11,572 Works

Modellierung von Wärmeübertragern in den Gaswechselsystemen von Verbrennungsmotoren

Achim Lechmann
In modernen Fahrzeugen finden sich zahlreiche Wärmeübertrager unterschiedlicher Bauform und für unterschiedliche Medien. Im Rahmen von Konstruktion und Entwicklung ist für eine differenziertere Bewertung, als es die Betrachtung des Gesamtsystems ermöglicht, die Kenntnis der Wärmeübergangskoeffizienten der jeweiligen Wärmeübertragerflächen vorteilhaft. Auch bei Berechnungen, wie beispielsweise der Simulation von Wärmeübertragern, können mit Hilfe der Wärmeübergangskoeffizienten Vorteile erzielt werden. Die Datenbasis für diese Arbeit bilden die Messwerte von 14 Ladeluftkühler-Prototypen, die an dem Wärmetauscherprüfstand der Forschungsstelle im Rahmen...
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Development of an Electromyography Detection System for the Control of Functional Electrical Stimulation in Neurological Rehabilitation

Raafat El-Sayed Shalaby
Der Schlaganfall stellt die häufigste Ursache für neurologische Beeinträchti­gungen dar. Im Rahmen der neurologischen Rehabilitation kann durch wiederholtes Üben das Gehirn aufgrund seiner „Plastizität“ verloren gegangene motorische Funktionen neu erlernen. Noch verbliebene schwache willkürliche Muskelaktivitäten können mittels Elektromyographie (EMG) erfasst werden. Die teilweise gelähmten Muskeln können des Weiteren durch Anwendung einer Funktionellen Elektrostimulation (FES) zusätzlich künstlich aktiviert werden. Bei den meisten existierenden FES-Systemen erfolgt die Aktivierung der FES manuell. Um die Bewegungsintention des Patienten im...
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Multi-Variate EEG Analysis as a Novel Tool to Examine Brain Responses to Naturalistic Music Stimuli

Irene Sturm, Sven Dähne, Benjamin Blankertz & Gabriel Curio
Note onsets in music are acoustic landmarks providing auditory cues that underlie the perception of more complex phenomena such as beat, rhythm, and meter. For naturalistic ongoing sounds a detailed view on the neural representation of onset structure is hard to obtain, since, typically, stimulus-related EEG signatures are derived by averaging a high number of identical stimulus presentations. Here, we propose a novel multivariate regression-based method extracting onset-related brain responses from the ongoing EEG. We...
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Large-Scale Assessment of a Fully Automatic Co-Adaptive Motor Imagery-Based Brain Computer Interface

Laura Acqualagna, Loic Botrel, Carmen Vidaurre, Andrea Kübler & Benjamin Blankertz
In the last years Brain Computer Interface (BCI) technology has benefited from the development of sophisticated machine leaning methods that let the user operate the BCI after a few trials of calibration. One remarkable example is the recent development of co-adaptive techniques that proved to extend the use of BCIs also to people not able to achieve successful control with the standard BCI procedure. Especially for BCIs based on the modulation of the Sensorimotor Rhythm...
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Synthese des carbazyklischen A-Rings von Labyrinthopeptin A2, eines ribosomal synthetisierten Typ III-Lantibiotikums

Georg M. Sambeth
Die vorliegende Arbeit beschäftigt sich mit Studien zur Totalsynthese von Labyrinthopeptin A2. Das Typ III-Lantibiotikum wurde 1988 zusammen mit den Varianten A1 und A3 aus dem Kulturüberstand des Actinomyceten Actinomadura namibiensis isoliert, einem Bakterium, welches von der früheren Hoechst AG in einer Bodenprobe aus der Wüste Namibias entdeckt wurde. Die Labyrinthopeptine weisen eine einzigartige, unter Lantibiotika bisher unbekannte Molekülarchitektur auf. Die globulären Strukturen besitzen jeweils fünf Ringe: die carbazyklischen Ringe A und A„, die Lanthioninringe...
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Konzeption eines Organisations- und Kooperations-Leitsystems mit anreizbasierten Vergütungselementen zur Verbesserung der Kooperation, der Kommunikation und der Termineinhaltung in Bauprojekten

John-Albert Giebelhausen
Gedruckt erschienen im Universitätsverlag der TU Berlin, ISBN 978-3-7983-3092-4 (ISSN 1610-0158)
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Health technology assessment of medical devices in europe: processes, practices, and methods

Sabine Fuchs, Britta Olberg, Dimitra Panteli & Reinhard Busse
Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG geförderten) Allianz- bzw. Nationallizenz frei zugänglich.
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Audibility and Interpolation of Head-Above-Torso Orientation in Binaural Technology

