National Bureau of Economic Research (NBER)
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... in Nigeria, B.E.A. modify drill for overshooting, £1,000m. will be spent on hospitals, New ...
1966 - Gale Group | TDA
Yan Li, Xinghao Chen, Heran Xiong, J. Guo, Xuefei Chen, Zhanwen Han,
... in core helium-burning stars. To explore the overshooting mixing beyond the convective core, we incorporated the ... Experiments in Stellar Astrophysics (MESA), and investigated the overshooting mixing in evolution of subdwarf B (sdB) models. ... nabla }}}_{\mathrm{rad}}$?> ∇ rad , monotonically decreases outwardly, the overshooting mixing presents exponential decay similar with Herwig, and the overshooting distance is to make <?CDATA ${{\rm{\nabla }}}_{\mathrm{ ... ad}}$?> ∇ ad . For the single-zone case, the overshooting mixing shows exponential decay, but the overshooting distance ...
Tópico(s): Gamma-ray bursts and supernovae
2018 - IOP Publishing | The Astrophysical Journal
National Bureau of Economic Research (NBER)
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... Try To Stop Race Film, Inquest told of overshooting measures by B.E.A., Chinese drag French ...
1967 - Gale Group | TDA
Helioseimic investigation shows that convective overshooting can penetrate 0.37HP to the location where the temperature is 2.5 × 106 K, which is the typical temperature of ... reaction Li7(p, α)He4. This indicates that overshooting mixing should be involved in investigating the solar ... show that the Sun is not very peculiar. Overshooting mixing should also be involved in investigating Li abundance in clusters. However, fully overshooting mixing with a length of 0.37HP results ... Therefore, using the diffusive process to describe the overshooting is more suitable. The diffusive overshooting approach requires ...
Tópico(s): Solar and Space Plasma Dynamics
2012 - Oxford University Press | Monthly Notices of the Royal Astronomical Society
National Bureau of Economic Research (NBER)
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... caught off guard by EC initiative Irish concern overshooting Games appeal 1960 worries Jumbo puzzle Soviet confusion ...
1991 - Gale Group | TDA
... dominated by various physical effects, including mass loss, overshooting, and rotation, but the prescriptions of their effects ... MESA stellar evolution models, adopting calibrated prescriptions of overshooting, mass loss, and rotation. Methods . We introduce a ... binary system with an enhanced amount of core overshooting ( α ov = 0.5), mass loss, and rotational ... us to conclude that the amount of core overshooting is larger than is normally adopted in contemporary ... sequence due to an increased demand for core overshooting. The increased amount of core overshooting is not ...
Tópico(s): Astrophysics and Star Formation Studies
2019 - EDP Sciences | Astronomy and Astrophysics
National Bureau of Economic Research (NBER)
Mikael Grut, Bulent Levi, B. Crabtree, Don Simpson, Lord Cunliffe, Thomas Quinn, D. Aravantinos, Esmond Birnie, Dominique Mars, Peter Kaskell, Richard Lorch, Teresa Gorman, Graham Evans, Richard Minke, Paul Zamodits, Antoine Comiti, A.M. Christodoulou, Robin Buller, John Wells, Francis Peel,
... Week Back to earth BTR Japanese spoken here Overshooting Public spending Island-hoppers Holiday Inn Investelectric Arthur ...
1991 - Gale Group | The Economist
... dominated by various physical effects, including mass loss, overshooting, and rotation, but the prescriptions of their effects ... MESA stellar evolution models, adopting calibrated prescriptions of overshooting, mass loss, and rotation.Methods . We introduce a ... binary system with an enhanced amount of core overshooting (α ov = 0.5), mass loss, and rotational ... us to conclude that the amount of core overshooting is larger than is normally adopted in contemporary ... sequence due to an increased demand for core overshooting. The increased amount of core overshooting is not ...
Tópico(s): Astrophysics and Star Formation Studies
2019 - EDP Sciences | Astronomy and Astrophysics
National Bureau of Economic Research (NBER)
The overshooting in the framework of the turbulent convection model is investigated in the solar overshooting region. The overshooting mixing is treated as a diffusive process. It ... solar convective envelope is almost eliminated by the overshooting mixing. The overshooting mixing leads to a significant depletion of Li ... initial abundance in the solar models with the overshooting mixing. The solar model with the overshooting shows a smooth profile of the temperature gradient, ...
