简介：你知道一个人在什么时候生长速度快?什么时候停止生长?在早晨还是晚上高?

简介：HowcanteachersteachEnglishwritingeffectively?Andhowcanstudentslearntowriteessayscorrectly?TheseseemtobetwopuzzlingproblemsforChineseteachersandlearners.Thispaperaimstointroduceanewteachingapproach:theLengthApproach,anddiscussesitsmerits.

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简介：Forgivendata(ti,yi),I=0,1,…,n,0=t0＜t1＜…＜tn=1westudyconstrainedinterpolationproblemofFavardtypeinf{‖f'‖∞|f∈W2∞[0,1],f(ti)=yi,i=0,…,n,l(f;[0,1])≤l0},wherel(f';[0,1])=∫10/1+f'2(x)dxisthearclengthoffin[0,1].Weprovetheexistenceofasolutionf*oftheaboveproblem,thatisaquadraticsplinewithasecondderivativef'*,whichcoincideswithoneoftheconstants-‖f'*‖∞,0,‖f'*‖∞betweeneverytwoconsecutiveknots.Thus,weextendaresultofKarlinconcerningFavardproblem,tothecaseofrestrictedlengthinterpolation.

简介：AbstractBackground and objective:The size of the cochlea varies a lot among the human population bringing the necessity for electrode arrays to be available in various lengths irrespective of the cochlear implant (CI) brand. This research software helps in the estimation of the patient’s cochlear duct length (CDL) which is then used for the simulation of the correct length electrode array matching the patient’s cochlear size and as well in getting the patient specific cochlear frequency map.Methods:Visual Studio Express 2012 for Windows Desktop is used in the architecture of this research software. The basal turn diameter of the cochlea ( "A" value) needs to be measured from the pre-operative computed tomography (CT) image of the patient’s temporal bone. This "A" will be taken as the input for the CDL equations proposed by Alexiades et al for estimating the CDL along the basilar membrane for various insertion depths. Greenwood’s equation is then used in combination with the CDL for the full length of the cochlea in getting the patient specific frequency map.Results:The research software with the help of the "A" value as input, with few button clicks, gives the patient specific CDL for various insertion depths and the Greenwood’s frequency map. The users have the choice to select any electrode array of their choice and place it under the frequency map to see how good it fits to that particular patient’s cochlea. Also, given the possibility to drag and move the electrode array picture to mimic the post-operative actual electrode insertion depth.Conclusions:This research software simplifies the overall process of CDL estimation and in getting the patient specific cochlear frequency map. The clinicians get the chance to simulate placing the various electrode array lengths in patient cochlea in identifying the best fit electrode. This could help in pushing the CI field into the concept of individualized CI electrode array solution that ultimately benefits the patients.

简介：Surfaceeffectsonthepersistencelengthofquasi-one-dimensionalnanomaterialsareinvestigatedbyusingthetheoryofsurfaceelasticityandthecore–shellmodelofnanobeams.Asimpleandunifiedexpressionisprovidedtodeterminethepersistencelengthofnanowiresandnanotubeswithanyregularpolygonalcross-sections.Itisdemonstratedthatsurfaceeffectshaveadistinctinfluenceonthepersistencelengthwhenthecharacteristicsizesofmaterialsshrinktonanometers.Thisworkishelpfulnotonlyforunderstandingthesize-dependentbehaviorofnanomaterialsbutalsoforthedesignofdevicesbasedonnanotubesornanowires.

简介：Classicalsortingbyreversalsusestheunit-costmodel,thatis,eachreversalconsumesanequalcost.Thismodellimitsthebiologicalmeaningofsortingbyreversal.Benderandhiscolleaguesextendeditbyassigningacostfunctionf(l)=lαforallα≥0,wherelisthelengthofthereversedsubsequence.Inthispaper,weextendtheirresultsbyconsideringamodelinwhichlongreversalsareprohibited.Usingthesamecostfunctionaboveforpermittedreversals,wepresenttightornearlytightboundsfortheworst-casecostofsortingbyreversals.Thenwedevelopalgorithmstoapproximatetheoptimalcosttosortagiven0/1sequenceaswellasagivenpermutation.OurproposedproblemsaremorebiologicallymeaningfulandmorealgorithmicallygeneralandchallengingthantheproblemconsideredbyBenderetal.Furthermore,ourboundsaretightandnearlytight,whereasouralgorithmsprovidegoodapproximationratioscomparedtotheoptimalcosttosort0/1sequencesorpermutationsbyreversals.

简介：Basedontheperiodicstructureofcodeworksoflinearblockcodes,anewideaoflength-varyingcodingdigitalcommunicationssystemisproposedtosavethechannel.Itisshown,byexample,thatupto1/3ofchannelcapacitycanbesavedbythenewsysteminsomespecialsituations.Inordertofindwhichblockcodeissuitabletouseinlength-varyingcodingsystem,theperioddistributionofthecodehastobecal-culated.Newrwsultsabouttheperioddistributionarepresentedwhilemanyopenproblemsremain.

