg=500(1500)GeV.
简介:ThesupportedPtcatalysts(1wt%)werepreparedbytheincipientimpregnationmethodandanalyzedusingsynchrotron-basedX-raydiffraction,BETsurfacearea,oxygenadsorption,COpulsechemisorption,temperature-programmeddesorption(TPD)ofaceticacid,H2-TPD,NH3-TPD,O2-TPD,andH2-TPR.ThereactivityofPt-basedcatalystswasstudiedusingafixedbedreactorat300Cand4MPaforhydrodeoxygenationofaceticacid,wherePt/TiO2wasveryselectiveforethaneproduction.TPDexperimentsrevealedthatseveralconditionsmustbesatisfiedtoachievethishighselectivitytoethanefromaceticacid,suchasPtsites,moderateacidity,andmediummetal-oxygenbondstrengthintheoxidesupport.Thisworkprovidesinsightsindevelopingnovelcatalyticmaterialsforhydrocarbonproductionsfromvariousorganicsincludingbio-fuels.
简介:Background:Forestbiomassishelpfultoassessitsproductivityandcarbon(C)sequestrationcapacity.Severaldisturbanceactivitiesintropicalforestshavereducedthebiomassandnetprimaryproduction(NPP)leadingtoclimatechange.Therefore,anaccurateestimationofforestbiomassandCcyclingincontextofdisturbancesisrequiredforimplementingREDD(ReducingEmissionsfromDeforestationandForestDegradation)policy.Methods:BiomassandNPPoftreesandshrubswereestimatedbyusingallometricequationswhileherbaceousbiomasswasestimatedbyharvestmethod.Finerootbiomasswasdeterminedfromsoilmonolith.TheCstockinvegetationwascalculatedbymultiplyingCconcentrationtodryweight.Results:Totalstandbiomass(Mg?ha-1)inundisturbedforeststand(US)was960.4whileindisturbedforeststand(DS)itwas449.1.Thebiomass(Mg?ha-1)oftrees,shrubsandherbsinUSwas948.0,4.4and1.4,respectively,whileinDStheywere438.4,6.1and1.2,respectively.TotalNPP(Mg?ha-1?yr-1)was26.58(equivalentto12.26MgC?ha-1?yr-1)inUSand14.91(6.88MgC?ha-1?yr-1)inDS.TotalCinputintosoilthroughlitterplusrootturnoverwas6.78and3.35Mg?ha-1?yr-1inUSandDS,respectively.Conclusions:Severaldisturbanceactivitiesresultedinthesignificantlossinstandbiomass(53%),NPP(44%),andCsequestrationcapacityoftropicalforestineasternNepal.Thenetuptakeofcarbonbythevegetationisfargreaterthanthatreturnedtothesoilbytheturnoveroffinerootandlitter.Therefore,bothstandsofpresentforestactascarbonaccumulatingsystems.Moreover,disturbancereflectshigherCemissionswhichcanbereducedbybettermanagement.
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简介:Background:Thequantitativeimpactofforestmanagementonforests'woodresourcewasevaluatedforPiceaandFagusmixedforests.Theeffectsontheproductivityoftenderingoperations,thinningsandrotationlengthhaveseldombeendirectlyquantifiedonlandscapescale.Methods:Twositesofsimilarfertilitybutsubjecttocontrastedforestmanagementwerestudiedwithdetailedinventories:oneinGermany,theotherinRomania,andcomparedwiththerespectivenationalforestinventories.InRomania,regulationsimposeverylongrotations,lowthinningsandaperiodofno-cutbeforeharvest.Incontrast,tendingandthinningsarefrequentandintenseinGermany.Harvestsstartmuchearlierandmustavoidclearcuttingbutmaintainapermanentforestcoverwithnaturalregeneration.WhileGermanyhasanaverageannualwoodincrementrepresentativeforCentralEurope,RomaniarepresentstheaverageforEasternEurope.Results:ThelackoftendingandthinningintheRomaniansiteresultedintwiceasmanytreesperhectareasintheGermansiteforthesameage.TheproductivityinRomanianproductionforestswas20%lowerthaninGermanydespiteasimilarfertility.Theresultsweresupportedbythedatafromthenationalforestinventoryofeachcountry,whichconfirmedthatthesamedifferentialexistsatcountryscale.Furthermore,providedthedifferenceinrotationlength,twocropsareharvestedinGermanywhenonlyoneisharvestedinRomania.ThelossesofproductionduetoalowerlevelofmanagementinRomaniawhereestimatedtoreach12.8millionm~3·y~(-1)inregularmountainproductionforests,andto15millionm~3·y~(-1)ifmanagedprotectionforestisincluded.Conclusions:TheproductivityofPiceaandFagusmountainforestsinRomaniaisseverelydepressedbythelackoftendingandthinning,byoverlylongrotationsandtheexistenceofa25-yearsno-cutperiodpriortoharvest.TheaveragestandingvolumeinGermanywas50%lowerthaninRomania,butthehigherharvestingrateresultedinmorethandoublingwoodproduct
简介:在这篇论文,为提高轻采油的FCC合作催化剂被大音阶的第五音胶化方法准备,并且它击碎催化剂的残余的表演上的效果在结果显示了的CCFFBreactor.The测试被评估液体产品收益显然增加了,在FCC平衡催化剂的表面与干燥气体的co-catalyst.The收益被使妊娠以后,泥浆和焦炭减少了,当柴油机收益改变了slightly.And时残余的crackability被增加;催化剂表面上的焦炭免职的率被减少,与这些结果显示出的热裂开反应inhibited.All合作催化剂能改进酸地点的密度并且改变催化剂酸味,它能支持由在FCC平衡催化剂的表面上扔合作催化剂延长催化剂活动。
简介:Theeffluentfromphenylaceticacid(PhCH2COOH)productionprocesscanbetreatedwithNDA-999macroporouspolymericadsorbentwithabout100%remopvalefficiencyofPhCH2COOH,benzylalcohol(PhCH2OH)andbenzaldehyde(PhCOHO)aswellasthedecreaseinTotalOrganicCarbon(TOC)from4691mg/lto<300mg/L.3.7kgphCH2COOHand120kgNaClwillberecoveredfromperm^3wastewaterandtheadsorbentcanbereusedafterbeingregeneratedbyNaOHaqueoussolutionandmethanol.Goodeconomic,socialandenvironmentalresultscanbeachievedwiththismethod.