653 research outputs found
Relativistic Many-Body Theory: A New Field-Theoretical Approach
No full textRelativistic Many-Body Theory treats — for the first time — the combination of relativistic atomic many-body theory with quantum-electrodynamics (QED) in a unified manner. This book can be regarded as a continuation of the book by Lindgren and Morrison, Atomic Many-Body Theory (Springer 1986), which deals with the non-relativistic theory of many-electron systems, describing several means of treating the electron correlation to essentially all orders of perturbation theory. The treatment of the present book is based upon quantum-field theory, and demonstrates that when the procedure is carried to all orders of perturbation theory, two-particle systems are fully compatible with the relativistically covariant Bethe-Salpeter equation. This procedure can be applied to arbitrary open-shell systems, in analogy with the standard many-body theory, and it is also applicable to systems with more than two particles. Presently existing theoretical procedures for treating atomic systems are, in several cases, insufficient to explain the accurate experimental data recently obtained, particularly for highly charged ions. This shortcoming is expected to be due to omission of combined QED-correlational effects, included in the new unified procedure. All methods treated in Relativistic Many-Body Theory are illustrated with numerical examples. The main text is divided into three parts. In Part I, the standard time-independent and time-dependent perturbation procedures are reviewed. Part II describes three methods for QED calculations, a) the standard S-matrix formulation, b) the Two-times Green’s-function method, developed by the St Petersburg Atomic Theory group, and c) the Covariant-evolution-operator (CEO) method, recently developed by the Gothenburg Atomic Theory group. In Part III, the CEO method is combined with electron correlation to arbitrary order to a unified MBPT-QED procedure. In this procedure the electron correlation can be included to high order, and therefore this procedure is expected to lead to faster convergence than treating the BS equation order by order. Ingvar Lindgren is also the author of the highly-cited "Atomic Many-Body Theory" book published by Springer
Combining Keynes and Schumpeter. Ingvar Svennilson's Contribution to the Swedish Growth School and Modern Economics
No full textIn a study of European growth in the interwar period, the Swedish economist Ingvar Svennilson integrated a Keynesian theory of cumulative growth with a Schumpeterian analysis of economic transformation. Svennilson emphasised that innovations and the use of new technologies had been stimulated by high demand and production growth. Svennilson’s strong commitment to "Vendoorn's Law" which actually was "Svennilson's Law", made it difficult to incorporate him in a Schumpeterian tradition. A synthesis between Keynes and Schumpeter with Svennilson as a mediator was also prevented by the decisive role of entrepreneurship and the critique of Keynesian models in works by Schumpeter and the Swedish growth school. However, a synthesis has been facilitated by neo-Schumpeterian theories of demand-led innovations and cumulative economic processes. Svennilson’s study has been superseded by later contributions to economics except for a theory of a negative, "Keynesian", relationship between unemployment and growth and an exceptional "un-Verdoornian" theory that high aggregate demand may lead to crowding-out of new firms from capital markets. Besides, Svennilson's integration of short run and long run macro analysis and of theoretical and empirical work is still a fruitful research strategy in economics.Innovations; Cumulative Growth; Productivity Growth; Verdoorn’s Law; Swedish Growth School
Astrid Lindgren and the Archives
No full textThe author Astrid Lindgren (1907-2002) is for many Swedes a genuine national icon. On several occasions, when the most popular and influential Swede is to be announced, Astrid Lindgren’s name is always one of the top names. Astrid Lindgren is for the Swedes known not only as a famous author, but also as a person who spoke out on things she found wrong in the Swedish society. In the history of Swedish literature 1945 is usually regarded as a milestone and Astrid Lindgren’s book Pippi Longstocking was published and revolutionised both children’s literature and the attitude to children and their upbringing. Astrid Lindgren also worked as editor-in-chief for the publishing house Rabén & Sjögren from 1946 to 1970 and for almost a quarter of a century she was responsible for the children’s literature while at the same time she was in practise her own editor. Today, ten years after she passed away 94 years old, her remaining papers, letters and manuscripts are kept in different archives where interesting research can be carried out. There is a substantial amount of material from her rich and prolific life and in this article I wish to illustrate how this material can be used to provide a deeper knowledge of Astrid Lindgren as a person and as an editor.</p
Emeriti 16
No full textMedverkande: Ingvar Lindgren och Karl-Erik Eriksson. Programledare: Mats Oscarson. Ingvar Lindgren, född 1931, professor emeritus i fysik, doktor i fysik 1959, professor i fysik vid Chalmers tekniska högskola 1966 och Göteborgs universitet 1995, Karl-Erik Eriksson, född 1935, professor emeritus i teoretisk fysik, doktor i teoretisk fysik 1961, professor i teoretisk fysik vid Göteborgs universitet1963, gästprofessor vid Karlstads universitet 2000. Mats Oscarson, född 1939, professor emeritus i pedagogik, doktor i engelska vid Göteborgs universitet 1973, professor i pedagogik vid Göteborgs universitet 2001
