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742 results on '"Kowalewski, Tomasz"'

2. Tuning the Molecular Weight Distribution from Atom Transfer Radical Polymerization Using Deep Reinforcement Learning

Author

Li, Haichen, Collins, Christopher R., Ribelli, Thomas G., Matyjaszewski, Krzysztof, Gordon, Geoffrey J., Kowalewski, Tomasz, and Yaron, David J.

Subjects
Physics - Chemical Physics
Abstract

We devise a novel technique to control the shape of polymer molecular weight distributions (MWDs) in atom transfer radical polymerization (ATRP). This technique makes use of recent advances in both simulation-based, model-free reinforcement learning (RL) and the numerical simulation of ATRP. A simulation of ATRP is built that allows an RL controller to add chemical reagents throughout the course of the reaction. The RL controller incorporates fully-connected and convolutional neural network architectures and bases its decision upon the current status of the ATRP reaction. The initial, untrained, controller leads to ending MWDs with large variability, allowing the RL algorithm to explore a large search space. When trained using an actor-critic algorithm, the RL controller is able to discover and optimize control policies that lead to a variety of target MWDs. The target MWDs include Gaussians of various width, and more diverse shapes such as bimodal distributions. The learned control policies are robust and transfer to similar but not identical ATRP reaction settings, even under the presence of simulated noise. We believe this work is a proof-of-concept for employing modern artificial intelligence techniques in the synthesis of new functional polymer materials., Comment: 18 pages, 14 figures, 2 tables

Published
2017
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6. Improving Bee Living Conditions through Ecological Thermal Insulation and Remote Early Anomaly Detection-Vital Step Towards Preserving Bees Population

Author

Górecki, Sebastian, Wrześniewska-Tosik, Krystyna, Mik, Tomasz, Kowalewski, Tomasz, Walisiak, Damian, Pałczyńska, Michalina, and Wesołowska, Ewa

Abstract

This publication underscores the vital role of bees, particularly their contribution to products like honey, pollen, and propolis, which offer significant health benefits. Notably, 79% of the world’s food supply relies on bees; thus, their declining numbers pose a threat to pollination and food security. The study explores an ecological thermal insulation for hives using animal biomass and a monitoring system to detect anomalies in bee habitats early. This approach aims to protect bee populations and enhance global food security through improved data-driven practices.

Published
2024
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30. Temperature and Heat Flux

Author

Kowalewski, Tomasz, Ligrani, Phillip, Dreizler, Andreas, Schulz, Christof, Fey, Uwe, Tropea, Cameron, editor, Yarin, Alexander L., editor, and Foss, John F., editor

Published
2007
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32. Atomic Force Microscopy

Author

Legleiter, Justin, Kowalewski, Tomasz, Atassi, M. Zouhair, editor, Berliner, Lawrence J., editor, Chang, Rowen Jui-Yoa, editor, Jörnvall, Hans, editor, Kenyon, Geroge L., editor, Wittman-Liebold, Brigitie, editor, Uversky, Vladimir N., editor, and Fink, Anthony L., editor

Published
2006
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34. Measurement of temperature and velocity fields of freezing water using liquid crystal tracers

Author

Kowalewski, Tomasz A., Beig, R., editor, Ehlers, J., editor, Frisch, U., editor, Hepp, K., editor, Jaffe, R. L., editor, Kippenhahn, R., editor, Ojima, I., editor, Weidenmüller, H. A., editor, Wess, J., editor, Zittartz, J., editor, Beiglböck, W., editor, Eisenächer, Monika, editor, Hutter, Kolumban, editor, Wang, Yongqi, editor, and Beer, Hans, editor

Published
1999
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41. Cu‐Catalyzed Atom Transfer Radical Polymerization: The Effect of Cocatalysts.

Author

Sun, Mingkang, Szczepaniak, Grzegorz, Dadashi‐Silab, Sajjad, Lin, Ting‐Chih, Kowalewski, Tomasz, and Matyjaszewski, Krzysztof

Subjects
ATOMS, CATALYTIC activity
Abstract

Atom transfer radical polymerization (ATRP) is one of the most powerful methods to prepare well‐defined (co)polymers. Cu‐catalyzed ATRP methods are most commonly used because of the excellent control and tunable catalytic activities via ligand functionalization. This minireview summarizes the development of Cu‐catalyzed ATRP in the presence of cocatalysts, which are used to regenerate CuI complex activators during polymerizations. Fundamentals of Cu‐based ATRP catalysts are first introduced, followed by the discussion of different types of cocatalysts in different Cu‐catalyzed ATRP methods. Recent developments of photochemical cocatalysts for oxygen‐tolerant ATRP and ATRP using long‐wavelength irradiation are highlighted, which significantly expand the applications of Cu‐catalyzed ATRP. Methods to study the properties of cocatalysts and their roles in Cu‐catalyzed ATRP are discussed, with an outlook for the future development of cocatalysts. [ABSTRACT FROM AUTHOR]

Published
2023
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48. Three-Dimensional Printable Conductive Semi-Interpenetrating Polymer Network Hydrogel for Neural Tissue Applications

Author

Rinoldi, Chiara, primary, Lanzi, Massimiliano, additional, Fiorelli, Roberto, additional, Nakielski, Paweł, additional, Zembrzycki, Krzysztof, additional, Kowalewski, Tomasz, additional, Urbanek, Olga, additional, Grippo, Valentina, additional, Jezierska-Woźniak, Katarzyna, additional, Maksymowicz, Wojciech, additional, Camposeo, Andrea, additional, Bilewicz, Renata, additional, Pisignano, Dario, additional, Sanai, Nader, additional, and Pierini, Filippo, additional

Published
2021
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49. Magnetic Fe doped ZnO nanofibers obtained by electrospinning

Author

Baranowska-Korczyc, Anna, Reszka, Anna, Sobczak, Kamil, Sikora, Bożena, Dziawa, Piotr, Aleszkiewicz, Marta, Kłopotowski, Łukasz, Paszkowicz, Wojciech, Dłużewski, Piotr, Kowalski, Bogdan J., Kowalewski, Tomasz A., Sawicki, Maciej, Elbaum, Danek, and Fronc, Krzysztof

Published
2012
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