Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99


Any time

2016 ( 1 )

2015 ( 7 )

2014 ( 4 )

2013 ( 17 )

Custom range...

Search Results: 1 - 10 of 235 matches for " Janko Binnewies "
All listed articles are free for downloading (OA Articles)
Page 1 /235
Display every page Item
Fragmentation Functions in Next-To-Leading Order QCD
Janko Binnewies
Physics , 1997,
Abstract: We present new sets of fragmentation functions in next-to-leading order QCD that are determined from e+e- annihilation data of inclusive particle production. In addition to the O(alpha_s) unpolarized cross section the longitudinal cross section is also used to extract the gluon fragmentation function from e+e- annihilation data. As the O(alpha_s) vanishes for longitudinal polarized photons (or Z bosons), the O(alpha_s^2) corrections are required to reduce the scale ambiguities. Recently, P.J. Rijken and W.L. van Neerven presented the longitudinal coefficient functions to next-to-leading order. We confirm part of their results in this thesis and complete the calculation by the results for the color class C_F*T_R that must be included for a consistent comparison with LEP1 data. The complete set of coefficient functions is then used together with novel data from ALEPH to determine the fragmentation functions for charged hadrons. This set, and also sets for charged pions, kaons, and D^* mesons as well as neutral kaons published previously, can then be employed to test QCD in e+e- annihilation, photoproduction, gamma-gamma collisions, p-p_bar scattering and DIS. Finally, we suggest how the improved knowledge on the fragmentation in particular of the gluon could be used to determine the gluon and charm content of the photon.
Representations of content: psychological foundations and didactical background
Tomá? Janko
Pedagogicka Orientace , 2012,
Abstract: This theoretical study concerns the issue of representations. Representation is a concept used when analysing and explaining human perception, cognition, communication, and learning. Firstly, we introduce the psychological foundations of the concept. Secondly, we clarify the concept of representations and its division in cognitive psychology. We define two basic forms of external representations - verbal and visual. In social psychology, the concept is used for explaining of how much individual cognition is determined by socio-cultural factors. Further, we mention the concept of representations that draws on the Theory of social representations (Moscovici) and Vygotsky's ideas. The author seeks to develop a concept of representations usable in didactic discourse. The importance of representations for content-oriented didactics is clarified. We also define the levels on which a teacher reasons when using representations during instruction. Representations of curricular content, which are believed to play an important role when presenting the content to students, are also mentioned.
Epitaphios of Jovan, the Metropolitan of Skopje, in the treasury of the Hilandar monastery
Radovanovi? Janko
Zograf , 2006, DOI: 10.2298/zog0731169r
Abstract: The epitaphios of Jovan, the Metropolitan of Skopje, was created between 1346 and 1348. It is unique for its beauty and iconographic program and, at the same time, it is the oldest of the epitaphia preserved in our country. The epitaphios was worn in the course of Holy Liturgy, during the Great Entrance in the cathedral churches and the major monasteries. Metropolitan Jovan presented the epitaphios as a gift to Christ 'my life-giver.' Depicted on its central field is the Epitaphios Threnos (Lamentation at the Tomb). Added around it, at a later time it seems, are bands representing the fourteen scenes of Great Feasts and the officiating Church Fathers, in embroidery. Holy Liturgy is served by the greatest fathers and teachers of the Church and Metropolitan Jovan.
A teratological motif in the ceramoplastic decoration of the Virgin Ljevi ka in Prizren: Iconology of apsidal three-light window
Maglovski Janko
Zograf , 2004, DOI: 10.2298/zog0530119m
Abstract: The author draws attention to two ceramoplastic details, symmetrical in relation to the vertical axis of apsidal three-light window, created at the ends of the band of a series of identical ceramoplastic patterns. Those details were recognized in earlier literature as "two small fish" of baked clay and are considered to be a unique example of this kind of motive in ceramoplastic decoration in Byzantine architecture, and in architecture inspired by it. The author advocates the verbal definition of the image and indicates that the said details can scarcely be described as fish. He finds a new matrix, to which the images correspond, in the linearly depicted heads of snake-like and dragon-like monsters that appear in the repertoire of teratological ornamentation. The author indicates that the altar window of the church of Virgin Ljevi ka in Prizren is encircled by a double asp, a symbol of the evil of this world. He stresses that the design of this altar window is divided into two areas in the iconological sense like the western portals in Studenica and De ani The external represents this sinful world and the internal, symbolized by the victory cross of Christ (IG XC NH Kfl) represents the community of the faithful in Christ, i.e. the side of good. A comparison is drawn for the first time in the text, between the ceramoplastic decoration on the fa ade of the church and the teratological ornamentation on the pages of the book.
