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   256篇
  免费   9篇
  2023年   3篇
  2021年   2篇
  2020年   3篇
  2019年   2篇
  2018年   7篇
  2017年   11篇
  2016年   7篇
  2015年   4篇
  2014年   4篇
  2013年   94篇
  2012年   4篇
  2011年   4篇
  2010年   4篇
  2009年   4篇
  2008年   4篇
  2007年   5篇
  2006年   2篇
  2003年   3篇
  2002年   5篇
  2001年   5篇
  2000年   6篇
  1999年   5篇
  1998年   2篇
  1997年   4篇
  1996年   2篇
  1995年   4篇
  1994年   2篇
  1993年   4篇
  1992年   3篇
  1989年   2篇
  1986年   3篇
  1985年   2篇
  1984年   3篇
  1983年   6篇
  1982年   2篇
  1981年   5篇
  1980年   2篇
  1979年   1篇
  1977年   4篇
  1976年   1篇
  1975年   2篇
  1974年   4篇
  1973年   1篇
  1972年   3篇
  1971年   3篇
  1970年   1篇
  1969年   2篇
  1967年   1篇
  1958年   2篇
  1956年   1篇
排序方式: 共有265条查询结果,搜索用时 15 毫秒
11.
The reasons why the Western Mediterranean, especially Carthage and Rome, resisted monetization relative to the Eastern Mediterranean are still unclear. We address this question by combining lead (Pb) and silver (Ag) isotope abundances in silver coinage from the Aegean, Magna Graecia, Carthage and Roman Republic. The clear relationships observed between 109Ag/107Ag and 208Pb/206Pb reflect the mixing of silver ores or silver objects with Pb metal used for cupellation. The combined analysis of Ag and Pb isotopes reveals important information about the technology of smelting. The Greek world extracted Ag and Pb from associated ores, whereas, on the Iberian Peninsula, Carthaginians and Republican‐era Romans applied Phoenician cupellation techniques and added exotic Pb to Pb‐poor Ag ores. Massive Ag recupellation is observed in Rome during the Second Punic War. After defeating the Carthaginians and the Macedonians in the late second century bce , the Romans brought together the efficient, millennium‐old techniques of silver extraction of the Phoenicians, who considered this metal a simple commodity, with the monetization of the economy introduced by the Greeks.  相似文献   
12.
The imperative to coordinate is strong, but the means remain contentious. One approach is to amalgamate agencies into a few large organizations, the other to encourage a diversity of policy options. Drawing on the federal amalgamations of departments in Australia since 1987, this paper reports that senior bureaucrats find more policy coordination benefits than costs from working in larger structures, while ministers report a loss of options and a risk of information overload.  相似文献   
13.
This essay synthesizes the history of the birth control movement in the US and describes changes in sexual behavior, social values, and public policy in order to provide a context for the changes in human reproductive public policy. After an introduction, the essay outlines the history of contraception from the early nineteenth to the early twentieth centuries. Part 3 covers the period of World War I to the Depression when civil libertarians and eugenicists began to question the suppression of contraception and Margaret Sanger organized her clinics. The fourth part of the essay carries the history forward to the end of World War II, a period in which Dr. Clarence J. Gamble began to expose the marketing of defective contraceptive methods and to illustrate the willingness of poor women to accept contraceptives. The social changes which began in the 1950s are the subject of the fifth section of the essay. During this period, Roman Catholic opposition to contraception lessened, and social scientists began to focus world attention on overpopulation. Frank Notestein was appointed the first head of the Office of Population Research at Princeton, and John D. Rockefeller III founded the Population Council which conducted research into the IUD and began to attempt to influence population growth in nonindustrialized countries. This period also saw the development of the oral contraceptive. The changes of this era were institutionalized in 1967 when the federal government took a positive stance towards family planning in its Social Security Amendments. The decade of the 1970s is the subject of the last part of this essay. This period saw the Supreme Court assign a constitutionally protected right to abortion and Congress pass the Helms Amendment which denied the use of foreign aid funds for abortions. Challenges to the right to individual birth control practice continued during this period, and debate centered around the specter of overpopulation, the threat of adolescent pregnancy, and perceptions of "family values."  相似文献   
14.
15.
Recent Paleolithic work along the middle Enisei River of central Siberia has revealed a long history of occupation that almost certainly begins in the Middle Pleistocene. Although the evidence for the Lower Paleolithic is somewhat tentative, there is good reason to believe that hunter-gatherers had periodically occupied the middle Enisei before the last interglacial. The steppe environment of the region during the Upper Pleistocene was relatively bountiful; more than 200 Upper Paleolithic sites, both before and after the Last Glacial Maximum, have been located. The region appears to have been abandoned during the Last Glacial Maximum. Most of Soviet and Russian archaeological work has been guided by a cultural–historical orientation, but recently there has been increased interest in developing adaptationist and ecological research strategies. The middle Enisei and the wider central Siberian region are key to understanding early adaptations to the north and the dimensions of Paleolithic population movements.  相似文献   
16.
The Revolution of 1959 brought forth changes in the mission, theoretical orientation, and organization of archaeology in Cuba and created a role for, and constraints on, the profession that are unique in the Western Hemisphere. This paper draws upon examples from substantive field and laboratory research to examine the methods and theoretical perspectives of Cuban archaeology since the Revolution, focusing on the period from 1962 until the collapse of the Soviet Union. Archaeological practice during the Revolutionary period in Cuba has reflected the aims of the Revolutionary government, the influence of Soviet archaeology, the legacy of pre-Revolutionary approaches in North American archaeology, and the Cuban sense ofpatria.  相似文献   
17.
18.
19.
Reviews     
Tanebar-Evav: Une société de maisons tourné vers le large. By Cécile Barraud. Cambridge and Paris, Cambridge University Press and Editions de la Maison des Sciences de l'Homme. 1979. Pp. xii + 283.  相似文献   
20.
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