简介:Supernovaexplosionisapeculiarastronomicalphenomenon,whichhasarousedgreatinterestandextensiveresearchbyastronomers.Atpresent,however,itiserroneouslybelievedthatthesupernovaexplosionisasplendidfuneralofadyingstar.Infact,newastronomicalobservationsandtheauthor’stheoreticalstudieshaveshownthatintheprocessofastar’snever-endingevolution,numeroussupernovaexplosionsmayoccur,andsupernovaexplosionwillrunthroughmanystagesofstellarevolution.Whenevertheatmosphereofthestarbecomesverydenseanditssurfaceiscoveredwithathicklayerofmaterialagain,athermonuclearreactioncanbeignitedagain,causingasupernovaexplosion.Especially,whenthestarhasundergoneanumberofsupernovaeexplosionsanditssurfaceiscoveredwithmultiplelayersofsupernovaexplosionremnants,thecoreofthemassivestarmayundergosuddengravitationalcollapse,causingaviolentsupernova;whenastarisimpactedbyafallingcelestialbody,italsoproducesviolentsupernovaexplosions.
简介:-Thisarticlebriefshowtoimprovetheholdingpowerofadrillingvessel’sanchorandtoremovethoseunreasonablestructuresbysuchatechnology-underwater-explosiontechnology.Thearticlegivesdetailsofthestructure,characteristicsandapplicationsofarocket-launchedanchor;aswellastheprinciple,properties,applicationsofdirectionalexplosioncutting.
简介:随城市里的国内煤气的消费和在中国的镇的增加,煤气的爆炸事故相当经常发生了,并且许多结构极大地被损坏。合理物理设计能保护结构免受被破坏的伤害,但是爆炸负担的字符一定由建立一个正确机械模型模仿发泄的煤气的爆炸第一是有学问的。爆炸过程向化学工业设备的安全被学习许多年了。这些研究的关键问题通常是方程包含了必须被试验性的数据评估的一些可调节的参数,并且计算的过程是极其复杂的,因此这些研究的可靠性严重被限制。把研究基于这些,一个简单数学模型被使用发泄方程的精力保存,集体保存,煤气的州的方程,绝热压缩方程和气体在这篇论文建立。爆炸负担必须被考虑房间布局估计;压力上升的率然后被使用一个骚乱因素改正,因此压力时间曲线能被获得。由使用这个方法,复杂计算被避免,当试验性、计算的结果相当适合很好时。一个典型矩形的房间里的一些压力时间曲线被计算在爆炸压力上调查不同点火地点,煤气的厚度,集中,房间尺寸和发泄的区域的影响。结果显示了那:当在这个房间的几何学中心被点燃时,它是最危险的条件;更大燃烧速度,更坏的发泄效果;越大发泄的压力,越higher山峰压力;越大发泄的区域,越多降低山峰压力。
简介:Inordertofurtherreducethesulfurcontentingasoline,anewdesulfurizationprocesswasproposedbyusingcatalyticoxidationandextractionrealizedinanelectrochemicalfluidizedreactor.Thefluidizedlayerofloadedcatalystparticlesconsistedofleaddioxide(PbO2)supportedonactivatedcarbonparticles(PbO2/C)andtheelectrolytewasaqueousNaOHsolution.ThePbO2/Cparticleanodescouldremarkablyacceleratetheelectrochemicalreactionrateandpromotetheelectrochemicalcatalysisofsulfurcompounds.Thesulfurcompoundswereatfirstoxidizedtosulfonesorsulfoxides,whichwerethenremovedafterextraction.Theexperimentalresultsindicatedthattheoptimaldesulfurizationconditionswereasfollows:Thecellvoltagewas3.2V,theconcentrationofhydroxylionsinelectrolytewas0.12mol/L,andthefeedratewas300mL/min.Undertheseconditionstheconcentrationofsulfuringasolinewasreducedfrom310ppmto70ppm.Basedontheseexperimentalresults,amechanismofindirectelectrochemicallycatalyticoxidationwasproposed.
