共查询到20条相似文献，搜索用时 687 毫秒
2.
《地理学报(英文版)》1978,(1)
ABSTRACT According to repeated measurements at the fixed station, geomorphological in-vestigation, documentary records and recalls of the local residents, the Batura Glacier's terminus has undergone many changes during the- Quaternary and recent time. 相似文献
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HANNAN RASMUSSEN RHODES DONALD E.MYERS Department of Applied Mathematics University of Arizon Tucson AZ U.S.A. 《地理学报(英文版)》1991,(3)
Correspondence analysis(CA)was applied to lakewater data in order to study the effects of acidicdeposition on the geochemical composition of lakes in the Adirondacks.The lake chemistry dataanalyzed were taken from the Eastern Lake Survey-Phase I(ELS-I)conducted by the U.S.Environmental Protection Agency.CA was used to identify‘outlying’lake samples as well as‘superfluous’and‘unresolved’analytes.Correlational relationship among analytes were also examined. 相似文献
5.
TheLoessPlateauarealocatedinti1eMiddleReachesoftheYellowffiver(MRYR)isti1ecradleoftheCltinesenationandthesourceoftheancientcivilization.However,dun11galongpenodoftime,unreasonablelanduse,rapidpopulationgrowthandsenousmptiol1damagemadetheoriginalcriticaIenvirorunentevenworsened,deePlyichuencingtheeconowhcdeveloPmrmandtheimProvementoflocalpeople'slivingstandard.Thege0graplticalenvirorul1entisaco11unonandnecessaryextemalcondition.Wthsocialprogressandsciatificandtechnicaldevelopn1Cnt,theconn… 相似文献
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1.1ntroductionVolcanosofMt.Unzen-dakeinJapanandMt.PinatubointhePhilippineseruptedoneafteranotherduringthefirstandsecondtendaysOfJunel99l.ThevolcaniceruPtionindex(VEI)ofMt.Pinatub0withgrade6isthehighestoneinthesCenury[2].Inl99l,rainyseasonadvantalintheYang… 相似文献
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《The Professional geographer》2013,65(3):278-282
The effects of intra-farm distance on farm income have not been previously tested in North America. European studies are inconclusive as they use data taken from bookkeeping accounts for the farm as a whole. This paper calls for field-to-field farm analyses that combine internal movement costs with costs of production, yields, and farm-gate prices. In a study applying this method to Manitoba grain farms, it was found that adjustments in the organization and intensity of farming offset the effects of distance on net income. 相似文献
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PAUL W. BLANK 《Geographical review》1999,89(2):265-277
ABSTRACT. This article examines the parallels between the developing Pacific Basin and the historical Mediterranean Basin. Humankind's expanding reach in transportation and communication technologies now makes it possible to integrate a basin the size of the Pacific. The Mediterranean provides some insight into the processes involved. Topics include questions of hegemony, “mirror cities” that interact with each other across the basins, and the dynamic tension between cosmopolitanism and localism. 相似文献
9.
Liu Xiaojin 《地理学报(英文版)》1994,(Z1)
l.Introducti0nIntheseveraldecadestilltheendofthe1970s,therewasnoanyleastd0ubtthatChinahadbeenfollOwingabalancedregi0naldevelopmentstrategy.0bligedtotlledolnesticandinternationalsituationofthattime,capitalinvestlnentxvasn1ost1yf0rcedt0beputintotheundevel0pedarea(westeconomiczone),thisstrategyprovedtobelesseffectiveandincurredahugelossofinvestmentbenefit.Althoughthewestzoneisabundantinnatllralresources(mineral,energyresourcesetc.),thelevelofregionaldevel0pmentfromeastzonet0westzoneisgradua1lydec… 相似文献
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The Problem of studying eomPlex multicomPonent systems without seParation of theeomPonents 15 well known.Generally,the situation arises whenever interaetions betweeneomPonents are essential in determining the funetion of the system,notably in biochemiealsystems and in eatalysis.In eases sueh as these,the ultimate aim 15 to deduee the role of eaehof the eomPonents as well as the interaetions between them by 相似文献
11.
《地理学报(英文版)》1997,(1)
ＴｈｅＹａｒｌｕｎｇＺａｎｇｂｏＲｉｖｅｒＣａｎｙｏｎ,ｗｈｉｃｈｅｎｃｏｍｐａｓｓｅｓＭｏｕｎｔＮａｍｊａｇｂａｒｗａ,ｉｓｏｎｅｏｆｔｈｅｆｅｗｍｙｓｔｉｃａｌｆｏｒｂｂｉｄｅｎａｒｅａｓｒｅｍａｉｎｉｎｇｏｎｅａｒｔｈａｎｄｉｓｈｏｍｅｔｏｍａｎｙｐｒｏｆｏｕｎｄｇｅｏｌｏｇｉｃａｌａｎｄｂｉｏｌｏｇｉｃａｌｍｙｓｔｅｒｉｅｓａｗａｉｔｉｎｇｅｘｐｌｏｒａｔｉｏｎ.Ｉｎｒｅｃｅｎｔｙｅａｒｓ,ｓｃｉｅｎｔｉｓｔｓｆｒｏｍｔｈｅＩｎｓｔｉｔｕｔｅｏｆＧｅｏｇｒａｐｈｙａｎｄＩｎｓｔｉｔｕｔｅｏｆ… 相似文献
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THE TEMPORAL AND SPATIAL PATTERNS OF ENVIRONMENTAL RISK EVENTS IN THE PAST 30 YEARS IN SHENYANG CITY
1.IntroductionEnvironmentalrisk'isamajorenvirotunedlthreattothesustainabilityoftheropon.ItsanalysishasbecomeafOcusofenvironmentalstudyinthepastl0years.0win8torapideconothecdeveloPmentinChina,manykindsOfpotatialriskshavegreatlyhamPeredtheroponalsustainable… 相似文献
14.
