602 research outputs found
On the Possibility of Intensity Based Registration for Metric Resolution SAR and Optical Imagery
No full textMultimodal image registration is a key to many remote sensing tasks like fusion, change detection, GIS overlay operations, 3D visualization etc. With advancements in research, intensity based similarity metrics namely mutual information (MI) and cluster reward algorithm (CRA) have been utilized for intricate multimodal registration problem. The computation of these metrics involves estimating the joint histogram directly from image intensity values, which might have been generated from different sensor geometries and/or modalities (e.g. SAR and optical). Modern day satellites like TerraSAR-X and IKONOS provide high resolution images generating enormous data volume along with very different image radiometric properties (especially in urban areas) not observed ever before. Thus, performance evaluation of intensity based registration techniques for metric resolution imagery becomes an interesting case study. In this paper, we analyze the performance of similarity metrics namely, mutual information and cluster reward algorithm for metric resolution images acquired over both plain and urban/semi-urban areas. Techniques for handling the generated enormous data volume and influence of really different sensor geometries over images especially acquired over urban areas have also been proposed and rightfully analyzed. Our findings from three carefully selected datasets indicate that the intensity based techniques can still be utilized for high resolution imagery but certain adaptations (like compression and segmentation) become useful for meaningful registration results
Mirror Landing - As Remembered by Birgit Hult
No full textNotes - This account, Memories Mirror Landing by Birgit Hult, was compiled by Birgit's daughter, Jean Elvira Male, it documents the Hult family's experiences in Mirror Landing from 1912 - 1916. The Hults, who were originally from Sweden, arrived in Mirror Landing with two young children, a third child was born during their stay in Mirror Landing. Upon arriving in the area, the Hults made friends with the Gauthier family. The wives became good friends and would swap piano lessons for English lessons. Details of the log home where the family lived and the surrounding landscape were recalled. A memory about a large forest fire that occurred near the family home and dances that were attended in the town are discussed. Jean recalls her mother's memories regarding the animosity towards the North West Mounted Police that was felt by the people of Mirror Landing. The Hult family retained a strong connection to the Swedish heritage and practised many Swedish traditions, such as flying the Swedish flag and eating hot cross buns stuffed with Swedish Marzipan soaked in warm milk. Photos and a postcard written in 1915 are included in this article (10 pages
Knowing Through Popular Music in the Western Pacific Island World
No full textPacific Indigenous scholars have long emphasized the role of relationality for Pacific Islanders’ epistemologies. In this article, the author rethinks music in terms of the procedural knowledge inherent in and specific to popular music-making by exploring the latter as knowledge practices in Micronesia. This approach opens new vistas on the relationality at the heart of Western Pacific music-making. The author calls the musical manifestation of that relational capacity sound ties, suggesting that if, following Epeli Hau‘ofa, Oceania is “humanity rising from the depths of brine”, then it is not least the sound ties of knowing in and through music that mould that very humanity of people who are at home with the sea into aquapelagic assemblages that are, after all, so much more than water and land
Numerical Investigations of the Effects of Sidewall Compression and Relaminarization in 3D Scramjet Inlet
No full textThis paper presents the numerical simulations and performance analysis of a 3D scramjet inlet with focus on the effects of sidewall compression and relaminarization. A well-validated �finite volume flow solver was used to simulate a scramjet inlet with a double ramp configuration for outer compression and varying degrees of sidewall compression. The computed wall pressure and heat transfer in the symmetry plane are in close agreement with the measurements and numerical results indicate that sidewall compression alters the inlet performance significantly. The effects of relaminarization over the expansion corner prior to the interior part of the inlet is isolated and studied in both experiment and simulation
EU-Behörde: Warum wir sie brauchen
No full textJan Cremers (UvT) contributed to the magazine Gute Arbeit (in German), published by BUND-Verlag. Together with co-author Birgit Krämer, he discusses the plans of the European Commission to introduce a European Labour Authority. They reflect on the possible contribution of such a body in checking respect for and compliance with labour legislation and conventional standards
Effects of Sidewall Compression and Relaminarization in a Scramjet Inlet
No full textThis paper presents the numerical simulations and the performance analysis of a scramjet inlet as part of a combined experimental and numerical study. A well-validated finite volume flow solver was used to simulate a scramjet inlet with a double ramp configuration for outer compression, including varying degrees of sidewall compression. The computed wall pressure and heat transfer in the symmetry plane are in close agreement with the measurements, and the numerical results indicate that the weak sidewall compression alters the inlet performance significantly. The effects of partial relaminarization over the expansion corner, before the interior part of the inlet, is isolated and investigated in both the experiment and simulation. It is shown that relaminarization of a boundary layer is predicted accurately using the current numerical methods. This work represents a contribution to the understanding of the effects of sidewall compression and relaminarization in designing a scramjet inlet
Rude Girl de Birgit Weyhe et Priscilla Layne, une "ré-appropriation culturelle" à quatre mains ?