Tópico(s): Astro and Planetary Science
2012 - IOP Publishing | The Astrophysical Journal
National Bureau of Economic Research (NBER)
... the initial excitations. The typical analysis technique for overshooting involves the study of asymptotic response of the ... This article finds that the prior analysis of overshooting in much of the engineering literature is incomplete ... physical damping. With physical damping included, first‐order overshooting components enter into several well‐known time integration ... which were previously thought to exhibit zero‐order overshooting in displacement. The Newmark method, Wilson‐ method, Bazzi‐ ... based upon the issues under consideration. The additional overshooting component is eliminated in the novel amended GSSSS ...
Tópico(s): Vibration and Dynamic Analysis
2022 - Wiley | International Journal for Numerical Methods in Engineering
National Bureau of Economic Research (NBER)
J. Higl, Ewald Müller, A. Weiß,
... of the biggest uncertainties in stellar evolution. 1D overshooting descriptions introduce a free parameter ($f_{ov}$) that ... be used to study the size of the overshooting region and the involved mixing processes. Here we show how one can calibrate an overshooting parameter by performing 2D Maestro simulations of Zero- ... resulting entrainment can be interpreted in terms of overshooting parameters. We find that increasing the overshooting parameter $f_{ov}$ beyond a certain value in ... can be used to put limits on the overshooting parameter. We find $0.010 < f_{ov} < 0. ...
Tópico(s): Astronomy and Astrophysical Research
2020 - EDP Sciences | Astronomy and Astrophysics
National Bureau of Economic Research (NBER)
Guglielmo Costa, L. Girardi, A. Bressan, Paola Marigo, Thaíse S. Rodrigues, Yang Chen, A. Lanza, Paul Goudfrooij,
... PARSEC tracks that account for both convective core overshooting and rotational mixing. Using overshooting alone we obtain that, for masses larger than ... 1.9 M$_{\odot}$, the distribution of the overshooting parameter, $\lambda_\mathrm{ov}$, has a wide dispersion ... While the lower limit supports a mild convective overshooting efficiency, the large dispersion derived is difficult to ... velocities, in addition to a fixed amount of overshooting, could reproduce the high dispersion derived for intermediate- ... find good agreement with models computed with fixed overshooting parameter, $\lambda_\mathrm{ov}=0.4$, and initial ...
Tópico(s): Astro and Planetary Science
2019 - Oxford University Press | Monthly Notices of the Royal Astronomical Society
... have been used to calibrate models of convective overshooting in the cores of main sequence stars. In ... test how precisely this method can constrain the overshooting and whether the data support a universal stellar mass--overshooting relation. We do not recover the previously reported stellar mass dependence for the extent of overshooting and in each case we find there is ... be matched by models with different amounts of overshooting. Models with a moderate overshooting parameter $0.013 \leq f_\text{os} \leq ...
Tópico(s): Astronomy and Astrophysical Research
2018 - EDP Sciences | Astronomy and Astrophysics
Wenjun Sang, Qian Huang, Wenshou Tian, Jonathon S. Wright, Jiankai Zhang, Hongying Tian, Jiali Luo, Dingzhu Hu, Yuanyuan Han,
... resolving large eddy model (LEM), we investigate how overshooting convection affects the water vapor content in the ... water vapor into the lower stratosphere associated with overshooting convection. The three‐dimensional LEM simulations capture the ... model results indicate that the net effect of overshooting convection on lower stratospheric water content is moistening, ... turbulent mixing to water vapor transport from the overshooting turret into the stratosphere are relatively weak. Sensitivity ... velocity) is directly related to the effect of overshooting convection on lower stratospheric humidity. This impact is ...
Tópico(s): Climate variability and models
2018 - Wiley | Journal of Geophysical Research Atmospheres
John W. Cooney, Kenneth P. Bowman, Cameron R. Homeyer, Tyler M. Fenske,
Abstract Convection that penetrates the tropopause (overshooting convection) rapidly transports air from the lower troposphere to the lower stratosphere, potentially mixing air between the two layers. This exchange of ... this study presents a 10 year analysis of overshooting convection for the eastern two thirds of the ... Atmospheric Administration Next Generation Weather Radar (NEXRAD) network. Overshooting convection is identified by comparing echo top altitudes ... the ERA‐Interim reanalysis. It is found that overshooting convection is most common in the central United ...
