简介:CO2methanationhasbeenahottopicbecauseofitsimportantapplicationinthespacecraftandpotentialutilizationofcarbondioxide.Nickelcatalystisactiveforthisreaction.However,itsactivitystillneedstobeimproved.Dielectricbarrierdischarge(DBD)plasma,initiatedatambientconditionandoperatedat~150°C,hasbeenemployedinthisworkfordecompositionofnickelprecursortoprepareNi/MgAl2O4.Theplasmadecompositionresultsinhighdispersion,uniquestructure,enhancedreducibilityofNiparticlesandpromotedcatalyst-supportinteraction.AnimprovedactivityofCO2methanationwithahigheryieldofmethanehasbeenachievedovertheplasmadecomposedcatalyst,comparedtothecatalystpreparedthermally.Forexample,themethaneyieldoftheplasmapreparedcatalystis71.8%at300°Cbutitis62.9%overthethermalpreparedcatalyst.ThecatalystcharacterizationconfirmedthatCO2methanationovertheDBDplasmapreparedcatalystfollowspathwayofCOmethanation.
简介:Accuratelymeasuringthedifferentialmolecularabsorptioncrosssectionisthekeytoobtainingahigh-precisionconcentrationofatmospherictracegasesinadifferentialabsorptionlidar(DIAL)system.However,theCO2absorptionlineismeticulousat1.6μm,easilytranslatingandbroadeningbecauseofthechangeoftemperatureandpressure.Hence,measuringtheverticalprofileofatmospherictemperatureandpressuretocalculatetheverticalprofileoftheCO2weightparameterisnecessary.Ingeneral,measuringatmospherictemperatureandpressurehasacertainamountofuncertainty.Therefore,thisstudyproposestheconceptofabalancedon-linewavelength,wherethedifferentialmolecularabsorptioncrosssectionislargerandtheCO2weightparameterisinsensitivetotheuncertaintyofatmospherictemperatureandpressure.Inthisstudy,weanalyzedtheinfluenceofuncertaintyontheCO2weightparameterateverypreselectedwavelength,aswellasdeterminedanappropriatewavelengthnearoneoftheabsorptionpeaks.Ourresultshowsthat1572.023nmshouldbeoneoftheappropriatebalancedonlinewavelengths.ThemeasurementerrorsofthemixingratioofCO2moleculeinthiswavelengthareonly0.23%and0.25%andarecausedby1Ktemperatureerrorand1hPapressureerror,respectively.Thisachievementofabalancedon-linewavelengthwillnotonlydepresstherequirementofthelaser’sfrequencystabilizationbutalsothedemandformeasurementprecisionoftheatmospherictemperatureandpressureprofile.Furthermore,thisstudycanachievetheexactmeasurementoftheverticalprofileofatmosphericCO2basedonanindependentdifferentialabsorptionlaser.
简介:摘要目的对CO2激光在早期声门型喉癌治疗中的应用进行临床分析和评价。方法对2011年12月-2014年2月在我院耳鼻喉科行CO2激光治疗的60例早期声门型喉癌患者的临床资料进行总结和分析。结果术后8例复发,复发率为13.3%(8/60)。其中,T1a病变3例,复发率为11.5%(3/26),T1b病变3例,复发率为20.0%(3/15),T2病变2例,复发率为20.0%(2/10),组间比较差异无统计学意义(χ2=0.180,P>0.05);21例患者肿瘤浸润至前联合,有7例复发,复发率为33.3%(7/21);39例患者肿瘤未浸润至前联合,有2例复发,复发率为5.1%(2/39),两组间差异有统计学意义(χ2=9.003,P<0.05)。结论CO2激光手术治疗早期声门型喉癌疗效安全可靠,对发音功能保留好,值得在临床推广应用。
