The economic feasibility analysis of generated photovoltaic energy in the USTO campus

The aim of this study is to analyze the economic impact of photovoltaic energy generation by a prospective campus microgrid to be installed at the University of Science and Technology (USTO). In this work, hourly solar irradiation and temperature data provided from the local weather office is used to study the distribution and duration of solar radiation over the campus. The generated solar photovoltaic energy is analyzed taking into account the economic aspects such as the photovoltaic system capital investment cost and the annual power generation cash flow. The installed power of the photovoltaic plant was calculated and the generated energy estimed. The feasility analysis shows a payback year of of 10,3, an internal rate of return of 5% and a profitability index of 1. © 2019, Wydawnictwo SIGMA-NOT. All rights reserved

Reprogrammable Controller Design From High-Level Specification

Existing techniques in high-level synthesis mostly assume a simple controller architecture model in the form of a single FSM. However, in reality more complex controller architectures are often used. On the other hand, in the case of programmable processors, the controller architecture is largely defined by the available control-flow instructions in the instruction set. With the wider acceptance of behavioral synthesis, the application of these methods for the design of programmable controllers is of fundamental importance in embedded system technology. This paper describes an important extension of an existing architectural synthesis system targeting the generation of ASIP reprogrammable architectures. The designer can then generate both style of architecture, hardwired and programmable, using the same synthesis system and can quickly evaluate the trade-offs of hardware decisions

Magnons coherent transmission and its heat transport at ultrathin insulating ferromagnetic nanojunctions

A model calculation is presented for the magnons coherent transmission and corresponding heat transport at magnetic insulating nanojunctions. The system consists of a ferromagnetically ordered ultrathin insulating junction between two semi-infinite ferromagnetically ordered leads. Spin dynamics are analyzed using the equations of motion for the spin precession displacements, valid for the range of temperatures of interest. Coherent scattering cross-sections at the junction boundary are calculated using the phase field matching theory, for all the incidence angles on the boundary from the lead bands, for arbitrary angles of incidence, at variable temperatures, and for different nano thicknesses of the ultrathin junction. The model is general; it is applied in particular to the Fe/Gd/Fe system with a sandwiched ferromagnetic Gd junction. It yields also the thermal conductivity due to the magnons coherent transmission between the two leads when these are maintained at slightly different temperatures. The calculation is carried out for state of the art values of the exchange constants, and elucidates the relation between the coherent scattering transmission of magnons and their thermal conductivity, for different thicknesses

Magnons coherent transmission and its heat transport at ultrathin insulating ferromagnetic nanojunctions

A model calculation is presented for the magnons coherent transmission and corresponding heat transport at magnetic insulating nanojunctions. The system consists of a ferromagnetically ordered ultrathin insulating junction between two semi-infinite ferromagnetically ordered leads. Spin dynamics are analyzed using the equations of motion for the spin precession displacements, valid for the range of temperatures of interest. Coherent scattering cross-sections at the junction boundary are calculated using the phase field matching theory, for all the incidence angles on the boundary from the lead bands, for arbitrary angles of incidence, at variable temperatures, and for different nano thicknesses of the ultrathin junction. The model is general; it is applied in particular to the Fe/Gd/Fe system with a sandwiched ferromagnetic Gd junction. It yields also the thermal conductivity due to the magnons coherent transmission between the two leads when these are maintained at slightly different temperatures. The calculation is carried out for state of the art values of the exchange constants, and elucidates the relation between the coherent scattering transmission of magnons and their thermal conductivity, for different thicknesses

Régimes de brebis à l’entretien, à base de cactus: Digestibilité, niveau d’alimentation, glycémie et urémie