Tópico(s): Atmospheric chemistry and aerosols
2018 - Wiley | Journal of Geophysical Research Atmospheres
S. Iwasaki, Takashi Shibata, Hajime Okamoto, Hiroshi Ishimoto, Hisayuki Kubota,
Synergetic spaceborne observations of overshooting air, defined as cloud intrusion through the level of neutral buoyancy above deep convection, are analyzed using various thresholds introduced in previous studies to detect overshooting. The brightness temperature of the overshooting air measured by the Moderate Resolution Imaging Spectroradiometer ( ... Range Weather Forecast (ECMWF). The lapse rate of overshooting whose cloud top is higher than the level ... can be rationalized as being due to the overshooting air being locally warmed by a mixture of ...
Tópico(s): Atmospheric chemistry and aerosols
2012 - American Geophysical Union | Journal of Geophysical Research Atmospheres
Petra Mikuš, Nataša Strelec Mahović,
... the possibilities of satellite-based automatic detection of overshooting convective cloud tops and the connection between the overshootings and the occurrence of severe weather on the ... 7–10.8 μm, which are correlated to overshootings in HRV images in 80% of the cases. ... focused on determining whether the appearance of the overshooting top, a manifestation of a very strong updraft ... certain weather elements on the ground. For all overshooting tops found by the above-mentioned combined method, ... 2° were analyzed. The results show that the overshootings are connected to precipitation in 80% and to ...
Tópico(s): Wind and Air Flow Studies
2012 - Elsevier BV | Atmospheric Research
... be good tools to deal with the convective overshooting in the stellar interior. However, they are too ... to understand the physical processes of the convective overshooting and to simplify the application of turbulent convection ... solution of the turbulent convection model in the overshooting region, and find some important properties of the convective overshooting: I. The overshooting region can be partitioned into three parts: a ... value of the anisotropic degree $\omega$. II. The overshooting length of the turbulent heat flux $\bar{u_{ ...
Tópico(s): Solar and Space Plasma Dynamics
2012 - IOP Publishing | The Astrophysical Journal
D. Temaj, F. R. N. Schneider, E. Laplace, Dandan Wei, Philipp Podsiadlowski,
... of 5 − 70 M ⊙ and convective core step-overshooting of 0.05 − 0.50 pressure scale heights. ... at M CO ≳ 14 M ⊙ . Larger convective core overshooting will shift the location of the compactness peak ... in models with the lowest (highest) convective core overshooting parameter. In both high-compactness regimes, stars are ... models, with the lowest and highest convective core overshooting parameter, respectively. The compactness parameter, central specific entropy, ... and nickel mass production with the convective core overshooting value, but we do see a tight relation ...
Tópico(s): Astrophysics and Star Formation Studies
2023 - EDP Sciences | Astronomy and Astrophysics
I. Baraffe, Joseph J. Clarke, Adrien Morison, D. G. Vlaykov, T. Constantino, T. Goffrey, Thomas Guillet, Arthur Le Saux, J. Pratt,
... implicit code MUSIC. We study the efficiency of overshooting, which describes the ballistic process of convective flows ... events previously developed for convective envelopes, we derive overshooting lengths as a function of stellar masses. We find that the overshooting distance ($d_{\rm ov}$) scales with the stellar ... to observations. The scaling predicts values for the overshooting distance that significantly increase with stellar mass, in ... nearly-adiabatic layer gets closer to the maximum overshooting length and as the simulation time exceeds the ...
Tópico(s): Astrophysical Phenomena and Observations
2023 - Oxford University Press | Monthly Notices of the Royal Astronomical Society
Cameron R. Homeyer, Kenneth P. Bowman,
... well. It is found that tropopause depression (TD) overshooting and LRT overshooting occur at similar frequency over the United States, with TD overshooting being more episodic in nature than LRT overshooting. TD overshooting is also found more often throughout the cooler months of the year, while LRT overshooting dominates all overshooting in the summer months. Stratospheric residence of overshoot ...
Tópico(s): Atmospheric chemistry and aerosols
2021 - Wiley | Journal of Geophysical Research Atmospheres
Nana Liu, Chuntao Liu, Lindsey Hayden,
... to quantify the frequency and global distribution of overshooting convection. In this study, overshooting convection is defined as PFs with maximum 20 ... ERA‐Interim reanalysis data. The geographical distribution of overshooting convection exhibits a strong preference for specific land ... tropics. Furthermore, a methodology is developed to detect overshooting convection using the GPM Microwave Imager measured brightness ... Temperature at 89 GHz. The geographical distribution of overshooting convection can be closely reproduced using the combinations ...
Tópico(s): Meteorological Phenomena and Simulations
2020 - Wiley | Journal of Geophysical Research Atmospheres