Sven Frei, Fabian Wismeth, Benjamin Gilfedder,
Zusammenfassung Eine unbekannte, schwer zu bestimmende aber zentrale Komponente in der Verockerungs-Problematik der Spree ist der lokale Grundwasserzufluss. Als Teil dieser Studie wurden mithilfe des natürlichen Tracers Radon ( 222 Rn) die lokalen Grundwasserzuflüsse in die Spree und Kleine Spree im Lausitzer Braunkohlerevier bestimmt. Der gesamte Grundwasserzufluss, für das 20 km lange Teilstück der Kleinen Spree und den 34 km langen Abschnitt der Spree, variierte je nach Messkampagne zwischen ~3. ...
Tópico(s): Groundwater and Isotope Geochemistry
2020 - Springer Science+Business Media | Grundwasser
Andrew Gleadow, S. J. Gleadow, Stefan Frei, Fabian Kohlmann, Barry P. Kohn,
Tópico(s): Geological Studies and Exploration
2009 - Elsevier BV | Geochimica et Cosmochimica Acta
Thomas Rieckmann, Fabian Frei, Susanne Völker,
Abstract Summary: A rigorous process model has been developed which describes a closed‐loop recycling system for PET beverage bottles. The reaction / mass transport model is aimed at the dominant quality parameters such as intrinsic viscosity, concentration of acetaldehyde, concentration of carboxylic end‐groups, and concentration of vinyl end‐groups, respectively. The model covers the main process steps being preform production (injection moulding), drying, solid‐state polycondensation, and melt filtration. ...
Tópico(s): Effects and risks of endocrine disrupting chemicals
2011 - Wiley | Macromolecular Symposia
Thomas Rieckmann, Katharina Besse, Fabian Frei, Susanne Völker,
Summary A systematic approach was carried out to quantify the discolouration of different poly(ethylene terephthalate) (PET) samples such as virgin bottle‐grade resins, bottle‐to‐bottle recycled chips, and bottle‐to‐bottle recycled flakes. The PET samples were treated in a fixed bed reactor in the solid‐state. The possible influencing parameters such as residence time, temperature, and oxygen partial pressure were studied by analysing the CIELAB b*‐coordinate (axis = yellow to blue) with a spectrophotometer ...
Tópico(s): Microplastics and Plastic Pollution
2013 - Wiley | Macromolecular Symposia
Gernot Bonkat, Olivier Braissant, Malte Rieken, Georg Müller, Reno Frei, André van der Merwe, Fabian Siegel, Thomas C. Gasser, Stephen Wyler, Alexander Bachmann, Andreas F. Widmer,
Microbial ureteral stent colonisation (MUSC) is one leading risk factor for complications associated with ureteral stent placement. As MUSC remains frequently undetected by standard urine cultures, its definitive diagnosis depends on microbiological investigation of the stent. However, a standard reference laboratory technique for studying MUSC is still lacking. A total of 271 ureteral stents removed from 199 consecutive patients were investigated. Urine samples were obtained prior to device removal. ...
Tópico(s): Ureteral procedures and complications
2012 - Springer Science+Business Media | World Journal of Urology
Gernot Bonkat, Malte Rieken, Fabian Siegel, Reno Frei, J. Steiger, Isabel Gröschl, Thomas C. Gasser, Salome Dell‐Kuster, Rachel Rosenthal, Lorenz Gürke, Stephen Wyler, Alexander Bachmann, Andreas F. Widmer,
Ureteral stent insertion at the time of renal transplantation significantly decreases complications of urine leakage and obstruction, but bears an intrinsic risk of microbial colonization. Associated urinary tract infection (UTI) may pose a significant risk for graft infection and subsequent graft failure, in particular, during high-level immunosuppression in the early phase after transplantation. The aims of this prospective study were (i) to assess the frequency of microbial ureteral stent colonization ( ...
