1,721,029 research outputs found
Dry deposition of particle on urban areas
Full text linkDry deposition process is recognized as an important pathway among the removal processes of radioactive pollutants in atmosphere. There is not a unique and accepted theoretical description of involved dry deposition phenomena due to the complexity of the fluid-dynamic processes that influence the deposition flux, but also because there is a lack of experimental data covering all scenarios of interest. In this paper, that is the result of a National Research Program a research activity conducted by DEIM Department of the University of Palermo and ENEA and funded by the Italian Minister of Economic Development, a new schema for parameterization of particle dry deposition velocity on urban area is proposed. The work required comparisons with some experimental data reported in literature for different particle deposition scenarios. The results show that the proposed approach can catch some aspects of phenomena involved in dry deposition processes for the examined environmental conditions with good agreement
Contribution to the study of egg development and derivation in Oscarella lobularis (Porifera, Demospongiae). '
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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
Analisi dei modelli validi per lo studio dei processi di deposizione secca e sui dati meteo previsionali dell’ECMWF
Full text linkThe DEIM's research group in collaboration with ENEA –C.R. Bologna, has performed the
following activities: "Analysis of models to study dry deposition processes of pollutants in atmosphere onto urban surface", and "Preliminary study of compatibility between ECMWF forecast data and CALMET model". Regarding the first activity, a dry deposition model, based on electrical analogy, is developed to analyze complex phenomena,such as inertial impact processes and wind turbulence effects,
that influence the transport of pollutants in the interface between urban canopy and quasi-laminar sublayer.
The model allows the deposition rate assessment for particles with different diameters and
various atmospheric conditions. A validation activity is performed by using some experimental
data reported in literature for several Italian cities.
With regard the second activity, the work is aimed to verify the compatibility of ECMWF
forecast data with CALMET.
This is a necessary step to build the CALMET data set input. Some empirical correlations as
reported in literature as been identified to this purpose.
It is to be noted that the ECMWF does not provide land use data and average cells height,
required for CALMET modeling. Such data can be obtained through some pre-processors
included in the CALMET software packag
Origin of male gametes from choanocytes in Spongia officinalis (Porifera, Demospongiae).
No full textCytoskeleton and morphology of dissociated sponge cells. A whole-mount and scanning electron microscopic study
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