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Search Results: 1 - 10 of 223885 matches for " R. Perrino "
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Eastern Oyster (Crassostrea virginica) Filtration Efficiency of Chlorophyll-a under Dynamic Conditions in the Hudson-Raritan Estuary at Pier 40, New York City  [PDF]
Jane E. Perrino, Dennis R. Ruez Jr.
Open Journal of Ecology (OJE) , 2019, DOI: 10.4236/oje.2019.97019
Abstract: Eastern oyster (Crassostrea virginica) abundance has declined severely over the past century along the Atlantic and Gulf coasts of the United States. For varied reasons, overfishing among the foremost, bivalves no longer make up considerable reefs as was common. While discourse continues on oyster restoration and augmentation, gaps in knowledge of C. virginica and regional environmental interactions remain. Our primary aim was to examine the C. virginica filter feeding of phytoplankton in the Hudson River Estuary, New York City. Secondarily, this study examined the filtration of these oysters in relation to environmental attributes. Chlorophyll-a, the predominant photosynthesizing pigment in red and green algae, is an indicator of phytoplankton productivity in aquatic settings. Crassostrea virginica consumes first-tier plankton from the water column’s seston; thus analysis of chlorophyll-a content allows estimating phytoplankton concentrations, from which oyster filtration efficiency (FE) was quantified. Water conditions (temperature, dissolved oxygen, pH, salinity, turbidity, tide and flow rate) also were recorded. Spectrophotometric determination of chlorophyll-a concentration methodology was derived from the Standard Methods text favored by the US EPA. This project compared real-time Hudson River Estuary (HRE) water samples prior to passing through a contained oyster reef and samples of water post-filtration. This sampling scenario was unique as the contained reef used was fed by HRE water. Most studies on oyster filtration have been laboratory-based, and few assessed oysters in the field. This study took place at Pier 40, the River Project Wetlab, lower Hudson River along Manhattan. The FE of this reef was calculated for two months during various environmental states which can be the basis of future investigations. Statistically significant differences were found between pre- and post-filtration water samples (Z = 4.620, p < 0.001). This study provides a glimpse at how the oysters fare in the HRE environment and expands upon known oyster ecological services and environmental interactions.
ATLAS RPC Quality Assurance results at INFN Lecce
M. Bianco,I. Borjanovic,G. Cataldi,A. Cazzato,G. Chiodini,M. R. Coluccia,P. Creti,F. Grancagnolo,R. Perrino,M. Primavera,S. Spagnolo,G. Tassielli,A. Ventura
Physics , 2006,
Abstract: The main results of the quality assurance tests performed on the Resistive Plate Chamber used by the ATLAS experiment at LHC as muon trigger chambers are reported and discussed. Since July 2004, about 270 RPC units has been certified at INFN Lecce site and delivered to CERN, for being integrated in the final muon station of the ATLAS barrel region. We show the key RPC characteristics which qualify the performance of this detector technology as muon trigger chamber in the harsh LHC enviroments. These are dark current, chamber efficiency, noise rate, gas volume tomography, and gas leakage.
Determination of Cr(III), Cr(VI) and total chromium in atmospheric aerosol samples
Catrambone M.,Canepari S.,Perrino C.
E3S Web of Conferences , 2013, DOI: 10.1051/e3sconf/20130107005
Abstract: This study addresses the optimization and validation of an analytical method based on the ultrasound-assisted extraction of soluble Cr from atmospheric particulate matter (PM) and subsequent determination of Cr(III) and Cr(VI) by catalytic adsorptive stripping voltammetry (CAdSV) by using diethylenetriammino pentaacetic acid (DTPA) as complexing agent in the presence of nitrate. We evaluated the influence of various filter materials and of extracting conditions and validated the method on both reference material and real PM10 samples. The accuracy of total extractable Cr determination was checked by parallel ICP-OES measurements. The determination of total chromium was performed by ED-XRF. Results of field campaigns carried out in two industrial areas (North Italy and Tunis) and at a peri-urban site near Rome are reported. At the peri-urban site, the total Cr concentration in PM10 ranged from 2 to 5 ng/m3, with a soluble fraction of 5-13%, and Cr(VI) concentration was always below the detection limits (50 pg/m3). In the industrial area of Northern Italy, total Cr concentration ranged between 6 and 11 ng/m3, the soluble fraction was about 11-28% and detectable amounts of Cr(VI) were found, with a Cr(VI)/Cr(III) ratio ranging from 0.5 to 2.5. A further increase of Cr(VI) concentration was evidenced at the industrial site of Tunis, where the total Cr concentration ranged from 6 to 26 ng/m3, with a soluble fraction accounting for about 8-44% and a Cr(VI)/Cr(III) ranging from 1.6 to 3.6. The results of size-segregated samples, collected in Northen Italy by a 10-stage cascade impactor, indicate a relevant fine fraction of Cr(VI), with Cr(VI)/Cr(III) ratios increasing with the decrease of particle size.
