学科分类
/ 11
211 个结果
  • 简介:AbstractBackground:Normal tension glaucoma (NTG) is a less pressure-dependent type of glaucoma with characteristic optic neuropathy. Recently, the biomechanical mechanism has been thought to account for glaucomatous optic neuropathy to some degree. We intended to compare dynamic corneal response parameters (DCRs) among patients with primary open-angle glaucoma with normal tension or hypertension and controls. The correlations between DCRs and known risk factors for glaucoma were also analyzed.Methods:In this cross-sectional study, 49 NTG subjects, 45 hypertension glaucoma (HTG) subjects, and 50 control subjects were enrolled. We compared the differences in DCRs using corneal visualization Scheimpflug technology among the NTG, HTG, and control groups. We also analyzed the correlations between DCRs and known risk factors for glaucoma (eg, central corneal thickness [CCT], intraocular pressure [IOP], etc).Results:The maximum inverse concave radius (NTG: 0.18 [0.17, 0.20] mm-1; control: 0.17 [0.16, 0.18] mm-1; P= 0.033), deformation amplitude ratio of 2 mm (DAR 2 mm, NTG: 4.87 [4.33, 5.39]; control: 4.37 [4.07, 4.88]; P < 0.001), and DAR 1 mm (NTG: 1.62 [1.58, 1.65]; control: 1.58 [1.54, 1.61]; P < 0.001) were significantly higher in NTG than in the controls. The integrated radius (IR, NTG: 8.40 ± 1.07 mm-1; HTG: 7.64 ± 1.31 mm-1; P = 0.026) and DAR 2 mm (NTG: 4.87 [4.33, 5.39]; HTG: 4.44 [4.12, 5.02]; P < 0.007) were significantly higher, whereas the stiffness parameter at the first applanation (SP-A1, NTG: 91.23 [77.45, 107.45]; HTG: 102.36 [85.77, 125.12]; P = 0.007) was lower in NTG than in HTG. There were no significant differences in the DCRs between HTG and control groups (P > 0.05). In the univariate and multivariate analyses, some of the DCRs, such as IR, were negatively correlated with CCT and IOP, whereas SP-A1 was positively correlated with CCT and IOP.Conclusions:The cornea was more deformable in NTG than in HTG or controls. There were no significant differences in corneal deformability between HTG and controls. The cornea was more deformable with the thinner cornea and lower IOP.

  • 标签: Corneal biomechanics Primary open-angle glaucoma Normal tension glaucoma Hypertensive glaucoma
  • 简介:Bothofstraightandincliningpoplarclone107treewereselectedforstudyingmaterialsinthispaper.Theoptimalpulpingconditionswasestablishedbyorthogonalexperimentaldesignbothfornormalwoodandtensionwood,andthequalityofpulpingandpaper-makingbetweennormalwoodandtensionwoodwascomparedwitheachother.Finally,potentialapplicationforimprovingpaperqualityoftensionwoodthroughincreasingbeatingrevolutionswasdiscussed.Theresultshowedthattheoptimalcookingconditionfornormalwoodwasalkaliconcentration15%,thehighesttemperature164℃,timeathighesttemperature75min,andfortensionwooditwasalkaliconcentration13%,thehighesttemperature160℃,timeathighesttemperature40min.Pathcoefficientofeffectofalkaliconcentrationbothonpulpyieldandkappavaluewassignificantatdifferentlevels.Bycomparisonbetweenaverageresultofnormalwoodandtensionwoodinqualityofpulpingandpaper-making,itwasfoundthattensionwoodhadhigherpulpingyieldandlowerkappavaluethannormalwood.Furthermore,forallmechanicalpropertiesofpaper,normalwoodholdhighervaluethantensionwood,andevenneartwotimesthantensionwood,suchasburstindexandtensileindex.However,differenceoftearindexwasquitenarrow.ResultofonewayANOVAshowedthatdifferenceofburstindexandtearindexbetweennormalwoodandtensionwoodwassignificantatthe0.001level,oftearindexwassignificantatthe0.05level.Basedonobservationofcrosssurfaceofpaper,itwasassumedthatcontributionofgelatinouslayertorigidityofsinglefiberhadhamperedcollapseandcompressionoffiberduringpaperformation,whichisessentialforexertingcombinationbetweenfibersinpaper.So,mechanicalpropertiesoftensionwoodpaperweredecreasedaccordingly.However,owingtohighcellulosecontentofgelatinouslayer,tensionwoodwaseasiertopulpingthannormalwood.Mechanicalpropertiesoftensionwoodpapercouldbeimprovedbyincreasingbeatingrevolutions,

