简介：如果对于不小于8的自然数n，3n+1是一个完全平方数时，n+1都能表示成k个完全平方数的和，求k的值．

简介：据财政部国库司统计，2003年在1659．4．亿元的全国政府采购规模中，省内合同额为1079．7亿元(占全国政府采购额的65％)，省外合同额为316．8亿元。省内与省外合同是指一个省(市)内获得政府采购工程和服务合同的供应商为省(市)内还是省(市)外供应商，以及货物合同的产品来自省(市)内还是省(市)外。该指标反映地区市场的开放程度和地区间的竞争能力。

简介：ApossiblemechanismisputforwardinthispaperforElNinoeventsfromtheviewpointofplatetec-tonicsandoceanicgeology.Anumberofthedataarecitedtoillustratetheviewsthatsea-bottomvolcanicac-tivitiesandhotspringsmaycauseElNinoevents.

简介：ElNinoaswellastheSouthernOscillationisoneofthestrongestsignalsknownsofaroverclimaticnoiseininterannualvariationsoftheatmosphereandoceans.Agreatnumberofstudieshaveshowndefinitelyrelationshipsbe-tweentheeventsandclimaticanomaliesinChina.Inthisreview,observationalresultsobtainedintherecentseveralyearsarefirstsummarized.ThenthepossiblephysicalmechanismsontheinfluenceofElNinoarepresentedand,finally,theassociatedproblemsarediscussed.

简介：Inthispaper,byusingspectralmethod,themonthly-andseasonal-scaleatmosphericdiabaticheatflow(ADHF)departurefieldsarediagnosedintheperiodof1964—1985with6ElNinoyearsand6anti-ElNinoyearsovertheNorthernhemisphere(NH).TheresultsshowthatElNinophenomenahavepronouncedinfluenceontheADHFdepar-turefields.Theresponseofatmosphereexhibitsapreferredarrangementoforganizingpositiveandnegativedeparturecentersatlow,middleandhighlatitudes.Inanti-ElNinoyears,theresponsehasthesameformsasinElNinoyears,butdeparturecentersareoppositeinphase.Furthermore,ADHFdepartureshowslow-frequencyoscillationinElNinoyearsandanti-ElNinoyears.ThecenterofdifferenceindeparturebetweenElNinoandanti-ElNinoyearsdisplaysabi-monthlyoscillation.Finally,throughair-seacorrelationanalysis,itispointedoutthattheSSTanomalyisthemostimportantcauseforADHFanomaly.

简介：OnthebasisofNOAA/CPCdataofseasurfacetemperatureanomalyintheNinoregionsduringJan.1950-Dec.2003,thewaveletpowerspectrumofSSTwerestudiedwithsignificanceandconfidencetestingatdifferentscalesinthispaper.ItshowsthattheSSTareprovidedwithmulti-timescalesstructurenestedoneanother,andvaryonscalesof2-7years,8-20yearsand＞30years.Themostsignificantvariationofthewarmandcoldepisodesisinthe4-yearbandofperiod.Thepower,frequencystructureandconfidenceofthesameepisodearedifferentindifferentNinoregions.TheintensityofoscillationsisincreasingatlowfrequencybandsanddecreasingathighfrequencybandsfromeasttowestintheNinoregions,especiallyafter1970.

简介：Inthispaper,theinfluenceofElNi?oeventontheMadden-JulianOscillation(MJO)overtheequatorialPacificisstudiedbyusingreanalysisdataandrelevantnumericalsimulationresults.ItisclearlyshownthatElNi?ocanreducetheintensityofMJO.ThekineticenergyofMJOovertheequatorialPacificisstrongerbeforetheoccurrenceoftheElNi?oevent,butitisreducedrapidlyafterElNi?oeventoutbreak,andtheweakenedMJOevencancontinuetothenextsummer.Theconvectionoverthecentral-westernPacificisweakenedinElNi?owinter.ThepositiveanomalousOLRoverthecentral-westernPacifichasoppositevariationinElNi?owintercomparingtothenon-ENSOcases.TheverticalstructureofMJOalsoaffectedbyElNi?oevent,sotheoppositedirectionfeaturesofthegeopotentialheightandthezonalwindinupperandlowerleveltropospherefortheMJOarenotremarkableintheElNi?owinterandtendtobebarotropicfeatures.ElNi?oeventalsohasaninfluenceontheeastwardpropa-gationoftheMJOtoo.DuringElNi?owinter,theeastwardpropagationoftheMJOisnotsoregularandunanimousandthereexistssomeeastwardpropagation,whichisfasterthanthatinnon-ENSOcase.DynamicanalysessuggestthatpositiveSSTA(ElNi?ocase)affectstheatmosphericthicknessovertheequatorialPacificandthentheexcitedatmosphericwave-CISKmodeisweakened,sothattheintensityofMJOisreduced;thecombiningofthebarotropicunstablemodeintheatmosphereexcitedbyexternalforcing(SSTA)andtheoriginalMJOmaybeanimportantreasonfortheMJOverticalstructuretendingtobebarotropicduringtheElNi?o.

