简介：Reactionofglycinewithphosphorustrichlorideinpresenceoftriethylaminehasurnishedtheovelspirohydridophosphorane.Itsstructurehasbeencharacterizedbyelementalanalysis,n.m.r.spectraandmassspectrum.Thecompoundreactedwithphenylisothiocyanatetogive2-phenyliminothiazolid-5-one.

简介：ThecombustionreactivityofricehuskfromNewSouthWales,ustraliawasmeasuredbyheatingcubicalbasketsincontrolledenvironmentandmonitoringthecentretemperature.Frank-Kamenetskii'signitiontheorywasusedtocalculatetheactivationenergy,Resultsagreedwellwithtestsonothercellulosicmaterials,Numericalsimulationsoftemperaturechangeswerecarriedout,usingaspecialtechniquetodealwithnon-linearitiesintheheatconductionequation.ThenumericalResultsindicatethatthetimefactorshouldbetakenintoaccountwhenevaluatingself-combustionrisks.

简介：Theinteractionsofasphericalflamewithanin-cidentshockwaveanditsreflectedshockwaveinaconfinedspacewereinvestigatedusingthethree-dimensionalreactiveNavier-Stokesequations,withemphasisplacedontheeffectofchemicalreactivityofmixtureontheflamedistortionanddetonationinitiationafterthepassageofthereflectedshockwave.Itisshownthatthespatio-temporalcharacteristicsofdetonationinitiationdependhighlyonthechemicalreactivityofthemixture.Whenthechemicalreactivityenhances,theflamecanbeseverelydistortedtoformareactiveshockbifurcationstructurewithdetonationsinitiatingatdifferentthree-dimensionalspatiallocations.Moreover,thedetonationinitiationwouldoccurearlierinamixtureofmoreenhancedreactivity.Theresultsrevealthatthedetonationsarisefromhotspotsintheunburnedregionwhichareinitiatedbytheshock-detonation-transitionmechanism.

简介：ThepaperintroducesthepreparationoffloatingTiO2/beadsphotocalystattachedtothehollowglassmicro-beadssurfacebysol-geltechniqueusingtetrabutyltitanateasmaterialandthepreparationoffloatingCoPcS/TiO2/beadsbydip-coatigtechnique.TheoptimalfactorofdegradationofvegetableoilfloatingonwaterusingCoPcS/TiO2/beadswasstudied.Theresultshowedthattheremovalrateofvegetableoilfloatingonwatercanhighlyreach90%attheoptimalcondition(acidityorneutrality,375Wmedium-pressuremercuryvapourlamp,illumination2h~3h,1gCoPcS/TiO2/beads).ThephotocatalyticremovalefficiencycausingbyCoPcS/TiO2/beadswasincreasedrapidlybyaddingatraceamountofH2O2.

简介：AbstractBackground:Dysfunction of cerebral autoregulation is one of the pathophysiological mechanisms that causes delayed cerebral ischemia (DCI) after subarachnoid hemorrhage (SAH). Pressure reactivity index (PRx) have been confirmed to reflect the level of cerebral autoregulation and used to derive optimal cerebral perfusion pressure (CPPopt). The goal of this study is to explore the associations between autoregulation, CPPopt, PRx, and DCI.Methods:Continuous intracranial pressure (ICP), arterial blood pressure (ABP), and cerebral perfusion pressure (CPP) signals acquired from 61 aSAH patients were retrospectively analyzed. PRx was calculated and collected by Pneumatic computer system. The CPP at the lowest PRx was determined as the CPPopt. The duration of a hypoperfusion event (dHP) was defined as the cumulative time that the PRx was > 0.3 and the CPP was <CPPopt. The duration of CPP more than 10 mmHg below CPPopt (ΔCPPopt < -10 mmHg) was also used to assess hypoperfusion. The percent of the time of hypoperfusion by dHP and ΔCPPopt < -10 mmHg (%dHP and %ΔCPPopt) were compared between DCI group and control group, utilizing univariate and multivariable logistic regression. It was the clinical prognosis at 3 months after hemorrhage that was assessed with the modified Rankin Scale, and logistic regression and ROC analysis were used for predictive power for unfavorable outcomes (mRs 3-5).Results:Data from 52 patients were included in the final analysis of 61 patients. The mean %dHP in DCI was 29.23% and 10.66% in control. The mean %ΔCPPopt < -10 mmHg was 22.28%, and 5.90% in control. The %dHP (p < 0.001) and the %ΔCPPopt < -10mmHg (p < 0.001) was significantly longer in the DCI group. In multivariate logistic regression model, %ΔCPPopt <-10 mmHg (p < 0.001) and %dHP (p < 0.001) were independent risk factor for predicting DCI, and %ΔCPPopt <-10 mmHg (p = 0.010) and %dHP (p = 0.026) were independent risk factor for predicting unfavorable outcomes.Conclusions:The increase of duration of hypoperfusion events and duration of CPP below CPPopt over 10 mmHg, evaluated as time of lowered CPP, is highly indicative of DCI and unfavorable outcomes.

