首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   150篇
  免费   2篇
  2024年   1篇
  2022年   1篇
  2021年   2篇
  2020年   3篇
  2019年   3篇
  2018年   3篇
  2017年   2篇
  2016年   3篇
  2015年   6篇
  2014年   2篇
  2013年   8篇
  2012年   8篇
  2011年   12篇
  2010年   11篇
  2009年   20篇
  2008年   13篇
  2007年   11篇
  2006年   11篇
  2005年   8篇
  2004年   1篇
  2003年   5篇
  2002年   6篇
  2001年   4篇
  2000年   1篇
  1999年   1篇
  1998年   2篇
  1997年   2篇
  1996年   1篇
  1994年   1篇
排序方式: 共有152条查询结果,搜索用时 31 毫秒
101.
In 2011, Myanmar started its political transition after decades of military rule. In Kachin State this coincided with the breaking of a 17‐year ceasefire between the Kachin Independence Organization/Army (KIO/A) and the state army, the Tatmadaw. For youth living in Kachin State, this meant that opportunities for civic and political participation opened up while at the same time their context remained volatile and uncertain. Using citizenship theory and the concept of the ‘everyday’, this article analyses how youth in Kachin State connect the challenges they experience to their sense of citizenship, and how this informs everyday forms of youth action as well as youth participation in policy processes. The article argues that young people act out of moral and political reasons to ‘build Kachin’, in response to deeply historically rooted experiences of discrimination and state repression. While the agency of young people living in conflict settings is often believed to be limited to tactical agency for individual and immediate survival, an analysis of youth's experiences of citizenship shows that they also act strategically to advance the interests of their society.  相似文献   
102.
By extracting information from various original materials and using geography departments, curricula, and faculty as indicators, this paper contributes to the discussion of the development of geography in higher education in China from 1904 to 1949. Four mutual connections are outlined. First, the development of geography in higher education is inextricably linked to social and political changes. Second, geography in higher education during the period concerned progressed in fits and starts, which affected its distribution. Third, geography departments were split into two categories according to the type of higher educational institution, which created differences in the tasks, curricula, and faculty of these departments. Fourth, faculty were trained in both domestic and foreign universities, and Western universities made an obvious contribution to the growth of qualified academic faculty. Simultaneously, universities where qualified academic faculty were trained were centralized both in domestic and foreign aspects. The special role of geographers returning from overseas study, the particularity of geography in higher education in China, and the connection between Chinese and foreign geography are also discussed in terms of geography departments, curricula, and faculty.  相似文献   
103.
<正>Lhakhang Township of Lhozhag County,Lhoka Prefecture,is located deep in the Himalayas.Affected by the warm moist flow from the Bay of Bengal,it has a mild and humid climate with an excellent ecological environment.Lhakhang has long been famous for its timber production.Every year,tens of thousands of planks are shipped from here to the hinterland.Today  相似文献   
104.
GIS进入历史地理学研究10年回顾   总被引:3,自引:0,他引:3  
地理信息系统进入中国历史地理学研究已经有10年历史,本文回顾了这10年间以CHGIS为主要代表的历史地理信息化建设的主要成果,显示出这一手段已经成为历史地理某些方向的常规方法,特别在历史河流地貌研究中发挥了很大作用,使历史时期河流的相对精细形态得以呈现。以黄河"京东故道"重建为代表的空间矢量数据获得方法为学界相关研究树立了典范,在矢量数据重建的基础上,"度-簇"结构和"分形"在分析所获得的历史空间矢量数据方面具有很大前景。  相似文献   
105.
Pan, B., Skovsted, C.B., Sun, H.J. & Li, G.X., 18 June 2019. Biostratigraphical and palaeogeographical implications of Early Cambrian hyoliths from the North China Platform. Alcheringa 43, 351–380. ISSN 0311-5518.

A succession of diverse hyolith assemblages comprising 10 genera and 14 species are reported from the lower Cambrian Shangwan and Sanjianfang sections of the Xinji Formation, and Xiaomeiyao section of the Houjiashan Formation, which crop out along the southern margin of the North China Platform. Most of the specimens are represented by both conchs and opercula. The identified orthothecids include Conotheca australiensis, Cupitheca holocyclata, C. costellata, Neogloborilus applanatus, N. spinatus, Tegminites hymenodes, Triplicatella disdoma, T. xinjia sp. nov. and Paratriplicatella shangwanensis gen. et sp. nov. The hyolithids comprise Protomicrocornus triplicensis gen. et sp. nov., Microcornus eximius, M. petilus, Parkula bounites and Parakorilithes mammillatus. Some anomalous taxa possess characteristics of both Hyolithida and Orthothecida, such as C. australiensis, Neogloborilus and P. triplicensis. Protomicrocornus may constitute a sister group of other hyolithids. The teeth of Parkula bounites and clavicles of Parakorilithes mammillatus are documented for the first time. The hyolith assemblages from North China are probably coeval, and can be correlated with the Cambrian upper Stage 3–lower Stage 4. Many taxa are also globally distributed and have significant potential for biostratigraphical correlations. In accordance, the hyoliths from North China reveal closest compositional similarities to faunas from eastern Gondwana, and especially South Australia. However, some taxa are shared with Laurentian assemblages suggesting cosmopolitanism, and possibly planktonic larval dispersal.

