2021 (vol. 31) - Number 1

*J.C. Arceo, C. Armenta, J. Lauber, E. Simoneau-Buessinger, J. Álvarez, M. Bernal:*

Novel solutions on model-based and model-free robotic-assisted ankle rehabilitation

*B. Sikora, N. Matlok:*

On controllability of fractional positive continuous-time linear systems with delay

*P.N. Rao, R. Devarapalli, F.P. García Márquez, G.V. Nagesh Kumar, B. Mohammadi-Ivatloo:*

Indirect torque observer-based sensor-less efficient control of bearingless switched reluctance motor using global sliding mode and square currents control method

*A. Czornik, M. Niezabitowski, E. Makarov, S. Popova:*

Sufficient conditions for uniform global asymptotic stabilization of affine discrete-time systems with periodic coefficients

*S. Vaidyanathan, S. He, A. Sambas:*

A new multistable double-scroll 4-D hyperchaotic system with no equilibrium point, its bifurcation analysis, synchronization and circuit design

*T.Kwater, P. Hawro, J. Bartman, D. Mazur:*

The algorithm of adaptive determination of amplification of the PD filter estimating object state on the basis of signal measurable on-line

*D. Casagrande, U. Viaro, W. Krajewski:*

The Lepschy stability test and its application to fractional-order systems

*A.Zh. Khurshudyan, J. Klamka:*

Approximate controllability of second order infinite dimensional systems

*A. Dymarek, T. Dzitkowski:*

The use of synthesis methods in position optimisation and selection of tuned mass damper (TMD) parameters for systems with many degrees of freedom

*A. Sarkar, A. Biswas:*

Interval-valued dual hesitant fuzzy prioritized aggregation operators based on Archimedean t-conorm and t-norm and their applications to multi-criteria decision making

Each paper submitted is subject to a review procedure, and the publication decision is based on reviers' comments on the paper. Highly specialized reviewers are selected by members of the Editorial Board.

To avoid delay, please prepare the manuscript carefully following the suggestions listed below.

**Computer file**of the manuscript may be sent by e-mail to the address of Assistant Editor or acs@polsl.pl. Preferred text processors is TeX or LaTeX, however Word and other processors are also acceptable. In case of difficulties in processing the text, the author may be asked to supply the ASCII export of the original file.

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**References**should be listed alphabetically at the end of the manuscript. They should be numbered in ascending order and the numbers should be inserted in square brackets. References should be organized as follows. First initial(s), surname(s) of the author(s) and title of article or book. Then, for papers: title of periodical or collective work, volume number (year of issue), issue number, and numbers of the first and the last page; for books: publisher's name(s), place and year of issue. Add a DOI link in case the publication has one. Example:

[1] F. Conte, V. Cusimano and A. Germani: A separation theorem for a class of MIMO discrete-time nonlinear systems.

*2012 IEEE 51st IEEE Conference on Decision and Control (CDC)*, (2012), DOI: 10.1109/cdc.2012.6426715

[2] R.E. Kalman: Mathematical description of linear dynamical system.

*SIAM J. Control.*

**1**(2), (1963), 152-192.

[3] F.C. Shweppe:

*Uncertain Dynamic Systems.*Prentice-Hall, Englewood Cliffs, N.J. 1970.

Please, give full titles of journals; only common words like Journal, Proceedings, Conference, etc. may be abbreviated ( to J., Proc., Conf., ... respectively). References to publications in the body of the manuscript should be indicated by the numbers of the adequate references in square brackets. When the paper is set in TeX the preferable form of preparing references is Bib TeX bib database.

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**List of symbols**containing definitions of all symbols used, enclosed to the manuscript on a separate sheet, is required when the paper is not set in TeX and welcome in other cases.

**Submission of a paper**implies the Author's irrevocable and exclusive authorization of the publisher to collect any sums or considerations for copying or reproduction payable by third parties.

Papers should be sent to (email is preferred):

Zbigniew Ogonowski

Institute of Automatic Control

Silesian University of Technology

Akademicka 16

44-101 Gliwice, Poland

acs at polsl.pl