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Recent Submissions
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Simulation of tri-axial stress redistribution effect in concrete under fatigue loading: lattice discrete model vs. microplane model
(CIMNE, 2024-10-29) Aguilar Rueda, Mario; Vořechovský, Miroslav; BAKTHEER, Abedulgader; Wan-Wendner, Roman; Vorel, Jan; Chudoba, Rostislav
Adaptive sequential sampling provides a good technique to refine and increase the accuracy of surrogate models, used for reliability analysis, based on the selection of possible future candidates in the input domain (i.e., random variables). In the present research, different methodologies for obtaining the training sample for a surrogate model were explored, considering sample size, distribution of the points, and identification of the failure region. The effects on the reliability of the slope stability under vertical loading based on the safety factors from Bishop’s simplified method were obtained. The results reinforce the importance of the characteristics of the training sample used for the application of surrogate models to describe limit states and their accuracy when employed for the computation of the reliability index.
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Developers’ Insight on Manifest v3 Privacy and Security Webextensions
(SCITEPRESS – Science and Technology Publications, Lda., 2025-10-21) Polčák, Libor; Maone, Giorgio; McMahon, Michael; Bednář, Martin
Webextensions can improve web browser privacy, security, and user experience. The APIs offered by the browser to webextensions affect possible functionality. Currently, Chrome transitions to a modified set of APIs called Manifest v3. This paper studies the challenges and opportunities of Manifest v3 with an indepth structured qualitative research. Even though some projects observed positive effects, a majority express concerns over limited benefits to users, removal of crucial APIs, or the need to find workarounds. Our findings indicate that the transition affects different types of webextensions differently; some can migrate without losing functionality, while others remove functionality or decline to update. The respondents identified several critical missing APIs, including reliable APIs to inject content scripts, APIs for storing confidential content, and others.
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Influence of nebulizer pressure drop on breathing profiles and aerosol deposition in human airways
(2025-06-13) Misik, Ondrej; Prinz, Frantisek; Elcner, Jakub; Cabalka, Matouš; Belka, Miloslav; Lízal, František
Breathing flow rate profiles are crucial for predicting aerosol drug delivery. While aerosol particle characteristics are determined by the inhalation device, breathing profiles are patient-specific, making them an essential topic for personalized medicine. This study investigates the influence of nebulizer pressure drop on breathing profiles and subsequent aerosol deposition within human airways. Ten male subjects performed spontaneous, and slow and deep breathing manoeuvres through three different nebulizers (one jet and two mesh nebulizers). Breathing profiles were recorded, and the impact of nebulizer pressure drop on flow rate profiles was analyzed. Computational modelling of airway aerosol deposition was performed for particles ranging from 1 to 10 mu m in diameter, based on the recorded boundary conditions. The jet nebulizer exhibited the most significant flow rate decrease due to its high pressure drop, increasing particle deposition in the lower airways. These findings are important for personalized modelling and the application of a digital twin approach in treatment design, leading to more effective and targeted drug delivery.
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Effect of atmosphere on thermal debinding of DLP-printed ceramics
(2026-03-01) Šťastný, Přemysl; Man, Ondřej; Brouczek, Dominik; Schwentenwein, Martin; Trunec, Martin
This study investigates the effect of the gas atmosphere on the size limit for defect-free thermal binder removal in 3D-printed alumina bodies fabricated using digital light processing (DLP). Binder removal from cylindrical specimens with diameters ranging from 5mm to 15mm was carried out in either nitrogen or air atmospheres under different heating schedules. In nitrogen, defect-free debinding was achieved for specimens up to 15mm in diameter. In contrast, defect-free binder removal in air was limited to specimens as small as 5mm. Thermogravimetric analysis and microstructural characterization were employed to elucidate the role of the atmosphere in binder removal and defect formation. Microstructural differences between debinding in air and nitrogen were identified. Based on these results, mechanisms of binder removal in ceramic DLP printed bodies with acrylate-based crosslinked binder systems are proposed, and critical steps for achieving defect-free processing are discussed.
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Computational study of mesh-structured triboelectric generators
(2025-06-10) Verners, Osvalds; Bajer, Jan; Hadaš, Zdeněk; Gaidukovs, Sergejs
Triboelectric generators (TEGs) are vital for transforming mechanical energy into electrical power, facilitating the creation of self-powered devices that minimise reliance on traditional power sources. Furthermore, most typical TEGs are limited to simple 2D forms and films, limiting their potential applications. We have focused on developing 3D architectures with volumetric triboelectric dipoles to solve this. To this end, two polymeric materials with different triboelectric properties were employed for the designing of 3D architectures and the optimisation of all-polymer TEG performance. Our simplified design eliminates the integration of internal electrodes in a 3D structure. This study paves the way towards volumetric 3D TEG architectures for improved mechanical energy harvesting.