TY - JOUR A1 - Schubert, Sven A1 - Probst, Ulrich A1 - Winkler, H. P. T1 - Behaviour of metallic seals in CASTOR casks under normal and accident conditions of transport: qualification requirements KW - Transport cask KW - Seal KW - Leak tightness KW - Accident KW - Qualification program KW - Transportbehälter KW - Radioaktive Stoffe KW - Dichtung KW - Dichtheit KW - Unfall KW - Qualifikationsprogramm PY - 2009 DO - https://doi.org/10.1179/174651009X12555104004055 SN - 1746-5095 SN - 1746-5109 SN - 0957-476X VL - 20 IS - 4 SP - 179 EP - 182 PB - Ramtrans Publ. CY - Ashford AN - OPUS4-20708 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Winkler, Nicolas P. T1 - Gas Distribution Mapping With Radius-Based, Bi-directional Graph Neural Networks (RABI-GNN) N2 - Gas Distribution Mapping (GDM) is essential in monitoring hazardous environments, where uneven sampling and spatial sparsity of data present significant challenges. Traditional methods for GDM often fall short in accuracy and expressiveness. Modern learning-based approaches employing Convolutional Neural Networks (CNNs) require regular-sized input data, limiting their adaptability to irregular and sparse datasets typically encountered in GDM. This study addresses these shortcomings by showcasing Graph Neural Networks (GNNs) for learningbased GDM on irregular and spatially sparse sensor data. Our Radius-Based, Bi-Directionally connected GNN (RABI-GNN) was trained on a synthetic gas distribution dataset on which it outperforms our previous CNN-based model while overcoming its constraints. We demonstrate the flexibility of RABI-GNN by applying it to real-world data obtained in an industrial steel factory, highlighting promising opportunities for more accurate GDM models. T2 - International Symposium on Olfaction and Electronic Nose (ISOEN) CY - Grapevine, TX, USA DA - 12.05.2024 KW - Gas distribution mapping KW - Spatial interpolation KW - Graph neural networks KW - Mobile robot olfaction PY - 2024 AN - OPUS4-60106 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Winkler, Nicolas P. T1 - Heterogeneous Sensor Networks: Challenges and Insights from an Industrial Scenario N2 - Monitoring airborne pollutants is critical for occupational health, particularly in industrial environments where workers are exposed to hazardous emissions. Traditional measurements are typically limited to single-day campaigns, resulting in extremely sparse temporal data. Low-cost sensor networks offer a way to increase spatial and temporal resolution but are limited by issues of accuracy and reliability. To address this, we present a wireless heterogeneous sensor network that integrates low-cost stationary nodes with high-quality sensors on mobile platforms, including ground and aerial robots. We deploy this system in a hot rolling mill facility and evaluate its performance under real-world conditions. Field experiments reveal dynamic pollutant patterns, such as altitude-dependent PM2.5 gradients and temperature fluctuations. By introducing synchronized “rendezvous” events between mobile and stationary nodes, we demonstrate correlation capabilities of sensors. Our spatiotemporal analysis shows that, despite limitations of mobile sensing, strategically combining heterogeneous data sources enables capturing pollutant dynamics in complex industrial settings. T2 - IEEE SENSORS 2025 CY - Vancouver, BC, Kanada DA - 19.10.2025 KW - Environmental monitoring KW - Sensor data fusion KW - Sensor system networks PY - 2025 AN - OPUS4-64506 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Winkler, Nicolas P. T1 - Remote gas sensing with multicopter platforms N2 - This presentation gives an introduction to the gas-sensitive aerial robots developed at BAM, including various application examples in the field of mobile robot olfaction: gas source localization and gas distribution mapping. T2 - Zweites Innovationsforum "Autonome, mobile Dienste; Services für Mobilität" CY - Berlin, Germany DA - 04.06.2019 KW - Localization of gas sources KW - Mobile Robot Olfaction KW - Nano UAV Swarm KW - Tomographic reconstruction of gas plumes KW - Tunable Diode Laser Absorption Spectroscopy (TDLAS) KW - UAV-REGAS PY - 2019 AN - OPUS4-48167 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Winkler, Nicolas P. T1 - Boosting a Low-Cost Sensor Network with Mobile High-Quality Sensors N2 - The Motivation of RASEM (Robot-assisted Environmental Monitoring): Monitoring of the air quality in industrial environments is inevitable to meet safety Standards. Because of economic and practical reasons, measurements are carried out sparsely in terms of time and space. Newest developments on the field of low cost sensor technology enable cost efficient long term monitoring of gases and dust T2 - 36th Danubia-Adria Symposium on Advances in Experimental Mechanics CY - Pilsen, Czech Republic DA - 24.09.2019 KW - RASEM KW - Sensor network KW - Low-cost KW - Occupational health KW - Mobile Robot Olfaction PY - 2019 AN - OPUS4-49632 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Enderlein, M. A1 - Kuna, M. A1 - Ricoeur, A. A1 - Baer, Wolfram A1 - Müller, Karsten A1 - Klein, K. A1 - Winkler, H. P. T1 - Numerische Analyse des Stoßbiegeversuchs zur Ermittlung der dynamischen Bruchzähigkeit KW - Bruchmechanik KW - Finite-Elemente-Methode KW - Dynamisches J-Integral KW - 3-Punkt-Biege-Großprobe PY - 2003 SN - 0943-3473 SN - 1616-4687 IS - 235 SP - 251 EP - 260 PB - DVM CY - Berlin AN - OPUS4-32709 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rolle, Annette A1 - Probst, Ulrich A1 - Ballheimer, Viktor A1 - Müller, Karsten A1 - Winkler, H. P. T1 - Transport condition effects on the sealing system and activity release within spent fuel transport casks N2 - Transport casks for spent fuel have to meet the International Atomic Energy Agency requirements for routine, normal and accident conditions of transport (RCT, NCT, and ACT). In regard to Containment capability a transport cask has to be designed to restrict the release of radioactive content to the required limits of 10'6 A2 per hour under NCT and A2 per week for ACT. Two barriers, which should avoid the release of fuel particles and fission products to the environment, are discussed in this paper: fuel rod claddings and the cask sealing System composed of cask body as well as of bolted lids and metallic seals. Both barriers can be affected by transport conditions. Vibrations and impact forces can increase the fraction of rods undergoing cladding breaches and can also lead to deformations or displacements of cask components involving an unloading or a movement of the lids or the seals. The above mentioned effects have to be properly considered in the safety analysis carried out by the applicant. The assumptions and results of the activity release calculations are verified by BAM Federal Institute for Materials Research and Testing. BAM is the German competent authority responsible, in particular, for Containment safety assessment within the licensing procedure of casks for spent fuel. T2 - RAMTRANSPORT 2012 - 9th International Conference on the Radioactive Materials Transport and Storage CY - London, UK DA - 22.05.2012 KW - Radioactive material KW - Safety assessment KW - Spent fuel KW - Leak tightness PY - 2012 SP - 1 EP - 9 AN - OPUS4-26498 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -