全文获取类型
收费全文 | 2256篇 |
免费 | 98篇 |
出版年
2023年 | 13篇 |
2020年 | 27篇 |
2019年 | 61篇 |
2018年 | 70篇 |
2017年 | 104篇 |
2016年 | 90篇 |
2015年 | 64篇 |
2014年 | 56篇 |
2013年 | 756篇 |
2012年 | 54篇 |
2011年 | 65篇 |
2010年 | 55篇 |
2009年 | 58篇 |
2008年 | 47篇 |
2007年 | 36篇 |
2006年 | 29篇 |
2005年 | 22篇 |
2004年 | 39篇 |
2003年 | 33篇 |
2002年 | 33篇 |
2001年 | 26篇 |
2000年 | 25篇 |
1999年 | 26篇 |
1998年 | 17篇 |
1997年 | 17篇 |
1996年 | 15篇 |
1995年 | 17篇 |
1993年 | 30篇 |
1992年 | 14篇 |
1991年 | 20篇 |
1990年 | 17篇 |
1989年 | 15篇 |
1988年 | 15篇 |
1987年 | 15篇 |
1986年 | 17篇 |
1985年 | 16篇 |
1984年 | 19篇 |
1983年 | 12篇 |
1982年 | 13篇 |
1981年 | 17篇 |
1980年 | 25篇 |
1979年 | 14篇 |
1978年 | 17篇 |
1977年 | 31篇 |
1976年 | 33篇 |
1975年 | 16篇 |
1973年 | 13篇 |
1972年 | 13篇 |
1971年 | 13篇 |
1969年 | 10篇 |
排序方式: 共有2354条查询结果,搜索用时 15 毫秒
131.
132.
133.
Eric Plutzer Michael B. Berkman James Honaker Christopher Ojeda Anne Whitesell 《政策研究杂志》2019,47(3):712-734
Welfare policy is multidimensional because of the political compromises, competing goals, and federalist structure underpinning it. This complexity has hindered measurement and, therefore, the comparability of research on race and welfare policy. This paper describes a measurement strategy that is transparent, replicable, and attuned to matching the assumptions of statistical models to the policy process. We demonstrate that this strategy leads to more nuanced conclusions regarding the relationship between minority caseloads and the flexibility of state welfare policies. The strategy and recommendations are adaptable to research agendas that scholars bring to the comparative study of welfare in the U.S. states, countries, or other units—and to other complex policies enacted in federal systems. 相似文献
134.
135.
136.
137.
Because of the highly politicized nature of the French judicialsystem in the nineteenth century, laws governing the selectionof jurors were often the subject of strong political debate.There were repeated controversies over which citizens shouldbe jurors and which authorities should draw up the annual jurylists from which the trial panels were drawn. Perhaps no eventbetter reflected the nature of the controversy than the debatewhich occurred in the National Assembly in 1872, when the conservativegovernment proposed an act which gave the judiciary power torevise the annual jury lists drawn up by elected officials.However, liberal deputies opposed the act because they maintainedit gave too much power to a conservative judiciary in determiningwhich citizens should be jurors. The debate in fact went tothe heart of the nineteenth-century struggle between the Rightand Left. 相似文献
138.
Armelle Charrié-Duhaut Jacques Connan Nicolas Rouquette Pierre Adam Christophe Barbotin Marie-Françoise de Rozières Alain Tchapla Pierre Albrecht 《Journal of archaeological science》2007
Four blue-glazed faience jars, on exhibition in the Louvre Museum, are referred to as the canopic jars of Rameses II. Their recent typological re-examination rendered this original assignment questionable. In order to clearly determine their use, a study of two successive organic residues from the canopic jars, using molecular biomarkers analysed by GC-MS and LC-MS and absolute dating by 14C, was initiated. The results revealed that these two materials were not contemporary to the reign of Rameses II. The first one, scraped from the interior face of one jar, was identified as an unguent made of coniferous oil and animal fat and dated from the Third Intermediate Period. The second one, originally stored with glued linen inside one jar, is likely an embalming substance, made of pure vegetable resin (Pistacia) and dated from the Ptolemaic Period. These results clarify a controversy which has been lasting over a century. The famous blue-glazed faience jars are not the canopic jars of Rameses II but are confirmed as situlae which were reused at least two times: first to store unguents during the Intermediate Period and later to store embalming packages of an unknown person during the Ptolemaic period. 相似文献
139.
James A. Harrell 《Arabian Archaeology and Epigraphy》2007,18(2):182-192
One of the most famous monuments of the ancient Kingdom of Saba is the first-millennium BC Awam Temple in Marib, Yemen. Despite its fame, almost nothing has been published about the building and ornamental stones used in its construction, or the quarries that supplied these stones. This paper presents the results of the first geological study of the Awam Temple and its stone quarries. 相似文献
140.
L. Martin‐Francs M. Martinon‐Torres A. Gracia‐Tllez J. M. Bermúdez de Castro 《International Journal of Osteoarchaeology》2015,25(4):564-573
We present the palaeopathological analysis of a right fourth metatarsal (ATD6‐124) recovered from the Atapuerca–Gran Dolina site (Spain). This fossil, ca. 1 Ma, belongs to Homo antecessor, the earliest known European hominin species. The metatarsal exhibits a proliferative lesion on its medial periosteal surface. Periosteal reaction can be the bone response to a wide number of injurious processes. We describe a lesion on the basis of macroscopic and microscopic analyses, including microtomography and scanning electron microscopy. Externally, the osteoblastic lesion presents a highly porotic and disorganised morphology. Internally, we observe a series of micro‐fractures on the compact bone that do not affect the medullary canal. We provide a differential diagnosis and suggest that the ATD6‐124 lesion could correspond to a pedal stress fracture, also known as fatigue or march fracture. Stress fractures have been related to a load increase and muscular fatigue. This type of fracture has been widely reported in the foot of soldiers and athletes, which are usually engaged in strenuous, excessive or prolonged locomotive activities. Despite its high frequency in these groups, stress fractures have not been reported as such in fossil collections, with the exception of a metatarsal belonging to the Sima de los Huesos site (Atapuerca). Copyright © 2013 John Wiley & Sons, Ltd. 相似文献