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OALib Journal期刊

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Acción y reflexión: actitud del estudiante hacia el aprendizaje y el servicio
Tumino,Marisa; Korniejczuk,Víctor;
Enfoques , 2012,
Abstract: resumen el estudio evalúa el rol de las prácticas de servicio comunitario donde la reflexión intencional acompa?a el programa. mediante un dise?o cuali-cuantitativo, se revelan los efectos de las prácticas reflexivas sobre el desarrollo reflexivo de los alumnos y asimismo pone de manifiesto el impacto de ese desarrollo reflexivo en la formación personal de los estudiantes, particularmente en la formación de sus actitudes hacia el servicio comunitario. se analizan las posibles relaciones entre los estadios reflexivos del estudiante definidos por green1 y las fases de definición de actitudes adoptados por shiarella, mccarthy y tucker.2 el estudio procuró probar si la reflexión en aprendizaje servicio actúa como motivador en el proceso reflexivo de los participantes y en la formación de actitudes hacia el servicio a la comunidad.
A working with a Silicon Position Sensitive Detector (dE%E calibration and isotopes separation)
V. Ostashko,A. Tumino,S. Romano
Physics , 2005,
Abstract: A method for the calibration of a Silicon Position Sensitive Detector is described. From the combination of the signals collected at the ends of the resistive electrode, energy and angle of the hitting particle are reconstructed with a procedure which straightforwardly accounts for different amplifier chain gains and dc offset effects.
Endotics system vs colonoscopy for the detection of polyps
Emanuele Tumino, Rodolfo Sacco, Marco Bertini, Michele Bertoni, Giuseppe Parisi, Alfonso Capria
World Journal of Gastroenterology , 2010,
Abstract: AIM: To compare the endotics system (ES), a set of new medical equipment for diagnostic colonoscopy, with video-colonoscopy in the detection of polyps.METHODS: Patients with clinical or familial risk of colonic polyps/carcinomas were eligible for this study. After a standard colonic cleaning, detection of polyps by the ES and by video-colonoscopy was performed in each patient on the same day. In each single patient, the assessment of the presence of polyps was performed by two independent endoscopists, who were randomly assigned to evaluate, in a blind fashion, the presence of polyps either by ES or by standard colonoscopy. The frequency of successful procedures (i.e. reaching to the cecum), the time for endoscopy, and the need for sedation were recorded. Sensitivity, specificity, positive predictive value (PPV) and negative predictive value (NPV) of the ES were also calculated.RESULTS: A total of 71 patients (40 men, mean age 51.9 ± 12.0 years) were enrolled. The cecum was reached in 81.6% of ES examinations and in 94.3% of colonoscopies (P = 0.03). The average time of endoscopy was 45.1 ± 18.5 and 23.7 ± 7.2 min for the ES and traditional colonoscopy, respectively (P < 0.0001). No patient required sedation during ES examination, compared with 19.7% of patients undergoing colonoscopy (P < 0.0001). The sensitivity and specificity of ES for detecting polyps were 93.3% (95% CI: 68-98) and 100% (95% CI: 76.8-100), respectively. PPV was 100% (95% CI: 76.8-100) and NPV was 97.7% (95% CI: 88-99.9).CONCLUSION: The ES allows the visualization of the entire colonic mucosa in most patients, with good sensitivity/specificity for the detection of lesions and without requiring sedation.
High critical fields in MgB2 thin films with various resistivity values
V. Ferrando,C. Tarantini,P. Manfrinetti,D. Marre',M. Putti,A. Tumino,C. Ferdeghini
Physics , 2003,
Abstract: In this paper, we analyze the upper critical field of four MgB2 thin films, with different resistivity (between 5 to 50 mWcm) and critical temperature (between 29.5 to 38.8 K), measured up to 28 Tesla. In the perpendicular direction the critical fields vary from 13 to 24 T and we can estimate 42-57 T range in other direction. We observe linear temperature dependence even at low temperatures without saturation, in contrast to BCS theory. Considering the multiband nature of the superconductivity in MgB2, we conclude that two different scattering mechanisms influence separately resistivity and critical field. In this framework, resistivity values have been calculated from Hc2(T) curves and compared with the measured ones.
