Next generation wireless systems have to be able to efficiently deal with fast fading environments in order to achieve high spectral efficiency. Using multiple-input multiple-output (MIMO) systems and exploiting receive diversity, their spectral efficiency can be greatly increased. Commonly, the channel is estimated via training symbols, before the data detection is carried out based on the previo

This article presents the accomplishments and challenges of a rural sustainable development initiative in Nyanza Province, Kenya. Our focus is on the sale and financing of a simple technology — an improved cookstove — by a local entrepreneur. The theoretical basis of the research is innovation systems and (social) entrepreneurship. We first de­fine the major challenges of the diffusion process enc

Many popular first order algorithms for convex optimization, such as forward-backward splitting, Douglas-Rachford splitting, and the alternating direction method of multipliers (ADMM), can be formulated as averaged iteration of a nonexpansive mapping. In this paper we propose a line search for averaged iteration that preserves the theoretical convergence guarantee, while often accelerating practic

Short presentation of medieval archaeology at the crossroad of different methodological perspectives.

Purpose: This study explores informational structures producing and organizing the construction of waste sorting in Sweden. It shows how the issue is constructed by it being searched for in Google and how this contributes to the specific informational texture of waste sorting in Sweden. It is guided by the following questions: Who are the main actors and which are the central topics featuring in G

- Allmänheten anser generellt att klimatfrågan är viktig, och förklarar sig beredd att agera både som medborgare och konsumenter. Samtidigt varierar allmänhetens klimathänsyn kraf- tigt mellan olika områden. Social motivation är en stark drivkraft som kan förklara allmänhe- tens motstridiga agerande i klimatfrågan.- Positiva argument som förbättrad luft och högre livskvalitet i stä

n order to protect their food from competitors, ball-rolling dung beetles detach a piece of dung from a pile, shape it into a ball, and roll it away along a straight path [1]. They appear to rely exclusively on celestial compass cues to maintain their bearing [2, 3, 4, 5, 6, 7 and 8], but the mechanism that enables them to use these cues for orientation remains unknown. Here, we describe the orien

Popular Abstract in Swedish I nuklearmedicinska mätningar registreras förekomsten av en radioaktiv substans, vilken tillförts kroppen, via de fotoner som substansen utsänder. I denna studie har använts tomografisk nuklearmedicinsk teknik, SPECT, som ger information om regional fördelning av radioaktivitet i tre dimensioner. Aktivitetsfördelningen avspeglar någon fysiologisk funktion, exempelvis geThe objective was to develop and validate methods for single photon emission computed tomography, SPECT, allowing quantitative physiological and diagnostic studies of lung and heart. A method for correction of variable attenuation in SPECT, based on transmission measurements before administration of an isotope to the subject, was developed and evaluated. A protocol based upon geometrically well de