Tópico(s): Renal and Vascular Pathologies
2011 - Wiley | Transplant Infectious Disease
Gernot Bonkat, Malte Rieken, Georg Müller, Alexander Roosen, Fabian Siegel, Reno Frei, Stephen Wyler, Thomas Gasser, Alexander Bachmann, Andreas F. Widmer,
Ureteral stents are frequently associated with side effects. Most patients suffer from storage lower urinary tract symptoms (LUTS). Storage LUTS are commonly attributed to the irritation of the trigone, smooth muscle spasm or a combination of factors. The relationship between microbial ureteral stent colonization (MUSC) and de novo or worsening storage LUTS has not been investigated yet.Five hundred ninety-one polyurethane ureteral stents from 275 male and 153 female patients were prospectively evaluated. ...
Tópico(s): Pediatric Urology and Nephrology Studies
2012 - Springer Science+Business Media | World Journal of Urology
Manuel Boebel, Fabian Frei, Frank Blumensaat, Christian Ebi, Marcel Meli, Andreas Rüst,
Drinking water is becoming increasingly scarce as the world’s population grows and climate change continues. However, there is great potential to improve drinking water pipelines, as 30% of fresh water is lost between the supplier and consumer. While systematic process monitoring could play a crucial role in the early detection and repair of leaks, current practice requires manual inspection, which is both time-consuming and costly. This project envisages maintenance-free measurements at numerous ...
Tópico(s): IoT Networks and Protocols
2023 - Multidisciplinary Digital Publishing Institute | Journal of Low Power Electronics and Applications
S. Hoda Moosavi, Michael Kroener, Maxi Frei, Fabian Frick, Sven Kerzenmacher, Peter Woias,
A nanowire characterization platform is designed and fabricated in MEMS-technology for the thermoelectric and structural characterization of single nanowires. The latter is achieved by making the chip compatible to TEM holder, by restricting its thickness to less than 160 μm and its diagonal dimensions to less than 3 mm. Two different fabrication technologies are presented for the realization of such platform, based on a design reproducing the functional requirements. Our first fabrication technique ...
Tópico(s): Molecular Junctions and Nanostructures
2018 - IEEE Computer Society | IEEE Transactions on Semiconductor Manufacturing
R. Kueng, Daniel Frei, W. Volken, Fabian Stuermlin, Marco Stampanoni, Daniel M. Aebersold, Peter Manser, M.K. Fix,
To provide fast and accurate dose calculation in voxelized geometries for proton radiation therapy by implementing an adaptive step size algorithm in the proton macro Monte Carlo (pMMC) method.The in-house developed local-to-global MMC method for proton dose calculation is extended with an adaptive step size algorithm for efficient proton transport through a voxelized geometry by sampling transport parameters from a pre-simulated database. Adaptive choice of an adequate slab size in dependence of ...
Tópico(s): Radiation Effects in Electronics
2019 - BioMed Central | Radiation Oncology
Elisabet Burjons, Fabian Frei, Jasmin Smula, David Wehner,
We modify one of the foundational online problems, Disjoint Path Allocation, to include weighted requests. We provide a comprehensive competitive analysis, incorporating the viewpoints of both advice complexity and parametrized complexity. Our bounds feature a consistent parametrization and closely trace the trade-off between advice complexity and competitiveness.
Tópico(s): Advanced Bandit Algorithms Research
2018 - Springer Science+Business Media | Lecture notes in computer science
Fabian Frei, Edith Hemaspaandra, Jörg Rothe,
Graph parameters such as the clique number and the chromatic number are central in many areas, ranging from computer networks to linguistics to computational neuroscience to social networks. In particular, the chromatic number of a graph can be applied in solving practical tasks as diverse as pattern matching, scheduling jobs to machines, allocating registers in compiler optimization, and even solving Sudoku puzzles. Typically, however, the underlying graphs are subject to (often minor) changes. ...
