206 research outputs found
Aspects of Land Take in the Metropolitan Area of Naples
Land take is a phenomenon of great concern
nowadays because of the large number of its negative
impacts regarding biological, economic and social
balance. In Italy, the development of urban and other
artificial land has been irreversibly transforming a nonrenewable
resource such as soil, regardless the almost
constant population rate, with different speed
depending of the region considered. The aim of this
paper is to analyze the phenomenon in the
metropolitan area of Naples, which is an area highly
affected by territorial aggression of human matrix. The
data used are both by the Institute for Environmental
Protection and Research (ISPRA) Report 2015 on the
usage of the land and by ISTAT relating to the
resident population up to the 1st of January 2015 and
the extension of land for agricultural use (Census
2010). The mathematical combination of this data
creates a new indicator that can be referred to as
âresidual landâ; this residual area is of great extension
with many different characteristics and it could
represent the area where the phenomenon of land
take most occurs. The identification, measurement and
analysis of âresidual landâ provide new insights on the
evolution of land take and this new indicator can
represent a critical element to work on to prevent
future land transformation and protect natural and
agricultural areas within the Italian context
Opers versus nonabelian Hodge
For a complex simple simply connected Lie group , and a compact Riemann
surface , we consider two sorts of families of flat -connections over
. Each family is determined by a point of the base of
Hitchin's integrable system for . One family consists of -opers, and depends on . The
other family is built from solutions of
Hitchin's equations, and depends on . We show that in the scaling limit , ,
we have . This
establishes and generalizes a conjecture formulated by Gaiotto.Comment: 23 page
Traffic pollution modelling in a complex urban street
This study explores for the first time, the applicability of the Danish Operational Street Pollution Model (OSPM) in the city of Buenos Aires where street canyons are very irregular. The model is applied in an irregular and asymmetric street canyon of a five-lane avenue near a street intersection. Urban background concentrations estimated by the DAUMOD model are considered. Meteorological information registered at the domestic airport located in the city is used in calculations. Three months of hourly NOx, NO 2 and CO estimated concentrations are compared with measurements inside the street canyon. Statistical evaluation of model results shows that OSPM performance is quite good.Fil: Venegas, Laura Esperanza. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas; Argentina. Universidad TecnolĂłgica Nacional; ArgentinaFil: Mazzeo, Nicolas Antonio. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas; Argentina. Universidad TecnolĂłgica Nacional; Argentin
Study of natural and traffic-producing turbulences analysing full-scale data from four street canyons
Parameters related with natural and traffic producing turbulences are estimated for four street canyons considering all wind directions. Available data include air pollution concentrations measured in Göttinger Strasse (Hannover, Germany), Schildhornstrasse (Berlin, Germany), Jagtvej (Copenhagen, Denmark) and Hornsgatan (Stockholm, Sweden), background pollution, wind speed and direction measured on the roof of a nearby building and information of traffic flow. Results show that coefficients a and b, related to natural- and traffic- produced turbulences, vary with wind direction. The variation of critical wind speed with traffic density and wind direction is also studied for each street canyon.Fil: Mazzeo, Nicolas Antonio. Universidad TecnolĂłgica Nacional. Facultad Regional Avellaneda; Argentina. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas; ArgentinaFil: Venegas, Laura Esperanza. Universidad TecnolĂłgica Nacional. Facultad Regional Avellaneda; Argentina. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas; Argentin
Hourly NOXconcentrations and wind direction in the vicinity of a street intersection
This study relates NOxconcentrations and wind (speed and direction) measured inside an asymmetric street canyon, with ambient wind. The monitoring site is located near a street intersection. The wind measured at the domestic airport located in the city, near the coast, has been considered as ambient wind. Wind direction at the monitoring site inside the canyon is mainly from the E, NE, W and NW for any ambient direction. In general, the behaviour of horizontal airflow at the monitoring site for different ambient wind directions seems to be quite similar to those observed at other street intersections reported in the literature.Fil: Mazzeo, Nicolas Antonio. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas; Argentina. Universidad TecnolĂłgica Nacional; ArgentinaFil: Venegas, Laura Esperanza. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas; Argentina. Universidad TecnolĂłgica Nacional; Argentin
EVALUATION OF NATURAL AND TRAFFIC-PRODUCING TURBULENCES USING FULL SCALE DATA FROM FOUR STREET CANYONS
In urban areas, high air pollutant concentrations may be observed, mostly within street canyons, where buildings and
other obstacles disturb the airflow and turbulence. Air motions inside the street canyons are influenced by aerodynamic and thermal
effects and by the movements of the vehicles. Parameters related with natural and traffic produced turbulences are estimated for four
street canyons considering all wind directions. Available data used include air pollution concentrations measured in Göttinger
Strasse (Hannover, Germany), Schildhornstrasse (Berlin, Germany), Jagtvej (Copenhagen, Denmark) and Hornsgatan (Stockholm,
Sweden), and background pollution, wind speed and direction measured on the roof of a nearby building and information of traffic
flow. For each street canyon, the variation with traffic density of critical wind speed (that equals the contributions of turbulent
motions related to wind and traffic to the effective velocity variance inside the street canyon) is also studied
Air pollution in a street canyon estimated considering different parameterisations of vehicle-induced turbulence
Leeward air pollutant concentrations (C) are estimated by incorporating four parameterisations of traffic-produced turbulence (TPT) into the scaling of C inside a street canyon. Three parameterisations consider expressions previously introduced by other authors, based on a theoretical formulation of TPT and a semi-empirical approach already incorporated in an operational street model. The fourth scheme introduces an empirical expression of TPT derived from four full-scale street canyon datasets. Hourly NOx concentrations are calculated for an asymmetric street canyon in Buenos Aires, using meteorological observations at local airport and modelled background concentrations. Statistical indicators show that the performance of the four schemes is satisfactory.Fil: Mazzeo, Nicolas Antonio. Universidad TecnolĂłgica Nacional. Facultad Regional Avellaneda. Departamento de IngenierĂa QuĂmica; Argentina. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas; ArgentinaFil: Venegas, Laura Esperanza. Universidad TecnolĂłgica Nacional. Facultad Regional Avellaneda. Departamento de IngenierĂa QuĂmica; Argentina. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas; ArgentinaFil: Dezzutti, Mariana Clara. Universidad TecnolĂłgica Nacional. Facultad Regional Avellaneda. Departamento de IngenierĂa QuĂmica; Argentina. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas; Argentin
Controlling non-radiative energy transfer in organic binary blends: a route towards colour tunability and white emission from single-active-layer light-emitting devices
We show how colour tunability (including white) can be achieved by controlling non-radiative intermolecular energy transfer from the donor to the acceptor in binary blends of oligomeric compounds. Blends of different concentrations of a novel functionalized thiophene-based oligomer and a low-molar-mass diamine derivative (N, N'-diphenyl-N, N'-bis(3-methylphenyl)-1, 1'-biphenyl-4.4'diamine) are used to tune both the photoluminescence and the electroluminescence (EL) from red to blue, including balanced white, according to the standards of the Commission Internationale de l'Eclairage. The single-active-layer light-emitting devices, realized by spin-coating, exhibit good EL performance. In particular, the white-emitting device shows an EL efficiency of 5 Ă 10â1âcdâAâ1 and a luminance of more than 180âcdâmâ2
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