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Search Results: 1 - 10 of 219319 matches for " C. Rendina "
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First outcomes from the CNR-ISAC monthly forecasting system
D. Mastrangelo, P. Malguzzi, C. Rendina, O. Drofa,A. Buzzi
Advances in Science and Research (ASR) , 2012, DOI: 10.5194/asr-8-77-2012
Abstract: A monthly probabilistic forecasting system is experimentally operated at the ISAC institute of the National Council of Research of Italy. The forecasting system is based on GLOBO, an atmospheric general circulation model developed at the same institute. The model is presently run on a monthly basis to produce an ensemble of 32 forecasts initialized with GFS-NCEP perturbed analyses. Reforecasts, initialized with ECMWF ERA-Interim reanalyses of the 1989–2009 period, are also produced to determine modelled climatology of the month to forecast. The modelled monthly climatology is then used to calibrate the ensemble forecast of daily precipitation, geopotential height and temperature on standard pressure levels. In this work, we present the forecasting system and a preliminary evaluation of the model systematic and forecast errors in terms of non-probabilistic scores of the 500-hPa geopotential height. Results show that the proposed forecasting system outperforms the climatology in the first two weeks of integrations. The adopted calibration based on weighted bias correction is found to reduce the systematic and the forecast errors.
Ovary response and embryonic mortality in buffaloes treated with GnRH or hCG
G. Campanile,D. Vecchio,M. Rendina,C. Grassi
Italian Journal of Animal Science , 2010, DOI: 10.4081/ijas.2007.s2.673
Abstract: The aim of the present study was to examine whether treatment with a GnRH agonist or hCG in pregnant buffaloes on Day 25 after AI induce ovulation and increased P4 concentrations. The trial was carried out on 98 pluriparous buffaloes (DIM = 163 ± 75 days) diagnosed pregnant by ultrasound on day 25 after AI, and randomly assigned in two treatment groups GnRH (12 μg of Buserelin Acetate i.m) and hCG (1500 I.U. i.m.) after measurements of follicular diameter and evaluated ovulation. Milk samples were collected on Days 30 and 45 after AI, to assess P4 concentrations in whey. Differences between the follicular diameters of ovulation and P4 were tested by ANOVA. The incidences of animals which responded to the two treatments were analysed by Chi square test. The treatments on day 25 after AI induced ovulation respectively in 68.6% (GnRH) and 57.4% (hCG) of the buffaloes. No differences were found between diameter of follicle ovulated. Ovulation increased milk whey progesterone levels and reduced embryonic mortality in buffalo cows.
Laser Micromachining of Coated YBa2Cu3O6+x Superconducting Thin Films
Kenneth E. Hix,Matthew C. Rendina,James L. Blackshire,George A. Levin
Physics , 2004,
Abstract: Over the last decade advances in high temperature superconducting (HTS) materials have generated a renewed optimism in the use of this technology in future high-power applications including motors, generators, and power transmission. The most promising superconducting material, YBa2Cu3O6+x (YBCO), has demonstrated current density capacity as high as 106 A/cm2 and is typically deposited epitaxially as a thin film on a buffered metallic substrate. The coated conductor architecture Ag/YBCO/Buffer/Ni-based substrate, as does other heteromaterials, introduces unique challenges to the laser micromachining process. In the present study, optimization of the laser micromachining process for machining grooves extending through the YBCO into the buffer layer is considered. A frequency tripled diode-pumped solid-state Nd:YVO4 laser at 355 nm is used in conjunction with both fixed and scanning optical systems. The dependence of cut quality, dimension, and local damage to the YBCO layer on the laser processing parameters including focal spot size, pulse overlap, and fluence will be discussed. Preliminary experimental results indicate that laser micromachining may be used as a reliable process for patterning of superconducting tapes.
Mythe de l’ancien et perception du moderne chez Machiavel
Emanuele Cutinelli Rendina
Astérion , 2005,
Abstract: L’auteur de cet article propose une relecture inédite d’une vieille question machiavélienne, le rapport entre le modèle antique romain et les temps modernes corrompus, qu’il revisite à la lumière d’un troisième terme : le jugement de Machiavel sur la religion chrétienne. Emanuele Cutinelli Rendina développe ici l’hypothèse d’une césure dans la pensée de Machiavel, représentée par le début du deuxième livre des Discours sur la première Décade de Tite-Live. à partir des premiers chapitre du livre II, le modèle romain ne semble plus être actualisable : inconciliable avec un présent trop corrompu, l’idéal va devenir un mythe.
Near-Infrared All-Silicon Photodetectors
M. Casalino,G. Coppola,M. Iodice,I. Rendina,L. Sirleto
International Journal of Photoenergy , 2012, DOI: 10.1155/2012/139278
Abstract: We report the fabrication and characterization of all-silicon photodetectors at 1550 nm based on the internal photoemission effect. We investigated two types of structures: bulk and integrated devices. The former are constituted by a Fabry-Perot microcavity incorporating a Schottky diode, and their performance in terms of responsivity, free spectral range, and finesse was experimentally calculated in order to prove an enhancement in responsivity due to the cavity effect. Results show a responsivity peak of about 0.01 mA/W at 1550 nm with a reverse bias of 100 mV. The latter are constituted by a Schottky junction placed transversally to the optical field confined into the waveguide. Preliminary results show a responsivity of about 0.1 mA/W at 1550 nm with a reverse bias of 1 V and an efficient behaviour in both C and L bands. Finally, an estimation of bandwidth for GHz range is deduced for both devices. The technological steps utilized to fabricate the devices allow an efficiently monolithic integration with complementary metal-oxide semiconductor (CMOS) compatible structures.