简介:WhenaccountingtheCO2emissionsresponsibilityoftheelectricitysectorattheprovinciallevelinChina,itisofgreatsignificancetoconsiderthescopeofbothproducers’andtheconsumers’responsibility,sincethiswillpromotefairnessindefiningemissionresponsibilityandenhancecooperationinemissionreductionamongprovinces.Thispaperproposesanewmethodforcalculatingcarbonemissionsfromthepowersectorattheprovinciallevelbasedonthesharedresponsibilityprincipleandtakingintoaccountinterregionalpowerexchange.Thismethodcannotonlybeusedtoaccounttheemissionresponsibilitysharedbyboththeelectricityproductionsideandtheconsumptionside,butitisalsoapplicableforcalculatingthecorrespondingemissionresponsibilityundertakenbythoseprovinceswithnetelectricityoutflowandinflow.ThismethodhasbeenusedtoaccountforthecarbonemissionsresponsibilitiesofthepowersectorattheprovinciallevelinChinasince2011.Theempiricalresultsindicatethatcomparedwiththeproduction-basedaccountingmethod,thecarbonemissionsofmajorpower-generationprovincesinChinacalculatedbythesharedresponsibilityaccountingmethodarereducedbyatleast10%,butthoseofotherpower-consumptionprovincesareincreasedby20%ormore.Secondly,basedontheprincipleofsharedresponsibilityaccounting,InnerMongoliahasthehighestcarbonemissionsfromthepowersectorwhileHainanhasthelowest.Thirdly,fourprovinces,includingInnerMongolia,Shanxi,HubeiandAnhui,havethehighestcarbonemissionsfromnetelectricityoutflow-14milliontin2011,accountingfor74.42%oftotalcarbonemissionsfromnetelectricityoutflowinChina.Sixprovinces,includingHebei,Beijing,Guangdong,Liaoning,Shandong,andJiangsu,havethehighestcarbonemissionsfromnetelectricityinflow-11milliontin2011,accountingfor71.44%oftotalcarbonemissionsfromnetelectricityinflowinChina.Lastly,thispaperhasestimatedtheemissionfactorsofelectricity
简介:摘要目的研究分析CO2激光治疗睑黄瘤的临床效果。方法选取我院在2013年1月至2015年1月收治的82例睑黄瘤患者的临床资料,按照随机分组的方式,将患者分为治疗组和对照组,治疗组41例患者采用CO2激光治疗;对照组41例患者采用冷冻治疗,对治疗结果进行统计分析,两组患者均治疗两个疗程,对比两组患者治疗效果。结果治疗组总有效率为95.1%;对照组总有效率为78.0%,两组患者治疗有效率对比有统计学意义(P<0.05)。治疗组41例患者中,一次治愈者31例,两次治愈者7例,三次治愈者1例,三次以上治愈者2例;对照组41例患者中,一次治愈者19例,两次治愈者11例,三次治愈者9例,三次以上治愈者2例,两组患者治疗次数对比具有统计学意义。结论CO2激光治疗睑黄瘤具有安全、快速的特征,与传统治疗方式相比,具有很多优势,有助于提高患者的生活水平和生活质量,值得临床推广。
简介:Aseriesofamine-basedadsorbentsweresynthesizedusingsiliceousMCM-41individuallyimpregnatedwithfourdifferentamines(ethylenediamine(EDA),diethylenetriamine(DETA),tetraethylenepentamine(TEPA)andpentaethylenehexamine(PEHA))tostudytheeffectofaminechainlengthandloadingweightontheirCO2adsorptionperformancesindetail.TheadsorbentswerecharacterizedbyFT-IR,elementalanalysis,andthermo-gravimetricanalysistoconfirmtheirstructureproperties.Thermo-gravimetricanalysiswasalsousedtoevaluatetheCO2adsorptionperformanceofadsorbents.Longerchainamine-basedmaterialscanachievehigheramineloadingsandshowbetterthermalstability.TheCO2adsorptioncapacitiesatdifferenttemperaturesindicatethattheCO2adsorptionisthermodynamicallycontrolledoverEDAMCM41andDETA-MCM41,whiletheadsorptionoverTEPA-MCM41andPEHA-MCM41isunderkineticcontrolatlowtemperature.ThechainlengthofaminesaffectstheCO2adsorptionperformanceandtheadsorptionmechanismsignificantly.TheresultsalsoindicatethatCO2adsorptioncapacitycanbeenhanceddespiteofhighoperationtemperatures,ifappropriateamines(TEPAandPEHA)areapplied.However,adsorbentswithshortchainamineexhibithigheradsorptionanddesorptionratesduetothecollaborativeeffectofrapidreactionmechanismsofprimaryaminesandlessdiffusionresistanceofshorterchainlengthamines.
