Search results for "Oriente"
showing 10 items of 684 documents
Graduate of Riga Polytechnic Institute, Engineer, Inventor and Athlete Arno Līcis
2019
The article summarizes the career of a graduate of the Faculty of Mechanics (1964) of Riga Polytechnic Institute Arno Līcis. The article reveals and describes his work while being an engineer at the Riga Electromachine Building Factory (RER), at the Latvian Scientific Research Institute of Trauma- tology and Orthopaedics (LSRITO) and in the printing house «Jāņa sēta», as well as being an inventor. It has been discovered that he had promoted orienteering sports and had significant achievements in competitions of various scale, inclu- ding mass competition named «Magnēts» managed by him, which had been taking place since 1969. This is the first research on the life and professional activities…
An Object-Oriented Approach to Discrete-Event Simulation Applied to Underground Railway Systems
1999
This paper describes the implementation of an object-oriented simulator that supports the determination of timetables and the design of on-line control policies for underground rail way systems. The simulator has been developed on the basis of a new approach to object- oriented modelling. Such an approach has been used to design a development tool that supports the generation of simulation codes and is able to automatically define the skeleton of a code.
Promotion of polygeneration for buildings applications through sector- and user-oriented “high efficiency CHP” eligibility criteria
2014
Abstract The eligibility criteria adopted to assess polygeneration plants as “highly efficient” can play a determinant role in favouring or discouraging the market growth of polygeneration systems, especially for buildings applications where economic viability is often more difficult to achieve. Based on the current European framework, in this paper the opportunity to adopt sector- and user-oriented criteria is discussed. After having identified three buildings with different uses (a large hotel, a hospital and an office building), the optimal lay-out and operation strategy of a polygeneration plant serving each building is determined; then, ex-post processing of economic and energetic resu…
Urban Orienteering Competitions – A Unique Activity of Didactic Communication
2014
Abstract The aim of our project was to deepen understanding of the legacy of our predecessors, which are to be found in the historical centre of Sibiu, to develop map reading skills using the techniques and rules of orienteering. Most students participated enthusiastically in the search for historical sights and found the activity extremely attractive. Moreover, both the preparation stage, when the students learnt all together or in groups how to use a map in order to locate the historical sights, and the follow-up stage, when they disseminated the results, contributed to developing team spirit and a sense of belonging. Communication among students and with the form teacher also improved an…
CHANGES OCCURRED IN A PORCELAIN FACTORY DUE TO QUALITY MANAGEMENT SYSTEM IMPLEMENTATION
2019
The issues approach in this research show the benefits of the implementation of ISO 9001 standard in different companies as well as the importance of certain criteria with respect to customer satisfaction and confidence. This standard specifies requirements for a quality management system and it is based on a number of quality management principles including a strong customer focus, the motivation and implication of top management, the process approach and continual improvement. The criteria taken into account help to improve the quality management system of the organization. The purpose of this paper is to identify the changes due to the implementation of a quality management system based …
Using and Extending the SPEM Specifications to Represent Agent Oriented Methodologies
2009
Situational Method Engineering used for constructing ad-hoc agent oriented design processes is grounded on a well defined set of phases that are principally based on reuse of components coming from existing agent design processes; these components have to be stored in a repository. The identification and extraction of these components could take large advantages from the existence of a standardized representation of the design processes they come from. In this paper we illustrate our solution based on SPEM 2.0 specifications for modelling agent design processes and extending them when necessary to meet the specific needs we faced in our experiments.
Sliding mode torque control of an induction motor for automotive application with sliding mode flux observer
2016
In this paper, the performance of two control systems of induction motors for automotive applications were compared in order to highlight the differences in terms of response speed, robustness and noise immunity. The first system is realized through a field-oriented control with PI controllers, while the second system is realized through a field-oriented control with Sliding Mode Controllers. Both controls are designed to follow the torque references as required for the vehicles and are tested with typical load profiles of vehicles. It also designed a sliding mode observer flux.
NB PLC and Software Defined Networking for Smart Grid Applications
2017
During the last years, the installation of Distributed Energy Resources (DERs) and the expected diffusion of Electrical Vehicles (EVs), is increasing the complexity of the distribution grid, making the management of the grid operated by Distribution System Operators (DSOs) more difficult. The Smart Grid approach tries to provide a response to these troubles, by means of a strong interaction between the power grid and Information and Communication Technology (ICT) infrastructures. The drawback of this approach is an increase in the management effort of the ICT infrastructures, for which the DSO are not prepared. Software Defined Networking (SDN) is an approach developed to manage complex ICT…
Guidelines for the design and implementation of the ARPCC control applied to grid-connected converters
2013
Abstract This paper presents implementation details of the adaptive robust predictive current control (ARPCC) applied to a grid-connected converter, such as feed-forward cancellation protocol, the selection of the observer gain and adaptive parameters or the sampling options, needed to get the best performance of this control. The feed-forward term cancellation permits to achieve a very low harmonic distortion in current waveforms when the voltage sensing circuits are well calibrated. A detailed gain adjustment protocol of the voltage sensing circuits is presented in this paper. Moreover, a control design procedure based on the observer gain L o boundaries and the adaptive parameters has be…
Vibration signature analysis for rotor broken bar diagnosis in double cage induction motor drives
2013
The paper investigates the diagnosis of rotor broken bars in field oriented controlled (FOC) double cage induction motor drives, using current and vibration signature analysis techniques. The Impact of the closed loop control system cannot be neglected when the detection of asymmetries in the machine are based on the signature analysis of electrical variables. The proposed diagnosis approach is based on optimized use of wavelet analysis by a pre-processing of phase current or axial/radial vibration signals. Thus, the time evolution of the tracked rotor fault components can be effectively analyzed. This paper shows also the relevance of the fault components computed from axial vibration sign…