Bibliografías temáticas / KT boundary

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Literatura académica sobre el tema "KT boundary"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 1 de febrero de 2022

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Artículos de revistas sobre el tema "KT boundary"

Ekdale, A. A. y Wolfgang Stinnesbeck. "Trace Fossils in Cretaceous-Tertiary (KT) Boundary Beds in Northeastern Mexico: Implications for Sedimentation during the KT Boundary Event". PALAIOS 13, n.º 6 (diciembre de 1998): 593. http://dx.doi.org/10.2307/3515350.

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Rho, Mina, Mo Zhou, Xiang Gao, Sun Kim, Haixu Tang y Michael Lynch. "Independent Mammalian Genome Contractions Following the KT Boundary". Genome Biology and Evolution 1 (1 de enero de 2009): 2–12. http://dx.doi.org/10.1093/gbe/evp007.

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Chen, Kongtao, David J. Srolovitz y Jian Han. "Grain-boundary topological phase transitions". Proceedings of the National Academy of Sciences 117, n.º 52 (14 de diciembre de 2020): 33077–83. http://dx.doi.org/10.1073/pnas.2017390117.

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The formation and migration of disconnections (line defects constrained to the grain boundary [GB] plane with both dislocation and step character) control many of the kinetic and dynamical properties of GBs and the polycrystalline materials of which they are central constituents. We demonstrate that GBs undergo a finite-temperature topological phase transition of the Kosterlitz–Thouless (KT) type. This phase transition corresponds to the screening of long-range interactions between (and unbinding of) disconnections. This phase transition leads to abrupt changes in the behavior of GB migration, GB sliding, and roughening. We analyze this KT transition through mean-field theory, renormalization group theory, and kinetic Monte Carlo simulations and examine how this transition affects microstructure-scale phenomena such as grain growth stagnation, abnormal grain growth, and superplasticity.

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Premovic, Pavle, Nikola Nikolic, Ivana Tonsa, Dejan Dulanovic y Mirjana Pavlovic. "Cretaceous-tertiary boundary layer at Stevns Klint (Denmark): Copper and copper(II) porphyrins". Journal of the Serbian Chemical Society 64, n.º 5-6 (1999): 349–58. http://dx.doi.org/10.2298/jsc9906349p.

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High concentrations (up to 4000 ppm) of copper(II) porphyrins have been detected in the kerogen of the Cretaceous/Tertiary (KT) boundary informal type sediment, the Fish Clay, at Stevns Klint, Denmark. These pigments have also been found in the Danish KT sediment at Nye Kl?v, which is about 300 km away from Stevns Klint. However, copper(II) porphyrins cannot be detected in the Danich boundary rock of the Dania site, which is separated from Stevns Klint by about 200 km. It is proposed that the kerogen copper(II) porphyrins are derived from humic materials of terrestrial (peat/soil) sources already enriched with these compounds, which were redeposited in the Danish KT boundary Basin. In addition, our results show that the kerogen copper(II) porphyrins are present, for comparison, in the Permian Kupferschiefer shale from Poland. The amounts are comparable to those in the Fish Clay kerogen. To our opinion, the same processes responsible for the kerogen copper(II) porphyrin enrichment have occurred in the Stevns Klint KT boundary sediment and in the Kupferschiefer.

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Evans, Robert. "Kafka, New Orleans, the OARs and the KT Boundary". Healthcare Policy | Politiques de Santé 1, n.º 2 (15 de enero de 2006): 14–20. http://dx.doi.org/10.12927/hcpol.2006.17871.

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OLDS, Peter, Mathew E. SANBORN, Tim TEAGUE y Qingzhu YIN. "KT Boundary Chromites Determined to be Terrestrial: Cr Isotopic Evidence for Excavation and Ejection of Mafic/Ultramafic Rocks by the KT Boundary Impact". Acta Geologica Sinica - English Edition 91, s1 (mayo de 2017): 26–27. http://dx.doi.org/10.1111/1755-6724.13163.

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Premovic, Pavle. "Cretaceous-Tertiary boundary deposits in Denmark: A diachroneity". Journal of the Serbian Chemical Society 69, n.º 7 (2004): 555–61. http://dx.doi.org/10.2298/jsc0407555p.

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The lateral distribution of predominantly terrestrial kerogen or humics enriched with copper(II) porphyrins (Cu-P) across the Danish marine basin implies that the alleged Cretaceous-Tertiary (KT) boundary deposits in western Denmark (at the Nye Kl?v/Dania locations)were probably formed by erosion/emplacement of the boundary clay (Fiskeler) in eastern Denmark by marine currents, as originally proposed by Hulteberg.1,2.

