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   688篇
  免费   55篇
  2024年   1篇
  2023年   23篇
  2022年   3篇
  2021年   9篇
  2020年   35篇
  2019年   35篇
  2018年   104篇
  2017年   75篇
  2016年   69篇
  2015年   48篇
  2014年   39篇
  2013年   146篇
  2012年   32篇
  2011年   25篇
  2010年   12篇
  2009年   14篇
  2008年   13篇
  2007年   11篇
  2006年   2篇
  2005年   2篇
  2004年   1篇
  2003年   3篇
  2002年   4篇
  2001年   9篇
  2000年   4篇
  1999年   1篇
  1998年   1篇
  1997年   4篇
  1996年   2篇
  1995年   7篇
  1994年   2篇
  1993年   2篇
  1992年   3篇
  1982年   1篇
  1979年   1篇
排序方式: 共有743条查询结果,搜索用时 15 毫秒
51.
This paper explores regional (département or NUTS3) income inequality in France between 1860 and 1954. To this end we first document the existing evidence, evaluate the estimation methods and findings, assess the suitability of each approach and address potential concerns. We then present our own subnational estimates of per-capita income, derived following Geary and Stark. Overall, we find that indirect estimation (or top-down) methods provide somewhat differing results, thereby calling into question the validity of some of these approaches. Our estimates, meanwhile, appear to fit reasonably well with direct estimations (or bottom-up) of value-added and income and provide evidence in support of a decline in regional inequality over the period of study.  相似文献   
52.
This article analyses the evolution of Community expenditure, on the basis of the data given in the budget and in the EDF, from the origin of the process in 1957 until the year 2002, the last definitive figures. The technique of principal component factor analysis has been applied to these variables. The basic objective of this study is to detect the interrelationships among the policies of the Union and to effect a classification of them, in order to detect the priorities of the European project and to estimate the dimension of the impact of its policies during the period.  相似文献   
53.
54.
The Qhapaq-Ñan Project promotes the integration of shared cultural values among six countries: Argentina, Chile, Bolivia, Peru, Ecuador and Colombia. These countries are collaborating to nominate the Main Andean Road or “Qhapaq-Ñan” for inclusion on UNESCO’s World Heritage List. Although the participants envision local and Indian communities as the true beneficiaries of the project, and the archaeological effort is already under way, communities associated with the road have not been involved. (At the very moment we are editing this article (March 2007) Argentina is holding the first meeting about a project that is already five years old, with some of the Indian communities of the territories where the project will be carried out. The participation, however, was far below what we expected.). Following the guidelines of the World Archaeological Congress and the current emphasis of many heritage professionals on community participation, we strongly advise that these dynamics must be changed and that the program must be developed jointly with affected communities from the beginning of the project and not in subsequent steps, or (even worse) once the project already taken shape.  相似文献   
55.
This paper records a conversation that took place on Thursday 23rd November 2006 at the Museo del Hombre de Antofagasta de la Sierra (Museum of Man of Antofagasta de la Sierra), Catamarca, Argentina. The conversation involved different research groups co-investigating, each formed by a student of archaeology and a member of the personnel of the museum and/or other areas of the culture of the municipality of Antofagasta de la Sierra. Each presented the state of his/her enquiry into a particular object in the museum collection. The task was to tie stories to objects: stories by the elders of the town, the people who had discovered the item, the personnel of the museum and the texts written by archaeologists. This paper focuses on the conversation with Ernestina Mamaní, about a stone slab by Antofagasta elder, Don Anacleto Cháves, which she and Laura Roda had chosen to research.
Résumé Cet article rapporte une conversation qui a eu lieu le jeudi 23 novembre 2006 au Museo del Hombre de Antofagasta de la Sierra (Musée de l'homme d'Antofagasta de la Sierra), Catamarca, Argentine. La conversation mettait en scène différents groupes de recherche travaillant conjointement, chacun constitué d’un étudiant en archéologie, d’un membre du personnel du musée et/ou d'autres secteurs du service de la Culture de la municipalité d'Antofagasta de la Sierra. Chacun a présenté l'état de ses recherches autour d’un objet particulier des collections de musée. Il s’agissait d’accoler des récits aux objets: histoires rapportées par les anciens du village, les personnes ayant découvert l'objet, le personnel du musée et les rapports écrits par les archéologues. Cet article relate particulièrement la conversation avec Ernestina Mamaní, au sujet d'une dalle de pierre faite par un ancien d'Antofagasta, Don Anacleto Cháves, qu’elle même et Laura Roda avaient choisie pour leur recherche.

