Annals of „Constantin Brâncuşi” University of Târgu Jiu ENGINEERING SERIES

4

Authors: Vilan Constantin Cristinel, Nebunu Daniela Lavinia, Cozma Vasile

The paper presents the differential equations which represent the mathematical model of the asynchronous machine in the u,v,0 axis system, and the simulation in the Simulink – Matlab, implemented basis of these equations. The asynchronous machine been very used in industry, the mathematical modeling is extremely helpful because allow solving many problems existing in this moment.

4

Authors: CĂPĂŢÎNĂ Camelia, ŞCHIOPU Emil Cătălin

The controlled storing is the main waste treatment channel at the world scale. In view of ascertaining the water quality, there were drawn two water samples from the river Jiu, and the quality indicators were determined according to the STAS in force. The results obtained are compared with the maximum values allowable according both to NTPA 001/2002 and Order 1146/2202, and the water of the river Jiu from the vicinity of the domestic waste storehouse integrates within the second class quality for almost all the indicators except NO2 -, Cu, PO4 3-, that through the values determined are included in the third class quality.

4

Authors: Alina Dinca, Constantin Cercel, Nicolae Antonie

In this paper, the authors wish to underline how can the environment benefit from the detection of the hot spots in the lignite deposits from the mining pits. The detection can be made with a thermovision camera. Also, there are presented some results of the application.

6

Authors: Mădălina Roxana Buneci

Newton method is a root-finding algorithm that can often converge remarkably quickly, especially if the iteration begins "sufficiently near" the desired root. However, if the initial value is too far from a root, Newton's method can fail to converge. The purpose of this paper is to provide several Maple procedures for visualize the behavior of a given set of points used as starting points in Newton method.

6

Authors: Octavian Dogaru

In this paper we propose calculate and compare the calculation times and memory spaces to determine the value of interpolation polynomial in a point a that differs from the interpolation points of the follow methods of function interpolations: Lagrange’ method, Aitken’s technics and the Newton’s method. In general Aitken’s technics is light more quickly than Lagrange and Newton formulas. Lagrange method uses the fewest space of memory then Aitken’ s technics and then Newton’s method.

6

Authors: Adrian Runceanu, Marian Popescu, Mihaela Runceanu

Designing databases in a distributed environment is significantly more complex than designing databases in a centralized environment, largely because of the need to consider network sources, data partitions schemes, redundant data placement alternatives, an replication approaches. In this paper we present two alternatives design for database partitioning at both primary and replicate locations.

6

Authors: G. Metaxas, G. Karantounias

This paper reports the results of the use of IKONOS-2 high resolution data to estimate the irrigation needs of crops cultivated in the hydrological basin of Pinios River at Elia, North West part of Peloponnesus, Greece. IKONOS-2 psm data generated high resolution products such as crop thematic maps depicting the crop areas with a considerable accuracy of ± 2 meters. The estimation of the water needs for each crop type was based on the extraction of the different crop and its area. However, the need of a multi-temporal data set is needed to estimate the water need during the phonological cycle of each crop type.

6

Authors: Patrik Böhm, Gabriela Böhmová, Jana Gazdíková

Average income of employees is usually determined by mean. Since the distribution of income is not symmetric, mean is not appropriate for this particular distribution. In our paper we deal with other characteristics like median, median-mean ratio and quintile ratio. We show that there is a strong correlation between these characteristics.

8

Authors: Constantin Cercel, Florin Grofu, Adrian Runceanu

Always wanted to find solutions to act in dangerous areas, hardly accessible, where human intervention is difficult or even impossible because of existing dangers. Thus, with the help of robotics systems auto ordered or ordered from a distance will avoid such problems, should not direct human action. Such systems can avoid obstacles, sinks, it orientation is based on each situation occur again to reach the destination set.

10

Authors: Stefan Dimovski, Radi Radichev, Emil Hristov

Electrical tomography surveying can be successfully applied for the detailed study of the nearsurface geological section. The approach and the basic elements of the methodology for data acquisition, processing and interpretation are revealed on the example of the performed electrical tomography surveying in the region of “Marichin valog” – a potential site for long-term storage of radioactive waste products. Field measurements are performed along 10 profiles. The distribution of the electrical resistivity along the profiles and the obtained zoning of the geoelectrical section are illustrated. Structural map of one well-distinguished geoelectrical boundary is achieved. The obtained results confirm the high geological efficiency of the electrical tomography surveying.