Dependence on Frequency of the Electromagnetic Field Distribution inside a Cylindrical Cavity Excited through an Off-Axis Aperture
Fabrizio Consoli,Luigi Celona,Giovanni Ciavola,Santo Gammino,Fabio Maimone,Rocco Salvatore Catalano,Sebastiano Barbarino,David Mascali,Livia Tumino
Active and Passive Electronic Components , 2008, DOI: 10.1155/2008/859052
Abstract: To explain the relevant changes in the electron cyclotron resonance ion source behaviour for small variations of the exciting radiation frequency, we determine the spatial distribution of the field within the cavity for every resonant mode.
Two-dimensional TiOx nanostructures on Au(111): a Scanning Tunneling Microscopy and Spectroscopy investigation
F. Tumino,P. Carrozzo,L. Mascaretti,C. S. Casari,M. Passoni,S. Tosoni,C. E. Bottani,A. Li Bassi
Physics , 2015,
Abstract: We investigated the growth of titanium oxide two-dimensional (2D) nanostructures on Au(111), produced by Ti evaporation and post-deposition oxidation. Scanning tunneling microscopy and spectroscopy (STM and STS) and low-energy electron diffraction (LEED) measurements characterized the morphological, structural and electronic properties of the observed structures. Five distinct TiO\sub{x} phases were identified: the \emph{honeycomb} and \emph{pinwheel} phases appear as monolayer films wetting the gold surface, while nanocrystallites of the \emph{triangular}, \emph{row} and \emph{needle} phases grow mainly over the honeycomb or pinwheel layers. Density Functional Theory (DFT) investigation of the honeycomb structure supports a $(2\times 2)$ structural model based on a Ti-O bilayer having $\text{Ti}_2\text{O}_3$ stoichiometry. The pinwheel phase was observed to evolve, for increasing coverage, from single triangular crystallites to a well-ordered film forming a $(4\sqrt{7}\times 4\sqrt{7})R19.1^\circ$ superstructure, which can be interpreted within a moir\~A\c{opyright}-like model. Structural characteristics of the other three phases were disclosed from the analysis of high-resolution STM measurements. STS measurements revealed a partial metallization of honeycomb and pinwheel and a semiconducting character of row and triangular phases.
Occult HCV Infection: An Unexpected Finding in a Population Unselected for Hepatic Disease
Laura De Marco,Anna Gillio-Tos,Valentina Fiano,Guglielmo Ronco,Vittorio Krogh,Domenico Palli,Salvatore Panico,Rosario Tumino,Paolo Vineis,Franco Merletti,Lorenzo Richiardi,Carlotta Sacerdote
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0008128
Abstract: Occult Hepatitis C virus (HCV) infection is a new pathological entity characterized by presence of liver disease and absence or very low levels of detectable HCV-RNA in serum. Abnormal values of liver enzymes and presence of replicative HCV-RNA in peripheral blood mononuclear cells are also observed. Aim of the study was to evaluate occult HCV occurrence in a population unselected for hepatic disease.
