143,106 research outputs found
The Feynman path integral quantization of constrained systems
No full textThe Feynman path integral for constrained systems is constructed using the canonical formalism introduced by Guler. This approach is applied to a free relativistic particle and Christ-Lee model
The Feynman path integral quantization of constrained systems
No full textThe Feynman path integral for constrained systems is constructed using the canonical formalism introduced by Guler. This approach is applied to a free relativistic particle and Christ-Lee model
Couple stress effects in a thin film bonded to a half-space
No full textThis study investigates the contact mechanics of a thin film laying on an elastic substrate within the context of couple-stress elasticity. It aims to introduce the effects of material internal length scale, which has proven an effective way of modeling structures at micro to nano-scales, allowing to capture their size dependent behavior. Specifically, stress analysis for a thin film bonded to a couple stress elastic half-space is considered under plane strain loading conditions by assuming that both shear stress and couple tractions are exchanged between the thin film and the substrate. The problem is converted to a singular integral equation, which is solved by expanding the shear stress tractions as a Chebyshev series. The results show that the introduction of couple tractions decreases the shear stress tractions and the axial load in the thin film. When the characteristic length is sufficiently small, but still finite, the results for classical elastic behavior are approached
Quistes de dinoflagelados del Cretácico temprano de las cuencas Neuquina y Austral: bioestratigrafía y paleobiogeografía
No full textSe documentaron y recopilaron los registros más relevantes de los quistes de dinoflagelados de pared orgánica provenientes del Cretácico inferior de las cuencas Neuquina y Austral en diferentes localidades de estudio. La mayoría de estos registros han contribuido a las interpretaciones paleoambientales, bioestratigráficas y paleobiogeográficas de diferentes sucesiones sedimentarias marinas en ambas cuencas. Las asociaciones de quistes de dinoflagelados provienen de las Formaciones Springhill, Rio Mayer Superior, Piedra Clavada, Kachaike y “Margas Verdes” de la cuenca Austral y, de la parte superior de la Formación Vaca Muerta y de la Formación Agrio de la cuenca Neuquina, varias de estas unidades estratigráficas conforman los principales sistemas petroleros de ambas cuencas.The present work documents and gathers the most relevant records of the organic-walled dinoflagellate cysts from different sites of the Neuquén and Austral Basins. Most of these records have contributed to the palaeoenvironmental, biostratigraphical and palaeobiogeographical interpretations of the different stratigraphical units in both basins. The dinoflagellate cysts assemblages come from the Springhill, Upper Rio Mayer, Piedra Clavada, Kachaike and Margas Verdes Formation of the Austral Basin and, from the upper part of the Vaca Muerta Formation and the Agrio Formation of the Neuquen Basin, several of these stratigraphical units conform the main petroleum systems in both basins.Fil: Guler, Maria Veronica. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; ArgentinaFil: Paolillo, Melisa Andrea. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; ArgentinaFil: Martz, Paula Anabela. Universidad de Buenos Aires; Argentin
Spatially-localized time dependent solutions including turbulence and their interactions in 2D Kolmogorov flow
No full textIn 2D Kolmogorov flow in small aspect ratio domains, spatially-localized solutions such as kink, traveling or time-dependent kink-antikink pars coexist. However, the conservation of the flow rate in the y direction strongly restrict combination of localized solutions and their positioning. We find that by adding a homogeneous flow U y their positioning is controlled and each of localized solutions including a spatially-localized chaos is isolated. Numerical results suggest that these isolated solutions can be elements constructing a whole flow
A COMPARATIVE ANALYSIS OF GAME THEORY MODELS FOR ASSESSING THE PERFORMANCES OF NETWORK CONSTRAINED ELECTRICITY MARKETS
No full textCharacterizations Of The Barrier Parameter Of Homogeneous Convex Cones
No full textWe characterize the barrier parameter of the optimal self--concordant barriers for homogeneous cones. In particular, we prove that for homogeneous convex cones this parameter is the same as the rank of the corresponding Siegel domain and also the same as the Carath'eodory number of the cone. Keywords: Homogeneous cones, barrier functions, self--concordance, rank, Carath'eodory number AMS Subject Classification: 90C25, 90C60, 90C05, 65Y20, 52A41 Department of Mathematics and Statistics, University of Maryland Baltimore County, Baltimore, Maryland 21228, U.S.A. (e-mail: [email protected]). Research partially supported by the National Science Foundation under grant DMS--9306318. y Department of Combinatorics and Optimization, Faculty of Mathematics, University of Waterloo, Waterloo, Ontario, N2L 3G1 Canada (e-mail: [email protected]). Research partially supported by an operating grant from NSERC of Canada. BARRIER PARAMETER 2 1 Introduction The book by Nesterov and Nem..
Characteristics of overlap region in high-Reynolds number turbulent channel flow
No full textDirect numerical simulation of the fully developed turbulent channel flows have been carried out at the Reynolds number based on the friction velocity and the channel half width, 2000, 4000 and 8000. A hybrid 10th order accurate finite difference scheme in the stream and spanwise directions, and a second-order scheme in the wall-normal direction is adapted as the spatial discretization method. We observed the plateau profiles in the indicator function corresponded to the von Karman constant. Furthermore, second peak of streamwise pre-multiplied spectra were appeared in the same wall normal height, 300 < y+ < 600, in case of Re = 4000. Nevertheless, the effects of the lager than the channel half height scale on the streamwise turbulent intensity are fixed contributions without dependence on Reynolds number. These results suggested that the new streamwise vortexes are formed between buffer layer and outer layer with increasing of Reynolds number
Digital Hadron Calorimetry
No full text2021 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2021 -- 16 October 2021 through 23 October 2021 -- 182674Calorimeters that can fully exploit the power of Particle Flow Algorithms, which attempt to measure each particle in a hadronic jet individually, emphasize spatial granularity over single particle energy resolution. In this context, the CALICE collaboration developed the Digital Hadron Calorimeter. The Digital Hadron Calorimeter uses Resistive Plate Chambers as active media and is read out with 1 x 1 cm2 pads and digital (1-bit) resolution. The Digital Hadron Calorimeter went through a broad beam test program over several years to yield a unique dataset of electromagnetic and hadronic interactions with unprecedented spatial resolution. In addition to conventional calorimetry, the Digital Hadron Calorimeter offers detailed measurements of event shapes, rigorous tests of simulation models and various analytical tools to improve calorimetric performance. Here we report on the results from the analysis of DHCAL data and comparisons with the Monte Carlo simulations across various test campaigns. © 2021 IEEE.B. Bilki and Y. Guler acknowledge support under Tübitak grant no 118C224
La 'circunstancia' de 'Herederos y Pretendientes
No full textIn June 2010, the Ortega y Gasset Foundation hosted a Conference about the “Spanish Philosophical Transition” in order to debate the book of Francisco Vázquez, La filosofía española. Herederos y Pretendientes. Una lectura sociológica (1963-1990), recently published. This paper is the author’s response to criticism raised in the Conference and to published reviews received by this book. First, the author summarized the argument of Herederos y pretendientes. Secondly he responds and takes into account the most important objections against the book’s hypothesis and methodology. Finally the author evaluates the favorable judgments received by the book and suggests the limits of the historian’s task.Fundación Ortega y Gasset-Marañó
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