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13 results on '"Glowacki, Jakub"'

1. ARChemist: Autonomous Robotic Chemistry System Architecture

Author

Fakhruldeen, Hatem, Pizzuto, Gabriella, Glowacki, Jakub, and Cooper, Andrew Ian

Subjects
Computer Science - Robotics
Abstract

Automated laboratory experiments have the potential to propel new discoveries, while increasing reproducibility and improving scientists' safety when handling dangerous materials. However, many automated laboratory workflows have not fully leveraged the remarkable advancements in robotics and digital lab equipment. As a result, most robotic systems used in the labs are programmed specifically for a single experiment, often relying on proprietary architectures or using unconventional hardware. In this work, we tackle this problem by proposing a novel robotic system architecture specifically designed with and for chemists, which allows the scientist to easily reconfigure their setup for new experiments. Specifically, the system's strength is its ability to combine together heterogeneous robotic platforms with standard laboratory equipment to create different experimental setups. Finally, we show how the architecture can be used for specific laboratory experiments through case studies such as solubility screening and crystallisation., Comment: 7 pages, 5 figures, accepted for presentation at 2022 International Conference on Robotics and Automation (ICRA2022)

Published
2022

6. Numerical Simulation on AC Loss in REBCO Stacks and Coils Carrying Non-Sinusoidal Currents

Author

Uejima, Katsuya, Sun, Yueming, Miyagi, Daisuke, Glowacki, Jakub, Long, Nicholas J., and Jiang, Zhenan

Abstract

AC loss is a critical issue for high-temperature superconducting (HTS) applications. Earlier studies have focused on ac loss in HTS conductors carrying sinusoidal currents. However, HTS conductors in some applications carry non-sinusoidal currents, and hence it is essential to study ac loss under those conditions. This study presents simulated ac loss of a REBCO stack and coil winding carrying currents with square, trapezoidal, and triangular waveforms. The simulation method is based on the T-A formulation implemented in COMSOL Multiphysics 6.0. AC loss dependence on frequency and n-value is also investigated. The simulation results show ac loss varies with current waveforms for both the stack and coil winding—loss magnitude is largest under square waveform, followed by trapezoidal, sinusoidal, and triangular waveform. Surprisingly, ac loss of the stack decreases with increasing frequency as f−2/n, while f−1/n for the coil winding. The difference between the ac loss values in the stack and coil winding under different current waveforms becomes smaller with increasing n-value. With an infinitely large n-value, the difference in the ac loss values for all different waveforms may disappear, as the critical state model suggests.

Published
2024
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9. A review of low-power applied-field magnetoplasmadynamic thruster research and the development of an improved performance model

Author

Balkenhohl, Jakob, Glowacki, Jakub, Rattenbury, Nicholas, and Cater, John

Subjects
Uncategorized
Abstract

Numerous thrust and voltage models for applied-field magnetoplasmadynamic thrusters (AF-MPDTs) exist, however, all have been formulated using data for conventionally high current AF-MPDTs. To address a perceived gap in knowledge about smaller thrusters, a review of low-power applied-field magnetoplasmadynamic thruster research and published thrust and voltage models is presented. Using available experimental data limited to a low-power high magnetic field strength regime, a database of pertinent physical and operational parameters is established and used in a comparative study to evaluate the accuracy of published performance models. Statistical analysis of the models was used to create a corrected low-power AF-MPDT performance model. When applied to the database, an improvement in model accuracy is achieved. It is found that AF-MPDTs in the low-power regime with high applied magnetic field strengths can present a feasible alternative to other electric propulsion methods. However, the resulting sensitivity of achievable performance to physical and operational parameters requires careful design and optimization for a given mission.

Published
2023

13. Mechanical and histomorphometrical evaluation of false and floating ribs of young adults with idiopathic scoliosis.

Author

Glowacki, Jakub, Tomanik, Magdalena, Pezowicz, Celina, and Krauss, Hanna

Subjects
*SCOLIOSIS, *BONE mechanics, *YOUNG'S modulus, *YOUNG adults
Abstract

Purpose: The aim of this paper was to assess the histomorphometrical and mechanical properties of ribs in patients with idiopathic scoliosis who underwent corrective surgery of scoliosis combined with thoracoplasty. Methods: The analyzed material encompasses 20 females between the ages of 12 and 18, whose pre-operative Cobb angle was 56.85 degrees on average. The participants were divided into two age groups, up to the age of 15 and above 15 years old, taking into account the anatomical location of the assessed rib fragments with a division into floating and false ribs. The analysis of mechanical parameters was carried out by means of the quasi-static 3-point bending test, and the histomorphometric evaluation of the examined rib fragments was carried out using high-resolution computed tomography. Results: The existence of explicit relationships between selected radiological parameters describing scoliosis and mechanical and histomorphometric parameters of the ribs has not been confirmed. Statistically significant correlations between age and rib stiffness, as well as between Young's modulus and stiffness depending on the anatomical location of the examined rib fragment, were confirmed. Conclusions: Mechanical and histomorphometric properties of bone tissue in patients with scoliosis are not explicitly associated with the radiological parameters characterizing scoliosis. [ABSTRACT FROM AUTHOR]

Published
2020
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