scholarly journals The Accretion-Powered Jet Propagations and Breakout Criteria for GRB Progenitors

2011 ◽  
Vol 7 (S279) ◽  
pp. 363-364
Author(s):  
Hiroki Nagakura ◽  
Yudai Suwa ◽  
Kunihito Ioka
Keyword(s):  
Conversion Efficiency ◽  
Mass Flux ◽  
Accretion Rate ◽  
Opening Angle ◽  
Relativistic Hydrodynamics ◽  
Simple Condition ◽  
Two Dimensional

AbstractWe investigate the propagation of accretion-powered jets in various types of progenitor candidates of GRBs. We perform two dimensional axisymmetric simulations of relativistic hydrodynamics taking into account both the envelope collapse and the jet propagation. In our simulations, the accretion rate is estimated by the mass flux going through the inner boundary, and the jet is injected with a constant accretion-to-jet conversion efficiency η. By varying the efficiency η and opening angle θop for more than 30 models, we find that the jet can make a relativistic breakout from all types of progenitors for GRBs if a simple condition η ≳ 10−3 (θop/20°)2 is satisfied, that is consistent with analytical estimates, otherwise no explosion or some failed spherical explosions occur.

scholarly journals Two-dimensional or passivation treatment: the effect of Hexylammonium post deposition treatment on 3D halide perovskite-based solar cells

2021 ◽  
Author(s):  
Stav Rahmany ◽  
Lioz Etgar
Keyword(s):  
Solar Cells ◽  
Power Conversion Efficiency ◽  
Conversion Efficiency ◽  
Power Conversion ◽  
Perovskite Solar Cells ◽  
Two Dimensional ◽  
Theoretical Limit ◽  
Halide Perovskite ◽  
Passivation Treatment ◽  
Post Deposition

Much effort has been made to push the power conversion efficiency of perovskite solar cells (PSCs) towards the theoretical limit. Recent studies have shown that post deposition treatment of barrier...

scholarly journals Dynamics with Cattaneo–Christov heat and mass flux theory of bioconvection Oldroyd-B nanofluid

2020 ◽  
Vol 12 (8) ◽  
pp. 168781402093046 ◽  
Author(s):  
Noor Saeed Khan ◽  
Qayyum Shah ◽  
Arif Sohail
Keyword(s):  
Mass Transfer ◽  
Porous Media ◽  
Differential Equations ◽  
Mass Flux ◽  
Homotopy Analysis Method ◽  
Two Dimensional ◽  
Analysis Method ◽  
Homotopy Analysis ◽  
Transfer Flow ◽  
Insight Into

Entropy generation in bioconvection two-dimensional steady incompressible non-Newtonian Oldroyd-B nanofluid with Cattaneo–Christov heat and mass flux theory is investigated. The Darcy–Forchheimer law is used to study heat and mass transfer flow and microorganisms motion in porous media. Using appropriate similarity variables, the partial differential equations are transformed into ordinary differential equations which are then solved by homotopy analysis method. For an insight into the problem, the effects of various parameters on different profiles are shown in different graphs.

scholarly journals Strongly enhanced four wave mixing in micro-ring resonators integrated with 2D graphene oxide films

2020 ◽  
Author(s):  
David Moss
Keyword(s):  
Graphene Oxide ◽  
Conversion Efficiency ◽  
Oxide Films ◽  
Four Wave Mixing ◽  
Ring Resonators ◽  
Wave Mixing ◽  
Two Dimensional

<a>Two-dimensional </a>layered graphene oxide films are integrated with micro-ring resonators to experimentally demonstrate enhanced four-wave mixing, achieving up to ~7.6-dB enhancement in conversion efficiency for a uniformly coated device and ~10.3-dB for a patterned device.

A review on two-dimensional (2D) perovskite material-based solar cells to enhance the power conversion efficiency

2022 ◽  
Author(s):  
Ehsan Elahi ◽  
Ghulam Dastgeer ◽  
Abdul Subhan Siddiqui ◽  
Supriya A. Patil ◽  
Muhammad Waqas Iqbal ◽  
...  
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Power Conversion Efficiency ◽  
Conversion Efficiency ◽  
Power Conversion ◽  
Two Dimensional ◽  
Rapid Progress ◽  
Perovskite Materials ◽  
Perovskite Material

With perovskite materials, rapid progress in power conversion efficiency (PCE) to reach 25% has gained a significant amount of attention from the solar cell industry.

Modeling an Explosive Liquid Outflow from High Pressure Thin Tubes and Nozzles

2016 ◽  
Vol 851 ◽  
pp. 377-382
Author(s):  
Raisa Bolotnova ◽  
Andrey Topolnikov ◽  
Valeria Korobchinskaya
Keyword(s):  
Liquid Mixture ◽  
Saturation Temperature ◽  
Cylindrical Tube ◽  
Opening Angle ◽  
Radial Expansion ◽  
Two Dimensional ◽  
Initial State ◽  
Parabolic Form ◽  
Conical Form

To describe the explosive flow in thin tubes the model of vapor-liquid mixture with heat and mass transfer in two-dimensional axisymmetric formulation is employed. The phase transformation is significantly amplified with increasing of initial saturation temperature. The radial expansion of the jet outflow occurs due to the intensification of vaporization from cylindrical to conical form and parabolic form for supercritical initial state. Another problem applied to the outflow of a detonation wave in liquid filled with chemically active gas bubbles from the thin cylindrical tube. Modeling shows the important role of the opening angle of the outflow jet, which can either support the detonation or put it down.

scholarly journals Topological Catastrophe in Massive Current Sheets

1989 ◽  
Vol 104 (2) ◽  
pp. 285-288
Author(s):  
Ph. Peterle ◽  
J. Hoyvaerts
Keyword(s):  
Boundary Conditions ◽  
Mass Flux ◽  
Flux Ratio ◽  
Continuous Variation ◽  
Two Dimensional ◽  
Cusp Point ◽  
Fixed Boundary ◽  
Current Sheets ◽  
Solar Filaments

AbstractA two-dimensional sheet model for solar filaments (Kippenhahn and Schluter configuration) is considered. We investigate, the quasi-static evolution of gravito-magnetohydrostatic equlibria in exploring the response of massive current sheets to a slow continuous variation of the mass/flux ratio with fixed boundary conditions. A catastrophic behavior of the field topology is found to occur in the sequence following the formation of a cusp point (bifurcation).

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