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Premovic, Pavle, Bratislav Todorovic, Nikola Nikolic, Mirjana Pavlovic, Dragan Djordjevic y Dejan Dulanovic. "Geochemistry of Ni in the Cretaceous-Tertiary succession Fiskeler (Fish Clay) at Stevns Klint (Denmark): cheto-smectite of the black marl". Journal of the Serbian Chemical Society 71, n.º 6 (2006): 639–59. http://dx.doi.org/10.2298/jsc0606639p.

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The Cretaceus-Tertiary (KT) boundary at Stevns Klint (the H?jerup succession), Fiskeler, consists of a thin red clay layer overlain by a thick one of black marl. These two layers are made up mainly from cheto-smectite and biogenic calcite. The black marl shows an enhanced concentration of Ni (655 ppm) within its smectite fraction. Additionally, its carbonate fraction also shows an enhanced concentration of Ni (245 ppm). It is reasoned that these enrichments represent a sudden and rapid input of high amounts of Ni into the late Cretaceus seawater at Stevns Klint. The ultimate source of Ni in both the carbonate and smectite fractions of the black marl was probably impact fallout, produced by the KT asteroidal impact, deposited on the nearby soil and leached by the (acid) surface waters. The geochemistry of the Ni supports the hypothesis that the smectite of this marl most likely has a local (marine or terrestrial) provenance and was probably redeposited, after its formation, from the original site to its present location at the KT boundary.

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Sun, Dazhi, Xianling Dong y Yongling Wang. "Temperature dependence of Kt, in piezoelectric ceramics near F-AF phase boundary". Ferroelectrics Letters Section 15, n.º 5-6 (junio de 1993): 121–26. http://dx.doi.org/10.1080/07315179308204248.

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Stinnesbeck, W., G. Keller, T. Adatte, D. Stuben, U. Kramar, Z. Berner, C. Desremeaux y E. Moliere. "Beloc, Haiti, revisited: multiple events across the KT boundary in the Caribbean". Terra Nova 11, n.º 6 (10 de diciembre de 1999): 303–10. http://dx.doi.org/10.1046/j.1365-3121.1999.00263.x.

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Más fuentes

Tesis sobre el tema "KT boundary"

Gaylor, Jonathan. "40Ar/39Ar Dating of the Late Cretaceous". Phd thesis, Université Paris Sud - Paris XI, 2013. http://tel.archives-ouvertes.fr/tel-01017165.

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As part of the wider European GTS Next project, I propose new constraints on the ages of the Late Cretaceous, derived from a multitude of geochronological techniques, and successful stratigraphic interpretations from Canada and Japan. In the Western Canada Sedimentary Basin, we propose a new constraint on the age of the K/Pg boundary in the Red Deer River section (Alberta, Canada). We were able to cyclostratigraphically tune sediments in a non-marine, fluvial environment utilising high-resolution proxy records suggesting a 11-12 precession related cyclicity. Assuming the 40Ar/39Ar method is inter-calibrated with the cyclostratigraphy, the apparent age for C29r suggests that the K/Pg boundary falls between eccentricity maxima and minima, yielding an age of the C29r between 65.89 ± 0.08 and 66.30 ± 0.08 Ma. Assuming that the bundle containing the coal horizon represents a precession cycle, the K/Pg boundary is within the analytical uncertainty of the youngest zircon population achieving a revised age for the K/Pg boundary as 65.75 ± 0.06 Ma. The Campanian - Maastrichtian boundary is preserved in the sedimentary succession of the Horseshoe Canyon Formation and has been placed ~8 m below Coal nr. 10. Cyclostratigraphic studies show that the formation of these depositional sequences (alternations) of all scales are influenced directly by sea-level changes due to precession but more dominated by eccentricity cycles proved in the cyclostratigraphic framework and is mainly controlled by sand horizons, which have been related by autocyclicity in a dynamic sedimentary setting. Our work shows that the Campanian - Maastrichtian boundary in the Western Canada Sedimentary Basin coincides with ~2.5 eccentricity cycles above the youngest zircon age population at the bottom of the section and ~4.9 Myr before the Cretaceous - Palaeogene boundary (K/Pg), and thus corresponds to an absolute age of 70.65 ± 0.09 Ma producing an ~1.4 Myr younger age than recent published ages. Finally, using advances with terrestrial carbon isotope and planktonic foraminifera records within central Hokkaido, Northwest Pacific, sections from the Cretaceous Yezo group were correlated to that of European and North American counterparts. Datable ash layers throughout the Kotanbetsu and Shumarinai section were analysed using both 40Ar/39Ar and U-Pb methods. We successfully dated two ash tuff layers falling either side of the Turonian - Coniacian boundary, yielding an age range for the boundary between 89.31 ± 0.11 Ma and 89.57 ± 0.11 Ma or a boundary age of 89.44 ± 0.24 Ma. Combining these U-Pb ages with recent published ages we are able to reduce the age limit once more and propose an age for the Turonian - Coniacian boundary as 89.62 ± 0.04 Ma.

