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简介：近日，不少人被荷兰和比利时互换领土的新闻萌到了。1830年，比利时从荷兰独立，两个国家的边境一直沿着缪恩河划分。不过问题在于，在缪思河里，有一座三面环水、一面靠着荷兰的小岛，这座小岛的主权属于比利时。更糟糕的是，这座小岛还不安分，经常有毒贩之类的不法分子来这里安营扎寨——发生在比利时的地界上，荷兰警方不好管，可是比利时要过来管又很折腾，

简介：礼品客观工作到过决定中立的盐水花的影响wear抵抗上的腐蚀HVOF喷洒的NiCr-Cr3有中介的C2涂层层。Ni-Zn-Al2O3涂层当夹层被低压力准备在NiCr-Cr之间的寒冷水花(LPCS)3形成三明治结构提高腐蚀抵抗性质的C2金属陶瓷涂层。tribological性质被检验使用UMT-3fricition并且由互给滑动在下面的线接触穿测试者干燥、咸的水花一星期腐蚀。涂层的形态学，元素分发，和阶段作文并且穿sufaces被使用扫描电子分析显微镜学，精力散spectrometry，和X光检查衍射分别地。涂层的腐蚀行为被学习旁边开电路的潜力，电气化学的阻抗光谱学，potentiodynamic极化，和盐喷洒腐蚀方法。它被发现三明治组织了涂层，这有更好的腐蚀抵抗与比单个层涂层。结果表演那在下面干燥穿条件，wear机制是磨料并且粘合剂穿，而在盐水花腐蚀条件下面它成为腐蚀穿。组织的三明治的磨擦系数在盐水花腐蚀以后的涂层比干燥磨擦稍微低wear的系数，而是重量损失在干燥状况下面是比那低的。

简介：洛斯警长获得一份密报，有间谍上午10点将在政府广场一露天摊点接头，一方将交付另一方一盘存有机密数据的光碟。10点整，一名男子漫不经心地从那个摊点经过，好像一切都没有发生。不过双方已经交换了情报，你看出来了吗？

简介：天气变冷了,那就去一个暖和的地方旅行吧。看一部文艺的电影,去一个文艺的'世界尽头',关注一个新的公众号,买一本不那么文艺的书……这就是我们平日里的生活。也期待你分享给我们,属于你的那个'少女咖啡馆'。

简介：月亮镇的草地上,每月月末,都会举办一次交换节上个月交换节,猫妈妈用了一个红彤彤的苹果,从狐狸婆婆那里换来了一束漂亮的鲜花.猫妈妈把花儿放进花瓶里,多宝猫迫不及待地跑过去,闻了闻花儿,说:“这花真香呀.猫爸爸用了一顶漂亮的礼帽,从猫爷爷那里,换来了一根竹子鱼竿.这回,猫爸爸可以开心地提着桶,拿着鱼竿,到河里去钓鱼了.猫奶奶用一条漂亮的围巾,从鹅大婶那里,换来了一双鹅毛袜子.这样,猫奶奶在冬天里就可以穿上鹅毛袜子.

简介：土壤阳离子交换量（CEC）的测定在农业中有重要的意义,对农业行业标准NY/T295—1995和NY/T1121.5—2006中的离心交换法测定土壤中CEC值的方法进行了优化,讨论了不同pH值的土壤样品对两种方法的选择依据,分析了CEC值测定重现性较差的原因。结果表明,pH值的范围是方法选择的重要依据,pH〈7.0的样品适合用乙酸铵离心交换法,pH≥7.0的样品则适用乙酸钙离心交换法。优化后方法的准确度和精密度有了较大的改善,实验中对各步骤的优化缩短了约40%的操作时间,减少工作量,适合于批量样品的准确测定。

