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   323篇
  免费   5篇
  2024年   1篇
  2022年   3篇
  2021年   5篇
  2020年   11篇
  2019年   5篇
  2018年   8篇
  2017年   3篇
  2016年   10篇
  2015年   9篇
  2014年   6篇
  2013年   16篇
  2012年   15篇
  2011年   28篇
  2010年   37篇
  2009年   39篇
  2008年   24篇
  2007年   27篇
  2006年   21篇
  2005年   22篇
  2004年   5篇
  2003年   8篇
  2002年   6篇
  2001年   2篇
  2000年   6篇
  1999年   1篇
  1998年   2篇
  1997年   2篇
  1996年   2篇
  1994年   1篇
  1993年   2篇
  1991年   1篇
排序方式: 共有328条查询结果,搜索用时 781 毫秒
71.
邓洪波  陆林  虞虎 《人文地理》2018,33(4):130-136
空铁型综合交通枢纽是将航空枢纽和高铁枢纽有机整合而形成的航空高铁一体化综合交通枢纽,具有较强的经济社会带动作用,对区域空间演化产生重要影响。根据复杂适应系统理论,选取上海虹桥综合交通枢纽地区为案例地,分析了空铁型综合交通枢纽地区地域空间演化阶段性特征。结果表明:交通枢纽地区地域系统通过多个适应性主体之间非线性相互作用形成复杂适应系统,该地域系统演化过程可划分为枢纽地区空间形成阶段、枢纽地区空间生长阶段和枢纽地区空间涌现阶段。上海虹桥综合交通枢纽地区在三个阶段特征不同,配套设施建设、要素集聚与流动、城市功能形成与发展、区域品牌形成等方面不断深化。研究有助于认知综合交通枢纽地域系统空间演化规律,为深化研究和实践发展提供科学借鉴。  相似文献   
72.
战后天津暨华北地区日俘日侨遣返研究   总被引:1,自引:1,他引:0  
本文依据大量的档案资料,全面考察了抗战胜利后华北各地约34万日俘日侨经天津遣返的基本情况.笔者以为,中国政府在这次遣返过程中的举措总体而言是值得肯定的,它对华北战后的社会安定和民众情绪的抚慰产生了十分积极的影响,体现出中华民族与人为善、宽宏大量的民族性格.  相似文献   
73.
胡芳 《攀登》2010,29(6):125-127
媒介形式和媒介内容的日趋多样化,使作为重要知识储备群体的大学生面临着空前复杂的媒介环境。在这一形势下,依托高校图书馆服务功能的拓展,开展大学生媒介素养教育具有重要的现实意义。  相似文献   
74.
J. Cao  W. Hu  X. Wang  D. Zhu  Y. Tang  B. Xiang  M. Wu 《Geofluids》2015,15(3):410-420
In this paper, we attempt to differentiate hydrocarbon‐bearing reservoir horizons of the Junggar Basin of NW China based on the characteristics of diagenesis and associated elemental geochemistry. Reservoirs at this site have varying levels of oil saturation that correlate with the degree of dissolution in minerals (e.g., calcite and feldspar). Four different horizons with varying diagenetic mineral assemblages were observed, including (i) kaolinite‐rich, oil‐dominated horizons, (ii) kaolinite–pyrite–hematite‐rich, oil–water‐dominated horizons, (iii) siderite–chlorite‐rich, water‐dominated horizons, and (iv) chlorite‐rich horizons with negligible hydrocarbon production. The mean MnO content of the representative diagenetic mineral (e.g., calcite) in each of the above horizons is >2.5, 2.0–2.5, 1.5–2.0, and <1.0 wt%, respectively. We propose that the above methodology can be used for the identification of reservoir hydrocarbon‐bearing horizons. We argue that the indicators presented here can be applied in oil exploration across the Junggar Basin.  相似文献   
75.
朱浒 《清史研究》2015,(2):83-96
"义赈"一词最晚在16世纪已经产生。在其后数百年中,该词的流布情况,以及与之相关联的实践内容,都出现了重大变化。起初,该词主要被作为捐赈活动的一个褒称,使用频率十分有限。到19世纪前半期,该词开始被用来指称一种特定的地方性赈灾活动,其名声得到较为广泛的传播。从19世纪70年代起,该词又成为新兴民间赈灾活动的专名,并风行于海内外。这种名称不变而实践内容发生剧烈转换的状况,体现的正是一种既传承又超越的新陈代谢进程。而结合社会史和文化史来充分理解这一进程,也可以为考察中国民间赈灾事业的演变提供一条有益的线索。  相似文献   
76.
