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   90篇
  免费   8篇
  2024年   1篇
  2023年   4篇
  2022年   1篇
  2020年   4篇
  2019年   3篇
  2018年   6篇
  2017年   7篇
  2016年   4篇
  2015年   6篇
  2014年   3篇
  2013年   22篇
  2012年   5篇
  2011年   4篇
  2010年   6篇
  2009年   6篇
  2008年   3篇
  2007年   3篇
  2006年   3篇
  2004年   1篇
  2003年   1篇
  2002年   1篇
  1997年   1篇
  1996年   1篇
  1983年   1篇
  1976年   1篇
排序方式: 共有98条查询结果,搜索用时 15 毫秒
51.
This paper examines the evolution of territorial imbalances in per capita income in the Central and Eastern Europe regions between 1990 and 2001. In order to overcome the limitations of conventional convergence analysis, we have combined a non-parametric approach that allows us to study the dynamics of the entire cross-section distribution, with a series of theoretical results and measures taken from the literature on personal income distribution. The results obtained show an overall reduction in regional inequality over the study period. This process has been compatible with the simultaneous presence of between-country convergence and within-country divergence. Likewise, we have observed a reduction in the development gap between the sample regions and Western Europe. In any event, the polarization of the distribution under consideration has decreased, while the registered level of intra-distribution mobility is relatively low. Furthermore, the analysis highlights the important role played in explaining the distribution dynamics by factors such as the national component, spatial location, productive structure, agglomeration economies and the percentage of gross domestic product devoted to investment.  相似文献   
52.
A reliable assessment of historical metallic tie-rods requires both the estimation of actual tensile load and the identification of dominant defects. Despite high defectiveness resulting from traditional metalworking techniques, so far the latter aspect has not been duly addressed in the literature. In this article, several methodologies are discussed aimed at integrating the usual inspection practice. All studies were performed on the tie-rods of Milan Cathedral. Metallurgical analyses allowed to recognize the main features of the material. Mechanical characterization in the perspective of Elasto-Plastic Fracture Mechanics (EPFM) indicated the conditions for crack propagation. Several Non-Destructive Techniques (NDTs) commonly used in Mechanical Engineering (i.e., guided waves, eddy currents, pulsed active thermography) were examined and adapted to this unconventional application. Based on the combination of all the mentioned methods, a multidisciplinary procedure was defined, which allows the evaluation of the crack significance with reference to the estimated working stress.  相似文献   
53.
The Port‐Vendres 4 shipwreck is evidence of coastal export trade between Hispania Citerior and Narbonne in 40/30 BC. The cargo is made up of a particular assemblage of Roman wine amphoras (Pascual 1, Dressel 1B and Lamboglia 2) destined for Gallic markets. Archaeological and archaeometric analyses conducted on a selection of the amphoras allowed the provenance of the cargo to be identified as Hispania Citerior and the central‐southern Tyrrhenian coast of Italy. Iluro and/or Baetulo are proposed as the ports of departure, enabling the reconstruction of the trade route and the historical and economic significance of this shipwreck.  相似文献   
54.
55.
The determination of the chemical composition of different parts of wall paintings (pigments, mortars and binders) provides information about technology of preparation of an artefact. Herein, we present a multi-methodological characterisation of wall paintings from a Roman archaeological site in Cuma, focusing on differences between an indoor (domus) and outdoor fabrication (a temple, Tempio con Portico (TCP)). Both pigments, binders and mortars were studied via a combination of destructive/μ-destructive (mass spectrometry, ionic chromatography, ICP-based techniques) and non-destructive (Raman microscopy, small-angle neutron scattering (SANS) and X-ray diffraction) methodologies. Particularly, the systematic presence of dolomite only in mortars from TCP may suggest an intentional use of such limestone for the outdoor fabrication of public interest. Differences between TCP and domus are also related to the composition of the pigment binder. In particular, the detected binders (studied by LC-MS/MS and GC-MS) were proteinaceous in the case of domus (possibly egg and animal glue) and drying oils in the case of TCP. Ultimately, our multi-methodological study provides an overall picture of the material components of paintings from fabrications with different use, proposing a hypothesis on technological choices according to conservative and destination reasons.  相似文献   
56.
Abstract

Far from being a value shared by the country’s political parties, republican Italy’s constitution has given rise to confrontation depending on the interpretations given to it in the main phases of transition of the country’s political system. Antifascism as a fundamental statute of public life, on the one hand, and the great parliamentary system framework, on the other, established the boundaries of democratic legitimacy. Although this process contributed to strengthening the country’s democratic foundations, particularly with regard to the risk of a possible authoritarian swing in the aftermath of World War II, it also affected a political dialectic strongly conditioned by the delegitimizing element underlying the constitutional charter. Attempts at institutional reform as well as opposition to any understanding between the two parties that benefited the most from a literal interpretation of the constitution, that is, the Christian Democratic Party and the Italian Communist Party, often ran the risk of being demonized. This led to a kind of short-circuit which, in the long run, eroded the democratic fabric itself, feeding the spiral of mutual delegitimation that marked the political life of the country in these republican years.  相似文献   
57.
Estimation of age at death is an unavoidable step in the process of human identification, both in forensic practice and in the anthropological and palaeopathological study of skeletal remains. In several cases, in which medical or demographic records are completely lacking, a reliable estimation of the age at death becomes very important. Skeletal remains from archaeological contexts suffer from several biasing factors such as post-mortem changes, taphonomy and various burial practices depending on age, sex and social status of the deceased persons.  相似文献   
58.
59.
There is not only one methodology for the study of mineralogical phases in archaeological samples. In this paper, we discuss a strategy applied to ancient iron nail samples completely based on non-destructive analyses. The archaeological samples come from the archaeological site of Valle delle Forme (province of Brescia–Italy) and date back to the 1300–1400 ad. Neutron-based techniques, like time-of-flight neutron diffraction and neutron tomography, have been used to determine the mineralogical composition and the structure of nails. An independent check for the assessment of the presence of different mineralogical phases was given by Raman spectroscopy. The combination of different non-destructive techniques has provided very useful information on their chemical composition, nature of the patina and corrosion features of the nails (also in the bulk of the samples).  相似文献   
60.
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