简介：嘹亮的钟声敲向天上的浮云,敲向霜冻的微光送向荒寂高空;旧岁在黑夜中悄悄辞別;嘹亮的钟声在送別旧岁。

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简介：Helenboughtaverynicering(戒指)andsheworeittotheofficethenextday.Nobodysawherring.Shemovedherhandthiswayandthat,butstillnobbdyintheoffieesawtheringonherfinger.Atteatimewhentheyweresitting'round,shesuddenly(突然地)stoodup.“itisveryhothere,”shesaid.“IthinkI'lltakeoffmyring.”

简介：如果你有一个机会得到你想要或想做的承诺时，你会怎么做?让我们一起来看看这位年青的农民是如何对待他的机遇的。

简介：WhenMarywasfourteen,hermothergaveherabeautifulring.ItwasabirthdaypresentandMarywasverypleased.Aweeklatershewaslostherring.Shelookedeverywherebutshecouldnotfindthering.Shelookedinthedustbinoutsidethekitchenbutherringwasnotthere.

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简介：AbstractPurpose:Combined anterior and posterior ring (APR) fixation is classically performed in Tile B2 and C1 injuries to achieve superior biomechanical stability. However, the posterior ring (PR) is the main weight bearing portion that is responsible for weight transmission from the upper parts of the body to the lower limbs through the sacrum and the linea terminalis. It is hypothesized that isolated PR fixation can achieve comparable radiological and clinical outcomes to APR fixation. Therefore, we conducted this study to compare the two fixation principles in managing Tile B2 and C1 injuries.Methods:Our study included 20 patients with Tile B2 injuries and 20 patients with Tile C1 injuries. This study was a randomized control single-blinded study via computerized random numbers with a 1:1 allocation by using random block method. The study was performed at a level one trauma center. A total of 40 patients with Tile B2 and C1 injuries underwent combined APR or isolated PR fixation (Group A and B, respectively). Matta & Tornetta radiological principles and Majeed pelvic scoring system were used for the assessment of primary outcomes and postoperative complications. Secondary outcomes included operative time, amount of blood loss, intraoperative assessment of reduction, need of another operation, length of hospital stay, ability to weight bear postoperatively and pain control metrics. We used student t-test to compare the difference in means between two groups, and Chi-square test to compare proportions between two qualitative parameters. We set the confidence interval to 95% and the margin of error accepted to 5%. So, p ≤ 0.05 was considered statistically significant.Results:The mean follow-up duration was 18 months. The operative time (mean difference 0.575 h) and the intraoperative blood loss (mean difference 97.5 mL) were lower in Group B. Also, despite the higher frequency of rami displacement before union in the same group, there were no significant differences in terms of radiological outcome (excellent outcome with OR = 2.357), clinical outcome (excellent outcome with OR = 2.852) and postoperative complications assessment (OR = 1.556) at last follow-up.Conclusion:The authors concluded that isolated PR fixation could favorably manage Tile B2 and C1 pelvic ring injuries with Nakatani zone II pubic rami fractures and intact inguinal ligament. Its final radiological and clinical outcomes and postoperative complications were comparable to combined APR fixation, but with less morbidity (shorter operation time, lower amount of blood, and no records of postoperative wound infection).

简介：Ringinversionofeightsubstituted2-phenyl-4,4-dimethyloxazolidinesino-dichloro-benzene-d4wasstudiedbyHDNMR.Veryhighinversionbarriers(/nGc/n=86.7—93.4kJ·mol-1)werefoundfortheseoxazolidinerings.Themagnitudeoftheinversionbarrierisdependentonthepolarityofthesubstituentonthephenylgroup.Alinearcorrelationispresentbetweenthe/nGc/noftheinversionandthesubstituentconstant,σ+,ofthesubstituent.

简介：Thebindingenergyofexcitonsconfinedtoaquantumringundertheinfluenceofperpendicularhomogeneousmagneticfieldiscalculatedasafunctionoftheringradius.Calculationsaremadebyusingthemethodofexactdiagonalizationwithintheeffective-massapproximation.Thefeatureofbindingenergyofthegroundstateasafunctionoftheringradiusforseveralvaluesofthemagneticfieldhasbeenrevealed.Theinterestingfeatureofourstudyisthat,inaquantumring,thegeometricstructureofexcitonsmayrevealtransition.

