简介：

简介：欧宝在2004年的日内瓦车展上推出了带电子液力收折硬顶的2座小车:TigraTwinTop。由于出色的可折合车顶设计,因此TigraTwinTop可以在外形设计以及贮存空间方面有更多的余地。也因为如此,TigaTwinTop一举获得了2004年年日内瓦车展的"2004年最佳敞篷车"的荣誉。

简介：Thedynamicandstaticrecrystallizationbehaviorsoftwinrollcastlowcarbonsteelstripwereinvestigatedwithanattempttoprovideguidingdeformationparametersfortheonlinehotrolling.Inordertoinvestigatedynamicrecrystallizationbehavior,ascaststripwasreheatedandsoakedwithaustenitegrainsizesimilartothewidthleveloftheascastcolumnarstructure.Tensiletestwasusedandthedeformationtemperatureisintherangeof900℃to1100℃andstrainratesare0.01s-1,0.1s-1,1s-1.Theactivationenergyandstressexponentweredeterminedas306kJ/moland4.69respectively.Theratioofcriticalstraintothepeakstrainis0.65,andthatofcriticalstresstothepeakstressis0.92.ThedependenceofthepeakstrainontheinitialgrainsizeandZener-HollomonparametersZisεp=9.1×10-4×D00.48Z0.13.Thekineticsofthedynamicrecrystallizationandrecrystallizedgrainsizewaspredictedusingmodelspublished.Theascastcoarseausteniteweredramaticallyrefinedaftercompletedynamicrecrystallization.Forstaticrecrystallization,thetensiletestwascarriedoutonGleeble-3500thermo-mechanicalsimulator.Thedeformationtemperatureisintherangeof800℃to1200℃withstrainrate0.01s-1to1s-1.Theprestrainisfixedat0.04to0.12andtheinter-hitdelaytimevariesfrom1sto3000s.TheactivationenergyandAvramiexponentofstaticrecrystallizationweredeterminedas241kJ/moland0.54respectively.Akineticsmodelwasproposedtodescribethestaticrecrystallizationkinetics.Thepredictedresultswereingoodagreementwiththeexperimentalresults.

简介：Thetotalefficiencyofpowerplantsdependsontheenergyconversioninacombustorandaturbine.Considerablyhigherenergytransferratescanbeobtainedfromapulsedcombustion.butunsteadyflowofasinglejetcombustorreducestheturbineefficiency.Therefore.twopulsecombustorsweresetinparallelandconnectedtoasettlingchamberthatsuppliesaflowwithconstantpressuretotheturbine.Theaimofinvestigationspresentedhereisademonstrationoftechnicalfeasibilityforindustrialapplicationsandtoshowthebenefitsobtainedfromthepulsecombustors.

简介：

简介：线性系统的一个反复的答案被学习，它从天线由混合有限元素的方法和时刻的方法与绝缘的目标依附的一根电线的discretization产生(混合女性妈妈).It是有效的由混血儿为如此的电磁的问题建模女性妈妈，因为它两个都拿优点女性的并且妈妈的ability.But结果的线性系统是复杂的，并且它是难的被Krylovsubspace方法独自解决，一种二水平的preconditioning技术将因此是

简介：

简介：

简介：WiththebackgroundofthecontrolofadditionalmechanicalforcedroplettransferinMIG/MAGwelding,regardingtheACservomotorascore,anoveloscillatingwirefeedingsystemhasbeendevelopedwithexcellentperformancesofcontrolanddynamicaccelerationwhichistested.Systemconstitutionandoperationprincipleareintroducedinthispaper.Influencesofparametersondynamicaccelerationperformanceareanalyzedanddiscussedemphatically,suchasoscillatingfrequency,oscillatingamplitudeanddraw-backspeed.Experimentalresultindicatesthataccordingtothetechniqueofweldingcontrol,thenovelwirefeedingsystemrespondsrapidlytovariouskindsofcontrolordersofwirefeedinganddraw-back,andrealizesflexiblecontrolofweldingwireaxialmovement,includingdynamicshifting,oscillatingandsoon.