Clinical impact of selective transarterial chemoembolization on hepatocellular carcinoma: A cohort study
Rodolfo Sacco, Marco Bertini, Pasquale Petruzzi, Michele Bertoni, Irene Bargellini, Giampaolo Bresci, Graziana Federici, Luigi Gambardella, Salvatore Metrangolo, Giuseppe Parisi, Antonio Romano, Antonio Scaramuzzino, Emanuele Tumino, Alessandro Silvestri
World Journal of Gastroenterology , 2009,
Abstract: AIM: To prospectively evaluate the short and long term clinical impact of selective transarterial chemoembolization (TACE) on liver function in patients with hepatocellular carcinoma (HCC). To assess side effects in relation to treatments. To analyze the overall survival and HCC progression free survival probability.METHODS: One hundred and seventeen cirrhotic patients with HCC were enrolled. Baseline liver function included Child-Pugh score and serum levels of alanine-aminotransferase (ALT), prothrombin time (PT) and bilirubin. According to Cancer Liver Italian Program (CLIP) and Barcelona Clinic Liver Cancer (BCLC) staging systems, 71 patients were eligible for TACE; 32 had previously received treatment for HCC. No significant differences in liver function were observed between previously treated and not treated patients. TACE was performed by selective catheterization of the arteries nourishing the lesions. While hospitalized, patients underwent clinical, hematologic and ultrasonographic assessments. One month after TACE a CT scan was performed to assess tumor response. A second TACE was performed “on demand”. Liver function tests were checked in all patients every four months.RESULTS: After first TACE, the mean Child-Pugh score increased from a mean baseline 5.62 ± 1.12 to 6.11 ± 1.57 at discharge time (P < 0.0001), decreasing after four months to 5.81 ± 0.73 (not significant). ALT, PT and bilirubin significantly (P < 0.0001) increased 24 h after TACE and progressively decreased until discharge. After the second TACE, variations in Child-Pugh score, ALT, PT and bilirubin were comparable to that described after the first TACE. No major complications were observed. The mean follow-up was 14.7 ± 6.3 mo (median: 16 mo). Only one patient died. No other patient experienced important long term worsening of clinical status. The overall survival probability at twenty-four months was 98.18% with a correspondent HCC progression free survival probability of 69%.CONCLUSION: Selective TACE may produce significant, but transitory increases in ALT values, with no major impact on liver function and Child-Pugh score. Preservation of liver function is achievable also in patients previously treated with other therapeutic modalities and in patients undergoing multiple TACE cycles. Liver function can remain stable in the long-term, with optimal medium term survival. This result can be achieved through rigorous patient selection on the basis of tumour characteristics and clinical conditions.
New measurement of the d(d,p)t reaction at astrophysical energies via the Trojan-horse method
Chengbo Li,Qungang Wen,Yuanyong Fu,Jing Zhou,Shuhua Zhou,Qiuying Meng,C. Spitaleri,A. Tumino,R. G. Pizzone,L. Lamia
Physics , 2015, DOI: 10.1103/PhysRevC.92.025805
Abstract: The study of d(d,p)t reaction is very important for the nucleosynthesis in both standard Big Bang and stellar evolution, as well as for the future fusion reactors planning of energy production. The d(d,p)t bare nucleus astrophysical S(E) factor has been measured indirectly at energies from about 400 keV down to several keV by means of the Trojan horse method applied to the quasi-free process $\rm {}^2H({}^6Li,pt){}^4He$ induced at a lithium beam energy of 9.5 MeV, which is closer to the zero quasi-free energy point. An accurate analysis leads to the determination of the $\rm S_{bare}(0)=56.7 \pm 2.0 keV \cdot b$ and of the corresponding electron screening potential $\rm U_e = 13.2 \pm 4.3 eV$. In addition, this work gives an updated test for the Trojan horse nucleus invariance comparing with previous indirect investigations using $\rm {}^3He=(d+p)$ breakup.
Big Bang nucleosynthesis revisited via Trojan Horse Method measurements
R. G. Pizzone,R. Sparta,C. A. Bertulani,C. Spitaleri,M. La Cognata,J. Lalmansingh,L. Lamia,A. Mukhamedzhanov,A. Tumino
Physics , 2014, DOI: 10.1088/0004-637X/786/2/112
Abstract: Nuclear reaction rates are among the most important input for understanding the primordial nucleosynthesis and therefore for a quantitative description of the early Universe. An up-to-date compilation of direct cross sections of 2H(d,p)3H, 2H(d,n)3He, 7Li(p,alpha)4He and 3He(d,p)4He reactions is given. These are among the most uncertain cross sections used and input for Big Bang nucleosynthesis calculations. Their measurements through the Trojan Horse Method (THM) are also reviewed and compared with direct data. The reaction rates and the corresponding recommended errors in this work were used as input for primordial nucleosynthesis calculations to evaluate their impact on the 2H, 3,4He and 7Li primordial abundances, which are then compared with observations.
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