Widespread across Europe, the noble crayfish Astacus astacus has experienced many negative ecological and anthropogenic influences, mostly in western and northern Europe. We address the distribution and ecological affinities of this species in the geographical context of the Carpathian Danube basin, an area where these influences were limited and the… (More)
This paper presents a new control method for the Three-level Active Neutral Point Clamped (ANPC) converter. The advantages of this method are presented and a power loss analysis is made for an extreme modulation index. The results obtained are compared whit those obtained for two other control methods. Simulation and experimental results are presented in… (More)
It presents a comparative study between several ac-dc structures with three voltage levels. Also there are presented simulation results and theoretical analysis regarding the performances and power losses in the power devices. It is shown a new rectifier structure with three voltage levels derived from the bidirectional converter 3L-ASNPC.
This review summarises the main ecotonal properties of chalk hyporheic zone (CHZ), using a holistic approach on both structure and functionality of this habitat. The corroborated results suggest that the CHZ represents a typically shallow habitat (approx. 40–50 cm deep), with a homogenous distribution of both fauna and chemistry between heads and tails of… (More)
This paper presents an analysis and simulation of a Wind Turbine Generator (WTG) driving a low speed Permanent Magnet Synchronous Generator (PMSG). The results of the tests are obtained by using the PSIM computer simulation program. The voltage source PWM inverter is used to interface the system with the electrical utility that is simulated in this paper as… (More)