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500 个结果
  • 简介:Climatechangehasbecomewidelyacceptedasachallengethathumanswillfaceinthenot-too-distantfuture.Mountainecosystemsandtheirinhabitantsareamongthemostvulnerabletoclimatechange.ThispaperseekstoexplainmigrationdriversinspecificmountainregionsinthecontextofclimatechangebasedonForesight’sconceptualframework.AclimatechangesensitivefieldnamedShangnanCountyinsouthernShaanxiProvinceischosenasthecasestudyareatoinvestigatelocalmigrationdrivers.Aseriesofqualitativeresearchmethodsisemployedinthecasestudyincludingparticipantobservation,semi-structuredinterviews,andfocusgroupdiscussions.Theevidenceofsurveysuggeststhatmigrationdecisionsarenotonlyshapedbymacrofactorsinaspectsofenvironmental,economics,demographic,social,politicsandpsychological,butalsoinfluencedbyplaced-relatedbarriersandfacilitatingmechanismsandpersonalcharacteristics.

  • 标签: climate change MIGRATION DRIVER MOUNTAIN region
  • 简介:Thehumificationdegreeofpeatisasignificantclimaticproxyforpaleoclimatechange.Usingthealkali-extractionmethod,atimeseriesofabsorbancevaluesoftheHanipeatland,NortheastChina,wasdetermined,whichisusedasanindicatorforthehumificationdegreeofpeat.Combinedwith14Cdatingdataofpeatcellulose,andcomparedwithδ18Oandδ13CtimeseriesofthecelluloseintheHanipeatland,theevidencefortheexistenceof14kapaleoclimatewasprovided.Higherhumificationdegreeshintawarmer-wetterclimate,andviceversa.ItalsoreconstructsthefourstagesofHoloceneclimateevolutioninthisregion:11.5–9.8calkaB.P.,warmandwetperiod;9.8–9.0calkaB.P.,coldanddryperiod;9.0–4.8calkaB.P.,warmandwetperiod;and4.8–0calkaB.P.,warm-wetanddry-coldalternationperiod.Meanwhile,itisrevealedthattheabruptclimateshiftssignalssuchasthe'8.2ka'eventandthe'4.2ka'event.ResultsshowedthattheHanipeathumificationdegreeisofsensitiveresponsetopaleoclimatechange.Therefore,itisafeasiblemethodtoanalyzetherelationshipbetweenpaleoclimatechangeandpeathumificationdegree.

  • 标签: 古气候变化 腐殖化程度 泥炭地 全新世 东北 中国
  • 简介:Withtheseriesofannualandseasonaltemperatureduring1957-2001inDongguan,Guangdong,thestatisticalcharacteristicandpowerspectrumandseculartrendandsuddenchangephenomenaarecomputedinthispaper.Fromtheresultsitisknownthat(1)thetemperatureshaveobviouscharacteristicsofmonsoonclimatebutdonothavenormaldistribution,showingbiaseddistributionofhighorlowkurtosis;(2)overtherecenthalf-century,thetemperaturestendtorise,speciallyinthelast10years,inwhichmeantemperaturehavequicklyascendedbyabout1.5°C,andexceptforthespring,thereweresuddenchangeofseasonaltemperaturerisingfromthe1980'sto1990's,whichreallyreflectedtheinfluenceofdevelopingandopeningandurbanizationonDongguantemperature;(3)exceptforthespring,thetemperatureofotherseasonsshowsomeoscillatoryperiodsinDongguanandsomeofthemalsoincludelong-termvariationtrends.

  • 标签: 东莞市 温度变化 统计分析 长期趋势 温室效应
  • 简介:Inthearticle,theauthorreportsonacasestudyofchronicpainproblemscausedbyherownfootdeformity.TheauthorbeganusingTaiji,ChenstyleChanSiGong(ReelingSilk),andZhanZhuang(standingmeditation)torelievechronicpainsince1986.AftermorethantwoyearsofQigongtraining,thestructureoftheauthor'sfootchangedfromthepreviousdeformitytonormalfootshape.Thesechangesenabledtheauthortowalknormallyandtobefreefrompersistentchronicpain.ThearticlediscussedthemethodsofusingQicurrentsandotherissuesthatneedtobepaidattentiontowhenpracticingTaichi,suchashowtoadjustone'smentalfocusandmaintainastateofrelaxationto"mindful".Taichiinvolvesanumberofinternal"micro-adjusting"abouthowthesetechniquesrelaxandstrengthenmusclestoreducechronicpain.ThereportanddiscussiononthetreatmentprincipleofQigongcanprovidenewstrategiesforthetreatmentofchronicpain.

