全文获取类型
收费全文 | 2000篇 |
免费 | 130篇 |
专业分类
2130篇 |
出版年
2024年 | 4篇 |
2023年 | 4篇 |
2021年 | 21篇 |
2020年 | 30篇 |
2019年 | 138篇 |
2018年 | 88篇 |
2017年 | 97篇 |
2016年 | 148篇 |
2015年 | 110篇 |
2014年 | 109篇 |
2013年 | 380篇 |
2012年 | 101篇 |
2011年 | 119篇 |
2010年 | 95篇 |
2009年 | 66篇 |
2008年 | 90篇 |
2007年 | 87篇 |
2006年 | 53篇 |
2005年 | 28篇 |
2004年 | 46篇 |
2003年 | 40篇 |
2002年 | 26篇 |
2001年 | 24篇 |
2000年 | 33篇 |
1999年 | 5篇 |
1998年 | 17篇 |
1997年 | 18篇 |
1996年 | 15篇 |
1995年 | 18篇 |
1994年 | 16篇 |
1993年 | 6篇 |
1992年 | 8篇 |
1991年 | 5篇 |
1990年 | 4篇 |
1989年 | 6篇 |
1987年 | 8篇 |
1986年 | 3篇 |
1985年 | 5篇 |
1984年 | 5篇 |
1983年 | 3篇 |
1982年 | 5篇 |
1980年 | 6篇 |
1979年 | 8篇 |
1978年 | 2篇 |
1977年 | 8篇 |
1976年 | 3篇 |
1975年 | 5篇 |
1974年 | 3篇 |
1969年 | 2篇 |
1968年 | 2篇 |
排序方式: 共有2130条查询结果,搜索用时 15 毫秒
81.
M. Snchez De la Torre L. M. García‐Simn F.‐X. Le Bourdonnec R. Domingo 《Archaeometry》2019,61(6):1233-1245
82.
This paper presents new compositional analysis of 26 fragments of the much‐debated cylindrical and ovoid jars, a vessel type first defined at Khirbet Qumran and associated with the Dead Sea Scrolls. The new samples include 15 examples from Tel ?evron, a site which yielded a pottery workshop and that carries certain similarities with Khirbet Qumran during the Early Roman period, as well as several examples from Jericho and Masada. According to the new as well as previous analyses, many of these jars were produced in the ?evron area; another source may be located in the northern Dead Sea area. The actual function of these jars, and whether they ever contained scrolls, is still unclear. 相似文献
83.
V. Flores‐Als F. J. Alejandre F. J. Blasco‐Lpez M. Torres‐Gonzlez C. Núez 《Archaeometry》2019,61(5):1097-1110
The Royal Artillery Factory of Seville in Spain originated from pre‐existing private bronze foundries dating from the 16th century. The paper analyses the stratigraphy of wall cladding in the areas traditionally known as the ‘Old Foundry’ and the ‘New Foundry’, through its characterization by optical microscopy, scanning electron microscopy with energy‐dispersive X‐ray spectrometry (SEM‐EDX), micro‐X‐ray fluorescence (μ‐XRF) and micro‐X‐ray diffraction (μ‐XRD), in order to analyse the metal deposits that have accumulated since the 17th century. The data obtained allowed the verification of the available historiographical information and the location of the original bronze smelting furnaces. The analysis of patinas deposited on the overlapping layers of lime also confirmed that neither the raw materials nor the composition of the alloys used presented any substantial changes. 相似文献
84.
S. A. Collins‐Elliott 《Archaeometry》2019,61(5):1207-1222
This paper presents a new method for estimating the amount of an artefact class in use at a given moment in the past from a random assemblage of archaeological finds. The method is based on the use of simulation, since an analytical solution is computationally impractical. Estimating the number of artefacts in use at any time t is shown to follow a Poisson distribution, which allows for credible intervals to be established using the Jeffreys prior. This estimator works from minimal assumptions about the dating and duration of finds, as well as the intensity of collection, and is applied to coinage from four Roman‐period sites excavated by the Roman Peasant Project (2009–14). The result provides an estimation of the abundance of material according to an interval of certainty. 相似文献
85.
86.
In crime analyses, maps showing the degree of risk help police departments to make decisions on operational matters, such as where to patrol or how to deploy police officers. This study statistically models spatial crime data for multiple crime types in order to produce joint crime risk maps. To effectively model and map the spatial crime data, we consider two important characteristics of crime occurrences: the spatial dependence between sites, and the dependence between multiple crime types. We reflect both characteristics in the model simultaneously using a generalized multivariate conditional autoregressive model. As a real‐data application, we examine the number of incidents of vehicle theft, larceny, and burglary in 83 census tracts of San Francisco in 2010. Then, we employ a Bayesian approach using a Markov chain Monte Carlo method to estimate the model parameters. Based on the results, we detect the crime hotspots, thus demonstrating the advantage of using a multivariate spatial analysis for crime data. 相似文献
87.
Dborah Delaunay Philippe Apparicio Anne‐Marie Sguin Jrmy Gelb Mathieu Carrier 《The Canadian geographer》2019,63(2):184-197
Quiet urban areas are places with low noise levels that can help people to support physical and mental wellness. This paper has two objectives: to identify quiet urban areas in Montreal and to check for the presence of environmental inequities in access to such areas for vulnerable groups (children, older people, low‐income individuals, and visible minorities). Using a GIS‐based methodology, 2,282 quiet urban areas were identified in Montreal. The results of a mixed effects logistic regression model analysis showed that there are no major inequities in access to quiet urban areas for the population groups studied. The analysis did, however, revealed substantial spatial disparities in terms of the distribution of quiet urban areas across the boroughs and municipalities examined. 相似文献
88.
The paper analyses the emergence of the Artificial Intelligence (AI) cluster in Montreal and investigates two questions: (1) What are the different theoretical interpretations related to the emergence of industrial cluster? And (2) What are the factors underlying the emergence of the AI cluster in Montreal and to what extent have local and global factors been decisive in this respect? The AI cluster emerges through a process that brings into play the interaction between the local initial conditions and the birth of a new industry. Moreover, it also involves an interaction between the local and the global, which is supported by interactions with foreign actors located in different parts of the world. 相似文献
89.
This paper analyzes the long‐term transformations of the occupational structure in 50 provinces of Spain with a view to ascertain the existence and assess the extent of employment polarization. The peculiar characteristics of this country, namely rigid labor markets and the relatively recent transition to democracy, make for an interesting addition to existing studies on this topic. In line with previous literature on other countries, we find a strong association between the decline of “routine” mid‐skill jobs and the expansion of low‐skill service employment as well as differential labor market outcomes by levels of formal education. Results are robust to various controls and instrumental variables that account for long‐term industry specialization. We also find a positive local multiplier effect of high‐skilled workers on the demand for nontradable service jobs. 相似文献
90.
Luis Xavier Lpez‐Farjeat Jos Alfonso Ganem Gutirrez 《Muslim world (Hartford, Conn.)》2019,109(4):546-560