全文获取类型
收费全文 | 5234篇 |
免费 | 252篇 |
出版年
2023年 | 39篇 |
2020年 | 109篇 |
2019年 | 111篇 |
2018年 | 188篇 |
2017年 | 193篇 |
2016年 | 217篇 |
2015年 | 138篇 |
2014年 | 138篇 |
2013年 | 1523篇 |
2012年 | 167篇 |
2011年 | 196篇 |
2010年 | 178篇 |
2009年 | 147篇 |
2008年 | 119篇 |
2007年 | 113篇 |
2006年 | 123篇 |
2005年 | 81篇 |
2004年 | 59篇 |
2003年 | 65篇 |
2002年 | 71篇 |
2001年 | 76篇 |
2000年 | 67篇 |
1999年 | 81篇 |
1998年 | 62篇 |
1997年 | 44篇 |
1996年 | 36篇 |
1995年 | 49篇 |
1994年 | 35篇 |
1993年 | 50篇 |
1992年 | 33篇 |
1991年 | 43篇 |
1990年 | 47篇 |
1989年 | 42篇 |
1988年 | 33篇 |
1987年 | 44篇 |
1986年 | 47篇 |
1985年 | 47篇 |
1984年 | 52篇 |
1983年 | 47篇 |
1982年 | 41篇 |
1981年 | 47篇 |
1980年 | 42篇 |
1979年 | 39篇 |
1978年 | 36篇 |
1977年 | 36篇 |
1975年 | 27篇 |
1974年 | 27篇 |
1973年 | 29篇 |
1972年 | 29篇 |
1970年 | 27篇 |
排序方式: 共有5486条查询结果,搜索用时 15 毫秒
941.
942.
A. Perea P.C. Gutiérrez-Neira A. Climent-Font P. Fernández-Esquivel S. Rovira-Llorens J.L. Ruvalcaba-Sil A. Verde A. Zucchiatti 《Journal of archaeological science》2013
One of the most important pre-Columbian gold assemblages made up of more than one hundred objects from two tombs in the Cauca river valley, Colombia, was studied to obtain archaeometric information. Although several attempts have been made to arrange gold production in time and space from the stylistic point of view, no firm conclusions were possible due to the lack of archaeological contexts. This paper presents first results of a new, fully instrumental approach, in which different analytical techniques, including OM, SEM-EDS, XRF, PIXE, RBS, AMS and X-ray imaging, were applied in order to determine a technological, metallurgical and chronological frame of the so-called Quimbaya Treasure. 相似文献
943.
E. Fernández S. Thaw T.A. Brown E. Arroyo-Pardo R. Buxó M.D. Serret J.L. Araus 《Journal of archaeological science》2013
In the present work we attempt to recover endogenous ancient DNA from cereal grains preserved under different conditions: charred, partially charred and waterlogged. A total of 126 grains from naked wheat and 18 from barley from different sites on the Eastern Iberian Peninsula ranging from the beginning of agriculture in the region to the turn of the Common Era, were studied. Two different extraction protocols were used, a standard phenol–chloroform method and a silica-based DNA extraction procedure implemented for artificially charred seeds. Amplifications were directed to three markers: the large subunit of ribulose 1,5 biphosphate carboxylase (rbcL) and the microsatellite WCT12 in the chloroplast genome and the x and y subunits of the high molecular weight glutenin gene (Glu-1) in the nucleus. The first two were used to assess the preservation status of the samples, while with the third we tried to identify the wheat grains at species level. It was possible to obtain eleven positive amplifications in 8 partially charred seeds but only two amplifications of the Glu-1 gene from a single sample of the Early Bronze age were genome-specific. Different contamination sources were identified and reported. Cloning and alignment of sequenced clones showed a correspondence of the amplified fragment to modern wheat D genome haplotypes. This result suggests that the sample corresponds to hexaploid wheat (Triticum aestivum L.), thus being the first ancient DNA evidence to date for the cultivation of hexaploid wheat in the prehistoric agriculture of the Iberian Peninsula. Moreover, obtained results highlight contamination problems associated to the study of ancient archaeobotanical charred seeds suggest that the combination of a silica-based extraction method together with the amplification of specific targets is a good strategy for recovering endogenous ancient DNA from this kind of material. 相似文献
944.
