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Recent Submissions

Hot flame detection in a completely automated autoignition temperature measurement apparatus
(Elsevier, 2026) Kuna, Petr; Janovský, Břetislav; Spitzer, Stefan H; Zakel, Sabine
The auto-ignition temperature (AIT) is essential for assessing the hazard of flammable liquids in relation to hot surfaces. An international ISO/IEC standard describes the method and protocol of AIT measurement as well as ignition detection by the eye. It also allows automatic flame detection if the same results are obtained during apparatus verification. As the intensity, temperature and color of the flame phenomenon can depend on the substance class and quantity, the question arises as to how reliably ignitions can be detected when additional sensor parameters affect the detection signal. This particularly applies to substances that tend to produce cold flames. The standard does not give detailed guidelines on sensor types and the given flame detection parameters seem questionable. Nevertheless, there are AIT test rigs available, which use semi-automated flame detection, but the criteria are set by the manufacturers. This study focuses on developing a largely automated apparatus for AIT measurements. This includes temperature control, dosing of the liquid and cleaning of the flask. Specific emphasis lays on hot flame detection during an ignition test in the first step. Future work will be related to cool flames. This paper aims to specify the sensors used, their positioning, and the flame detection parameters to enable nearly unsupervised operation of the apparatus. New recommendations for hot flame detection are provided. Both VIS/NIR and UV photodiodes are used successfully for hot flame detection. Thermocouple measurements based on the rate of temperature rise were found to be reliable, when Delta T/Delta t > 80 degrees C/s.
Experimental study of multiple-shot unitary channels discrimination using the IBM Q computers
(Springer Nature, 2026) Bílek, Adam; Hlisnikovský, Jan; Bezděk, Tomáš; Kukulski, Ryszard; Lewandowska, Paulin
Tasks involving black boxes appear frequently in the theory of quantum information, with quantum channel discrimination as a central example that has been deeply studied. In this work, we experimentally study the discrimination between two unitary quantum channels in the multiple-shot scenario. We challenge the theoretical results concerning the probability of correct discrimination with the results collected from experiments performed on the IBM Brisbane. Our analysis shows that neither too deep quantum circuits nor circuits that create too much entanglement are suitable for the discrimination task. We conclude that circuit architectures which minimize entanglement overhead while preserving discrimination power are significantly more resilient to hardware noise if their depth does not exceed a threshold value. Consequently, our findings necessitate a paradigm shift: for execution on noisy hardware, the theoretically suboptimal circuit is, counterintuitively, often the superior choice.
Application of CSA algorithm for the PMSM speed estimator of the FOC control method using extended Kalman filter
(Vysoká škola báňská - Technická univerzita Ostrava, 2025) Tran, Thinh Cong; Brandštetter, Pavel; Tan, Huynh; Vo, Hau Huu
Nowadays, Permanent Magnet Synchronous Motors (PMSM) are used more and more widely due to their advantages over other types of motors, such as high efficiency, constant torque, higher power density, and wide speed range. Many studies on this motor have been carried out in the industry. This paper proposes an application for the PMSM motor to estimate the speed of the motor rotor using an extended Kalman filter (EKF). This also means that the motor is controlled without using a speed sensor, so the system has the advantages of reducing the cost of manufacturing encoders, less damage, increased reliability, and reduced size due to the absence of moving mechanical parts of the sensor. The estimated performance depends heavily on the parameters of the covariance matrices in the filter. In the paper, the filter parameters are optimized using the Cuckoo Search Algorithm (CSA). The simulation results of the proposed algorithm on the PMSM motor show its advantages over traditional methods.
A hybrid meshless collocation approach for capturing solution and gradient jumps in 1D telegraph double-interface model with highly discontinuous coefficients
(Elsevier, 2026) Asif, Muhammad; Fatima, Ali; Riaz, Muhammad Bilal; Bilal, Faisal
Telegraph interface models accurately predict signal and wave behavior in layered media with multiple boundaries, providing a reliable basis for the design and analysis of electrical, communication, and geophysical systems. This article presents a numerical method for solving the one-dimensional telegraph equation with double interface conditions. The proposed scheme combines radial basis functions for spatial discretization with finite difference approximations in time, forming a unified and flexible computational framework. This hybrid approach is capable of handling both linear and nonlinear problems and can accommodate constant as well as variable coefficients. Linear algebraic systems arising from the discretization are solved using Gaussian elimination, while nonlinear problems are treated through a quasi-Newton linearization technique. The accuracy and efficiency of the method are evaluated by computing the maximum absolute error and the root mean square error for different spatial grid sizes and time step values. Numerical results confirm that the proposed scheme is easy to implement, exhibits fast convergence, and achieves high accuracy across a range of test problems. Therefore, the method provides a reliable and efficient computational tool for solving telegraph equations with interface discontinuities.
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(Ústřední knihovna Vysoké školy báňské – Technické univerzity Ostrava, 2026) Mučka, Aleš; Ulmannová, Zuzana