110,679 research outputs found
Optimization of Dimples in Microchannel Heat Sink with Impinging Jets—Part B: the Influences of Dimple Height and Arrangement
The combination of a microchannel heat sink with impinging jets and dimples (MHSIJD) can effectively improve the flow and heat transfer performance on the cooling surface of electronic devices with very high heat fluxes. Based on the previous work by analysing the effect of dimple radius on the overall performance of MHSIJD, the effects of dimple height and arrangement were numerically analysed. The velocity distribution, pressure drop, and thermal performance of MHSIJD under various dimple heights and arrangements were presented. The results showed that: MHSIJD with higher dimples had better overall performance with dimple radius being fixed; creating a mismatch between the impinging hole and dimple can solve the issue caused by the drift phenomenon; the mismatch between the impinging hole and dimple did not exhibit better overall performance than a well-matched design
Competitive Outcomes and Endogenous Coalition Formation in an n-Person Game
In this paper we study competitive outcomes and endogenous coalition formation in a cooperative n-person transferable utility (TU) game from the viewpoint of general equilibrium theory.For any given game, we construct a competitive exchange coalition production economy corresponding to the game. First, it is shown that the full core of a TU game is not empty if and only if the completion of the game is balanced.The full core is defined free of any particular coalition structure and the coalitions of the game emerge endogenously from the full core.Second, it is shown that the full core of a completionbalanced general TU game coincides with the set of equilibrium payoff vectors of its corresponding economy and that the coalition structures of the game are endogenously determined by the equilibrium outcomes of the economy.As a consequence, the core of a balanced general TU game coincides with the set of equilibrium payoff vectors of its corresponding economy.game theory;cooperative games;general equilibrium
Cascade of Quantum Phase Transitions in Tunnel-Coupled Edge States
We report on the cascade of quantum phase transitions exhibited by
tunnel-coupled edge states across a quantum Hall line junction. We identify a
series of quantum critical points between successive strong and weak tunneling
regimes in the zero-bias conductance. Scaling analysis shows that the
conductance near the critical magnetic fields is a function of a single
scaling argument , where the exponent .
This puzzling resemblance to a quantum Hall-insulator transition points to
importance of interedge correlation between the coupled edge states.Comment: 4 pages, 3 figure
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Unraveling the Cationic and Anionic Redox Reactions in a Conventional Layered Oxide Cathode
Increasing interest in high-energy lithium-ion batteries has triggered the demand to clarify the reaction mechanism in battery cathodes during high-potential operation. However, the reaction mechanism often involves both transition-metal and oxygen activities that remain elusive. Here we report a comprehensive study of both cationic and anionic redox mechanisms of LiNiO2 nearly full delithiation. Selection of pure LiNiO2 removes the complication of multiple transition metals. Using combined X-ray absorption spectroscopy, resonant inelastic X-ray scattering, and operando differential electrochemical mass spectrometry, we are able to clarify the redox reactions of transition metals in the bulk and at the surface, reversible lattice oxygen redox, and irreversible oxygen release associated with surface reactions. Many findings presented here bring attention to different types of oxygen activities and metal-oxygen interactions in layered oxides, which are of crucial importance to the advancement of a Ni-rich layered oxide cathode for high capacity and long cycling performance
Dynamics of moving bubbles in single and binary component systems
Dynamics of a single bubble moving in a quiescent liquid is analyzed for single and binary component systems. The transport of energy and/or mass at thermodynamic-phase equilibrium governs the dynamics of the bubble at its interface
Evidence for a Fractional Quantum Hall Nematic State in Parallel Magnetic Fields
We report magneto-transport measurements for the fractional quantum Hall
state at filling factor 5/2 as a function of applied parallel magnetic
field (). As is increased, the 5/2 state becomes increasingly
anisotropic, with the in-plane resistance along the direction of
becoming more than 30 times larger than in the perpendicular direction.
Remarkably, the resistance anisotropy ratio remains constant over a relatively
large temperature range, yielding an energy gap which is the same for both
directions. Our data are qualitatively consistent with a fractional quantum
Hall \textit{nematic} phase
Thermal rectifier from deformed carbon nanohorns
We study thermal rectification in single-walled carbon nanohorns (SWNHs) by
using non-equilibrium molecular dynamics (MD) method. It is found that the
horns with the bigger top angles show larger asymmetric heat transport due to
the larger structural gradient distribution. This kind of gradient behavior can
be further adjusted by applying external strain on the SWNHs. After being
carefully elongated along the axial direction, the thermal rectification in the
elongated SWNHs can become more obvious than that in undeformed ones. The
maximum rectification efficiency of SWNHs is much bigger than that of carbon
nanotube intramolecular junctions.Comment: 3 figure
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