  • 标签: POPLAR clone 107 tension WOOD NORMAL
  • 简介:在这个工作,一条新途径为与紧张构造花键被建议。基本想法在分布理论的使用,它允许我们定义紧张花键在最小化一些精力的合适的Hilbert空格功能。花键的古典直角的条件和描述以一个微分操作符的一个基本解决方案被提供。紧张花键的一个明确的代表被给。紧张花键能被解决一个线性系统计算。一些数字例子被给说明这条途径。

  • 标签:
  • 简介:Thenormallyfunctioningheartprovidessufficientoxygenatedbloodcontainingnutrients,metatolitesandhomlonestomeetmoment-by-momentmetabolicneedsandtopresen,eaeonstantinternalmilieu.Itstwoessentialcharacteristicsarecontractilityandrhythmieity.Intheregulationofthese,thenervoussystemandneurohumoraleffectsmodulaterelationshipsbetweenvenonsreturn,outflowresistance,frequencyofcontractionandinotropicstate;therearealsointrinsiccarthacautoregulatotymeohanisms.

  • 标签: 心脏周期 血容量 生理功能 生理特征 收缩性 节律性
  • 简介:矩阵A∈M如果有积极明确的Hermite矩阵H,n(C)被称为概括正常以便哈是正常的。在这篇论文,这些矩阵被调查,他们在一致的意义的正规形式,invariants和相对性质被获得。

  • 标签: 线性矩阵 矩阵论 同余方程 不变量 语音典型
  • 简介:AIM:ToobtaininformationontheprevailingpracticepatternsofglaucomaspecialistsinIndia.METHODS:GlaucomaspecialistsattendingtheAnnualConferenceoftheGlaucomaSocietyofIndia(GSI)weresurveyed.Thissurvey,conductedin2013,wasbasedonaninteractiveaudienceresponsesystem.RESULTS:Theinformationwasobtainedfrom146glaucomaspecialists.Approximatelyhalf(n=83;57%)had≥10yofexperienceinmanagingglaucomaandwereininstitutionalpractice(n=74,51%).Goldmannapplanationtonometrywaspreferredby103(72%)specialistswhilstn=25(17.4%)usednon-contacttonometer.Indentationgonioscopywasfavouredbytwo-thirds(n=90,66%)whereasstereoscopicopticdiscexaminationandvisualfieldsusingHumphreyperimeterwasperformedbyamajorityofthespecialistssurveyed(n=115,86%andn=114;83%respectively).Nearlythreequarterspecialists(n=96;72%)preferredopticalcoherencetomographyforimaging.Theprimarychoicefortreatmentofangleclosurediseaseandprimaryopenangleglaucomawaslaser(iridotomy,n=117;93%)andmedicalmanagement(prostaglandinanalogue,n=104;78%),respectively.Approximatelyonlyathirdofthespecialistssurveyed(n=37;28%)wereperformingbothtrabeculectomyandimplantationofaglaucomadrainagedeviceandabouthalf(n=64;47%)werenotoperatingoncongenitalglaucomaatall.CONCLUSION:Thissurveyhasfoundconformancewithpreferredpracticepatternsinseveralareasofdiagnosisandmanagementofglaucoma,buttherewasdiversityinafewareas.TheinformationisasignificantsteptowardsimprovementofglaucomacareinIndia,includingplanningforfuturestrategies.

