简介：Sincethecarbohydratecontentaffectspearflavorduringtheprocessofgrowth,itisnecessarytodeterminethesugarcomponentsthataccumulateinthefruit.Weanalyzedthefruitcarbohydratecontent,andthegeneexpressionandactivityofacidinvertase(AI),neutralinvertase(NI),sucrosesynthase(SS),andsucrosephosphatesynthase(SPS)duringthedevelopmentof“Huangguan”and“Yali”pears.Theresultsdemonstratethatduringdevelopment,thefruitsugarmetabolismofthe“Huangguan”pearfollowsatypicalsorbitol–starch-solublesugarsmiddlemodel,whereasthe“Yali”pearfruitfollowsatypicalsorbitol–sucrose–starch-solublesugarsmiddlemodel.Inthe“Huangguan”pear,wefoundtheAIandNIgeneexpressions,aswellasAI(P<0.05)andNI(P<0.01)enzymeactivities,tobepositivelycorrelated,whereaswefoundtheNIgeneexpressionandNIenzymeactivityof“Yali”peartobenegativelycorrelated(P<0.01).Weobservedthehighlevelsoflate-stageAIandearly-stageSSduringdevelopmenttoroughlycorrespondwiththegeneexpressionfoundinthelateandearlystages,respectively,suggestingtheirpotentialregulatoryrolesin“Huangguan”pearfruitdevelopment.OurresultsindicatethattheprimaryfunctionofSPSduringtheearlydevelopmentalstageistoaccumulatesucrose,whereastheprimaryfunctionofAIistopromotehexoseaccumulationduringthelatedevelopmentalstageofmature“Yali”pearfruit.

简介：在为技术建模的脑电图(EEG)，数据片断选择是首先并且仍然重要的步。在一个基于EEG的大脑计算机接口(BCI)的特征抽取和分类上的一套data-segment-related参数的影响被学习。一个汽车搜索算法被开发在12题目EEG的每试用学习四个data-segment-related参数。数据片断(LDS)的长度，数据(SPD)的开始位置试用(NT)的片断，AR顺序，和数字被用来造模型。学习证明与没有参数选择的分类比率(CR)相比，CR被20%～30%与这些data-segment-related参数的合适的选择增加，并且最佳参数值是易于依赖者的。当为BCI造模型时，这建议data-segment-related参数应该被有个性。

简介：Background:Motorcompetenceandhealth-relatedfitnessareimportantcomponentsforthedevelopmentandmaintenanceofahealthylifestyleinchildren.Thisstudyexaminedcross-culturalperformancesonmotorcompetenceandhealth-relatedfitnessbetweenPortugueseandU.S.children.Methods:Portuguese(n=508;10.14±2.13years,mean±SD)andU.S.(n=710;9.48±1.62years)childrenperformedtestsofcardiorespiratoryfitness(ProgressiveAerobicCardiovascularEnduranceRun),upperbodystrength(handgrip),locomotorskillperformance(standinglongjump),andobjectprojectionskillperformance(throwingandkicking).PortugueseandU.S.childrenweredividedinto2agegroups(6à9and10à13years)fordataanalysispurposes.Atwoàfactoroneàwayanalysisofcovariance(ANOVA)wasconductedwiththeProgressiveAerobicCardiovascularEnduranceRun,handgrip,standinglongjumpscores,kicking,andthrowingspeed(km/h)asdependentvariables.Results:ResultsindicatedthatPortuguesechildren,irrespectiveofsex,presentedbetterperformancesinlocomotorandcardiorespiratoryperformance(standinglongjumpandProgressiveAerobicCardiovascularEnduranceRun)thanU.S.childreninbothagebands.U.S.childrenoutperformedPortuguesechildrenduringthrowingandhandgriptests.Kickingtestspresentedgenderdifferences:PortugueseboysandU.S.girlsoutperformedtheirinternationallymatchedcounterparts.Conclusion:Culturaldifferencesinphysicaleducationcurriculaandsportsparticipationmayimpactdifferencesinmotorcompetenceandfitnessdevelopmentinthesecountries.

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简介：《21世纪大学英语》(21stCenturyCollegeEnglish)是获奖的“全国普通高校优秀教材”。该教材文化背景知识(Text-relatedInformation)丰富、内容新颖。在教学中充分利用教材中的文化背景内涵,加强大学英语文化融入教学,是提高学生的跨文化交际能力和适应日益增强的国际交流的需要。