1,721,185 research outputs found
L. Jeannin, M. Meneghini, C. Pauti, R. Poupet, Le droit d'asile en Europe. Étude comparée
No full textL. Jeannin, M. Meneghini, C. Pauti, R. Poupet, Le droit d'asile en Europe. Étude comparée. In: Revue internationale de droit comparé. Vol. 52 N°1, Janvier-mars 2000. pp. 269-270
L. Jeannin, M. Meneghini, C. Pauti, R. Poupet, Le droit d'asile en Europe. Étude comparée
No full textL. Jeannin, M. Meneghini, C. Pauti, R. Poupet, Le droit d'asile en Europe. Étude comparée. In: Revue internationale de droit comparé. Vol. 52 N°1, Janvier-mars 2000. pp. 269-270
Temporal analysis of GDOP to quantify the benefits of GPS and glonass combination on satellite geometry
No full textGlobal Navigation Satellite Systems (GNSS) have developed rapidly over the last few years. At present, there are GNSS receivers that combine satellites from two or more different constellations. The geometry of the satellites in relation to the receiver location, i.e. how nearly or distantly they are disposed in the sky, impacts on the quality of the survey, which is essential to achieve the highest level of position accuracy. A dimensionless number identified as Geometric Dilution of Precision (GDOP) is used to represent the efficiency of the satellite distribution and can be easy calculated for each location and time using satellite ephemeris. This paper quantifies the influence of multi-GNSS constellation, in particular GPS (Global Positioning System) and GLONASS (Globalnaya Navigazionnaya Sputnikovaya Sistema) combination, on satellite geometry considering a precise period. A new index named Temporal Variability of Geometric Dilution of Precision (TVGDOP) is proposed and analyzed in different scenarios (different cut-off angles as well as real obstacles such as terrain morphology and buildings). The new index is calculated for each of the two satellite systems (GPS and GLONASS) as well as for their integration. The TVGDOP values enable the three cases to be compared and permit to quantify the benefits of GNSS integration on satellite geometry. The results confirm the efficiency of the proposed index to highlight the better performance of combination GPS+GLONASS especially in presence of obstacles
Rietveld refinement of clinopyroxenes with intermediate Ca-content along the diopside-enstatite join
No full textDifferential anomalous wide-angle X-ray scattering and X-ray absorption experiments to investigate the formation of glass ceramics in the CaO-SiO2-ZrO2 system
No full textThe structure of a CaO-SiO2-ZrO2-based glass ceramic has been investigated by X-ray diffraction, X-ray absorption spectroscopy and differential anomalous scattering techniques as a function of the thermal treatment of the sample. The microstructure of the glass has been investigated at room temperature, before the recrystallization of the glass ceramic, and on two samples annealed at 1073 and 1273 K for 1 h to follow the early stages of nucleation of the quartz and wollastonite crystalline phases. Indications on the roles of Ca, Si and Zr during the devitrification process are given
Rietveld refinement of clinopyroxenes with intemediate Ca-content along the join diopside-enstatite
No full textA methodology for estimating the illicit consumption of cigarettes at the country level
No full textThis paper introduces and discusses a methodology for estimating the scale of illicit consumption of cigarettes at a national level. After reviewing current data gathering approaches and estimates, the paper delineates a methodology to estimate the consumption of each type of illicit cigarette (i.e., counterfeits, illicit whites, smuggled/trafficked genuine cigarettes). The proposed methodology is tested through estimating the size and characteristics of the illicit cigarette market in 27 Member States of the European Union in 2016. The results, which underline the heterogeneity in the quality and in the quantity of the illicit consumption of cigarettes in Europe, are presented along with considerations about the strengths and limitations of the proposed methodology in relation to extant approaches
QGIS Use for IHS PAN-Sharpening Application to Landsat 8 OLI Images
No full textIHS Pan-sharpening is one of the most performed approaches to transfer the higher resolution of panchromatic images to the multispectral ones of the same scene. It requires basic operations that can be easily carried out using GIS software also in absence of specific tools for Pan-sharpening. The aim of this paper is to illustrate the steps to be realized in QGIS, a free and open source software that permits to operate with raster files, to implement IHS Pan-sharpening method. The procedure is applied to Landsat 8 OLI (L8 OLI) images so to reduce pixel dimensions of visible multispectral bands from 30 m to 15 m and produce RGB composition with higher spatial resolution. The quality of the results is tested using appropriate indices such as ERGAS (Erreur Relative Globale Adimensionnelle de Synthèse) and UIQI (Universal Image Quality Index)
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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