Tópico(s): graph theory and CDMA systems
2021 - Elsevier BV | Journal of Computer and System Sciences
S. Hoda Moosavi, Michael Kroener, Maxi Frei, Fabian Frick, Sven Kerzenmacher, Peter Woias,
We report on the fabrication of a silicon platform for the thermoelectric and structural characterization of single nanowires, equipped with nanoporous electrodes. Controlled wafer thinning to a thickness of 160 μm results in platform chips, which can be inserted into Transmission Electron Microscopes (TEM) for the nanowire's structural composition analysis. Our fabrication approach comprises the Bosch process (ICP), and "dicing before grinding" techniques to achieve this small thickness. To study ...
Tópico(s): Anodic Oxide Films and Nanostructures
2016 - IOP Publishing | Journal of Physics Conference Series
Alexandre Speierer, Patricia Chocano-Bedoya, Daniela Anker, Alexia Schmid, Dirk Keidel, Thomas Vermes, Medea Imboden, Sara Levati, Giovanni Franscella, Laurie Corna, Rebecca Amati, E Harju, Chantal Luedi, Gisela Michel, Caroline Veys-Takeuchi, Claire Zuppinger, Semira Gonseth, Valérie D’Acremont, Ismaël Tall, Éric Salberg, Hélène Baysson, Elsa Lorthe, Francesco Pennacchio, Anja Frei, Marco Kaufmann, Marco Geigges, Erin West, Nathalie Schwab, Stéphane Cullati, Arnaud Chioléro, Christian R. Kahlert, Silvia Stringhini, Fabian Vollrath, Nicole Probst‐Hensch, Nicolas Rodondi, Milo A. Puhan, Viktor von Wyl,
Objectives: To describe the rationale, organization, and procedures of the Corona Immunitas Digital Follow-Up (CI-DFU) eCohort and to characterize participants at baseline. Methods: Participants of Corona Immunitas, a population-based nationwide SARS-CoV-2 seroprevalence study in Switzerland, were invited to join the CI-DFU eCohort in 11 study centres. Weekly online questonnaires cover health status changes, prevention measures adherence, and social impacts. Monthly questionnaires cover additional ...
Tópico(s): Misinformation and Its Impacts
2022 - Springer Science+Business Media | International Journal of Public Health
Thomas Rieckmann, Fabian Frei, Susanne Völker,
Abstract Summary: Innovative reactor internals consisting of a number of vertically stacked perforated plates have been proposed to increase mass transfer rates of volatiles from highly viscous polymer melts. A mathematical model comprising mass and enthalpy balances for the polycondensation of polyamide 6 has been used to evaluate the new reactor design. According to the simulation, the alternating arrangement of devolatilization and residence zones leads to an effective removal of reaction water ...
Tópico(s): Polymer Science and PVC
2011 - Wiley | Macromolecular Symposia
The MapReduce framework has firmly established itself as one of the most widely used parallel computing platforms for processing big data on tera- and peta-byte scale. Approaching it from a theoretical standpoint has proved to be notoriously difficult, however. In continuation of Goodrich et al.'s early efforts, explicitly espousing the goal of putting the MapReduce framework on footing equal to that of long-established models such as the PRAM, we investigate the obvious complexity question of how ...
Tópico(s): Cryptography and Data Security
2023 - Elsevier BV | Journal of Parallel and Distributed Computing
Fabian Fink, Lukas Frei, Oliver Gloede,
• Novel multivariate time-varying coefficients model for Swiss franc exchange rates. • Decomposing FX returns in three global factors and local uniqueness. • Explaining about 73% of the variation in USDCHF and 37% of the variation in EURCHF. • Risk contributing the most highlighting safe-haven characteristics of Swiss franc. • Episodes of strong momentum present in Swiss franc exchange rate. This paper develops an FX factor model to decompose short-term bilateral exchange rate dynamics into different global factors ...
