Rapid Cooling

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Daniel F Stockli - One of the best experts on this subject based on the ideXlab platform.

  • the evolution of eastern sichuan basin yangtze block since cretaceous constraints from low temperature thermochronology
    Journal of Asian Earth Sciences, 2016
    Co-Authors: Hongcai Shi, Xiaobin Shi, Ulrich A Glasmacher, Xiaoqiu Yang, Daniel F Stockli
    Abstract:

    Abstract In Yangtze block (South China), there is a well-developed Mesozoic thrust system extended through the Xuefeng and Wuling mountains in the southeast to the Sichuan basin in the northwest. We present 11 apatite fission-track (AFT) data and 11 (U–Th–Sm)/He ages to unravel the low temperature thermal history of a part of the system located in the eastern Sichuan basin. The fission-track data are interpreted using a grain-age deconvolution algorithm with inverse thermal modeling of track length, grain ages and mineral composition proxy data. Results suggest that apatite fission-track ages range between 99.3 ± 8.1 and 51.0 ± 4.0 Ma, and the apatite (U–Th–Sm)/He ages between 58.3 ± 3.5 Ma and 14.2 ± 0.9. The spatial distribution of these ages shows a trend decreased from SE to NW gradually, which supports the idea of a prolonged, steady-state rock uplift and erosion process across the eastern Sichuan basin. Thermal history modeling of the combined FT and (U–Th–Sm)/He datasets reveal a common three stage Cooling history: (1) initial stage of Rapid Cooling that younger to the east during pre-Cretaceous, (2) following by a period of relative (but not perfect) thermal stability at ∼65–50 °C, (3) and then a new Rapid Cooling stage that initiated in all samples between ∼15 and 20 Ma. The first Rapid Cooling at a rate of ⩾1.5 °C/Ma is associated with coeval tectonism in nearby regions, which result in folds and faults of the eastern Sichuan basin. Early-mid Cenozoic thermal stability is contributed to the extension widely occurring in the eastern China continent at which the average Cooling rate decreased to ∼0.16 °C/Ma. Causes for speculative accelerated Cooling after ca. 20–15 Ma with a rate of ⩾1.2 °C/Ma may be a far-field effect of upward and eastward growth of the Tibetan Plateau but could also be related to climate effects. In a whole, this paper analyzes the several Mesozoic and Cenozoic tectonic events influence to the patters of regional denudation.

  • Rapid Cooling rates at an active mid ocean ridge from zircon thermochronology
    Earth and Planetary Science Letters, 2011
    Co-Authors: Axel K. Schmitt, Daniel F Stockli, M R Perfit, K H Rubin, Matthew Smith, Laurie A Cotsonika, Georg F Zellmer, Ian W Ridley, Oscar M Lovera
    Abstract:

    article i nfo Oceanic spreading ridges are Earth's most productive crust generating environment, but mechanisms and rates of crustal accretion and heat loss are debated. Existing observations on Cooling rates are ambiguous regarding the prevalence of conductive vs. convective Cooling of lower oceanic crust. Here, we report the discovery and dating of zircon in mid-ocean ridge dacite lavas that constrain magmatic differentiation and Cooling rates at an active spreading center. Dacitic lavas erupted on the southern Cleft segment of the Juan de Fuca ridge, an intermediate-rate spreading center, near the intersection with the Blanco transform fault. Their U-Th zircon crystallization ages (29.3�4.6 +4.8 ka; 1σ standard error s.e.) overlap with the (U-Th)/He zircon eruption age (32.7±1.6 ka) within uncertainty. Based on similar 238

Hidetoshi Fujii - One of the best experts on this subject based on the ideXlab platform.