简介：2017年全球经济走势如何，国际货币基金组织（IMF）在其最新一期的《世界经济展望》报告中指出，2017年全球经济增速预计为3．4％。IMF首席经济学家莫里斯·奥布斯特费尔德表示，全球经济仍面临下行风险。经济持续低速增长，多数国家贫富差距加大，这将加剧反贸易、

简介：过去20年，我国制造业的飞速发展是靠着材料的粗加工和终端产品的组装。但在这两个环节的发展，中国整体上走的是原生资源的路子，是以大量资源和能源的高消耗为代价的，我们走的是最低端的一条路线。而在发达国家，循环经济逐步受到重视，欧洲现在开始走再生资源这条路。

简介：中国烹饪协会会长姜俊贤近日表示，2016年中国餐饮收入预计将达3.4万亿元至3．5万亿元。第四届中国顶级烹饪大师技艺交流会日前在天津举行。姜俊贤在会上表示，中国餐饮业经过近3年调整，供给侧改革成效初显；从去年下半年开始，基本上恢复到正常的水平，即收入呈两位数环比增长、在社会消费品零售总额中占比超过10％。

简介：IthaslongbeenacknowledgedthattherearetwotypesofElNioevents,i.e.,theeasternPacificElNio(EE)andthecentralPacificElNio(CE),accordingtotheinitialpositionoftheanomalouswarmwateranditspropagationdirection.Inthispaper,theoceanicandatmosphericevolutionsandthepossiblemechanismsofthetwotypesofElNioeventswereexamined.ItisfoundthatalltheElNioevents,CEorEE,couldbeattributedtothejointimpactsoftheeastwardadvectionofwarmwaterfromthewesternPacificwarmpool(WPWP)andthelocalwarmingintheequatorialeasternPacific.BeforetheoccurrenceofCEevents,WPWPhadlongbeeninastateofbeinganomalouswarm,sothestrengthofeastwardadvectionofwarmwaterwasmuchstrongerthanthatofEE,whichplayedamajorroleintheformationofCE.WhilefortheEEevents,mostcontributioncamefromthelocalwarmingoftheequatorialeasternPacific.ItisfurtheridentifiedthattheimmediatecauseleadingtothedifferenceofthetwotypesofElNioeventswastheasynchronousvariationsoftheSouthernOscillation(SO)andtheNorthernOscillation(NO)asdefinedbyChenin1984.WhenthetransitionfromthepositivephaseoftheNO(NO+)toNO-waspriortothatfromSO+toSO-,therewouldbeeastwardpropagationofwesterlyanomaliesfromthetropicalwesternPacificinducedbyNOandhencethegrowthofwarmseasurfacetemperatureanomaliesinWPWPanditseastwardpropagation.ThiswasfollowedbylaggedSO-inducedweakeningofsoutheasttradewindsandlocalwarmingintheequatorialeasternPacific.ThesewereconducivetotheoccurrenceoftheCE.Onthecontrary,thetransitionfromSO+toSO-leadingthetransitionofNOwouldfavortheoccurrenceofEEtypeevents.

简介：WestatisticallyanalyzethetropicaltyphoonformingintheSouthChinaSeaanduseTC(TropicalCyclone)forshortinthefollowing)bytyphoonyearbook.Thetyphoonquantityisverydifferentindifferentmonthsandyears.TCappearsinallmonthsexceptMarch,andthemostTCquantityinayearis11,theleastis1and6.2onaverage.ThemostTCquantityinamonthis5andtheleastis0.TClandsmostinAugustandnoTClandsonChinesecontinentfromDecembertothefollowingApril.TheprimarylandingareaisbetweenShantouandHainanIsland.ThesustainingperiodofTCisusuallybetween4daysto7days,andthelongestis19days.Only15%oftheTCformingintheSouthChinaSeacanintensifytotyphoon,andtheyallformintheoceanareadeeperthan150m.TheSouthChinaSeaistheoceanareaoverwhichtheTCoccursfrequently.

