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We describe a fully computer-controlled differential optical absorption spectroscopy system for atmospheric air pollution monitoring. A receiving optical telescope can sequentially tune in to light beams from a number of distant high-pressure Xe lamp light sources to cover the area of a medium-sized city. A beam-finding servosystem and automatic gain control permit unattended long-time monitoring.

This paper presents recursive formulas which admit simultaneous tests of stability and evaluation of quadratic loss functions for linear discrete-time dynamical systems. The method admits a significant reduction of the number of computations in comparison with previously known methods.

Popular Abstract in Swedish Avhandlingen berör det så kallade "struktur och rörelse"-problemet som är centralt inom datorseendefältet. Målet är att givet tvådimensionella bilder av ett föremål, kunna återskapa dess tredimensionella form och koordinater i rummet, dvs strukturen, samtidigt med kamerans position relativt objektet i varje bild, dvs rörelsen. Inom robotiken kallas tekniken för "simultaThis thesis presents contributions to structure-and-motion estimation, a central topic in the field of geometric computer vision. In particular, the problem of view planning is considered, and continuous and discrete optimization-based algorithms are given for how to plan the path of a sensor to its destination, while balancing the competing goals of path length and reconstruction accuracy. The sa

This study identifies teachers’ perceptions of requirements for including collaborations with the surrounding world in their teaching practice, with the aim of providing authentic and entrepreneurial learning environments for students. School management, time and teachers’ personal character traits and disposition were the most frequently stated areas of concern, followed by colleagues, surroundin

Quantum-beat signals can also be observed when the length of the exciting pulse is not short compared to the Bohr precession period if spontaneous decays during the pulse are important. Experimental demonstration for Zeeman quantum beats in the 6s6p 3P1-6s21S0 ytterbium transition, as well as a simple description of the phenomenon is given. In the same way as quantum beats can be obtained for cohe

Spectrum balancing (SB) techniques optimize transmission and can significantly improve digital subscriber lines (DSL) services. In the literature, the DSL system optimization is typically formulated as a rate maximization problem. However, there is an increasing interest in minimizing the considerable amount of power consumed by telecommunication networks. Few works in the SB literature have explo

In this paper, physical bounds on scattering of acoustic waves over a frequency interval are discussed based on the holomorphic properties of the scattering amplitude in the forward direction. The result is given by a dispersion relation for the extinction cross section which yields an upper bound on the product of the extinction cross section and the associated bandwidth of any frequency interval

Reviews the video, This one moment: Skills for everyday mindfulness by M. M. Linehan (2003). Marsha Linehan is well known as the developer of Dialectical Behavior Therapy (DBT), a comprehensive treatment for borderline personality disorder (BPD). In "This One Moment," Linehan explains, with easy-to-follow and creative examples, how to be more fully in the present. She divides her instructions into

Popular Abstract in Swedish Även om vi i dagens samhälle försöker minska vårt beroende av förbränningsprocesser är förbränning fortfarande vår största energikälla och förväntas så förbli under en lång tid. Därför är det viktigt att effektivisera förbränningsprocesserna för att maximera den energi som utvinns medan utsläppen samtidigt minimeras. En av de oönskade biprodukterna vid förbränning är soThis work has been aimed at developing and applying laser-induced incandescence (LII) for flame soot characterization. The basic principle of LII is rapid heating of the soot particles to temperatures of 3500-4000 K by short laser pulses. Thereby the intensity of the soot incandescence is increased. By detection of this increased incandescence and analysis of the detected signal, the volume fracti

A new method for QRST cancellation is presented for the analysis of atrial fibrillation in the surface electrocardiogram (ECG). The method is based on a spatiotemporal signal model which accounts for dynamic changes in QRS morphology caused, e.g., by variations in the electrical axis of the heart. Using simulated atrial fibrillation signals added to normal ECGs, the results show that the spatiotem