简介:Determiningthephysicalandmechanicalpropertiesofsoilanditsbehaviorforengineeringprojectsisessentialforroadconstructionoperations.Oneofthemostimportantprinciplesinforestroadconstruction,whichisusuallyneglected,istoavoidmixingorganicmatterwithroadmaterialsduringexcavationandembankmentconstruction.Thecurrentstudyaimedtoassesstheinfluenceoforganicmatteronthephysicalpropertiesandmechanicalbehaviorsofforestsoilandtoanalyzetherelationbetweentheamountoforganicmatterandthebehaviorofforestsoilasroadmaterial.Atypicalsoilsamplefromthestudyareawascollectedbesideanewlyconstructedroadbed.Thesoilwasmixedwithdifferentpercentagesoforganicmatter(controltreatment,5,10,and15%bymass)anddifferenttestsincludingAtterberglimits,standardcompaction,andCaliforniabearingratio(CBR)testswereconductedonthesedifferentsoilmixtures.Theresultsshowedthatsoilplasticityincreasedlinearlywithincreasingorganicmatter.Increasingtheorganicmatterfrom0%(control)to15%resultedinanincreaseof11.64%oftheplasticlimitand15.22%oftheliquidlimitafterdryingat110℃.Also,increasingtheorganicmattercontentreducedthesoilmaximumdrydensityandincreasedtheoptimummoisturecontent.Increasingtheorganicmatterfrom0to15%resultedinanincreaseof11.0%oftheoptimummoisturecontentandadecreaseof0.29g/cm3ofthemaximumdrydensity.OrganicmatterdecreasedtheCBR,whichisusedastheindexofroadstrength.Adding15%organicmattertothesoilresultedinadecreaseoftheCBRfrom15.72to4.75%.Therewasasignificantdifferencebetweenthetwodryingtemperatures(60and110℃)forthesameorganicmattermixtureswithlowerwatercontentvaluesafterdryingat60℃.Theresultsrevealedtheadverseinfluenceoforganicmatteronsoilengineeringpropertiesandshowedtheimportanceoforganicmatterremovalbeforeexcavationandfillconstruction.
简介:Intensevisibleemissionsfromdysprosium(Dy3+)ionsdopedglassesbecameprospectivefordiversetechnologicalapplications.Inthispaper,physical,opticalandstructuralpropertiesofmagnesiumborateglassesdopedwithvariedconcentrationsofDy2O3wereexamined.Suchglassesweresynthesisedbymeltquenchingmethodandcharacterizedatroomtemperatureusingseveralanalyticaltechniques.Luminescenceandabsorptionspectra(inthevisibleregion)ofas-quenchedsampleswereusedtoevaluatethephysicalandopticalproperties.XRDpatternconfimstheamorphousstateofas-quenchedsamples.TheFouriertransforminfrared(FTIR)spectraofglassesrevealvariousbondingvibrationsassignedtodifferentfunctionalgroups.UV-vis-NIRspectradiscloseeightabsorptionbandsaccompaniedbyabandforhypersensitivetransitionpositionedat1260nm(6H15/2→6F11/2).ThevaluesofdirectandindirectopticalenergybandgapofthestudiedglassesaredecreasedwiththeincreaseofDy3+ioncontents.Thephotoluminescencespectraofallglassesundertheexcitationof380nmdisplaytwoprominentemissionbandscentredat497nm(4F9/2→6H15/2,blue)and587nm(4F9/2→6H13/2,green).Theachievedintenseluminescencefromtheproposedglasscompositionmaybebeneficialforsolidstatelaserapplications.
简介:Dr.NeilLotantin,thehonorarypresidentoftheHarvardUniversity,oncesaid,“Weshouldweakentheprofessionaltrainingofuniversities,butstrengthenthehumanitieseducationofcollegestudents.”Infact,underthebackgroundofhighereducationinhighereducation,thecultivationofstudents’excellenthumanisticqualityshouldbebasedonthecultivationoftechnicalability,whichisthebasiccoreofthecurrentqualityeducation.Thispapermainlystudiesthehumanisticqualityeducationofcollegephysicaleducationstudents,pointsouttheinfluencingfactorsaffectingtheconnotationoftheirhumanisticqualityeducation,andputsforwardcorrespondingcountermeasures,hopingtodevelopanewwayforcollegesportsmajorstoeffectivelycarryoutthecorrecthumanisticqualityeducation.
简介:没有已知的州的方程,新州的评价策略被设计对为电子的恶意的攻击是物理系统。由数据重建的想法启发了,(CS)压缩察觉到基于系统状态的Markov图在察觉和鉴定计划以后被用于剩余大小的重建,它对欺骗攻击增加州的评价策略的跳回。首先,observability分析被介绍从攻击决定测量重建和损坏水平的被触发的时间。特别地,学习的字典被建议由K单个的值分解(K-SVD)形成过去完成的字典,它根据测量数据的特征适应地被生产。由于剩余大小的不规则,另外,一个采样矩阵作为测量矩阵被设计。最后,模拟实验在6公共汽车力量系统上被执行。大小的重建被建议重建方法完成很好的结果表演,和相应效果分别地基于联合字典和传统的高斯或Bernoulli随机的矩阵比重建计划好。特别,当仅仅29%可得到的干净大小是左的时,建议策略的性能仍然是非凡的,它为五种恢复算法反映概论。
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简介:摘要基于USB的车辆测试数据传输系统的原设计方案不便于跨操作系统平台应用。无法实现与计算机和外接USB存储设备的双向通信、驱动安装、偶尔故障等。针对上述问题,本文提出了一种车辆测试数据传输系统驱动免费USB主从的设计方法。该方法以USB接口芯片CH378为核心设计USB主从传输系统,通过特殊的USB主从状态电路,通过嵌套USB2实现USB主从模式的自动切换。0协议、USBMassStorage协议、FAT32文件系统协议实现了无需驱动即可获取测试数据的功能。本文主要介绍了新型车辆测试数据传输系统的总体设计方案、CH378硬件接口电路、USB主从状态电路以及USB从模式下的无驱动功能的实现。通过实验验证,本设计可以实现了车辆测试数据传输系统的免驱动USB主从功能,为车辆测试数据传输系统的应用和维护带来了方便。
简介:摘要铁路运输是我国重要的运输方式之一,随着我国经济的不断发展以及人民生活水平的提高,对运输的要求提出了越来越高的要求。而随着科学技术的日益完善,高速铁路应运而生,高速铁路的里程数越来越高。其重要性正日益凸现出来。高速铁路的建设是一个复杂、巨大的工程,涉及多个参与方,出现了大量的接口问题,为此管理各种形式的接口问题成为高速铁路建设管理的重要关键环节之一,因此对高速铁路项目的施工接口进行有效管理是十分有必要的。
简介:摘要在数控系统或装置中,强电与弱电相互影响。强电对弱电会形成干扰,弱电与强电也能形成有机结合。本文主要论述信号采集时的强弱电之间相互转换,以及对强弱电的隔离和处理方法,数控设备的运行和维修,强电分别作为内部干扰和外部干扰时如何应对。