共查询到20条相似文献，搜索用时 737 毫秒
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A. D. Kalikhman T. P. Kalikhman B. D. Sharastepanov 《Geography and Natural Resources》2011,32(2):172-178
Presented are the results from expedition-based investigations made by the Institute of Geography SB RAS, and an analysis
is made of the economic indices of development of the Okinsky district (Republic of Buryatia), which made it possible to draw
a preliminary conclusion about the formation of the ecological tourism structure on the territory of Gornaya Oka and provide
a rationale for the establishment of the “Gornaya Oka” natural park as a necessary and legislatively supported territory designed
for rational and controlled utilization of tourist and recreational resources. 相似文献
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对东南极普里兹湾海区ＮＰ９３－２柱样的古地磁研究，结果指示出两个地磁场反极性漂移，其中之一位于６０－６７．５ｃｍ，而６７．５－７２．５ｃｍ处经１４Ｃ测年为１０３１５±８００ａＢ．Ｐ．，推算该反极性漂移的年龄为９９８０－８８８０ａＢ．Ｐ．，可能是哥德堡反极性漂移（Ｇｏｔｈｅｎｂｕｒｇ，１２０００ａＢ．Ｐ．前后）在该沉积物中的记录；另一反极性漂移位于２７．５－３２．５ｃｍ处，经１４Ｃ测年为５３９０±６００ａＢ．Ｐ．。国际上所见报导的资料中尚无相应年龄的反极性事件可以与之对比。只有国内一些地区发现的反向极性漂移记录与之接近，但这些反极性漂移是否为同一事件的反映，或该反极性漂移本身是否真实存在，目前还难于论定，有待今后进一步工作加以证实 相似文献
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介绍了一种利用面向对象方法设计和实现的基于图形数据的面向对象数据管理（ＯＯＤＢＭＳ）。讨论了ＯＯＤＢＭＳ的结构和功能,定义了基于图形的数据模型和数据模式以及对象管理技术。 相似文献
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从中国盐湖钾盐 5 0年回顾 ,充分阐述了中国盐湖资源多、大、富、全等特点 ,及科学家们取得的科技成果。针对中国盐湖钾盐综合利用和高值化开发 ,提出了几点建议。 相似文献
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地貌旅游资源特征值评价模型研究 总被引：1，自引：0，他引：1
科学认定和评价旅游资源是开发利用旅游资源的前提。该文以地貌旅游资源为例 ,研究旅游资源特征值评价模型的构建及旅游资源特征值评价决策支持系统的实现 ,并将此模型应用于舒城县地貌旅游资源评价 ,与国家旅游局“旅游区 (点 )质量等级申请评定报告”中的旅游资源评价赋分标准进行对比研究 ,证实了特征值评价模型的合理性和决策支持系统的有效性。 相似文献
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本文对南极菲尔德斯半岛黑背海鸥在某些生态行为下发出的鸣声波形结构和参数进行了分析。得出 :幼黑背海鸥发出“吱”声 ,频带在 1 6 1 0至 483 1 Hz,谱峰在 1 .7、2 .5和 2 .9k Hz;黑背海鸥发出“哦”声 ,频带在 1 1 71至 43 4 3 Hz,谱峰约在 1 .5 k Hz;黑背海鸥发出“哦啊”声 ,频带在1 0 72至 3 93 2 Hz,谱峰在 1 .2、1 .7和 3 k Hz,“咯”声 ,频带在 1 3 6 0至 41 5 3 Hz,谱峰在 1 .3、2和 2 .9k Hz 相似文献
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At the 1992 Rio 'Earth Summit', Australia joined other nations in committing to processes leading to the formulation of 'Local Agenda 21s' (LA21s) by 1996. Subsequently, in the latter year, Whittaker carried out a national survey of local government authorities to evaluate what progress had been made. Whittaker's conclusion was that progress in Australia had been slow, but ten 'leading-edge' Victorian councils were identified through a self-reporting process. In this paper we discuss the concept of LA21, analyse in closer detail the 'progress' that has been made in the ten Victorian councils, and discuss some of the broader forces that, we argue, have made LA21 formulation increasingly difficult, particularly in the state of Victoria in the recent past. 相似文献
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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
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Vegetation changes in the Jornada Basin from 1858 to 1998 总被引：1，自引：1，他引：1
R.P. Gibbens R.P. McNeely K.M. Havstad R.F. Beck B. Nolen 《Journal of Arid Environments》2005,61(4):651-668
Notes made by land surveyors in 1858 were utilized to estimate cover of grasses and shrubs on the Jornada Experimental Range (JER) and the Chihuahuan Desert Range Research Center (CDRRC) in the northern Chihuahuan Desert in southern New Mexico, USA. Portions of these areas have been previously assessed for historical vegetation dynamics but the entire 84,271 ha assessed in the 19th century has not been examined in total. In 1858, fair to very good grass cover occurred on 98% and 67% of the JER and CDRRC, respectively. Shrubs were present throughout both properties but 45% of the JER and 18% of the CDRRC were shrub free. Reconnaissance surveys, made to determine carrying capacity for livestock were made in 1915–1916 and 1928–1929 on the JER and in 1938 on the CDRRC, show that shrubs had made large increases in area occupied at the time of the surveys. Vegetation type maps were made of both properties in 1998. Mesquite (Prosopis glandulosa) was the primary dominant on 59% of the JER in 1998 and creosotebush (Larrea tridentata) was the primary dominant on 27% of the area. On the CDRRC mesquite and creosotebush were primary dominants on 37% and 46% of the area, respectively. Grass cover has decreased greatly with the increase in shrubs and only shrub control efforts have maintained the once abundant black grama (Bouteloua eriopoda) as a primary dominant on 1% or less of the area on both properties. 相似文献
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(Re)theorising population geography 总被引：1，自引：0，他引：1