Numerical Optimization of a Microfluidic Assisted Microarray for the Detection of Biochemical Interactions
Emanuele Orabona,Ilaria Rea,Ivo Rendina,Luca De Stefano
Sensors , 2011, DOI: 10.3390/s111009658
Abstract: Finite element method analysis was applied to the characterization of the biomolecular interactions taking place in a microfluidic assisted microarray. Numerical simulations have been used for the optimization of geometrical and physical parameters of the sensing device. Different configurations have been analyzed and general considerations have been derived. We have shown that a parallel disposition of the sensing area allows the homogeneous formation of the target molecular complex in all the active zones of the microarray. Stationary and time dependent results have also been obtained.
Near-Infrared Sub-Bandgap All-Silicon Photodetectors: State of the Art and Perspectives
Maurizio Casalino,Giuseppe Coppola,Mario Iodice,Ivo Rendina,Luigi Sirleto
Sensors , 2010, DOI: 10.3390/s101210571
Abstract: Due to recent breakthroughs, silicon photonics is now the most active discipline within the field of integrated optics and, at the same time, a present reality with commercial products available on the market. Silicon photodiodes are excellent detectors at visible wavelengths, but the development of high-performance photodetectors on silicon CMOS platforms at wavelengths of interest for telecommunications has remained an imperative but unaccomplished task so far. In recent years, however, a number of near-infrared all-silicon photodetectors have been proposed and demonstrated for optical interconnect and power-monitoring applications. In this paper, a review of the state of the art is presented. Devices based on mid-bandgap absorption, surface-state absorption, internal photoemission absorption and two-photon absorption are reported, their working principles elucidated and their performance discussed and compared.
[1,2-Bis(diphenylphosphino)-1,2-dicarba-closo-dodecaborane-κ2P,P′][7,8-bis(diphenylphosphino)-7,8-dicarba-nido-undecaborato-κ2P,P′]gold(I)–dichloromethane–water (2/1/1)
Joseph A. Ioppolo,Jack K. Clegg,Louis M. Rendina
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809014937
Abstract: The title compound, [Au(C26H30B10P2)(C26H30B9P2)]·0.5CH2Cl2·0.5H2O, contains two independent complex molecules in the asymmetric unit. The gold(I) centres display a distorted tetrahedral geometry. The complex is stablized through weak intramolecular π–π stacking (Cg...Cg = 4.17 ) and edge-to-face interactions (H...Cg = 3.21 ). Adjacent molecules interact through C—H...π (H...Cg = 2.88 ) and B—H...π (H...Cg = 3.15 ) contacts, forming a three-dimensional network, with solvent molecules occupying the cavities. One of the phenyl groups was disordered over two sites with occupancy factors of 0.65 and 0.35.
Geochemical distribution and mobility factors of Zn and Cu in sediments of the Reconquista River, Agentina
Alicia Rendina,Laura de Cabo,Silvana Arreghini,Martha Bargiela
Revista internacional de contaminación ambiental , 2001,
Abstract: Este trabajo describe la distribución del Cu y del Zn entre las fases geoquímicas de los sedimentos superficiales del cauce del Río Reconquista y sus principales arroyos tributarios (La Choza y Durazno). Los patrones de distribución de ambos metales entre las fases geoquímicas no residuales, obtenidas con un procedimiento de extracción secuencial, no sufrieron alteraciones en ninguno de los ambientes geoquímicos de los siete sitios de muestreo. La principal fase móvil de retención de Cu fue la materia orgánica-sulfuros, mientras que para el Zn fueron los óxidos de Fe y Mn. Los factores de movilidad del Cu y del Zn permiten distinguir áreas de alto y bajo impacto antropogénico. El factor de movilidad del Zn fue cercano a uno en la cuenca alta, a excepción del arroyo La Choza, presentando valores muy altos en el cauce principal del río. El factor de movilidad del Cu fue alto en las cuencas media y baja, mientras que la alta presentó contenidos bajos de Cu móvil. La disminución tanto en los factores de movilidad como en las concentraciones totales de ambos metales en la desembocadura del río, pusieron en evidencia el poder de autodepuración de este curso de agua.
Influence of a swimming-pool on fertility in buffalo species
Gianluca Neglia,Marco Rendina,Anna Balestrieri,Filippo Lo Grasso
Italian Journal of Animal Science , 2010, DOI: 10.4081/ijas.2009.s2.637
Abstract: The aim of this study was to verify the effect of a swimming-pool on reproductive efficiency in buffalo species. The trial was performed in a commercial buffalo farm, where lactating buffaloes were divided into two groups (G1 and G2), and only in G1 a swimming-pool was available. Data of a 4-years period (1999–2002) were analysed. Statistical analysis of calving-conception interval (CCI) of a first 3-years period (1999–2001), after logarithmic conversion, was performed by “t” Student’s Test while the percentage data were analyzed by Chi-square test. Animals in G1 showed higher conception rate within 120 days post calving (53.7% vs. 39.9%; P<0.001) in both deliveries of January-March and April-August. During the first 2 years (1999–2000) the CCI of buffaloes that delivered in January- March period was longer (P<0.001) than that of April-August. Furthermore, on the total of the 3 years the CCI was longer (P<0.01) in buffaloes of G2 compared to G1. Because of the presence of a swimming- pool also for G2 from 2002 May, the conception rate of not pregnant subjects characterized by more than 40 days open in 2001 and 2002 was also calculated and the favourable effect was confirmed. These results highlight the beneficial effect of a swimming-pool on fertility in buffalo species.
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