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简介：Theperfectlymatchedlayer(PML)isaneffectivetechniquefortruncatingunboundeddomainswithminimalspuriousreflections.Afluidparabolicequation(PE)modelapplyingPMLtechniquewaspreviouslyusedtoanalyzethesoundpropagationprobleminarange-dependentwaveguide(LuandZhu,2007).However,LuandZhuonlyconsideredastandardfluidPEtodemonstratethecapabilityofthePMLanddidnottakeimprovedone-waymodelsintoconsideration.Theyapplieda[1/1]Padéapproximanttotheparabolicequation.Thehigher-orderPEsaremoreaccuratethanstandardoneswhenaverylargeanglepropagationisconsidered.Asforrange-dependentproblems,thetechniquestohandletheverticalinterfacebetweenadjacentregionsaremainlyenergyconservingandsingle-scattering.Inthispaper,thePMLtechniqueisgeneralizedtothehigherorderelasticPE,asistothehigherorderfluidPE.Thecorrectionofenergyconservingisusedinrange-dependentwaveguides.Simulationismadeinbothacousticcasesandseismo-acousticcases.Range-independentandrange-dependentwaveguidesarebothadoptedtotesttheaccuracyandefficiencyofthismethod.ThenumericalresultsillustratethataPMLismuchmoreeffectivethananartificialabsorbinglayer(ABL)bothinacousticandseismo-acousticsoundpropagationmodeling.

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简介：Verticallyexploringthecharacteristicsofthetyphoonboundarylayer(TBL)playsanimportantroleinrecognizingtyphoonstructure.TheboundarylayerradialdirectionandtangentialwindcharacteristicsofTyphoonUsagibasedontheobservationaldataofthreeboundarylayerwindprofilerstationsalongtherouteofTyphoonUsagi(No.1319)andbycombiningwithsoundingdata.Theresultsshowthat:(1)maximumtangentialwindappearsinthevicinityoftheeyeareaofUsagi,anditbasicallymaintainsaheightofaround1800mwhenUsagikeepsastrongtyphoonlevel,withtherapidlydecreasingstrengthofUsagiafteritlands,thespeedofthemaximumtangentialwindanditsverticalrangebothdecrease;(2)theheightofthemaximumtangentialwindisclosetothatoftheinflowlayertopofthetyphoon,andisgreaterthanthatoftheboundarylayerestimatedonthebasisofRichardsonnumberorpotentialtemperaturegradient,whiletheheightofmixedlayerjudgedonthebasisofthesignal-to-noiseratio(SNR)oritsgradientisusuallylow;(3)thetheboundarylayerheightcanreachhigherthan2100mbeforeUsagilands.Whenthetyphoonleveloraboveisachieved,theboundarylayerheightobservedbyvariousstationsdoesnotchangemuch,basicallystayingatbetween1200and1600m.WiththedecreasingstrengthofUsagiafteritslandfall,theboundarylayerheightrapidlydrops.

简介：Background:Understoryplantsrepresentsthelargestcomponentofbiodiversityinmostforestecosystemsandplaysakeyroleinforestfunctioning.Despitetheirimportance,theinfluenceofoverstory-layercompositiononunderstoryplantdiversityisrelativelypoorlyunderstoodwithindeciduous-evergreenbroadleavedmixedforests.Theaimofthisworkwastoevaluatehowtreeoverstory-layercompositioninfluencesonunderstory-layerdiversityinthreeforesttypes(monospecificdeciduousNothofaguspumilio(Np),monospecificevergreenNothofagusbetuloides(Nb),andmixedN.pumilio-N.betuloides(M)forests),comparingalsobetweentwogeographicallocations(coastandmountain)toestimatedifferencesatlandscapelevel.Results:Werecorded46plantspecies:4ferns,12monocots,and30dicots.Canopy-layercompositioninfluencestheherb-layerstructureanddiversityintwodifferentways:whilemixedforestshavegreatersimilaritytoevergreenforestsintheunderstorystructuralfeatures,deciduousandmixedweresimilarintermsofthespecificcompositionofplantassemblage.Deciduouspurestandswerethemostdiverse,meanwhileevergreenstandswereleastdiverse.Lackofexclusivespeciesofmixedforestcouldrepresentatransitionwhereevergreenanddeciduouscommunitiesmeetandintegrate.Moreover,landscapehasamajorinfluenceonthestructure,diversityandrichnessofunderstoryvegetationofpureandmixedforestslikelyassociatedtothemagnitudeandfrequencyofnaturaldisturbances,wheremountainforestnotonlyhadhighestherb-layerdiversitybutalsomoreexclusivespecies.Conclusions:OurstudysuggeststhatmixedNothofagusforestsupportscoexistenceofbothpuredeciduousandpureevergreenunderstoryplantspeciesanddifferentassemblagesincoastalandmountainsites.Maintainingthemixtureofcanopypatchtypeswithinmixedstandswillbeimportantforconservingthenaturalpatternsofunderstoryplantcompositioninsouthernbeechmixedforests.

