简介:摘要:随着新能源技术的不断发展,越来越多的建筑采暖不再局限于单一热源,而是采用多热源耦合的形式,这样不但能够提高供暖系统应对各种复杂室外工况的能力,还能够在一定程度地降低运行成本。本文以吉林某项目为例,研究严寒地区复合式供暖系统,提出土壤源热泵耦合空气源热泵和土壤源热泵耦合蓄热式电锅炉两种热源形式,并与纯电采暖系统方案进行对比,发现在考虑初投资的情况下,采用土壤源热泵耦合空气源热泵的热源形式从整体来看依然具有一定的应用优势。
简介:AstablewavelengthoperationHo:YAGlaserdual-pumpedbytwoorthogonallypolarizedTm:YLFlasersisreported.Underthecwoperationmode,alaseroutputpowerof24Wismeasured.Thecorrespondingopticalopticalconversionefficiencyis44.75%andtheslopeefficiencyis50.12%.UndertheQ-switchedoperationmode,theoutputmaximumaveragepoweris22.8Watthere-frequencyof6kHz.Thecorrespondingoptical-opticalconversionefficiencyandslopeefficiencyare42.64%and48.01%,respectively.Theoutputcentralwavelengthis2090.73nm,thelinewidthis0.40nm,andthebeamqualityisM~2<1.6.Moreover,theshiftoftheoutputcentralwavelengthislessthan0.01nm,andthelinewidthshiftisalsolessthan0.01nm.
简介:AIMToinvestigatetheinfluenceofprotonpumpinhibitors(PPIs)exposureonthediagnosisofHelicobacterpylori(H.pylori)gastritisandintestinalmetaplasia.METHODS:ChronicPPIuseisassociatedwithmaskingofH.pyloriinfection.PatientswithH.pyloriinfectionarepredisposedtogastricandduodenalulcers,andlong-terminfectionwiththisorganismhasbeenassociatedwithgastricmucosalatrophyandseriouslong-termcomplications,suchasgastriclymphomaandadenocarcinoma.ThreehundredpatientsdiagnosedwithgastritisbetweenJanuary2008andApril2010wereincludedinourstudy.Thecomputerizedmedicaldatabaseofthesepatientswasreviewedretrospectivelyinordertoassesswhetherthetypeofgastritisdiagnosed(H.pylorivsnon-H.pylorigastritis)isinfluencedbyPPIexposure.H.pyloridensitywasgradedaslow,ifcorrespondingtomilddensityfollowingtheUpdatedSydneySystem,orhigh,ifcorrespondingtomoderateorseveredensitiesintheUpdatedSydneySystem.RESULTS:Patientswereequallydistributedbetweenmalesandfemaleswithamedianageatthetimeofdiagnosisof50yearsold(range:20-87).ThehistologicaltypesofgastritiswereclassifiedasH.pylorigastritis(n=156,52%)andnon-H.pylorigastritis(n=144,48%).Allpatientswithnon-H.pylorigastritishadinactivechronicgastritis.PatientswithnopreviousPPIexposureweremorelikelytobediagnosedwithH.pylorigastritisthanthosewithpreviousPPIexposure(71%vs34.2%,P〈0.001).Intestinalmetaplasiawasmorelikelytobedetectedinthelatterpatients(1.4%vs6.5%,P=0.023).MultivariateanalysishasalsodemonstratedthatinthepresenceofpreviousPPIexposure(OR=0.217,95%CI:0.123-0.385),GERD(OR=0.317,95%CI:0.132-0.763,P=0.01),alcoholintake(OR=0.396,95%CI:0.195-0.804,P=0.01),thedetectionofH.pyloriwaslesslikely.ChronicuseofPPIsmaymaskH.pyloriinfectionspromotingthediagnosisofnon-H.pylorigastritisandleadstoasi
简介:Understandingtheradiationmodelofaflashlampisessentialforthereflectordesignofalaseramplifier.Reflectordesignofteninvolvesseveralsimplifyingassumptions,likeapointorLambertiansource;eitheroftheseassumptionsmayleadtosignificanterrorsintheoutputdistribution.Inpractice,sourcenon-idealitiesusuallyresultinsacrificingtheamplifier’sgaincoefficient.Weproposeanoveltesttechniqueforattainingthexenonflashlampabsolutespectralintensityatvariousanglesofview,andthenaccuratelypredictradiationdistributionsandgeneratethereflectorshape.Itisshownthatduetotheabsorptionofemittedradiationbythelampitself,thebehavioroftheradiationmodelatvariouswavelengthsisdifferent.Numericalresultsofxenonplasmaabsorptioncoefficientwerecomparedwiththemeasureddata.Areasonableagreementwasobtainedfortheabsorptioncoefficientparameters.Thus,thisworkprovidesausefulanalyticaltoolfortheengineeringdesignoflaseramplifierreflectorsusingxenonflashlampsaspumps.
