简介：Itisanimportanttasktoanalyzethescheduleriskinaprojectmanagement.Asasemi-constructedornon-constructedcomplexsystem,therearemanydifficultiesinthequantitativeanalysisoftheschedulerisk(SRA).Thepaperintegratesintelligenttechniquestoobtainmassivebasicdatarequiredintheriskanalysisprocess.ItgreatlyimprovestheprecisionandefficiencyoftheSRA.Inaddition,thepaperpresentsamechanismandarchitectureoftheintegratedintelligentsystems.Finally,theconcludingremarksareprovidedforbasicdataacquisitionintheSRA.

简介：本文以语言学、认知心理学和学习论等理论为指导,根据中国学生在非目标语交际环境中对某些词素习得序列的研究成果,探讨词素习得在目标语与非目标语交际环境中的异同特点。作者提出,语言习得和语言学习是一个互为依托的认知过程,只要在语言课堂里能给学生提供有效而丰富的语言理解输入,语言习得是一种渐进而有序的必然现象。比较研究证明,学习与习得过程要受语言内部规律的制约。国内外词素习得序列的研究成果对语言教学和教材编写有积极意义。

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简介：极端宽带(UWB)要求的高速度的高分辨率的analog-to-digital(A/D)变换信号处理是一个很挑战性的问题。这份报纸为UWB信号获得建议一个平行随机的设计方法。建议方法能完成高采样率，高决定和硬件实现的技术可行性。在建议方法，一个模拟UWB信号在一套随机的符号函数上被投射。然后，低率的高分辨率的analog-to-digital变流器(模数转换器)被用来取样设计系数。信号能被简单线性计算与采样矩阵重建，没有遵循优化算法和优先的知识。在另外的方面，不同其它走近那需要在极其高的频率利用精确时间移动，或设计一个混合过滤器银行，或与优先的知识为信号产生特定的基础功能或工作，建议方法是一条通用采样途径并且对容易适用。到噪音比率(SNR)和假免费的动态范围(SFDR)的信号的模拟结果为UWB信号获得验证建议方法的效率。

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简介：Inrecentyears,languagetransferhasbeenattachedgreatimportanceinthestudiesofsecondlanguageacquisitionandteaching.Boththepositiveandnegativetransfershouldbepaidgreatattentionto.Theinfluenceofmothertongueisthecoreaspectinthetransfertheoryofsecondlanguageacquisition.Ontheonehand,ifthesimilaritiesofthetwolanguagescanbefullyutilizedandcanproduceresultsthatfacilitatethesecondlanguageacquisition,theinfluencescanbereferredtoaspositive,andthetransfercanbecalledpositivetransfer.Ontheotherhand,negativetransferexistswhenmothertonguehasinsertedinterferenceswhichmaycauseerrorsinthesecondlanguageacquisitionprocess.Restrictionsmayoccurintheacquisitionprocessofsecondlanguage.

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简介：SNDisasphericalnon-magneticdetector,whichoperatedsince1996atVEPP-2Melectron-positroncolliderinNovosibirsk.NowVEPP-2McolliderisdismantledtobereplacedbyanewVEPP-2000machinewithhigherenergyandluminosity.TheSNDdetectorisalsoperformingupgradeofitssubsystemsincludingelectronics,andsoftware,ExpectedsubstantialgrowthofeventsdataflowrequiresradicalchangesintheDataAcquisition(DAQ)systemsoftware.ThispaperdescribestheSND2000softwarearchitecrureanditsprincipalcomponents.Firstthemaineventsflowprocessuingcomponentsareconsidered-thereadoutprocessandtheL3-triggerfarm.AfterprocessingbyL3theeventsflowiseitherloggedtotapeorfedtocalibrationandslowcontrolprocess.Usingauxiliarycontrolandservicesoftwarecomponents,whicharealsodescribed.performsthemanagementoftheseactivities.

简介：identification and classification of learning strategy. The problems are reviewed concerning the definition and classification of learning strategies and then the paper tentatively introduces Cohen’s approach to defining learning strategies in terms of prototypicality of features of learning strategies.,Cohen’s attempt to describe the prototypicality of strategies is a step forward concerning defining learning strategies. It might reflect the nature of learning strategies to a large extent because the answers to the questionnaire come from strategy experts. It is true that some problems still exist. For example,all-or-nothing feature but in terms of how far along a continuum a feature could possibly go before it stopped being descriptive of a strategy. This is an approach of defining learning strategies in terms of how prototypical the feature was. These features as follows are arranged in a descending order of agreement

简介：Thispaperdevelopsamethodwhichcanbeusedtoassistaerialnavigationbydeterminingthespatialpositionandpostureoftheaerialphotographicplane.Afterthemethod,aerialimagesmatchknownDEMtocapturethespatialpositionandposture.Someaerialimagesandterraindataareusedtotestifyourmethod.Comparedwiththoseofanalyticandstereomappers,theresultsbyourmethodarecorrespondenttorealmeasurementswell.