  • investigation of temperature dependent microstructure evolution of pure iron during friction stir welding using liquid co2 Rapid Cooling
    Materials Characterization, 2018
    Co-Authors: X. C. Liu, Yufeng Sun, Tomoya Nagira, Hidetoshi Fujii
    Abstract:

    Abstract The microstructure evolution of pure iron during friction stir welding was reconstructed by an ingenious experimental design, in which the Rapid Cooling friction stir welding combined with the tool “stop action” technique and the subsequent short-time annealing were adopted to “freeze” the transient microstructure during the stirring and reproduce the normal Cooling during conventional friction stir welding, respectively. The microstructure evolution during the stirring and normal Cooling was investigated along the material flow path and in the annealed “frozen” weld zone by high-resolution electron-backscatter-diffraction technique. The results show that the continuous and discontinuous dynamic recrystallizations occur simultaneously at the severe deformation stage in front of the tool both under low and high heat input conditions. However, during the material flow, the microstructure evolution involves the plastic deformation, recrystallization, high angle boundaries migration and dynamic recovery under the low heat input condition, while in a dynamic balance of deformation, recrystallization and grain growth under the high heat input conditions. At the Cooling stage, normal grain growth occurs both for the low and high heat input welding conditions, while it is very limited for the low heat input condition.

  • enhanced mechanical properties of 70 30 brass joint by Rapid Cooling friction stir welding
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2014
    Co-Authors: Rintaro Ueji, Hidetoshi Fujii
    Abstract:

    Abstract The effect of Rapid Cooling on the microstructure, texture and mechanical properties of friction stir welded 70/30 brass was investigated. Liquid CO 2 was used as the Cooling medium during the process. Without the Rapid Cooling, the welded joint showed many micropores and Zn/Cu oxides in the stir zone accompanied by a relatively wide heat-affected zone. The stir zone showed relatively coarse grains with a mean diameter of 9.7 μm and these grains had low dislocation density. The crystallographic texture whose dominant component of {1 0 0} (// shear plane) 〈0 0 1〉(// shear direction) was also found. On the other hand, when the Rapid Cooling was carried out during the welding process, a sound joint with no obvious heat-affected zone was achieved. The stir zone showed the fine-grained structure whose mean grain size is 1.2 μm with high dislocation density. The texture in the stir zone was completely different from that in the joint without the Rapid Cooling. These differences between the joints with and without the Rapid Cooling indicate the significant post-annealing effect, including both recovery and static recrystallization can be prohibited by the Rapid Cooling. As a result, enhanced yield strength with adequate ductility of the stir zone was obtained.

Thomas J. Meyer - One of the best experts on this subject based on the ideXlab platform.

  • Bose-Einstein condensation of quasiparticles by Rapid Cooling.
    Nature nanotechnology, 2020
    Co-Authors: Michael Schneider, Thomas Brächer, David Breitbach, Viktor Lauer, Philipp Pirro, Dmytro A. Bozhko, Halyna Yu. Musiienko-shmarova, Björn Heinz, Qi Wang, Thomas J. Meyer
    Abstract:

    The fundamental phenomenon of Bose-Einstein condensation has been observed in different systems of real particles and quasiparticles. The condensation of real particles is achieved through a major reduction in temperature, while for quasiparticles, a mechanism of external injection of bosons by irradiation is required. Here, we present a new and universal approach to enable Bose-Einstein condensation of quasiparticles and to corroborate it experimentally by using magnons as the Bose-particle model system. The critical point to this approach is the introduction of a disequilibrium of magnons with the phonon bath. After heating to an elevated temperature, a sudden decrease in the temperature of the phonons, which is approximately instant on the time scales of the magnon system, results in a large excess of incoherent magnons. The consequent spectral redistribution of these magnons triggers the Bose-Einstein condensation.

Jiřı́ Štětina - One of the best experts on this subject based on the ideXlab platform.

  • Influence of cheese ripening and rate of Cooling of the processed cheese mixture on rheological properties of processed cheese
    Journal of Food Engineering, 2004
    Co-Authors: I. Piska, Jiřı́ Štětina
    Abstract:

    Abstract The objective of this work was to study the influence of the natural cheese maturity and Cooling rate of the processed cheese mixture after packaging on texture and rheological properties of the high-fat processed cheese. Increasing the content of the mature cheese raw material decreased the complex modulus, yield stress and hardness of the processed cheese, but not the taste of the processed cheese. The Rapid Cooling of the molten mix decreased the complex modulus and improved the spreadability, but also increased the stickiness. Differences in ripening index of the cheese blend or the Cooling rate did not affect viscoelastic behaviour of the processed cheeses. Linear viscoelasticity region was in the range 0–200 Pa. Influence of the Rapid Cooling on the texture and rheological properties was more significant than influence of maturity of the raw material.

Dimieri L. - One of the best experts on this subject based on the ideXlab platform.