简介:WITElectronicFuelSystemCo.,Ltd.hasdevelopedanewfuelinjector,theElectronicIn-linePump(EIP)system,designedtomeetChina’sdieselengineemissionandfueleconomyregulations.ItcanbeusedonmarinedieselenginesandcommercialvehicleenginesthroughdifferentEIPsystems.AnumericalmodeloftheEIPsystemwasbuiltintheAMESimenvironmentforthepurposeofcreatingadesigntoolforengineapplicationandsystemoptimization.Themodelwasusedtopredictkeyinjectioncharacteristicsunderdifferentoperatingconditions,suchasinjectionpressure,injectionrate,andinjectionduration.Tovalidatethesepredictions,experimentaltestswereconductedundertheconditionsthatweremodeled.Theresultswerequiteencouragingandinagreementwithmodelpredictions.AdditionalexperimentswereconductedtostudytheinjectioncharacteristicsoftheEIPsystem.Theseresultsshowthatinjectionpressureandinjectionquantityareinsensitivetoinjectiontimingvariations,thisisduetothedesignoftheconstantvelocitycamprofile.Finally,injectionquantityandpressurevs.pulsewidthatdifferentcamspeedsarepresented,animportantinjectioncharacteristicforEIPsystemcalibration.
简介:摘要结合CRC+AC复合式沥青路面在实际工程中应用的情况,分析了其在特定工程中应用的技术优势、社会效益和经济效益。对CRC面层及AC面层的设计要点进行了总结,并对层间粘结,反射裂缝的控制及路面层间水的排放等问题提出了相关建议。
简介:摘要目的探讨复合式小梁切除术治疗青光眼的临床疗效。方法经本院伦理委员会批准,选取本院2017年2月~2018年2月收治的青光眼患者78例,随机分成两组,每组39例,其中对照组采用常规护理,观察组采用亲情护理,比较两组患者临床疗效。结果观察组总有效率占比为97.44%;对照组总有效率占比为76.92%,两组患者对比观察组更优;观察组视力不变、视力提升、视力降低等视力改善情况显著优于对照组;观察组临床疗效显著优于对照组,两组患者各项临床治疗对比观察组更优,差异有统计学价值(P<0.05)。结论在青光眼治疗中,复合式小梁切除术治疗效果极佳,有良好的应用价值。
简介:摘要目的研究分析表麻下复合式小梁切除治疗近绝对期青光眼的护理。方法分析我院随机抽取的2011年05月至2012年07月的90例患有近绝对期青光眼的患者,随机分成两组,实验组与对照组,平均每组45例患者,对实验组进行表麻下复合式小梁切除治疗的全面护理,对对照组进行常规的护理,在对两组患者进行治疗护理后,观察两组患者的护理效果,并进行对比研究。结果在对两组患者进行护理后,实验组中护理效果显效的有32例,占71.11%,有效的有10例,占22.22%,无效的有3例,占6.67%,总有效率为93.33%,其中有33例视力提高,视野扩大的有8例,实验组的患者眼压均有显著的降低。对照组中护理效果显效的有21例,占46.67%,有效的有13例,占28.89%,无效的有11例,占24.44%,总有效率为75.56%,其中有15例视力提高,视野扩大的有6例,对照组的患者眼压变化不明显。实验组的护理效果明显优于对照组。结论表麻下复合式小梁切除治疗近绝对期青光眼的护理比较全面,不论术前、术中以及术后都注重对患者进行全面的护理,考虑到各方面的护理内容,有利于提高近绝对期青光眼患者的手术成功率,护理效果较好,具有一定的临床意义。
简介:摘要目的探讨复合式与传统小梁切除术治疗青光眼的临床效果,并对其进行评价。方法选取我院于2012年12月至2014年12月收治的40例青光眼患者(48眼),按照患者住院时间的先后将其分成实验组和对照组,对照组采用传统小梁切除术进行治疗,实验组使用复合式小梁切除术进行治疗,采用统计分析软件对两组患者的治疗效果进行对比。结果通过对两组患者施以不同的治疗方法,观察两组患者的治疗效果发现,实验组的手术成功率为90.0%,明显高于对照组的55.0%,且实验组患者术后浅前房发生率以及术后并发症发生率明显低于对照组,差异明显,有统计学意义(P<0.05);此外,两组患者术后半年和1年的眼压数据对比差异明显,有统计学意义(P<0.05)。结论通过研究发现,使用复合式小梁切术治疗青光眼疾病能够有效的提高其手术的成功率,减少患者术后并发症的发生,同时能够保持患者眼压的稳定,其临床价值显著,值得推广应用。