全文获取类型
收费全文 | 1155篇 |
免费 | 83篇 |
出版年
2024年 | 8篇 |
2023年 | 23篇 |
2022年 | 11篇 |
2021年 | 6篇 |
2020年 | 57篇 |
2019年 | 29篇 |
2018年 | 95篇 |
2017年 | 97篇 |
2016年 | 86篇 |
2015年 | 52篇 |
2014年 | 49篇 |
2013年 | 287篇 |
2012年 | 42篇 |
2011年 | 44篇 |
2010年 | 28篇 |
2009年 | 30篇 |
2008年 | 28篇 |
2007年 | 12篇 |
2006年 | 20篇 |
2005年 | 20篇 |
2004年 | 9篇 |
2003年 | 11篇 |
2002年 | 15篇 |
2001年 | 14篇 |
2000年 | 10篇 |
1999年 | 8篇 |
1998年 | 12篇 |
1997年 | 6篇 |
1996年 | 10篇 |
1995年 | 8篇 |
1994年 | 9篇 |
1993年 | 14篇 |
1992年 | 7篇 |
1991年 | 10篇 |
1990年 | 10篇 |
1989年 | 8篇 |
1988年 | 7篇 |
1987年 | 7篇 |
1986年 | 10篇 |
1985年 | 2篇 |
1982年 | 5篇 |
1981年 | 5篇 |
1977年 | 2篇 |
1972年 | 2篇 |
1970年 | 1篇 |
1969年 | 2篇 |
1962年 | 1篇 |
1959年 | 2篇 |
1956年 | 1篇 |
1950年 | 3篇 |
排序方式: 共有1238条查询结果,搜索用时 0 毫秒
151.
Stéphane Dray 《Geographical analysis》2011,43(2):127-141
The computation of Moran's index of spatial autocorrelation requires the definition of a spatial weighting matrix. The eigendecomposition of this doubly centered matrix (i.e., one that forces the sums of all rows and columns to equal zero) has interesting properties that have been exploited in various contexts: distribution properties of the Moran coefficient (MC), spatial filtering in linear models, generalized linear models, and multivariate analysis. In this article, this eigendecomposition is used to propose a new view of MC based on its interpretation in the simple context of linear regression. I use this interpretation to demonstrate the different properties of MC and also the inefficiency of this index in some situations involving simultaneous positive and negative spatial autocorrelation. I propose some new statistics and procedures for testing spatial autocorrelation, and conduct a simulation study to evaluate these new approaches. 相似文献
152.
貝內迪克特 《Revue de synthèse / Centre international de synthèse》2011,132(1):33-52
At the crossroads of institutions, markets ands discourses, artistic expertise under the reign of Louis XIV has not been thoroughly studied. So-called "experts" belonged to the judiciary field: they were called upon to describe, attribute and evaluate paintings and sculptures in probate inventories or in the context of judiciary actions. Their appointment was a real performative act, since experts were chosen by the judge or the parties, without definite criteria. Therefore, experts were often - but not always - artists, either guild masters or academicians. 相似文献
153.
奧荷莉 《Revue de synthèse / Centre international de synthèse》2011,132(3):369-386
The study of the financing of documentary films in France by its two main sources (TV channels and the film industry) enables us to uncover the conditions of possibility of the autonomy of filmmakers. It reveals an opposition between two patterns: a logic of “flows” within the audiovisual circuit (television) and a logic of “scarcity” within the film circuit, completed by new forms of financial support. 相似文献
154.
155.
An illustrated methodology for the morphodynamic sectoring of the Neigette River (Québec) Fluvial hydrogeomorphology is little recognized in policy management and planning in Québec. A better understanding would result in more enlightened planning for waterways. The deficiency could result from the fact that too few methodologies have been developed that take account of the particular nature of Québec rivers. This study tests the applicability of a methodology of dividing rivers into homogeneous morphodynamic units. This compartmentalization results from the analysis of longitudinal changes in stream power, sedimentary composition of the banks, channel entrenchment, and planform geometry. The method is tested on a section of the Neigette River, which encompasses a wide variety of forms and processes frequently found in Québec rivers. Results suggest the presence of three morphodynamic sections: wandering with multiple channels, dynamic meandering and stable meandering. The method provides an effective basis for discriminating between these morphodynamic environments and their respective limits. Stream power is the variable with the greatest discriminating capacity. The efficacy of the approach, the ease of its application, and its flexibility make this a valuable tool for the management of fluvial environments. 相似文献
156.
