Search results for "Tuni"

Quel coût d'opportunité dans l'utilisation du temps scolaire ? Réflexion sur l'efficacité du temps dans le processus éducatif

2006

06013; Cet article cherche à engager la réflexion sur la grande variété observée dans l'utilisation du temps scolaire, à l'école primaire notamment, et sur ses conséquences en termes de progressions et de réussite ultérieure des élèves.Plus particulièrement, il s'intéresse à l'efficacité du temps alloué par l'enseignant aux diverses activités composant le programme, et à la pertinence de la notion de coût d'opportunité. Il permet en fait par une discussion sur la comparaison des coûts d'opportunité des différents temps, d'enrichir la réflexion académique sur l'efficacité du temps scolaire.

Electrochemical fabrication of high k Al-Ta mixed oxides

2014

The pia mater at the site of the entry of blood vessels into the central nervous system

1982

The entry of blood vessels into the central nervous system (CNS) has been studied at the surface of the brain stem and the spinal cord of two cats and two rabbits. The study was carried out by scanning electron microscopy (SEM). The results obtained by SEM concerning the layers of the pia mater corresponded to those obtained by other authors who used transmission electron microscopy. Between the basal lamina of the superficial glial membrane of the CNS and the cells lining the subarachnoid space, a pial connective tissue space could be clearly recognized. The blood vessles crossing the subarachnoid space were also covered by leptomeningeal lining cells. At the site of entry of these blood v…

Análisis de los factores de éxito en el proceso de creación de empresas. Impacto en la supervivencia y en su capacidad de innovación

2017

El emprendimiento ha sido ampliamente estudiado. Al principio, el emprendedor fue tratado por la literatura como comerciante, actualmente el emprendedor se percibe desde la literatura como un agente innovador y de cambio. Esta perspectiva del emprendedor es la que se ha tenido en cuenta en esta tesis. La tesis se compone de tres estudios, los objetivos de los cuales son dos, por una parte determinar qué factores institucionales y económicos tienen una influencia en la creación de las empresas y por otra parte analizar cómo afecta el entorno, así como las características del emprendedor y la empresa a la supervivencia de la misma en el corto y medio plazo. Los resultados muestran que el nive…

Forest biorefineries – A business opportunity for the Finnish forest cluster

2011

Abstract Bioenergy and biomass-based products offer the greatest new opportunities for diversifying business in the forest cluster. In particular, biorefineries, which can be integrated into the pulp and paper industry, seem to have immense future potential. This article aims to explore the biorefinery concept and related new products and business operations, as well as new business strategies and company models, which are part of the biorefinery value chain. These factors, which contribute to the establishment and success of forest biorefineries, were examined using internet survey responses and compared between Scandinavia, North America and South America. This article looks at the result…

An Indo-French Virtual University Project

2016

Indo-French cooperation has existed for several decades, and has flourished in the recent period, with a number of flagship programmes and cross-border schemes in science, technology and management. Virtual universities refer to both conventional campus-based (hybrid and brick-and-mortar) universities offering online courses, and purely virtual universities with all their activities delivered online via the Internet. A virtual university is involved as a direct provider of learning opportunities and uses the Internet to deliver its programmes and courses while receiving tuition support. We propose in this ultimate chapter an innovative architecture for an Indo-French knowledge management sy…

A Laboratory Project for Advanced Control Methods: Control of a Neutralization Process

2003

Abstract A neutralization process is used in a laboratory project for experimenting advanced control techniques. Students may choose among several techniques to experience the behaviour of advanced controller action: adaptive control, GMG control, fuzzy control, self tuning fuzzy control, neural control, neuro-fuzzy control. The experience in advanced self tuning controller based on fuzzy logic is proposed for the control of a neutralization process. The test of a self tuning controller based on fuzzy logic is a very important case because the resulting structure of the controller is easy to implement and modify: the final results are compared with those deriving from the application of a c…

Viscoelastic bearings with fractional constitutive law for fractional tuned mass dampers

2015

Abstract The paper aims at studying the effects of the inherent fractional constitutive law of viscoelastic bearings used as devices for tuned mass dampers. First, the proper constitutive law of the viscoelastic supports is determined by the local constitutive law. Then, the characteristic force–displacement relationship at the top of the bearing is found. Taking advantage of the whole bearing constitutive laws, the tuning of the mass damper is proposed by defining the damped fractional frequency, which is analogous to the classical damped frequency. The effectiveness of the optimal tuning procedure is validated by a numerical application on a system subjected to a Gaussian white noise.

Sensorless low Range Speed Estimation and Parameter Identification of Induction Motor Drives Devoted to Lifts Automatic Rescue Devices

2010

In this paper a sensorless rotor speed estimation and parameter identification algorithm is presented. The algorithm is designed specifically for induction motor (IM) drives devoted to automatic rescue devices (ARD) used in lifts and hoist applications. Its peculiarity is that it is based on the sinusoidal steady state mathematical model of the IM and, therefore, can be implemented on a low cost micro-controller in a simple way, however without lacking in terms of dynamic performance. It is also capable of self tuning so that no information is required about the specific IM used in the ARD drive. Finally the algorithm allows also an appreciable energy saving of the ARD when compared to olde…

A systematic approach for fine-tuning of fuzzy controllers applied to WWTPs

2010

A systematic approach for fine-tuning fuzzy controllers has been developed and evaluated for an aeration control system implemented in a WWTP. The challenge with the application of fuzzy controllers to WWTPs is simply that they contain many parameters, which need to be adjusted for different WWTP applications. To this end, a methodology based on model simulations is used that employs three statistical methods: (i) Monte-Carlo procedure: to find proper initial conditions, (ii) Identifiability analysis: to find an identifiable parameter subset of the fuzzy controller and (iii) minimization algorithm: to fine-tune the identifiable parameter subset of the controller. Indeed, the initial locatio…