R. Alan Covey Brian S. BauerVéronique Bélisle Lia Tsesmeli 《Journal of Anthropological Archaeology》2013
The archaeological reconstruction of ancient states requires consistent regional measures of state-directed power and influence. This paper presents data from a series of systematic archaeological surveys in the Cusco region of highland Peru to evaluate patterns of influence by the Wari state during a period of colonization from ca. AD 600–1000. We discuss interpretive debates over the nature and intensity of Wari social power, suggesting that site-based studies can be contextualized meaningfully using our large-scale dataset, which offers settlement patterns at varying distances (0–70 km) from Pikillacta, a Wari administrative center. We discuss local settlement patterns before and during Wari colonization, as well as the distribution of Wari pottery and local Wari-influenced wares. We then use a geographic information systems analysis of travel time from key sites to evaluate the broad regional distribution patterns of local and Wari ceramic styles. Although the regional survey data do not inform us reliably about all kinds of social power, we conclude that the Wari cultural, economic, and political influence over the Cusco region was limited and discontinuous—an example of colonization that resembles the practices of other early states. 相似文献
945.
Living and dying as subjects of the Inca Empire: Adult diet and health at Puruchuco-Huaquerones,Peru
Imperial strategies varied as the Inca expanded their empire from the capital in Cusco. Some communities were conquered violently while others were ruled indirectly with little evidence of Inca presence. According to ethnohistorical evidence, the central coast was peacefully annexed by the Incas ca. A.D. 1470, but little is known about how Inca imperialism may have affected the quality of life of subjects of the Inca Empire. We integrate multiple lines of evidence to assess diet, health and disease for a sample of human remains from the Late Horizon cemetery of Puruchuco-Huaquerones, Peru. Specifically, we examine and analyze osteological, dental and stable isotope data (n = 162, 90 and 46 respectively) in order to investigate whether the Inca period population at Puruchuco-Huaquerones experienced nutritionally insufficient diets and poor health under imperial policies. Diet at Puruchuco-Huaquerones incorporated a variety of foods, both plant and animal. Osteological lesions and stature indicate periods of stress, with males experiencing more illness relative to females. Stature sexual dimorphism, the presence of healed lesions and isotope data indicate a sufficiently nutritious diet and support the conclusion that, although disease was present, individuals were healthy enough to survive and recover. Geographical and temporal comparisons suggest that health changed little with the Inca annexation of this region, but future work is needed. 相似文献
946.
