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简介：M:吕先生您好,听闻您在留学期间开过不少车?吕赢:是的,我在法国留学那阵开过Fiesta,美洲豹、320i、525i.M:能说说换车的原因吗?吕赢:当然,我一开始去留学买的第一辆车是福特的嘉年华,那车开了有辆车多吧.一直到毕业两年后,后来换了人生中第一辆小跑车美洲的.那车伴随了我有近六年的时间.那段时间挺疯的,开这车几乎跑遍整个欧洲.后来就换了3系,再随着年龄的增长才换了5系.好像那之后就一直是宝马的坚定用户了.(笑).

简介：车型：F02,配置N52发动机。行驶里程：112051km。故障现象：试车发现在行驶时加速后松开加速踏板再重新加速时车辆有冲击,无论是冷车还是热车都有冲击。ISTA诊断未存有相关故障码,而且在原地踩加速踏板后松开加速踏板能明显地感觉到有漏气的声音,但转速回到怠速时车辆还会出现抖动,仪表指针上下有轻微波动。

简介：UsingtheaveragingtheoryoffirstandsecondorderwestudythemaximumnumberoflimitcyclesofgeneralizedLinarddifferentialsystems{x=y+εhl1（x）+ε2hl2（x）,y=-x-ε(fn1（x）y2p+1+gm1（x）)+∈2(fn2（x）y2p+1+gm2（x）),whichbifurcatefromtheperiodicorbitsofthelinearcenterx=y,y=-x,whereεisasmallparameter.Thepolynomialshl1andhl2havedegreel;fn1andfn2havedegreen;andgm1,gm2havedegreem.p∈Nand[·]denotestheintegerpartfunction.

简介：豪华品牌长轴距的中型车自从奥迪A4L率先发力,将中国这个潜在市场完全唤醒之后,各大豪华品牌纷纷加入到这个阵营中来,我们回顾过往老款的C级以及320i,你会发现它甚至不比现如今的紧凑级车大多少.但各自在经历了加长、加宽、加大的蜕变后,轴距都达到了惊人的2900毫米以上.这样的改变加上各自品牌多年的沉淀,它们都背负了各自品牌热门车型领跑销量的艰巨使命.

简介：Inordertodeepentheunderstandingoftherelationshipbetweenfundamentalproperties（including:microstructureandcomposition）andphotocatalyticperformance,fourbismuthatecompounds,including:LiBiO3,NaBiO3,KBiO3,andAgBiO3,areregardedasresearchexamplesinthepresentwork,becausetheyhaveparticularcrystalstructuresandsimilarcompositions.Usingdensityfunctionaltheorycalculations,theirstructural,electronic,andopticalpropertiesareinvestigatedandcomparedsystematically.Firstofall,thecalculatedresultsofcrystalstructuresandopticalpropertiesareinagreementwithavailablepublishedexperimentaldata.Basedonthecalculatedresults,itisfoundthatthetunneledorlayeredmicro-structuralpropertiesleadtothestrongerinteractionbetweenbismuthandoxygen,andtheweakerinteractionbetweenalkaline-earthmetaland[BiO6]octahedron,resultinginthefeatureofmulti-bandgapsinthecasesofLiBiO3,NaBiO3,andKBiO3.ThisconclusionissupportedbythecaseofAgBiO3,inwhichthefeatureofmulti-bandgapsdisappears,duetothestrongerinteractionbetweenthenoblemetaland[BiO6]octahedron.Thesepropertieshavesignificantadvantagesinthephotocatalyticperformance:absorbinglowenergyphotons,rapidlytransferringenergycarriers.Furthermore,thefeaturesofelectronicstructuresofbismuthatecompoundsarewellreflectedbytheabsorptionspectra,whichcouldbeconfirmedbyexperimentalmeasurementsinpractice.Combinedwiththecalculatedresults,itcouldbeconsideredthatthecrystalstructuresandcompositionsofthephotocatalystdeterminetheelectronicstructuresandopticalproperties,andsubsequentlydeterminethecorrespondingphotocatalyticperformance.Thus,anovelBi-basedphotocatalystdrivenbyvisible-lightcouldbedesignedbyutilizingspecificcompositionstoformfavorableelectronicstructuresorspecificmicro-structurestoformabeneficialchannelforenergycarriers.