This paper constitutes a synthesis of a technological investigation on copper base alloy weapons from Byblos. Most of the weapons are typical of the Middle Bronze Age in the Levant. Methods such as metallographic examination and chemical analyses by EDS were used to identify the different stages of the chaîne opératoire used in the making of these weapons. The results reveal precise information regarding the production of several types of weapons such as the type and performance of the moulds used for casting and the deformation process. Furthermore, these results highlight the contribution of economic and cultural factors in the choice of components in a copper base alloy recipe. Finally, the use of silver–copper brazes for joining copper base alloy objects is recorded for the first time for the period and region concerned. 相似文献
157.
Pauline Burger Armelle Charrié-Duhaut Jacques Connan Pierre Albrecht 《Archaeological and Anthropological Sciences》2011,3(2):185-200
Plant and particularly non-wood forest products have played an important role in the evolution of human cultures all over
the world, as source of food but also of raw substances fulfilling material, spiritual, and medicinal requirements. Plant
exudates and particularly dammar resins (Dipterocarpaceae family) were widely used in the past in Asia notably as waterproofing
and caulking materials. This study focuses on the GC–MS chemical characterisation of freshly collected dammars and establishes
new molecular parameters enabling discrimination between dammars and other types of plant resin, whatever their botanical
origin. Such analyses provide clues for a precise identification (taxonomy, occurrence of other material in addition to the
resin, alteration state) of unknown resinous material discovered in archaeological contexts. The value of our approach is
illustrated by the taxonomic characterisation of two samples collected in jars from the Brunei wreck and a Chinese junk lost
more than 40 km off the Sultanate of Brunei during the end of the fifteenth century or the early beginning of the sixteenth
century. 相似文献
158.
Lynn Biggs Bérénice Bellina Marcos Martinón-Torres Thomas Oliver Pryce 《Archaeological and Anthropological Sciences》2013,5(4):311-329
This article presents a preliminary attempt to characterise Upper Thai-Malay Peninsula prehistoric iron technologies based on assemblages from two recently excavated coastal sites: Khao Sam Kaeo and Phu Khao Thong. These are the earliest known sites involved in the early trans-Asian exchange that connected the eastern Indian Ocean to the South China Sea from the mid-first millennium bc. It is from this period that iron assemblages start appearing at both continental and insular Southeast Asian sites. Three models have been offered confronting an indigenous vs. Chinese or South Asian impetus for the introduction of iron metallurgy in Southeast Asia. These models are discussed in the light of the metallographic and compositional analyses of iron and slag assemblages from these two sites using optical microscopy, scanning electron microscopy with energy dispersive spectrometry, energy dispersive X-ray fluorescence and slag inclusion analysis techniques, together with other production materials from these and other contemporaneous Southeast Asian sites. 相似文献
159.
160.
Helene Brembeck Barbro Johansson Kerstin Bergström Pontus Engelbrektsson Sandra Hillén Lena Jonsson 《Children's Geographies》2013,11(1):74-88
In this article, we discuss children's becoming as food consumers in the intersection of various foodscapes. We draw from a project, Children as co-researchers of foodscapes, where we have been working with children as co-researchers, using basically ethnographic methods, and as co-designers in a collaborative design effort. This article focuses on the findings from a theoretically inspired perspective, using the concept of foodscapes. These are food-related structures of different kinds, which evolve as the child explores them and where children as food consumers are generated. In this article, we highlight the scapes of taste, routines, people, things, commerce, child (as opposed to adult) and health and give brief accounts of the way the children related to them. Finally, we turn to the benefits of working with foodscapes for a better understanding of children's becoming as food consumers in the intersection of various foodscapes. This article is based on data gathered by the children, but also on our fieldwork notes and observations following the children in their foodscapes. 相似文献