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   1363篇
  免费   53篇
  2023年   17篇
  2020年   21篇
  2019年   26篇
  2018年   44篇
  2017年   69篇
  2016年   52篇
  2015年   36篇
  2014年   40篇
  2013年   349篇
  2012年   40篇
  2011年   37篇
  2010年   35篇
  2009年   40篇
  2008年   29篇
  2007年   38篇
  2006年   22篇
  2005年   19篇
  2004年   17篇
  2003年   22篇
  2002年   36篇
  2001年   26篇
  2000年   23篇
  1999年   54篇
  1998年   44篇
  1997年   21篇
  1996年   14篇
  1995年   14篇
  1994年   13篇
  1993年   6篇
  1992年   9篇
  1991年   6篇
  1989年   9篇
  1988年   7篇
  1987年   10篇
  1986年   8篇
  1985年   7篇
  1984年   5篇
  1983年   9篇
  1982年   9篇
  1981年   7篇
  1980年   12篇
  1979年   11篇
  1978年   6篇
  1977年   14篇
  1975年   10篇
  1974年   5篇
  1973年   7篇
  1972年   6篇
  1970年   5篇
  1959年   4篇
排序方式: 共有1416条查询结果,搜索用时 15 毫秒
81.
Ungulate footprint-tracks provide information regarding the species and age of animals. Combined with other datasets, this contributes to interpretation of seasonal husbandry patterns in the Severn Estuary, focusing on Bronze Age intertidal footprint-tracks at Redwick and Goldcliff East and the Late Neolithic site of Oldbury. Metric dimensions and morphology of modern contemporary ungulate footprint-tracks are used as analogues to help understand the species and age of prehistoric ungulates. Findings indicate that Dexter cattle and Soay sheep are metrically similar to British prehistoric ungulates. The prehistoric sites have a concentration of neonatal and juvenile individuals. Along with evidence provided by environmental data, faunal skeletal assemblages and lipid and isotopic analysis, this leads to the conclusion that the presence of younger animals and evidence at Brean Down for dairying is consistent with saltmarsh grazing activity in spring and summer.  相似文献   
82.
83.
84.
David W. Hill  Daryl Martin 《对极》2017,49(2):416-436
In this paper, we argue for an ethical understanding of exurban environments, which we propose as symptomatic spaces of neoliberalization. We outline the idea that civility within public places is a mode of moral communication grounded in everyday encounters and embedded in the ordinary places in which they are enacted. We also advance the argument that exurban environments, as properties of neoliberal capital, employ distinct strategies to monopolize the use of space and encourage its inattentive occupation. We illustrate this through our case study in the North of England, a business and retail park which we suggest as typical of spaces produced through wider processes of neoliberalization. We conclude with a discussion of the implications of the writers and theories explored throughout the piece for a critical understanding of place, one that is premised on the importance of a quotidian understanding of the social, an everyday morality.  相似文献   
85.
Grasslands pose a particular problem for archaeological survey involving artifact assessment, as no material is plowed up to the surface. Although finds in molehills are often the only source of information available on sites with such low visibility, an archaeology of molehills has thus far been largely disregarded. Yet, by applying a low-cost and time-efficient methodology, both the potential and the pitfalls of molehill archaeology come to the forefront. At the medieval harbor site of Monnikerede, it was possible to assess material culture and to locate certain structural elements. However, when artifact densities were compared with the underlying geophysical anomalies, a more complex relationship appeared at the level of individual features.  相似文献   
86.
Roman plasters sampled from different houses at the archaeological site of Herculaneum, Italy, (2010–12) were studied by means of petrography, thermal analysis and X‐ray fluorescence. Herculaneum plasters are composed by preparatory layers (arriccio) with a thickness of several centimetres and are based on a calcitic binder and volcanic scoriae as aggregates, covered by a thin final layer characterized by a low granulometry. Most of the sampled plasters can be placed into two groups based on the aggregate composition and classified as marmorino or intonachino. However, a similar aggregate composition did not induce superimposable thermal behaviour, thus suggesting that the samples underwent different ageing/weathering processes, with a consequent change of the ratio among the components.  相似文献   
87.
Radon (Rn) is a potentially toxic gas in soil which may affect human health. Assessing Rn levels in soil gas usually requires enormous efforts in terms of time and costs, since the sampling protocol is very complex. In most cases, the variable under study is sparsely sampled over the domain and this could affect the reliability of the spatial predictions. For this reason, it is useful to incorporate, into the estimation procedure, some auxiliary variables, correlated with the in soil gas Rn concentrations (primary variable) and more densely available over the domain. On the basis of this latter aspect, it is even better if the covariates are derived from a geographical information system (GIS). In this article, the Rn sampling protocol used during a measurement campaign planned over a risk area is described and the process of deriving GIS covariates considered as secondary information for predicting the primary variable is clarified. Then, multivariate modeling and prediction of the Rn concentrations over the domain of interest are discussed and a comparative study regarding the performance of the prediction procedures is presented. Rn prone areas are also analyzed with respect to urban and school density. All these aspects can clearly support decisions on environmental and human safeguard.  相似文献   
88.
This paper explores the integration of chemical data with metric studies and spatial analyses of archaeological artifacts to investigate questions of specialization, standardization, and production organization behind large-scale technological enterprises. The main analytical focus is placed on the 40,000 bronze arrowheads recovered with the Terracotta Army in the First Emperor’s Mausoleum, Xi’an, China. Based on the identification by portable X-ray fluorescence spectrometry of chemical clusters that correspond to individual metal batches, and combined with a study of their context in the tomb complex, we argue that the manufacture of arrows was organized via a cellular production model with various multi-skilled units rather than as a single production line. This system favored more adaptable and efficient logistical organization that facilitated dynamic cross-craft interaction while maintaining remarkable degrees of standardization. We discuss the use of “the batch” as an analytical category and how our method might be applied to other studies of craft organization in complex societies and imperial systems.  相似文献   
89.
Suffolk Place (c. 1518–22), Southwark, was the London residence of Charles Brandon, Duke of Suffolk. This majestic palace is visible in the foreground of Wyngaerde’s London panorama (c. 1544), from which it can be inferred that it possessed a double courtyard plan. The southern and eastern ranges of the outer courtyard of Suffolk Place were apparently adorned with architectural terracottas at both entablature and parapet level. As the palace was demolished in 1557–58, the finds of ex-situ terracottas are a key source of information concerning the decorative scheme of this vanished palace. Petrological study and other research indicates that the terracottas were locally manufactured, implying the existence of a London-area workshop.  相似文献   
90.
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