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Mathematical Framework for the Representation of the Travel of an Accelerometer-Based Texture Testing Device
No full textRecently, an accelerometer-based device (Vienna Surface Tester (VST)) has been developed for testing the surface characteristics of floors, beddings and turf grounds. The accelerometers are placed in a sphere, which will be dropped in free fall on a test surface. By observing changes in acceleration during impact, researchers can deduce various material characteristics. A down-sized version of this device (Surface Tester of Food Resilience (STFR)) has been proposed for texture testing of foods. Whereas the movement of the VST can be described by the laws of free fall, the STFR follows a constrained circular path due to its attachment to a rod and swivel. We refined the mathematical representation of the different phases of the STFR spherical probe's trajectory (fall, impact and rebound), and we modified the mathematical models for the STFR probe to extend the measurement range
A Compact Zigzag Compressor for Spectrally-Divided CPA
No full textTraditionally, the practical stretching and compression ratio in fs CPA is limited by the width of the diffraction gratings and associated with the prohibitive cost, substrate translation range in ion/electron beam machines, etc. Doubling dispersive power by double-passing the compressor is not advisable as it squares the diffraction losses. Techniques to mitigate the grating aperture limit include phase-locked tiling of multiple gratings [1] or spatial pre-chirping [2] to accommodate more colors on the largest compressor grating. In addition, there exist numerous schemes to enhance dispersive power with additional angular dispersion elements, e.g. VIPA [3], FACED [4], Spectral Shuttle, [5] which cannot be applied for dispersion management of fs pulses because of discrete spectral modes in their throughput and/or inability to match the stretcher and compressor dispersion. Here we present a possible dispersion management solution, summarized in Fig. 1, which answers the challenge of further energy scaling without changing the working aperture of the stretcher and compressor gratings, ensures mechanical robustness and compactness and does not introduce additional diffraction losses in the compressor grating pair
Structured Track & Trace Use Case Development in Collaborative Industry 4.0 Research Projects
No full textCollaborative research projects in the context of Industry 4.0 present unique challenges and opportunities,
particularly when engaging multiple corporate partners with diverse objectives. This article presents a structured method for collecting, analyzing, and clustering corporate use cases within large consortium projects to address shared challenges and leverage synergies. The approach includes initial use case canvases, on-site interviews, and a standardized questionnaire to gather context-specific details. These use cases are then clustered into topical groups, such as indoor/outdoor tracking or standardization, while aligning with the companies’ areas of interest.
The final assignment of use cases to research partners ensures efficient further development. Results from an ongoing Industry 4.0 research project, illustrate how this process can reduce fragmentation, maximize resource utilization, and accelerate innovation. By systematically identifying and merging similar use cases, project managers can tackle overarching Industry 4.0 challenges in a more scalable, collaborative, and profitable manner
Towards Comprehensive Encoderless Motor Drive Systems for Railway Traction Applications
No full textAn optimal encoderless saliency-based motor drive system should exhibit the same control performance than its sensor-based counterpart while removing the need for position sensing at any stage. This includes the initial commissioning stage at which all motor saliency attributes are identified. However, the existence of a load-dependent phase difference between the saliency vectors and the actual position poses an evident challenge for the realization of encoderless commissioning. Without taking the saliency phase shift into consideration, encoderless control performance during load transients worsens. In this work, a saliency commissioning method is presented, capable of accurately identifying saliency amplitude and phase shifts without position sensor. Thus, the shaft encoder dependency during the commissioning stage is removed. The method is experimentally tested on two different multi-salient traction motors
Alba: The Dawn of Scalable Bridges for Blockchains
No full textOver the past decade, cryptocurrencies have garnered attention from academia and industry alike, fostering a diverse blockchain ecosystem and novel applications. The inception of bridges improved interoperability, enabling asset transfers across different blockchains to capitalize on their unique features. Despite their surge in popularity and the emergence of Decentralized Finance (DeFi), trustless bridge protocols remain inefficient, either relaying too much information (e.g. light-client-based bridges) or demanding expensive computation (e.g. zk-based bridges). These inefficiencies arise because existing bridges securely prove a transaction’s on-chain inclusion on another blockchain. Yet this is unnecessary as off-chain solutions, like payment and state channels, permit safe transactions without on-chain publication. However, existing bridges do not support the verification of off-chain payments. This paper fills this gap by introducing the concept of Pay2Chain bridges that leverage the advantages of off-chain solutions like payment channels to overcome current bridges’ limitations. Our proposed Pay2Chain bridge, named Alba, facilitates the efficient, secure, and trustless execution of conditional payments or smart contracts on a target blockchain based on off-chain events. Alba, besides its technical advantages, enriches the source blockchain’s ecosystem by facilitating DeFi applications, multi-asset payment channels, and optimistic stateful off-chain computation.
We formalize the security of Alba against Byzantine adversaries in the UC framework and complement it with a game theoretic analysis. We further introduce formal scalability metrics to demonstrate Alba’s efficiency. Our empirical evaluation confirms Alba’s efficiency in terms of communication complexity and on-chain costs, with its optimistic case incurring only twice the cost of a standard Ethereum transaction of token ownership transfer
HouseEurope! Bedeutung für Wien und Österreich
No full textFolge #37 widmet sich erneut HouseEurope! – einem Anliegen, das sich entschieden für eine Bauwende einsetzt. In dieser Folge richtet sich der Blick auf Wien und Österreich und darauf, wie die Initiative dort wahrgenommen wird.
Im Rahmen der Veranstaltung „Power to Renovation“, die im Juni 2025 im Az W (Architekturzentrum Wien) stattgefunden hat, spricht Lene Benz (Az W) mit Christine Dornaus (BIG), Magdalena Lang (IG Architektur), Nicole Büchl (wohnfonds_wien), Daniel Fügenschuh (Bundeskammer der Ziviltechniker:innen) und Verena Konrad (HouseEurope!, vai) über die Ziele der Initiative und deren mögliche Wirkungsweisen in Wien und Österreich.
HouseEurope! ist eine parlamentarische Bürgerinitiative auf europäischer Ebene. Ihr Ziel ist es, den Abriss von Gebäuden zu reduzieren und stattdessen Sanierung, Wiederverwendung und Umbau zu fördern. Dahinter steht die Überzeugung, dass der Gebäudebestand nicht nur eine ökologische Ressource ist, sondern auch eine kulturelle und soziale.
Diese Folge ist Teil einer Mini-Serie zur Initiative HouseEurope!, kuratiert von Madlyn Miessgang und Verena Konrad und mit Unterstützung durch das Az W (Architekturzentrum Wien)
Gas-phase electrophoresis in (bio-)nanoparticle reserach
No full text"Gas-phase electrophoresis applying a nES GEMMA instrumentation: A highly versatile analytical technique in (bio-)nanoparticle characterization"
Presentation at TCH Science Days, TU Wien, Vienna, Austria 2024
Talk by Victor U. Weiss, TU Wien (Vienna University of Technology), Institute of Chemical Technologies and Analytic