简介：AbstractPurpose:Treatment of irreducible femoral intertrochanteric fractures often requires open reduction. However, the technique unavoidably causes patients to suffer greater trauma. As such, minimally invasive techniques should be employed to reduce the surgical-related trauma on these patients and maintain a stable reduction of the fractures. Herein, a minimally invasive wire introducer was designed and used for the treatment of femoral intertrochanteric fractures. The effectiveness of using a wire-guided device to treat irreducible femoral intertrochanteric fractures was evaluated.Methods:Between 2013 and 2018, patients with femoral intertrochanteric fractures who were initially treated by intramedullary nail fixation but had difficult reduction using the traction beds were retrospectively reviewed. Decision for an additional surgery was based on the displacement of the fracture. The patients were then divided into two groups: those in the control group received an open reduction surgery while those in the observation group received a closed reduction surgery using a minimally invasive wire introducer to guide the wire that could assist in fracture reduction. The operation time, blood loss, visual analogue scale scores, angulation, reduction, neck-shaft angle, re-displacement, limb length discrepancy, and union time were then recorded and analyzed to determine the efficiency of the wire introducer technique. Categorical variables were analyzed by using Chi-square test, while continuous variables by independent t-test and the Mann-Whitney test accordingly.Results:There were 92 patients included in this study: 61 in the control group and 31 in the observation group. There were no significant differences in baseline demographic factors between the two groups. All surgeries were successful with no deaths within the perioperative period. The average follow-up time for the patients was 23.8 months. However, the observation group had a significantly shorter operation time, lower visual analogue scale score, less intraoperative bleeding, and shorter fracture healing time. There were no significant differences in the angulation, reduction, neck-shaft angle, and limb length discrepancy between the two groups.Conclusion:The minimally invasive wire guide achieved a similar effect to that of open reduction in the treatment of intertrochanteric fractures with difficult reduction. Moreover, the minimally invasive wire introducer is a good technology that accurately guides the wire during reduction. Indeed, it is an effective technique and achieves good clinical outcomes in restoration of irreducible femoral intertrochanteric fractures.

简介：

简介：Thermaltransportinahighlyporousmetallicwire-wovenbulkKagome(WBK)isnumericallyandanalyticallymodeled.Basedontopologysimilarityanduponintroducinganelongationparameterinthermaltortuosity,anidealizedKagomewithnon-twistedstrutsisemployed.SpecialfocusisplaceduponquantifyingtheeffectoftopologicalanisotropyofWBKuponitseffectiveconductivityItisdemonstratedthattheeffectiveconductivityreduceslinearlyastheporosityincreases,andtheextentofthereductionissignificantlydependentontheorientationofWBK.ThegoverningphysicalmechanismofanisotropicthermatransportinWBKisfoundtobetheanisotropicthermaltortuositycausedbytheintrinsicanisotropictopologyofWBK.

简介：AbstractTwin anemia polycythemia sequence (TAPS) is a chronic form of unbalanced feto-fetal transfusion through minuscule placental anastomoses in monochorionic twin pregnancies, leading to anemia in the donor twin and polycythemia in the recipient twin. TAPS can occur spontaneously in up to 5% of monochorionic twins or can arise in 2%-16% of cases after incomplete laser surgery for twin-twin transfusion syndrome. TAPS can develop across the entire second and third trimester. Antenatal diagnosis for TAPS is reached via Doppler measurement of the fetal middle cerebral artery peak systolic velocity, showing an increased velocity in the donor, combined with a decreased velocity in the recipient. Treatment options for TAPS include expectant management, preterm delivery, intrauterine blood transfusion with or without a partial exchange transfusion, fetoscopic laser surgery and selective feticide. The best treatment option is unclear and is currently being investigated in an international multicenter randomized trial (the TAPS trial). Spontaneous fetal demise occurs in 5%-11% of TAPS twins, more often in donors (8%-18%) than in recipients (2%-5%). Severe long-term neurodevelopmental impairment is seen in 9% of TAPS twins, with donors having an increased risk for cognitive impairment and hearing problems (15%).

