全文获取类型
收费全文 | 5469篇 |
免费 | 151篇 |
出版年
2020年 | 58篇 |
2019年 | 94篇 |
2018年 | 82篇 |
2017年 | 121篇 |
2016年 | 123篇 |
2015年 | 100篇 |
2014年 | 102篇 |
2013年 | 1905篇 |
2012年 | 89篇 |
2011年 | 106篇 |
2010年 | 111篇 |
2009年 | 106篇 |
2008年 | 103篇 |
2007年 | 93篇 |
2006年 | 70篇 |
2005年 | 59篇 |
2004年 | 69篇 |
2003年 | 68篇 |
2002年 | 51篇 |
2001年 | 67篇 |
2000年 | 74篇 |
1999年 | 105篇 |
1998年 | 75篇 |
1997年 | 60篇 |
1996年 | 54篇 |
1995年 | 46篇 |
1994年 | 50篇 |
1993年 | 51篇 |
1992年 | 44篇 |
1990年 | 51篇 |
1989年 | 53篇 |
1988年 | 48篇 |
1987年 | 64篇 |
1986年 | 58篇 |
1985年 | 68篇 |
1984年 | 64篇 |
1983年 | 87篇 |
1982年 | 67篇 |
1981年 | 47篇 |
1980年 | 73篇 |
1979年 | 66篇 |
1978年 | 59篇 |
1977年 | 63篇 |
1976年 | 54篇 |
1975年 | 61篇 |
1974年 | 51篇 |
1973年 | 35篇 |
1972年 | 37篇 |
1970年 | 41篇 |
1969年 | 36篇 |
排序方式: 共有5620条查询结果,搜索用时 15 毫秒
991.
992.
Paul W. Schroeder 《国际历史评论》2013,35(2):358-370
HENRY KISSINGER. Diplomacy. New York: Simon & Schuster, 1994. Pp. 912. $45.00 (US) M. S. ANDERSON. The Rise of Modern Diplomacy, 1450–1919. London and New York: Longman, 1994. Pp. x, 320. $80.95 (CDN) KEITH HAMILTON and RICHARD LANGHORNE. The Practice of Diplomacy: Its Evolution, Theory, and Administration. London and New York: Routledge, 1995. Pp. vii, 879. £12.99, paper JAMES L. RICHARDSON. Crisis Diplomacy: The Great Powers since the Mid-Nineteenth Century. New York: Cambridge University Press, 1994. Pp. xi, 436. $59.95 (US), cloth; $19.95 (US), paper. 相似文献
993.
M. García-Diez D.L. Hoffmann J. Zilhão C. de las Heras J.A. Lasheras R. Montes A.W.G. Pike 《Journal of archaeological science》2013
The rock art in Altamira Cave was the first ensemble of Palaeolithic parietal art to be identified scientifically (Sautuola, 1880). Due to the great thematic, technical and stylistic variety of the art in the cave, which constitutes one of the most complete Palaeolithic art ensembles, Altamira was listed as World Heritage by UNESCO in 1985. Uranium-series dating has recently been applied to figures on the decorated ceiling in the cave. Several motifs are partly covered by thin layers of calcite precipitates, whose formation process is datable by this method. The results provide the date when the calcite formed, which gives a minimum age for the underlying depictions. These results confirm that the parietal art at Altamira was produced during a prolonged period of time, at least 20,000 years (between 35,000 and 15,200 years ago), and that part of the ensemble corresponds to the Aurignacian period. 相似文献
994.
The emergence of stone-tipped projectile weaponry was an important event in hominin evolution. A common archaeological approach to identifying projectile weapons is to extrapolate from optimal values of ballistically-relevant attributes as determined from ethnographic North American weapons and modern experiments. Among the most significant of these attributes is “tip cross-sectional area” (TCSA) because it determines a point's efficiency in penetrating an animal. The warranting argument for projecting these data onto prehistoric artefacts is that past “research and development” necessarily led to stone projectiles with optimal TCSA values for a given delivery system. However, our test of this warranting argument, involving analysis of 132 hafted ethnographic Australian stone projectile points and 102 hafted knives, demonstrates that Aborigines did not optimize TCSA values, thus offering a challenge to TCSA-based narratives about the first appearance of projectile weaponry. This illustrates the difficulty of inferring ancient stoneworkers' design intentions from narrowly-defined optimal values. Instead, tool designs should be considered in the context of the reduction sequences that produced them and the dynamics of transmission of those reduction sequences across generations. 相似文献
995.
In this paper, we present a model of prehistoric southwestern Colorado maize productivity. The model is based on a tree-ring reconstruction of water-year precipitation for Mesa Verde for the period A.D. 480 to 2011. Correlation of historic Mesa Verde precipitation with historic precipitation at 11 other weather stations enabled the construction of an elevation-dependent precipitation function. Prehistoric water-year precipitation values for Mesa Verde together with the elevation-dependent precipitation function allowed construction of the elevation of southwest Colorado precipitation contours for each year since A.D. 480, including the 30-cm contour, which represents the minimum amount of precipitation necessary for the production of maize and the 50-cm contour, which represents the optimum amount of precipitation necessary for the production of maize. In this paper, calculations of prehistoric maize productivity and field life for any specific elevation are also demonstrated. These calculations were performed using organic nitrogen measurements made on seven southwestern Colorado soil groups together with values of reconstructed water-year precipitation and estimations of the organic nitrogen mineralization rate. 相似文献
996.
