简介：综述了Molar-Tooth的时空分布及其形态特征．Molar-Tooth为元古代时期全球性的一种构造现象．其成因，地质学家们已争论了一个多世纪，直到今天还未取得一致的认担．归纳前人的研究成果，初步坠为Molar-Tooth的成因与藻类等生物活动有关．

简介：与在关于的研究的进步一起前寒武纪，Molar-toothcarbonates(作为MT，或microsparite碳酸盐或MT结构简化了)它被形成在theMiddle迟了最近原生地成为了一个风骚的题目。原生地臼齿牙齿(MT)碳酸盐岩石指那些中央--到Neoproterozoic(1600-650妈)，有MT的碳酸盐组织，即，一系列古怪，ptygmatically合拢了并且在前寒武纪的年龄的有细密纹理的碳酸盐的充满圆材的裂缝，在环境定位了中间--到内部斜面和浅站台。山象与器官的连接无机的世界的一座桥一样，是仔细与paleo海洋，空气和生物圈的进化有关。他们与生命起原和海洋的碳酸盐的沉积地球化学事件的分离有关的发展或衰退are/is。由足够地使用现代仪器和严峻的方法，在沙岩的氧化物的内容我们remeasured和REE分发模式曲线被建立；~(87)的同位素的比率的精确价值Sr/~(86)Sr被获得，也就是说MT形成的年龄在附近750-900妈；一些新鲜micrite石灰石样品的C和Oisotopes被分析；，精力光谱分析至于它的化学成分表明MT主要由micros同等方解石组成，矩阵显示出Ca，Mg，艾尔，Si，和K的突出的山峰。geochemical证明在吉林辽宁区域的thatNeoproterozoicMT碳酸盐在一个稳定的大陆的边缘被开发，在paleo温度是大约50℃的炽热的地区，当MT在东方辽宁在南部的吉林并且在YingchengziandXingmincun时期期间在Wanlong时期期间被形成时，海水有正常咸度。沉积环境位于内部斜面。在摘要，理解MT的起源是很重要的，查明thepaleo气候和paleo环境特征，抑制年龄和stratigraphicdivision和比较原生地以便学习MTcarbonates和他们的形成环境的geochemical特征。

简介：尽管它的起源到目前为止还没到达了一致，山(臼齿牙齿的结构)被记录超过100年了。从MesoproterozoicWumishan形成，Lingyuan，Yanshan区域，诺思中国，和特征和山的地质的含意的山的发现是进一步的当前的学习报告讨论了。这里，山的出现的straitigraphic地平线证明它主要位于Wumishan形成的最高的部分以内，即，石灰石单位。山的四种形态学，即，好纺锤形，碎片，带子，ptigmatic并且榴状(不规则)，被认出并且想了是高度与沉积环境和外形有关。包括氧化物，踪迹元素和C，O和Sr同位素的山的地球化学显示地平线忍受山具有比稀罕的山的邻近的stratigraphic层次的更高的Sr/Ba和Ca/Mg比率，更低的积极13C和高度否定的18O价值岩性学，在Wumishan形成的山的形态学和地球化学建议山主要在浅subtidal发生在暴风雨波浪底附近，它被温暖的温度典型地描绘，oversaturated钙碳酸盐海水并且嗨而且，这里的水藻细菌的偶尔的丰富是为钙淤泥的石灰化有利、为Wumishan形成的山C同位素作文催化的更多，这的山学习很好与Mesoproterozoic带超群，北美洲和Riphean的被相关，西伯利亚，建议山充当对全球变化作出回应的一个沉积记录并且是在前寒武纪的stratigraphic的完美的指示物世界范围的关联。

