Search results for "Energy engineering"
showing 10 items of 1099 documents
Frequency dynamics of power systems with temporally distributed disturbances
2021
Abstract The frequency dynamics and stability of power systems is essentially affected by nature and characteristics of the disturbances occurring in the system. Conventionally, frequency transients are examined assuming a single disturbance applied at a given time. However, actual incidents in the power systems can be generally composed of a temporal sequence of events, and thus characterized by multiple power imbalances of different magnitudes and time offsets. The consideration of the effects of the temporal distribution of power imbalances is important for two main reasons: the impact on the frequency dynamics of the system in terms of frequency metrics such as minimum instantaneous fre…
Ongoing Economic Restructuring in the Wake of the Latest Economic Crisis: A Russian Perspective
2013
Abstract The latest economic crisis has brought into focus long-standing discussions regarding the role played by services in contemporary economies. Whether viewed as a support for the well-established manufacturing sector, or growth engine in its own right, the third economic sector has become a focus point for policy makers worldwide. The paper follows the effects of the crisis on the tertiarization process, with an emphasis on developing economies, where this phenomenon is barely coming of age. The research is centered on the IT market, as this is seen as a comprehensive measure of the maturity and sophistication of the services sector.
Absorption of Structural Funds – International Comparisons and Correlations
2013
Abstract Structural Funds represent one of the main instruments which The European Union uses to sustain regional development and to eliminate disparities between members. Specialized literature is relatively poor when it comes to approaching this subject. In the period 2002-2006, several papers were written, which identified the absorption process's influence factors, but all these materials represented ex-ante analysis, the empirical testing of theories being virtually impossible. The present paper, based on available statistical data related to the absorption process, aims at testing these factors, trying to elucidate the great differences obtained by the EU members within Central and Ea…
Global Strategy: The Case of Nissan Motor Company
2013
Abstract The concept of global strategy has become prominent in the international business and management literature in the 1980s. The aims of our paper are to render in brief the concept of global strategy and to highlight some of the main features of Nissan's strategy. Our paper contributes to a better understanding of the global strategy concept, and its designing and implementation in the business corporate world. Further studies can be carried on in emphasizing the role played by global strategies in achieving high performance in a changing environment.
An Efficient Numerical Method for Time Domain Computational Electromagnetic Simulation
2018
In this paper an efficient numerical method in approximating the electric and magnetic fields is provided. The method is based on an implicit leapfrog arrangement in time and without mesh in space. Moreover, a projection scheme is introduced in order to improve the accuracy of the proposed approach and applied into the computational electromagnetic (CEM) framework. The PDEs governing the process are solved and some numerical results are reported to validate the numerical process.
Critical assessment of support for the evolution of photovoltaics and feed-in tariff(s) in Italy
2015
Abstract The feed-in tariff(s) mechanism involves an obligation on the part of an electricity provider to purchase electricity generated by renewable energy sources in its relevant area, paying a tariff determined by public authorities and guaranteed for a specific time period. Feed-in tariff(s) have been the primary mechanism used for supporting the development of renewable energy sources in the EU and, up to date, they are being applied in 20 EU Member Countries. On 6 July 2013, the Italian experience with feed-in tariff(s) for photovoltaic systems finished. During its lifetime of eight years, this incentive mechanism, named “Conto Energia”, was characterized by periods of great success f…
The Speed of Incorporating Information into Prices
2013
Abstract To determine the speed of adjusting asset prices to the latest market information, investors usually resort to semi-strong form efficiency tests. Semi-strong form efficiency is based on the assumption that stock prices adjust rapidly as a result of new public information. The objective of the event study conducted in this paper was to examine whether new information is incorporated into the share price in a single price change after its public distribution. We analyzed the price behaviour of companies listed under Category I of the Bucharest Stock Exchange around events such interim result announcements between June and November 2012.
Study and simulation of photovoltaic installation connected to the grid with storage system
2016
In the present paper, a new approach to the management of energy resources in a research laboratory is proposed and evaluated by a simulation for the PV installation realized for the Tunisian-Italian cooperation project DE.DU.ENER.T, using renewable energy and economic criteria. The aim of this project is to improve energy efficiency order to minimize the electricity cost consumed at the laboratory, because according to the bills of electricity received we noticed that there is a high consumption of electrical current, from the STEG grid, and especially by the energy intensive equipment such as drying ovens and all the workstations. So we targeted to install a photovoltaic field of 12KWc to…
ROS/Gazebo-Based Simulation of Quadcopter Aircrafts
2018
The main purpose of this work is to present a tutorial description on how to design and develop an observer, which is capable of estimating the position and the orientation of a drone commanded by a controller, whose shape and structure are unknown. Starting from Newton's and Euler's laws, a mathematical model describing the dynamics of a quadcopter has first been obtained. By linearizing this model it is possible to implement a Luenberger observer and validate it with simulations in a Linux environment, thanks to the use of the Ardupilot controller and the Gazebo simulator. Finally, starting from the results obtained from the simulation, it is possible to evaluate the error made in the est…
Quality Indicators in Reference to the Evaluation of the Quality Management of Services in Local Public Administration
2014
Abstract The paper proposes to show evidence in measures of quality through quantification of the level of current performance of an organization, like local public administration, in accordance with performance standards. The evaluation of quality measures the difference between the expected performance and the actual performance, to identify and improve the quality of the local public administration. Standards of performance could be set for different dimensions of quality. For example: the quality of managing documents, the products, processes and services requires the gathering and analysis of information, set in measuring terms. In a few cases the measuring of quality as percentage of …