Robert M. Rosenswig Ricardo López-Torrijos Caroline E. Antonelli Rebecca R. Mendelsohn 《Journal of archaeological science》2013
Recent lidar and pedestrian surface surveys have remapped the well-known Mesoamerican site of Izapa and the surrounding Soconusco piedmont. These data document: 1) occupation from the surrounding piedmont environment, 2) significantly larger estimates of the site's size during both the Formative and Classic periods as well as 3) new architectural features from the monumental site core. Methodological issues are outlined for combining high precision lidar mapping with ground truthing and pedestrian survey that focuses on surface collection of temporally diagnostic artifacts. Results are presented for 670 mounds documented in an area of 43.1 sq km in and around the ancient capital of Izapa. 相似文献
997.
R.W. Kostal 《The Journal of imperial and commonwealth history》2013,41(1):1-34
The English East India Company has long been regarded as a ‘mere merchant’ that turned into a sovereign only with its eighteenth-century territorial acquisitions in India. Focusing on the first decades of Company rule at St Helena, this article argues instead that the late seventeenth-century Company aspired to become a polity in itself: a self-sustaining global system built upon sound civic institutions and informed by a coherent if composite political ideology. In the end, the Company's early history at St Helena demands a flexible understanding both of the boundaries of the British ‘Atlantic world’ and of the various kinds of political communities beyond the national state instrumental in fashioning early modern empires. Moreover, such a political and intellectual approach to the early Company confounds the trade-to-empire narrative that has long defined its history, insisting on deeper and more complex roots for the ‘Company-State’ and thus for British Empire in India. 相似文献
998.
Karen J. Taylor Aaron P. Potito David W. Beilman Beatrice Ghilardi Michael O'Connell 《Journal of archaeological science》2013
This study provides a unique method of inquiry for archaeological investigation with an aim to assess the intensity and effects of Neolithic and Bronze Age farming practices at Lough Dargan, northwest Ireland, through a multi-proxy analysis of a lake sediment core. Chironomid (non-biting midge fly) subfossils and lake sediment geochemistry (δ13C, δ15N and C:N ratios) were used to assess changes in limnological conditions through time. The limnological data were compared with macroscopic charcoal concentration and pollen data to examine the potential influence that early farmers had on a freshwater lake system within a prehistorically active catchment. Results from the chironomid analysis show that the first substantial period of agricultural activity in the early Neolithic (c. 3730–3190 BC) resulted in a temporary shift to more eutrophic lake conditions. There is evidence of animal husbandry with substantial levels of animal waste reaching the lake, leaving an imprint in the geochemical record of increased δ15N values and decreased δ13C values and C:N ratios during this time. The chironomid community reverted back to its pre-impacted state c. 3190 BC in response to a period of reduced farming (c. 3390–3000 BC) which eventually led to a distinct lull in activity, with possible cessation of farming from 3000 to 2700 BC. A return to eutrophic conditions coincided with the gradual return of agriculture, with more permanently altered lake conditions dominating from 2400 BC, even during a 250-year period of reduced human activity commencing at c. 1440 BC. Increased sedimentation rate, along with increases in δ13C, δ15N and C:N, the presence of chironomid taxa indicative of erosion, more eutrophic lake conditions and high concentrations of macroscopic charcoal all point to more intensive land use practices during the Bronze Age. Palaeolimnological data exhibited an immediate response to intensified farming during this time, and were especially responsive to pastoral farming due either to scale of activity or proximity to the lakeside. The success of this study demonstrates the effectiveness of palaeolimnological analysis in the investigation of prehistoric farming. This approach will help inform Neolithic and Bronze Age land-use practice and human–environment relations in the region, and highlights the potential for chironomid-based archaeological research. 相似文献
999.
Alastair W. Pearson 《Imago Mundi: The International Journal for the History of Cartography》2013,65(2):215-243
ABSTRACT The 1:1 million Map of Hispanic America, compiled at the American Geographical Society's New York headquarters between the First and Second World Wars, has been seen as a landmark in twentieth-century cartography. In this essay we re-evaluate the Hispanic Map as a technical and scholarly project and re-assess its wider significance for the history of twentieth-century topographic mapping in the light of the cultural and political factors that shaped its development. When finally completed in 1945, the Hispanic Map was rightly judged an unsurpassed scientific achievement and a major work of art. But it was already out of date, superseded by newer cartographic technologies, particularly aerial survey and reconnaissance, that had removed the need for the kind of meticulous and painstaking compilation that the Hispanic Map exemplified. 相似文献
1000.