362 research outputs found
Serpente-ARRIVE Checklist E10
No full textARRIVE guidelines 2.0: author checklist: The ARRIVE Essential 10.<br
Frammento di scultura marmorea : serpente
No full textUn frammento marmoreo raffigurante un serpente viene descritto e commentato per stabilirne il possibile significato nello specifico contesto dei bagni medievali, ma anche tenendo conto della varietà di rimandi che l'iimmagine del serpente ha assunto in età classica.A marble fragment of a snake is described and briefly discussed in order to establish its significance in the specific context of the medieval baths but also considering the polysemy of the iconography in the classical period
Reproducibility analysis of diamond pixel detectors for large ionizing radiation fields
No full textThis work reports on reproducibility tests performed on 20 high-quality single-crystal chemical vapour deposition (scCVD) diamond samples. By the analysis of the average mobility-lifetime product of the photogenerated carriers, 12 samples were selected and arranged as pixels in a 2.5 × 2.5 cm2 mosaic detector. Measurements carried out under a large (4 cm diameter) X-ray beam show a very high pixel response uniformity (<1% standard deviation relative to the mean photocurrent value) for a wide range of applied bias voltages (20 ÷ 80 V). Results suggest a very high level of reproducibility, mostly due to the excellent quality of the bulk material, meeting the requirements for monitoring large ionizing radiation fields with no need for individual pixel calibration. Moreover, mobility-lifetime product demonstrated to be the most effective figure of merit for the selection of CVD diamond samples with reproducible detection performance
Panorami internazionali e vicissitudini di un rito
No full textLa finzione rituale del culto cocullese come espressione di religione popolare universale in opposizione al volto egemonico della cultura di massa. Il convegno ha scandagliato, del serpente, presenze materiali e immaginarie, diacroniche e sincroniche, comunque originate e diffuse nelle aree geografiche che vanno dal bacino tirrenico e provenzale ai paesi adriatici, dal Mar Ionio all’Egeo e al Mar di Levante
Upgrade and present limitations of solar thermionic-thermoelectric technology up to 1000 K
No full textThe thermal and electrical performance of the innovative solar thermionic-thermoelectric generator (ST2G) has been carefully analyzed by using a high-flux solar simulator. Specific technological solutions have been inte-grated with respect to the first prototype for the operational testing at the moderate temperature range of 700–1000 K. The influence of spacers with different thickness has been studied to quantify the reduction of output current due to space-charge effect, whereas a BaF2-based coating has been deposited on the anode to make its work function (~2.1 eV) approach the cathode one, on which a hydrogen-terminated nitrogen doped nano-diamond film acts as emitter (work function of ~2.0 eV). The engineered ceramic absorber has demon-strated to be a reliable selective solar absorber with a high solar-to-thermal efficiency of 84% for solar con-centration ratio of 200 suns, extrapolated to 83% at 500 suns. As expected, the thermionic energy converter still provides a small converted power. However, the minimum inter-electrode spacing used (50 μm) and the engi-neered anode allow to better figure out the present limitations in the electrical power generation and how to surpass them in the near future
Panorami internazionali e vicissitudini di un rito ofidico
No full textIl testo introduce gli Atti dal convegno internazionale “I serpenti nell’area del Mediterraneo: culti, riti, miti”, tenuto a Cocullo nel 2008 dal Centro Studi Tradizioni Popolari "Alfonso M. Di Nola". Gli interventi di Vincenzo Ferri (erpetologo), Panayiota Andrianopoulou (etnologa), Francesco D’Andria (archeologo), Manuel Mandianes (etnologo), Khaled Fouad Allam (sociologo del mondo islamico), Brizio Montinaro (scrittore ed etnologo), Gianni Pizza (antropologo culturale) e Riccardo Di Segni (rabbino capo di Roma) hanno scandagliato, del serpente, presenze materiali e immaginarie, diacroniche e sincroniche, comunque collocabili nelle aree geografiche che vanno dall’Algero-Provenzale al bacino tirrenico, dallo spazio culturale dei paesi adriatici al mar Ionio, all’Egeo e al mar di Levante. Se le religioni monoteiste, nel corso dei secoli, hanno cancellato l’ambivalenza del serpente, trasformandola in accezione decisamente negativa (fu soprattutto il pensiero cristiano medievale a dipingere queste creature come abitanti dell’inferno ed emanazioni del demonio), in conclusione è nel folklore che persistono le maggiori tracce dell’ambivalenza e della positività: per esempio, oggi è possibile ravvisare culti ofidici a Cocullo, a Pretoro, in Grecia, nel Sud-Est asiatico e in India
Combined electrical resistivity-electron reflectivity measurements for evaluating the homogeneity of hydrogen-terminated diamond surfaces
No full textThe homogeneity of hydrogen termination on single-crystal CVD diamond surfaces exposed to air was studied with a new approach that encloses a combination of sheet resistance measurements, performed using four-point-probe method in Van Der Pauw configuration, and electron reflectivity measurements performed at intermediate kinetic energy to derive surface sensitive information on the chemical terminations (inelastic mean free path <0.8 nm). The coherence between the 2-dimensional spatial distributions of sheet resistance and electron reflectivity maps, as well as their similar dynamic range and consistency with an electron energy loss analysis, demonstrates that the proposed combined approach allows for a reliable and easy evaluation of both the effectiveness and homogeneity of the hydrogen-termination process of a diamond surface
Combined electrical resistivity-electron reflectivity measurements for evaluating the homogeneity of hydrogen-terminated diamond surfaces
No full textThe homogeneity of hydrogen termination on single-crystal CVD diamond surfaces exposed to air was studied with a new approach that encloses a combination of sheet resistance measurements, performed using four-point-probe method in Van Der Pauw configuration, and electron reflectivity measurements performed at intermediate kinetic energy to derive surface sensitive information on the chemical terminations (inelastic mean free path <0.8 nm). The coherence between the 2-dimensional spatial distributions of sheet resistance and electron reflectivity maps, as well as their similar dynamic range and consistency with an electron energy loss analysis, demonstrates that the proposed combined approach allows for a reliable and easy evaluation of both the effectiveness and homogeneity of the hydrogen-termination process of a diamond surface
Orthorhombic undoped κ-Ga2O3 epitaxial thin films for sensitive, fast, and stable direct X-ray detectors
No full textPhotoelectronic properties of orthorhombic undoped κ-Ga2O3 epitaxial thin films, grown on sapphire substrates by metal-organic vapour phase epitaxy, were evaluated under X-ray irradiation (CuKα line, 8.05 keV) for the first time. Photoresponse linearity at low dose-rates (varying in the 10-200 μGy s−1 range), and excellent detection sensitivity (up to 342.3 μC Gy−1 cm−3), were demonstrated even at very low applied electric fields (down to 0.001 V μm−1). Photocurrent rise time was evaluated to be <0.5 s, and signal stability was assessed for exposure times up to 2 h, highlighting no degradation of the performance. These encouraging results, mostly due to the extremely low dark current measured (in the pA range), suggest that orthorhombic undoped κ-Ga2O3 is a promising material for the fabrication of sensitive and stable large-area X-ray detectors with minimum power consumption
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