This paper gives a brief summary of computational methods in heat transfer equipment, i.e., CFD (computational fluid dynamics) methods for thermal problems, and turbulence modeling for single phase applications in the design, research and development of heat exchangers. Some examples for real heat exchangers are shown to demonstrate how CFD methods can be used as R & D tools. Nevertheless, lim

The paper classifies available online products and their applicability through the model offered by Diana Laurillard as to their contributions to active learning.

In this paper two extensions to an optimization based model reduction method are considered: frequency-weighted and parameter-dependent model reduction. The performed extensions are simple and natural, this fact illustrates the advantages of the method. Also, the methods may be applied using an exact model or frequency samples ofa model. We construct numerical examples to illustrate both extension

Den inre och yttre vattenomsättningen i sex svenska städer har studerats.Dagvatten från hårda ytor till kombinerade system har beräknats liksomdränering av mark och grundvatten till detta system. Diffus avrinningutanför spill- och dagvattensystem har också beräknats. Inläckage tillspillvattensystem är ganska lika i de sex städerna. Det diffusa flödet tillrecipienter beror på klimatfaktorer.The inner and outer water balance in six Swedish cities has been studied.Direct stormwater contribution to the combined system has beendetermined, as has drainage of soil and groundwater to this system.Diffuse runoff not being in the sewerage or stormwater systems has alsobeen determined. The leakage into the sewerage system is almost thesame in all cities. The diffuse runoff depends on climatic f

Languages can be classified into three types, e.g. situation-oriented (e.g. Russian, Chienese, etc.), speaker-oriented (e.g. Bulgarian, Turkish, etc.) and hearer-oriented (e.g. English, Danish, etc.) (Durst-Anderssen 2005, 2006, 2008). In this paper, it is argued that the difference in spoken and written discourse can be compared to different patterns in these classificatory types, and historical

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Regular column on theatre in the weekly newspaper Arbetaren (The Worker).

In this paper we propose a new physically motivated model that allows to study the interaction between the antennas and the propagation channel for Multiple-Input Multiple-Output (MIMO) systems. The key tools employed in the model are the expansion coefficients of the electromagnetic field in spherical vector waves and the scattering matrix representation of the properties of the antenna. We deriv

Man kan kalla dem hackers, hacktivister eller nätaktivister. Själva ser de sig som tekniskt intresserade, en teknisk gemenskap. Deras långsiktigt politiska mål skiftar, de saknar gemensam ideologi och fasta strukturer. Det som delas är en innerlig fascination för tekniken bakom nätet – och kanske en minst lika innerlig aversion för destruktion av detta.

Abstract not available