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  • Digital appendix to 'Predictive capability of coupled rock behaviour – development of an experimentally based benchmark for numerical quality assurance (BeNuQuA)'

    Description:
    Simulation tasks and numerical codes have become increasingly complex in the context of temporal and spatial upscaling for understanding and predicting subsurface rock mass mechanics, for example associated with radioactive waste disposal. Benchmark procedures based on laboratory datasets are required to verify the predictive capabilities of computational approaches. In this study, a high-quality laboratory dataset of conventional geomechanical experiments on granite was generated. Numerical simulations of the experiments were performed as proof-of-concept using COMSOL Multiphysics and RocScience RS to derive a benchmark procedure for numerical quality assurance that can be applied to computational approaches in the context of nuclear waste disposal and beyond. The laboratory schedule was specifically developed for the numerical simulation of time-dependent deformation characteristics in granite. Splitting tensile strength, uniaxial compressive strength, and triaxial compressive strength of carefully characterised specimens were investigated at different strain rates covering five orders of magnitude. Strength decreased with decreasing strain rate, and the presence of water decreased strength significantly. A significant contribution of end face friction in the experimental setup to the results of strength tests was verified and recommendations for preparational and experimental procedures in deformation experiments on granite were derived. Based on the laboratory dataset, 2D numerical simulations with RocScience RS2 successfully reproduced the effect of different lubricants to modify end face friction on strength, and COMSOL Multiphysics was able to reproduce the time-dependent deformation characteristics observed for granite. Using crack phase field damage modelling, COMSOL Multiphysics predicted triaxial compressive strength from uniaxial compressive strength by adjusting nothing but the boundary conditions. In both approaches, the adaptation of microstructural properties was required to successfully simulate the experimental findings pointing to a distinct need to further improve the understanding of microstructural processes causing the time-dependent deformation characteristics and to evaluate the potential for temporal upscaling to long-term processes exceeding those covered by laboratory experiments. The results of this study will significantly contribute to gaining more confidence in the predictive capabilities of numerical codes and identify code-specific parameters that are critical for successful prediction. , Please cite the following reference when using our dataset in your research: , Witte L.C., Asghari Chehreh H., Backers T., Duda M., Aydin M. & Parvin S., 2024. Digital appendix to 'Predictive capability of coupled rock behaviour – development of an experimentally based benchmark for numerical quality assurance (BeNuQuA)'. ReSeeD Research Data Repository, Research Data Services (RDS) of the Ruhr University Bochum., and Access to the dataset is available upon request. Please contact Prof. Dr. Tobias Backers ( tobias.backers@rub.de) or Dr. Mandy Duda ( mandy.duda@rub.de) for further information.
    Keyword:
    rocks, laboratory experiments, code comparison, Comsol Multiphysics, Rocscience, numerical simulation, benchmark, granite, time-dependence, rock deformation, and nuclear waste
    Subject:
    Comsol Multiphysics, rock deformation, nuclear waste, rocks, time-dependence, laboratory experiments, Rocscience, code comparison, benchmark, numerical simulation, and granite
    Publisher:
    Language:
    English
    Date Uploaded:
    2025-02-20
    Date Modified:
    2025-06-05
    License:
    Creative Commons BY-SA Attribution-ShareAlike 4.0 International
    Resource Type:
    Dataset

  • Questionnaire Data – Digital Security Perceptions & Practices in 12 Countries

    Description:
    This dataset comprises self-reported questionnaire responses from 12,000 participants, capturing their conceptions, misconceptions, perceptions, and attitudes toward digital security. It also examines their familiarity with various digital security terms, experiences with cybercrime, and the protective measures participants employ to safeguard their online data. The survey, conducted in late 2021, includes responses from 1,000 participants in each of 12 countries: China, Germany, India, Israel, Italy, Mexico, Poland, Saudi Arabia, South Africa, Sweden, the UK, and the USA. , The dataset is provided in two files: , 1. "SurveyResponses_DigitalSecurityAroundTheWorld.csv": This file contains the complete survey responses from all 12,000 participants., 2. "DataMap_DigitalSecurityAroundTheWorld.pdf": This document includes each question and response option from the full questionnaire. It also maps the survey questions to their corresponding column names in the dataset, facilitating data interpretation., When using any part of our dataset for your own research, please make sure to cite the following publications: , - Franziska Herbert, Steffen Becker, Leonie Schaewitz, Jonas Hielscher, Marvin Kowalewski, Angela Sasse, Yasemin Acar, and Markus Dürmuth. 2023. A World Full of Privacy and Security (Mis)conceptions? Findings of a Representative Survey in 12 Countries. In Proceedings of the 2023 CHI Conference on Human Factors in Computing Systems (CHI '23). Association for Computing Machinery, New York, NY, USA, Article 582, 1–23.  https://doi.org/10.1145/3544548.3581410 , and - Franziska Herbert, Collins W. Munyendo, Jonas Hielscher, Steffen Becker, Yixin Zou. 2025. Digital Security Perceptions and Practices Around the World: A WEIRD vs. Non-WEIRD Comparison. In Proceedings of the 34th USENIX Security Symposium (USENIX Security 25). USENIX Association, Philadelphia, PA, USA.  https://www.usenix.org/conference/usenixsecurity25/presentation/herbert
    Keyword:
    human-centered security, privacy, online survey, and cross-country comparison
    Publisher:
    Language:
    English
    Date Uploaded:
    2025-01-24
    Date Modified:
    2026-01-20
    License:
    Creative Commons BY Attribution 4.0 International
    Resource Type:
    Dataset

