oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 184 )

2018 ( 278 )

2017 ( 279 )

2016 ( 379 )

Custom range...

Search Results: 1 - 10 of 219809 matches for " C. Carraro "
All listed articles are free for downloading (OA Articles)
Page 1 /219809
Display every page Item
Erratum: Star formation and chemical evolution in SPH simulations: a statistical approach
C. Lia,L. Portinari,G. Carraro
Physics , 2002, DOI: 10.1046/j.1365-8711.2002.05798.x
Abstract: Errata for MNRAS 330, 821 (2002, astro-ph/0111084). A notation error in Eq. 7 and some typos in Table 3 corrected.
On the peculiar red clump morphology in the open clusters NGC 752 and NGC 7789
L. Girardi,J. -C. Mermilliod,G. Carraro
Physics , 2000,
Abstract: The red clump stars in the open cluster NGC 752 present a peculiar distribution in the colour-magnitude diagran (CMD): the clump is observed to present a faint extension, slightly to the blue of the main concentration of clump stars. We point out that a similar structure is present in the CMD of NGC 7789, and discuss their possible origins. This feature may be understood as the result of having, at the same time, stars of low-mass which undergo the helium-flash, and those just massive enough for avoiding it. The ages of both clusters are compatible with this interpretation. Similar features can be produced in theoretical models which assume a non-negligible mass spread for clump stars, of about 0.2 Mo. However, one can probably exclude that the observed effect is due to the natural mass range of core helium burning stars found in single isochrones, although present models do not present the level of detail necessary to completely explore this possibility. Also the possibility of a large age spread among cluster stars can be refuted on observational grounds. We then suggest a few alternatives. This spread may be resulting either from star-to-star variations in the mass-loss rates during the RGB phase. Alternatively, effects sush as stellar rotation or convective core overshooting, could be causing a significant spread in the core mass at He-ignition for star of similar mass. Finally, we point out that similar effects could also help to understand the distribution of clump stars in the CMDs of the clusters NGC 2660 and NGC 2204.
Coupling Chemical Evolution with SPH
G. Carraro,L. Portinari,C. Lia
Physics , 2001,
Abstract: We present a new statistical algorithm of Chemical Evolution implemented into the Tree-SPH code developed by Lia & Carraro (2000 MNRAS 314, 145).
On the mutual effect of ion temperature gradient instabilities and impurity peaking in the reversed field pinch
I. Predebon,L. Carraro,C. Angioni
Physics , 2011, DOI: 10.1088/0741-3335/53/12/125009
Abstract: The presence of impurities is considered in gyrokinetic calculations of ion temperature gradient (ITG) instabilities and turbulence in the reversed field pinch device RFX-mod. This device usually exhibits hollow Carbon/Oxygen profiles, peaked in the outer core region. We describe the role of the impurities in ITG mode destabilization, and analyze whether ITG turbulence is compatible with their experimental gradients.
Star formation and chemical evolution in SPH simulations: a statistical approach
C. Lia,L. Portinari,G. Carraro
Physics , 2001, DOI: 10.1046/j.1365-8711.2002.05118.x
Abstract: In Smoothed Particles Hydrodynamics (SPH) codes with a large number of particles, star formation as well as gas and metal restitution from dying stars can be treated statistically. This approach allows to include detailed chemical evolution and gas re-ejection with minor computational effort. Here we report on a new statistical algorithm for star formation and chemical evolution, especially conceived for SPH simulations with large numbers of particles, and for parallel SPH codes. For the sake of illustration, we present also two astrophysical simulations obtained with this algorithm, implemented into the Tree-SPH code by Lia & Carraro (2000). In the first one, we follow the formation of an individual disc-like galaxy, predict the final structure and metallicity evolution, and test resolution effects. In the second one we simulate the formation and evolution of a cluster of galaxies, to demonstrate the capabilities of the algorithm in investigating the chemo-dynamical evolution of galaxies and of the intergalactic medium in a cosmological context.
Dwarf Elliptical Galaxies: Structure, Star Formation, and Color-Magnitude Diagrams
G. Carraro,C. Chiosi,L. Girardi,C. Lia
Physics , 2001, DOI: 10.1046/j.1365-8711.2001.04633.x
Abstract: The aim of this paper is to cast light on the formation and evolution of elliptical galaxies by means of N-body/hydro-dynamical simulations that include star formation, feed-back and chemical evolution. Particular attention is paid to the case of dwarf spheroidals of the Local Group which, thanks to their proximity and modern ground-based and space instrumentation, can be resolved into single stars so that independent determinations of their age and star formation history can be derived. Dwarf galaxies are known to exhibit complicated histories of star formation ranging from a single very old episode to a series of bursts over most of the Hubble time. We start from virialized haloes of dark matter, and follow the infall of gas into the potential wells and the formation of stars. We find that in objects of the same total mass, different star formation histories are possible, if the collapse phase started at different initial densities. We predict the final structure of dwarf spheroidal galaxies, their kinematics, their large scale distribution of gas and stars, and their detailed histories of the star formation and metal enrichment. Using a population synthesis technique, star formation and metal enrichment rates are then adopted to generate the present color-magnitude diagrams of the stellar populations hosted by dwarf spheroidal galaxies. varying the cosmological parameters $H_0$ and $q_0$. compared with the observational ones for some dwarf spheroidals of the Local Group.
