简介:摘要目的探讨B超检查在胎儿脐带绕颈临床诊断中的应用价值。方法选择2012年3月-2013年11月来我院进行产检并住院分娩的137例孕产妇作为研究对象,根据产前2周B超检查是否存在脐带绕颈将137例孕产妇分为观察组和对照组,观察两组B超诊断结果准确率、宫内窘迫率及新生儿Apgar评分。结果观察组31例孕妇中,产后临床判断为脐带绕颈28例,B超诊断符合率为90.3%(28/31),对照组106例孕妇中,产后临床判断为脐带绕颈101例,B超诊断符合率为94.4%(101/106);观察组中胎儿宫内窘迫3例,新生儿出生1分钟Apgar评分(7.32±0.27)分,对照组中胎儿宫内窘迫2例,新生儿出生1分钟Apgar评分(5.76±0.31)分,两组间差异有统计学意义(P<0.05)。结论B超诊断胎儿脐带绕颈准确率,能为产科医生密切观察产程及选择正确的分娩方式提供参考。
简介:摘要目的探讨术中B超(IOBUS)在胆总管末端结石诊断中的价值。方法对127例拟诊为胆总管末端结石的患者,实施微创开腹手术,应用术中B超检查胆总管末端,将术中B超结果与术前B超及MRCP检查结果进行对比分析。结果术前B超准确率为32.3%(41/127),术中B超诊断准确率为85.5%(109/127),后者明显高于前者,χ2=22.05,p<0.01;MRCP准确率为89.8%(114/127),与术中B超准确率无显著差别,χ2=0.0597,p>0.05。结论术中B超在胆总管末端结石诊断中准确率高,安全、无创,价格便宜,操作简便,在基层医院可做为MRCP的替代检查。
简介:Neutralbeaminjection(NBI)isrecognizedasoneofthemosteffectivemeansforplasmaheating.A100slongpulseneutralbeamwith30keVbeamenergy,10Abeamcurrentanda100slongpulsemodulatingneutralbeamwith50keVbeamenergy,16AbeamcurrentwereachievedintheEASTneutralbeaminjectoronthetest-stand.ThepreliminaryresultssuggestthatEAST-NBIsysteminitiallypossesstheabilityoflongpulsebeamextraction.
简介:BasedonthesimulationwiththeOcean-AtmosphereCoupledModelCCSMandOceanModelPOPunderthegreenhousegasemissionscenariooftheIPCCSRESA2(IPCC,2001),andontheearthcrustsubsidenceandglaciermeltingdata,therelativesealevelchangeisobtainedalongthecoastofChinainthe21stcentury.UsingtheSRTMelevationdatathesubmergenceofcoastallowlandiscalculatedundertheextremewaterlevelwitha100-yearreturnperiod.Thetotalfloodingareasare98.3×103and104.9×103km2for2050and2080,respectively.Forthethreeregionsmostvulnerabletoextremesealevelrise,i.e.,thecoastofBohaiBay,theYangtzeRiverDeltatogetherwithneighboringJiangsuProvinceandnorthernZhejiangProvince,andthePearlRiverDelta,thefloodedareasare5.0×103,64.1×103and15.3×103km2in2050and5.2×103,67.8×103and17.2×103km2in2080,respectively.
简介:SincePresidentNixonvisitedChinain1972,theicehasbrokeninChina-U.S.relations.In1979,thetwocountriesnormalizedbilateralrelationsbyestablishingdiplomaticrelations.Overthepastthreedecades,bilateralrelationshaveexperiencedcomplicatedandconvolutedchange.Today,China-U.S.relationsareentering
简介:Becomingtheworld’slargestemitterofcarbonmakesChinatheobjectofcriticism;however,peoplemayignorethefactthatwhenChinaexportslow-carbonproducts,thecarbonemissionshavebeenleftinthemeanwhile,formingtheso-called"embodiedcarbon".Usingtheinput-outputmodel,thispaperanalyzesthecarbonemissionintensityandamountofembodiedcarbonofvarioussectorsinChina’sexporttradein2002and2007,andfiltersouthighcarbonemissionsectors.Inaddition,thispaperalsopointsouttheproblemofcarbonemissions’internationaltransferfromdevelopedcountriestoChinathroughtheanalysisofnationalandregionalflowofexportcarbonemissionsandchangingoftheproportionofemissionsforexportsrelativetototalemissions,andexplainsthereasonthatcausedcarbontransfertoChinabyusingthetreadmillofproductiontheory.Basedonthat,thispaperproposessomemeasuresforcarbonreductioninChinafromtheforeigntradeperspective.
简介:TheCOREXprocessisauniqueindustrializedsmeltingreductiontechnologyforiron-makingpresentlyintheworld.Oneofitsstrikingcharacteristicsisitsabilitytodirectlyutilizelumpcoalasitsmainfuel.Therefore,theCOREXprocessuseslittle,ornocokeatall.TherequirementsonlumpcoalfortheCOREXprocessweregiveninthispaper.Inordertoreducethecokeconsumptionandgiveplaytotheadvantagesofdirectlyusinglumpcoal,theappropriateratioofcoketolumpcoalneedstobedetermined.Thispaperalsosummerizedseveraladvancedmethodsofusingpowderedcoalgeneratedbythetransporting,loadingandunloadingoflumpcoal.InordertosolvethelackofcoaltypesforCOREXandobservethecrackinganddevolatilizationactionoflumpcoalinthemelter-gasifier,anexperimentaldeviceandanewmethodwereproposedtotestthecrackinganddevolatilizationcharacteristicsoflumpcoal.Bymeansofthenewmethod,thedevolatilizationandcrackingbehaviorsoflumpcoalcanbeinvestigated,whichishelpfultotheselectionoflumpcoalfortheCOREXprocess.
简介:摘要目的探讨乙肝病毒前S1抗原(Pre-S1Ag)与HBV血清标志物(HBVM)同步检测的临床价值。方法对确诊的380例乙肝病例空腹抽血,采用ELISA法及HAMILTN全自动酶联免疫分析仪同步检测Pre-S1Ag与HBVM(HBsAg、抗-HBs、HBeAg、抗-HBe、抗-HBc),并对结果进行比较分析。统计学处理采用χ2检验。结果统计显示PreS1Ag的检出率HBsAg、HBeAg、HBcAb阳性组(78.8%)明显高于HBsAg、HBeAb、HBcAb阳性组(41.6%),差异有显著性(χ2=21.04,P<0.01);HBsAg、HBeAg阳性组PreS1Ag阳性率(79.3%)明显高于HBsAg、HBcAb阳性组(25.3%),提示HBeAg阳性组中PreS1Ag阳性率明显高于HBeAg阴组,差异有显著性(χ2=21.49,P<0.01);提示PreS1Ag是一个与HBeAg同时存在的较好指标。结论前S1抗原与病毒复制有关,与HBeAg具有一致性;与HBVM同步检测,可减少和避免HBeAg系统发生变异所致的假阴性对临床的误导。