简介：Mg–9Li–3Al–1.6Yalloyswerepreparedthroughmixturemethod.Themicrostructure,mechanicalproperties,andcorrosionresistanceoftheas-castandasextrudedalloyswerestudiedbyopticalmicroscopy（OM）,scanningelectronicmicroscopy（SEM）,X-raydiffraction（XRD）,mechanicalpropertiestesting,andelectrochemicalmeasurement.Theas-castMg–9Li–3Al–1.6Yalloywiththeaveragegrainsizeof325lmiscomposedofb-Limatrix,blocka-Mg,andgranuleAl2Yphases.Afterextrusion,thegrainsizeoftheas-castalloyisobviouslyrefinedandreachesto75lm;thestrengthandelongationoftheextrudedalloyareenhancedby17.20%and49.45%,respectively,owingtotheirfinemicrostructureandreductionofcastingdefects.Theas-extrudedalloyshowsbettercorrosionresistancecomparedtotheas-castone,whichmayberelatedtothelowstoredenergyanddislocationdensityintheextrudedalloy,alsothehomogenizationtreatmentbeforeextrusion.

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简介：ThecapacitytocaptureCO2wasdeterminedinseveralstoichiometriccompositionsintheLi2O–Bi2O3system.Thecompounds（Li7BiO6,Li5BiO5,Li3BiO4andLiBiO2phases）weresynthesizedviasolid-statereactionandcharacterizedbyX-raydiffraction,scanningelectronmicroscopyandN2adsorptiontechniques.Thesampleswereheat-treatedattemperaturesfrom40to750°CundertheCO2atmospheretoevaluatethecarbonateformation,whichisindicativeofthecapacityofCO2capture.Moreover,Li7BiO6showsanexcellentCO2capturecapacityof7.1mmol/g,whichisconsiderablyhigherthanthoseofotherpreviouslyreportedceramics.Li7BiO6isabletoreactwithCO2from240°Ctoapproximately660°CshowingahighkineticreactionevenatCO2partialpressurevaluesaslowas0.05.

简介：通过Cu纳米颗粒掺杂制备了Li[（Ni0.6Co0.2Mn0.2）1-xCux]O2三元正极材料,并通过调节Cu的掺杂量,讨论了Cu的掺入对Li[（Ni0.6Co0.2Mn0.2）1-xCux]O2三元正极材料晶体结构、表面形貌、电化学性能和循环性能等一系列性能的影响,铜掺杂量为x=0.01时,在0.2C倍率下的首次放电比容量达到了219.1mAh/g,经过50次充放电循环之后,剩余比容量为115.4mAh/g。最终结果为Li[（Ni0.6Co0.2Mn0.2）1-xCux]O2中Cu的掺入量为x=0.01时,所得正极材料的电化学性能和循环性能最为优异。

简介：Athree-dimensionalfew-layerreducedgrapheneoxide-wrappedmesoporousLi4Ti5O12（m-LTO@FLRGO）electrodeisproducedusingasimplesolutionfabricationprocess.WhentestedasananodeforLiionbatteries,them-LTO@FL-RGOcompositeexhibitsexcellentratecapabilityandsuperiorcyclelife.Thecapacityofm-LTO@FL-RGOreaches165.4mAhg-1after100cyclesbetween1and2.5Vatarateof1C.Evenatarateof30C,ahighdischargecapacityof115.1mAhg-1isstillobtained,whichisthreetimeshigherthanthepristinemesoporousLi4Ti5O12（m-LTO）.Thegraphenenanosheetsareincorporatedintothem-LTOmicrosphereshomogenously,whichprovideahighconductivenetworkforelectrontransportation.