  • 标签: QI TAIJI chronic PAIN Zhan Zhuang
  • 简介:在人口分发和密度学习变化能为地区性的开发提供重要基础并且计划。空间模式和在在中国的人口密度的变化的开车因素还不是清楚的。用在2000和2010的人口普查数据,因此,这研究第一在中国分析了人口密度的变化并且在所有2353个县把变化划分了成4种类型,由快速的增加,慢增加,慢减少和快速的减少组成。随后,基于部分最少的平方(请)回归方法,我们认出了重要因素(在11个自然、社会经济的因素之中)为有人口变化的不同类型的整个国家和县的影响人口密度变化。结果显示出那:(1)在2010,与在2000的人口密度相比,在大多数县(超过60%)的人口密度每km由21个人增加了2平均,当在另外的县的人口密度每km由13个人减少了时2。所有2353个县,当458和446个县分别地在人口密度显示出慢、快速的减少时,860和589个县分别地在人口密度显示出快速、慢的增加。(2)在11个因素之中,社会经济的因素比自然因素更显著地影响了人口密度变化。更高经济的发展水平,更好医药的条件和更强壮的通讯能力是人口增加的主要的拉因素。稠密的人口密度是人口减少的主要的推因素。这些结论在过去的10年在中国澄清了人口变化和它的影响因素的空间模式并且能为计划的未来人口提供有用参考。

  • 标签: 人口密度 中国人口 影响因素 社会经济因素 密度变化 经济发展水平
  • 简介:Inordertofindthedominantfactorofenergyefficiencychange,thispaperusesthemodifiedstructuralmodeltoanalyzeenergyefficiencychangefrom1990to2012inXinjiang.Theresultshowsthattheenergyefficiencyincreaseislargelyduetoenergytechnologicalinnovationespeciallybytheindustrialsector,andthecontributionfromstructuralshiftislimited.Therefore,weshouldvigorouslysupportenergy-savingtechnologicalprogressintheindustrialsectoranddevelopthemodernserviceindustrieswithlowerenergyconsumption,inordertorealizethegoalofimprovingenergyefficiency.

  • 标签: ENERGY efficiency factor DECOMPOSITION MODIFIED structural
  • 简介:Developmentandsustainabilityarethecoreconnotationofsustainabledevelopment.Sustainabilityofeconomicdevelopmentandtheprovisioncapabilityofresourcesandenvironmentaretwoaspectsofsustainabledevelopment.Theformeronesarethefoundationofthelatterones.Industrialstructurehasacloserelationshipwithsustainabledevelopment.Theoptimizationofindustrialstructureistheimportantbaseforthesustainabledevelopmentofmoderneconomyandalsotheimportantwaysofthesustainableutilizationofresourcesandenvironment.Theintensivegrowtheffectofindustrialstructurechangehasthemeaningofsustainabledevelopment.Thispaperreviewsandexplainsthetheoryonthecontributionofindustrialstructurechangetosustainabledevelopment,buildsthecalculationmodelthroughintroducingthecoefficientofindustrialstructurechange,makesanempiricalstudyonthecontributionofindustrialstructurechangetosustainabledevelopmentinFujian,andputsforwardwaysandpoliciesofoptimizingindustrialstructurebothamongindustriesandinsidetheindustryintheprocessofindustrialstructurechange.

  • 标签: 可持续发展 工业结构 定量分析 优化产业结构 产业结构变化 案例
  • 简介:TheruralsettlementsaccountedforagreatproportionofoverallbuildinglandinChina,butitstillexpandedinrecentyearsalongwithurbanizationandgraduallydecreasingruralpopulation.Toexplorethereasonforthisphenomenon,ananaly-sishasbeenmadebasedontheinvestigationinatraditionalagri-culturalregion.Thisstudyfoundthatsocioeconomicfactors,in-cludingthescaleoffamiliesanditsquantity,theimprovementofruralpublicinfrastructure,thechangeofpopulationandthepres-sureofarableland,haveeffectsontheexpansion.Theviewonlandtenurewhichhasshapedinfarmersmindsinthelonghaulmakesthemdisposetheirhousescautiously,andthiswasthemaincauseofthefactthatonehouseholdownmorethanoneplot.Inaddition,thelimitationsofrurallandinstitutionareunconducivetoinspiritingthetransferoffarmers'buildinglandandredevel-opmentoftheidlehousingland.

