Search results

Abstract in UndeterminedA dual purpose, high power, off board battery charger for electric vehicles is presented. For higher viability and increased usage of the charger, grid conditioning capabilities are included in the concept. Conventional power electronic converter topologies are used in a new application, which combines fast EV battery charging with active filtering. Furthermore bi-direction

A review. Gels formed from milk by renneting or acidification under quiescent conditions may subsequently show syneresis, i.e., expel liq. (whey), because the gel (curd) contracts. In making cheese from renneted or acidified milk, syneresis is an essential step. Consequently, it is useful to understand and quant. describe syneresis as a function of milk properties and process conditions, particula

We develop a parametric high-resolution method for the estimation of the frequency nodes of linear combinations of complex exponentials with exponential damping. We use Kronecker's theorem to formulate the associated nonlinear least squares problem as an optimization problem in the space of vectors generating Hankel matrices of fixed rank. Approximate solutions to this problem are obtained by usin

In this paper, we have investigated the use of virtual antenna arrays at the receiver to do single antenna direction-of-arrival estimation. The array coordinates are obtained by doing simple dead reckoning using acceleration and angular speed measurements from a low cost micro-electro-mechanical system inertial measurement unit (IMU). The proposed solution requires no extra hardware in terms of re

Convolutional codes is one possibility when there is a need for error-correcting codes in communication systems. Using convolutional codes over rings is a relatively new approach. When coding is used in combination with, for example, phase-shift keying, codes over rings constitue a natural choice as the symbols in the code alphabet have a natural signal point interpretation. This thesis reports on

A large number of studies carried out on pupils aged 8–14 have shown that teachable agent (TA) based games are beneficial for learning. The present pioneering study aimed to initiate research looking at whether TA based games can be used as far down as preschool age. Around the age of four, theory of mind (ToM) is under development and it is not unlikely that a fully developed ToM is necessary to

Popular Abstract in Swedish Denna studie handlar om mediereception som pedagogisk form och meningsskapande över tid. Jag är intresserad av att förstå komplexitet i meningsskapande processer som utgår från medieproduktioner. Syftet med avhandlingen är att undersöka vad mötet mellan en grupp lärarstudenter och deras texter kan erbjuda för möjligheter och begränsningar för meningsskapande över tid i The present study is about media reception as an educational form, supporting meaning-making over time. The thesis stems from the desire to understand the complexity in a meaning-making process that takes its point of departure in media productions. The aim is to investigate the possibilities and limitations for meaning-making over time, afforded by the meeting of a group of student teachers and t

Doppler-free saturation spectroscopy in the regime of strong pumping intensities and optically thick atomic samples is investigated experimentally and theoretically. It is shown that a very high signal-to-background ratio can be obtained and, at the same time, subnatural linewidths can be reached. Further contrast and linewidth improvements can be attained by supplementing the primary depleted pum

This report highlights the conditions for young people trying to establish themselves in the labour market in the Nordic countries. The aim has been to examine similarities and differences with regard to specific aspects of the welfare systems with a focus on upper secondary school level and political initiatives in the labour market. The passage of students through upper secondary school, transit

Siri Dahlquist (1889-1966) one of the first women achieving a theol.cand. degree in Sweden. Belonging to the Young Church Movement,as a poet, she reflects the themes of this movement: the calling,the imitation of Christ,the national church, and the mission. She shared the preference for domestic motifs, a simple style, and unobtrusiveness, with contemporary idyllist poets.