简介：Coldringrollingisanadvancedbutcomplexmetalformingprocessundercoupledeffectswithmulti-factors,suchasgeometrysizesofrollsandringblank,material,formingprocessparametersandfriction,etc.Amongthesefactors,frictionbetweenrollsandringblankplaysanimportantroleinkeepingthestableformingofcoldringrolling.Ananalyticalmethodwasfirstlypresentedforproximatelydeterminingthecriticalfrictioncoefficientofstableformingandthenamethodwasproposedtodeterminethecriticalfrictioncoefficientbycombininganalyticalmethodwithnumericalsimulation.Andtheinfluenceoffrictioncoefficientonthequalityofend-planeandsidespreadofring,rollingforce,rollingmomentandmetalflowcharacteristicinthecoldringrollingprocesshavebeenexploredusingthethreedimensional(3D)numericalsimulationbasedontheelastic-plasticdynamicfiniteelementmethod(FEM)undertheABAQUSsoftwareenvironment,andtheresultsshowthatincreasingthefrictiononthecontactsurfacesbetweenrollsandringblankisusefulnotonlyforimprovingthestabilityofcoldringrollingbutalsoforimprovingthegeometryanddimensionprecisionofdeformedring.

简介：Oncetherelivedtwobirds.Theywereneighbours.Theyhadknowneachothersincetheywereborn.Theyplayedtogetherandhelpeachotherwhentheywereyoung.Thegirlfellinlovewiththeboyandtheboylovedthegirlverymuchwhentheygrewup.

简介：TheauthorgivessimplecharacterizationoftheHenselizationofanexcellentregularlocalring.

简介：ABSTRACT:Westudytheevolutionofsingleellipticvortexringforinitialaspectratio(AR)=2,4,6.TheincompressibleNavier-Stokesequationsaresolvedbyadealiasedpseudo-spectralmethodwith64~3gridpointsinaperiodiccube.WefindthattherearethreekindsofvortexmotionasARincreasesandvortexbifurcationoccursatacertainAR.Theprocessesofadvection,interaction,anddecayofvortexringareanalyzed.Numericalresultscoincidewithexperimentsandothernumericalsimulations.

简介：Inthispaper,notonlyvariouscharacterizationsofcentralelementofmatrixringaregiven,butalsotheindexofcentralelementofmatrixringisdecided.Finally,anaddition-aldiscussiononthoseproblemsisprovidedtoo.1Introduction

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简介：Quantumalgorithmsbringgreatchallengestoclassicalpublickeycryptosystems,whichmakescryptosystemsbasedonnon-commutativealgebraicsystemshoptopic.Thebraidgroups,whicharenon-commutative,haveattractedmuchattentionasanewplatformforconstructingquantumattack-resistantcryptosystems.Aringsignatureschemeisproposedbasedonthedifficultyoftherootextractionproblemoverbraidgroups,whichcanresistexistentialforgeryagainsttheadaptivelycho-sen-messageattackundertherandomoraclemodel.

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简介：Functionaltricuspidregurgitation(TR)primarilyarisesfromasymmetricdilationofthetricuspidannulusinthesettingofrightventriculardysfunctionandenlargementinresponsetoleft-sidedmyocardialandvalvularabnormalities.EveniftheTRisnotsevereatthetimeofmitralvalvesurgery,itcanworsenandevenappearlateaftersuccessfulmitralvalvesurgery,whichportendsapoorprognosis.DespitedatademonstratinginferioroutcomesinthepresenceofresidualTR,surgicalrepairforfunctionalTRremainsunderused.AcceptanceofTR,inthepresenceoftricuspidannulardilation,maybeunacceptable.Surgicalrepairshouldconsistofplacementofarigidorsemirigidannularring,whichhasbeenshowntoprovidesuperiordurabilityascomparedwithsutureandflexiblebandtechniques.Finally,percutaneousannuloplastyforcorrectionoffunctionalTRmayallowtreatmentofpatientswithrecurrentTRathighriskofreoperation.