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   2583篇
  免费   321篇
  2024年   3篇
  2023年   14篇
  2022年   16篇
  2021年   32篇
  2020年   63篇
  2019年   119篇
  2018年   89篇
  2017年   85篇
  2016年   137篇
  2015年   124篇
  2014年   107篇
  2013年   337篇
  2012年   163篇
  2011年   214篇
  2010年   174篇
  2009年   174篇
  2008年   175篇
  2007年   159篇
  2006年   154篇
  2005年   96篇
  2004年   52篇
  2003年   65篇
  2002年   48篇
  2001年   36篇
  2000年   52篇
  1999年   23篇
  1998年   36篇
  1997年   24篇
  1996年   26篇
  1995年   22篇
  1994年   17篇
  1993年   8篇
  1992年   6篇
  1991年   7篇
  1990年   3篇
  1989年   2篇
  1987年   3篇
  1986年   3篇
  1985年   3篇
  1984年   3篇
  1982年   6篇
  1980年   3篇
  1979年   2篇
  1977年   6篇
  1976年   2篇
  1974年   2篇
  1971年   1篇
  1969年   1篇
  1968年   1篇
  1951年   1篇
排序方式: 共有2904条查询结果,搜索用时 15 毫秒
31.
The bodies and glazes of 27 early Western Zhou proto‐porcelain samples from Yejiashan cemetery, Hubei Province, were analysed using LA‐ICP–AES, SEM, XRD, a thermal expansion instrument and other analytical methods. The results indicated that the bodies of all samples were characterized by high silicon and low aluminium, and were made with porcelain stone raw materials found in the south of China. The glazes are typical of high‐temperature calcium glazes of the CaO (MgO) – K2O (Na2O) – Al2O3 – SiO2 series, with relatively high Mn and P content, which was probably caused by the addition of plant ashes. The physical properties and phase compositions of Yejiashan proto‐porcelain show that firing processes were still in the early stages of development in ancient China. Multivariate statistical analyses indicated that Yejiashan proto‐porcelain might have come from the Deqing area, in Zhejiang Province. These results provide new archaeological evidence for research on issues related to material flow in the Western Zhou dynasty.  相似文献   
32.
One of the most intriguing questions for archaeologists studying clay artefacts concerns technologies employed in their manufacture and whether standardization can be demonstrated through traditional ceramic analysis. Visual comparisons and mechanical measurements have been used to determine correlations and infer standardization. Using a laser multi‐line scanner and software developed to quantify Hausdorff distances between vertices in 3D surfaces, we analysed sample collections of figurines and moulds from Belize, Mexico and Honduras. The results indicated that this procedure was a more precise indicator of common source and standardization in moulded clay artefacts. This method provided data relevant to assessing the scope of ancient trade networks and the nature of social and economic relationships that existed among the ancient inhabitants of Mesoamerica.  相似文献   
33.
34.
35.
36.
A sweeping reassessment of the role of ritual, ceremony, and aesthetics took place in anglophone Protestantism between the late eighteenth and the late nineteenth centuries. While the nineteenth‐century developments themselves have been extensively studied, little scholarly attention has been paid to the importance of the earlier emergence of philosophical language capable of explaining and justifying, in a Protestant context, the ritual and aesthetic dimensions of religious practice. I argue that this language, paradoxically, grew out of a symbiosis of sceptical modernity, traditional religious apologetics, and the religious “enthusiasm” of the early eighteenth century. I approach the topic through the interconnected oeuvres (and careers) of David Hume and Joseph Butler, presenting the first synoptic account of their ideas about the psychological underpinnings of religious worship, and the use made of their ideas by later generations of anglophone Protestants. As mainstream Anglicans, Episcopalians, and Presbyterians confronted the challenges presented by Methodism and Evangelicalism, they found support in a synthesis of Butler's and Hume's ideas. Eventually, the beneficial role of ritual and aesthetics in religious worship came to be widely accepted throughout the anglophone Protestant world.  相似文献   
37.
38.
Shear walls are important lateral force-resistant components of tall buildings. Hence, a reliable numerical model that can accurately represent the mechanical characteristics and large deformations of shear walls is critical for realistic collapse simulation of tall buildings. Based on the theory of generalized conforming element, a high-performance quadrilateral flat shell element, NLDKGQ, accounting for the large deformation using the updated Lagrangian formulation, is proposed herein and implemented in OpenSees. The reliability of NLDKGQ is validated using classical benchmark problems and reinforced concrete specimens. In addition, its capability in simulating the collapse of a tall building is also demonstrated.  相似文献   
39.
The area of La Caleta, north‐west of Cadiz, is a key location for studies of the relationship between the Phoenician city of Gadir and the ocean. The port channel and the small islets that characterize the area was one the busiest sectors of the city, and there are abundant underwater remains attesting to past commercial activities. The area also had an important religious role: two sanctuaries were located at the western end of the rocky promontories that surround the channel, and many items identified as offerings have been found. This article synthesizes previous research and provides an overview of the results of a recent project (2008–2010), which enables a thorough review of the development of the seascape and its use during the 1st millennium BC.  相似文献   
40.
ABSTRACT

The emerging problem of left-behind children has attracted mounting academic and policy attention. Prior studies primarily cast light on left-behind children’s education, health, and behavior, while their subjective well-being is much less understood yet. Based on a nationally representative sample of rural children aged 10–15 in 2014, we examine the impacts of different types of parental migration on children’s subjective well-being and how these affects vary between boys and girls. The results show that parental migration is a double-edged sword: children from both-parent migrant families report compromised life satisfaction and relationship quality compared with those in integral families, and mother-only migration significantly lowers children’s subjective health. On the flip side, father-only migration enhances children’s aspiration for attaining college, an encouraging effect that is even stronger than that of parental education and family income. These effects are heterogeneous by children’s gender: boys seem to be more susceptible to the disruptive effects of both-parent migration; mother-only migration effectively promotes girls’ educational aspiration while father-only migration promotes boys’. This study portrays a comprehensive image of left-behind children. Relaxation of hukou restriction, equal access to education, and revitalization of rural economies are imperative to improve the well-being of left-behind children.

Abbreviations: LBC: Left-behing children; SWB: subjective well-being  相似文献   
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