2018 (vol. 28) - Number 4

*T. Kaczorek:*

A new method for computation of positive realizations of fractional linear continuous-time systems

*A. Biswas, A. Sarkar:*

Development of dual hesitant fuzzy prioritized operators based on Einstein operations with their application to multi-criteria group decision making

*L. Li, R. Zhang, J. Wang, X. Shang:*

Some q-orthopair linguistic Heronian mean operators with their application to multi-attribute group decision making

*J. Duda:*

Lyapunov matrices approach to the parametric optimization of a system with two delays and a PD controller

*M. Lhous, M. Rachik, El M. Magri:*

Ideal observability for bilinear discrete-time systems with and without delays in observation

*P.T. Anh, A. Babiarz, A. Czornik, M. Niezabitowski:*

Variation of constant formulas for fractional difference equations

*K. Bingi, R. Ibrahim, M. Noh Karsiti, S. Miya Hassan, V. Rajah Harindran:*

A comparative study of 2DOF PID and 2DOF fractional order PID controllers on a class of unstable systems

ACS Abstract:

**2009 (Volume 19)**

Number 1

**Axial dispersion models and their basic properties**

D. Bartova, B. Jakes, J. Kukal(Institute of Chemical Technology, Prague, Czech Republic) |

Mathematical description of models including initial and boundary conditions, transfer function, model transient response to Dirac impulse as weighting (impulse) function, model transient response to step function as step response are included in this study. There are also included further characteristics of impulse function: raw moments up to 4th order, variance, variation coefficient, skewness , kurtosis, location and value of mode. Complete set of these characteristics for all studied models is collected (model-by-model) in seven tables.

The authors declare several properties of weighting function as key ones: value of 1st raw (dimensional) moment, parametric values and mode properties, related to dependence on Peclet number. The plots of parametric values and mode properties vs. Peclet number are mentioned in the paper for four studied axial dispersion models.

**keywords:** axial dispersion, flow models, basic properties, moments, mode

**Zeros and the output-zeroing problem in linear systems with time delay in control vector**

J. Tokarzewski(Warsaw University of Technology, Poland) |

**keywords:** linear systems with time delay in control vector, state-space methods, output-zeroing problem, invariant zeros

**Novel digital PWM strategies of multilevel voltage source inverters**

D. Beriber, A. Talha(University of Sciences and Technology Houari Boumediene, Algeria) | E. Berkouk, M. Boucherit(Ecole Nationale Polytechnique d'Alger, Algeria) | B. Francois(Ecole Centrale de Lille, France) |

**keywords:** multilevel NPC inverter, generating function, connection function, PWM strategies, algebraic modulation

**Differential evolution applied to parameter estimation of induction motor**

B. Subudhi, D. Jena(Department of Electrical Engineering, NIT, India) |

**keywords:** differential evolution, induction motor, parameter estimation

**Neural network parallel force/position control of robot manipulators under environment and robot dynamics uncertainties**

F. Ferguene, N, Achour, R. Toumi(LRPE, Faculty of Electronics and Computer Science, Algeria) |

**keywords:** force/position control, parallel control, PID control, neural network controllers, adaptive control, robot manipulators

**Experimental investigations of human-operator as a pressure force regulator in man-hand tool system**

Z. Basista, M. Ksiazkiewicz, J. Tarnowski(Cracow University of Technology, Poland) |

**keywords:** man-machine system, manual control, human-operator, hand-tool

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