"Population geography has become separated from other branches of human geography by not engaging strongly with recent debates in social theory. The reasons for this partly lie in the wealth of data that population geographers have available to them concerning their major interest--demographic events....A case is made here for population geographers to consider in particular three areas of social theoretic debate--social construction theories, realist ideas on extensive and intensive research, and the politics of position. Suggestions are made as to what a (re)theorised population geography might look like." 相似文献
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Munther J. Haddadin 《The Geographical journal》2002,168(4):324-340
Water resources occupy an important role in the bilateral negotiations of the Middle East peace process. This paper mentions the conflicting water plans for the utilization of the Jordan basin by Arabs and Israelis, and describes the issues that are to be handled in the process of peacemaking. It defines the water issues between Israel and each of its neighbouring entities: Jordan, the Palestinians, Syria and Lebanon, and reviews what has been addressed in the peace negotiations thus far. A more detailed review is made of the negotiation tracks where progress was made, and a less detailed review is made of the negotiations that settled the water dispute between Jordan and Israel. The paper alludes to the claims of water wars in the region and provides evidence that water has not been a catalyst for war in the Middle East. It also proposes some topics for research that can be of interest to alleviate water shortage. 相似文献
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Michael Watts 《Singapore journal of tropical geography》1994,14(2):173-190
This overview of human geographic studies of sub Saharan Africa begins with the contributions made by West European geographers to the colonial service, and the growing interest in post-war ‘development’ and to the anti-imperial movements in the late colonial period (1945–60). The paper provides an intellectual map of the contributions by European and African geographers to the broad array of development problems which emerged after 1960. North American geographers made significant contributions to the debate somewhat later, particularly in association with the growing involvement of U.S. development agencies in the 1970s. Particular emphasis is given to geographic studies in fields such as agrarian change, ecological degradation, industrialization, human mobility and patterns of urbanization and settlement. 相似文献
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The digital mapping of satellite images under no ground control and the distribution of landform, blue ice and meteorites in the Grove Mountains, Antarctica 
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下载免费PDF全文 The colorful satellite image maps with the scale of 1∶100000 were made by processing the parameters-on-satellite under the condition of no data of field surveying. The purpose is to ensure the smooth performance of the choice of expedition route, navigation and research task before the Chinese National Antarctic Research Expedition (CHINARE) first made researches on the Grove Mountains. Moreover, on the basis of the visual interpretation of the satellite image, we preliminarily analyze and discuss the relief and landform, blue ice and meteorite distribution characteristics in the Grove Mountains. 相似文献
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GRAEME HUGO 《New Zealand geographer》1999,55(2):25-35
New Zealand origin academics have played a key role in the academic study of Australia's population in the post-war period. The paper argues that New Zealanders have contributed not only to the furthering of knowledge of the processes of change in the Australian population but have been important in the teaching of population geography in Australian universities, made inputs into policy relating to population and been influential in the development of the Australian Population Association. Major contributions have been made by New Zealanders not only in the traditionally strong areas of population geography such as internal and international migration but also in the areas of fertility, mortality and ageing. 相似文献
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广州飞龙世界游乐城关闭的原因与启示 总被引：2，自引：1，他引：2
广州番禺“飞龙世界游乐城”是广州市首座主题公园，在1995年元月开业前后，各种新闻媒体普作过大量宣传，实际景点建设、经营运作声势浩大，一度名扬粤港澳，但在营业4年后，却被广州番禺法院封闭停业了。文中从旅游科学和旅游业实践的角度，通过实地调查研究，认为其失败的主要原因是：（1）景点建设背离主题，贪大求全；（2）市场定位盲目乐观，大量设施空置；（3）经营管理上未能扬长避短，蛇系列产品未能适销对路进入园国际市场；（4）投资机制上靠贷款建设，经营严重亏损，并从中得到几点启迪，供今后创办主题公园借鉴。 相似文献