简介：采用Harvard目录中1977－1994年及1960－1993年间的地震有关参数，由Dahlen理论和Lam-beck推出的有关公式估计了地震引起地球轴向惯性矩的累积变化，分析了地震和ElNino事件之间的联系，特别是震级大于5级地地震引起的位错所产生的地球轴向惯性矩的变化会有一个跳跃，这个跳跃的ElNino事件有着很好的对应关系。

简介：Ｃｈａｒａｃｔｅｒｉｓｔｉｃ　ｍｏｄｅｍｏｄｅｌ　ｏｆ　ｔｒｏｐｉｃａｌ　Ｐａｃｉｆｉｃ　Ｏｃｅａｎ　ａｎｄ　ｄｙｎａｍｉｃ　ｍｅｃｈａｎｉｓｍ　ｏｆ　Ｅｌ　ＮｉｎｏＺｈａｎｇＸｉａｎｇｄｏｎｇ；ＨｕａｎｇＳｈｉｓｏｎｇ；ａｎｄＺｈａｎｇＪｉｎｇ（Ｒ...

简介：AclassofnonlinearcoupledsystemforElNino-SouthernOscillation(ENSO)modelisconsidered.Usingtheasymptotictheoryandmethodofvariationaliteration,theasymptoticexpansionofthesolutionforENSOmodelsisobtained.

简介：来也匆匆，去也匆匆，获得中国首富称号后仅仅几个星期，门户网站网易公司的创始人丁磊的纸面财富就缩水了3．4亿美元，这让他的首富头衔颇受置疑。

简介：联合国近日发布的年度贸易和发展报告预测，2007年世界经济将增长3．4％，是连续第五年增长。不过该增长率还是略低于去年的4％，主要原因将是美国经济增长的下滑。报告说，2007年世界经济增长最快的地区仍将是东亚和南亚，其中中国和印度的经济增长率预计将分别为10．5％和8．5％。由于这两个国家的投资率高，他们的快速经济增长在今后若干年内可能还将持续下去。

简介：据中央电视台“新闻60分”栏目消息，在亚洲开发银行理事会第42届年会的开幕式上，亚洲开发银行行长黑田东彦说：受国际金融危机影响，“亚洲发展中经济体”今年的平均经济增长速度，预计为3．4％，低于去年的6．3％。但他相信，在各国和地区的努力之下，明年的增速有望达到6％。

简介：统计、典型年的作文方法被用来与ElNino和LaNifia事件在关系学习西北太平洋台风活动。结果显示台风趋于在ElNifio年里不活跃并且在拉·尼娜年和它里活跃也依赖于事件的发作和台风的开始的区域。与在频率和海面温度(SST)之间的ElNifio和拉·尼娜年和时间落后关联里的台风活动的频率的统计特征。有用信息被为台风出现的预言提供。另外，单个价值拆卸(SVD)方法被使用学习在重力势领域和SST地之间的关联。结果证明在ElNino年里的由空至海的联合是相反的让台风发展，它与一个更小的数字发生。相反的状况与拉·尼娜年被发现。

简介：Basedonaseriesofdataanalyses,theintimaterelationsbetweenanomalouswintermonsooninEastAsiaandElNinoarcstudiedinthispaper.AnomalisticcirculationintheNorthernHemispherecausedbyElNinoeventcanleadtoenhancingtheFerre!cellandthewesterliesinthemid-latitudesastheHadleycellandresultinthelocationofthefrontzoneinEastAsiatothenorth.TheseareunfavourableforthecoldwavebreakingoutsouthwardinEastAsia.Therefore,thereatewarmerweatherandweakerwintermonsooninEastAsiainElNinowinter.TherearestrongerandfrequentcoldwavesinEastAsiaduringthewintertimepriortotheoccurrenceofElNinoevent.TheywillinducestrongerwintermonsooninEastAsia.Thus,theweakenedtradewindandenhancedcumulusconvectionintheequatorialmiddle-westernPacificareacausedbythestrongerwintermonsoonwillplayanimportantroleintheoccurrenceofElNinoevent.Therefore,theanomalouslystrongwintermonsooninEastAsiaduringwinter