In this paper, a passively clamped quasi-resonant DC link converter is analysed, implemented and evaluated in a battery charger application. Design expressions for selection of passive component values, based mainly on the specified maximum output voltage derivative and the duration of the zero voltage interval, are given. Design of the inductive components and selection of appropriate power semic

Detraditionalization in late modernity has both affected traditional religion and the domain of clinical therapy. New varieties of spiritualized therapy are rapidly increasing in contemporary Sweden, typical of which is to have added healing rhetoric to their agenda, such as "find your inner self" or "develop your inner potential". Four common denominators seem to guide these practices: self-made

In recent decades, the development of technology that aids in documenting, analysing and communicating information regarding archaeological sites has affected the way that historical information is transmitted and perceived by the community. Digital technologies have affected archaeology at all levels; for example, novel investigation methods have highlighted new and unknown aspects of archaeologi

During the last years, costs for power interruptions to customers have increased and from 2011 a new legislation will not allow power interruptions longer than 24 hours. Electric power utilities are facing important costs to decrease the likelihood of power interruption in the future. Island operation of distribution systems is not commonly employed in Sweden, also for safety reasons. The penetrat

Epistemic uncertainty has been suggested to be fundamental to human experience. The authors of this paper believe that people need to exercise creativity in their conjectures, drawing upon knowledge and experience, in order to generate solutions to both instrumental and epistemic problems, and encourage higher orders of learning. Innovative methodologies are needed which can provide support for in

Popular Abstract in Swedish Robust konstruktion handlar om hur produkter skall konstrueras för att bli okänsliga mot oväntade störningar och variationer i t.ex. omgivningen under drift. Normalt har detta problem angripits med den sk. Taguchi-metoden, i vilken experiment utförs efter en viss metodik på en prototyp, varefter produktens beteende kartläggs och konstruktionsvariablerna väljs så att ettThe activity of robust design of mechanical products and how it can be accomplished in pre-prototype design phases, is discussed in this thesis. It is advocated that to be fully efficient and effective optimization of product robustness should commence already in the conceptual design phase. Moreover, since product optimization is a process, robust design should be perceived and implemented as a p

This chapter describes small-scale reforming for on-site production of hydrogen. By small scale is meant a production rate higher than 50Nm3h-1. First, an overview of the reformer technology and feedstock options is given and hydrogen purity issues are discussed. Second, examples of suppliers and cost trends are presented. Finally, research related to progress in materials, development of more rob

This is a sketch of the history of conservative thought from the days of the revolutions in France and the US.

This study in contemporary history describes the transformation of the public sphere in Sweden during the period 1969-1999, and analyses the role of information technology and politics in the process. The overall aim of the study is to explain how, and why, the public sphere in Jürgen Habermas sense has deteriorated during a period of rapid technological and political change, when increasing atten

Epitaxial III-V nanowhiskers have been grown with orientation in the [111]B and [100] directions. While the nature of the crystal structure in the (111)B type of whiskers varies more or less at random between hexagonal (wurtzite) and cubic (zincblende) structure, the (100) type whiskers are of single crystal zincblende structure. We show that the bounding surface facets of the whiskers are either