  • Supporting Videos of plastron bursting of the DCP- and PFPE-based coatings

    Description:
    Supporting Videos for the Master Thesis: Antifouling properties of plastron forming, ultra-porous, superhydrophobic DCP- and PFPE-based coatings by Georg Breilmann The Master Thesis was done in the Working Group Biointerfaces of Prof. Dr. Axel Rosenhahn in the Analytical Chemistry Chair, Faculty of Chemistry and Biochemistry Ruhr-Universität Bochum. The Videos show five different coatings after a static diatom attachment assay with the algae strain Navicula perminuta. The plastron forming samples were handled with a diving bell and were exposed for the first time after incubation to air. The bursting of the plastrons are presented in the Videos.
    Keyword:
    Antifouling, properties, plastron forming, ultra-porous, superhydrophobic , DCP-based, PFPE-based, coatings, and plastron bursting
    Subject:
    Analytical Chemistry and Master Thesis
    Publisher:
    Language:
    English
    Date Uploaded:
    2024-11-01
    Date Modified:
    2025-02-19
    License:
    Creative Commons CC0 1.0 Universal
    Resource Type:
    Audiovisual

  • LAT Hologramm Software 2.3

    Description:
    Diese Software dient zum Erstellen computergenerierter Hologramme für die holographische Strahlformung von Laserstrahlen mittels Spatial Light Modulator. Zudem unterstützt die Software die Ansteuerung und Synchronisation der Laborhardware. Version 2.3 der Hologrammsoftware, letzte Änderung 17.10.2024 and Die Software wurde für Experimente bzw. Simulationen mehrerer Veröffentlichungen eingesetzt, u.a. Marx, Jan, Felix Behlau, Damian Haske, Cemal Esen, und Andreas Ostendorf. „Two-Photon Polymerization Based Fabrication of Millimeter-Sized Precision Fresnel Optics“. Applied Optics 63, Nr. 24 (8. August 2024): 6495–6503.  https://doi.org/10.1364/ao.531069 Marx, Jan, Cemal Esen, Christian Lutz , Ralf Hellmann, und Andreas Ostendorf. „Holographic Tuning of Physical Axicons“. In LiM 2023 Proceedings. Hannover: Wissenschaftliche Gesellschaft Lasertechnik und Photonik e.V. (WLT), 2023.  https://wlt.de/sites/default/files/2023-09/Contribution_154.pdf. Marx, Jan, Christian Lutz, Ralf Hellmann, und Cemal Esen. „Holographic Multi-Spot Generation for Ultra-Short Pulse Bessel Beam Processing of Stainless Steel“. In 12th CIRP Conference on Photonic Technologies [LANE 2022], herausgegeben von M. Schmidt, F. Vollertsen, und B. M. Colosimo, 111:648–52. Amsterdam: Elsevier, 2022.  https://doi.org/10.1016/j.procir.2022.08.003
    Keyword:
    Hologram Calculation and Laboratory Control
    Publisher:
    Language:
    English and German
    Date Uploaded:
    2024-10-17
    Date Modified:
    2025-02-19
    License:
    MIT License
    Resource Type:
    Software

  • LAT Hologramm Software

    User Collection
    Description:
    Diese Software dient zum Erstellen computergenerierter Hologramme für die holographische Strahlformung von Laserstrahlen mittels Spatial Light Modulator. Zudem unterstützt die Software die Ansteuerung und Synchronisation der Laborhardware.
    Keyword:
    Laboratory Control and Hologram Calculation
    Publisher:
    Applied Laser Technologies, Ruhr University Bochum
    Language:
    German and English
    Date Created:
    17.10.2024
    Resource Type:
    Software
    0Collections
    1Works

  • Identity Broker Analysis

    Description:
    Single Sign-On (SSO) is an authentication process that allows users to access multiple services with a single set of login credentials. Although SSO improves the user experience, it poses challenges to developers to implement complex authentication protocols securely. External services, called brokers, simplify the integration of SSO. In this paper, we shed light on the emerging brokered SSO ecosystem, focusing on the security of the newly introduced actor, the broker. We systematically evaluate the landscape of brokered SSO, uncovering significant blind spots in previous research. Our study reveals that 25% of the websites with SSO integrate brokers for authentication, an area that has not been covered by any previous research. Through our comprehensive security evaluation, we identify three categories of threats associated with brokered SSO: (1) insufficient validation of redirect chains enabling injection attacks, (2) unauthorized data access enabling account takeovers, and (3) violations of security best current practices. We expose vulnerabilities in over 50 brokers, compromising the security of more than 2k websites. These findings represent only a lower bound of a critical situation, underscoring the urgent need for improved security measures and protocols to safeguard the integrity of brokered SSO systems.
    Keyword:
    Single Sign-On and Identity Broker
    Subject:
    IT Security, Single Sign-On, Authorization and Authentication, and Identity Brokers
    Publisher:
    Language:
    English
    Date Uploaded:
    2024-10-02
    Date Modified:
    2025-07-25
    License:
    MIT License
    Resource Type:
    Dataset