Fabian Brinkmann, Reinhild Roden, Alexander Lindau & Stefan Weinzierl
Head-related transfer functions (HRTFs) incorporate fundamental cues required for human spatial hearing and are often applied to auralize results obtained from room acoustic simulations. HRTFs are typically available for various directions of sound incidence and a fixed head-above-torso orientation (HATO). If-in interactive auralizations-HRTFs are exchanged according to the head rotations of a listener, the auralization result most often corresponds to a listener turning head and torso simultaneously, while-in reality-listeners usually turn their head independently above...
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A High Resolution and Full-Spherical Head-Related Transfer Function Database for Different Head-Above-Torso Orientations

Fabian Brinkmann, Alexander Lindau, Stefan Weinzierl, Steven Van De Par, Markus Müller-Trapet, Rob Opdam & Michael Vorländer
Head-related transfer functions (HRTFs) capture the free-field sound transmission from a sound source to the listeners ears, incorporating all the cues for sound localization, such as interaural time and level differences as well as the spectral cues that originate from scattering, diffraction, and reflection on the human pinnae, head, and body. In this study, HRTFs were acoustically measured and numerically simulated for the FABIAN head-and-torso simulator on a full-spherical and high-resolution sampling grid. HRTFs were...
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Review of Life Cycle Sustainability Assessment and Potential for Its Adoption at an Automotive Company

Peter Tarne, Marzia Traverso & Matthias Finkbeiner
The aim of this paper is to guide the next steps of a PhD thesis through a structured review of the state of the art and implementation of Life Cycle Sustainability Assessment (LCSA), and to identify challenges and potentials for its adoption at an automotive company. First, the structured literature review was conducted on LCSA to screen the current methodological and practical implementations and to identify the main research needs in the field. Second, a...
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Gesetzliche Mengensteuerung stationärer Leistungen - Krankenhausabrechnungsdaten als empirische Grundlage zur Analyse mengenanfälliger und nicht mengenanfälliger Leistungen

Melissa Spoden
Hintergrund: Mit Einführung der fallpauschalierenden Diagnosis Related Groups (DRG) im Jahr 2003 wurde die bis dahin bestehende Kostenorientierung des deutschen Vergütungssystems von einer Leistungsorientierung abgelöst. Das DRG-System zielt mit seinen Anreizwirkungen auf eine effizientere Erbringung der Leistungen und ermöglicht gleichzeitig Leistungsverlagerungen zwischen den Kliniken. Neben solchen beabsichtigten Mengenveränderungen werden jedoch auch Tendenzen zur Über- und Fehlversorgung bzw. Indikationsausweitung vermutet, welche dem Grundsatz der Bedarfsgerechtigkeit (§ 70 SGB V) im gesetzlichen Gesundheitssystem widersprechen. Mit dem Krankenhausstrukturgesetz...
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Binaural processing for the evaluation of acoustical environments

Fabian Brinkmann
The main concern of this work is binaural processing for acoustical environments, and the evaluation of room acoustical simulations against the corresponding real sound fields. For this purpose the real sound fields and the simulations were virtualized by means of binaural synthesis - a method that aims at reproducing the sound pressure signals at the listener's ear drums. Before the comparison could be achieved, the performance of binaural synthesis was analyzed, and the input data...
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A round robin on room acoustical simulation and auralization

Fabian Brinkmann, Lukas Aspöck, David Ackermann, Steffen Lepa, Michael Vorländer & Stefan Weinzierl
A round robin was conducted to evaluate the state of the art of room acoustic modeling software both in the physical and perceptual realms. The test was based on six acoustic scenes highlighting specific acoustic phenomena and for three complex, “real-world” spatial environments. The results demonstrate that most present simulation algorithms generate obvious model errors once the assumptions of geometrical acoustics are no longer met. As a consequence, they are neither able to provide a...
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On the authenticity of individual dynamic binaural synthesis

Fabian Brinkmann, Alexander Lindau & Stefan Weinzierl
A simulation that is perceptually indistinguishable from the corresponding real sound field could be termed authentic. Using binaural technology, such a simulation would theoretically be achieved by reconstructing the sound pressure at a listener's ears. However, inevitable errors in the measurement, rendering, and reproduction introduce audible degradations, as it has been demonstrated in previous studies for anechoic environments and static binaural simulations (fixed head orientation). The current study investigated the authenticity of individual dynamic binaural...
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A Cognitive Modeling Approach to Strategy Formation in Dynamic Decision Making

Sabine Prezenski, André Brechmann, Susann Wolff & Nele Russwinkel
Decision-making is a high-level cognitive process based on cognitive processes like perception, attention, and memory. Real-life situations require series of decisions to be made, with each decision depending on previous feedback from a potentially changing environment. To gain a better understanding of the underlying processes of dynamic decision-making, we applied the method of cognitive modeling on a complex rule-based category learning task. Here, participants first needed to identify the conjunction of two rules that defined...
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From Sprites to Global Motion Temporal Filtering

