This article examines the nature and geography of knowledge linkages in the Vienna software cluster. Empirical studies on the software sector have provided contradictory evidence of the relative importance of different sources of knowledge, the spatial dimension of exchanges of knowledge, and the relevance of different channels for the transmission of knowledge. Recent conceptual work on the geogr

Injury patterns and epidemiologic data from 211 moped accident victims and 214 motorcycle accident casualties admitted to hospital over a 5-year period (1977-1981) have been analyzed and compared. The number of those injured in motorcycle accidents tripled; the number of moped accident victims slightly decreased in the period studied. Differences in injury pattern, sex ratio, cause of accident, an

Popular AbstractDen snabba folkökningen I Afrika söder om Sahara förändrar kontinuerligt betingelserna för bondebefolkningens försörjning. I ett av de bördigaste och samtidigt mest tättbefolkade områdena I Östafrika, Mount Meru I norra Tanzania, så har befolkningen nära tiodubblats under loppet av de senaste hundra åren. För bönderna i området är markbristen det allt överskuggande problemet. Till Sustained high population growth rates are radically altering the livelihood conditions for small farmers in sub-Saharan Africa. In one of the most fertile and densely settled areas of East Africa, Mount Meru in Northern Tanzania, the size of the population has increased nearly tenfold within the last century. As a consequence, the most serious problem facing farm families is shortage of land. Cou

This thesis, consisting of six papers, concerns methods for probabilistic analysis of engineering structures. The work comprises evaluations of available methods, developments of new and improved methods, and applications of probabilistic analysis to engineering structures. Comparative calculations using methods representing different strategies for stochastic finite element analysis were carried

Recension av Billy Ehn & Orvar Löfgren; Hur blir man klok på universitetet?

According to the polygyny threshold model, females are compensated for the cost of sharing a territory with other females by breeding in territories of higher quality than those of monogamously mated females. In the polygynous Great Reed Warbler (Acrocephalus arundinaceus), the variation in territory quality may be associated with nest site characteristics or food supply. In this study, we examine

Human skin fibroblasts in different growth states were incubated with [3H]glucosamine and/or Na(2)35SO4 and extracted with Triton X-100 for various periods of time. Free heparan-sulphate oligosaccharides and protein-bound heparan-sulphate chains were separated by chromatography on octyl-Sepharose and analyzed. A pool of endogenously produced oligosaccharides, present in the cultured cells and isol

Målet med arbetet som presenteras i denna licentiatuppsats är att genomföra en analys av problemkomplexet inomhusluft och att med ledning av denna analys anvisa vägar att minska inneluftproblem i framtida byggande. Utifrån detta har tre delsyften formulerats: (1) Analysera existerande inneluftproblem och i samband därmed beskriva vilka faktorer i inomhusluften som medför problem, vilka faktorer so

Isotropic and anisotropic ESR spectra were observed for the radical anions of hexafluorocyclobutene (c-C4F6-), octafluorocyclopentene (c-C5F8-) and perfluoro-2-butene (CF3CFCFCF3-) in γ-irradiated plastically crystalline neopentane, tetramethylsilane (TMS) and TMS-d12 matrices, or the rigid 2-methyltetrahydrofuran (MTHF) matrix. The isotropic spectra of c-C4F6- and c-C5F8- are characterized by thr

In this paper, we propose an adaptive observer for dynamically positioned ships, that can be used together with the controller shown by Fossen and Grovlen, to design an observer-based adaptive control scheme. The resulting closed-loop system is globally asymptotically stable with respect to the ship positions and velocities, and globally stable with respect to adaptation to unknown parameters. A d

Aim: Smoking and hypertension are known causes of stroke and dementia. This study was designed to test the longitudinal effect of lifestyle factors and hypertension on cerebral blood flow (CBF) in old age. Method: A study of an unselected population cohort of 703 men, born in 1914, has been in progress since 1968 and the last clinical examination occurred at age 69. CBF was examined in 129 survivo

This prospective controlled intervention study over 12 months evaluated the effect of exercise on muscular function, physical ability, and body composition in pre-pubertal boys. Sixty-eight boys aged 6-8 years, involved in a general school-based exercise program of 40 min per school day (200 min/week), were compared with 46 age-matched boys who participated in the general Swedish physical educatio