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Search Results: 1 - 10 of 189829 matches for " G. Casano "
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Air-Water Cooling System for Switch-Mode Power Supplies  [PDF]
G. Casano, S. Piva
Journal of Electronics Cooling and Thermal Control (JECTC) , 2015, DOI: 10.4236/jectc.2015.53005
Abstract: The results are presented of an experimental investigation of heat transfer in an air-liquid cooling system for a Switch-Mode Power Supply (SMPS) for TV digital power amplifiers. Since these SMPSs are characterized by high power and high compactness, thereby making the standard cooling techniques difficult to be used, a new cooling system is developed, using water and air as the cooling media. The active components (MOSFETs) are cooled with a liquid cold-plate, the passive ones (condensers, transformers, coils) with an air flow, in turn cooled by the cold-plate. By inserting the cooling system in an experimental tool where it is possible to control the cooling water, measurements are made of temperature in the significant points of the SMPS. The electric efficiency is also measured. The evaluation of the thermal performance of this cooling system is useful in order to limit its maximum operational temperature. The efficacy of the cooling system is demonstrated; the trends of efficiency and power dissipation are evidenced.
Experimental Investigation of the Fluid Dynamics of a Finned Heat Sink under Operating Conditions  [PDF]
G. Casano, M. W. Collins, S. Piva
Journal of Electronics Cooling and Thermal Control (JECTC) , 2014, DOI: 10.4236/jectc.2014.43010
Abstract: An experimental study has been made of the fluid dynamics performance of electronic equipment designed to cool a heat sink in the form of a finned duct. The apparatus consists of a channel of rectangular section containing the finned duct. A forced airflow is driven by three fans placed in parallel in the inlet and in the outlet sections of the channel. In order to investigate a full range of flow rates, different sets of fans were used in the inlet section. Measurements were made of static pressures at different channel positions by pressure taps connected to a micro manometer, and of the flow rate by a Venturi meter. The experimental working conditions of the active fans were consistent with the manufacturers’ characteristic curves. Values of the local friction coefficient compared well with published correlations. The experimental working points agreed very well with the theoretical curve of the pressure drop and the hydraulic diameter was demonstrated to be of the appropriate size for this fluid dynamics problem.
The GRAAL high resolution BGO calorimeter and its energy calibration and monitoring system
F. Ghio,B. Girolami,M. Capogni,L. Casano,L. Ciciani,A. D'Angelo,R. Di Salvo,L. Hu,D. Moricciani,L. Nicoletti,G. Nobili,C. Schaerf,P. Levi Sandri,M. Castoldi,A. Zucchiatti,V. Bellini
Physics , 1997, DOI: 10.1016/S0168-9002(97)01124-8
Abstract: We describe the electromagnetic calorimeter built for the GRAAL apparatus at the ESRF. Its monitoring system is presented in detail. Results from tests and the performance obtained during the first GRAAL experiments are given. The energy calibration accuracy and stability reached is a small fraction of the intrinsic detector resolution.
Milder is better? advantages and disadvantages of "mild" ovarian stimulation for human in vitro fertilization
Alberto Revelli, Simona Casano, Francesca Salvagno, Luisa Delle Piane
Reproductive Biology and Endocrinology , 2011, DOI: 10.1186/1477-7827-9-25
Abstract: Since the early ages of human in-vitro fertilization (IVF) it turned out clearly that the effectiveness of the procedure when performed on a natural, single-egg cycle was very limited. An important step toward getting better results was represented by the availability of medications able to induce multiple ovulation. For several years, and until now, ovarian stimulation with exogenous hormones has been widely applied with the aim of increasing the number of oocytes available for fertilization [1]. For years pharmaceutical companies have been competing on the market using as a tool the potency of their respective drugs to get more oocytes. Cancelling cycles in which ovarian stimulation obtains a low number of developing follicles has become a popular choice, especially in Countries in which the fierce competition among IVF clinics is based on the pregnancy rate, and thus it is inconvenient to go on with cycles in which a poor oocyte yield is predictable. Furthermore, in Countries where either the public health system or the private insurance system offer for free (or at very low costs) only a limited number of attempts, the yield of at least a dozen of oocytes is considered of great value by IVF doctors and, as a consequence, by patients. Again, IVF clinics running an oocyte donation program are particularly satisfied when a patient produces enough eggs to be treated herself and to give surplus oocytes to donation. More oocytes-more embryos-more pregnancies = better IVF program: the most widely accepted principle all over the IVF world.However, it is out of discussion that the need of getting a rather high number of oocytes arises from the overall inefficiency of IVF laboratory procedure: several oocytes are needed to finally get just a few embryos and much less born babies. It is easy to calculate that the live birth rate/inseminated oocyte is extremely low in human IVF, on the average around 2-4%. Thus, the complex and demanding ovarian stimulation protocols are us