Tópico(s): Financial Risk and Volatility Modeling
2021 - Elsevier BV | Journal of International Money and Finance
Hans-Joachim Böckenhauer, Fabian Frei, Silvan Horvath,
We analyze the Disjoint Path Allocation problem (DPA) in the priority framework. Motivated by the problem of traffic regulation in communication networks, DPA consists of allocating edge-disjoint paths in a graph. Like an online algorithm, a priority algorithm receives its input sequentially and must output irrevocable decisions for individual input items before having seen the entire input. However, in contrast to the online setting, a priority algorithm may choose an order on the set of all possible ...
Tópico(s): Distributed systems and fault tolerance
2022 - Springer Science+Business Media | Communications in computer and information science
Fabian Holzgreve, Laura Maltry, Jasmin Hänel, Helmut Schmidt, Andreas Bader, Markus Frei, Natalie Filmann, David A. Groneberg, Daniela Ohlendorf, Anke van Mark,
In the context of workplace health promotion, physical activity programs have been shown to reduce musculoskeletal diseases and stress, and to improve the quality of life. The aim of this study was to examine the effects of using the “five-Business” stretch training device for office workers on their quality of life. A total of 313 office workers (173m/137f) participated voluntarily in this intervention–control study with an average age of 43.37 ± 11.24 (SD) years, 175.37 ± 9.35 cm in height and 75.76 ± ...
Tópico(s): Occupational Health and Performance
2020 - Multidisciplinary Digital Publishing Institute | International Journal of Environmental Research and Public Health
Fabian Holzgreve, Laura Fraeulin, Jasmin Haenel, Helmut Schmidt, Andreas Bader, Markus Frei, David A. Groneberg, Daniela Ohlendorf, Anke van Mark,
Objectives For the prevention of musculoskeletal diseases (MSDs), stretch training can be a measure of the workplace health promotion (WHP) for office workers. This can lead to an increase in mobility and, ultimately, reduce or prevent MSD. The aim of the study was to examine a standardised and individualised stretch training on a device, specifically ‘five Business’, for the prevalence of MSD. Design This study is a non-randomised control study. Setting WHP programme with clerical employees of a German ...
Tópico(s): Fibromyalgia and Chronic Fatigue Syndrome Research
2021 - BMJ | BMJ Open
Johannes Kraft, Janita E. van Timmeren, Simon Frei, Michael Mayinger, Kim Borsky, Corinna Kirchner, L. S. Stark, Stephanie Tanadini‐Lang, Fabian Wolpert, Michael Weller, Henry C. Woodruff, Matthias Gückenberger, Nicolaus Andratschke,
Numerous prognostic scores (PS) for patients with brain metastases (BM) have been developed. Recently, PS based on laboratory parameters were introduced to better predict overall survival (OS). A comprehensive comparison of the wide range of scores in a modern patient collective is still missing.Twelve PS considering clinical parameters only at the time of BM diagnosis were calculated for 470 patients receiving upfront SRS between January 2014 and March 2020. In a subcohort of 310 patients where a ...
Tópico(s): Lung Cancer Treatments and Mutations
2022 - Elsevier BV | Radiotherapy and Oncology
Mikayel Musheghyan, Fabian Lücking, Zhao Cheng, Harald Frei, A. Assion,
We demonstrate a single-stage, multipass Ti:sapphire amplifier capable of delivering sub-13 fs, 3.2 mJ pulses at a 1 kHz repetition rate. Gaussian filters are used to suppress the gain-narrowing effect, thereby enabling the achievement of an ultrabroadband flat-top spectrum with a FWHM>130 nm. The carrier-envelope phase (CEP) of the output pulses is actively stabilized via the feed-forward scheme (for the oscillator) and a fast 1 kHz f-to-2f interferometer, which corrects the amplifier-induced CEP ...
Tópico(s): Mass Spectrometry Techniques and Applications
2019 - Optica Publishing Group | Optics Letters
Charles M. Norris, Richard L. Fabian, Daniel Miller, John R. Clark, Thomas J. Ervin, Barbara G. Fallon, Stephanie Tuttle, E Frei,
Abstract At the Dann‐Farber Cancer Institute Head and Neck Cancer Clinic, 114 previously untreated patients with advanced squamous cell carcinoma of the head and neck (17% stage III; 83% stage IV) were managed with induction chemotherapy using cis‐platinum, bleomycin, and methotrexate, followed by definitive extirpative surgery and/or radiation therapy. The present report evaluates this group from a surgical and surgical pathology standpoint. The following aspects are evaluated: 1. predictability ...
