82,648 research outputs found
Klein Tunneling in Graphene p-n-p Junctions
No full textWe study the effect of the Klein tunneling on the transport properties of graphene p-n-p junctions. We first analyze the ideal case of a clean system and then study the realistic case in which disorder is present. To take into account the effect of disorder we develop a method for obtaining quantum transport properties in graphene that uniquely combines three crucial features: microscopic treatment of charge disorder, fully quantum mechanical analysis of transport, and the ability to model experimentally relevant system sizes. Our results allow us to conclude unambiguously that recent transport experiments on graphene p-n-p junctions have indeed observed signatures of Klein tunneling. The analysis presented is based on Rossi et al. Phys. Rev. B 81, 121408R.</jats:p
Nouvelles Puces de Madagascar, Paractenopsyllus randrianasoloi n. sp., P. albignaci n. sp. et Dinopsyllus tsaratananae n. sp. [Siphonaptera]
No full textKlein Jean-Marie. Nouvelles Puces de Madagascar, Paractenopsyllus randrianasoloi n. sp., P. albignaci n. sp. et Dinopsyllus tsaratananae n. sp. [Siphonaptera]. In: Bulletin de la Société entomologique de France, volume 72 (9-10), Novembre-décembre 1967. pp. 300-310
Van stapelmarkt tot welvaartsstaat, P. W. Klein
No full textMorineau Michel. Van stapelmarkt tot welvaartsstaat, P. W. Klein. In: Annales. Économies, Sociétés, Civilisations. 27ᵉ année, N. 1, 1972. pp. 85-86
On the order of automorphism groups of Klein surfaces
No full textA problem of special interest in the study of automorphism groups of surfaces are the bounds of the orders of the groups as a function of the genus of the surface. May has proved that a Klein surface with boundary of algebraic genus p has at most 12(p–1) automorphisms. In this paper we study the highest possible prime order for a group of automorphisms of a Klein surface. This problem was solved for Riemann surfaces by Moore in. We shall use his results for studying the Klein surfaces that are not Riemann surfaces. The more general result that we obtain is the following: if X is a Klein surface of algebraic genus p, and G is a group of automorphisms of X, of prime order n, then n ≤ p + 1.Depto. de Álgebra, Geometría y TopologíaFac. de Ciencias MatemáticasTRUEpu
The role of imagination in Bergman, Klein and Sartre
Full text linkThis thesis was submitted for the degree of Doctor of Philosophy and was awarded by Brunel UniversityThis thesis provides an inter-disciplinary study of selected works by Ingmar Bergman. I explore how key concepts from Melanie Klein and Jean-Paul Sartre apply to the focus on characters in a state of heightened imagination; and the value placed on imagination in the construction of these films. This involves recognition of the way an active response from the viewer is encouraged.
Klein, Sartre and Bergman also attend to contextual factors that challenge any notion of subjectivity as sovereign and the power of imagination is frequently placed in a social context. All three figures develop their ideas within specialised fields drawing on the influence of others. Chapter 2 shows how Klein’s ideas relate to the influence of Freud before exploring how her work can be applied to Bergman’s films through the example of Wild Strawberries. Chapter 3 concentrates on Sartre’s early work, The Imaginary and considers how this is significant in relation to some of Sartre’s better-known philosophical ideas developed during and after the Second World War. These ideas will lead to an exploration of The Seventh Seal.
Chapters 4, 5, and 6 focus on three films from distinct parts of Bergman’s career: Summer with Monika, The Virgin Spring and Hour of the Wolf. In Chapter 4 this will be preceded by a brief over-view of three more films from the early part of Bergman’s career. These chapters explore how Kleinian and Sartrean ideas can be incorporated in close analysis, and alongside selected critical responses to the films. The analysis integrates key points from Klein and Sartre in a methodology specific to film studies. This will include analysis of cinematic elements such as camera work and lighting, and recognition of narrative structure and character developmen
Search for Kaluza-Klein graviton emission in p(p)over-bar collisions at root s=1.8 TeV using the missing energy signature
Full text linkWe report on a search for direct Kaluza-Klein graviton production in a data sample of 84 pb(-1) of p (p) over bar collisions at roots=1.8 TeV, recorded by the Collider Detector at Fermilab. We investigate the final state of large missing transverse energy and one or two high energy jets. We compare the data with the predictions from a (3+1+n)-dimensional Kaluza-Klein scenario in which gravity becomes strong at the TeV scale. At 95% confidence level (C.L.) for n=2, 4, and 6 we exclude an effective Planck scale below 1.0, 0.77, and 0.71 TeV, respectively
A psychoanalytic concept illustrated: Will, must, may, can — revisiting the survival function of primitive omnipotence
Full text linkThe author explores the linear thread connecting the theory of Freud and Klein, in terms of the central significance of the duality of the life and death instinct and the capacity of the ego to tolerate contact with internal and external reality. Theoretical questions raised by later authors, informed by clinical work with children who have suffered deprivation and trauma in infancy, are then considered. Theoretical ideas are illustrated with reference to observational material of a little boy who suffered deprivation and trauma in infancy. He was first observed in the middle of his first year of life while he was living in foster care, and then later at the age of two years and three months, when he had been living with his adoptive parents for more than a year
The Etiology of Generalized Osteoporosis in Rheumatoid Arthritis
Full text linkKlein Nulend, J. [Promotor]Luyten, F.P. [Promotor]Bravenboer, N. [Copromotor]Bakker, A.D. [Copromotor]Verschueren, P. [Copromotor
Minimal genus of Klein surfaces admitting an automorphism of a given order
No full textLet K be a compact Klein surface of algebraic genus which is not a classical Riemann surface. The authors show that if K admits an automorphism of order then it must have algebraic genus at least (p\sb 1-1)N/p\sb 1 if N is prime or if its smallest prime factor, p\sb 1, occurs with exponent 1 in N. Otherwise the genus is at least (p\sb 1-1)(N/p\sb 1-1). This result extends to bordered Klein surfaces a result of {\it E. Bujalance} [Pac. J. Math. 109, 279-289 (1983)] and is the analog for Klein surfaces of a result of {\it W. J. Harvey} [Q. J. Math., Oxf. II. Ser. 17, 86-97 (1966)] and, ultimately, of {\it A. Wiman} [Kongl. Svenska Vetenskaps-Akad. Handl., Stockholm 21, No.1 and No.3 (1895)].Comisión Asesora de Investigación Cientifica y TécnicaDepto. de Álgebra, Geometría y TopologíaFac. de Ciencias MatemáticasTRUEpu
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