Astrid Lindgren oggi. Spunti per una riflessione
No full textThe Author does a study in deep about the charming work of Astrid Lindgren. Her books rapresent a widening of social childhood, and we can find some marks of fantastic mind and unconventional behaviour in them. The Author underlines the actuality of Lindgren’s literature
Possibillity of christian interpretation of selected works of Astrid Lindgren
No full textThe goal of the theses is to interpret a selected work of A. Lindgren in a theological way. Methodology of the practical part is built on the broad context of early Christian inculturation (interpretation of ancient culture in the Patristic Tradition, introduced in the work of Hugo Rahner), and of the modern philosophical-theological interpretation of secular culture (interpretation of Don Juan in the work of Karel Vrána). The personality of the author A. Lindgren is then described, with emphasis on certain biographical facts which are particularly important for the goal of the theses. The work of German theologian Thomas Vogel is introduced in the Czech environment for the first time. Thomas Vogel is well-known for his Christian interpretations of A. Lindgren?s books. In the final part the author interprets the book Mio, My Son from christological, ecclesiological and eschatological point of view
Astrid Lindgren and the Archives
No full textThe author Astrid Lindgren (1907-2002), well-known for the characters Pippi Longstocking, the Brothers Lionheart, Emil and Karlsson-on-the roof, is for many Swedes a genuine national icon. On several occasions, when a list of the most popular and influential Swede has been published, Astrid Lindgren’s name has been prominent. Around the year 2000 many Swedes voted Astrid Lindgren the most important person of the entire 2000 years, something that says much about our often short memory, but more about how popular Astrid Lindgren really is. In the year she turned 90 she was selected as ‘This Year's Swede in the World’ by The Society for Swedes in the World because few Swedes have been so esteemed throughout the world. On receiving the prize she said, ‘You are giving the prize of This Year's Swede in the World to a person who is extremely old, half blind, half deaf and completely mad. We must be careful about spreading this around’ (Törnqvist-Verschuur 2011, p.120)
The 1st International Paderborn Computer-Othello Tournament
No full textWe present the results of an International Computer--Othello Tournament held at the University of Paderborn in October 1993. Furthermore, some participants describe their entries. 1 Organization, Participants and Results The tournament was held at the University of Paderborn (Germany) from October 5th till 7th, 1993. It was thought to be a replacement for the Othello tournament of the Computer-- Olympiad which was canceled this year because David Levy didn't find a sponsor. We called for participation on Internet in July and received many replies. In order to give authors which couldn't come to Paderborn the opportunity to enter their programs we provided PCs and SPARC--stations and found operators for the programs. The entries listed by their start positions were as follows: 1 LOGISTELLO SPARC10 Michael Buro Germany 2 OOT PC486DX-50+Card Markku Poysti Finland 3 DESDEMONA PC286+Card Ola Liljedahl, Sweden Lars Johansson, Ingvar Lindgren 4 MODOT SPARC10 Joel F. Feinstein England 5 MON..
Genreekvilibristen Astrid Lindgren
No full textThe paper examines genre strategies in a number of children’s books by the well-known Swedish author, Astrid Lindgren. Drawing on the reception theories of Hans Robert Jauss, Aidan Chambers and Reinbert Tabbert, the paper demonstrates that the stormy reception of Pippi Longstocking (1945), prompted by a review by Professor John Landquist, had principally genre-related grounds. The book made readers feel a sense of provocation because it challenged their archetextual horizon of expectations by evoking certain traditional genres and simultaneously twisting them in almost anarchic ways. In later books Astrid Lindgren makes a more elaborate use of classic genre structures. She generally chooses one well-known archetext as the generic dominant and allows it to interact with a set of other genres, thus calling forth the main aesthetic effect of the book from the archetextual dialogue between the dominant and the accompanying genres. The paper specifically investigates this polyphonic method in three of Lindgren’s most popular books. In All about the Bullerby children (1947–52) the generic dominant is idyll and the subordinated archetexts satire, parody, burlesque, farce, fairy tale and ballad. Mio, my son (1954) can be considered as an artistic fairy tale (Kunstmärchen), this dominant genre correlating with some other interwoven archetexts: apocryphal gospel, myth, legend, heroic tale and idyll. Finally, the generic dominant of Ronia, the robber’s daughter (1981) – a novel about the adventures of a band of robbers (Räuberroman) – finds its archetextual counterparts in folktale, popular legend, myth, burlesque, fantasy and Bildungsroman, among others
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