Tópico(s): Reconstructive Surgery and Microvascular Techniques
1986 - Wiley | The Laryngoscope
Géraldine Engels, Johannes Förster, Andrea Streng, Viktoria Rücker, Paul Rudolph, Franziska Pietsch, Julia Wallstabe, Lars Wallstabe, Maike Krauthausen, Julia Schmidt, Timo Ludwig, Carsten Bauer, David Gierszewski, Jesper Bendig, Sandra Timme, Thomas Jans, Benedikt Weißbrich, Marcel Romanos, Lars Dölken, Peter U. Heuschmann, Christoph Härtel, Ildikó Gágyor, Marc Thilo Figge, Johannes G. Liese, Oliver Kurzai, Annsophie Amman, Anastasia Besenfelder, Leonie Bode, I Enders, Thiemo Frank, Kathrin A. Frei, Greta Habersack, Viktoria Hamway, Theresa Höferth, Thiên-Trí Lam, Sabrina Mündlein, Konstanze Rauch, Christoph Schoen, Timo Spannagel, Fabian Rothbauer, Marianna Abert, Julia Bley, Tatjana Durnev, Carolin Glatzle, Antonia Hardung, Katharina Karch, Sebastian Kollert, Tanja Mastorakis, Lena Schregelmann, Victoria Sokalski, Eva-Lotta Tanzberger, Anne Thieme, Denise Yilmaz, Stefan Zimmerling, Pauline Nehm, Max Siegl, Brigitte Wehner, Kerstin Knies, Rebecca J. Richter, Hülya Düber, Monika Kraft, C Schuchardt, Barbara Finkenberg, J. C. Low,
Importance Closure of day care centers (DCCs) to contain the COVID-19 pandemic has been associated with negative effects on children’s health and well-being. Objective To investigate the acceptance of self-sampling methods for continuous SARS-CoV-2 surveillance among asymptomatic children and childcare workers (CCWs) in DCCs. Design, Setting, and Participants This nonrandomized pilot study included children and CCWs at 9 DCCs in Wuerzburg, Germany, from May to July 2021. Interventions Twice weekly ...
Tópico(s): SARS-CoV-2 and COVID-19 Research
2022 - American Medical Association | JAMA Network Open
Erin West, Daniela Anker, Rebecca Amati, Aude Richard, Ania Wisniak, Audrey Butty, Emiliano Albanese, Murielle Bochud, Arnaud Chioléro, Luca Crivelli, Stéphane Cullati, Valérie D’Acremont, Adina Mihaela Epure, Jan Fehr, Antoine Flahault, Luc Fornerod, Irène Frank, Anja Frei, Gisela Michel, Semira Gonseth, Idris Guessous, Medea Imboden, Christian R. Kahlert, Marco Kaufmann, Philipp Köhler, Nicolai Mösli, Daniel H. Paris, Nicole Probst‐Hensch, Nicolas Rodondi, Silvia Stringhini, Thomas Vermes, Fabian Vollrath, Milo A. Puhan,
Abstract Objectives Seroprevalence studies to assess the spread of SARS-CoV-2 infection in the general population and subgroups are key for evaluating mitigation and vaccination policies and for understanding the spread of the disease both on the national level and for comparison with the international community. Methods Corona Immunitas is a research program of coordinated, population-based, seroprevalence studies implemented by Swiss School of Public Health (SSPH+). Over 28,340 participants, randomly ...
