学科分类
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405 个结果
  • 简介:借助于原子parton,分发仅仅与雷普顿学习了深无弹性的散布试验性的数据,J/正常原子吸收“并且精力损失效果在HERA和RHIC精力在一个Glauber形式体系被学习。假设吸收穿过节abs与集体精力的charmonium核子中心增加,结果在RHIC精力在快y上揭示abs的重要依赖。起始状态的精力损失效果,仅仅在HERA精力被发现重要,也被考虑,并且当我们在低碰撞精力学习了吸收效果时,它的影响应该被消除。最后,我们也为LHC介绍理论预言。

  • 标签: 能量损失 吸收截面 生产 RHIC HERA 非弹性散射
  • 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。

  • 标签: 多级装配与生产控制系统 计划交货时间 最优化系统 材料需要量计划
  • 简介:Sinomagneticstechnologyisahigh-techenterprisespecializinginR&Dandproductionofrareearthpermanentmagnetmaterials.Itisreportedthattheenterprisehasacceleratedtheconstructionofannual3000tonsofhighperformancesinteredNdFeBproductionbase,andtheconstructionofthebasehasbeencompletedandputintouse.

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  • 简介:ZhouShengtao,StandingViceDirectorofAllChinaFederationofSupply&MarketingCooperativesandChairmanofChinaCottonAssociation,showsthatdomesticcottonproductionshortofdemandwillcontinuetoexistandmaygetsevere.Bytheendofthe11thFive-yearPlan,50%of

  • 标签: 中国棉花协会 棉花市场 对外贸易 价格竞争
  • 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.

  • 标签: Energy wood POLICY design Precommercial THINNING
  • 简介:在这篇论文,我们建议一个并发的生产工程系统(处理)为灵活转移线(FTL)在一个限制区域的布局设计。处理第一在FTL在每台机床的海湾前面决定缓冲区尺寸然后初始化一台计算机在一个限制区域拉FTL的帮助设计(CAD)系统。我们开发集成于一个单个框架的一套模块系统,根据并发的工程的实践。并发的工程包含这些活动的合作。它期望了发展处理能改进在生产工程师的家之间的合作和植物设计者。这能被启用做生产工程师将更好使决定考虑成为FTL缓冲区尺寸。

  • 标签: 计算机辅助设计 并行工程学 规划设计 生产模拟
  • 简介:OnDecember18,2018theproject“Developmentandapplicationofcleanandhigh-efficiencypackageofone-million-tonclassethyleneproductionunit”jointlyundertakenbytheSinopecEngineeringIncorporationandothernineinstitutionspassedtheappraisalofscientificandtechnicalachievementorganizedbytheChinaPetroleumandChemicalIndustryAssociation.ThemembersoftheAppraisalCommitteeunanimouslyrecognizedthatthistechnicalachievementhasbeenspearheadingthecontinuedinnovationofethylenetechnologytopushforwardtherapiddevelopmentofethyleneindustryandrelateddownstreamindustrialsectorsandcommandaleadingpositionamonginternationalrivalingpeers.

  • 标签: SINOPEC project SINOPEC forward COMMAND CLEAN
  • 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.

  • 标签: TECHNICOLOR模型 非线性光学 审判 国际 矫正 希格斯玻色子
  • 简介:GiventhenullresultsofsearchesfornewphysicsattheLHC,weinvestigatetheone-loopeffectsSUSYQCDintheprocesse+e-→tgattheILCinMinimalSupersymmetricStandardModel(MSSM).WefindthattherelativeSUSY-QCDcorrectionstothecrosssectionofe+e-→tgcanmaximallyreach6.5%(3.2%)attheILCwith(1/2)s=1000GeVwhenm1=313.4GeVandmg=500(1500)GeV.

  • 标签: TOP QUARK ILC QCD
  • 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.

  • 标签: HYDRODEOXYGENATION ETHANE acetic acid BIO-OIL PT/TIO2
  • 简介:OnMarch16,2013theunitforhydrogenproductionthroughmethanolcrackinghadproducedqualifiedhydro-genattheZhongyuanPetrochemicalCompany(ZPC),withthepurityofhydrogenreaching99.99%torealize

  • 标签: 制氢装置 石化公司 甲醇裂解 中原 ZPC
  • 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.

  • 标签: TROPICAL FOREST DISTURBANCE BIOMASS PRODUCTION Carbon
  • 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

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  • 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。

  • 标签: FCC 催化剂 催化裂解 石油炼制
  • 简介:Theeffluentfromphenylaceticacid(PhCH2COOH)productionprocesscanbetreatedwithNDA-999macroporouspolymericadsorbentwithabout100%remopvalefficiencyofPhCH2COOH,benzylalcohol(PhCH2OH)andbenzaldehyde(PhCOHO)aswellasthedecreaseinTotalOrganicCarbon(TOC)from4691mg/lto<300mg/L.3.7kgphCH2COOHand120kgNaClwillberecoveredfromperm^3wastewaterandtheadsorbentcanbereusedafterbeingregeneratedbyNaOHaqueoussolutionandmethanol.Goodeconomic,socialandenvironmentalresultscanbeachievedwiththismethod.

  • 标签: 苯乙酸 聚合吸收剂 废水处理