简介:Thispaperreportsonthelongevityofglycerol-dry(CO2)reformingoverthelanthanum(La)promotedNi/Al2O3catalysts.TheXRDresultsshowedthattheNiparticlewaswell-dispersedinthepresenceofLapromoter.Inaddition,viatheNH3-TPDanalysis,itwasfoundthattheLapromoterhasreducedtheacidityofNicatalystwhichmayhaveexplainedthemitigationofcarbonlaydown.Itwasdeterminedthatthe3.0wt%La-promotedNi/Al2O3catalystpossessedthelargestBETspecificsurfaceareaof97m2g-1.Consequently,ityieldedthebestcatalyticlongevityperformancewithconversionattainedmorethan90%,evenafter72hofreactionduration.Significantly,itcanbeconfirmedthatthepresenceofCO2duringtheglyceroldryreformingwasessentialinreducingcarbondeposition,mostlikelyviagasificationpathway.Thishasensuredastabilityofcatalyticactivityforalongreactionperiod(72h).
简介:目的现场使用CO2诱蚊器与紫外光诱蚊器采集成蚊,对比2种捕蚊器的捕蚊效果。方法依据病媒生物密度检测国家标准(GB/T23797-2009),于2014年8-9月以平均每周2次,连续2个月,在广州市蚊虫活动密集场所同时采取CO2诱蚊器与紫外光诱蚊器诱捕蚊虫。结果2种方法共捕获成蚊3282只,其中CO2捕蚊器捕获成蚊1730只,紫外光诱蚊器捕获成蚊1552只;CO2捕蚊器捕获的成蚊平均密度13.11只/(灯·h),白纹伊蚊为10.64只/(灯·h),紫外光诱蚊器成蚊平均密度11.76只/(灯·h),白纹伊蚊为6.74只/(灯·h)。结论CO2诱蚊器对白纹伊蚊诱捕效果优于紫外光诱蚊器,可用于日昼活动蚊种如白纹伊蚊的监测;紫外光诱蚊器对库蚊属(如致倦库蚊)、按蚊属(如微小按蚊)效果较好,对白昼活动的白纹伊蚊效果一般,适用于库蚊属、按蚊属的监测或作定点长期捕蚊灭蚊使用。
简介:CO2地质封存四维地震监测的主要目标是监测地质封存的安全性和CO2驱油效果.注入CO2过程中,储层中流体饱和度和储层压力变化导致储层弹性参数及地震响应发生相应变化.从理论上讲,储层开发的基本地质条件是不变的,所以两次四维地震属性相减得到的成像显示,消去了油气藏静态性质(如构造、岩性等),得到的是油气藏的流体动态成像(如压力、饱和度等).本文采用的加拿大Weyburn油田CO2地质封存项目四维地震数据进行分析和研究,两次三维勘探数据采集时间分别是1999年(Baseline)和2002年(Monitor),CO2封存量为280×104t.首先,以测井资料为基础,通过Gassmann方程和人工合成地震记录,计算替换前后其速度和振幅等属性的变化,以此约束实际地震属性的筛选;然后,在对两次观测的四维地震数据进行四维地震匹配处理的基础上,进行两次观测地震数据的地震属性筛选与对比分析,利用两次地震属性的差异,识别注入CO2后储层内流体的分布特征;最后,以盖层重复性为指标,标定储层,提取储层的不同属性,同时结合人工合成地震记录的结果,得到一个能更好表现其流体变化的属性.
简介:为研究鸭梨可溶性固形物(SSC)等内在品质对其组织褐变发生的影响,进而为鸭梨组织褐变采前防控技术提供理论依据,利用K—BA100R型无损水果糖度检测仪,按SSC高低对鸭梨进行分级,贮于0℃环境中,分别采用1%02+10%C02浓度的气体进行诱导褐变处理15d和30d,分析鸭梨果实采后品质与其组织褐变的关系。结果表明,诱导处理30d。鸭梨果皮和果肉褐变指数与SSC分别呈极显著(R=0.999,R=0.992)正相关,与果实单果重呈显著(R:0.965,R=0.959)正相关,与可滴定酸(TA)含量呈显著负相关(R=-0.958,R=-0.966)。随着诱导时间的延长,果实组织褐变程度越重,TA和VC含量下降明显,且鸭梨果皮、果肉和果心组织的细胞膜透性增大。同时,在鸭梨果皮组织中,N、Ca和B元素的含量越高,则果皮无褐变或褐变程度较轻;在果肉和果心组织中,无褐变或褐变相对较轻的果实,其K和B元素含量较高:褐变程度较重的果实.其组织中的Ca含量较低。表明鸭梨果实的TA与VC含量及K、B、Ca等元素含量与其组织褐变关系密切,提高鸭梨果实的内在品质可在一定程度上减少褐变的发生.而SSC含量与高CO2伤害型黑心病的发生程度无明显规律。