Distribui??o dos fitatos em farelo de arroz estabilizado e tratado com fitase exógena
CúNEO, Florencia;Amaya-FARFAN, J.;CARRARO, Francisco;
Ciência e Tecnologia de Alimentos , 2000, DOI: 10.1590/S0101-20612000000100018
Abstract: hydrolysis of phytic acid with purified exogenous phytase was attempted and the evolution of the m-inositol polyphosphate pattern followed by hplc. after 24h of hydrolysis, reduction of total phytates by this process amounted to 37%, the hexaphosphate (ip6) continued to be the predominant fraction (81%), whereas the ip4 and ip3 components remained negligible (0.3 and 0.5%, respectively). we conclude that the minor variations observed in the distribution profile are indicative of a serial-type enzyme mechanism, while the inefficient action of exogenous phytase on the stabilized rice bran is confirmed.
Seasonal abundance of Chrysomya megacephala and C. albiceps (Diptera: Calliphoridae) in urban areas
EVALDO M,PIRES; CARRARO,VINíCIUS M; ZANUNCIO,JOSé C;
Revista Colombiana de Entomología , 2008,
Abstract: a faunistic analysis of sinantropic calliphorids, chrysomya megacephala and c. albiceps, was carried out in the urban area of volta redonda city, rio de janeiro, brazil from october 2000 to september 2001. two traps baited with fresh sardine were used. a total of 4,101 specimens of the genus chrysomya were collected. the highest abundance of adults occurred between december 2000 and january 2001. chrysomya megacephala was the most abundant species (57.71%) reaching its highest number in december 2000, followed by c. albiceps (41.94%) with a population peak in january 2001. chrysomya putoria was also present in some traps but only 14 individuals were collected. correlations between the presence of these species and the weather variables indicated that the presence of c. megacephala was influenced by rainfall and temperature, while c. albiceps was only affected by rainfall.
Seasonal abundance of Chrysomya megacephala and C. albiceps (Diptera: Calliphoridae) in urban areas Abundancia estacional de Chrysomya megacephala y C. albiceps (Diptera: Calliphoridae) en área urbana
PIRES EVALDO M,VINíCIUS M CARRARO,JOSé C ZANUNCIO
Revista Colombiana de Entomología , 2008,
Abstract: A faunistic analysis of sinantropic calliphorids, Chrysomya megacephala and C. albiceps, was carried out in the urban area of Volta Redonda city, Rio de Janeiro, Brazil from October 2000 to September 2001. Two traps baited with fresh sardine were used. A total of 4,101 specimens of the genus Chrysomya were collected. The highest abundance of adults occurred between December 2000 and January 2001. Chrysomya megacephala was the most abundant species (57.71%) reaching its highest number in December 2000, followed by C. albiceps (41.94%) with a population peak in January 2001. Chrysomya putoria was also present in some traps but only 14 individuals were collected. Correlations between the presence of these species and the weather variables indicated that the presence of C. megacephala was influenced by rainfall and temperature, while C. albiceps was only affected by rainfall. Un análisis faunístico de las especies de califóridos sinantrópicos, Chrysomya megacephala y C. albiceps se realizó en el área urbana de la ciudad de Volta Redonda, Rio de Janeiro, Brasil desde octubre de 2000 hasta septiembre de 2001. Se utilizaron dos trampas cebadas con sardina fresca. Un total de 4.101 individuos del género Chrysomya fueron recolectados. La mayor abundancia de los adultos se registró entre diciembre de 2000 y enero de 2001. Chrysomya megacephala fue la especie más abundante (57,71%) alcanzando el valor más alto en diciembre 2000 seguida por C. albiceps (41,94%) con un pico poblacional en enero de 2001. Chrysomya putoria también estuvo presente en algunas trampas pero solamente 14 individuos fueron recolectados. Correlaciones entre la presencia de las especies y las variables climáticas indicaron que la presencia de C. megacephala está influida por la precipitación y la temperatura, mientras que C. albiceps está solamente afectada por la precipitación.
Effect of pre-slaughter conditions in European sea bass (Dicentrarchus labrax)
A. Trocino,G. Xiccato,L. Carraro,C. Simontacchi
Italian Journal of Animal Science , 2010, DOI: 10.4081/ijas.2005.2s.606
Abstract: The increasing attention towards animal welfare also concerns aquaculture species, with special regards to husbandry and slaughter conditions. Both the extent and the duration of stressful events especially before slaughter may affect post-mortem evolution of biochemical processes and product shelf-life (Pottinger, 2001; Zampacavallo et al., 2003). The present work aimed to evaluate the effects of preslaughter conditions in European sea bass according to i) stocking density and ii) time spent in confinement tanks after catch and before slaughter on physiological indicators of stress and meat quality during storage.
Page 1 /219809
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.