Characterization of trace metals in airborne carbonaceous aerosols by single-particle EDX – Scanning Electron Microscopy
Pietrodangelo A.,Pareti S.,Perrino C.
E3S Web of Conferences , 2013, DOI: 10.1051/e3sconf/20130105002
Abstract: The presence of fine and ultrafine metal particles has been evidenced in size segregated airborne carbonaceous aerosols collected at one industrial and two background (urban and rural) sites during an extended field campaign in Central Italy. Analysis of the backscattered electrons (BSE) by SEM – EDX demonstrated an effective potential in evidencing main structural features of the metal content in identified carbon aerosols. Many observed ultrafine metal particles appear embedded in the skeleton of carbonaceous individual particles and aggregates in the coarse fraction, while the same is not evident in the case of mixed carbon-sulphates aerosol that has been detected in the submicron size. These carbon-sulphates formations include indeed nano-sized metal particles that appear physically combined but not embedded. Also, larger metal particles (ranging around 1 μm physical size) were observed close to carbon materials, but not included in their structure. Main compositional differences of metal particles with size segregation could be evidenced by energy – dispersive X ray spectrometry (EDX). Larger particles are mainly rich in Fe, frequently in presence of Mn, Cu, Cr and Zn in variable proportions; either oxidized or elemental metals were detected. On the other hand, ultrafine particles associated with carbon–sulphates aerosol are enriched in Pb and Zn, although the presence of other trace elements not detectable by SEM – EDX technique cannot be excluded. Moreover, Ce-enriched ultrafine particles were clearly determined in cenospheres. Conversely, inclusion of fine and ultrafine metal particles was rarely or not observed in soot aggregates.
16O(e,e'p) reaction at large missing energy
M. Iodice,E. Cisbani,R. De Leo,S. Frullani,F. Garibaldi,D. L. Groep,W. H. A. Hesselink,E. Jans,L. Lapikas,C. J. G. Onderwater,R. Perrino,J. Ryckebusch,R. Starink,G. M. Urciuoli
Physics , 2007, DOI: 10.1016/j.physletb.2007.08.034
Abstract: We investigate the origin of the strength at large missing energies in electron-induced proton knockout reactions. For that purpose the reaction 16O(e,e'p) was studied at a central value omega=210 MeV of the energy transfer, and two values of the momentum transfer: q=300, 400 MeV/c, corresponding to the "dip region". Differential cross sections were determined in a large range of missing energy (Em=0-140 MeV) and proton emission angle (gamma_pq =0-110 deg), and compared to predictions of a model that includes nucleon-nucleon short-range correlations and two-body currents. It is observed that, in the kinematic domain covered by this experiment, the largest contribution to the cross section stems from two-body currents, while short-range correlations contribute a significant fraction
Drug-Eluting Stent for the Treatment of Early Fistula Failure  [PDF]
Luigi Di Serafino, Laura Scudiero, Mario De Laurentis, Federica Ilardi, Fabio Magliulo, Giuseppe Carotenuto, Cinzia Perrino, Giovanni Esposito
International Journal of Clinical Medicine (IJCM) , 2011, DOI: 10.4236/ijcm.2011.23032
Abstract: Introduction: Morbidity and mortality in chronic haemodialysis patients is related to dialysis efficiency. Several complications may occur with vascular access, usually associated with a stenosis. This is known to occur frequently in the venous outflow. Stenosis of the arterial side is not as frequently discussed, but it is also likely to compromise fistula function. Traditionally, surgical and percutaneous interventions have been used to treat failing fistulas, but the employment of drug-eluting stents for the treatment of failing fistulas due to the arterial stenosis has been described rarely. Methods: A 65-year-old male patient referred to our ambulatory because of hand ischemia during haemodialysis treatments only few days after radial-cephalic fistula creation. After physical and echo-color-doppler examination, angiography was performed and percutaneous intervention was proposed. After the positioning of a guiding catheter, the lesion was crossed with a 0.014” guide wire followed by direct drug-eluting stent implantation. Results: Final angiogram showed a good result and a preserved flow through the fistula. Six months later the patient was asymptomatic and the fistula was still working. Conclusion: Although further prospective studies are necessary, percutaneous transluminal angioplasty (PTA) with drug-eluting stents implantation could be considered a safe and effective technique for the treatment of arteriovenous fistulas stenosis.
