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Gothenburg, Sweden

Chalmers University of Technology is a Swedish university located in Gothenburg that focuses on research and education in technology, natural science, architecture, maritime and other management areas. Wikipedia.

Andreasson J.,Chalmers University of Technology | Pischel U.,University of Huelva
Chemical Society Reviews | Year: 2015

In this tutorial review, the most recent developments in the field of molecular logic and information processing are discussed. Special emphasis is given to the report of progress in the concatenation of molecular logic devices and switches, the design of memory systems working according to the principles of sequential logic, the mimicking of transistors, and the research on photochromic platforms with an unprecedented degree of functional integration. Furthermore, a series of achievements that add up to the conceptual diversity of molecular logic is introduced, such as the realization of highly complex and logically reversible Toffoli and Fredkin gates by the action of DNAzymes or the use of a multifluorophoric platform as a viable approach towards keypad lock functions. This journal is © The Royal Society of Chemistry. Source

Lyngfelt A.,Chalmers University of Technology
Applied Energy | Year: 2014

Chemical-looping combustion (CLC) of solid fuels is a technology with the potential of reducing the costs and energy penalty dramatically for CO2 capture. The potential for low costs is based on the similarity to coal combustion in fluidized beds. However, this assumes reaching high performance with respect to fuel and gas conversion, or that inadequate performance can be readily mitigated by downstream options. There are uncertainties with respect to the performance that can be reached in large-scale units, as well as with the extra costs needed to compensate for inadequate performance. Performance will be dependent on both reactor design and oxygen carrier properties. The status of chemical-looping combustion of solid fuels is discussed with respect to performance and experiences from pilot operation. © 2013 Elsevier Ltd. Source

Larsson A.,Chalmers University of Technology
IEEE Journal on Selected Topics in Quantum Electronics | Year: 2011

The vertical-cavity surface-emitting laser (VCSEL) has become a light source of great importance for industrial and consumer applications. This includes communication and sensing in particular, where dynamics and optical mode behavior are key performance characteristics. This tutorial treats relevant VCSEL basics, performance requirements and recent progress toward higher speed, higher single-mode power, and polarization control. © 2006 IEEE. Source

Karlsson M.,Chalmers University of Technology
Journal of Lightwave Technology | Year: 2014

To model electromagnetic wave propagation for coherent communications without polarization dependent losses, the unitary 2 \times 2 Jones transfer matrix formalism is typically used. In this study, we propose an alternative formalism to describe such transformations based on rotations in four-dimensional (4d) Euclidean space. This formalism is usually more attractive from a communication theoretical perspective, since decisions and symbol errors can be related to geometric concepts such as Euclidean distances between points and decision boundaries. Since 4d rotations is a richer description than the conventional Jones calculus, having six rather than four degrees of freedom (DOF), we propose an extension of the Jones calculus to handle all six DOF. In addition, we show that the two extra DOF in the 4d description represents transformations that are nonphysical for propagating photons, since they does not obey the fundamental quantum mechanical boson commutation relations. Finally, we exemplify on how the nonphysical rotations can change the polarization-phase degeneracy of well-known constellations such as single-polarization QPSK, polarization-multiplexed (PM-)QPSK and polarization-switched (PS-) QPSK. For example, we show how PM-QPSK, which is well known to consist of four polarization states each having four-fold phase degeneracy, can be represented as eight states of polarizations, each with binary phase degeneracy. © 2014 IEEE. Source

Linne M.,Chalmers University of Technology
Progress in Energy and Combustion Science | Year: 2013

Since the year 2000, a number of very different techniques to image spray formation in optically dense regions of atomizing sprays have appeared in the literature, been further developed, and applied to sprays. Three of them are transillumination techniques (meaning a beam is passed all the way through the spray and imaged on the other side, often called 'line-of-sight'), one technique is internally illuminated (the signal originates inside the spray), and one is a planar laser imaging technique. Researchers intending to use these new results need to understand with clarity what exactly the measurements provide and how reliably they can provide them. This article intends, therefore, to bring some order to the discussion of techniques. It includes a description of each of the five techniques, a review of advantages and limitations for each of them, a comparison, and a discussion of future trends. Most of the techniques are certain to evolve and improve further, but this article can provide a snapshot in time and help create a context for understanding. © 2013 Elsevier Ltd. All rights reserved. Source

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