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简介：Zhundong煤田是床气化被看作了完成它的干净、有效的利用的一个有希望的方法的世界范围、使流体化的最大的未经触动的煤田。这研究的目的是调查物理化学的性质和极其细小的半字符的气化反应，从凳子规模导出使流体化的床gasifier，用是的Zhundong煤燃料。获得的结果如下。与未加工的煤相比，碳和半字符的灰内容在部分气化以后增加，但是他们的灰熔化温度不显示出重要差别。特别地，在煤释放了到气体的feed的76.53%钠在使流体化的床气化以后分阶段执行。半字符的化学作文是仔细与它的粒子有关缩放，对多样的元素的显然不同的性质可归因。半字符展出更高的graphitization度，更高的赌注表面区域，和更富有的中央--并且macropores，哪个在优异气化反应的结果比煤字符。半字符的化学反应被增加的气化温度显著地改进，它在更高的温度建议半字符的气化的必要性。因而，在从使流体化的床gasifiers的半字符的这些碳为气化过程被回收并且再使用，将被认为可行。

简介：ＭＯＬＥＣＵＬＡＲＭＥＣＨＡＮＩＣＡＬＡＮＤＱＵＡＮＴＵＭＣＨＥＭＩＣＡＬＣＡＬＣＵＬＡＴＩＯＮＯＮＡＣＹＬＡＴＩＯＮＲＥＡＣＴＩＶＩＴＹＦＯＲ１－（ＮＩＴＲＯＳＵＢＳＴＩＴＵＴＥＤＡＮＩＬＩＮＯ）－４－ＳＵＢＳＴＩＴＵＴＥＤ－２，６－ＰＩＰＥＲＡＺ...

简介：The2-C,methylenegroupof1-aroyl-1,2-dihydro-3H-naphtho[2,1-b]pyran-3-ones(2)havebeenshowedtopossessasuperiorreactivitytowardsmanyoforganicreagents.Thena-phthopyrones(2)condensedwitharomaticaldehydestogivethe2-arylidinederivatives(3).Bromin-ationof2gave1,2-dibromo(4)or5-bromo(5)derivativesdependingonthereactionconditions.Thebasecatalyzedadditionorcycloadditionofnaphthopyrones(2)to4-methoxybenzalacetophenonegavetheexpectedMichaeladduct(6)orthecyclicadducts(7-9)dependingonthetypeofcatalyticbaseandreactionconditions.Structuresoftheproductshavebeenestablishedbyelementalanalyses,IRand~1HNMRspectroscopicmethods.

简介：PureAl2O3-2SiO2powderswerepreparedbysol-gelandcoprecipitationmethods,andtheiralkaliactivationreactivitieswerecompared.Thealkali-activationreactivityofthepowderpreparedbythesol-gelmethodwashigherthanthatofthepowderpreparedbythecoprecipitationmethod.Thepowderswereinvestigatedby27AIand29Simagic-anglespinningnuclearmagneticresonancespectroscopy（MASNMR）tounderstandtherelationshipbetweentheirstructureandalkali-activationreactivity.The27AlMASNMRdatashowedthatthefive-coordinateAIcontentofthepowderpreparedbythesol-gelmethodwashigherthanthatofthepowderpreparedbycoprecipitation.Thehighercontentoffive-coordinateAlcorrespondedtohigheralkali-activationreactivity.The29SiMASNMRdatashowedthatforthepowderpreparedbythesol-gelmethod,siliconwasreplacedbyaluminumatsecondarycoordinationsitesofthecentralSiatomsduringcalcination.However,forthepowderpreparedbysingle-batchcoprecipitation,themainchangewasfromalowdegreeofpolycondensationtoahighdegreeofpolycondensation.