Prognostic factors influencing morbidity and mortality in esophageal carcinoma
Cariati, Andrea;Casano, Alessandro;Campagna, Antonello;Cariati, Erminio;Pescio, Gianluigi;
Revista do Hospital das Clínicas , 2002, DOI: 10.1590/S0041-87812002000500002
Abstract: purpose: in 1980, operative mortality for esophageal resection was 29%. over the last 15 years, technical and critical care improvements contributed to the reduction of postoperative mortality rate to 8%. the aim of this study is to analyze retrospectively the role of different factors (surgical procedure, stage of the disease, and anesthetic risk) on the postoperative mortality of 63 patients that underwent esophagectomy with gastric interposition for cancer. methods: seventy-two patients underwent esophagectomy. the stomach was the esophageal substitute in 63 cases. surgical procedures included transthoracic esophagectomy in 49 patients and transhiatal esophagectomy in 14 cases. among the 49 transthoracic esophagectomy patients, there were 18 patients with a high anesthetic risk (asa iii). among the patients that underwent transhiatal esophagectomy, there were 10 patients with a high anesthetic risk (asa iii). results: the operative mortality rate was 14% (2/14) in transhiatal esophagectomy group and 22% (11/49) in transthoracic esophagectomy group (p = ns). the postoperative mortality of patients with a high anesthetic risk (asa iii) was 47% (8/17) after transthoracic esophagectomy and 10% (1/10) after transhiatal esophagectomy (p <0.05). discussion: in our experience, the operative mortality was nearly 18% (16.6% after transhiatal esophagectomy and 20.8% after transthoracic esophagectomy). among the patients with a high anesthetic risk (asa iii) that underwent surgery, the postoperative mortality was significantly lower after transhiatal esophagectomy (10%) compared to transthoracic esophagectomy (47%) (p <0.05).
Prognostic factors influencing morbidity and mortality in esophageal carcinoma
Cariati Andrea,Casano Alessandro,Campagna Antonello,Cariati Erminio
Revista do Hospital das Clínicas , 2002,
Abstract: PURPOSE: In 1980, operative mortality for esophageal resection was 29%. Over the last 15 years, technical and critical care improvements contributed to the reduction of postoperative mortality rate to 8%. The aim of this study is to analyze retrospectively the role of different factors (surgical procedure, stage of the disease, and anesthetic risk) on the postoperative mortality of 63 patients that underwent esophagectomy with gastric interposition for cancer. METHODS: Seventy-two patients underwent esophagectomy. The stomach was the esophageal substitute in 63 cases. Surgical procedures included transthoracic esophagectomy in 49 patients and transhiatal esophagectomy in 14 cases. Among the 49 transthoracic esophagectomy patients, there were 18 patients with a high anesthetic risk (ASA III). Among the patients that underwent transhiatal esophagectomy, there were 10 patients with a high anesthetic risk (ASA III). RESULTS: The operative mortality rate was 14% (2/14) in transhiatal esophagectomy group and 22% (11/49) in transthoracic esophagectomy group (P = ns). The postoperative mortality of patients with a high anesthetic risk (ASA III) was 47% (8/17) after transthoracic esophagectomy and 10% (1/10) after transhiatal esophagectomy (P <0.05). DISCUSSION: In our experience, the operative mortality was nearly 18% (16.6% after transhiatal esophagectomy and 20.8% after transthoracic esophagectomy). Among the patients with a high anesthetic risk (ASA III) that underwent surgery, the postoperative mortality was significantly lower after transhiatal esophagectomy (10%) compared to transthoracic esophagectomy (47%) (P <0.05).
Limits on light-speed anisotropies from Compton scattering of high-energy electrons
J. -P. Bocquet,D. Moricciani,V. Bellini,M. Beretta,L. Casano,A. D'Angelo,R. Di Salvo,A. Fantini,D. Franco,G. Gervino,F. Ghio,G. Giardina,B. Girolami,A. Giusa,V. G. Gurzadyan,A. Kashin,S. Knyazyan,A. Lapik,R. Lehnert,P. Levi Sandri,A. Lleres,F. Mammoliti,G. Mandaglio,M. Manganaro,A. Margarian,S. Mehrabyan,R. Messi,V. Nedorezov,C. Perrin,C. Randieri,D. Rebreyend,N. Rudnev,G. Russo,C. Schaerf,M. L. Sperduto,M. C. Sutera,A. Turinge,V. Vegna
Physics , 2010, DOI: 10.1103/PhysRevLett.104.241601
Abstract: The possibility of anisotropies in the speed of light relative to the limiting speed of electrons is considered. The absence of sidereal variations in the energy of Compton-edge photons at the ESRF's GRAAL facility constrains such anisotropies representing the first non-threshold collision-kinematics study of Lorentz violation. When interpreted within the minimal Standard-Model Extension, this result yields the two-sided limit of 1.6 x 10^{-14} at 95% confidence level on a combination of the parity-violating photon and electron coefficients kappa_{o+} and c. This new constraint provides an improvement over previous bounds by one order of magnitude.
