简介:Thesuppressionoftherecombinationofelectronsandholes(e–h)andtheenhancementofthelightabsorptionofsemiconductorsaretwokeypointstowardefficientphotocatalyticdegradation.Here,wereportafew-layerg-C3N4/α-MoO3nanoneedles(flg-C3N4/α-MoO3NNs)all-solid-stateZ-schememechanismphotocatalystsynthesizedviaatypicalhydrothermalmethodinacontrolledmanner.Therecombinationofthephoto-inducede–hpairscouldbeeffectivelyrestrainedbytheZ-schemepassagewaybetweentheflg-C3N4andα-MoO3NNsinthecomposite,whichcouldalsopromiseahighredoxabilitytodegradepollutants.Anditbecamepossibleforthepreparedphotocatalysttoabsorblightinawiderangeofwavelengths.Thedetailedmechanismwasstudiedbyelectronspin-resonancespectroscopy(ESR).Thelow-dimensionalnanostructureofthetwoconstituents(α-MoO3NNswithone-dimensionalstructureandflg-C3N4withtwo-dimensionalstructure)endowedthecompositewithvarietiesofexcellentphysicochemicalproperties,whichfacilitatedthetransferanddiffusionofthephotoelectronsandincreasedthespecificsurfaceareaandtheactivesites.The10wt%flg-C3N4/α-MoO3NNsshowedthebestphotocatalyticperformancetowardRhBdegradation,therateofwhichwas71.86%,~2.6timeshigherthanthatofα-MoO3NNs.
简介:摘要目的:探索黄皮新肉桂酰胺 B对 TNF-a的影响及对 TNF-a蛋白调控是否通过 TLR4/MyD88/NF-ΚB信号通路中对细胞炎症反应的调控。方法: ELISA法检测 TNF-a含量; MTT试验检测黄皮新肉桂酰胺 B和 LPS对 RAW264.7细胞抑制率的影响;对细胞随机分组, WesternBlot法检测分组后 TLR4、 NF-ΚB蛋白表达。结果:黄皮新肉桂酰胺 B、 LPS对细胞生长无明显抑制;黄皮新肉桂酰胺 B使 TNF-a水平降低;与 LPS组比较, LPS+MyD88抑制剂组、 LPS+黄皮新肉桂酰胺 B组、 LPS+黄皮新肉桂酰胺 B+MyD88抑制剂组明显抑制 TNF-a分泌,差异有统计学意义( P<0.05),分别使 TLR4和 NF-ΚB蛋白降低至 74%、 21%, 70%、 27%,44%、 8.5%。
简介:2018年已经过去,如果用一个汉字来描述自己的这一年,可能每个人都有不同答案。如果用一个汉字来形容一个国家的2018,哪个字会夺得'C位'呢?由中国国家语言资源监测与研究中心主办的'汉语盘点2018'评选,选出的中国年度代表字为'奋'。
简介:Variousagriculturalcropresiduesincludingcornstover,corncob,andsorghumstalkwithamoisturecontentof75wt%weresubjectedtoalongpretreatment(12-60h)withsupercriticalCO2(scCO2),atlowtemperature(50-80℃)andapressureof17.5-25.0Mpa.Thesugaryieldsfromtheenzymatichydrolysis(EH)ofthepretreatedsampleswereasmuchasthree-tofourfoldgreaterthanthoseaffordedbytherawmaterials.However,whenpretreatmentwasconductedwithinashorttime(e.g.0.5h),aspreviouslyreportedintheliterature,onlyaslightincreaseintheEHsugaryieldswasobserved.TheproposedscCO2pretreatmentmechanismdemonstratedtheroleofmoistureinthesystem.Wetting,softening,andswellingwereobservedtomainlyaffectthelignocellulosewhenasuitableamountofwaterwasadded.Finally,thesampleswereanalysedbyX-raydiffractionandscanningelectronmicroscopy,beforeandafterpretreatment,toinvestigatethechangesinthemicroscopicstructureofthebiomass.
简介:SiliconoxynitridewasaddedinshapedAl2O3-SiC-Crefractorymaterialtoimprovetheslagresistanceinthispaper.Optimumaddingquantityofsiliconoxynitridepowderwasalsostudied.TheresultsshowthattheslagresistanceofAl2O3-SiC-Cshapedrefractoryisimprovedwhen2%or3%Si2N2Oisadded.AreasonableamountofSi2N2OaddedintoAl2O3-SiC-Cshapedrefractorycanproducesiliconoxideintotheslag,whichcanimprovetheviscosityofslagandpreventtheslagerosionandpenetration.
简介:VisualC#中调用Excel的COM组件 ,要在VisualC#中使用这些非受管代码的COM组件,本文介绍了Excel对象、C#中的受管代码和非受管代码
简介:Anovelgas-phaseelectrocatalyticcellcontainingalow-temperatureprotonexchangemembrane(PEM)wasdevelopedtoelectrochemicallyconvertCO2intoorganiccompounds.TwodifferentCu-basedcathodecatalysts(CuandCu-C)werepreparedbyphysicalvapordepositionmethod(sputtering)andsubsequentlyemployedforthegas-phaseelectroreductionofCO2atdifferenttemperatures(70-90℃).ThepreparedelectrodesCuandCu-CwerecharacterizedbyX-raydiffraction(XRD),X-rayphotoemissionspectroscopy(XPS)andscanningelectronmicroscopy(SEM).Asrevealed,CuispartiallyoxidizedonthesurfaceofthesamplesandtheCuandCu-Ccathodiccatalystswerecomprisedofaporous,continuous,andhomogeneousfilmwithnanocrystallineCuwithagrainsizeof16and8nm,respectively.Theinfluenceoftheappliedcurrentandtemperatureontheelectro-catalyticactivityandselectivityofthesematerialswasinvestigated.Amongthetwoinvestigatedelectrodes,thepureCucatalystfilmshowedthehighestCO2specificelectrocatalyticreductionratesandhigherselectivitytomethanolformationcomparedtotheCu-Celectrode,whichwasattributedtothehigherparticlesizeoftheformerandlowerCuO/Curatio.Theobtainedresultsshowpotentialinterestforthepossibleuseofelectrical「enewableenergyforthetransformationofCO2intovaluableproductsusinglowmetalloadingCubasedelectrodes(0.5mgCucm2)preparedbysputtering.
简介:摘要目的讨论分析在妇科发生腹腔或盆腔内的脏器因急性炎症、创伤、穿孔、破裂、阻塞和其他引起急性腹痛的疾病给予经腹壁B超结合经阴道B超的检查方法的临床意义。方法根据不同的检查和诊疗的方法,将40名在本院住院诊治的急性腹痛症状的病患分为两组。A组选择一般经腹壁的B超,B组给予经腹壁和经阴道B超联合检查。对比两个组检测方案对急性腹痛的诊断率和确定诊断的准确性。结果B组的联合诊断对不同疾病的准确判断率B组宫颈管粘连,异位妊娠,卵巢囊肿破裂等疾病的判断分别为100.00%,95.38%和100.00%,均明显高于A组的63.08%、52.31%、75.38%,具有统计学差异(P<0.05;B组的漏诊、误诊分别为0.00%、3.08%,均明显低于A组的20.00%、12.31%,准确诊断率为96.92%,高于A组(67.69%)。结论腹部与阴道B超联合使用于对在妇科发生腹腔或盆腔内的脏器因各种原因引起急性腹痛的疾病可显著提升对不同疾病的准确判断率,减少漏诊和误诊,可为临床实践判断和治疗活动提供明确的参考价值。