全文获取类型
收费全文 | 1953篇 |
免费 | 329篇 |
出版年
2021年 | 16篇 |
2020年 | 15篇 |
2019年 | 120篇 |
2018年 | 84篇 |
2017年 | 91篇 |
2016年 | 145篇 |
2015年 | 95篇 |
2014年 | 99篇 |
2013年 | 491篇 |
2012年 | 101篇 |
2011年 | 110篇 |
2010年 | 85篇 |
2009年 | 61篇 |
2008年 | 83篇 |
2007年 | 74篇 |
2006年 | 57篇 |
2005年 | 27篇 |
2004年 | 48篇 |
2003年 | 44篇 |
2002年 | 28篇 |
2001年 | 37篇 |
2000年 | 40篇 |
1999年 | 12篇 |
1998年 | 18篇 |
1997年 | 24篇 |
1996年 | 16篇 |
1995年 | 20篇 |
1994年 | 20篇 |
1993年 | 14篇 |
1992年 | 9篇 |
1991年 | 9篇 |
1990年 | 7篇 |
1989年 | 7篇 |
1988年 | 5篇 |
1987年 | 9篇 |
1986年 | 13篇 |
1985年 | 10篇 |
1984年 | 10篇 |
1983年 | 10篇 |
1982年 | 15篇 |
1981年 | 10篇 |
1980年 | 10篇 |
1979年 | 6篇 |
1978年 | 10篇 |
1977年 | 13篇 |
1976年 | 14篇 |
1975年 | 6篇 |
1974年 | 7篇 |
1972年 | 5篇 |
1969年 | 5篇 |
排序方式: 共有2282条查询结果,搜索用时 15 毫秒
21.
Roger M. A. Allen 《Muslim world (Hartford, Conn.)》1972,62(2):115-125
22.
23.
24.
25.
26.
In this paper, we first develop a measure of total factor productivity (TFP) growth and summarize a source-of-growth analysis for the manufacturing sector of 48 states. As have others, we find little association between TFP growth differentials and output growth differentials for census regions. At the staterather than the regional level, however, we find a positive association between TFP growth and output growth. We use cross-sectional data to estimate the determinants of the variation in TFP growth. Two results emerge that are important for regional policy and for understanding national productivity trends. First, state investments in education and in transportation infrastructure may affect TFP growth. Second, energy price increases in the early 1970s had no differential effects on productivity growth across states. We also explore the determinants of manufacturing output growth and find that TFP growth, demand growth, wage growth, wage levels, and state corporate income tax rates are significant. 相似文献
27.
28.
29.
Terri‐Leigh Aldred Charis Alderfer‐Mumma Sarah de Leeuw May Farrales Margo Greenwood Dawn Hoogeveen Ryan OToole Margot W. Parkes Vanessa Sloan Morgan 《The Canadian geographer》2021,65(1):82-96
Rural, remote, northern, and Indigenous communities on Turtle Island are routinely—as Cree Elder Willie Ermine says—pathologized. Social science and health scholarship, including scholarship by geographers, often constructs Indigenous human and physical geographies as unhealthy, diseased, vulnerable, and undergoing extraction. These constructions are not inaccurate: peoples and places beyond urban metropoles on Turtle Island live with higher burdens of poor health; Indigenous peoples face systemic violence and racism in colonial landscapes; rural, remote, northern, and Indigenous geographies are sites of industrial incursions; and many rural and remote geographies remain challenging for diverse Indigenous peoples. What, however, are the consequences of imagining and constructing people and places as “sick”? Constructions of “sick” geographies fulfill and extend settler (often European white) colonial narratives about othered geographies. Rural, remote, northern, and Indigenous geographies are discursively “mined” for narratives of sickness. This mining upholds a sense of health and wellness in southern, urban, Euro‐white‐settler imaginations. Drawing from multi‐year, relationship‐based, cross‐disciplinary qualitative community‐informed experiences, and anchored in feminist, anti‐colonial, and anti‐racist methodologies that guided creative and humanities‐informed stories, this paper concludes with different stories. It unsettles settler‐colonial powers reliant on constructing narratives about sickness in others and consequently reframes conversations about Indigenous well‐being and the environment. 相似文献
30.
Archaeometric analysis of ceramic production in Tiwanaku state (c.500–1000 ce): An exploratory study
J. P. Ogalde A. Korpisaari C. Riera‐Soto B. Arriaza C. Paipa P. Leyton M. Campos‐Vallette N. Lara J. Chacama 《Archaeometry》2021,63(1):53-67
The chemical and mineralogical characterization of seven ceramic fragments produced within Tiwanaku state (c.500–1000 ce ) is reported. The instrumental techniques used included X‐ray elemental and mineralogical chemical analysis, Raman spectroscopy, and scanning and light microscopy. The results indicate there are several clay types, although they show similarities, such as the use of a plant‐based temper. The red colour of the decoration is hematite, and manganese oxides such as jacobsite are present in the black. The white colour is a mixture of gypsum and clay, and the orange is a mixture of hematite and clay. The use of colours, the quality of the clays and the temperatures reached during pottery firing point to expertise in ceramic production and to complex decision‐making processes. The multi‐elemental archaeometric approach documented here could become an important tool to shed a light on ancient ceramic technology and the internal variance of Tiwanaku pottery. 相似文献