简介：Usingultrasonicguidedwavestoassesslongbonefracturesandfracturehealinghasbecomeapromisingdiagnosticissue.Butthemultimodeoverlapoftheguidedwaveschallengesthequantitativeevaluationandclinicalapplication.Inthepreformedstudy,inordertosimplifythesignalinterpretation,thelow-frequencysinusoidialsignalswereusedtoonlyexciteS0andA0modesinfracturedlongbones.TheamplitudesofS0andA0modeswerenumericallyanalyzedwithvariationincrackwidthandfractureangle.Numericalsimulation,basedonthetwo-dimensionfinite-differencetime-domain(2D-FDTD)revealsthatbothS0andA0amplitudesdecreasewiththefracturewidening.However,theincreaseinfractureanglegraduallyenhancestheA0amplitude,whilewithrespecttotheS0mode,itsamplitudeshowsanon-monotonictrendtothevariationinfractureanglewithaturningpointaround45°.TheamplituderatiobetweenS0andA0canreflectthevariationsincrackwidthandfractureangles.ThesimulationillustratesthatultrasonicguidedS0andA0modesaresensitivetothedegreeofbothverticalandobliquefracturesinthelongcorticalbone.Thesefindingsmaybehelpfulforfracturesdiagnosisandhealingevaluationofthelongbone.

简介：A。Kaneko和K。Ota证明了那为一最低限度地(n，λ)连接了图G，如果|G|=p≥3n-1，然后e(G)≤nλ(|G|-n)；并且如果e(G)=nλ(|G|-n)，当时，G对图K_同形(n，p-n)从完全的由两部组成的图K_被获得的~λ(n，p-n)由用λ代替每个边多重边；如果3n-1≥|G|≥n+1，然后e(G)≤λ(|G|+n)~2/8。在这篇论文，我们决定所有最低限度地(n，λ)与顺序p和最大的尺寸λ(p+n连接了图)为3n-1≥p≥n+的~2/81为3n-1≥p≥n+1。

简介：Inthispaper,weconsiderlowerorderrectangularfiniteelementmethodsforthesin-gularlyperturbedStokesproblem.ThemodelproblemreducestoalinearStokesproblemwhentheperturbationparameterislargeanddegeneratestoamixedformulationofPois-son'sequationastheperturbationparametertendstozero.Weproposetwo2Dandtwo3Dnonconformingrectangularfiniteelements,andderiverobustdiscretizationerrorestimates.Numericalexperimentsarecarriedouttoverifythetheoreticalresults.

简介：Theneedforcleanerfuelshasresultedinacontinuingworldwidetrendtoreducedieselsulfurandaromatics.Therearemanyapproachestoreducingsulfurandaromaticsindiesel.Mostofthemhaveacommondrawbackofhighcostbecauseofadoptingtwostagesofhydrotreatingandusingnoble-metalcatalyst,especiallyforreducingaromatics.TheattempttoresolvethisissuehasledtotherecentdevelopmentoftheSingleStageHydrotreating(SSHT)processbyResearchInstituteofPetroleumProcessing(RIPP),SINOPEC.TheSSHTprocessisasingle-stagehydrotreatingtechnologyforproducinglowsulfurandlowaromaticsdiesel.Theprocessusesoneortwonon-noble-metalcatalystssystemandoperatesatmoderatepressure.Whenrevampinganexistingunittomeetlowaromaticsdieselspecification,theonlythingtodoistoaddareactororreplacetheexistingreactor,Inpilotplanttests,theSSHTtechnologyhassuccessfullytreatedSRGO(StraightRunGasOil),LCO(LightCycleOil)ortheblendofthem.ItisshownthatbyusingtheSSHTprocessdieselwithsulfurof30ppmandaromaticsof15m%canbeproducedfromMiddle-EastSRGOanddieselwitharomaticscontentof25m%canbeproducedfromcrackedfeed,suchasFCC-LCO.Highdieselyieldandcetanenumbergain(fromcrackedfeedstocks)givetheSSHTtechnologyaperformanceadvantagecomparedtoconventionalhydrocrackingandhydrotreatingprocesses.Thelowerinvestmentandoperatingcostisanotheradvantage.ThefirstcommercialapplicationoftheSSHTtechnologyhasbeeninoperationsinceSeptember2001.

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简介：Therewasonceatraveler.Hewaswetandcoldbecausehehadbeenridingintherain.Atlasthereachedacountryinn(酒店).Theinnwassocrowded(拥挤的)withpeoplethathecouldnotgetclosetothefire,sohecalledouttotheinnkeeper,""Takesomefishtomyhorse!""Theinnkeeperanswered,

简介：RiceScience(ISSN1672-6308),sponsoredbytheChinaNationalRiceResearchInstituteandpublishedbytheElsevierBV,isaninternationalpeer-reviewedjournalwithfourissuesandonevolumeperyear.Itpublishesoriginalresearchpapers,shortcommunicationsaswellasreviewarticlesunpublishedonappliedricescienceinEnglishlanguage.

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简介：剪下页面左下角的奶牛，使其翻过山顶，到达山下的挤奶棚。按照Twinkle，TwinkleLittleStar的曲调演唱这首歌。移动奶牛，沿着花朵翻越山顶，使奶牛到达山下的挤奶棚。上山时，音调逐渐升高；下山时，音调逐渐降低。