《The Professional geographer》2013,65(2):212-217
The two following reports offer complementary perspectives on the spatial distribution of geographers in the United States. The first of these looks at the changing sources of doctoral degrees and the second addresses the question of where degree holders are currently most successful in practicing their profession. 相似文献
15.
《The Professional geographer》2013,65(3):246-252
Soil conservation programs and management of sediment pollution in streams are both concerned with land conservation and water quality, but specific management goals are usually governed by separate considerations. Geomorphic concepts, especially the fluvial sediment budget, can be used to examine the relationship between upland soil erosion and sediment pollution in waterways. An example of such an application is given for the upper Tar River basin of North Carolina, showing that achieving soil loss goals will not prevent continuing high stream sediment concentrations and water quality deterioration. The budget concept can also be used to determine whether direct control of sediment input to waterways is needed in addition to on-site erosion control. Usually such applications require assumptions of a constant qualitative character of the sediment budget. 相似文献
17.
Li Wenyan 《地理学报(英文版)》1996,(3)
I.Introductionl.BasicfcatUresofportcitiesandthcirwhuencingfactorsTl1elhstoricalexperiencesofdevelopedcowtrieshavewitnessedtheessel1tialro1eplayedbyseaportsinpromotingdevelopn1entofnationaleconomy.Manyportcities,emergodfron1marinetransportation,supportedbyseaandlandroLrtesandflourishedn1ainlythroughindustryandtrade,oftenbecomendonalornationalecononhccenters.fu11ongti1eworld's2Omeqalopolesofmorethan6ntilIionpopulation,l2areportcities.AlmosteverycoUntrywiti1coastalline,longorshort,roprdsoneors… 相似文献
18.
《Urban geography》2013,34(4):345-361
This paper examines the gender ratios of the Statistical Metropolitan Areas (SMAs) of Bangladesh for the last intercensal period (1981-1991) and discusses the factors that are associated with the changing gender ratios of the SMAs. The latest population census of Bangladesh suggests that the gender ratios of its four SMAs decl ined markedly during the last decade. This decline is explained in terms of the decentralization of government administration, initiation of rural development programs, increased opportunities for over-seas employment, and openings of employment for rural women in the garment industries of the SMAs. 相似文献
19.
THE TYPHOON DISASTERS AND RELATED EFFECTS IN CHINA 总被引：2，自引：0，他引：2
I.liltreductionNatraldisasterisoneofthemajorglobalproblemswithwhichmankindarefacingnowadays,andtrphoondisasterisespeciallyatyPeofgJobaldisasterwiththehighestoccurrencefequencyandmostseriousimpaCt(').AccordingtoStatistics[l],onearth,8otoloOtroPicalcyconesoccurredeveryyear,andcausedanaverageeconowhclossof6to7billionU.S.dolIarsandacasualtyof2O,ooopeople.ThedisaSterscausedbyafeWtaphoonsweremuchmoreaStorushing.Forexample,atropicalstormoccurredinNovemberl97oandanotherinAPrill99lhitBangladesha… 相似文献
20.
WILLIAM S.RAYENS CIDAMBI SRINIVASAN Department of Statistics University of Kentucky Lexington KY U.S.A. 《地理学报(英文版)》1991,(3)
The statistical analysis of compositional data is of fundamental importance to practitioners in generaland to chemists in particular.The existing methodology is principally due to Aitchison,who effectivelyuses two transformations,a ratio followed by the logarithmic,to create a useful,coherent theory thatin principle allows the plethora of normal-based multivariate techniques to be used on the transformeddata.This paper suggests that the well-known class of Box-Cox transformations can be employed inplace of the logarithmic to significantly improve the existing methodology.This is supported in part byshowing that one of the most basic problems that Aitchison managed to overcome,namely thespecification of an interpretable covariance structure for compositional data,can be resolved,or nearlyresolved,once the ratio transformation has been applied.Hence the resolution is not directly dependenton the logarithmic transformation.It is then verified that access to the general Box-Cox family will allowa more accurate use of the normal-based multivariate techniques,simply because better fits to normalitycan be achieved.Finally,maximum likelihood estimation and some associated asymptotics are employedto construct confidence intervals for ratios of the true,unknown compositional constituents.Heretoforethis had not been done even in the context of the logarithmic transformation.Applications to real dataare presented. 相似文献