Straightforward simulation of amplifier distortion involves transient simulation of operation on a sine wave input signal, and a subsequent FFT of the output voltage. This approach is very slow on class D amplifiers, since the switching behavior forces simulation time steps that are many orders of magnitude smaller than the duration of one period of an audio sine wave. This work presents a method

A controller for a tunneling accelerometer has two tasks: to establish tunneling and to maintain tunneling during acceleration. This paper describes the design and implementation of a digital controller that accomplishes these tasks and provides the appropriate gain switching. The control law is based on a standard configuration of an observer and state feedback. A digital controller is implemente

This paper presents a simulation model that has been developed to analyse how the application of Radio Frequency Identification technology (RFID) affects material handling activities in a retail distribution centre. The simulation model handles both stochastic and dynamic behaviours, and describes how the receiving, picking and shipping activities will behave and perform over time when RFID tags a

In 2012 Google started a campaign to make parts of its infrastructure visible. Up until that year the company’s data centers had been highly secret facilities hidden from the public eye. The visualization campaign was mainly based on stories and images distributed via the Internet. The images were often suggestive, invoking both enchantment and trust. The text starts by pointing out and discussin

Remote imaging measurements of laser-induced fluorescence have been performed, with application towards cultural heritage. Measurement campaigns have been performed at, e.g., the Coliseum in Rome. Differences in fluorescence spectra from different points were found and images corresponding to different features could be produced for thematic mapping.

In this paper, we consider the problem of robust optimization for a system with uncertainty of rank one. The main result is the regularization of the limiting optimal controller. We will give the method to obtain the low order suboptimal controller that provides the stability margin as close to the optimal one as we wish. The method is illustrated by some scalar examples.

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This paper analyses experiences of depression and antidepressant use within a neoliberal society. The paper is based on interviews with mainly women using antidepressants in Sweden and makes use of the post-political as conceptualized by Chantal Mouffe as a framework. I find that depression is reduced to a state, a diagnosis. In comparing with Nancy Friedan who gave the depression and despair Amer

The lifetime of two metastable levels in Fe+ has been measured by laser probing of a stored ion beam. In the dense spectrum of Fe+, the metastable levels a 6S5/2 and b 4D7/2 were selected and their lifetimes were determined to be 230+/-30 and 530+/-30 ms, respectively. The lifetimes are compared with previous theoretical results. Metastable lifetime measurements of Fe+ are of great importance for

The potential of elemental analysis of light elements by measuring elastically scattered particles as a complement to PIXE (Particle Induced X-ray Emission analysis), when using a 3 MV electrostatic tandem accelerator is discussed. The discussion is based on protons and He ions with energies suitable for PIXE. Some experimental results of scattering yields are included.