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Now showing items 21-40 of 3142

    • Modelling Non-Stationary Wind Speed for Renewablwe Energy Systems Control 

      Nichita, Cristian; Luca, Daniel; Dakyo, B.; Ceangă, Emil; Cutululis, Nicolaos Antonio ("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 ...

    • Robust Control Methods for a Recycle Bioreactor 

      Ionete, Cosmin; Petre, Emil; Selişteanu, Dan ("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 ...

    • Stability criteria for cellular neural networks 

      Danciu, Daniela; Răsvan, Vladimir ("Dunarea de Jos" University of Galati, 2001)
      A cellular neural network is an artificial neural network which features a multidimensional array of neurons and local interconnections among the cells. Neural networks are systems with several equilibrium states. It is ...

    • Analysis of a Neuro-Fuzzy Approach of Air Pollution: Building a Case Study 

      Neagu, Ciprian-Daniel; Neagu, Daniela; Georgescu, Lucian; Palade, Vasile ('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 

      Turtoi, Maria; Hopulele, Traian; Caraman, Sergiu ("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 ...

    • On Activity Modelling in Process Modelling 

      Aiordăchioaie, Dorel ("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 

      Oltean, Virginia Ecaterina; Cârstoiu, Dorian ("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 ...

    • Integrating Hypermedia Objects in an Tutoring System 

      Pecheanu, Emilia; Ştefănescu, Diana; Sabin Corneliu, Buraga; Istrate, Adrian ("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 ...

    • On Exponential and Asymptotic Estimation of State Variables in Bioprocesses 

      Selişteanu, Dan; Ionete, Cosmin; Petre, Emil ("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 ...

    • Supervisory Control Technique for an Assembly Workstation as a Dynamic Discrete Event System 

      Cernega, Daniela Cristina; Mînzu, Viorel ("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 ...

    • Software System for Generating, Identification and Simulation of the Biotechnological Processes Models 

      Caraman, Sergiu; Frangu, Laurenţiu; Turtoi, Maria ("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 ...

    • Influence of Geometrical Parameters on Rigidity of the Worm-Gearing Tooth 

      Ghelase, Daniela; Daschievici, Luiza; Hauk, Niculai (Universitatea "Dunărea de Jos" din Galați, 2002)
      By means of an original numerical method, the authors study the influence of the parameters of the worm-gearing tooth (diametral quotient, radius of profile curvature, profile angle of the worm, number of gear teeth) on ...

    • A Method for Establishing by Controlled Aproximation of the Limitted Forces Developed by Alignmed of the Hydraulic Cylinder 

      Hauk, Niculai; Goanță, Adrian Mihai; Ghelase, Daniela (Universitatea "Dunărea de Jos" din Galați, 2002)
      Determination of the limited forces – in case of the mechanisms actioned by the alignmed of the hydraulic cylinders is a very difficult problem to be realized very exactly. This paper presents a numerical method with a ...

    • Controlled Parameter Modelling of Casting Pieces Bushing Type 

      Goanță, Adrian Mihai; Hauk, Niculai; Rădulescu, Cătălin (Universitatea "Dunărea de Jos" din Galați, 2002)
      The workpaper proposes a computer assisted modality of projection in order to obtain casting semiforms, starting from the 3D totally standardized model of the casting piece. The advantage of such a method is that the ...

    • The consolidation Equipment Work Devices Vibrations Frequency Influence about the Railway Stabilization Process 

      Gaidoș, Aurelian (Universitatea "Dunărea de Jos" din Galați, 2002)
      In this work presented the experimental research realized on the stand in the laboratory. The experimental researches have as the goal the study of the influence the frequency vibration of the work device concerning the ...

    • Structural Requirements of Bituminous Paving Mixtures 

      Bordea, Carmen; Năstac, Silviu (Universitatea "Dunărea de Jos" din Galați, 2002)
      In this work, the autors present some of the principal issues and challenges associated with the design and production of bituminous mixtures that can meet the ever-increasing structural needs of modern pavements.

    • The Dynamic Study of the Crane "MT-40" in the Process of Gyrations 

      Anghelache, Diana (Universitatea "Dunărea de Jos" din Galați, 2002)
      This work proposes the determination of the dynamic behavior of a tower crane in the process of gyration in sight of a move burdens in the most disadvantageous conditions and namely: in the crane’ s hook it is a solid body ...

    • The Analysis of the Dynamic Response of the Hydrostatic Driving Systems in a Closed Circuit 

      Gavril, Axinti; Năstac, Silviu; Axinti, Adrian-Sorin; Potârniche, Aurora (Universitatea "Dunărea de Jos" din Galați, 2002)
      The hydrostatic actions in a closed circuit were remarked in the action of the technological equipment both for achievement of translation motions with linear hydrostatic engines with bilateral stem and for rotational ...

    • Mathematical Model for Frequency-Dependent soil Propagation Analysis 

      Cauteș, Gheorghe; Năstac, Silviu (Universitatea "Dunărea de Jos" din Galați, 2002)
      Vibration analyses of advanced technology facilities typically must consider frequency as well as amplitude of vibration. A soil propagation model is proposed which will allow the use of site-specific, measurable, frequency ...

    • Phisycal and Mathematical Model Forvibratory Driving Process Analysis 

      Cauteș, Gheorghe; Năstac, Silviu (Universitatea "Dunărea de jos" din Galați, 2002)
      Vibratory driving of pile is one of the technologies used for powerless basement soil deep consolidation. This process consist by favouring the pile penetration in soil, whereupon when vibrations using. Experimentally, was ...