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[en] The aim is to describe the development of programmed and micro-programmed system for signal processing (accumulation, histogram, Fourier transform, correlation, convolution, digital filtering etc...). The following points will be discussed: possibilities and limitations of systems based on universal computers, addition of specialized terminals, specialized computers for signal processing. Two typical laboratory studies will be described: adaptation of basic type advanced languages to signal processing, description of a new structure of operators suitable for treatments of repetitive algorithms on blocks of data
[fr]On se propose de decrire l'evolution des systemes programmes et microprogrammes pour le traitement du signal (accumulation, histogramme, transformee de Fourier, correlation, convolution, filtrage numerique, etc...). On abordera les points suivants: possibilites et limitations des systemes a base de calculateur universel, adjonction de peripheriques specialises, calculateurs specialises pour le traitement du signal. On decrira deux etudes types du laboratoire: une adaptation de langages evolues type Basic au traitement du signal, une description d'une nouvelle structure d'operateurs adaptes aux traitements d'algorithmes repetitifs sur des blocs de donnees
[en] Improvements made to the general programmed signal acquisition and processing system, Plurimat S, are described, the aim being to obtain a less specialized system adapted to the biological and medical field. In this modified system the acquisition will be simplified. The standard processings offered will be integrated to a real advanced language which will enable the uses to create his own processings, the loss of speed being compensated by a greater flexibility and universality. The observation screen will be large and the quality of the recording very good so that a large signal fraction may be displayed. The data will be easily indexed and filed for subsequent display and processing. This system will be used for two kinds of task: it can either be specialized, as an integral part of measurement and diagnostic preparation equipment used routinely in clinical work (e.g. vectocardiographic examination), or its versatility can be used for studies of limited duration to gain information in a given field or to study new diagnosis or treatment methods
[fr]On a decrit les perfectionnements apportes au systeme general programme d'acquisition et de traitement de signaux, le Plurimat S, dans le but d'aboutir a un systeme moins specialise adapte au domaine biologique et medical. Dans ce systeme modifie, l'acquisition sera simplifiee. Les traitements standards proposes seront integres a un veritable langage evolue qui permettra a l'utilisateur de se creer ses propres traitements; la baisse de rapidite sera compensee par une plus grande souplesse et universalite. La visualisation sera de grande taille et de tres bonne qualite pour permettre de visualiser une tranche de signal importante. Les donnees seront facilement repertoriees, archivees, pour etre ensuite visualisees et traitees. Ce systeme sera employe a deux sortes de taches: soit en se specialisant, comme partie integrante d'appareils, de mesures et de preparation de diagnostics utilises en routine en clinique (ex: examen de vectocardiographie); soit en utilisant sa souplesse pour permettre a des chercheurs de realiser des etudes de duree limitee permettant de mieux connaitre un domaine ou d'etudier de nouvelles methodes de diagnostics ou de traitement
[en] The CINE 200 system, although using a small computer to reduce costs, is shown to be a highly efficient instrument for the processing of scintigraphic images. This was achieved by creating an acquisition and display system branched directly onto the memory, reducing the processing times by the writing of fast micro-programmes, and cutting down the place occupied by the programmes in the live memory by a good organization of these programmes. This internal organization of the system, the insertion and role of the programmes, the data organization and the working procedure are described briefly
[fr]On a montre que le systeme CINE 200, bien qu'utilisant un petit calculateur pour minimiser le cout, est un instrument tres performant dans le traitement des images scintigraphiques. Ce resultat a ete obtenu en creant un systeme d'acquisition et de visualisation travaillant en acces direct sur la memoire; en diminuant les temps de traitement par l'ecriture de microprogrammes rapides et en minimisant la place occupee en memoire vive par les programmes par une bonne organisation de ceux-ci. On a decrit brievement cette organisation interne du systeme, l'implantation et le role des programmes, l'organisation des donnees et le fonctionnement
[en] This paper aims at briefly describing the design and construction issues of the stellarator of Costa Rica 1 (SCR-1). The SCR-1 is a small modular Stellarator for magnetic confinement of plasma developed by the Plasma Physics Group of the Instituto Tecnologico de Costa Rica (ITCR). The SCR-1 is based on the small Spanish Stellarator UST1 (Ultra Small Torus 1), created by Eng. Vicente Queral. These mains issues consist of the size of the Stellarator, closeness between coils, coupling of ECH to the vacuum chamber and the device for support. The size has become a problem because the vacuum chamber does not allow a lot of space to attach diagnosis devices, the heating system, the vacuum system and the very same support of the chamber. As a result of this lack of space, the Stellarator's coils are placed very close to each other; this means that two of the coils around of the vacuum chamber clash and cannot be placed as designed. The issue regarding the coupling of the ECH (electron cyclotron radio-frequency) to the vacuum chamber comprises the fact that the wave guide with rectangular shape does not match the CF port with circular shape on the vacuum chamber. In addition, the device for supporting the Stellarator has presented a challenge because of its size and the placement of the coils; in other words, there is not enough space between the ports and coils in the Stellarator to place appropriately the device for support.
[en] The exodiffusion of hydrogen in a-Si prepared by silane decomposition has been previously studied using H(B11,α)αα nuclear reaction and conductivity measurements which show that it takes place in two stages, one centered at 723 K, the other at 853 K. The first stage is due to the diffusion of 'weakly' bond H. The second stage which we study quantitatively here by EPR, has an activation energy of 3.6 eV corresponding to the liberation of a bond hydrogen. The fact that the EPR signal is related to the second stage governed by a process whose activation energy is equal to the Si-H bond energy is a direct evidence that the EPR signal is associated with dangling bonds which were saturated by hydrogen. (orig.)
[en] This paper describes briefly the design and construction of a small modular stellarator for magnetic confinement of plasma, called Stellarator of Costa Rica 1, or SCR-1; developed by the Plasma Physics Group of the Instituto Tecnológico de Costa Rica, PlasmaTEC. The SCR-1 is based on the small Spanish stellarator UST1, created by the engineer Vicente Queral. The SCR-1 will employ stainless steel torus-shaped vacuum vessel with a major radius of 460.33 mm and a cross section radius of 110.25 mm. A typical SCR-1 plasma will have an average radius 42.2 mm and a volume of 8 liters (0.01 m3), and an aspect ratio of 5.7. The magnetic resonant field will be 0.0878 T, and a period of 2 (m=2) with a rotational transform of 0.3. The magnetic field will be provided by 12 modular coils, with 8 turns each, with an electrical current of 8704 A per coil (1088 A per turn of each coil). This current will be fed by a bank of cell batteries. The plasma will be heated by ECRH with magnetrons of a total power of 5 kW, in the first harmonic at 2.45 GHz. The expected electron temperature and density are 15 eV and 1017 m−3 respectively with an estimated confinement time of 7.30 x 10−4 ms. The initial diagnostics on the SCR-1 will consist of a Langmuir probe, a heterodyne microwave interferometer, and a field mapping system. The first plasma of the SCR-1 is expected at the end of 2011.