Bing Pan* [], State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, Nanjing 210008, PR China; Christian B. Skovsted [], Department of Palaeobiology, Swedish Museum of Natural History, Box 50007, SE-104 05 Stockholm, Sweden; Haijing Sun [], State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, Nanjing 210008, PR China; Guoxiang Li [], State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, Nanjing 210008, PR China. *Also affiliated with: University of Science and Technology of China, Hefei 230026, PR China and Department of Palaeobiology, Swedish Museum of Natural History, Box 50007, SE-104 05 Stockholm, Sweden.  相似文献   
106.
以清代永定河芦沟桥志桩尺寸记录为骨干资料,结合近现代器测水文资料,使用分段建模的方法恢复了1766-2004年永定河芦沟桥断面的汛期径流量序列,序列表明永定河径流量在逐年尺度上具有极大的不稳定性,但其洪峰规模自19世纪以来不断减小,19世纪中期与20世纪初期是最为明显的丰水时段,而1920年代后径流量便明显萎缩,枯水期一直延续至现代。进入1920年代后,流量变化在18世纪后期至19世纪存在的30年准周期消失,水量变化呈现无周期特征。与太平洋年代际振荡指标PDO的比对发现,两者在30-40年尺度上具有明显的反相关关系,天然状态下,太平洋温度升高对应于永定河流域较为干旱的时段。海温异常造成的季风强度变化会导致华北地区降雨格局出现变化,进而影响到永定河芦沟桥以上河段的汛期水量,表明处于季风区北部边缘的永定河水系对于太平洋海温变动具有更大的敏感性。  相似文献   
107.
1920年7月,广州护法国会迁往昆明,谋求组织新的中华民国军政府,再举“护法”大旗.这是护法运动时期滇桂矛盾激化、护法军政府内部分裂的表现与发展,也是民国宪政发展史的组成部分,反映了云南在民初政治斗争中的地位和影响.非常国会在云南的活动,名不符实,受到多方面的批评与责难.  相似文献   
108.
魏晋南北朝社会长期分裂对峙,但北方农业仍在向前发展:一、耕作工具和耕作技术有了大的进步,牛耕得到广泛普及,畜力耙及牵引软套都被发明出来,传统的耕一耙一耱北方旱田耕作体系形成。二、继承汉代精耕细作的传统,强调“宁可少好,不可多恶”,发展区种法,重视提高单位面积效益。三、农业中畜牧成分增加,是北方农业适应外部变化的一次重大产业结构调整,有利于农业增收和土地利用率的提高。总体看来,是进大于退。  相似文献   
109.
民国时期苏北水灾灾况简述   总被引:2,自引:0,他引:2  
潘涛 《民国档案》1998,(4):108-110
历史上苏北人民长期不能摆脱天灾和人祸这两种灾难带来的苦厄命运,有兵燹之灾以及一系列的自然灾害,诸如水灾、旱灾、蝗灾等等。其中又尤以洪魔肆虐为甚,或为黄河泛滥夺淮入海、或为暴雨引起山洪暴发、或为飓风海啸致灾,不一而足。民国时期,苏北地区水灾的发生更为频繁,给苏北人民带来的损失与苦难更为深重,每次大水过后,哀鸿遍野,死亡枕藉,其状惨不忍睹。  相似文献   
110.
ABSTRACT

Growing in number in the last two decades, rural migrant workers in China have completed intergenerational replacement, and young migrants have become a principal part of the migrant population. However, the process of such intergenerational reproduction has not been thoroughly examined. Based on field studies in the Chinese countryside, this paper analyzes the mechanisms of intergenerational reproduction of rural migrants from the perspective of rural communities, families, and school education. “Left-behind” rural communities, their migration-oriented social culture, and the cognition of rural–urban differences as constructed through migrant parents facilitated a subjective willingness for migration among left-behind children. Exclusion from urban-biased rural education is often the final external thrust for their migration. Having finished the transition, the households of a new young generation of rural migrants are experiencing a different crisis of reproduction. This paper argues that there is a systematic rupture between labor, households, and rural society and that this presents a critical development trap for China.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号