简介:《斯巴达300勇士》是根据漫画大师FrankMiller的同名漫画改编的史诗巨片。公元前480年,斯巴达国王Leonidas率领300勇士,在没有祭司祝福,没有议会同意的情况下,独自前往位于斯巴达北部的温泉关(theHotGates)阻击波斯国王Xerxes的十余万大军。300勇士浴血奋战,将波斯大军阻挡在塞尔莫皮莱山口两天两夜。但由于奸细的出卖,300勇士战斗到最后一刻,在波斯大军的箭雨之下湮没在了温泉关,但希腊的各个城邦最终联合起来,勇敢地面对共同的侵略者。最后波斯被击退,希腊终于赢得了胜利。直到今天,斯巴达勇士的"荣誉,责任,光荣,作战和胜利"的信条依然感天动地,300斯巴达勇士让温泉关一役传颂千古。
简介:同位素在在地球科学跟踪并且标明日期起一个重要作用,特别87Rb-86Sr系统。与地球科学的发展,整个岩石的分析斜面足够地满足要求因为科学研究和微量分析变得越来越重要。激光脱离多收集者诱导地联合的血浆mass-spectrometry(LA-MC-ICP-MS)广泛地由于它的低样品消费在微地区的分析被使用了,高精确性在矩阵上的situ和低要求,但是当它被严重优秀辨别和集体光谱干扰的各种各样的类型限制,精确地与高Rb/Sr比率和低Sr内容特别为样品测量Sr同位素作文仍然是困难的。因而,热电离mass-spectrometry(提姆)分析同位素的比率的最精确、精确的方法,仍然是分析Sr比率的最流行的方法,特别为有低Sr内容的样品。这篇论文在low-Sr的高精确的Sr同位素分析上做系统的评论地质的样品包括微采样的技术,极端低的程序的空白的化学方法和提姆测量技术。极端低的程序的空白和提姆的联合能被用来与ng大小执行样品的高精确的微量分析,它将无疑是为Rb-Sr地球年代学,地球化学和环境研究的一个重要方向。
简介:ThenameofSRproteinsisderivedfromtheirtypicalRSdomainthatisrichinserine(Ser,S)andarginine(Arg,R).Theyareconservedinevolution.Uptonow,10membersoftheSRproteinfamilyhavebeenidentifiedinhumans.SRproteinscontainoneortwoRNAbindingmotifsasidefromtheRSdomain,andalsopossessspecialbiochemicalandimmunologicalfeatures.AstothefunctionsofSRproteins,theyfacilitatetherecruitmentofthecomponentsofsplicesomeviaprotein-proteininteractiontoprompttheassemblyofearlysplicesome;whileinalternativesplicing,tissue-specificallyexpressedSRproteinalongwiththerelativeratioofSRproteinandheterogeneousnuclearribonucleoprotein(hnRNP)iscomposedoftwomainregulativemechanismsforalternativesplicing.Almostallofthebiochemicalfunctionsareregulatedbyreversiblephosphorylation.
