1,721,011 research outputs found
Modelling the Electronic Characteristics of Carbon Nanotubes
No full textIn this paper a procedure to determine the dispersion relationship of the Carbon NanoTubes
(CNT) is proposed. The method is based on the application to band-structure calculation of both of them the
tight-binding approximation and the theory of Linear Combination of Atomic Orbitals (LCAO), obtaining a
reduction of computational time compared to other methods proposed in literature
An Electronic Medical Device for Preventing and Improving the Assisted Ventilation of Intensive Care Unit Patients
No full textThe survival of patients submitted to Intensive Care Unit is often related to the mechanical ventilation, which makes up for serious respiratory insufficiencies but can also become a lethal health risk. To decrease these risks, the respiratory cycle has to be continuously monitored and a real-time suitable setting of the ventilator is required, in order to realize natural breathing similar conditions. In this paper we propose a microcontroller-based digital electronic device, designed and realized with reference to the most advanced and reliable electronic technologies, oriented to the monitoring of the respiratory cycle and the relevant ventilator setting. Moreover the device allows the effective auscultation, the accurate processing and the detailed visualization (temporal and frequency graphs) of any lung sound. Then, it is suitable for the continuous real-time monitoring of breathing functions, resulting also very useful to diagnose respiratory pathologies
Criteri di progetto dei MOSFET submicrometrici per alte prestazioni
No full textIn questo lavoro vengono esaminati i criteri di progetto dei MOSFET submicrometrici per alte prestazioni, illustrando le problematiche connesse ad una miniaturizzazione spinta del dispositivo e le soluzioni tecnologiche previste, allo scopo di ottimizzarne le caratteristiche e di mettere in evidenza i motivi per cui si adotta una determinata soluzione tecnologica *** In this paper the design rules of nanoMOSFETs for high performance are examined. The problems dealing with nanodevices are illustrated to define the technological solutions to optimise the device characteristics
Il futuro della tecnologia: le nanotecnologie
No full textThe aim of this paper is to define the scientific progress limits and consequently the determinant role of nanotechnologies, which are a true revolution and the possible solution for not stopping the progress. Moreover the main drawbacks dealing with nanotechnologies are examined by a concise study of more important nanodevices, with a note about their possible applications to everyday life.
At last the unresolved problems and the hardware prospects are highlighted
An Innovative System for Home Tele-assistance in Real Time
No full textIn this work we propose an innovative system, which allows to the doctor to carry out a complete cardio-respiratory control on remote patients in real time. The proposed system, prototyped at the Electronic Devices Laboratory (Department of Electrical and Information Engineering) of Polytechnic University of Bari, Italy, has been also verified by the heart specialists of the U.O. of Cardiology in the General Hospital (Polyclinic) of the University of Bari, Italy
Modelling and Implementation of Subthreshold Currents In Schottky Barrier Cntfets For Digital Applications
No full textThe aim of this paper is to model and characterize the current voltage characteristics of Schottky Barrier (SB) Carbon NanoTube Field Effect Transistors (SB-CNTFETs) below and above threshold, in order to evaluate the noise margin and output voltage swing, whose values are necessary in the design of digital circuit
A Model Based on the Bloch-Floquet Theory for a Full Characterization and Design Optimization of 1-D Photonic Band Gap Waveguide Devices
No full textA model of Waveguide Photonic Band Gap (WPBG)
structures, based on Leaky Mode Propagation (LMP) method,
has been developed to perform a complete analysis of the
electromagnetic (e.m.) wave propagation including the radiation
loss for a structure of finite extension. The model allows to
determine the mode propagation constants, electromagnetic
harmonics and total field distribution, transmission and
reflection coefficients, total forward and backward power flow in
the structure, guided power and total losses. Moreover, the mode
amplitude attenuation constant, radiated power, the angle of
radiation and radiation efficiency both in the cover and
substrate, for both TE and TM modes, can be determined
Sistema di monitoraggio remoto continuo, non invasivo, della salute
No full textIn questo lavoro è presentato il progetto di un sistema di monitoraggio remoto continuo, non invasivo, della
salute. Tale sistema mette insieme tutti i vantaggi ed i pregi dei sistemi già esistenti, superandone i limiti con
soluzioni tecnologicamente innovative. In particolare il sistema consente una maggiore facilità d’uso ed
economicità, incrementa il numero dei parametri vitali monitorati con una considerevole riduzione
dell’hardware ed infine permette di individuare la posizione del soggetto ed attivare soccorsi in tempo reale
pur in situazioni di pericolo di vita lontano dalle mura domestiche
Investigation of a point-like and plane-wave excitation in 2D photonic bandgap microcavities using Green’s function method
No full textWe report on a new model for simulating wave propagation in two-dimensional photonic crystals (PhCs) by means of Green's functions rearranged to fit on the geometrical and physical properties of the structure under investigation. The model can take into account physical effects occurring when the PhC is excited by either a point-like source, for the analysis of extended crystals with line and point defects, or a plane wave coming from infinite, to investigate mirrors and microlenses. The model has been used for studying a Fabry-Peròt cavity to evaluate its response in presence of a Hankel source or a plane wave excitation. A parametric investigation of the filter response as a function of the cavity length has been carried out and the best conditions to obtain an increase of quality factor of each resonant cavity mode have been determine
Comparison of ABM SPICE library with Verilog-A for compact CNTFET model implementation
No full textIn this paper we have implemented the semi-empirical compact model for CNTFETs already proposed by us both in SPICE, using ABM library, and in Verilog-A in order to compare them.
Typical analogue circuits and logic blocks have been simulated and results have been presented to validate the implementation of the proposed CNTFET model both in Verilog-A and in SPICE.
The obtained results have been the same in static simulations and comparable in dynamic simulations, in which the differences are due to the better implementation of the capacitance model in Verilog-A.
We have found many advantages using Verilog-A: the development time in writing the model is shorter, the simulation run time much shorter and the software is much more concise and clear than schemes using ABM blocks in SPICE
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