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简介：and evaluating the success of a particular strategy. They have an executive function. In O’Malley and Chamot framework of learning strategies,Oxford’s taxonomy fails to make a distinction between strategies directed at learning the L2 and those directed at using it (Ellis). The last problem is that compensation strategies are considered as a direct type of learning strategies rather than one type of production strategies,cognitive and social/affective. They grounded the study of learning strategies within the information-processing model of learning developed by Anderson. Metacognitive strategies involve consciously directing one’s efforts into the learning task. These strategies are higher order executive skills that may entail planning learning

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简介：TheresearchesonCriticalPeriodHypothesis(CPH)aimstoexplaintheimportanceoftheagefactorintheprocessoflearningasecondlanguage.Inthisessay,acriticalreviewofthetheoreticalissuesandempiricalresearchontheCPHwillspreadout.Meanwhile,thediscussionofimplicationandlimitationoftheCPHresearchwillbeconcernedaswell.

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简介：Besidesthesameperformanceastheearthquakeobservationsystempossessusedonthefixedearthquakestation,suchaswidedynamicrange,highresolution,followingspecialfeaturesarenecessaryfortheearthquakedataacquisitionsystem(EDAS)appliedformobileobservinginordertosuitforrunninginthefield:a)Reliability.TheEDASmustworkstablylongtimewithoutbeingcared.b)Adaptabilitytothefieldenvironments.Earthquakeobservinginthefieldoftenencountersawfulenvironments,suchasdampness,dust,andabnormalclimate,sohowtomaketheinstrumentrunwellinthefieldcircumstancemustbeconsidered.c)Abilityofanti-vibration.Theinstrumentforoutdoorapplicationmustkeepfreefrombeingdestroyedduringbeingtransportedlongdistancetothedestination.d)Storagecapacity.Becauseseismologicaldataislarge,howtostoreandcollectthelargeamountdataconvenientlyfromthefieldisalwaysadifficultpointinthemobileobservingsystemdesign.e)Automation.Timingandpositioningautomaticallyisnecessaryinthefield.f)Powerconsumption.Toreducethepowercon-sumptionaslowaspossibleisveryimportanttothemobileinstrumentwhicharepoweredwithbattery.g)Abilityoftestingitself.Testingitselfautomaticallymakeitconvenientinthefieldwork.h)Portability.Theinstrumentmustbeportableandsimplyoperated.

简介：地震数据获得几何学设计的常规方法基于水平表面下的反射镜的假设，它经常不对复杂结构合适。我们从控制照明分析开始并且为面向目标的成像提出地震调查几何学设计的一个方法。方法需要初步的地震解释获得的一个速度模型。单程的Fourier有限差别的波浪增殖者被用来外推到表面的目标层上的飞机波浪来源。由分析波浪精力，在表面的分发从需要的目标层，射击或接收装置地点外推因为目标层成像能是坚定的。用SEG-EAGE盐模型的数字测试建议这个方法为为面向目标的成像证实特殊地震获得几何学布局是有用的。关键词地震获得几何学-控制照明-面向目标的成像第一作者刘守伟是Ph。D。在Tongji大学的学生。毕业并且在2002从石油的中国大学在应用地球物理收到了一个学士学位。从那时起，他在Tongji学习了大学主修稳固的地球物理。他兴趣包括地震照明，成像和移植速度分析。

简介：Thepatternofthesubtletraps,inwhichoilandgasaccumulated,intheburied-hillfaultedzoneintheJiyangsagisverycomplicated,andveryhardtoprospect.Thepaperanalysesthemaindifficultiesinexploringthecomplicatedburied-hillfaultedzoneoftheareafromapointofgeology.Thetypicalpatternoftheburied-hillzoneintheJiyangsagisstudiedusingtheforwardmodeling.Target-orientlayoutdesignandfull3-Dseismictechnology,whichareusefulforoilandgasexplorationonthezone,areputforward.Takingtheexplorationforoilandgastrapsonthezoneasanexample,certaintechnologiesandtheeffectoftheirapplicationsaboutthedesignfortargetacquisition,acquisitiononawide-azimuth,pointsourcesandpointreceiversarediscussed.

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简介：Theprocessthattreeconeacquisitionrobotgetsconeshasbeensimulatedwiththeprocessthathumanbendsorstretcheshisarmsinsomeload.Andthentheshaftdrivingforcesimulationoftreeconeacquisitionrobotinthewordingprocesswasanalyzedaccordingtobiomechanicslawsbysystemmodelingsimulationanalysissoftwarethatisusedincurrentpopular.Theforcesoftheshaftsatshoulderjointandelbowjointoftherobotwereanalyzed,meanwhile,werecalculatedanddrewupthefiguresbyusingMaplesoftware.Finally,theanalyticalresultsverifiedthecorrectnessofthetheoryanalysiswithSolidDynamicssoftware.Andfromthestudy,thefindingsprovideimportanttheoryandparametersforimprovingthetreesconesacquisitionrobot.