  • 标签: 农村 经济发展 经济结构 转换模式
  • 简介:Thebesttrackdataoftropicalcyclones(TCs)providedbyRegionalSpecializedMeteorologicalCenter(RSMC)TokyofortheSouthChinaSea(SCS)from1977to2007areemployedtostudythespatiotemporalvariations(foraperiodof12hours)andtherapid(slow)intensification(RI/SI)ofTCswithdifferentintensity.Themainresultsareasfollows.(1)Overthisperiod,thetropicalstorms(TSs)andseveretropicalstorms(STSs)mostlyintensifyoraresteadywhilethetyphoons(TYs)mostlyweaken.ThestrongeraTCisinitially,themoreobservationofitsintensificationandthelessitsvariabilitywillbe;themoreobservationofitsweakeningis,thelargeritsvariabilitywillbe.(2)TheTCintensifiesthefastestat0000UTCwhileweakeningthefastestat1200UTC.(3)Intheintensifyingstate,TSs,STSs,andTYsaremainlyactiveinthenortheastern,central-eastern,andcentralSCSrespectively.TheweakeningcasesmainlydistributeoverwaterseastoffHainanIslandandVietnamandwestoffthePhilippines.SomecasesofTSsandSTSsweakenoverthecentralSCS.(4)TheRIcasesformfarthersouthincontrasttotheSIcases.TheRIcasesareobservedinregionswherethereareweakerverticalshearandeasterlycomponentsat200hPa.TheRIcasesalsohavestrongermid-andlower-levelwarm-corestructureandsmallerradiiof15.4m/swinds.TheSIcaseshaveslightlyhigherSST.

  • 标签: 热带气旋 统计 紧张 华南海
  • 简介:ThecropmodelWorldFoodStudies(WOFOST)wastunedandvalidatedwithmeteorologicalaswellaswinterwheatgrowthandyielddataat24stationsin5provincesofNorthChinafrom1997to2003.Theparameterizationobtainedbythetuningwasthenusedtomodeltheimpactsofclimatechangeonwinterwheatgrowthforallstationsusinglong-termweatherdatafrom1950to2000.Twosimulationsweremade,onewithallmeteorologicaldata(rainfed)andtheotherwithoutwaterstress(potential).Theresultsindicatethatthefloweringandmaturitydatesoccurred3.3and3daysearlierinthe1990sthanthatinthe1960sduetoa0.65℃temperatureincrease.Thesimulatedrainfedyieldsshowthattheaveragedroughtinducedyields(potentialminusrainfedyields)havedecreasedby9.7%overthelast50years.Thisistobecomparedwitha0.02%decreaseinyieldiftheprecipitationlimitislifted.Althoughtheprecipitationduringthegrowingseasonhasdecreasedoverthelast50years,thedroughteffectsontherainfedyieldsremainedtobepracticallyunchangedasthespringprecipitationdidnotdecreasemarkedly.

  • 标签: CROP growth model World Food Studies
  • 简介:在那里躺在海床破坏和在碎的行动下面的毛孔水压力的分发之间的一种靠近的关系波浪。实验与泼出沙的海床学习常规碎波浪的1:30在波浪斜槽被执行导致的毛孔水压力。从常规波浪跑的大量大小被报导,包括波浪高度的时间系列,毛孔压力。录像记录被分析在打破区域的波浪测量海床形式的时间发展和沙的轨道的运动的特征。在断路器地区的毛孔水压力显示出包括波浪碎和讨厌的人繁殖取决于波浪阶段的时间变化。平均时间的毛孔水压力在海床表面附近是更高的。毛孔水压力的山峰价值在碎点显著地增加。在断路器地区的毛孔水压力差别力量的方向具有为对沉积动力学的正确描述的基本重要性。upwardsdirected压力差别可以由减少沉积的有效重量增加沙运输,从而增加床形式进化。在打破地区和一个沙酒吧的波浪极大地改变的海床配置显著地被产生。毛孔水压力的振幅随着海床表面变化了。结果是由于在泼出上打破常规波浪改进沙运输机制和海床回答的理解沙的床。

  • 标签: 孔隙水压力 配置文件 实验 波浪破碎区 沙质海床 时间序列
  • 简介:AIM:Tostudytheeffectsofglutamine(Gin)onthechangeofintestinalpermeabilityanditsrelationshiptosystemicinflammatoryresponseinearlyabdominalpostoperativepatients.METHODS:Aprospective,randomized,double-blindandcontrolledtrialwastaken.TwentypatientsundergoingabdominalsurgerywererandomizedintoGingroup(oraladministrationofglutamine,30g/d,for7d,n=10)andplacebogroup(oraladministrationofplacebo,30g/d,for7d,n=-10).Temperaturesandheartratesofallpatientsweredailyrecorded.Whitebloodcellcounts(WBC)andbiochemicalvariablesweremeasuredbeforeoperationand4and7dalterdrugadministration.Serumconcentrationsofglutamine,endotoxin,diamineoxidaseandmalondialdehydeandurinelactulose/mannito(L/M)ratioweremeasuredbeforeand7dalterdrugadministration.RESULTS:Thepatientsinthe2groupswerecomparablepriortodrugadministration.SerumGinconcentrationwassignificantlydecreasedintheplacebogroupandincreasedintheGingroup7dalterdrugadministration.UrineL/MratiowassignificantlyincreasedintheplacebogroupanddecreasedintheGingroup.Theserumconcentrationofendotoxin,diamineoxidaseandmalondialdehydewassignificantlydecreasedintheGingroupcomparedwiththoseintheplacebogroup.Temperatures,heartratesandWBCcountsweresignificantlylowerintheGingroupthanthoseintheplacebogroup.CONCLUSION:Gutisoneofthesourcesofsystemicinflammatoryresponseinabdominalpostoperativepatientsandglutaminecandecreaseintestinalpermeability,maintainintestinalbarrierandattenuatesystemicinflammatoryresponseinearlypostoperativepatients.