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简介：摘要电力调度系统作为电力安全生产的重要保障,面临更高的语音、视频、数据等业务相融合的智能调度需求,调度软交换系统也成为电力通信发展的必然趋势。在程控交换方式的电力调度现状下,如何良好地过渡到基于软交换技术的新一代电力调度是值得探讨的。文章结合当前软交换系统在电力行业中的应用,对基于软交换技术的电力调度系统的功能、组网方案和承载建设、性能及互联互通的现状和发展作出了全面分析,并提出相应的建议来帮助构建下一代电力调度系统。

简介：在新课程改革大背景下，笔者所在学校于2015年就开展了体育足球课程建设活动，旨在为体育课程输入新鲜血液，激活孩子们的学习动力与兴趣。校本体育2+X课程建设带来的是笔者所在学校体育课程的变革，也是体育课堂的变革。本文着重谈校本足球课程带来四大方面的育人功能一是运动兴趣为学生学习足球课程带来浓厚的学习热情；二是创新多元评价为学生带来更丰富的课程体验；三是体育足球课程为学生带来身心健康；四是体育足球

简介：摘要本文以东莞轨道交通2号线信号联锁功能测试为背景，重点对联锁功能测试内容及步骤、安全注意事项进行了详细说明。为后续新建线路组织信号系统联锁功能测试提供借鉴。

简介：Nonlinearinteractionsofthetwo-dimensional(2D)secondmodewithobliquemodesarestudiednumericallyinaMach6.0flat-plateboundarylayer,focusingonitsselectiveenhancementeffectonamplificationofdifferentobliquewaves.Evolutionofobliquemodeswithvariousfrequenciesandspanwisewavenumbersinthepresenceof2Dsecondmodeissimulatedsuccessively,usingamodifiedparabolizedstabilityequation(PSE)method,whichisabletosimulateinteractionoftwomodeswithdifferentfrequenciesefficiently.Numericalresultsshowthatobliquemodesinabroadbandoffrequenciesandspanwisewavenumberscanbeenhancedbythefiniteamplitude2Dsecondmodeinstabilitywave.Theenhancementeffectisaccomplishedbyinteractionofthe2Dsecondmode,theobliquemode,andaforcedmodewithdifferencefrequency.Twotypesofobliquemodesarefoundtobemoreamplified,i.e.,obliquemodeswithfrequencyclosetothatofthe2Dsecondmodeandlow-frequencyfirstmodeobliquewaves.Eachofthemmaycorrespondtoonetypeoftransitionroutesfoundintransitionexperiments.Thespanwisewavenumberoftheobliquewavepreferredbythenonlinearinteractionisalsodeterminedbynumericalsimulations.

简介：MoS_2,MoSe_2andWSe_2thinflakeswerefabricatedbythestandardmicromechanicalcleavageprocedures.ThethicknessandtheopticalcontrastoftheatomicthindichalcogenideflakesonSiO_2/Sisubstratesweremeasuredbyatomicforcemicroscopy(AFM)andspectroscopicellipsometer.Arapidandnondestructivemethodbyusingreflectionspectrawasproposedtoidentifythelayernumberof2DlayeredtransitionmetaldichalcogenidesonSiO_2(275nm)/Sisubstrates.Thecontrastspectraof2DnanosheetswithdifferentlayernumbersareinagreementwiththeoreticalcalculationsbasedonFresnel'slaw,indicatingthatthismethodprovidesanunambiguousandnondestructivecontrastspectrafingerprintforidentifyingsingle-andfew-layeredtransitionmetaldichalcogenides.Theresultswillgreatlyhelpinfundamentalresearchandapplication.

简介：摘要电力通信网主要是为了保证电力系统的安全稳定运行，它是电网调度自动化、网络运营市场化和管理现代化的基础，也是是电力系统的重要基础设施。软交换技术作为一种全新的电信交换模式，以其先进、快捷、稳定、安全等特点在电力通信网中开始应用。在基于软交换技术智能电网电力通信系统中，通信人员可以主动了解和掌握各职能部门和需求侧电力用户功能需求，便于其制定高效可靠的调度运行决策，进而为他们提供综合的、完善的、高附加值的实时优质服务。

简介：税收情报交换在保障税收协定正确执行、维护税收管辖权和遏制国际税收有害竞争等方面起到积极的作用,是当前最有效、被各国采用最多的税收征管合作手段。基于对我国税收情报制度的探究,提出一系列优化措施,保障国家税收主权和利益。