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Now showing items 1 - 16 of 171

  • La trachéotomie translaryngée selon la technique de Fantoni?: à propos de 104 observations

    D Divisi   G Altamura   C Battaglia   W Di Francescantonio   E Rosa   G Torresini   C De Sanctis   R Crisci  

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  • Local Surface Plasmon Resonance of metallic nanoparticles embedded in amorphous silicon

    Fantoni, A.   Fernandes, M.   Vigranenko, Y.   Vieira, M.  

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  • Modeling a-SiC:H Tandem Pinpin and Pinip Photodiodes for Color Sensor Application

    Fantoni, A.   Martins, J.   Fernandes, M.   Louro, P.   Vygranenko, Y.   Vieira, M.  

    The present paper reports the optical properties of multilayer structures composed by p-i-n cells based on a-SiC:H or a-Si:H material. Different structures are studied in order to obtain image sensors that accomplish color filtering in addition to image pattern recognition. A simple theoretical model is developed to explain sensors behavior and to derive the optical-readout experimental procedure. Electrical models for the sensors are established for simulation purposes and to compare photocurrent signals with experimental data. A numerical simulation of the JV characteristic and of the spectral response is also presented in order to show possible future optimization of the device. Two main structures are studied, namely p-i-n/p-i-n and p-i-n/n-i-p tandem cells.
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  • Photocurrent and Spectral Response Analysis of a-SiC:H Pinip and Pinpin Photodiodes

    Fantoni, A.   Vieira, M.   Vygranenko, Y.   Fernandes, M.   Louro, P.  

    We present in this paper results about the analysis of photocurrent and spectral response in a-SiC:H/a-Si:H pinpin and pinip structures. Our experiments and analysis reveal the photocurrent profile to have a strong nonlinear dependence on the externally applied bias and on the light absorption profile, i.e., on the incident light wavelength and intensity. Our interpretation points out the cause of such effect to a self biasing of the junctions under certain unbalanced light generation of carriers and to an asymmetric reaction of the internal electric fields to the externally imposed bias. The possibility to relate such a behavior to the light intensity and wavelength indicates realistic hypothesis of using these structures and this effect for color recognition sensors. We present results about the experimental characterization of the structures and numerical simulations obtained with the program ASCA. Considerations about electrical field profiles and inversion layers will be taken into account to explain the optical and voltage bias dependence of the spectral response. Our results show that in both structures the application of an external electrical bias (forward or reverse) mainly influences the field distribution within the less photo excited sub-cell.
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  • Biometric system based on one single large area a-SiC:H p-i-n photodiode

    Vieira, M.   Fernandes, M.   Fantoni, A.   Louro, P.   Schwarz, R.  

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  • Hydrogenated amorphous silicon speed sensor based on the flying spot technique

    Vieira, M.   Fantoni, A.   Macarico, A.   Soares, F.   Martins, R.  

    p-i-n devices based on hydrogenated amorphous silicon (a-Si:H) became fundamental elements of many different types of sensors, based on either the transverse or the lateral photovoltaic effect. We have previously developed a transient technique, called the flying spot technique (FST), based on the lateral photoeffect. FST allows us not only to infer the ambipolar diffusion length but also the effective lifetime of the photogenerated carriers once the light spot velocity and geometry of the structure are known. In this paper, we propose to apply this technique backwards in order to detect the path and velocity of an object that is moving through a light source. The light reflected back from the object is analyzed through a p-i-n structure where the transient transverse photovoltage is dependent on the object movement (position and velocity). Assuming the transport properties of the material and the geometry of the device are known, and using a triangulation method, we show that it is possible to map the object movement. Details concerning material characterization, simulation and device geometry are presented
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  • Modelling Heteroface of P.I.N Solar Cells for Improving Stability

    Fantoni, A.   Vieira, M.   Martins, R.  

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  • Bidimensional Numerical Analysis of A μc-Si:H P-I-N Photodiode under Local Illumination

    Fantoni, A.   Vieira, M.   Martins, R.  

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  • 703 TRANSLARYNGEAL TRACHEOSTOMY DEVELOPED BY FANTONI IN A PATIENT WITH FIXED CERVICAL SPINE

    REEKER, W   SADER, R   HAUCK, R   SCHNEIDER, G   KOCHS, E  

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  • Multilayer Architectures Based on a-SiC:H Material: Tunable Wavelength Filters in Optical Processing Devices

    Vieira, M.   Vieira, M. A.   Louro, P.   Costa, J.   Fernandes, M.   Fantoni, A.   Barata, M.  

