The Experience of Realizing a Semantic Web Urban Computing Application     

Emanuele Della Valle  Irene Celino  Daniele Dell'Aglio 《Transactions in GIS》2010,14(2):163-181

Urban Computing is a branch of Pervasive Computing that investigates urban settings and everyday lifestyles. A large quantity of information to develop pervasive applications for urban environments is often already available, even if scattered and not integrated: maps, points of interest, user locations, traffic, pollution, and events are just a few examples of the digitalized information which we can access on the Web. Applications for mobile users that leverage such information are rapidly growing. In this article, we report our experience in addressing practical computational issues influencing the use of Geographic Information Systems and geospatial data from the standpoint of semantics and pervasive computing. We refer to the early achievements of the LarKC project, in which we developed an Urban Computing demonstrator. We highlight the positive sides of our experience and we discuss open issues and possible advances.  相似文献   

Syn-Collision Folding and Multi-Layers Detachment in the Molassic Basin,Northeastern Tunisia     

Ramzi  A.  Noureddine  M.  Lassaad  C. 《Geotectonics》2020,54(6):832-843

Geotectonics - Tunisia had been the place of various tectonic episodes which have drawn the actual structural map of the country. The Neogene period was the most active period in which the...  相似文献   

Exploration of the high-redshift universe enabled by THESEUS     

Tanvir  N. R.  Le Floc’h  E.  Christensen  L.  Caruana  J.  Salvaterra  R.  Ghirlanda  G.  Ciardi  B.  Maio  U.  D’Odorico  V.  Piedipalumbo  E.  Campana  S.  Noterdaeme  P.  Graziani  L.  Amati  L.  Bagoly  Z.  Balázs  L. G.  Basa  S.  Behar  E.  De Cia  A.  Valle  M. Della  De Pasquale  M.  Frontera  F.  Gomboc  A.  Götz  D.  Horvath  I.  Hudec  R.  Mereghetti  S.  O’Brien  P. T.  Osborne  J. P.  Paltani  S.  Rosati  P.  Sergijenko  O.  Stanway  E. R.  Szécsi  D.  Tot́h  L. V.  Urata  Y.  Vergani  S.  Zane  S. 《Experimental Astronomy》2021,52(3):219-244

Experimental Astronomy - At peak, long-duration gamma-ray bursts are the most luminous sources of electromagnetic radiation known. Since their progenitors are massive stars, they provide a tracer...  相似文献   

Effects of 2,4,6-trinitrotoluene (TNT) on phase I and phase II biotransformation enzymes in European eel Anguilla anguilla (Linnaeus, 1758)     

Della Torre C  Corsi I  Arukwe A  Alcaro L  Amato E  Focardi S 《Marine environmental research》2008,66(1):9-11

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Impact of Saharan dust on PM10 concentration in the Mediterranean Tunisian coasts     

Karim Bouchlaghem  Blaise Nsom  Noureddine Latrache  Houda Haj Kacem 《Atmospheric Research》2009,92(4):531-539

This paper presents samples of Saharan dust outbreak affecting the Mediterranean Tunisian coasts and its impact on PM10 (Particles with an aerodynamic diameter below 10 µm) surface concentrations measured at seven monitoring stations during summer 2006. During the events, the daily PM10 levels at all stations exceeded EU and Tunisian air quality standard limits which are equal to 50 µg/m³. The maximum values ranged from 200 µg/m³ to 300 µg/m³ depending on the monitoring station. The impact is even more dramatic on PM10 hourly concentrations leading to maximum hourly peaks ranging from 400 µg/m³ to 850 µg/m³ again depending on the monitoring station (industrial or residential, traffic and commercial). Comparison between backward air masses trajectories reaching Tunisian coasts and satellite imageries vis-à-vis the PM10 hourly concentrations measured at the monitoring stations during 2006 evidenced the influence of the Saharan dust outbreaks on surface concentrations. The origin of the air masses is found to be from South-West direction under the influence of air masses from the Algerian Saharan desert.  相似文献   

MEDUSA: The ExoMars experiment for in-situ monitoring of dust and water vapour     

L. Colangeli  J.J. Lopez-Moreno  P. Nørnberg  V. Della Corte  F. Esposito  E. Mazzotta Epifani  J. Merrison  C. Molfese  P. Palumbo  J.F. Rodriguez-Gomez  A. Rotundi  G. Visconti  J.C. Zarnecki 《Planetary and Space Science》2009,57(8-9):1043-1049

Dust and water vapour are fundamental components of the Martian atmosphere. In view of tracing the past environmental conditions on Mars, that possibly favoured the appearing of life forms, it is important to study the present climate and its evolution. Here dust and water vapour have (and have had) strong influence. Of major scientific interest is the quantity and physical, chemical and electrical properties of dust and the abundance of water vapour dispersed in the atmosphere and their exchange with the surface. Moreover, in view of the exploration of the planet with automated systems and in the future by manned missions, it is of primary importance to analyse the hazards linked to these environmental factors. The Martian Environmental Dust Systematic Analyser (MEDUSA) experiment, included in the scientific payload of the ESA ExoMars mission, accommodates a complement of sensors, based on optical detection and cumulative mass deposition, that aims to study dust and water vapour in the lower Martian atmosphere. The goals are to study, for the first time, in-situ and quantitatively, physical properties of the airborne dust, including the cumulative dust mass flux, the dust deposition rate, the physical and electrification properties, the size distribution of sampled particles and the atmospheric water vapour abundance versus time.  相似文献   

The Ñuagapua alluvial fan sequence: Early and Late Holocene human-induced changes in the Bolivian Chaco?     

