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Zielona Gora, Poland

The University of Zielona Góra was founded on 1 September 2001 as a result of a merger between Zielona Góra's Pedagogical University, which was founded in 1971 and Technical University, which was founded in 1965. It is one of the youngest universities in Poland. Main buildings are located in two campuses: "A" on Podgórna street and "B" on Wojska Polskiego street. The President's office is located near the Old Town on Licealna street. Wikipedia.

Malinowski M.T.,University of Zielona Gora
Information Sciences

We consider stochastic fuzzy differential equations driven by m-dimensional Brownian motion. Such equations can be useful in modeling of hybrid dynamic systems, where the phenomena are subjected to two kinds of uncertainties: randomness and fuzziness, simultaneously. Under a boundedness condition, which is weaker than linear growth condition, and the Lipschitz condition we obtain existence and uniqueness of solution to stochastic fuzzy differential equations. Solutions, which are fuzzy stochastic processes, and their uniqueness are considered to be in a strong sense. An estimation of error of the Picard approximate solution is established. We give a boundedness type result for the solution defined on finite time interval. Also the stabilities of solution on initial condition and coefficients of the equation are shown. The existence and uniqueness of a solution defined on infinite time interval is proven. Finally, some applications of fuzzy stochastic differential equations are considered. All the results presented in this paper apply to set-valued stochastic differential equations. © 2012 Published by Elsevier Inc. Source

Urbanowski K.,University of Zielona Gora
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

Late time properties of moving relativistic particles are studied. Within the proper relativistic treatment of the problem we find decay curves of such particles and we show that late time deviations of the survival probability of these particles from the exponential form of the decay law, that is the transition times region between exponential and non-exponential form of the survival amplitude, occur much earlier than it follows from the classical standard approach boiled down to replace time t by t/γL (where γL is the relativistic Lorentz factor) in the formula for the survival probability. The consequence is that fluctuations of the corresponding decay curves can appear much earlier and much more unstable particles have a chance to survive up to these times or later. It is also shown that fluctuations of the instantaneous energy of the moving unstable particles have a similar form as the fluctuations in the particle rest frame but they are seen by the observer in his rest system much earlier than one could expect replacing t by t/γL in the corresponding expressions for this energy and that the amplitude of these fluctuations can be even larger than it follows from the standard approach. All these effects seem to be important when interpreting some accelerator experiments with high energy unstable particles and the like (possible connections of these effects with GSI anomaly are analyzed) and some results of astrophysical observations. © 2014 The Author. Source

Mrugalski M.,University of Zielona Gora
International Journal of Applied Mathematics and Computer Science

This paper presents an identification method of dynamic systems based on a group method of data handling approach. In particular, a new structure of the dynamic multi-input multi-output neuron in a state-space representation is proposed. Moreover, a new training algorithm of the neural network based on the unscented Kalman filter is presented. The final part of the work contains an illustrative example regarding the application of the proposed approach to robust fault detection of a tunnel furnace. Source

Piwowar A.,Wroclaw University of Economics | Dzikuc M.,University of Zielona Gora
Renewable and Sustainable Energy Reviews

The paper presents the economic and technical problems associated with the use of biomass in co-combustion processes in the energy sector in Poland. The particular attention was paid to the extent of the use of biomass in the energy sector, the technologies and techniques applied, as well as the economic determinants. As it results from the analyses, the co-combustion of biomass in Poland is a predominant direction in the "green" energy production. Co-combustion processes are carried out mainly with the use of direct combustion technologies in the largest entities operating in the energy market. The widespread use of biomass in the Polish energy sector results in specific problems, such as those associated with the prices of green certificates and the import of biomass. Currently, the Polish renewable energy sector is developing as intended. However, the validity of the funds spending, which aimed at supporting renewable energy sources (RES), may raise some doubts. This results from insufficient monitoring of the amount of energy produced on the basis of renewable sources, which in 2012 led to over-production of the RES-based energy and, consequently, to a significant decrease in prices of green certificates. © 2015 Elsevier Ltd. Source

Galicki M.,University of Zielona Gora

This work offers the solution at the control feed-back level of the accurate trajectory tracking subject to finite-time convergence. Dynamic equations of a rigid robotic manipulator are assumed to be uncertain. Moreover, globally unbounded disturbances are allowed to act on the manipulator when tracking the trajectory. Based on the suitably defined non-singular terminal sliding vector variable and the Lyapunov stability theory, we propose a class of absolutely continuous robust controllers which seem to be effective in counteracting both uncertain dynamics and unbounded disturbances. The numerical simulation results carried out for a robotic manipulator consisting of two revolute kinematic pairs operating in a two-dimensional joint space illustrate performance of the proposed controllers. © 2014 Elsevier Ltd. All rights reserved. Source

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