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We celebrate Certec’s 20th birthday . . . . . . by giving you a book of 20 important ideas filled with pictures and text. Each idea is expressed in a succinct heading that sums up what we have learned over the years. The ideas also act as a complement to all the reports, website cover pages, brochures, lectures and annual reports. There are 30,000 documents at www.certec.lth.se that provide the b
A power-series expansion method for approximate analysis of the guided modes in a cylindrical, radially inhomogeneous dielectric waveguide is presented. The method is developed for a piece-wise polynominal permittivity profile. The solution of the scalar wave equation is constructed by a sequence of power-series expantions. Convergence is ensured and accuracy maintained by regulating the distance
In this paper, physical limitations on the directivity D and Q-factor Q are derived for antennas of arbitrary shape. The quotient D/Q is shown to be bounded from above by the antenna volume and certain shape coefficients in terms of the eigenvalues of the high-contrast polarizability dyadic. The theory is exemplified by numerical results for the half-wave antenna with astonishing agreement.
Robotar kan betraktas som ytterligare en i raden av tekniska innovationer inom äldreomsorgen, buren av förhoppningar om ökad effektivitet men med bibehållen livskvalitet i samband med ökade omsorgsbehov och möjligheten att bo kvar hemma. Diskursen är tidvis utopisk - löften om att hjälpa äldre människor att bli mer självförsörjande och självständiga med hjälp av robotar - och från ett mer dystopis
Decision outcomes and their lead times are critical in product management, as the market success of a product may strongly depend on the both the decisions themselves and their timing in relation to the market and competitors. This paper presents an investigation of one particular industrial case study data set by comparing upstream scoping decisions with downstream change decision. The results in
This article presents an analysis of definiteness from a cognitive and typological approach. The claim is that definiteness is a property based on referential grounds, and that this property goes beyond the language specific variations. First, some theories of the concept of definiteness are presented, together with a brief typological overview. Then follows the analysis of three languages: Greek
A professional impersonator has been studied when training his voice to mimic two target speakers. Training was performed by listening and/or using the output from a speaker verification system as feedback. Tests after training showed a significant increase in verfication score.
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Under de senaste 20 åren har ordet region gjort ett minst sagt stormande intåg i det politiska språket ute i Europa, och under det senaste decenniet så även i Sverige. I det Europa som håller på att växa fram förmodas just regionen spela en alltmer central roll som ett politisk självstyrande område mellan den centrala och den lokala nivån. Vilka idéer och tankegångar är det egentligen som driver d