Mauro Coltorti  Jacopo Della Fazia 《Proceedings of the Geologists' Association. Geologists' Association》2010,121(2):218-126

The Quebrada Ñaguapua alluvial fan provides a record of changes that have affected the Bolivian Chaco during the Holocene. The 4th oldest Unit, possibly related to the last glaciation, is restricted to the fan apex; it was deeply dissected during the Early Holocene, with three other units emplaced within the resultant incision. Sandy sediments characterise Unit 1 and 3 while Unit 2 is a forest soil that marks a period of stability. The oldest Unit 1 was deposited just before 6900 years BP. It contains artefacts that represent the earliest evidence of human occupation and suggests that deposition was perhaps induced by deforestation. Anthropogenic deforestation is evident at the base of Unit 3, which contains a wooden plank (140 years BP), charcoal, ash and charred tree-trunks. Some trunks have been burnt in situ while others survived the fire and are still growing, although their roots emanate from Unit 2. Although, similar events slightly to the north have been attributed to climatic changes, the delay in soil erosion in closely spaced areas could be plausibly attributed to human-induced changes. Megafaunal remains in Unit 1 represent the last occurrence of megafauna, including horse, in South America. The faunal association is anomalous because of the concurrent presence of aquatic, forest and open-environment species. We suggest that the last migrated from the southern part of Continent, where ecologic conditions allowed their survival in the Early Holocene, after the widespread clearing of the natural forest and shortly prior to the extinction of the Magafauna.  相似文献   

Winter and summer characterization of biogenic enantiomeric monoterpenes and anthropogenic BTEX compounds at a Mediterranean Stone Pine forest site     

Wei?Song  Jonathan?WilliamsEmail author  Noureddine?Yassaa  Monica?Martinez  José?Antonio?Adame?Carnero  Pablo?J.?Hidalgo  Heiko?Bozem  Jos?Lelieveld 《Journal of Atmospheric Chemistry》2011,68(3):233-250

Measurements of biogenic gases including enantiomeric monoterpenes and isoprene, and anthropogenic gases such as benzene, toluene, ethylbenzene, ortho-, meta- and para- xylene (BTEX) compounds were made by GC-MS in November and December 2008 within a stone pine (Pinus pinea L) forest located on the Southwest coast of Spain (37.10°N, 6.70°W). Mixing ratios of the biogenic species were found to be low (mean circa 10 pptv) consistent with previously observed low wintertime regional forest emission rates. In contrast, anthropogenic species were significantly higher (mean 10–156 pptv), the dominant emissions originating from the city of Huelva and associated petrochemical activities, located 25 km north west of the measurement site. In wintertime the monoterpene (?)-α-pinene was found to be in slight enantiomeric excess over (+)-α-pinene at night but by day the measured ratio was closer to one i.e. racemic. Samples taken the following summer in the same location showed much higher monoterpene mixing ratios and revealed a strong enantiomeric excess of (?)-α-pinene. This indicates a strong seasonal variance in the enantiomeric emission ratio which is not manifested in the day/night temperature cycles in wintertime. Mixing ratios of the xylene isomers (meta- and para-) and ethylbenzene, which are all well resolved on the beta-cyclodextrin column, were exploited to estimate average OH radical exposures to VOCs from the Huelva industrial area. These were compared to empirical estimates of OH based on JNO₂ measured at the site. The deficiencies of each estimation method are discussed.  相似文献   

Hepatic biotransformation genes and enzymes and PAH metabolites in bile of common sole (Solea solea, Linnaeus, 1758) from an oil-contaminated site in the Mediterranean Sea: a field study     

Trisciani A  Corsi I  Torre CD  Perra G  Focardi S 《Marine pollution bulletin》2011,62(4):806-814

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Geomorphological response of fluvial and coastal terraces to Quaternary tectonics and climate as revealed by geostatistical topographic analysis     

F. Troiani  M. Della Seta 《地球表面变化过程与地形》2011,36(9):1193-1208

Geostatistical topographic analysis is widely recognized as a useful tool for the statistical reconstruction of planar geomorphic markers from relict surfaces. This work is aimed at improving the geostatistical approach used in previous works and developing a method for evaluating the incision rates of rivers in their lower catchments during the Late Quaternary. We chose the major valleys of the Adriatic foothills (central Italy), affected since Late Miocene by a differential tectonic uplift which is still active. In particular, (i) we applied the geostatistical analysis to reconstruct the original top‐surfaces of fluvial‐to‐coastal terrace bodies at the Metauro River and Cesano River mouths; (ii) we performed correlations between the height distribution of the alluvial terrace sequences and the Quaternary climatic curve to estimate the average long‐term fluvial incision rates in the lowermost reaches of the Metauro, Cesano, Misa and Esino Rivers. The obtained averaged incision rates have been interpreted also in the light of the Stream‐Length Gradient Index (SL Index), Steepness Index (K_s), and Concavity Index (θ) as proxies of the stream‐power per unit length. Results confirm that geostatistical and terrain analysis of topographic and geometric arrangements of fluvial and coastal terraces is an effective tool in detecting geomorphic and tectonic factors inducing perturbations on planar geomorphic markers. In particular, we better delineated the surface geometry and boundaries of well‐developed coastal fans at the mouths of the Metauro and Cesano Rivers, already recognized in previous works through sedimentological, morphostratigraphic, and chronological data. Moreover, we found evidence for cut‐and‐fill phases that took place during and immediately after the river aggradation of the late Quaternary glacial periods. Despite the Slope–Area analysis evidenced a widespread influence of the regional differential uplift on single river basin configuration, we observed some space and time variability of averaged incision rates for adjacent valleys, mainly explained by physiographic configuration and dynamics of drainage network. Copyright © 2011 John Wiley & Sons, Ltd.  相似文献