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Generalized alternating projections is an algorithm that alternates relaxed projections onto a finite number of sets to find a point in their intersection. We consider the special case of two linear subspaces, for which the algorithm reduces to matrix multiplications. For convergent powers of the matrix, the asymptotic rate is linear and decided by the magnitude of the subdominant eigenvalue. In t
When local control strategies are used to arrange a platoon into a string like formation, there is mounting evidence that a poorly regulated accordion like motion will emerge. In this paper we prove that this is an inevitable consequence of using local distance measurements to design the control. More specifically we demonstrate that no controller, irrespective of its dynamical complexity, sparsit
The passivity approach to the design of large networks is based on preserving the passivity property under different types of interconnection: parallel and negative feedback. Since the passivity property implies stability, this allows large and topologically complex networks to be constructed on the basis of simple local rules without the need for global stability analysis. In this paper we charac
Implementing frequency response using grid-connected inverters is one of the popular proposed alternatives to mitigate the dynamic degradation experienced in low inertia power systems. However, such solution faces several challenges as inverters do not intrinsically possess the natural response to power fluctuations that synchronous generators have. Thus, to synthetically generate this response, i
A method for designing a set of controllers to robustly stabilise a network of linear systems is presented. The method allows the design of each controller to be posed as a loopshaping problem. Critically each loopshaping problem requires only local knowledge of the overall system model to formulate, and may be solved separately. Furthermore the approach is inherently scalable, as any local change
Kustkaklav Xanthoparmelia tinctina förekommer på västkusten i Sverige. I denna artikel kartläggs arten med hjälp av litteratur och samlingar. Morfologi, kemi och DNA har undersökts på ett nyinsamlat exemplar med apothecier från Åsa i Ölmevalla socken i Halland. Ytterligare ett antal fertila herbariebelägg från Halland och Bohuslän anges, vilket är anmärkningsvärt då arten bara rapporterats fertil
Inventeringen av lunglav Lobaria pulmonaria vid Östersjön fortsatte under våren 2017. I år besöktes nordöstra Skåne, Blekinges och sydöstra Smålands kusttrakter och södra Öland. Jämfört med fjorårets inventering i Skåne blev årets resultat betydligt mer glädjande. Lunglaven fanns kvar på 60% av de gamla lokalerna jämfört med 25% i den nemorala delen av Skåne.
Den finlandssvenska författarinnan Hannele Mikaela Taivassalos författarskap läses i ljuset av en gurlesk estetik, hennes romaner läses som feministiska skräckromaner. I centrum står ett existentiellt tema: vikten av att göra ett val.
Bookstores are one of the most visible places for books in the public space. No bookstore can ever offer every book available; rather it is in its selection that each bookstore is unique. Value, writes Michael Bhaskar in Curation (2016), no longer resides in access, but in curation – in selecting and arranging. The article argues that curating practices in bookstores can be mapped from four main aBookshops are one of the most visible places for books in public space. No bookshop can ever offer every book available; rather it is in its selection that each bookshop is unique. Value, writes Michael Bhaskar in Curation (2016), no longer resides in access, but in curation—in selecting and arranging. The article argues that curating practices in bookshops can be mapped from four main aspects: sp
Recension av Tobias Berglund & Niclas Sennerteg, Finska inbördeskriget
Cinque (1988) notices that Italian impersonal si can be interpreted so as to include the speaker and that such a reading is actually mandatory in certain contexts. A similar conclusion holds for impersonal man in a language such as Swedish, with the difference that, in the relevant contexts, man takes on the reading of 1st person singular, hence ‘I’ and not ‘we’. In this paper, I argue that Cinque