  • 标签:
  • 简介:AIM:Toevaluatewhetherthelevelofthrombospondin-1(TSP-1)inaqueoushumorcanpredicttheprognosisoftrabeculectomyinpatientswithprimaryangle-closureglaucoma(PACG).METHODS:Thiscase-controlstudyinvolved26patientswithPACGwhoexperiencedafailedtrabeculectomy(casegroup)and78age-andsex-matchedpatientswithPACGwhounderwentsuccessfultrabeculectomy(controlgroup).AqueoushumorwascollectedatthetimeoftrabeculectomyandtestedforTSP-1andTGF-β2levelswithanenzyme-linkedimmunosorbentassaymethod.Logisticregressionmodelingwasusedtoassesstheriskfactorsforfailedtrabeculectomy.RESULTS:ThemeanTSP-1aqueousconcentrationsweresignificantlyhigherinthecasegroup(20.67±9.79ng/mL)thanthecontrolgroup(5.17±2.29ng/mL)(P<0.001).Thetransforminggrowthfactor-β2(TGF-β2)aqueousconcentrationsweresignificantlydifferentbetweenthecaseandcontrolgroup,at3633.25and1090.24pg/mL,respectively(P<0.001).LogisticregressionanalysisrevealedTSP-1levelasanindependentriskfactorforafailedtrabeculectomy(OR=3.540;95%CI=1.092-11.482).CONCLUSION:TheaqueoushumorTSP-1andTGF-β2levelsarehigherinPACGeyeswithfailedtrabeculectomythanwithsuccessfultrabeculectomyatoneyear.TheaqueoushumorTSP-1levelisanindependentriskfactorassociatedwithfailedtrabeculectomy.

  • 标签: thrombospondin-1 PROGNOSIS PRIMARY angleclosure GLAUCOMA
  • 简介:Introduction:Frequencydoublingtechnology(FDT)providesascreeningprogramforthedetectionofglaucomatousopticnervedamage.Theexaminationtimeusingthisprogramisveryshort,lessthanoneminutepereye.High-passresolutionperime-try(HRP)isknowntobesensitiveforearlyglaucomadamageandhasbeenreportedtodetectchangeearlier,thanconvention-

  • 标签: 双倍增频技术 FDT 青光眼 筛检 视神经损害
  • 简介:Purpose:Tostudythecorrelationbetweenfunctionalandstructurallossinchronicglaucoma,asdetectedbyFrequencyDoublingTechnology(FDT)andHeilderbergRetinaTomograph(HRT).MaterialandMethods:60eyesof60patientswitheitherocularhypertensionorchronicopen-angleglaucomaunderwentvisualfieldtestingwithbothstandardautomated

  • 标签: 慢性青光眼 结构损害 机能损害 相关性 FDT HRT
  • 简介:我们试验性地学习微观结构和自然奶牛皮革的机械行为。张力的测试用皮革脱衣被执行观察他们的变丑,爬并且失败。奶牛皮革的微观结构是从一些的不同尺寸的纤维的一个分层的、复杂网络到在直径的一些几百纳米,这被发现。他们显示出非线性的压力紧张关系和粘弹性的行为。湿度的效果也被检验。一根multilayered横梁的一个简单理论模型被建议描述最在紧张的基本行为。

  • 标签: 力学性能 天然 牛头 应力应变关系 显微组织 粘弹行为
  • 简介:Inthispaper,westudythenormalityofthefamilyofmeromorphicfunctionsfromtheviewpointofhyperbolicmetric.Then,anewsufficientandnecessaryconditionisobtained,whichcandetermineagivenfamilyofmeromorphicfunctionsisnormalornot.