The loop and the spike: Toward the structure of interlaced ornaments of Morava school
Maglovski Janko
Zbornik Radova Vizantolo?kog Instituta , 2006, DOI: 10.2298/zrvi0643255m
Abstract: nema
New contribution to studying fresco of Holy Virgin Milkprofferer in Pe
Radovanovi? Janko
Balcanica , 2002, DOI: 10.2298/balc0233253r
Abstract: In the church dedicated to Holy Virgin Odigitria in the Patriarchate of Pe , the foundation of Archepiscope Danilo II, among several images of Virgin Mary the greatest attention of the researchers was attracted by Holy Virgin the Milkprofferer (Nurturer). Mother of God was painted on the southern wall of the narthex, sitting in the throne with the child Christ suckling in her lap. On the left and right side two angels are represented, showing their respect. To the right, three young women or girls approach, greeting her with their arms outstretched. The fresco was painted about 1330. Close links between the theological ideas expressed in the Akathist service (praise to Holy Virgin Odigitria) and the fresco of Holy Virgin the Milkprofferer are evident. Those ideas found their expression also in the fresco of Holy Virgin the Milkprofferer in the monastery Matejci near Kumanovo, painted a quarter of a century later.
Theory of Scanning Tunneling Spectroscopy of Magnetic-Field-Induced Discrete Nodal States in a D-Wave Superconductor
Boldizsar Janko
Physics , 1998, DOI: 10.1103/PhysRevLett.82.4703
Abstract: In the presence of an external magnetic field, the low lying elementary excitations of a d-wave superconductor have quantized energy and their momenta are locked near the node direction. It is argued that these discrete states can most likely be detected by a local probe, such as a scanning tunneling microscope. The low temperature local tunneling conductance on the Wigner-Seitz cell boundaries of the vortex lattice is predicted to show peaks spaced as $\pm \sqrt{n}, n ={0,1,2, ...}$. The $n=0$ peak is anomalous, and it is present only if the superconducting order parameter changes sign at certain points on the Fermi surface. Away from the cell boundary, where the superfluid velocity is nonzero, each peak splits, in general, into four peaks, corresponding to the number of nodes in the order parameter.
Thermodynamic Constraints on the Magnetic Field Dependence of the Neutron Resonance in Cuprate Superconductors
Boldizsar Janko
Physics , 1999,
Abstract: In order to test the recently proposed connection between the neutron resonance and the specific heat anomaly in cuprates, the experimental specific heat data on $YBa_2Cu_3O_{6.93}$ and a theoretical estimate of the single particle fermionic contribution to the specific heat is used to provide an upper bound for the intensity of the neutron peak. The deduced peak intensity is similar in magnitude and temperature dependence to that observed in neutron scattering experiments, and it is constrained to decrease strongly under the influence of moderate magnetic fields oriented along the c-axis of the crystal. An explanation is proposed for the predicted suppression, based on the observation that the resonance intensity is very sensitive to superconducting phase correlations.
Relative structure cycles and the existence of smooth Lyapunov 1-forms for flows
Janko Latschev
Mathematics , 2004,
Abstract: We give necessary and sufficient conditions for the existence of smooth Lyapunov 1-forms for the flow of a smooth vector field in terms of the behavior of certain locally finite invariant measures. The main statement generalizes a result of Schwartzman, whereas the methods are adapted from work of Sullivan.
Mirror symmetry and tropical geometry
Janko Boehm
Mathematics , 2007,
Abstract: Using tropical geometry we propose a mirror construction for monomial degenerations of Calabi-Yau varieties in toric Fano varieties. The construction reproduces the mirror constructions by Batyrev for Calabi-Yau hypersurfaces and by Batyrev and Borisov for Calabi-Yau complete intersections. We apply the construction to Pfaffian examples and recover the mirror given by Rodland for the degree 14 Calabi-Yau threefold in PP^6 defined by the Pfaffians of a general linear 7x7 skew-symmetric matrix. We provide the necessary background knowledge entering into the tropical mirror construction such as toric geometry, Groebner bases, tropical geometry, Hilbert schemes and deformations. The tropical approach yields an algorithm which we illustrate in a series of explicit examples.
Page 1 /235
Display every page Item

Copyright © 2008-2017 Open Access Library. All rights reserved.