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Capítulos de libros sobre el tema "KT boundary"

Claeys, Philippe. "KT Boundary". En Encyclopedia of Astrobiology, 1340–41. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-44185-5_842.

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Claeys, Philippe. "KT Boundary". En Encyclopedia of Astrobiology, 1–2. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-27833-4_842-2.

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Claeys, Philippe. "KT Boundary". En Encyclopedia of Astrobiology, 891–92. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-11274-4_842.

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Kiessling, Wolfgang y Philippe Claeys. "A Geographic Database Approach to the KT Boundary". En Geological and Biological Effects of Impact Events, 83–140. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-642-59388-8_5.

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Devaraj, N., S. Chidambaram, Banajarani Panda, C. Thivya, K. Tirumalesh y R. Thilagavathi. "Determination of Anthropogenic Sources in the Groundwater Chemistry Along KT Boundary of South India". En Emerging Issues in the Water Environment during Anthropocene, 127–42. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-32-9771-5_7.

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"Cretaceous/Tertiary Boundary (KT)". En Encyclopedia of Astrobiology, 585. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-44185-5_100257.

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Actas de conferencias sobre el tema "KT boundary"

Insinna, Massimiliano, Duccio Griffini, Simone Salvadori y Francesco Martelli. "Conjugate Heat Transfer Analysis of a Film Cooled High-Pressure Turbine Vane Under Realistic Combustor Exit Flow Conditions". En ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-25280.

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In this paper conjugate heat transfer analysis of the cooled vane of the MT1 research high-pressure stage is presented. Inlet boundary conditions (including non-uniform total temperature, non-uniform total pressure, swirl, turbulence intensity and turbulence length scale) are obtained considering the exit flow field of a reactive annular combustor simulator. The combustor model has been designed in order to reproduce data available in literature about exit profiles of real combustion chambers and other combustor simulators. Steady simulations are performed on a hybrid unstructured grid obtained from a grid dependence study. The transitional kT-kL-ω model by Walters and Cokljat is used as turbulent closure. Thermal fields obtained from CHT analysis of the vane considering two different clocking positions with respect to the combustor are compared. Results, including film cooling parameters and High-Pressure Vane aerodynamics, are also compared with a uniform inlet case showing the crucial importance of considering realistic boundary conditions for thermal analysis of turbine components.

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Azimi, S. "In-Plane Vibration of Simply Supported-Simply Supported Circular Ring Segments". En ASME 1991 Design Technical Conferences. American Society of Mechanical Engineers, 1991. http://dx.doi.org/10.1115/detc1991-0287.

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Abstract The general in-plane vibration problem of circular ring segments having linear and torsional elastic constraints at the ends has been studied. One of the interesting cases of concern for which there exists an exact solution is the case where the linear and torsional spring stiffnesses in the circumferential direction become zero (Ku = 0, Kt = 0) and the linear spring stiffness in the radial direction becomes infinity (Kw = ∞). This case is the so-called simply supported-simply supported case. The general form of the equations of motion of circular rings with the proper boundary conditions at the ends have been employed to investigate the vibration of the ring segment. Results for natural frequencies and mode shapes for different angles of the segment have been presented.

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Marti´nez-Calle, Julia´n, Laureano Balbona-Calvo, Jose´ Gonza´lez-Pe´rez y Eduardo Blanco-Marigorta. "An Open Water Numerical Model for a Marine Propeller: A Comparison With Experimental Data". En ASME 2002 Joint U.S.-European Fluids Engineering Division Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/fedsm2002-31187.

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The open water model tests technique is well known and commonly used to predict propellers performance. In this paper, a quite different approach is intended and the main propeller variables are numerically modelled using a finite volume commercial code. Particularly, a fishing-boat propeller is numerically treated using a three-dimensional unstructured mesh. Mesh dependency and different turbulent models are considered together with an sliding technique to account for the rotation. Typical turbomachinery boundary conditions for a volume containing the propeller are imposed (inlet velocity and outlet static pressure). In order to get the open water test performance coefficients for the considered propeller (KT, KQ, η), different advance coefficient (J) are imposed as boundary conditions for the numerical model. The results of such simulations are compared with experimental data available for the open water tests of the propeller. Once the model is validated with the experimental data available, a wake field simulation would be possible and would lead to the definition of the fluid-dynamic variables (pressure, iso-velocity maps, etc.) which are needed during any design process. Also some comparisons with real scale thrust measurements are intended.

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