  • Apatite (U-Th)/He thermochronology and Re-Os ages in the Altar region, Central Andes (31°30’S), Main Cordillera of San Juan, Argentina : implications of Rapid exhumation in the porphyry Cu (Au) metal endowment and regional tectonics.
    'Springer Science and Business Media LLC', 2020
    Co-Authors: Maydagan L., Zattin M., Mpodozis C., Selby D., Franchini M., Dimieri L.
    Abstract:

    Altar is a large porphyry Cu (Au) deposit located in the Main Cordillera of Argentina, 20 km to the north of the giant Los Pelambres–El Pachón porphyry copper cluster, at the southern portion of the Pampean flat-slab segment of the Andes. Although this region hosts telescoped porphyry-epithermal deposits, the precise temporal relationship between porphyry emplacement, mineralization, Cooling, and regional orogenic uplift are still poorly understood. New Re–Os molybdenite ages indicate that Altar orebodies are associated with two magmatic hydrothermal centers: Altar East (11.16 ± 0.06 Ma) and Altar Central (10.38 ± 0.05 Ma) formed at temporally distinct periods. New (U–Th)/He ages from the Early Permian and Late Eocene plutons, and the Middle Miocene subvolcanic stocks associated with Cu–Au mineralization of the Altar region reflect a Rapid Cooling pulse during the Middle Miocene (15.02 to 10.66 Ma) coeval with a major phase of tectonic shortening and regional uplift. The main pulse of Rapid Cooling and related tectonic uplift in the Altar region was synchronous with the formation of the hydrothermal systems and resulted in an increased focused metal endowment (Au–Cu grades) due to the telescoping of epithermal mineralization over the Rapidly uplifted porphyry system. This 11–10 Ma tectonically triggered exhumation event coincides with the collision of the E-trending segment of the Juan Fernández Ridge with the Peru–Chile trench, at this latitude. Collision and ensuing ridge subduction may have driven a localized pulse of Rapid Cooling and exhumation of the Main Cordillera that has not been well documented to the north or south of the Altar–Los Pelambres region

  • Apatite (U–Th)/He thermochronology and Re–Os ages in the Altar region, Central Andes (31°30′S), Main Cordillera of San Juan, Argentina: implications of Rapid exhumation in the porphyry Cu (Au) metal endowment and regional tectonics
    'Springer Science and Business Media LLC', 2020
    Co-Authors: Maydagan L., Zattin M., Mpodozis C., Selby D., Franchini M., Dimieri L.
    Abstract:

    Altar is a large porphyry Cu (Au) deposit located in the Main Cordillera of Argentina, 20\ua0km to the north of the giant Los Pelambres\u2013El Pach\uf3n porphyry copper cluster, at the southern portion of the Pampean flat-slab segment of the Andes. Although this region hosts telescoped porphyry-epithermal deposits, the precise temporal relationship between porphyry emplacement, mineralization, Cooling, and regional orogenic uplift are still poorly understood. New Re\u2013Os molybdenite ages indicate that Altar orebodies are associated with two magmatic hydrothermal centers: Altar East (11.16 \ub1 0.06\ua0Ma) and Altar Central (10.38 \ub1 0.05\ua0Ma) formed at temporally distinct periods. New (U\u2013Th)/He ages from the Early Permian and Late Eocene plutons, and the Middle Miocene subvolcanic stocks associated with Cu\u2013Au mineralization of the Altar region reflect a Rapid Cooling pulse during the Middle Miocene (15.02 to 10.66\ua0Ma) coeval with a major phase of tectonic shortening and regional uplift. The main pulse of Rapid Cooling and related tectonic uplift in the Altar region was synchronous with the formation of the hydrothermal systems and resulted in an increased focused metal endowment (Au\u2013Cu grades) due to the telescoping of epithermal mineralization over the Rapidly uplifted porphyry system. This 11\u201310\ua0Ma tectonically triggered exhumation event coincides with the collision of the E-trending segment of the Juan Fern\ue1ndez Ridge with the Peru\u2013Chile trench, at this latitude. Collision and ensuing ridge subduction may have driven a localized pulse of Rapid Cooling and exhumation of the Main Cordillera that has not been well documented to the north or south of the Altar\u2013Los Pelambres region