简介:Planechargeexplosiontechnique(PCET)isoneofthemajortechniquesfrequentlyusedinlarge-scaleblast-resistantstructuretests.AnFEMmodelwasestablished,whichcansimulatetheprocessofairreleasingfromtheblastcavity.Theeffectsofthechargedensity,theintervalofthechargestrip,thedistanceofthechargesfromthestructure,andthemassofbackfillsoilontheoverpressuresappliedonthetestedstructureswereanalyzedbytheFEMmodel.Thequantitativerelationshipsbetweenthepeakvalueandthedurationoftheoverpressureandtheabove-mentionedaffectingparameterswereestablished.Agreementbetweennumericalresultsandthetestdatawasobtained.
简介:By"concealedexplosionofmagma",wemeantheexplosiveproessofmagmaundersubterraneanconcealedconditionswhichisessen-tiallysimilartovolcaniceruptionseenatthesurface;theonlydiffer-"nceisthatthelattertakesplaceinanopenenvironmentatthesurface’`vhiletheformertinasemi-openenvironmentbelowathincovernearlhesurfac
简介:Inordertomeettheurgentneedforreducingolefincontentincrackednaphtha,theinfluenceoffeedstockcharacteristicsontheolefincontentwasdiscussed.ThedifferenttypesandperformanceofcatalystsdevelopedbyRIPPwereintroduced.Moreover,someeffectiveoperationapproachesincommercialunitswerepresentedtoserveasareferencetotherefinersforcatalystselection.
简介:在FCC汽油的硫混合物的形成上的石蜡的效果在在从400~500的温度联合起来的一张小规模的固定的使流体化的床(FFB)上被学习,重量时时10h-1的空间速度(WHSV),和6的催化剂/油比率。结果证明在FCC汽油包含的C4-C6石蜡能与H2S反应主要形成thiophenes,alkyl-thiophenes以及thiols的部分数量,当象heptene那样的大分子的石蜡能与形成benzothiophenes的氢硫化物反应时。在不同催化剂上在不同温度形成的硫混合物的数量与在化工物品的石蜡的集体部分成比例,与在REUSY催化剂超过上形成的硫混合物的数量,那些在石蜡变换的度上由于催化剂性能的效果和催化剂的影响在形状上形成了选择沸石催化剂。因为为硫的形成的热力学、运动的常数上的温度的影响,在450点的最大值和在400点的最小象在石蜡变换degree.Based上一样加重在上的产生的硫混合物和他们到达的增加的数量上述学习,为与H2S在FCC汽油在石蜡的反应之上产生的硫混合物的预言的一个反应网络和一个模型被建立。
简介:Inselectingrationaltypesofundergroundstructuresresistingexplosion,inordertoimprovestressstatesofthestructuralsectionandmakefulluseofmaterialstrengthofeachpartofthesection,theresearchmethodofcompositestructuresispresented.Adoptingtheanalysismethodofmicro-sectionfreebody,equilibriumequations,constraintequationsanddeformationcoordinationequationsaregiven.MakinguseoftheconceptofgeneralizedworkanddirectlyintroducingLagrangemultiplierspecificinphysicalmeaning,thevalidityoftheconstructedgeneralizedfunctionalisprovedbyusingvariationmethod.Therationalrigiditymatchingrelationshipofcompositestructuresectionispresentedthroughexamplecalculations.
简介:Liquefactiontestingatasaturatedloesssitewasperformedunderthesimulatedearthquakegroundmotioninducedbyartificialexplosionswithmicro-timeintervals.Thetimehistoriesofgroundacceleration,porewaterpressureandtheultimatevalueofresidualstrainwererecordedandmeasured.ThemodifiedFEQdraincomputationsoftwarewasusedtoanalyzetheliquefaction.Boththetestandtheanalysisconfumtheobjectiveoccurrenceofloessliquefaction.Furthermore,thereliabilityofthemethodoftheloessliquefactionanalysisbasedonFEQdrainandthemodelofporewaterpressuredevelopmentofsaturatedloessareexamined.