The objective of this study is to determine the diet of the most appropriate Opuntia able to cover maintenance requirements in extreme drought with the least economic cost of the ration and its impact on digestibility, feeding level and blood glycemia and uremia. The incorporation of spineless Opuntia was conducted on 16 dry ewes, maintenance, in cross breed: (diet 1 versus diet 4) and (diet 2 versus diet 3), divided into 4 lots: diet 1 control (barley straw + barley grain), diet 2 (Opuntia + straw), diet 3 (straw + Opuntia + faba bean), diet 4 (Opuntia) only, by comparing them. The results showed that the digestibility of Opuntia improves the digestibility of organic matter in straw-based diets; it is in the range of 0.72, 0.63, 0.67, and 0.74, respectively. Analysis of variance of feeding levels showed that there is a significant difference at p<0.01. The regime 2 recorded a mean weight gain of 26 g. He covered the maintenance requirements and the cost of the ration evaluated 12.5 DA is 0.11 €. The results of blood glycemia (g/l) has remained the standards of the sheep. Uremia the régime 3 has increased significantly. The incorporation of Opuntia has been able can meet the energy needs of animals and that the cladode Opuntia can substitute at barley grains.L’objectif de cette étude est de déterminer le régime le plus adéquat à base d’Opuntia capable de couvrir les besoins d’entretien en condition d’extrême sécheresse, avec le moindre coût économique et son impact sur la digestibilité, le niveau d’alimentation, le taux de glycémie et d’urémie. L’incorporation de l’Opuntia inerme a été menée sur 16 brebis, à l’entretien, en cross over: (régime 1 versus régime 4) et (régime 2 versus régime 3); reparties en 4 lots: régime 1 témoin (paille d’orge + orge en grains), régime 2 (paille + Opuntia), régime 3 (paille + Opuntia + féverole), régime 4 (Opuntia) ; en les comparant entre eux. Les résultats de la digestibilité ont montré que l’Opuntia améliore la digestibilité de la matière organique des régimes à base de paille, elle est de l’ordre de 0,72; 0,63; 0,67; 0,74 respectivement. L’analyse de la variance des niveaux d’alimentation et des taux de glycémie et d’urémie a montré qu’il existe une différence significative à p<0,01. Le régime 2 a couvert les besoins d’entretien en énergie, un GMQ de 26 g et un coût de la ration évaluée à 12,5DA soit 0,11 €. Les résultats de la glycémie en (g/l) ont demeuré aux normes de l’espèce ovine. L’urémie du régime 3 a sensiblement augmenté. L’incorporation de l’Opuntia a pu satisfaire les besoins énergétiques des animaux et que la cladode d’Opuntia peut remplacer l’orge en grains

Design, Development and Implementation of Sensorless Digital Control of an Electric Motorization

The most industrial applications use the variation of the torque, speed and/or position in process, for which extremely severe specifications are needed. In the field of the drive of the electric machines, the elimination of the mechanical speed sensor can present an economic interest and improve safety of operation. One thus tries to make fulfill the speed measurement by implementing in a Digital signal processor (DSP) an algorithm of speed estimation using the current and voltage acquisition. Those methods become realizable on DSP of low costs. The goal of this work is to design, develop and implement of sensorless speed digital control of an electric motorization. The position and the mechanical speed of motor are calculated according to: observed rotor flux and the slip pulsation. The algorithm is implemented in DSPic30f of Microchip

Effects of additives on the sintering temperature and dielectric properties of ZnTiO3 based ceramic

International audienc

Three phase Inverter Speed Control of AC Drives Motor using DSPic microcontroller

AC drives based on full digital control have reached the status of a maturing technology in a broad range of applications, ranging from low-cost to high performance systems. In the field of the drive of the electric machines, the elimination of the mechanical speed sensor can present an economic interest and improve safety of operation. With speed estimation, sensorless vector control is possible, meaning that the speed of induction machines without mechanical speed sensors can be controlled. The flux observer is expanded into a combined flux and speed observer, measuring only stator current and voltage [1]. In this work, we develop algorithms of three phase inverter control of IM without speed sensor using DSPic microcontroller. We present two types of speed estimators based on the mathematical model of the machine. The first estimator is called MRAS (Model Reference Adaptive System). The second estimator, based on the estimation of the Back Electromotive Force (BEMF) of induction motor, is called Phase Locked Loop (PLL). A method of estimating the speed of an Induction Motor is proposed, analyzed and experimentally verified. DSPic based SVM controlled three phase inverter fed Induction Motor drive has been designed and implemented [2]