Concept
Compact space
Related publications (146)
Optimal control for power generating kites
Numerical solutions for optimal power generation in a pumping power cycle for Airborne Wind Energy is presented. The problem is essentially an infinite horizon optimal control problem which is then attempted to solve by three methods, finite time horizon a ...
2014Mid-infrared spectroscopy for gases and liquids based on quantum cascade technologies
Nico de Rooij, Hans Peter Herzig, Jérôme Faist, Lubos Hvozdara, Philip Wägli, Yu-Chi Chang
In this paper we present two compact, quantum cascade laser absorption spectroscopy based, sensors developed for trace substance detection in gases and liquids. The gas sensor, in its most integrated version, represents the first system combining a quantum ...
Royal Soc Chemistry2014Comparison of HIPIMS sputtered Ag- and Cu-surfaces leading to accelerated bacterial inactivation in the dark
César Pulgarin, Juan Kiwi, Sami Rtimi, Oualid Baghriche
Recently, compact uniform and adhesive films of Ag and Cu have been prepared by DC-magnetron sputtering (DC), pulsed DC magnetron sputtering (DCP) and high power impulse magnetron sputtering (HIPIMS). This study reports the HIPIMS deposition for Ag and Cu ...
Elsevier Science Sa2014Homogeneous number of free generators
We address two questions of Simon Thomas. First, we show that for any n >= 3 one can find a four-generated free subgroup of SLn (Z) which is profinitely dense. More generally, we show that an arithmetic group Gamma that admits the congruence subgroup prope ...
Walter De Gruyter Gmbh2014Sequences with Minimal Time-Frequency Spreads
Martin Vetterli, Reza Parhizkar, Yann Barbotin
For a given time or frequency spread, one can always find continuous- time signals, which achieve the Heisenberg uncertainty principle bound. This is known, however, not to be the case for discrete-time sequences; only widely spread sequences asymptoticall ...
Ieee2013Euclidean Distance Matrices
Euclidean distance matrices (EDMs) are central players in many diverse fields including psychometrics, NMR spectroscopy, machine learning and sensor networks. However, they are not often exploited in signal processing. In this thesis, we analyze attributes ...
EPFL2013Sparse Binary Features for Image Classification
In this work a new method for automatic image classification is proposed. It relies on a compact representation of images using sets of sparse binary features. This work first evaluates the Fast Retina Keypoint binary descriptor and proposes imp ...
2013Non-Supramenable Groups Acting On Locally Compact Spaces
Nicolas Monod, Julian Kellerhals
Supramenability of groups is characterised in terms of invariant measures on locally compact spaces. This opens the door to constructing interesting crossed product C*-algebras for non-supramenable groups. In particular, stable Kirchberg algebras in the UC ...
Univ Bielefeld2013Normal generation of locally compact groups
Nicolas Monod, Amichai Netanel Eisenmann
It is a well-known open problem since the 1970s whether a finitely generated perfect group can be normally generated by a single element or not. We prove that the topological version of this problem has an affirmative answer as long as we exclude infinite ...
Oxford Univ Press2013