Qualitative and quantitative determination of water in airborne particulate matter
S. Canepari, C. Farao, E. Marconi, C. Giovannelli,C. Perrino
Atmospheric Chemistry and Physics (ACP) & Discussions (ACPD) , 2013,
Abstract: This paper describes the optimization and validation of a new simple method for the quantitative determination of water in atmospheric particulate matter (PM). The analyses are performed by using a coulometric Karl-Fisher system equipped with a controlled heating device; different water contributions are separated by the application of an optimized thermal ramp (three heating steps: 50–120 °C, 120–180 °C, 180–250 °C). The analytical performance of the method was verified by using standard materials containing 5.55% and 1% by weight of water. The recovery was greater than 95%; the detection limit was about 20 μg. The method was then applied to NIST Reference Materials (NIST1649a, urban particulate matter) and to real PM10 samples collected in different geographical areas. In all cases the repeatability was satisfactory (10–15%). When analyzing the Reference Material, the separation of four different types of water was obtained. In real PM10 samples the amount of water and its thermal profile differed as a function of the chemical composition of the dust. Mass percentages of 3–4% of water were obtained in most samples, but values up to about 15% were reached in areas where the chemical composition of PM is dominated by secondary inorganic ions and organic matter. High percentages of water were also observed in areas where PM is characterized by the presence of desert dust. A possible identification of the quality of water released from the samples was tried by applying the method to some hygroscopic compounds that are likely contained in PM (pure SiO2, Al2O3, ammonium salts, carbohydrates and dicarboxylic acids) and by comparing the results with those obtained from field samples.
Evaluation of the nanoparticles contribution to elemental concentration in airborne particulate matter
Canepari S.,Marconi E.,Astolfi M. L.,Perrino C.
E3S Web of Conferences , 2013, DOI: 10.1051/e3sconf/20130107004
Abstract: A method for estimating the contribution of nanoparticles (NPs) to the elemental concentration in airborne particulate matter (PM) is described. The results related to size-segregated samples collected at an urban site show that significant concentrations of Sb, Cd, Pb, As, V and Sn are present in the fine fraction of PM as complex structures in which NPs are aggregated or included in other materials. These structures are easily broken in water media by the application of ultrasounds, leading to a stable suspension of insoluble NPs. The contribution of NPs can be evaluated as the difference between the inductively coupled plasma (ICP-MS) analysis before and after the elution of the stable NPs suspension from an ion exchange cartridge.
ATLAS RPC Cosmic Ray Teststand at INFN Lecce
G. Cataldi,G. Chiodini,R. Assiro,P. Creti,G. Fiore,F. Grancagnolo,A. Miccoli,R. Perrino,S. Podkladkin,M. Primavera,A. Ventura,M. Bianco,E. Brambilla,A. Cazzato,C. Chiri,M. R. Coluccia,R. Gerardi,E. Gorini,S. Spagnolo,G. Tassielli
Physics , 2004,
Abstract: We describe the design and functionality of the cosmic ray teststand built at INFN Lecce for ATLAS RPC quality control assurance.
Test of the CLAS12 RICH large scale prototype in the direct proximity focusing configuration
N. Baltzell,L. Barion,F. Benmokhtar,W. Brooks,E. Cisbani,M. Contalbrigo,A. El Alaoui,K. Hafidi,M. Hoek,V. Kubarovsky,L. Lagamba,V. Lucherini,R. Malaguti,M. Mirazita,R. A. Montgomery,A. Movsisyan,P. Musico,A. Orlandi,D. Orecchini,L. L. Pappalardo,R. Perrino,J. Phillips,S. Pisano,P. Rossi,S. Squerzanti,S. Tomassini,M. Turisini,A. Viticchie
Physics , 2015,
Abstract: A large area ring-imaging Cherenkov detector has been designed to provide clean hadron identification capability in the momentum range from 3 GeV/c up to 8 GeV/c for the CLAS12 experiments at the upgraded 12 GeV continuous electron beam accelerator facility of Jefferson Laboratory. The adopted solution foresees a novel hybrid optics design based on aerogel radiator, composite mirrors and high-packed and high-segmented photon detectors. Cherenkov light will either be imaged directly (forward tracks) or after two mirror reflections (large angle tracks). We report here the results of the tests of a large scale prototype of the RICH detector performed with the hadron beam of the CERN T9 experimental hall for the direct detection configuration. The tests demonstrated that the proposed design provides the required pion-to-kaon rejection factor of 1:500 in the whole momentum range.
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