Peter Jonas – författare

Masterarbeit aus dem Jahr 2021 im Fachbereich Kunst - Allgemeines, Kunsttheorie, Note: 1,0, , Sprache: Deutsch, Abstract: Die Arbeit behandelt das Fotogramm als Medium der Abstraktion in der klassischen Moderne. Der Autor unterteilt die Geschichte des Fotogramms in drei Phasen, die durch zwei lange Pausen unterbrochen werden. Im 19. Jhd. diente die Technik zur wissenschaftlichen Dokumentation. Die zweite Phase, die von Christian Schad, Man Ray und Moholy-Nagy eingeleitet wurde, beginnt gleichzeitig mit dem Aufschwung abstrakter Bildstrategien. Die Hypothese, das Fotogramm sei für Abstraktionen besonders geeignet, wird geprüft. Seine Anwendung in der sogenannten Klassischen Moderne, dem Zeitraum vom Untergang der Belle Époque bis in die Mitte des 20. Jahrhunderts, wird anhand einer Analyse programmatischer Ansprüche und praktischer Bildbeispiele aus Dadaismus, Surrealismus und Neuem Sehen beschrieben. Dabei stand nicht eine Intensivierung des Ausdrucks durch Reduktion im Mittelpunkt, dies wurde erst beim zweiten Comeback des Fotogramms in der Postmoderne ein Beweggrund. Es ging vielmehr um die Suche nach Wegen einer Bilderzeugung ohne den Einfluss des Menschen, um zu einer unmittelbaren Weltwahrnehmung und Welterkenntnis zu gelangen. In Anlehnung an die Écriture automatique wird der Zufall als Gestaltungsmittel gegen den inneren Zensor eingesetzt. Die Eigenschaften der Materie und ihre visuellen Relationen sollen unverfälscht quasi von selbst sprechen. Weil damit auch ein Sichtbarwerden des Optisch-Unbewussten verbunden ist, kommt der Bewegung des Neuen Sehens auch eine aufklärerische und pädagogische Bedeutung zu. Das fotogrammatische Bild wird eingebettet in eine materialistische Ideologie als neue Acheiropoieta, als nicht von Menschenhand geschaffen, gesehen; eine Objektmetaphysik, der bereits bei Talbot auftaucht. Mit dem Tod von Moholy-Nagy 1946 beginnt die zweite Latenzzeit des Fotogramms, die erst in den 1980er endet.

It is now widely accepted that glutamate is the major excitatory neurotrans- mitter in the mammalian central nervous system. The main criteria for accept- ing a molecule as a chemical transmitter appear to be fulfilled at several synapses: Glutamate mimics the action of the natural transmitter in the post- synaptic neuron (CURTIS et al. 1959), glutamate is present in presynaptic ele- ments (OTTERSEN and STORM-MATHISEN 1984), and glutamate is released from central neurons in an activity-dependent manner (BRADFORD 1970). The postsynaptic receptors that mediate the effects of glutamate are markedly diverse. Based on their activation by agonists that act more selec- tively than the natural transmitter itself, a-amino-3-hydroxy-5-methyl- isoxazolepropionate (AMPA) receptors, kainate receptors, and N-methyl-D- aspartate (NMDA) receptors can be distinguished. Molecular cloning has revealed additional structural diversity. To date, almost 20 glutamate receptor subunit genes have been identified, and an even larger number of splice vari- ants and edited versions are present in the mammalian brain. Analysis of synaptic transmission revealed that "the" excitatory synapse does not exist.Glutamatergic synapses in different circuitries differ substan- tially in their signaling properties, although they use the same transmitter. We have learned that cellular, subcellular, and molecular factors determine synap- tic function, and that glutamate receptor subunit diversity is of direct relevance in shaping the unique signaling properties of a glutamatergic synapse.

It is now widely accepted that glutamate is the major excitatory neurotrans- mitter in the mammalian central nervous system. The main criteria for accept- ing a molecule as a chemical transmitter appear to be fulfilled at several synapses: Glutamate mimics the action of the natural transmitter in the post- synaptic neuron (CURTIS et al. 1959), glutamate is present in presynaptic ele- ments (OTTERSEN and STORM-MATHISEN 1984), and glutamate is released from central neurons in an activity-dependent manner (BRADFORD 1970). The postsynaptic receptors that mediate the effects of glutamate are markedly diverse. Based on their activation by agonists that act more selec- tively than the natural transmitter itself, a-amino-3-hydroxy-5-methyl- isoxazolepropionate (AMPA) receptors, kainate receptors, and N-methyl-D- aspartate (NMDA) receptors can be distinguished. Molecular cloning has revealed additional structural diversity. To date, almost 20 glutamate receptor subunit genes have been identified, and an even larger number of splice vari- ants and edited versions are present in the mammalian brain. Analysis of synaptic transmission revealed that "the" excitatory synapse does not exist.Glutamatergic synapses in different circuitries differ substan- tially in their signaling properties, although they use the same transmitter. We have learned that cellular, subcellular, and molecular factors determine synap- tic function, and that glutamate receptor subunit diversity is of direct relevance in shaping the unique signaling properties of a glutamatergic synapse.

rd This volume contains papers written by the participants of the 3 Workshop on Operator Theory in Krein spaces and Nonlinear Eigenvalue Problems, held at the Technische Universit. at Berlin, Germany, December 12 to 14, 2003. The workshop covered topics from spectral, perturbation and extension t- ory of linear operators in Krein spaces. They included generalized Nevanlinna functions and related classes of functions, boundary value problems for di?erential operators, spectral problems for matrix polynomials, and perturbation problems forsecondorderevolutionequations.Alltheseproblemsarere?ectedinthepresent volume. The workshop was attended by 46 participants from 12 countries. It is a pleasure to acknowledge the substantial ?nancial support received from the - Research Training Network HPRN-CT-2000-00116 "Analysis and Operators" by the European Community, - DFG-Forschungszentrum MATHEON "Mathematik fur .. Schlussel- .. technologien", - Institute of Mathematics of the Technische Universit. at Berlin. We would also like to thank Petra Grimberger for her great help.Last but not least, special thanks are due to Jussi Behrndt, Christian Mehl and Carsten Trunk for their excellent workin the organisationof the workshopand the preparationof this volume. Without their assistance the workshop might not have taken place. The Editors Operator Theory: Advances and Applications, Vol. 162, 1-17 c 2005 Birkh. auser Verlag Basel/Switzerland Partial Non-stationary Perturbation Determinants for a Class of J-symmetric Operators Vadim Adamyan, Peter Jonas and Heinz Langer Abstract. We consider the partial non-stationary perturbation determinant (1) itA ?itH ? (t):=det e P e ,t? R.

This volume contains contributions written by participants of the 4th Workshop on Operator Theory in Krein Spaces and Applications, which was held at the TU Berlin, Germany, December 17 to 19, 2004. The workshop covered topics from spectral, perturbation and extension theory of linear operators and relations in inner product spaces, including spectral analysis of differential operators, the theory of generalized Nevanlinna functions and related classes of functions, spectral theory of matrix polynomials, and problems from scattering theory.