简介:摘要目的对x线数字拍片遮线器在临床影像学观察中的应用意义进行探索,以期为临床实践提供参考。方法选取我院于2014年6月至2015年6月间收治的接受X线数字拍片的150位患者作为研究对象,此外,选取150位接受传统方法拍片的患者作为对比,分别分为观察组和对照组,两组患者的拍摄部位一直,采用剂量测定软件进行检测,同时对患者身体上剂量的照射面积乘积值进行对比分析,比较两组拍片方法的应用效果。结果通过对研究数据的归纳和统计,我们不难发现,观察组与对照组在总的辐射剂量方面存在显著性差异(P<0.05),观察组患者的辐射剂量相对较少。吻合式遮蔽器摘除后辐射DAP百分比降低程度明显比传统方法较大,二者具有显著性差异(P<0.05),具有统计学意义。吻合式遮线器显著降低了原发射线的散量,提高了影像的辨识度。结论x线数字拍片遮线器在临床影像学观察中具有非常显著的应用价值,较传统技术的遮挡更加科学,显著提高了影响质量,值得在临床实践中大力推广应用。
简介:Inagasturbineenginecombustor,highlyswirlingcombustionisusuallyadoptedtostabilizeflameandreducepollutantemissions.Swirlcup,asanairblastatomizer,iswidelyusedtoprovideauniformpresentationoffueldropletstothecombustordome.Thispaperinvestigatedtheeffectofsecondaryswirlerontheflowfielddownstreamoftheswirlcupusingparticleimagevelocimetry(PIV).Threeswirlcups’non-reactingflowfieldwerestudied:caseA,BandCwithsecondaryswirlervaneangle53°,60°and68°respectively.Detailedmeanandtransientvelocitiesandvorticityinthecenterplanewereobtained.FromthePIVresults,asharpcontrastflowfieldwasobtainedforcaseAtoothertwocasesduetothelowersecondaryswirlingintensity.TherecirculationzoneiscollapsedindisorderforthecaseA.Ignitiontestsofthethreecupswerecompletedinasinglecupcombustor.Ingeneral,theignitionperformanceincreaseswiththeincreasingofthesecondaryswirlingintensity.ForcaseA,theignitionperformanceisveryunstableandhasmuchrandomnessandthereisnoclearleanignitionboundarycanbegenerated.Thisworkcanfurtherunderstandtheswirlbehaviorandignitionmechanism.
简介:Projectionsfor20yearsofeconomicgrowthandchangeinthestructureoftheThaieconomyweremadefor180sectorsusingacomputablegeneralequilibrium(CGE)modeltocomparethefollowingfourscenarios:(1)standardgrowthwithinfinitesupplyoffactors,(2)finitelandsupply,(3)fixeduseofagriculturalchemicals,and(4)combinedfinitelandsupplywithfixeduseofagriculturalchemicals.Thecomputableprojectionssuggestthattheeconomiccostofhypotheticalenvironmentalcontrolinagricultureissmallandfurtherweakenedbyurbanization.Thecomputedstructuraldevelopmentpointstoefficiencyimprovementsspecifictosectorstoreturntheeconomytobalancedgrowth.
简介:ComparativeanalysisofChina’shumanrightswhitepapersprovidesavaluableperspectiveonchangesintheofficialhumanrightsdiscourse.Intermsoftheirstructures,thewhitepaperscanbedividedintothreetypes:themixedmodel,thefive-in-onemodelandtherights-listmodel.Therights-listmodelhasaconsistentstyle,standardterminology,andanarrangementofrightsinlinewithChina’sreality.Intermsofcontents,therighttosubsistencehasbeengraduallyreducedandtherighttodevelopmentisincreasing.Inthe2013whitepaper,therewasawholechapteronsocialsecurityrights,whichhighlightsChina’ssocialdevelopmentandthepriorityplacedonthepeople’swellbeing.TherighttodevelopmentandsocialsecuritywillbecomeanewfocusofhumanrightsdiscourseinChina.