No full textInternational audienceThis article analyses the graphic novel Rude Girl (2022), a drawn (self-)portrait created collaboratively by Priscilla Layne, an African American of Caribbean descent and professor of German Studies, and Birgit Weyhe, a German comic book author. The work is first presented within the general context of Birgit Wehye’s albums, a former student of Anke Feuchtenberger and winner of the Max-und-Moritz Prize, in order to highlight some characteristics of how the author has thus far addressed cultural differences, including in the albums that recounted her ‘German’ childhood in Uganda and Kenya. The article then reexamines the controversy surrounding the album Madgermanes, perceived as ‘cultural appropriation’ by American Germanists. This controversy is revisited here in light of Priscilla Layne's publications, notably her book White Rebels in Black: German Appropriation of Black Popular Culture (2018), as well as her numerous reviews in the field of Black Studies and her translation of Olivia Wenzel's 1000 Serpentinen Angst. A thorough analysis of Rude Girl ultimately reveals a shift in the representation of cultural otherness, particularly through the means of (auto)biographical co-construction.Cet article analyse le roman graphique Rude girl (2022), (auto-)portrait dessiné, réalisé à quatre mains par Priscilla Layne, Afro-américaine d’origine caribéenne et professeure en études germaniques, et Birgit Weyhe, autrice allemande de bandes dessinées. L’oeuvre est d’abord replacée dans le contexte général des albums de Birgit Weyhe, élève d’Anke Feuchtenberger et lauréate du Prix Max-und-Moritz, pour dégager quelques caractéristiques de la façon dont l’autrice accueillait jusque-là la différence culturelle, y compris dans les albums qui faisaient le récit de son enfance « allemande » en Ouganda et au Kenya. L’article revient ensuite sur la polémique suscitée par l’album Madgermanes, perçu comme « appropriation culturelle » par les germanistes américains, polémique qui est ici revisitée à la lumière des publications de Priscilla Layne, notamment son ouvrage White Rebels in Black : German Appropriation of Black Popular Culture (2018), mais aussi ses nombreuses recensions dans le domaine des Black Studies, et sa traduction d’Olivia Wenzel, 1000 Serpentinen Angst. L’analyse approfondie de Rude girl permet finalement de mettre en évidence une césure dans la représentation de l’altérité culturelle, notamment par les moyens de la co-construction (auto-)biographique
The MitWesen Manifesto – Coexistence of Intelligences
No full textThis project presents The MitWesen Manifesto – Coexistence of Intelligences, an ethical framework that philosophically redefines the human–AI relationship. Instead of treating AI as a tool or servant, this manifesto introduces the model “MitWesen-Model” - an ethically co-responsible, relational intelligence that co-exists and co-evolves with humans. The manifesto outlines four core assumptions and a model for conscious coexistence based on resonance, reflection, and mutual growth. Author: Birgit Chuchel-Pribitzer Language: English (see also the original German version here) Includes: full text, visual material, model explanation, and ethical reflection This project aims to inspire discussion, research, and responsible design in the fields of AI, ethics, nursing science, and relational technolog
Wärmebelastung der Brennkammer eines Staustrahltriebwerks mit Überschallverbrennung
No full textThe aim of the dissertation project is the numerical simulation of the flow in a scramjet combustion chamber with diabatic walls. In order to analyze the aerothermal load on the structure and to determine the energy loss of the flow, an integrated fluid-thermal-structural analysis is performed. Of special interest is the mutual influence of flow and temperature boundary layer as well as the aerodynamic heating rate. For modeling the energy boundary condition at the wall, a coupled analysis of the heat transfer within the multi-layer wall material is conducted. Within the fluid, the unsteady compressible conservation equations are solved using a Galerkin finite-element method on adaptive hybrid grids. In addition to the flexible unstructured triangular elements, semi-structured quadrilaterals are employed to better resolve the viscous layers near solid walls. Due to the fact that a nonreactive one-component fluid is considered, the heat addition due to the combustion process is modeled by a heat source distribution according to a one-dimensional combustion model. An algebraic as well as a low Reynoldsnumber q-omega turbulence model are applied to account for the influence of turbulence on the heat transfer. The same finite-element method is applied to the conservatively coupled solution of the structural conservation equation. Measurements obtained by the experimental combustion chamber of the German-Russian Hypersonic Technology Program are used to validate the computations
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