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High-precision signal processing algorithm to evaluate SAW properties as a function of temperature (2013)
Shrena, Ismail ; Eisele, David ; Bardong, Jochen ; Mayer, Elena ; Reindl, Leonhard Michael
This paper presents a signal processing algorithm which accurately evaluates the SAW properties of a substrate as functions of temperature. The investigated acoustic properties are group velocity, phase velocity, propagation loss, and coupling coefficient. With several measurements carried out at different temperatures, we obtain the temperature dependency of the SAW properties. The analysis algorithm starts by reading the transfer functions of short and long delay lines. The analysis algorithm determines the center frequency of the delay lines and obtains the delay time difference between the short and long delay lines. The extracted parameters are then used to calculate the acoustic properties of the SAW material. To validate the algorithm, its accuracy is studied by determining the error in the calculating delay time difference, center frequency, and group velocity.
Innovation: Under Cover: Synthetic-Aperture GNSS Signal Processing (2013)
Pany, Thomas ; Falk, Nico ; Riedl, Bernhard ; Stöber, Carsten ; Winkel, Jón O. ; Schimpl, Franz-Josef
Researchers are developing new GNSS receivers and antennas based on an innovative signal-processing scheme to significantly improve GNSS tracking reliability and accuracy under degraded signal conditions. It is based on the principles of synthetic-aperture radar. Like in a multi-antenna phased array receiver, GNSS signals from different spatial locations are combined coherently forming an optimized synthetic antenna-gain pattern. The method is implemented in a real-time PC-based software receiver and works with GPS, GLONASS, and Galileo signals. Multiple frequencies are generally supported. The idea of synthetic-aperture processing is realized as a coherent summation of correlation values of each satellite over the so-called beamforming interval. Each correlation value is multiplied with a phase factor. For example, the phase factor can be chosen to compensate for the relative antenna motion over the beam-forming interval and the resulting sum of the scaled correlation values represents a coherent correlation value maximizing the line of sight signal power.
Communication solutions for a cloud-based charging management system for a fleet of shared-use electric vehicles (2013)
Mierau, Michael ; Fey, Simon ; Kohrs, Robert ; Wittwer, Christof
The paper proposes a system architecture for charging infrastructure that serves the requirements of future fleets of shared-use electric vehicles in urban scenarios. The focus of the development is on the interfaces to central stakeholders such as mobility service providers, distribution network operators and utilities. The main concept of the proposed system is the adherence to a stringent resource-oriented design approach, following the design principles of the Representational State Transfer (REST) architectural software style for distributed systems. This design approach is used from the cloud-based services down to the implementation of the charging infrastructure's control algorithms. Focusing on the resources of the various entities simplifies the implementation of their interactions, compared to the explicit declaration of services that are available. The system design ensures that the charging infrastructure is open to all users and generates a benefit beyond basic charging operations. Integration in emerging smart markets is done via open web-based interfaces. These allow for the generation of an added value of concrete services for shared-use electric mobility. A link to the field of grid operation is proposed using the ISO/IEC 61850 telecontrol standard. The smart meter capabilities of the charging stations can be used to gain additional information on the current state of the distribution grid. As an exemplary service a load management service for a fleet of shared-use electric vehicles is going to be implemented.
Left ventricular conduction delay and biventricular pacing delay in cardiac resynchronisation therapy responder and non-responder (2013)
Heinke, Matthias ; Ismer, Bruno ; Kühnert, Helmut ; Gorißen, Bernhard ; Müller, D. ; Dannberg, Gudrun ; Figulla, Hans Reiner
Assessing energy and thermal comfort of different low-energy cooling concepts for non-residential buildings (2013)
Salvalai, Graziano ; Pfafferott, Jens ; Sesana, Marta Maria
Energy consumption for cooling is growing dramatically. In the last years, electricity peak consumption grew significantly, switching from winter to summer in many EU countries. This is endangering the stability of electricity grids. This article outlines a comprehensive analysis of an office building performances in terms of energy consumption and thermal comfort (in accordance with static – ISO 7730:2005 – and adaptive thermal comfort criteria – EN 15251:2007 –) related to different cooling concepts in six different European climate zones. The work is based on a series of dynamic simulations carried out in the Trnsys 17 environment for a typical office building. The simulation study was accomplished for five cooling technologies: natural ventilation (NV), mechanical night ventilation (MV), fan-coils (FC), suspended ceiling panels (SCP), and concrete core conditioning (CCC) applied in Stockholm, Hamburg, Stuttgart, Milan, Rome, and Palermo. Under this premise, the authors propose a methodology for the evaluation of the cooling concepts taking into account both, thermal comfort and energy consumption.
Electrode Reoxidation in Solid-Oxide Cells: Detailed Modeling of Nickel Oxide Film Growth (2013)
Neidhardt, Jonathan Philipp ; Kee, Robert J. ; Bessler, Wolfgang G.
A Highly Scalable IEEE802.11p Subsystem Using Communication and Localization for Increased Vehicular Safety (2013)
Sikora, Axel ; Schappacher, Manuel
Near-infrared spectroscopy for real-time brain perfusion diagnostics in patients with late whiplash syndrome (2013)
Otte, Andreas ; Neculae, Adrian ; Curticapean, Dan
Nicht-ionisierende Diagnostik bei Fremdkörperingestion (2013)
Otte, Andreas ; Kiefer, Michael ; Brudsche, Markus
The Challenges of Collaborative Learning in Cloud and a Three Layered Architecture Towards the Solution (2013)
Marepalli, Sai Manoj ; Sultana, Razia ; Christ, Andreas
Computed tomography alone reveals the secrets of ancient mummies in medical archaeology (2013)
Otte, Andreas ; Thieme, Tobias ; Beck, Andreas
Development of Car2X Communication and Localization PHY and MAC Protocol Following Iterative Spiral Model Using Simulation and Emulation (2013)
Sikora, Axel ; Lill, Dirk ; Schappacher, Manuel ; Gutjahr, Simon ; Gerber, Eugen
Spatiotemporal simulation of nickel oxide and carbon phases formation in solid oxide fuel cells (SOFC) (2013)
Neidhardt, Jonathan Philipp ; Yurkiv, Vitaliy ; Bessler, Wolfgang G.
Die Krankheiten des Niccolò Paganini – ein Genie durch Krankheit? (2013)
Oswald, Johanna ; Großkinsky, Maresa ; Otte, Andreas
Spectral observation of fuel additives in gasoline-ethanol blends using a Fourier-transform Raman spectrometer prototype (2013)
Ortega Clavero, Valentin ; Weber, Andreas ; Schröder, Werner ; Javahiraly, Nicolas ; Meyrueis, Patrick L.
Is there an influence of subclinical epileptic EEG patterns on reaction time of epilepsy patients? : A pilot study (2013)
Muschter, Jonas ; Otte, Andreas ; Steinhoff, Bernhard ; Kurth, Christoph
Weltraummedizin : Alterssimulationsanzüge einsetzen (2013)
Otte, Andreas
M2M Best Practice Award 2012 - Innovation (2013)
Sikora, Axel
Auf dem Vormarsch: Der Wireless M-Bus (2013)
Sikora, Axel
Design, Simulation, and Verification of Highly Portable and Flexible Communication Stacks for Automatic Meter Reading (AMR) (2013)
Sikora, Axel
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