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   1459篇
  免费   304篇
  2021年   16篇
  2020年   13篇
  2019年   102篇
  2018年   74篇
  2017年   72篇
  2016年   128篇
  2015年   90篇
  2014年   88篇
  2013年   313篇
  2012年   89篇
  2011年   99篇
  2010年   74篇
  2009年   51篇
  2008年   69篇
  2007年   68篇
  2006年   48篇
  2005年   26篇
  2004年   40篇
  2003年   32篇
  2002年   24篇
  2001年   25篇
  2000年   33篇
  1999年   9篇
  1998年   15篇
  1997年   22篇
  1996年   13篇
  1995年   16篇
  1994年   14篇
  1993年   6篇
  1992年   7篇
  1991年   3篇
  1990年   3篇
  1988年   2篇
  1987年   9篇
  1986年   3篇
  1985年   4篇
  1984年   5篇
  1982年   5篇
  1981年   3篇
  1980年   8篇
  1979年   5篇
  1978年   6篇
  1977年   6篇
  1976年   5篇
  1975年   2篇
  1974年   6篇
  1973年   2篇
  1971年   2篇
  1968年   1篇
  1951年   1篇
排序方式: 共有1763条查询结果,搜索用时 15 毫秒
41.
Rabindranath Tagore, whose oeuvre provincialized Europe, thought about the Nation-State’s wars and crimes in ways congruent with that of another man from Calcutta: Radhabinod Pal, the Indian judge at the Tokyo War Crimes Trial. Several themes intersect here. Tagore was prescient about the aeroplane as the colonial vehicle of atrocity in modern war, anticipating the atomic bombs. He began with high hopes for Japan and an Asia that was one, but his story is a transition from innocence to experience of Japan’s militarism. In the face Japanese scorn at his criticisms Tagore expressed a profound moral teaching about defeat, so called, and the extent to which even victorious civilizations might dishonor themselves. Justice Pal, naively thought by the great powers to be an ally in their legal endeavors to ratify a ‘victor’s justice’, arrived in Tokyo in 1946 with a secret weapon strapped to his heart: his faith in ancient Hindu law, which covertly informs the post-colonial tenor of his ‘dissentient’ judgment, first fully published in Calcutta in 1953. The argument here rests, if that’s possible, where Ashis Nandy ends his illuminating essay on Pal: culpability in matters of war is not easily divisible.  相似文献   
42.
43.
44.
45.
46.
47.
This article introduces latent trajectory models (LTMs), an approach often employed in social sciences to handle longitudinal data, to the arena of GIScience, particularly space‐time analysis. Using the space‐time data collected at county level for the whole United States through webpage search on the keyword “climate change,” we show that LTMs, when combined with eigenvector filtering of spatial dependence in data, are very useful in unveiling temporal trends hidden in such data: the webpage‐data derived popularity measure for climate change has been increasing from December 2011 to March 2013, but the increase rate has been slowing down. In addition, LTMs help reveal potential mechanisms behind observed space‐time trajectories through linking the webpage‐data derived popularity measure about climate change to a set of socio‐demographic covariates. Our analysis shows that controlling for population density, greater drought exposure, higher percent of people who are 16 years old or above, and higher household income are positively predictive of the trajectory slopes. Higher percentages of Republicans and number of hot days in summer are negatively related to the trajectory slopes. Implications of these results are examined, concluding with consideration of the potential utility of LTMs in space‐time analysis and more generally in GIScience.  相似文献   
48.
Metallurgical analyses and chemical characterizations were carried out on historical cannonballs from the Fortress of San Juan de Ulúa, Veracruz, México. Cannonballs dating from the 18th and 19th centuries share metallurgical characteristics similar to those of material coming from a shipment of ammunition found in the wreck of a sunken French ship from the battle of Trafalgar. The analyses show that the base material is grey cast iron with a carbon equivalent of 4.94 and a ferritic–perlitic matrix, in which the high phosphorus content has led to the formation of iron phosphide compounds in conjunction with a homogeneous distribution of carbon graphite flakes of Type C. In addition, corrosion products from samples revealed the presence of various crystalline iron compounds (X‐ray diffraction), mostly highly chlorinated iron compounds identified as akaganeite. X‐ray fluorescence identified various characteristics of the corrosion products as a function of the sampling depth. FT–IR spectroscopy revealed that the main difference between the corrosion products (internal and external) is determined by the number of organic species. Differential scanning calorimetry corroborated that these corrosion products are thermally stable compounds at elevated temperatures.  相似文献   
49.
The Akko 1 shipwreck was an Egyptian armed vessel, built at the beginning of the 19th century. A wooden saw handle and a box containing iron nails and two split pins were discovered towards the stern. Given their function, location and context, these were part of the ship's carpenter's tools and accessories. A methodology was developed for conducting systematic metallurgical analysis in order to understand the manufacturing process of the surviving ironwork items, as well as to enlarge our knowledge regarding ironworking technologies during the early 19th century. Such methodology may assist in the future understanding of the technological evolution of similar wrought‐iron objects. The results demonstrated that the artefacts have a wrought‐iron heterogeneous microstructure and were manufactured by hot‐working prior to surface hardening by pack carburization.  相似文献   
50.
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