Model-based Optimization of Compressive Antennas for High-Sensing-Capacity Applications

This paper presents a novel, model-based compressive antenna design method for high sensing capacity imaging applications. Given a set of design constraints, the method maximizes the sensing capacity of the compressive antenna by varying the constitutive properties of scatterers distributed along the antenna. Preliminary 2D design results demonstrate the new method's ability to produce antenna configurations with enhanced imaging capabilities

Pressure dependence of phase transitions in the quasi one-dimensional metal-insulator transition system beta-Na1/3V2O5

The pressure dependence of phase transitions in the quasi one-dimensional vanadium oxide $\beta$-Na$_{1/3}$V$_2$O$_5$ has been studied by magnetic susceptibility and electrical resistivity measurements. The pressure dependence of the various transition temperatures is quite differently. The transition at T=240 K, previously reported and attributed to ordering on Na sites, and a second transition at $T \approx 222$ K, reported here for the first time and attributed to a further increase of order on Na sites, are almost independent of pressure. On the other hand, the metal-insulator (MI) transition at $T_{MI}=130$ K shifts to lower temperatures, while the magnetic transition at $T_N=24$ K shifts to higher temperatures with increasing pressure. We discuss the different pressure dependencies of $T_{MI}$ and $T_N$ in terms of increasing interchain coupling and the MI transition to be of Peierls type.Comment: 5 pages, 5 figure

Stadtansichten von Kiel in der Druckgraphik vom 16. bis 18. Jahrhundert

Der Beitrag behandelt die Tradition der Abbildungen von Kiel in der Druckgraphik vom 16. bis zum 18. Jahrhundert. Die damals lateinisch als Chilonium bezeichnete Stadt wurde erstmals von Braun-Hogenberg in den Civitates orbis terrarum 1588 abgebildet. Wir sind hier in der Lage, die Beschaffung des ikonographischen Materials nachvollziehen zu können. Braun stand in Briefkontakt mit dem in Kiel wirkenden Politiker und Gelehrten Heinrich Graf Rantzau, der einem in Hamburg wirkenden Graphiker, Johann Greve, 1585 den Auftrag zu einer Abbildung erteilte. Dieses später von Braun zwar verworfene, aber in Grundzügen dennoch kopierte Blatt ist in Rantzaus Handexemplar der Braun-Hogenbergschen Sammlung (heute Stadtbibliothek Augsburg) erhalten. Die diesbezüglichen Briefe zwischen Braun und Rantzau sind erhalten. Alle späteren Abbildungen bis ins 18. Jahrhundert sind direkte Derivate dieser Abbildung, wobei an künstlerischer Qualität nur die von Matthäus Merian (in Werdenhagens De rebus publicis Hanseaticis tractatus, Frankfurt 1641) hervorzuheben ist. Außer zwei kurzen Stadtansichten auf einer Karte im 18. Jahrhundert (Homanns Erben vor 1742) ist keine realistische Abbildung der Stadt vor Ort in der Druckgraphik festzustellen. Die außerhalb der Druckgraphik erhaltenen Werke wie ein Ölbild und wenige Karten sind nur sehr wenige

Scalable Robotic Intra-Logistics with Answer Set Programming

Over time, Answer Set Programming (ASP) has gained traction as a versatile logic programming semantics with performant processing systems, used by a growing number of significant applications in academia and industry. However, this development is threatened by a lack of commonly accepted design patterns and techniques for ASP to address dynamic application on a real-world scale. To this end, we identified robotic intra-logistics as representative scenario, a major domain of interest in the context of the fourth industrial revolution. For this setting, we aim to provide a scalable and efficient ASP-based solutions by (1) stipulating a standardized test and benchmark framework; (2) leveraging existing ASP techniques through new design patterns; and (3) extending ASP with new functionalities. In this paper we will expand on the subject matter as well as detail our current progress and future plans

Searching for hot Jupiter transits around cool stars

In this thesis, I describe the search for transiting hot Jupiters with a focus on cool dwarfs, low-mass main-sequence stars. I detail the results of our Pan-Planets survey and the necessary follow-up and show a discovered planet in the Beehive cluster M44, a transiting hot Neptune around an M dwarf. Finally, I evaluate our results in the context of planet occurrence rate and demonstrate that we set more precise limits for hot Jupiters in M dwarf systems than other projects before us.Deutsche Übersetzung des Titels: Die Suche nach heißen Jupiter-Transits um kühle Stern