简介:KarstrocksfromtheHuanglongFormationexposedatthemarginoftheEasternSichuanBasincanbedividedintofourtypes:slightlycorroded,moderatelycorrodedporous,intenselycorrodedbrecciatedandintenselycorrodedandreplacedsecondarycalcickarsticrocks.Thecarbon,oxygenandstrontiumisotopecompositionsofthevariouskarstrocksareanalyzedsystematicallyandcomparedtorockswithoutkarstcorrosion.Theresultsindicatethat(1)theHuanglongFormationintheeasternSichuanBasinwasarestrictedbaysuppliedandcontrolledbyfreshwaterinwhichmudmicriteandmud-dolomicriteexhibitlowδ13Candδ18Ovaluesandhigh87Sr/86Srratios;(2)alltypesofkarsticrocksinthepaleokarstreservoirsoftheHuanglongFormationintheresearchareaareaffectedbyatmosphericfreshwaterwiththeδ13Candδ18Ovaluesand87Sr/86Srratiosintheoriginalformationapproachingthoseofatmosphericfreshwater,whichreflectsancienthydrologicalconditions,fluidproperties,isotopicsourceandthefractionationeffect;(3)theintenselycorrodedandreplacedsecondarylimestoneisaffectedbyavarietyofdiageneticfluids,oftenreflectedbyδ13Candδ18Ovalues,whilethe87Sr/86Srratiosexhibitthestrongdegreeofthecorrosion;(4)aftercomparingthe87Sr/86Srratiosofeachtypeofkarstrock,thediageneticfluidsaredeterminedtobemainlyatmosphericfreshwater,anddependingonthestrengthofcorrosion,andthelow87Sr/86Srratiofluidsinthelayerwillparticipateinthekarstprocess.Thecarbon,oxygen,andstrontiumisotopesofdifferentkarsticreservoirscanprovidemeaningfulgeochemicalinformationforforecastingandevaluatingthedevelopmentanddistributionrulesoftheHuanglongFormationatthemarginoftheeasternSichuanBasinintimeandspace.更多还原
简介: 小故事大哲学家苏格拉底的学生向他求教,怎样才能修到他那样精深的学问,苏格拉底听后并未直接作答,只是说:"我向大家倡议做一件最简单也是最容易的事,每个人尽量把胳膊往前甩,然后尽量往后甩.……
简介:公元前480年8月,骄阳炙烤着大地。一位全副武装的中年汉子站在希腊北部德摩比利隘口的山岸上,神情冷峻地眺望着海岸。他就是斯巴达国王列奥尼达。
简介:摘要:随着5G网络的部署和未来物联网时代的到来,IPv4公网地址的匮乏已经成为运营商新业务发展和大规模用户发展面临的问题,全球IPv4地址的枯竭是必须面对的实际问题。IPv6的128位地址结构包括几乎无限的地址空间网络,是解决IP地址不足的唯一方法。对网络业务进行分解,能够提炼出两种IPV6化的流量模型:一是用户应用上业务报文的IPV6化,需要对应的承载网络提供Native IPV6的报文转发能力;二是政企用户等高价值客户的VPN业务需要承载网提供IPV6化的VPN技术。其中对于Native IPV6的报文转发,各个厂商都已经能够在现网支持双栈,实现IPV4和IPV6的共存。而对于VPN业务承载的IPV6化,则需要一种方便、高效的承载协议来实现。SRv6作为传输层,能够在MPLS网络的基础之上,结合了IPv6数据平面,使隧道报文完全IPV6化。
简介:TheeffectofAl-3Ti-0.2C-5Sr(wt%)grainrefinerontherefiningperformanceandmodificationofA356alloywasinvestigatedusingopticalmicroscope(OM).ThemorphologyandcrystalstructureofternaryAl-Ti-SrphasesinAl-3Ti-0.2C-5Srrefinerwereanalyzedbyscanningelectronmicroscopy(SEM)andtransmissionelectronmicroscopy(TEM).TheresultsshowthattheternaryAl-TiSrphasesinAl-3Ti-0.2C-5SrrefinercanpromotethegrainrefiningefficiencyofA356alloy.TheternaryAl-Ti-Srphasesco-existintwomorphologies,i.e.,blocky-likephaseandsurround-likephase,besides,whichbothhavethesamechemicalcompositionofAl_(34)Ti_3Sr.ThecrystalstructureofAl_(34)Ti_3Srisface-centeredcubic,andthelatticeparameterisdeterminedtobeabout1.52nm.
简介:15%Ag-addedcubicperovskitesSr0.9La0.1TiO3andRuddlesden-Popper(RP)phasesSr2.7La0.3Ti2O7werefabricatedviahydrothermalsynthesis,coldpressingandhigh-temperaturesintering.Thestructureandthermoelectricpropertieswerealsoinvestigatedforallsamples.TheresultsindicatedthatAgprecipitatedasasecondphase.AgadditionmadeelectricalconductivityandabsoluteSeebeckcoefficientenhanced,asaresult,theZTvalueswereenhancedbothfortwoseries.Comparedwithcubicperovskite,RPphasewassubjectedtosmallerimpactbyAgaddition.ThereasonsforenhancingZTvalueandthedifferentimpactfortwoseriesbyAgadditionwerealsodiscussed.