Andreas Krutz
Videocodierungstechniken haben sich über die letzten Jahrzehnte sehr stark entwickelt. Seit die digitale Videoverarbeitung und -übertragung die analoge Technik abgelöst hat, ist die Komprimierung von Videodaten vor der Übertragung ein sehr wichtiger Bestandteil der gesamten Prozesskette der Videoübertragung. Dabei kamen zusätzlich zu den schon vorhandenen Systemen, wie normale TV-Übertragung und Speichermedien wie DVD oder Bluray-Disk, nun neue Platformen und Geräte, in denen Video angezeigt werden kann dazu. Zwei wichtige Beispiele stellen hier mobile Geräte, wie...
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Zur Evaluationsmethodik für großflächige integrative Naturschutzprogramme - an Beispielen eines brandenburgischen Großschutzgebietes

Dorothee Bader
Die Entwicklung von Erfolgskontrollen und Evaluationen im Naturschutz ging nicht mit der Strategieentwicklung zu großflächigen integrativen Naturschutzprogrammen einher. Daher existieren kaum Methoden, bei thematisch weit gefassten und komplexen Programmen wie den brandenburgischen Großschutzgebieten Wirkung, Zielerreichung und Erfolg zu erfassen. Die sozialwissenschaftliche Evaluationsforschung bietet zwar Grundlagen, aber keine direkt übertragbaren Lösungen. Ausgehend von der bestehenden Evaluationsforschung wurde zunächst ein methodischer Rahmen zum Ablauf von Evaluationen komplexer Naturschutzvorhaben entwickelt (1. Stufe im zweistufigen Aufbau der Methode). Dieser...
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The macroeconomics of interconnected economies

Florian Ramel
Today’s economies are usually not isolated but are closely connected via the processes of globalization. Especially the production of goods and services is not limited to one country anymore, it has rather been internationalized and increasingly takes place in global value chains that span several countries. The study examines the effects of different institutional parameters on global trade flows and economic growth in such interconnected economies. Next to political influence by regulation, special attention is...
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Ampelografia.; 1906

(:Unav)
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Das Herbar; 1892

Moritz Willkomm
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The Hubble PanCET program: an extensive search for metallic ions in the exosphere of GJ 436 b

Leonardo Dos Santos, D. Ehrenreich, V. Bourrier, A. Lecavelier Des Etangs, Mercedes López-Morales, David K. Sing, G. Ballester, Lotfi Ben-Jaffel, Lars A. Buchhave, Antonio García Muñoz, Gregory Henry, T. Kataria, B. Lavie, P. Lavvas, Nikole Lewis, Thomas Mikal-Evans, Jorge Sanz-Forcada & Hannah Wakeford
Context. The quiet M2.5 star GJ 436 hosts a warm Neptune that displays an extended atmosphere that dwarfs its own host star. Predictions of atmospheric escape in such planets state that H atoms escape from the upper atmosphere in a collisional regime and that the flow can drag heavier atoms to the upper atmosphere. It is unclear, however, what astrophysical mechanisms drive the process. Aims. Our objective is to leverage the extensive coverage of observations...
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Making Taste Public: Industrialized Orders of Sensing and the Democratic Potential of Experimental Eating

Jan-Peter Voß & Michael Guggenheim
Existing discussions of food democracy focus on people’s freedom to choose healthy, sustainable, or otherwise ‘good’ foods. Such foods are supposed to be unrestrained by oligopolistic structures of food supply, economic inequality, misinformation, or the misleading lobbying campaigns of the food industry. Our article aims to broaden the discussion about food democracy: focusing on people’s freedom to choose the food they want, but also on people’s freedom to engage with what they eat and how...
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Venus Upper Clouds and the UV Absorber From MESSENGER/MASCS Observations

Santiago Pérez-Hoyos, Agustin Sánchez‐Lavega, Antonio García Muñoz, Patrick G. J. Irwin, Javier Peralta, Gregory Holsclaw, William McClintock & José Francisco Sanz‐Requena
©2018. American Geophysical Union.
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Analysis and development of a monolithic computational approach for fluid–structure interaction by means of the finite element method

Florian Piekny
The phenomenon of fluid–structure interaction (FSI) appears in many engineering applications. Its computation allows to quantify the mechanical behaviour of both fluid and structure interacting with each other. For that purpose, appropriate field equations are specified for an incompressible, viscous fluid and a linear elastic solid. The domain movement is considered by utilizing the arbitrary Lagrangean–Eulerian viewpoint for the fluid equations. Within a monolithic computational approach the fluid and structure equations are solved numerically in...
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Potential vorticity of the south polar vortex of Venus

Itziar Garate‐Lopez, R. Hueso, Agustin Sánchez‐Lavega & Antonio García Muñoz
©2016. American Geophysical Union
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