    The characteristics of tunable wavelength filters based on a-SiC:H multilayered stacked pin cells are studied both theoretically and experimentally. The optical transducers were produced by PECVD and tested for a proper fine tuning of the cyan and yellow fluorescent proteins emission. The active device consists of a p-i'(a-SiC:H)-n/p-i(a-Si:H)-n heterostructures sandwiched between two transparent contacts. Experimental data on spectral response analysis, current-voltage characteristics and color and transmission rate discrimination are reported. Cyan and yellow fluorescent input channels were transmitted together, each one with a specific transmission rate and different intensities. The multiplexed optical signal was analyzed by reading out, under positive and negative applied voltages, the generated photocurrents. Results show that the optimized optical transducer has the capability of combining the transient fluorescent signals onto a single output signal without losing any specificity (color and intensity). It acts as a voltage controlled optical filter: when the applied voltages are chosen appropriately the transducer can select separately the cyan and yellow channel emissions (wavelength and frequency) and also to quantify their relative intensities. A theoretical analysis supported by a numerical simulation is presented.
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  • Enhancing tumour dose via improved antibody radiohalogenation methods and alpha-emitting 211At

    Fantoni, A.   Fernandes, M.   Louro, P.   Vieira, M.A.   Vieira, M.  

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  • Detection of Change in Fluorescence Between Reactive Cyan and the Yellow Fluorophores Using a-SiC:H Multilayer Transducers

    Vieira, M.   Costa, J.   Vieira, M. A.   Louro, P.   Fernandes, M.   Fantoni, A.  

    Optical colour sensors based on multilayered a-SiC:H heterostructures can act as voltage controlled optical filters in the visible range. In this article we investigate the application of these structures for Fluorescence Resonance Energy Transfer (FRET) detection, The characteristics of a-SiC:H multilayered structure are studied both theoretically and experimentally in several wavelengths corresponding to different fluorophores. The tunable optical p-i'(a-SiC:H)-n/p-i(a-Si:H)-n heterostructures were produced by PECVD and tested for a proper fine tuning in the violet, cyan and yellow wavelengths. The devices were characterized through transmittance and spectral response measurements, under different electrical bias and frequencies. Violet, cyan and yellow signals were applied in simultaneous and results have shown that they can be recovered under suitable applied bias. A theoretical analysis supported by numerical simulation is presented.
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  • Fantoni translaryngeal tracheostomy versus ciaglia blue rhino percutaneous tracheostomy: A retrospective comparison

    Duilio Divisi   Giuseppe Altamura   Sergio Di Tommaso   Gabriella Di Leonardo   Emilio Rosa   Carlo De Sanctis   Roberto Crisci  

    Purpose To compare the operative technique and complications of the Fantoni tracheostomy (TLT) with those of the Ciaglia Blue Rhino tracheostomy (CBR). We also compared the costs of mini-invasive tracheostomy with those of surgical tracheostomy (ST).
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  • Fantoni translaryngeal tracheostomy versus ciaglia blue rhino percutaneous tracheostomy: A retrospective comparison

    Duilio Divisi   Giuseppe Altamura   Sergio Di Tommaso   Gabriella Di Leonardo   Emilio Rosa   Carlo De Sanctis and Roberto Crisci  

    Purpose To compare the operative technique and complications of the Fantoni tracheostomy (TLT) with those of the Ciaglia Blue Rhino tracheostomy (CBR). We also compared the costs of mini-invasive tracheostomy with those of surgical tracheostomy (ST).
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  • NUMéRO SPéCIAL. L\"ITALIE DU TRIENNIO RéVOLUTIONNAIRE 1796-1799 || GIOVANNI FANTONI EN EXIL à GRENOBLE (1799)

    LAURO ROSSI  

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  • Percutaneous Tracheostomy: A Clinical Comparison of Dilatational (Ciaglia) and Translaryngeal (Fantoni) Techniques

    Westphal, Klaus   Byhahn, Christian   Wilke, Hans-Joachim   Lischke, Volker  

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