Measurement of the Σ beam asymmetry for the ω\ photo-production off the proton and the neutron at GRAAL
V. Vegna,A. D'Angelo,O. Bartalini,V. Bellini,J. P. Boquet,M. Capogni,L. E. Casano,M. Castoldi,F. Curciarello,V. De Leo,J. P. Didelez,R. Di Salvo,A. Fantini,D. Franco,G. Gervino,F. Ghio,G. Giardina,B. Girolami,A. Giusa,A. Lapik,P. Levi Sandri,A. Lleres,F. Mammoliti,G. Mandaglio,M. Manganaro,D. Moricciani,A. Mushkarenkov,V. Nedorezov,C. Randieri,D. Rebreyend,N. Rudnev,G. Russo,C. Schaerf,M. L. Sperduto,M. C. Sutera,A. Turinge,I. Zonta
Physics , 2013, DOI: 10.1103/PhysRevC.91.065207
Abstract: We report on new measurements of the beam asymmetry for \omega\ photo-production on proton and neutron in Hydrogen and Deuterium targets from the GRAAL collaboration. The beam asymmetry values are extracted from the reaction threshold (E_{\gamma} = 1.1 GeV in the free nucleon kinematics) up to 1.5 GeV of incoming photon energy. For the first time both the radiative and the three-pion decay channels are simultaneously investigated on the free proton. Results from the two decay channels are in agreement and provide important constraints for the determination of resonant state contributions to the \omega\ production mechanism. First experimental results on the deuteron allow the extraction of the \Sigma\ beam asymmetry on quasi-free nucleons. Comparison of the results for free and quasi-free kinematics on the proton shows a generally reasonable agreement, similar to the findings in pseudo-scalar meson photo-production reactions. For the first time measurements on quasi-free neutrons are available, showing that both the strength and the angular distributions of the beam asymmetry are sensibly different from the results on the proton target.
Beam asymmetry $Σ$ measurements on the $π^-$ photoproduction off neutrons
G. Mandaglio,F. Mammoliti,M. Manganaro,V. Bellini,J. P. Bocquet,L. Casano,A. D'Angelo,R. Di Salvo,A. Fantini,D. Franco,G. Gervino,F. Ghio,G. Giardina,B. Girolami,A. Giusa,A. Ignatov,A. Lapik,P. Levi Sandri,A. Lleres,D. Moricciani,A. N. Mushkarenkov,V. Nedorezov,C. Randieri,D. Rebreyend,N. V. Rudnev,G. Russo,C. Schaerf,M. L. Sperduto,M. C. Sutera,A. Turinge,V. Vegna,W. J. Briscoe,I. I. Strakovsky
Physics , 2010, DOI: 10.1103/PhysRevC.82.045209
Abstract: The $\Sigma$ beam asymmetry in the photoproduction of negative pions from quasi-free neutrons in a deuterium target was measured at Graal in the energy interval 700 - 1500 MeV and a wide angular range, using polarized and tagged photons. The results are compared with recent partial wave analyses.
Measurement of beam-recoil observables Ox, Oz and target asymmetry for the reaction gamma p -> K Lambda
A. Lleres,O. Bartalini,JP. Bocquet,P. Calvat,M. Capogni,L. Casano,A. D'Angelo,JP. Didelez,R. DiSalvo,A. Fantini,D. Franco,C. Gaulard,G. Gervino,F. Ghio,B. Girolami,A. Giusa,M. Guidal,E. Hourany,R. Kunne,V. Kuznetsov,A. Lapik,P. LeviSandri,F. Mammoliti,G. Mandaglio,D. Moricciani,AN. Mushkarenkov,V. Nedorezov,L. Nicoletti,C. Perrin,C. Randieri,D. Rebreyend,F. Renard,N. Rudnev,T. Russew,G. Russo,C. Schaerf,ML. Sperduto,MC. Sutera,A. Turinge
Physics , 2008, DOI: 10.1140/epja/i2008-10713-4
Abstract: The double polarization (beam-recoil) observables Ox and Oz have been measured for the reaction gamma p -> K Lambda from threshold production to Egamma = 1500 MeV. The data were obtained with the linearly polarized beam of the GRAAL facility. Values for the target asymmetry T could also be extracted despite the use of an unpolarized target. Analyses of our results by two isobar models tend to confirm the necessity to include new or poorly known resonances in the 1900 MeV mass region.
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