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For a stationary two-dimensional random field evolving in time, we derive the intensity distributions of appropriately defined velocities of crossing contours. The results are based on a generalization of the Rice formula. The theory can be applied to practical problems where evolving random fields are considered to be adequate models. We study dynamical aspects of deep sea waves by applying the d

An analysis of long-term fading properties of 4×4 CW MIMO channels is presented in this paper. The main focus has been on the long-term variability of MIMO channels in urban cellular environments, with emphasis on the decorrelation distance over mid range distances along the mobile trajectory for different base station antenna heights. A model that characterizes the decorrelation distance at diffe

Based on detailed 2D and 3D numerical radiation hydrodynamicscalculations of time-dependent compressible convection, we have studiedthe dynamics and thermal structure of the convective surface layers of aprototypical late-type M-dwarf at T_eff=2800 K, and log g=5.0with solar chemical composition. The thermal structure of the atmosphereis dominated by molecular absorption, the formation o

Introduction: Transnationalism and migration Ulf Johansson Dahre The 5th annual Somalia International Rehabilitation Centre (SIRC) Conference of the Horn of Africa focused on “The Role of Diasporas in Peace, Democracy and Development”. The conference was held in Lund, Sweden, August 19-20, 2006. The content of this volume reflects some of the views and proceedings presented at the conference. I

An analysis of the critical reception of the poetry of Swedish writer Lars Forssell

This thesis is a summary of six papers which concern synthesis of optically active bicyclo[2.2.2]octane derivatives. The derivatives prepared are important building blocks in a study towards a possible replacement of the diterpenoidic part of taxol, (baccatin III), so as to construct a taxol mimic. Some of the derivatives have also been developed into new bidentate ligands. TitaniumIV complexes of

The paper presents theory and simple expressions to estimate adjacent-channel leakage power ratio (ACLR or ACPR) with WCDMA signals that greatly simplify the design of analog circuits. High accuracy is obtained when the AM/AM and AM/PM conversion can be modeled by a polynomial of reasonable order. Results based on a power amplifier and a low-noise amplifier give less than 1dB estimation error for

Kort historik över studentradion i Lund

It is increasingly suggested that societies must be resilient to be safe and sustainable. While there are many approaches to resilience available, not all of them operationalize the concept to the extent of guiding what to look for when observing actual communities. This is a requisite for linking the conceptual and the actual, and vital for our ability to develop societal resilience. Drawing on r