简介:多保护是在安全管理的一个原则,并且反爆炸的使用和耐火的代理人是它的关键部分。在这份报纸,反爆炸的领域里的nano氧化物粒子的性质并且耐火被分析。纳米粒子的沉积速度是计算的。CH4作为一个例子被拿,并且它起始的阶段的燃烧机制被结束。反应系统的分子的精力上的15氧化物的效果与程序Hyperchem6被计算,并且在激进分子和氧化物之间的可能的接触方式被得到。氧化物例如ZrO2,能与激进分子结合,这被结束,并且因此阻止燃烧反应。nano-ZrO2暴发地产生了喷雾器,这被发现比在用作反爆炸和耐火的代理人的另外的对应物优异,因此,将在安全管理起一个日益重要的作用。
简介:Therestrictiononsulfurlevelingasolinehasbeenincreasinglytightened.TheU.S.TierⅡregulationrequiresareductionfromaverage340ppmto30ppmfrom2004to2008.Recentlysignificantprogresshasbeenmadeineffectivehighsulfurremoval,suchasposttreatmentofFCCgasolinebyselectivehydrotreating,SZorbsulfurremovaltechnology,OATSprocessetc.ThesulfurcontentofFCCgasolinecanbedeceasedtolessthan10ppm.WithregardtogasolinepoolcompositioninChina,itisveryimportanttolookforeffectivedesulfurizationprocessesthataresimple,straightforward,withlesshydrogenconsumption.Post-treatmentofFCCgasolineisapreferredoption.Fromthepointofviewofcomprehensiveutilization,alkylation,polymerization,isomerisationetc.canbeaddedtodesulfurizationprocesstomeettherequirementofultralowsulfur,premium.
简介:Owingtotheexistenceoftheflowfieldboundary,theshockwaveloadneartheboundaryisdifferentfromthefreefieldshockwaveload.Inthepresentpaper,thehullplateloadsubjectedtounderwatershockwaveisinvestigatedbasedonwavemotiontheories;inaddition,theexperimentalstudyofthehullplateloadiscarriedout.Accordingtothetheoreticalanalysisofthehullplatepressure,wefindthatthehullplatepressureoscillatesrepeatedlyanddecaysrapidlywithtimepassing,themaximumhullplatepressureis2/(1+n)timesthemaximumfreefieldpressure,wherenistheratioofimpedance,andtheimpulseismuchsmallerthanthefreefieldimpulse.Comparedwiththeexperimentalstudy,thetheoreticalresultsagreewellwiththeexperimentaldata.
简介:Theprinciplesandfeaturesofthepressure-liquidometerusingopticalfibersensor,whichissuitabletouseindangerousareas,aredescribed.Theinstrumentiseapeciallysuitableforautomaticdetectingofpressureandliquidlevelindangerousaslargesacleoiltanker,caveoiltanker,civicliquid-gastankerandsoon.
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简介:Theoretical–computationalstudiesoftable-toplaser-drivennuclearfusionofhigh-energy(upto15MeV)deuteronswith7Li,6Li,andDnucleidemonstratetheattainmentofhighfusionyieldswithinasource–targetreactiondesign.ThisconstitutesasourceofCoulomb-explodingdeuteriumnanodropletsdrivenbyanultraintensefemtosecondnear-infraredlaserandasolidhollowcylindricaltargetcontainingthesecondelement.Thesource–targetreactiondesignattainsthehighesttable-topfusionefficiencies(upto4×109J1perlaserpulse)obtainedtodate.Thehighestconversionefficiencyoflaserenergytonuclearenergy(102–103)fortable-topDDfusionattainedinthesource–targetdesigniscomparabletothatforDTfusioncurrentlyaccomplishedfor‘bigscience’inertialfusionsetups.
简介:Recentlytheproject'Developmentofpackagetechnologyforregenerationofstyrenethroughextractivedistillationofpyrolysisgasoline(STED)'undertakenjointlybytheSINOPECResearchInstituteofPetroleumProcessing(RIPP)andotherinstitutionshaspassedtheappraisalheldinBeijing.Theexpertgroupattendingtheappraisal