Resumen Esta ponencia registra una conversación que sucedió el jueves 23 de noviembre de 2006 en el Museo del Hombre de Antofagasta de la Sierra, Catamarca, Argentina. La conversación involucraba diferentes grupos de co-investigación, integrado por una estudiante de arqueología y un miembro del personal del museo y/o otras areas de cultura de la municipalidad de Antofagasta de la Sierra. Cada una presentaba el estado de su indagación acerca de un objeto particular de la colección del museo. La consigna era anudar historias a cada objeto, historias ofrecidas por los ancianos del pueblo, los descubridores de la pieza, el personal del museo y los textos escritos por arqueólogos. Esta ponencia se focaliza en la conversación con Ernestina Mamaní, sobre una laja encontrada por un vecino de Antofagasta, Don Anacleto Cháves, que ella y Laura Roda habían elegido para investigar.
  相似文献   
56.
57.
The recording and 3D modelling of complex archaeological sites is usually associated with high capital and logistical costs, because the data acquisition must be performed by specialists using expensive surveying sensors (i.e., terrestrial laser scanners, robotic total stations and/or ground‐penetrating radar). This paper presents a novel, low‐cost, user‐friendly photogrammetric tool for generating high‐resolution and scaled 3D models of complex sites. The results obtained with unmanned aerial vehicle (UAV) photogrammetry of an archaeological site indicate that this approach is semi‐automatic, inexpensive and effective, and that it guarantees quality.  相似文献   
58.
This paper evaluates the impact of accessibility on the productivity of Spanish manufacturing firms. We suggest the use of accessibility indicators of workers and commodities, integrating transport, land use, and individual components, computing real distances or traveling times using the Spanish full road network. Estimated firms’ total factor productivity is explained as a function of the accessibility indicators and additional control variables. Results evidence the crucial role on firms’ productivity to the accessibility of commodities and to a slightly lesser extent the workers.  相似文献   
59.
Particle-induced X-ray emission (PIXE), X-ray diffraction (XRD), electron microprobe analysis (EDS) and scanning electron microscopy (SEM) analytical techniques were used to characterize surface paints in pre- and post-fired Aguada Portezuelo decorated pottery. Surface paintings in black, white, red, brown, burgundy and ochre were analysed. Major, minor and trace elements were detected by PIXE, whereas XRD and SEM-EDS gave information on the main mineral phases and the characteristic morphology for each analysed pigment. The results obtained indicate that the main colour groups can be easily discriminated by PIXE, and they are characterized by only one pigment for each colour: hematite (red) and manganese mineral oxides (black), respectively, whereas white pigments are characterized by calcite, ghelenite and gypsum.  相似文献   
60.
We analyse the isotopic values (δ13C, δ15N) of the diet of pre-Columbian horticulturalist populations from tropical and subtropical areas of southeastern South America, belonging to the Guarani and Taquara archaeological units. The data indicate different trends in each one (T?=?4.21; P?=?0.0004), showing a mixed diet with maize consumption in the Guarani samples (δ13Cco?=??15.5?±?1.8‰; δ13Cap ?10.4?±?0.8‰) and a depleted one in the Taquara ones (δ13Cco ?18.2?±?1.7‰; δ13Cap ?11.9?±?0.9‰), with a significant internal dispersion in both populations. The first population has higher nitrogen values (δ15N 11.1?±?0.6‰) compared to the Taquara samples (δ15N 9.3?±?1‰), suggesting a more carnivorous diet. The recognition of these pre-Columbian mixed diets involves the identification of maize cultivation on the Atlantic side of the southernmost area of South America (Parana Delta, 34° SL). Through the analysis of δ18O we have identified two isotopic ecozones, the first along the Paraná River Valley, with an average value of δ18O ?3.7?±?0.5‰ (CV?=?13.5%; CI?=??3.83 / ?3.16), and the second one, located in the Planalto of southern Brazil (Araucaria Forest), with a mean value of δ18O ?1.5?±?0.3‰ (CV?=?16.5%; CI?=??1.69 / ?1.29). The isotopic data (δ13C, δ15N and δ18O) suggest human movements between these two ecozones.  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