简介:TheesterificationoflauricacidwithmethanolcouldbeefficientlycatalyzedbyZrOCl2·8H2O,andthisreactionwasstudiedtodevelopagreenmethodforbiodieselproduction.Theinfluencingfactors,suchasamountofcatalyst,reactiontimeandmolarratioofacidtomethanol,wereinvestigated.TheresultsindicatedthattheZrOCl2·8H2Ocatalystshowedhighcatalyticactivity,andgavea97.0%methyllaurateconversionrateunderthefollowingoptimizedconditions,viz.:alauricacid/methanolmolarratioof1:10,acatalystdosageof4%,andareactiondurationof2hatmethanolrefluxingtemperature.Thecatalystcouldbeeasilyrecoveredwhileitsactivitycouldbewellretainedafterthreecycles.TheZrOCl2·8H2Ocatalystalsoexhibitedexcellentcatalyticactivityfortheesterificationofdifferentfreelong-chainfattyacids(includingnonedibleoilswithhighacidvalue)withdifferentshortcarbonchainalcohols.Therefore,theZrOCl2·8H2Ocatalysthasgoodpotentialforthesynthesisofbiodieselfromlow-costfeedstockssuchaswastevegetableoilsandnon-edibleoils.
简介:据岩心、铸体薄片、扫描电镜和常规物性等资料,结合测井解释成果,对鄂尔多斯盆地镇原地区长8油层组砂岩储层特征进行了研究。结果表明:长8油层组砂岩储层曾遭受酸性介质的改造,次生孔隙发育:储集空间以剩余原生粒间孔、粒问溶孔和微裂缝为主,黏土矿物晶间微孔对储层物性也有贡献;储层发育受沉积相、碎屑组分、成岩和构造作用共同影响,其中沉积微相影响储层的空间展布;碎屑组分和粒度与储层物性具有直接关系:成岩作用对储层物性的影响有利有弊,压实和胶结作用可使原生孔隙大部分丧失.而溶蚀作用形成的次生孔隙可大幅度提高储层的孔、渗性,为形成优质储层的关键。
简介:标题化合物C22H29N3O3以简单易得的试剂为原料,在乙醇溶剂中,微波辐射下经两步多组分反应合成得到.其结构通过单晶X射线衍射法确定,晶体属三斜晶系,空间群P-1,相对分子质量Mr=383.48,晶胞参数a=1.14770(12)nm,b=2.0657(2)nm,c=1.00780(12)nm,V=2.1841(4)nm3,Z=4,晶胞密度Dc=1.166mg/m3,吸收系数μ=0.078mm-1,单胞中电子的数目F(000)=824.晶体结构用直接法解出,经全矩阵最小二乘法对原子参数进行修正,最终的偏离因子为R1=0.0709,wR2=0.1405.在晶体结构中新形成的噌啉环为近似于共平面结构,而其中的哒嗪环则为船式构象.
简介:摘要目的观察七氟醚麻醉对腹部手术患者围术期血清白介素-8(IL-8)水平的影响。探讨更适合腹部手术患者的全麻方法。方法选择2011年12月至2013年4月在我院手术的患者80例,随机分为观察组和对照组,各40例。观察组采用七氟醚复合异丙酚、瑞芬太尼麻醉,对照组用异丙酚、瑞芬太尼麻醉。分别于麻醉前(T0),切皮后2h(T1),术后4h(T2),术后24h(T3),术后48h(T4)取两组患者颈内静脉血,分离血清,用EL工SA酶联免疫测定各时间点血清IL-8。结果观察组T2、T3血清IL-8水平较对照组明显降低(P<0.05),而对照组无明显变化。结论腹部手术患者麻醉用药中复合七氟醚麻醉可影响患者血清IL-8水平。
简介:ThegreatSanhe-PingguM8earthquakeoccurredin1679wasthelargestsurfaceruptureeventrecordedinhistoryinthenorthernpartofNorthChinaplain.Thisstudydeterminesthefaultgeometryofthisearthquakebyinvertingseismologicaldataofpresent-daymoderate-smallearthquakesinthefocalarea.Werelocatedthoseearthquakeswiththedouble-differencemethod.Basedontheassumptionthatclusteredsmallearthquakesoftenoccurinthevicinityoffaultplaneoflargeearthquake,andreferringtothemorphologyofthelongaxisoftheisoseismallineobtainedbythepredecessors,weselectedastrip-shapedzonefromtherelocatedearthquakecatalogintheperiodfrom1980to2009toinvertfaultplaneparametersofthisearthquake.Theinversionresultsareasfollows:thestrikeis38.23°,thedipangleis82.54°,theslipangleis-156.08°,thefaultlengthisabout80km,thelower-boundarydepthisabout23kmandtheburieddepthofupperboundaryisabout3km.ThisshowsthattheseismogenicfaultisaNNE-trendingnormaldip-slipfault,southeastwalldownwardandnorthwestwalluplift,withtheright-lateralstrike-slipcomponent.Moreover,thesurfacerupturezone,intensitydistributionoftheearthquakeandseismic-wavevelocityprofileinthefocalareaallverifiedourstudyresult.