The electronic shell structure of triangular, hexagonal and round graphene quantum dots (flakes) near the Fermi level has been studied using a tight-binding method. The results show that close to the Fermi level the shell structure of a triangular flake is that of free massless particles, and that triangles with an armchair edge show an additional sequence of levels (“ghost states”). These leve...

Asymptotically exact and nonlocal third order nonlinear evolution equations are derivedfor two counterpropagating surface capillary gravity wave packets in deep water in thepresence of wind flowing over water.From these evolution equations stability analysis ismade for a uniform standing surface capillary gravity wave trains for longitudinal perturbation. Instability condition is obtained and g...

[1] The Mellor‐Yamada turbulence closure scheme, used in many ocean circulation models, is often blamed for overly high simulated surface temperature and overly low simulated subsurface temperature in summer due to insufficient vertical mixing. Surface waves can enhance turbulence kinetic energy and mixing of the upper ocean via wave breaking and nonbreaking‐wave‐turbulence interaction. The inf...

recently a new structure called groove gap waveguide (GGW) is ‎introduced to implement low loss microwave component devices ‎especially for millimeter wave applications. This paper presents a ‎new type of H-plane horn antenna making use of this new technology ‎in which backward radiation is significantly suppressed by ‎introducing a high impedance surface at the antenna aperture. The ‎high impe...

Abstract Knowledge of Martian crust and uppermost mantle aid us studying the planet's evolution. NASA's InSight mission provides seismic data being used to reveal interior structure. Most studies have focused on crustal structure beneath lander, but other regions has remained poorly known. We use surface‐wave investigate a large region along Medusa Fossae Formation dichotomy. adopt largest‐magn...

The soft-and-hard surface (SHS) is employed to suppress the surface wave generated by a patch antenna integrated with high dielectric-constant LTCC multilayer packages. Two antenna structures are investigated to demonstrate the potential capability of the SHS in surface-wave suppression. The first is a stacked patch antenna on a large-size substrate. It is shown that using SHS can increase the ...

We analyze a model problem representing multielectronic molecule sitting on metal surface. Working with reduced configuration interaction Hamiltonian, we show that one can extract very accurate ground state wave functions as compared numerical renormalization group theory (NRG)—even in the limit of weak metal-molecule coupling strength but strong intramolecular electron–electron repulsion. More...

We study a model for anisotropic singlet pairing in A3C60, using a realistic model for the Fermi surface in a hypothesized orientationally-ordered doped crystal. Anisotropic solutions are studied by combining numerical solutions to the gap equation in the low-temperature phase with a Landau expansion near the mean field critical temperature. We focus on a class of three-dimensional nodeless d-w...

We study the structure of two-body s-wave bound states as well as resonances in the threshold energy region. We focus on the single-channel scattering where the scattering length and the effective range are given by real numbers. It is shown that, in the energy region where the effective range expansion is valid, the properties of resonances are constrained only by the position of the pole. We ...