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简介：Withinthenervoussystem,regenerationislimited,andthisisduetothesmallamountofneuralstemcells,theinhibitoryoriginofthestemcellnicheandoftentothedevelopmentofascarwhichconstitutesamechanicalbarrierfortheregeneration.Regardingtheseaspects,manyeffortshavebeendoneintheresearchofacellcomponentthatcombinedwithscaffoldsandgrowthfactorscouldbesuitablefornervousregenerationinregenerativemedicineapproaches.Autologousmesenchymalstemcellsrepresentnowadaystheidealcandidateforthisaim,thanktotheirmultipotencyandtotheiramountinsideadulttissues.However,issuesintheirharvesting,throughtheuseofinvasivetechniques,andproblemsinvolvedintheirageing,requiretheresearchofnewautologoussources.Tothispurpose,therecentdiscoveryofastemcellscomponentinteeth,andwhichderivefromneuralcrestcells,hascametothelightthepossibilityofusingdentalstemcellsinnervoussystemregeneration.Inthiswork,inordertogiveguidelinesontheuseofdentalstemcellsforneuralregeneration,webrieflyintroducetheconceptsofregenerationandregenerativemedicine,wethenfocustheattentiononodontogenesis,whichinvolvestheformationandthepresenceofastemcomponentindifferentpartsofteeth,andfinallywedescribesomeexperimentalapproacheswhichareexploitingdentalstemcellsforneuralstudies.

简介：Mammaliantoothdevelopmentislargelydependentonsequentialandreciprocalepithelial-mesenchymalinteractions.Theseprocessesinvolveaseriesofinductiveandpermissiveinteractionsthatresultinthedetermination,differentiation,andorganizationofodontogenictissues.Multiplesignalingmolecules,includingBMPs,FGFs,Shh,andWntproteins,havebeenimplicatedinmediatingthesetissueinteractions.Transcriptionfactorsparticipateinepithelial-mesenchymalinteractionsvialinkingthesignalingloopsbetweentissuelayersbyrespondingtoinductivesignalsandregulatingtheexpressionofothersignalingmolecules.Adultstemcellsarehighlyplasticandmultipotent.Thesecellsincludingdentalpulpstemcellsandbonemarrowstromalcellscouldbereprogrammedintoodontogenicfateandparticipatedintoothformation.Recentprogressinthestudiesofmolecularbasisoftoothdevelopment,adultstemcellbiology,andregenerationwillprovidefundamentalknowledgefortherealizationofhumantoothregenerationinthenearfuture.

简介：Distinguishingwithtraditionaltoothprofileofspiralbevelandhypoidgear,itproposedanewtoothprofilenamelythesphericalinvolute.Firstly,anewtheoryofformingthesphericalinvolutetoothprofilewasproposed.Then,thistheorywasappliedtocompleteparametricderivationofeachpartofitstoothprofile.Forenhancingtheprecision,theSWEEPmethodusedforformationofeachpartoftoothsurfaceandG1stitchingschemaforobtainingaunifiedtoothsurfaceareputforwardandmadetheapplicationintheaccuratemodeling.Lastly,owingtothehigheraccuracyoftoothsurfaceofoutputtedmodel,itgavesomeoptimizationapproaches.Givennumericalexampleaboutthemodelcanshowthatthisdesignedgearwithsphericalinvolutetoothprofilecanachievefastandaccurateparametricmodelingandprovideafoundationfortoothcontactanalysis(TCA)indigitizeddesignandmanufacture.更多还原

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简介：Toothextractionwasperformedin60casesunderdigitalacupointpressureanes-thesiawitharemarkablecurativeeffect.Thecurativeeffectwashigherforlooseteeth.Theeffectiveratewas100%.Thetoothextractionunderdigitalacupointpressureanesthesiahasmanyadvantages.Toothextractioncanbeperformedonlybypressingacertainacupointwithsafety,convenienceande-conomy.Themethodavoidsthesideeffectsofnarcoticandreducesthepatient’sfearofaninjectionofnarcotic.

简介：Excessmolarvolume(VE)dataonbinaryliquidmixturesofmethylheptenone(MHO)withmethanol,ethanol,n-propanolorn-butanolhavebeendeterminedfromthedensitymeasurementsat298.15Kandatmosphericpressure.ThevaluesofVEinallthesystemsovertheentirecompositionrangearequantifiedbytheRedlich-Kisterequation.TheeffectsofthechainlengthofalkanolsonVEarediscussed.