  • 标签: 双曲度量 家庭 度量和 充分必要条件 亚纯函数
  • 简介:该项目旨在改造智利首都圣地亚哥市中心的绿地,重新为这片逐渐衰败的19世纪老城区注入新的活力。为了庆祝智利独立200周年,众多城市公共项目纷纷展开,该项目的设计作为200周年纪念项目之一,得到了智利政府的授权。

  • 标签: NORMAL 改造 公园 圣地亚哥 市中心 智利
  • 简介:Inthispapertheresultsofahigh-speedtensionexperimentoftheSiC_w/Alcompositehavebeenreportedandasimplifiedtheoreticalmodelhasbeendevelopedtostudythefracturemechanismofcompositesinhigh-speedtension.Thistheoreticalmodelprovidesanewexplanationfortheincreaseofdynamicfracturestrengthofcompositesinhigh-speedtension.

  • 标签: COMPOSITE material HIGH-SPEED tension FRACTURE MECHANICS
  • 简介:马氏体域形成,进化和歼灭广泛地在superelasticNiTi多晶的形状存储器合金的导致压力的阶段转变被观察。由热力学的驱动力的计算和接口的磨擦动力学的加入,领域形态学和它的进化被追踪接口的技术成功地模仿。计算结果与张力的脱衣的试验性的观察同意很好。基于理论、计算的结果,我们在在不同领域模式之间的转变上讨论了批评驱动力和metastability的存在的效果。

  • 标签: 应力诱导 热演化 镍钛形状记忆合金 热力学驱动力 张力 域名
  • 简介:为一个常规短期的设计配方的紧张腿站台(TLP)设计焦点的典型工业实践,它假设N年设计环境导致N年回答。在基于反应的设计方法,TLP被设计承受N年回答而非对N年环境条件作出回应。在这份报纸,我们在场为基于反应的设计方法和使用的概述和一个一般过程比较在二个方法之间的批评TLP回答的案例研究。我们的比较的结果证明常规短期的设计方法经常包含保守主义的一个元素并且基于反应的设计方法能减少设计条件并且从而完成费用积蓄。

  • 标签: 张力腿平台 设计环境 设计方法 TLP 设计条件 成本节约
  • 简介:为了比较在在medication.METHODSA上有选择激光trabeculoplasty(SLT)和那些的病人之间的生活和治疗满足的质量,收到了SLT和用反绿内障药继续的一个控制组的143个绿内障病人上的未来的临床的试用被进行。眼泪分散时间(,但是),标点角膜炎,对帮助的需要,人工的眼泪的使用和intraocular压力(IOP)的治疗满足调查在基线被测量,6并且12mo.RESULTSSLT能减少从1.56需要的药的吝啬的数字

  • 标签: 绿内障 激光治疗 医疗 生活的质量
  • 简介:AIM:Todescribetheresultsof5consecutivecasesofclearlensextractioninangleclosurepatientsforthetreatmentofelevatedintraocularpressure(IOP).·METHODS:Retrospectiveobservationalcaseseries.Allangleclosurepatientswereontwoormoretopicalglaucomamedicationsandhadpriorlaseriridotomy.Eyesunderwentclearlensextractionbyphacoemu-lsificationwithintraocularlensimplantation.·RESULTS:Allfivepatientsinthiscaseseriescarriedthediagnosisofangle-closureglaucomaandhaduncontrolledIOPpriortosurgerydespitetopicalmedications.AfterclearlensextractionthreeofthecaseshadgoodIOPcontrol(IOP<22mmHg)withouttheneedfortopicalmedications.InonecasetheIOPwasbettercontrolledaftersurgery,however,topicalmedicationswererequired.ThedesiredIOPwasnotmetinonecasedespiterestartingmaximumtopicaltherapy.·CONCLUSION:Thiscaseseriessuggeststhattheremaybearolefortherapeuticclearlensextractioninselectcasesofangle-closureglaucoma.

  • 标签: clearlens GLAUCOMA CATARACT angleclosure