Under livets utveckling på jorden har solljuset med sitt karakteristiska spektrum och sin dygnsvariation haft en avgörande betydelse, t ex att vi har olika hudfärg, att vi blir solbrända, att vi har en 24-timmars dygnsrytm. Detta behandlas under rubrikerna Solljusets inverkan på huden; Årstidsrelaterad nedstämdhet; Skiftarbete och arbete under jord; Belysningsplanering för bättre hälsa; Färgsättni

Cellulose is one of the most abundant biopolymers on earth. Several organisms degrade cellulose, one of the most studied is the fungus Trichoderma reesei which produces seven genetically different cellulases. In this thesis, a thorough study of the hydrolytic characteristics of the less studied endoglucanases Cel12A (EG III), Cel45A (EG V) and Cel61A (EG IV) of T. reesei is presented. Cel12A showe

Asymptotic iterative decoding performance of low-density parity-check (LDPC) convolutional codes is analyzed. An important role within the analysis is a theorem on the minimal length of cycles in the Tanner graph describing a code

The design of efficient data structures is of primary importance in creation of theoretical algorithms as well their more tangible descendants, computer programs. In this dissertation we study computational aspects of data structures and their respective algorithms from a theoretical viewpoint, which are however of direct importance in the implementation of solutions for real-world problems. We pr

Det övergripande syftet med denna studie är att finna strategier för att skapa ett friskare arbetsliv långt upp i åren och för att se äldre medarbetare som en viktig resurs vilket organisationen bör värna om och förvalta. I denna rapport studeras enkätsvaren från cirka 2 000 medarbetare 55 år eller äldre inom hälso- och sjukvården. De svarande kom från yrkesgrupperna läkare, sjuksköterska, sjukgym

In the reported study, we explored student’s attitudes to a visually androgynous agent in comparison to a male and a female agent in a Teachable Agent (TA) based math game. Each student interacted with two agents, playing the game and chatting with them, and were asked which of the two they preferred (i) as their tutee and (ii) as their conversational partner, and why. Results were that overall th

A numerical study has been carried out for slot jet impinging on flat and concave surfaces. Five turbulence models are employed for the predictions of these strongly strained turbulent flows, namely linear eddy viscosity model (LEVM), low-Re explicit algebraic Reynolds stress model (EASM) and three different V2F models. A bounded formulation for Cμ was also introduced to account for the better pre

We consider the problem of covering arbitrary polygons with rectangles. The rectangles must lie entirely within the polygon. (This requires that the interior angles of the polygon are all greater than or equal to 90 degrees.) We want to cover the polygon with as few rectangles as possible. This problem has an application in fabricating masks for integrated circuits. In this paper we will describe