简介:摘要目的支撑喉镜CO2激光手术治疗喉癌的临床效果及对疾病复发率与生存率的影响观察。方法选取我院106例喉癌患者作为研究对象,随机分为观察组和对照组各53例。观察组通过支撑喉镜CO2激光手术进行治疗,对照组通过气管切开喉镜显微镜切除术进行治疗,对比两组患者临床疗效。结果随访6个月后,观察组发音清晰率高于对照组,嘶哑发生率低于对照组,随访1年后,观察组复发率低于对照组,P<0.05;两组患者生存率对比无明显差异,P>0.05。结论支撑喉镜CO2激光手术治疗喉癌具有良好的临床疗效,能有效改善患者的临床症状,降低复发率,保证患者生存率,值得在临床推广应用。
简介:TogaindeepinsightintotheMorphologicaleffectofNixMg1-xOcatalystsonthereactionofCO2reformingwithmethane,wedesignedandfabricatedthreedifferentspatialstructuralNixMg1-xOcatalysts.TheseNixMg1-xOcatalystswithspecificmodelssuchasrod,sheetandsphere,exhibitedvariousactivityandstabilityinCO2reformingreaction.HereinNixMg1-xOnanorodsdisplayedhighercatalyticactivity,inwhichmethaneconversionwasupto72%andCO2conversionwas64%at670°Cwithaspacevelocityof79,200mL/(gcath),comparedwithnanosheetandnanospherecounterparts.Furthermore,bothcatalystsofNixMg1-xOnanorodandnanosheetshowedahighresistancetowardcokedepositionandsinteringofactivesitesintheprocessofCO2reformingofmethane.
简介:Theinterestinthenationallevelsoftheterrestrialcarbonsinkanditsspatialandtemporalvariabil-itywiththeclimateandCO2concentrationshasbeenincreasing.HowtheclimateandtheincreasingatmosphericCO2concentrationsinthelastcenturyaffectthecarbonstorageincontinentalChinawasin-vestigatedinthisstudybyusingtheModifiedSheffeldDynamicGlobalVegetationModel(M-SDGVM).TheestimatesoftheM-SDGVMindicatedthatduringthepast100yearsacombinationofincreasingCO2withhistoricaltemperatureandprecipitationvariabilityincontinentalChinahavecausedthetotalvege-tationcarbonstoragetoincreaseby2.04PgC,with2.07PgCgainedinthevegetationbiomassbut0.03PgClostfromtheorganicsoilcarbonmatter.TheincreasingCO2concentrationinthe20thcenturyisprimarilyresponsiblefortheincreaseofthetotalpotentialvegetationcarbon.Thesefactorialexperimentsshowthattemperaturevariabilityalonedecreasesthetotalcarbonstorageby1.36PgCandprecipitationvariabilityalonecausesalossof1.99PgC.TheeffectoftheincreasingCO2concentrationaloneincreasedthetotalcarbonstorageinthepotentialvegetationofChinaby3.22PgCoverthepast100years.Withthechangingoftheclimate,theCO2fertilizationonChina'secosystemsistheresultoftheenhancednetbiomeproduction(NBP),whichiscausedbyagreaterstimulationofthegrossprimaryproduction(GPP)thanthetotalsoil-vegetationrespiration.OurstudyalsoshowsnotableinterannualanddecadalvariationsinthenetcarbonexchangebetweentheatmosphereandterrestrialecosystemsinChinaduetothehistoricalclimatevariability.
简介:FifteennewabsorptionlinesareobservedwhenstudyingCO2absorptionspectroscopybywavelengthmodulation(WM)techniquewithadistributedfeedbacklaser.TheovertonespectraofCO2around1.31μmandthecorrespondingspectralparameters(i.e.positions,intensities,self-broadeningcoefficients)arepresented.Theintensityoftheweakestlinedetectedis2.25163×10^-27cm^-1/(molecule·cm^-2)atthepressureof5Tort,withacorrespondingabsorptionof3.88×10^-8.
简介:摘要目的观察乌拉地尔对腹腔镜co2气腹导致的高血压的降压作用的临床效果。方法60例全麻下腹腔镜手术病人随机分为对照组(A组,n=30)和乌拉地尔组(B组,n=30),B组于气腹前经静脉推注乌拉地尔0.4mg/kg。记录A组与B组患者气腹前(T1)、气腹后1min(T2)、3min(T3)、5min(T4)、10min(T5)、20min(T6)、30min(T7)及放气后10min(T8)的SBP、DBP、HR的改变。结果A组气腹期间相应时点的SBP、DBP、HR与T1相比明显升高(P<0.01);而B组以上指标相应时点与T1相比无明显改变。结论乌拉地尔能很好地抑制和降低CO2气腹引起的血压变化。
简介:摘要:二氧化碳气体保护焊(以下简称CO2焊)是利用CO2气体作为保护气体的一种熔化极电弧焊方法。本文总结了多年来在实训教学过程中的经验,以厚度12mm板材的CO2焊立向上焊为例(单面焊双面成形),简明扼要地分析了CO2焊打底时产生穿丝的主要原因及防止措施,大大提高了实训教学质量。