Scientific papers - Annals of "Dunarea de Jos" University of Galati - Analele științifice ale Universității "Dunărea de Jos" din Galați: Recent submissions
Afișează articolele 1381-1400 of 1845
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Influence of High Performance Voltage Converters Supply Upon the Induction Motors Behaviour
("Dunarea de Jos" University of Galati, 2002)The induction motors supply by converters leads to a distorted regime accompanied by some parasite torques and some supplementary losses. These aspects are emphasized further on because their quantitative determinations ... -
Comparison on Sensorless Control of Synchronous Motors
(Dunareade Jos University of Galati, 2002)The paper compares two different methods for speed and position estimation in AC permanent magnet synchronous motors vector control applications. The first method implies two observer blocks — one for the speed, and the ... -
Considerations on the Effect of Plastic Deformation Over the Magnetic Behavior of Soft Ferromagnetic alloy FE-3%SI NO
(2002)The paper synthetically presents the results obtained over the degradation of magnetic properties of soft ferromagnetic sheets Fe-3%Si NO required mechanically in plastic deformation area. Chronologically, the evolution ... -
Imperfect Data in Database Context. How are they Stored in Extended Relational Databases?
("Dunarea de Jos" University of Galati, 2002)Building a more accurate reality model requires taking into account imperfect information present in our knowledge and language. This paper presents several aspects of data imperfection in the database context and the ... -
Modeling, Identification and simulation of a Lighting Control System
("Dunarea de Jos" University of Galati, 2002)This paper presents the results of the first phase in the design of a control system for closed-loop regulation of the light amount in office-building rooms. This project is a joint development of Ghent University and ... -
Detecting the Liquid core in Continuous Casting Slabs by Load Torque Estimation in Unbending Zone
("Dunarea de Jos" University of Galati, 2002)The development in continuous casting process has been strongly dominated by the demands of quality improvement and reduced costs for steel products in recent years. To achieve these goals consideration has been given ... -
A Diferent Approach in the Parameters' Identification of a Jfet Using Genetic Algorithms
("Dunarea de Jos" University of Galati, 2002)The genetic algorithms are developing in three directions: the genetic algorithms theory, the genetic algorithms programming and the study of the problems that can be solved with genetic algorithms. In this paper it is ... -
Real Time wind Turbine Simulator Based on Frequency Controlled Servomotor
("Dunarea de Jos" University of Galati, 2002)This paper is a contribution to the development of a real time wind turbine simulator. The simulator is designed to generate wind power on its shaft, and provide the static and dynamic characteristics of a given turbine. ... -
Numerical Treatment of some Complex Dynamic Processes of Saturated Induction Machine
("Dunarea de Jos" University of Galati, 2002)Three variants for the mathematical models of the saturated induction machine (the exact one, the classical one and the simplified one) are used for the analysis of the reversal process combined with one short mechanical ... -
The Behavior Of Asymmetric Frontal Couplings With Permanent Magnets In Magnetic Powder And High Temperature Environments
("Dunarea de Jos" University of Galati, 2002)The main purpose of this paper is the comparative analysis of the behavior of frontal couplings with Nd-Fe-B permanent magnets in difficult environments, specific to metallurgy – such as environments with magnetic powders ... -
Integrating Hypermedia Objects in an Tutoring System
("Dunarea de Jos" University of Galati, 2001)The paper describes the internal architecture of an Intelligent Tutoring System, CSTutor. The architectural design of the tutorial system was developed in a collaborative work at the Department of Computer Science of the ... -
Analysis of a Neuro-Fuzzy Approach of Air Pollution: Building a Case Study
('Dunarea de Jos" University of Galati, 2001)This work illustrates the necessity of an Artificial Intelligence (AI)-based approach of air quality in urban and industrial areas. Some related results of Artificial Neural Networks (ANNs) and Fuzzy Logic (FL) for ... -
Modeling of the Biodegradation in Multiphase Stirred Tank Reactor
("Dunarea de Jos" University of Galati, 2001)The surface response methodology is used to verify predicted models and to adapt them on particular conditions of growth. The effect of solvent addition during the linear cell growth on the enhancement of biodegradation ... -
Software System for Generating, Identification and Simulation of the Biotechnological Processes Models
("Dunarea de Jos" University of Galati, 2001)The paper deals with the development of a software system (BIOCALC) for the modelling, identification and simulation of the biotechnological processes. BIOCALC is based on the algorithm developed by George Bastin and ... -
Supervisory Control Technique for an Assembly Workstation as a Dynamic Discrete Event System
("Dunarea de Jos" University of Galati, 2001)This paper proposes a control problem statement in the framework of supervisory control technique for the assembly workstations. A desired behaviour of an assembly workstation is analysed. The behaviour of such a workstation ... -
On Activity Modelling in Process Modelling
("Dunarea de Jos" University of Galati, 2001)The paper is looking to the dynamic feature of the meta-models of the process modelling process, the time. Some principles are considered and discussed as main dimensions of any modelling activity: the compatibility of ... -
Comments on Clock Models in Hybrid Automata and Hybrid Control Systems
("Dunarea de Jos" University of Galati, 2001)Hybrid systems have received a lot of attention in the past decade and a number of different models have been proposed in order to establish mathematical framework that is able to handle both continuous and discrete ... -
On Exponential and Asymptotic Estimation of State Variables in Bioprocesses
("Dunarea de Jos" University of Galati, 2001)The paper presents on-line estimation strategies for bioprocesses, which are characterized by strongly nonlinear dynamics. A general form for the state observers is analysed and the exponential observability of bioprocesses ... -
Robust Control Methods for a Recycle Bioreactor
("Dunarea de Jos" University of Galati, 2001)The paper presents a robust control design strategy for bioprocesses, which are characterized by strongly nonlinear dynamics. More precisely, we present the H2 methodology in order to compute the controller for a recycle ... -
Modelling Non-Stationary Wind Speed for Renewablwe Energy Systems Control
("Dunarea de Jos" University of Galati, 2001)This paper deals with the modelling of the wind speed, treated as a nonstationary process. In the proposed modelling methods, the wind speed has two components: a long and medium term-component, described by an available ...
