全文获取类型
收费全文 | 5827篇 |
免费 | 468篇 |
出版年
2021年 | 29篇 |
2020年 | 82篇 |
2019年 | 190篇 |
2018年 | 190篇 |
2017年 | 184篇 |
2016年 | 266篇 |
2015年 | 174篇 |
2014年 | 188篇 |
2013年 | 1643篇 |
2012年 | 217篇 |
2011年 | 254篇 |
2010年 | 229篇 |
2009年 | 176篇 |
2008年 | 164篇 |
2007年 | 177篇 |
2006年 | 153篇 |
2005年 | 92篇 |
2004年 | 90篇 |
2003年 | 87篇 |
2002年 | 78篇 |
2001年 | 85篇 |
2000年 | 92篇 |
1999年 | 84篇 |
1998年 | 65篇 |
1997年 | 59篇 |
1996年 | 44篇 |
1995年 | 57篇 |
1994年 | 43篇 |
1993年 | 46篇 |
1992年 | 30篇 |
1991年 | 41篇 |
1990年 | 46篇 |
1989年 | 39篇 |
1988年 | 33篇 |
1987年 | 45篇 |
1986年 | 44篇 |
1985年 | 54篇 |
1984年 | 53篇 |
1983年 | 52篇 |
1982年 | 46篇 |
1981年 | 47篇 |
1980年 | 48篇 |
1979年 | 44篇 |
1978年 | 37篇 |
1977年 | 42篇 |
1976年 | 31篇 |
1975年 | 30篇 |
1973年 | 31篇 |
1972年 | 31篇 |
1970年 | 28篇 |
排序方式: 共有6295条查询结果,搜索用时 15 毫秒
81.
By 1980, the Brasilian steel industry had grown to be the eighth largest among the market economies. It is a largely state-owned industry, much of the expansion of which has been funded by international capital. The pattern of development has not been externally imposed, however, but rather reflects the changing balance of class forces within Brasil as policies oscillate between nationalist, populist limits on foreign investment and open, pro-development strategies that rely on foreign investment. Both policies develop their own contradictions, that are reflected in frequent military interventions. 相似文献
82.
Mills ES 《Journal of regional science》1990,30(3):415-419
This note analyzes whether central cities and suburbs of a metropolitan area relate to each other in a meaningful way. Specifically, it analyzes whether there is a factor specific to the metropolitan area in central-city and suburban growth once national and regional factors have been taken into account. Data are analyzed for growth of metropolitan areas from 1960 to 1980. 相似文献
83.
84.
85.
86.
87.
88.
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
89.
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
90.
In order to carry out strontium (Sr) isotope analysis, glass artefacts from South Asia were sampled with portable laser ablation (pLA), a relatively novel sampling technique that leaves damage invisible to the naked eye. Subsequently, thermal ionization mass spectrometry (TIMS) was used to obtain Sr isotope ratios after sample dissolution and separation. In this study, the goal was twofold: to determine whether the measurements of Sr isotope ratios were impacted by using a portable laser as a sample tool; and to assess the pertinence of using Sr isotope ratios to provenance Indian glass. Despite a deterioration in the precision of the measurement of the Sr isotope ratios for artefacts sampled with pLA compared with the traditional sampling method, the Sr isotope ratios of certain Indian glass are so different that this does not affect their separation but a comparison of data sets obtained using standard methods and pLA might be challenging. 相似文献