4,025 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
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..
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
4 DOFs hollow soft pneumatic actuator – HOSE
No full textThis study reports a novel Hollow Soft Pneumatic Actuator (HOSE), which exhibits 4 degrees of freedom (DOFs). The design consists of a central hollow cylinder surrounded by four twisting symmetric chambers. By virtue of their spiral disposition, each chamber produces a diagonal force along the hollow internal cylinder composed of two components: one parallel to the Z axis and the other one to the plane X-Y. Both top and bottom sections of the actuator are reinforced to avoid deformation, essential for optimal function and dexterity of HOSE. Different movements of the actuator are produced by varying the activation combinations of the 4 chambers. They are constructed from thin walled (0.5 mm) Ecoflex 00-30 super soft silicon rubber, enabling HOSE to perform controlled movements with low pressure not exceeding 35 kPa.HOSE exhibits a maximal extension of 230% of its original length, bends up to i) ±90° around X axis, ii) ±115° around Yaxis, and iii) twists around Z axis with a total range of ±35°. The paper describes the manufacturing process together withthe actuator performance, reporting the range of motion along each DOF related to the internal pressure, volume vs. forces and torques produced along each axis
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
Neogene palynology of the Cx-1 well, Colorado Basin, Argentina
No full textLa sección Neógena de la perforación Cx-1, localizada en el área de plataforma de la Cuenca del Colorado, es portadora de asociaciones palinológicas caracterizadas por abundante material de origen continental. El predominio de polen y esporas con un buen grado de preservación y la presencia de algas chlorococcales, asociado a la escasez de quistes de dinoflagelados, sugieren que estos depósitos se acumularon en un ambiente marino de aguas someras, cercano a la costa. A partir del contenido de esporomorfos se hace referencia a las comunidades vegetales que se desarrollaron en las áreas próximas a la cuenca de depositación. Los datos palinológicos indican un cambio paleoambiental relacionado con la caída del nivel del mar ocurrida en el Mioceno tardío. Se describen sistemáticamente 39 especies de esporas y granos de polen provenientes del intervalo estudiado. Se propone una nueva combinación: Equisetosporites fusiformis (Shakmundes) comb. nov.[Neogene palynology of the Cx-1 well, Colorado Basin, Argentina]. Abundant and diverse paly-nological assemblages characterize the Neogene marine section in the Cx-1 well, offshore Colorado Basin. The dominance of well-preserved pollen and spores as well as the presence of chlorococcaleans algae, together with the scarcity of dinoflagellate cysts, suggests that these deposits accumulated in marine shallow waters near the shoreline. The sporomophs content reflects the type of vegetation growing in the vicinity of the depositional basin. The palynological assemblages indicate a paleoevi¬ronmental change related to a drop of sea level during the Late Miocene. This paper contains syste¬matic descriptions of 39 spores and pollen species recovered from the studied interval. A new combination, Equisetosporites fusiformis (Shakmundes) com. nov. is here proposed.Fil: Guler, Maria Veronica. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca; Argentina. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas; Argentina. Universidad Nacional del Sur. Departamento de Geología; ArgentinaFil: Guerstein, Gladys Raquel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca; Argentina. Universidad Nacional del Sur. Departamento de Geología; ArgentinaFil: Quattrocchio, Mirta Elena. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca; Argentina. Universidad Nacional del Sur. Departamento de Geología; Argentin
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