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Two frameworks are proposed for extremum seeking of general nonlinear plants based on a sampled-data control law, within which a broad class of nonlinear programming methods is accommodated. It is established that under some generic assumptions, semi-global practical convergence to a global extremum can be achieved. In the case where the extremum seeking algorithm satisfies a stronger asymptotic s

Design of ultra wideband absorbers with bandwidth ratios larger than 10:1 is investigated. It is explained that if there is no constraint on the total thickness of the absorber, achieving large bandwidths is straightforward. The problem becomes challenging when the minimization of the total thickness is considered. It is shown that for a given frequency response, the total thickness of a nonmagnet

It can be claimed that the emergence of the future tense is closely related to cognitive and cultural artefacts from our earlier civilisations, such as burial practices and concepts of afterlife. In this paper, we present one such specific case concerning the concept of zero. The zero and nothingness have haunted earlier thinkers, philosophers and theologians alike, since the idea of ex nihil ‘out

Expanderande fogband används i allt större omfattning som tätning runt fönster och dörrar. Ett forskningsprojekt visar nu att många expanderande fogband både läcker och magasinerar vatten från slagregn, vilket utgör en potentiell fara för fuktskador.

I nordvästra Skåne har tio kommuner valt en ny samarbetsform för att möta de problem och möjligheter som omvälvningarna inom länet ställer dem inför. Organisationen NOSAM (Nordvästra Skånes Samarbetskommitté) är delvis en arvtagare till det tidigare kommunalförbundet NSK, men den bör också ses som ett försök att säkerställa den kommunala autonomin inom ramen för det nya Skåne län. Farhågorna om at

Every language has a set of verbs which denote the various actions we perform when we communicate through spoken language. In linguistic literature, these are commonly referred to as speech act verbs and they typically include communicative categories like asking, answering, promising, accusing, telling and a host of others. Most speech act verbs have very specific meanings which limit their usage

In this paper, wave splitting technique is applied to a homogeneous Timoshenko beam. The purpose is to obtain a diagonal equation in terms of the split fields. These fields are calculated in the time domain from an appropriate set of boundary conditions. The fields along the beam are represented as a time convolution of Green functions with the excitation. The Green functions do not depend on the

Models of service encounters are often fraught by reductionism, describing business relationships as mathematical combinations of dyadic constellations. Metaphors of ideal social relationships (marriages or friendships) are highlighted to stress normative aspects of equal, balanced and long-term business partnerships. However, these approaches are limited in their analytical sensitivity, as they c