Tópico(s): COVID-19 Clinical Research Studies
2020 - Springer Science+Business Media | International Journal of Public Health
Johannes Förster, Andrea Streng, Paul Rudolph, Viktoria Rücker, Julia Wallstabe, Sandra Timme, Franziska Pietsch, Katrin Hartmann, Maike Krauthausen, Julia Schmidt, Timo Ludwig, David Gierszewski, Thomas Jans, Géraldine Engels, Benedikt Weißbrich, Marcel Romanos, Lars Dölken, Peter U. Heuschmann, Christoph Härtel, Ildikó Gágyor, Marc Thilo Figge, Oliver Kurzai, Johannes G. Liese, Anastasia Besenfelder, Lena Buechner, Kathrin A. Frei, Theresa Höferth, Thiên-Trí Lam, Sabrina Mündlein, Christoph Schoen, Alexandra Schubert‐Unkmeir, Lars Wallstabe, Kerstin Knies, Rebecca J. Richter, Abdullah Almamy, Maxi Bettkober, Viktoria Engert, Phillipp Fecher, J. Fischer, Robin Khan, Fabian Kleindiek, Mirja Müller, Lara Müller-Scholden, Pauline Nehm, J Rapp, Christina Pfann, Maria Riedmeier, George Robinson, Sarah Schnee, A. Sieg, Max Siegl, Fumi Sugihara, Anne Thieme, Gvantsa Uturgaidze, Brigitte Wehner,
Importance Closure of day care centers has been implemented globally to contain the COVID-19 pandemic but has negative effects on children's health and psychosocial well-being. Objective To investigate the feasibility of surveillance among children and childcare workers and to model the efficacy of surveillance on viral spread prevention. Design, Setting, and Participants This nonrandomized controlled trial was conducted at 9 day care centers in Wuerzburg, Germany, from October 2020 to March 2021. Participants ...
Tópico(s): COVID-19 and Mental Health
2022 - American Medical Association | JAMA Network Open
Benjamin Gilfedder, Hannelore Waska, Fabian Wismeth, Sven Frei,
The flux of water, nutrients, carbon and salt through the subsurface at the land-sea interface is an important control on coastal nutrient processes, salinization of coastal aquifers and carbon balances of the coastal zone. However, these fluxes are often spatially and temporally complex and difficult to quantify, especially in high-energy mesotidal systems. Here we use vertical temperature profiles along a morphologically complex mesotidal high-energy beachface to map and quantify water infiltration ...
Tópico(s): Geology and Paleoclimatology Research
2021 - Elsevier BV | Estuarine Coastal and Shelf Science
Thomas J. Ervin, Ralph R. Weichselbaum, Richard L. Fabian, D. Miller, Colleen M. Norris, Marshall R. Posner, Christopher M. Rose, Peter B. Lockhart, Stephanie Tuttle, John Macintyre, E Frei,
• Between Oct 1, 1979 and Aug 1, 1982, 93 patients with advanced squamous carcinoma of the head and neck were given neoadjuvant treatment with cisplatin, bleomycin sulfate, and methotrexate before standard local treatment. Ninety-three patients were evaluable for response. The response rates were as follows: complete response, 24%; partial response, 64%; and no response, 12%. Differences in primary tumor site, performance status at presentation, histologic grade, and tumor size did not correlate with response ...
Tópico(s): Head and Neck Surgical Oncology
1984 - American Medical Association | Archives of Otolaryngology - Head and Neck Surgery
Fabian Frei, Juraj Hromkovič, Juhani Karhumäki,
It is well known that the set of powers of any given order, for example squares, in a regular language need not be regular. Nevertheless, finite automata can identify them via their roots. More precisely, we recall that, given a regular language L, the set of square roots of L is regular. The same holds true for the nth roots for any n and for the set of all nontrivial roots; we give a concrete construction for all of them. Using the above result, we obtain decision algorithms for many natural problems ...
Tópico(s): Advanced Algebra and Logic
2020 - IOS Press | Fundamenta Informaticae
Kohei Otaka, Fabian Frei, Koichi Wada,
Tópico(s): Advanced Manufacturing and Logistics Optimization
2024 - Springer Science+Business Media | Lecture notes in computer science