A.S. Kanya-Forstner Ulrich Trumpener Peter C. Kent Teddy J. Uldricks J. Shrecker John E. Kendle 《国际历史评论》2013,35(2):291-314
ROBERT J. YOUNG. French Foreign Policy, Nineteen Eighteen to Nineteen Forty-Five: A Guide to Research and Research Materials, ed. Christoph M. Kimmich. Wilmington, Delaware: Scholarly Resources Inc., 1981. Pp. xv, 242. $17.50 (US). Reviewed by A.S. Kanya-Forstner CHRISTOPH M. KIMMICH. German Foreign Policy, Nineteen Eighteen to Nineteen Forty Five: A Guide to Research and Research Materials. Wilmington, Delaware: Scholarly Resources Inc., 1981. Pp. ix, 293. $17.50 (US). Reviewed by Ulrich Trumpener ALAN CASSELS. Italian Foreign Policy, Nineteen Eighteen to Nineteen Forty- Five: A Guide to Research and Research Materials, ed. Christoph M. Kimmich. Wilmington, Delaware: Scholarly Resources Inc. 1981. Pp. xi, 271. $17.50 (US). Reviewed by Peter C. Kent VOJTECH MASTNY. Russia's Road to the Cold War: Diplomacy, Warfare, and the Politics of Communism, 1041–1945. New York: Columbia University Press, 1979. Pp. xix, 409. $16.95 (US). Reviewed by Teddy J. Uldricks R. KEITH SCHOPPA. Chinese Elites and Political Change: Zhejiang Province in the Early Twentieth Century. Cambridge, Mass.: Harvard University Press, 1982. Pp. 280. $30.00 (US). Reviewed by J. Shrecker EDWARD M. SPIERS. Haldane: An Army Reformer. Edinburgh: Edinburgh University Press, 1980. Pp. vi, 240. £10.00. Reviewed by John E. Kendle IAN NISH, ed. Anglo-Japanese Alienation, 1919–1952: Papers of the Anglo-Japanese Conference on the History of the Second World War. New York: Cambridge University Press, 1982. Pp. 320. $37.50. Reviewed by Ray Jones JOHN C. G. RÖHL and NICOIAS SOMBART, eds. Kaiser Wilhelm II: New Interpretations. Cambridge: Cambridge University Press, 1982. Pp. 319. $39.50 (US). Reviewed by Konrad H. Jarausch ROBIN FISHER and J.M. BUMSTED, eds. An Account of a Voyage to the Northwest Coast of America in 1785 and 1786 by Alexander Walker. Vancouver: Douglas & McIntyre; Seattle: University of Washington Press, 1982. Pp. 319. $24.95. Reviewed by Christon I. Archer ERIK P. HOFFMANN and ROBBIN F. LAIRD. The Politics of Economic Modernization in the Soviet Union. Ithaca, NY: Cornell University Press, 1982. Pp. 215. $19.50 (US). Reviewed by Cyril E. Black WERNER G. HAHN. Postwar Soviet Politics. The Fall of Zhdanov and the Defeat of Moderation, 1946–53. Ithaca and London: Cornell University Press, 1982. Pp. 243. $19.50 (US). Reviewed by Richard K. Debo VICTOR ROTHWELL. Britain and the Cold War, 1941–1947. London: Jonathan Cape, 1982. Pp. 551. £16. Reviewed by Gerald Jordan DAN P. SILVERMAN. Reconstructing Europe after the Great War. Cambridge, MA: Harvard University Press, 1982. Pp. vii, 347. $25.00 (US). Reviewed by Keith L. Nelson 相似文献
947.
948.
949.
950.
Michael S. Goodman 《国际历史评论》2013,35(4):768-784
Abstract F EWER COLD WAR myths are more enduring in the United Kingdom than that of ‘Buster’ Crabb. In April 1956, Britain’s Secret Intelligence Service (SIS) coaxed Commander Lionel ‘Buster’ Crabb, a naval frogman from the Second World War, out of retirement to dive under the Soviet cruiser Ordzhonikidze, while it was docked in Portsmouth. It had brought the Soviet Premier Nikolai Bulganin and the First Secretary of the Communist Party, Nikita S. Khrushchev, to the United Kingdom on a state visit. The operation, routine by all accounts, ended in both personal and diplomatic failure. Fourteen months later, the decomposed body of a frogman washed up in Chichester harbour. Despite the British government’s hope that the discovery might be the end of the affair, it fired up the conspiracy theorists, who alleged that the body could not be Crabb’s; that, in fact, he had been kidnapped, taken to the Soviet Union, and renamed Korablev.1 The government did little to dispel such myths. A few days after Crabb’s disappearance, The Times succinctly summed up the situation: ‘official reticence about the activities which led to the death of Commander Crabb has caused much speculation.’2 Curiosity was further piqued a few days later when the prime minister, Sir Anthony Eden, stated m the house of commons on 9 May that ‘it would not be in the public interest to disclose the circumstances in which Commander Crabb is presumed to have met his death.’3 相似文献