简介：Thisstudyhighlightsthejointeffectofearlypolymerizationshrinkageandlongtermmoisturediffusiononthebehavioroftherestoration-toothstructure.Theinterphasedebondingbetweenparticleandpolymerresinindentalcompositeistakenintoaccountbyintroducingthedamagevariable.Theidealizedmodelisdesignedandconstructedforrepresentingtherestorationtoothstructure,whichconsistsofenamel,dentin,compositeandinterphase,eachconsideredashomogenousmaterial.Thesimulationiscarriedoutusingthegeneral-purposefiniteelementsoftwarepackage,ABAQUSincorporatedwithausersubroutinefordefinitionofdamagedmaterialbehavior.TheinfluenceofYoung'smoduliofcompositeandinterphaseonstressanddisplacementisdiscussed.Thecompensatingeffectofwatersorptiononthepolymerizationshrinkageisexaminedwithandwithoutinvolvingdamageevolution.Acomparisonismadebetweentheinfluenceofhyper-,equi-andhypo-watersorption.Interfacialfailureinthespecificregionsaswellascuspalmovementhasbeenpredicated.Thedamageevolvingindentalcompositereducestherigidityofcomposite,thusinturnreducingconsequentstressandincreasingconsequentdisplacement.Thedevelopmentofstressesattherestoration-toothinterfacecanhaveadetrimentaleffectonthelongevityofarestoration.

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简介：人体词＂牙/齿＂,对应的英文词＂tooth＂,基本义指称人体重要的部位之一。在漫长的语言演变过程中,主要借助隐喻和转喻的作用下,构成了一个连续统一的语义转移系统——基于突显和邻近原则的转喻所指：＂年龄、口味、言语、情感＂;基于形貌相似的隐喻所指：＂齿状物＂;基于隐喻转喻互动的隐转喻所指：＂战争＂。这说明了英汉民族某些共同的身体体验决定了认知的相通性。同时,在英汉民族思维中牙齿的言语交际功能都占有很突显的地位,汉民族还注重牙齿的外貌特征。

简介：Reasonabledenturedesignwillaffectthehealthoforalsupportingtissueandrelatetothesuccessandfailureofprosthodontic.Inordertoinvestigatethestressdistributeoforalsupportingtissueswiththreevariousdesignsunderconditionsofverticalloading,wemeasuredthemodelofthelossoflowerfirstmolarwith3-Dco-ordinatemeasuringapparatus,anddidanaloguedenturedesignwithauto-CADsoft-waresystemincomputer.AllmodelswereanalyzedwithSuper-SAPfiniteelementprogram.Ineachcase,150Nverticalloadingwasappliedonthesecondpremolar,

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简介："Whitepowderytungsticacid"hasbeenusedforpreparingvarioustypesoftungsten-containingcompoundsduetoitshighreactivity.Thepresentpapercoversthestandardmolarenthalpiesofformation,△H0/fofthreetungsten-containingacids.Thevaluesfoundfor"whitepowderytungsticacid"WO3·1.68H2O,"yellowtungsticacid"WO3·1.20H2OanddodecatungstophosphoricacidH3(PW12O40)·25H2Oat298.15Kwere-(1312±1),-(1192±1)and-(18150±13)kJmol-1,respectively.

简介：沙东南构造带是在渤海湾裂谷盆地背景上演化而来的,发育有3个面积较大的圈闭,是油气聚集的有利地区。本文分别对研究区的构造演化特征、断裂期次划分及圈闭构造样式进行了详细研究,依据活动期次将断裂分为早期活动断裂、晚期活动断裂和长期活动断裂,指出长期活动断裂对该区成藏具有重要意义,从而为有利圈闭和油气藏评价提供了重要依据。

简介：　　数年前,一个温暖冬日,一位近年走红的青年雕塑家对我说道:"中国的美术院校雕塑系实际上是泥塑系或者说是雕刻系."此话让我有点吃惊,深居京城院校尚不得知,大有不识庐山面目之感,仔细想来,并非戏言.涉及到此,也感困惑,还有痛苦.……

简介：<正>本课程使用的教材为李祯祥主编的《房屋建筑学》上册和林恩生主编的下册。是建施专业的一门主课,内容广泛涉及建筑构造和建筑设计两大部分,上册以民用建筑为主,下册则以工业建筑为主。复习的重点以掌握建筑构造原理和方法为主,熟悉绘制节点大样图和平、剖面图,辅以了解有关建筑设计的基本知识。教材中的作业和思考题应认真完成。考试题型有名词解释、填空、简答和绘图说明题等。