简介：Inthisstudy,systematicphysicalmodeltestswereperformedtoinvestigatethewaveforcesonthetwin-platebreakwaterunderirregularwaves.Basedontheexperimentalresults,theeffectsoftherelativeplatewidthB/L,waveheightHs/Dandincidentangle00onthewaveforceswereanalyzedanddiscussed.Theresultsshowedthat：（1）Theenvelopesofthetotalwavepressureweregenerallysymmetricalalongthedirectionofplatewidthundertheincidentangles（θ0）being0°,15°,30°,45°and60°.Inparticular,theenvelopesofwavepressureatθ0=30°werelargerthanallothercases.（2）Thesynchronouspressuredistributionofthebreakwaterunderobliquewaveactionwasmorecomplicatedcomparingtothenormalincidentwaves.（3）Basedondataanalysis,anempiricalformulawasobtainedtoestimatethetotalverticalforceofthetwin-platebreakwater.Thisempiricalformulacanbeagoodreferenceforthedesignbasisofengineeringapplicationsunderspecifiedwaveconditions.

简介：摘要目的探讨Twin-block矫治器的咬合重建和临床应用。方法选取2013年1月～2015年6月收治的安氏Ⅱ类错患者8例临床Twin-block矫治器治疗的临床应用进行分析。结果所有患者经Twin-block矫治器治疗均了得良好的矫治效果，前牙覆盖正常，侧貌均得到很大改善，矫治效果比较满意。结论当上下垫的接触斜面呈相反方向时，即可对下颌有强迫后退的作用，此时，可以用来矫治Ⅲ类错。

简介：Thenumericalinvestigationofregularwavesinteractingwithasubmergedhorizontaltwin-platebreakwaterispresentedinthispaper.Anumericalmodelwithanabsorbingwave-makerisestablishedbasedontheVOFmethod.Thevalidityofthemodelisverifiedbyexperimentalresults.Comparisonsbetweenthenumericalandexperimentalresultsshowthatboththewatersurfaceprofilesandthewave-inducedpressurescanbemodeledaccurately.Wavedeformationoverthebreakwater,waterparticlevelocitiesaroundthebreakwater,andthewave-inducedpressuresonthestructurearenumericallyinvestigated.Thepressureamplitudesofthefundamentalandsecondharmonicsonthemodelsurfaceareexaminedinvariouswaterdepths.Thecomputedandexperimentalresultshaverevealedthatthehigherfrequencycomponentsaregeneratedattheonshoresideofthebreakwater.Furthermore,thecomputedresultsdemonstrateacirculatingflowformedattheonshoresideofthebreakwater.

简介：

简介：Apilotwiredrawingmachineaswellaswireend-pointingrollerwasdeveloped.Usingthesemachines,awiredrawingtestforfourdifferentcoatingmaterialsandtwodifferentlubricantswasperformedasthereductionratioincreasedfrom10%to30%.Materialsusedforasubstrateinthisstudyareplaincarbonsteel(AISI1045)andultralowcarbonbainitesteel.Tocomputethefrictioncoefficientbetweenthecoatinglayerofwireandthesurfaceofdieforaspecificlubricant,aseriesoffiniteelementanalyseswerecarriedout.SEMobservationswerealsoconductedtoinvestigatethesurfacedefectsofwiredeformed.Resultsshowthatthebehaviorofdrawingforcevarieswiththelubricant-typeattheinitialstageofdrawing.Thepowder-typedlubricantwithalargeparticlecausestheretardationoffulllubricationontheentirecontactsurfaceandthelocaldelaminationofcoatinglayeronthewiresurface.Astheflowstressofasubstrateincreases,thedelaminationbecomessevere.

简介：

简介：Animprovedsmoke-wireflowvisualizationtechniqueusingalargecapacitorasthepowersourcewasproposed.Electriccurrentdischargedfromcapacitorswasusedtoheatafinemetalwiresuspendedintheflowfield.Theoildropletsattachedtothewirewerevaporizedandsmokefilamentsfollowedtheflowmotions.Adigitalcamerawasusedtorecordtheimagesofthesmokefilaments.Theactionsofdischargingandcamerashutterweretriggeredbysignalsfromamicrocontrollertoensuretheaccuratetiming.Clearimagesofthestreaklineswerecapturedatafreestreamvelocityupto12.9m/s,muchhigherthanthelimitsoftheexistingtechniques.