During the late Longshan period (ca. 4200–3900 BP) settlements on the Central Plains of China underwent a diversification in food production technologies, which set the stage for rapid economic and social development. The introduction of novel domesticates such as rice, wheat, cattle, and sheep not only provided more food choices, but also changed ideas concerning land use, farming techniques, and the use and mobilization of large scale labor forces. To better understand the contribution that these new dietary items and practices made to shaping the late Longshan period societies, a stable isotope ratio study of humans (n = 12) and animals (n = 42) was conducted at the late Longshan period site of Wadian. The human δ13C and δ15N values are clustered into two distinct groups. One group of nine individuals (δ13C = −9.9 ± 0.7‰; δ15N = 7.5 ± 0.5‰) had a predominately C4 diet based on millet grains with little protein input from the domestic animals. The other group of three individuals (δ13C = −14.3 ± 0.8‰; δ15N = 10.2 ± 0.3‰) had a mixed C3/C4 diet of millets and rice and were consuming sheep and cattle. The animals also displayed dietary diversity with the pigs (δ13C = −11.3 ± 2.5‰; δ15N = 6.9 ± 1.0‰, n = 10) and dogs (δ13C = −10.1 ± 1.0‰; δ15N = 7.2 ± 1.1‰, n = 7) having mostly a C4 plant based diet (millets). In contrast, the cattle (δ13C = −12.8 ± 2.1‰; δ15N = 7.6 ± 0.7‰, n = 9), sheep (δ13C = −16.7 ± 0.9‰; δ15N = 7.6 ± 0.1‰, n = 2), and cervids (δ13C = −20.8 ± 0.9‰; δ15N = 5.0 ± 1.2‰, n = 10) had diets with a greater contribution from C3 sources such as rice and wild plants. The discovery that humans and animals had different subsistence patterns indicates dietary complexity at Wadian and that rice agriculture, and cattle and sheep husbandry practices were already an important part of the local economy by the late Longshan period in the southern region of the Central Plains of China. Copyright © 2015 John Wiley & Sons, Ltd.  相似文献   
77.
Located in the Central Plains of China, the early Xia Dynasty site of Xinzhai (2050 BC–1750 BC) with large archaeological features and exquisite artifacts of jade and copper is pivotal for probing the origin and formation of Chinese civilisation. Here, stable isotope ratios analysis, supplemented by zooarchaeological results, was used to investigate the exploitation and management of animals utilised by humans. It was demonstrated that a diverse pattern of animal raising and exploitation was present at the Xinzhai site. The domestic pigs were fed with substantial amounts of millets or their byproducts to guarantee a food source for the dietary demands of the humans. Dogs were also found to have consumed large amounts of C4 protein sources, likely in the form of human food scraps or leftovers. The domestic herbivores, sheep and cattle, showed different dietary characteristics in that the former mainly grazed in the natural environment, while the latter species were fed with large amounts of C4 products. This intra‐species variation was somewhat related to their physiological characteristics but seems to have been more determined by their different status in social and ritual activities. Thus, this research at Xinzhai provides a glimpse of the organisation of animal resources during the initial formation of Chinese civilisation. Copyright © 2015 John Wiley & Sons, Ltd.  相似文献   
78.
Although a patchwork of projects shows a process of agriculture intensification in North China during the Neolithic, the impact of cereal farming on animal husbandry and their mutual interaction remain cloudy. This study reports bone collagen δ13C and δ15N of humans and animals from Wayaogou (ca 6.5–6.0 kyrs bp ) and Dongying (ca 5.9–5.6 kyrs bp , 4.6–4.0 kyrs bp ) to explore temporal trend of livestock raising and particularly the importance of millet fodder to stock raising practices in the Wei River valley, North China. The isotopic evidence overall shows that millet products increased in human and domestic animal diets during the mentioned chronological span. δ13C values of pigs and dogs at Dongying are higher than those at Wayaogou, implying that the importance of millet nutrients increased to animal husbandry diachronically. Interestingly, δ13C results of domestic cattle of Dongying late phase (−14.1 ± 1.1‰, N = 5) are more enriched than Wayaogou wild Bos (−17.8 ± 0.3‰, N = 3), indicating that millet fodder had taken a significant place in early cattle husbandry. Besides, differences between Bos species of the two periods also imply that δ13C values of bone collagen constitute a potential indicator for tracing the origin of cattle husbandry in North China. In addition, domestic sheep at Dongying produced similar isotope data to wild ovicaprid at Wayaogou, suggesting that they possibly had grazed for the most in grassland and therefore experienced a different lifestyle from cattle. Copyright © 2014 John Wiley & Sons, Ltd.  相似文献   
79.
胡燕 《丝绸之路》2010,(8):71-72
艺术符号并不表现概念,也不代表这个概念所指向的任何具体事物。具体到艺术品中,我们从中体会到的是浸透着情感的表现,而不是一种情感标示的记号,因此把艺术品称之为"有意味的形式"。一件艺术品浸透着情感、心境或是供它表现的其他具有生命力的经验,这也就是称其为"表现性形式"的原因,对于其所表现的东西,我们并不称之为"意义",而是称之为"意味"。  相似文献   
80.
胡戟 《丝绸之路》2010,(24):27-31
唐太宗曾言:"以史为鉴,可以知兴替。"如果能将历代人对当时国家社会治理的满意度与现在作比较,就可以知道现在哪些地方做得好、哪些地方需要改进。本文以唐人诚信故事为例,论述了大唐精神中最有价值的自爱、自信、自尊和让天下人折服的诚信。  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