  • 标签: 谷氨酰胺 早期 手术治疗 肠渗透性 系统性 炎性反应
  • 简介:AZ31Mg合金的微观结构进化在变化隧道期间,尖挤出(CCAE)被调查。AZ31Mg合金的谷物在在523K使变形的CCAE以后从500m显著地被精制到15m。脱臼在挤出的起始的阶段被导致,他们自己重排在变丑期间形成脱臼边界和亚谷物边界。当通过有紧张的水平变化隧道的标本增加了时,亚边界演变到高角度谷物边界(HAGB)。谷物精炼的过程能被描述为连续动态恢复和再结晶(CDRR)。

  • 标签: AZ31镁合金 微观结构 演变 挤压 通道 转角
  • 简介:UsingthedigitaltelemetricseismicwaveformdataofChengduandKunming,thisarticlestudiesthefocalmechanismsolutionsandtheapparentstressvaluesofalargenumberofsmallearthquakes,andthenanalyzesthedynamicvariationofregionalstressfieldsandthespatio-temporaldistributionofapparentstressvalues.TheannualvariationvaluesoftheazimuthofaverageprincipalstressfieldbeforetheMay12,2008M_S8.0WenchuanearthquakeintheSichuan-Yunnanregionwere58°from2003to2004,85°from2003to2005,61°from2006to2007and90°from2006toApril2008respectively.Inrecentyears,deflectionordisturbancesoccurredintheazimuthoftheaverageprincipalstressfieldintheSichuan-Yunnanregion.AnalysisshowsthatthismayberelatedtothechangeofstressfieldstatesofcrustalblocksbeforeandaftertheDecember26,2004M_S9.0Sumatraearthquakeandthe2008M_S8.0Wenchuanearthquake.Theratioofthrust-typeearthquakesintheSichuan-Qinghaiblockwasonthehighersideintheperiodfrom2006to2007,andthesourcefaultingtypeoftheregionalmoderateandsmallearthquakeshadchangedbeforetheM_S8.0Wenchuanearthquake.ThechangeofstateofthestressfieldisconsistentwiththechangesinblockdisplacementfieldsrevealedbyGPSdataandthecrustalshorteningvelocityverticaltotheLongmenshanfaultzone.Basedontheradiationenergycalculatedfromallbandsoftheseismicwaveform,thevalueofapparentstressσ_appisobtained.Thefluctuationshapeofthefittingtrendoftheapparentstressisrelatedtotheintensityofregionalseismicity.Itrevealsthatthemicro-dynamicfluctuationprocessoftheregionalstressvalueissimilartotheazimuthtransitionoftheregionalprincipalcompressivestressfield,whichcanbeusedtoprobeforpregnantphysicalprocesses.Areaswithahighervalueofapparentstressσ_apparepossibleareasofpotentialseismicrisk.Itcanbeseenfromthespatialdistributionofthemediumandshort-termapparen

  • 标签: 地震学 理论 方法 研究
  • 简介:FromtheUSNewEnergyPlan,personnelappointment,anddiplomaticactivities,etc.,wecanseethatUSisnowonthewaytoreturningtothenegotiationtableandundertakingtheleadershipinaddressingclimatechange.WhatUShasdoneputstremendouschallengesonChina,whichemitslargeamountofgreenhousegasintotheatmosphere.However,differentfromUS,Chinaisundergoingrapiddevelopment,andhugeenergyconsumptionisunavoidable.Chinahastomakeabalancebetweendevelopingeconomyandaddressingclimatechange.ThispaperfocusesontheUSclimatechangepoliciesanditsgreenhousegasemissions,anditsinfluencesonChinaclimatechangepolicy.ChinagreenhousegasemissionsandrelativepoliciesarealsoanalyzedtoseewhatsituationChinaisin,andwhatchallengesthatChinaisfacing.Consequently,combingChina'slocalsituation,weproposeseveralsolutionsforChinatoaddressclimatechange,i.e.movingtowardsalowcarboneconomy,strugglingforemittingmore,enhancingChina-UScooperation,andimplementingdifferentclimatechangepoliciesbasedonlocalsituation.Meanwhile,theachievementsthatChinahasmadearealsointroduced.

  • 标签: 中国 气候变化 气体散发 低碳经济