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简介：固体加速长度在一张冷稠密的运输病床上被调查(0.10中间的

简介：Phenologyshiftsandrangeexpansionscauseorganismstoexperiencenoveldaylength-temperaturecorrelations.Dependingonthetemporalniche,organismsmaybenefitorsufferfromchangesindaylength,thuspotentiallyaffectingphenologicaladaptation.WeassessedtheimpactofdaylengthchangesonlarvaeofChrysoperlacarnea(Stephens)andEpisyrphusbalteatus(DeGeer),bothofwhichpreyonaphids.LarvaeofE.balteatusarenight-active,whereasthoseofC.carneaappeartobecrepuscular.Wesubjectedbothspeciesinclimatechamberstodaylengthsof16:8L:Dand,tocircumventdiapauseresponses,20:4L:D.Werecordeddevelopmenttimesandpredationratesofbothspecies.E.balteatusgrew13%fasterinthe16:8L:Dtreatmentandpreyedonsignificantlymoreaphids.Incontrast,C.carneagrew13%fasterinthe20:4L:Dtreatmentandhigherpredationratesin20:4L:Dweremarginallysignificant.Ourresultsshowthatdaylengthaffectsdevelopmentandpredation,butthatthedirectiondependsonspecies.Suchdifferencesintheuseofdaylengthmayaltertheefficiencyofbiocontrolagentsinachangingclimate.

简介：Multimode干扰(MMI)设备广泛地在平面lightwave电路(PLC)被使用。设备长度能很好与逐渐变细的multimode区域被减少。传统的设计公式基于弱限制的波导为MMI设备显示出大错误。作为波导宽度的替换与模式宽度基于分析，有更好的精确的一个设计公式被介绍。有软件模拟的比较验证了它的精确。CLC数字TN256

简介：DHToflengthplq（pisoddandqisarbitrary）isturnedintoplDHTsoflengthqandsomeadditionaloperations,whiletheadditionaloperationsonlyinvolvesthecomputationofcos-DFTandsin-DFTwithlengthp.IfthelengthofaDHTisp1l1…PNlN2l（P1…,PNareoddprimes）,afastalgorithmisobtainedbythesimilarrecursivetechnique.Therefore,thealgorithmcancomputeDHTofarbitrarylength.ThepaperalsoProvesthatoperationsforcomputingDHToflengthNbythealgorithmarenomorethanO（Nlog2N）,whenthelengthisN=pl,operationsofthealgorithmarefewerthanthatofotherknownalgorithms.

简介：空间关联系数是为对浅水里的健全繁殖的描述的最重要的参数之一。纵的关联长度的频率依赖仍然是一个开的话题。我们在一个浅水实验观察到以波长的单位的纵的关联长度随频率的增加增加。这现象没在出版报纸被看见。理论分析和数字模拟显示底部变细的非线性的频率关系是这现象的主要原因。

简介：Consideringtheclass(n,m)oforderedtreeswithmleavesandn-minternalnodes,asetofgeneratingfunctionsareestablishedforthefollowingproblems:(1)thetotalnumbernodeswithdegreeroverΓ(n,m),(2)thetotalpathlengthofnodesoverΓ(n,m),and(3)thetotalnumberofnodesoverΓ(n,m)onlevelk.Someparticularcountingfomulasarederivedfromthem.

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简介：高效率的优点，低SFC(特定的燃料消费)，超离频绕过比率扇涡轮引擎吸引越来越多的注意在现代广告引擎。中间的汽轮机管(ITD)它高连接有低压力的压力汽轮机(HPT)汽轮机(并行口)，由指导流动没有太多损失，从HPT来到并行口在汽轮机的全面表演上有批评影响。因此，掌握设计好攻击的、甚至超级好攻击的ITD的技术变得越来越迫切。更多担心被专注于管。然而，改进汽轮机以便推进，并行口嘴被排列成ITD弄短低压力轴。与如此的设计概念，那块并行口嘴流动地被在上游的管结构容易影响，是明显的，但是相反收到少得多兴趣。在这份报纸，数字方法被用来调查一些ITD的效果与在上游打漩并行口上的片嘴。有一样的九个模型打漩并且嘴片当ITD的长度是唯一的时要换掉的参数，将被讨论。最后，为设计者的几个结论和忠告被总结。在改变管，入口和插头的轴的长度以后，嘴的流动地相应地不同。在另一方面，表面介绍的嘴片(吸和压力)上的砍的压力在各种各样的入口流动下面的单个特征。除了那，像计时的效果在这份报纸被描述，它将贡献大部分到压力损失并且应该被付足够的注意。

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