The newly developed unifying discontinuous formulation named the correction procedure via reconstruction (CPR) for conservation laws is extended to solve Navier-Stokes equations 3D mixed grids. In current development, tetrahedrons and triangular prisms are considered. CPR method can unify several popular high order methods including Galerkin spectral volume into a more efficient differential form. By selecting solution points coincide with flux points, be completely avoided. Accuracy studies...

We studied the cluster size distribution of dislocation-free InAs/GaAs self-assembled quantum dots obtained by Stranski-Krastanow mode molecular beam epitaxy. The same scaling function was over a wide range dot density. indicated that fluctuation, normalized average size, is constant for all densities studied. resemblance to submonolayer homoepitaxial growth implies strain not essential factor determining dots.

The temperature dependence of the Rutherford backscattering in 〈001〉 axial channeling mode for each constituent atom single-crystal ${\mathrm{YBa}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7\mathrm{\ensuremath{-}}\mathrm{y}}$ has been carried out to study a change structural properties at superconducting transition. Anomalies behavior observed across transition suggest instability or lattice. anomalies Y and Ba atoms phonon softening, while those Cu O are not explained terms only but probably...

A stable, non-dissipative, and conservative flux-reconstruction (FR) scheme is constructed demonstrated for the compressible Euler Navier–Stokes equations. proposed FR framework adopts a split form (also known as skew-symmetric form) convective terms. Sufficient conditions to satisfy both primary conservation (PC) kinetic energy preservation (KEP) properties are rigorously derived by polynomial-based analysis general framework. It found that needs be expressed in PC or KEP each property...

An a-axis oriented 400 Å YBa2Cu3O7−δ film has been epitaxially deposited on a NdGaO3 (110) substrate by rf magnetron sputtering using single YBa2Cu5Ox target. excitation frequency of 94.92 MHz, seven times as high the conventionally used 13.56 results in lower self-bias voltage which reduces degradation films caused resputtering due to negatively charged oxygen. Sharp streaks corresponding c-axis lattice parameter have observed reflection high-energy electron diffraction, showing that is...

The newly developed unifying discontinuous formulation based on flux reconstruction and lifting collocation penalty (LCP) approaches for conservation laws is extended to solve the Navier-Stokes equations 3D mixed grids. In current development, tetrahedrons triangular prisms are considered. LCP an extension of (FR) method arbitrary element types. As with FR method, it can unify several popular high order methods including Galerkin spectral volume into a more efficient differential form...

The high-order flux reconstruction (FR) method on unstructured hexahedral grids is coupled with the localized artificial diffusivity (LAD) scheme for aiming at accurate simulation of shock-turbulence interaction. In order to overcome known robustness issues particularly (r>0) derivative formulation, important properties bulk viscosity (ABV) profile affecting solution are investigated first. For purpose comparison, an approximated Gaussian filter and modified restriction-prolongation (RP)...

An efficient implicit lower-upper symmetric Gauss-Seidel (LU-SGS) solu- tion approach has been applied to a high order spectral volume (SV) method for un- structured tetrahedral grids. The LU-SGS solver is preconditioned by the block ele- ment matrix, and system of equations then solved with LU decomposition. compact feature SV reconstruction facilitates solution algorithm even discretizations. developed shown more than an magnitude speed-up relative Runge-Kutta explicit scheme typical...

Large-eddy simulations of an ideally expanded supersonic jet at Mach number 1.8 are performed by a high-order unstructured grid solver for aiming the validation aeroacoustic applications. The developed is based on flux reconstruction scheme to discretize hexahedral grids. localized artificial diffusivity employed capture shock waves robustly and retain accuracy away from shocks. turbulent flow obtained FR-LAD using degree polynomial up p=4. computed results in reasonable agreement with...

Summary To robustly and accurately simulate wall‐bounded turbulent flows at high Reynolds numbers, we propose suitable boundary treatments for wall‐modeled large‐eddy simulation (WMLES) coupled with a high‐order flux reconstruction (FR) method. First, show the need to impose an auxiliary condition on variables (solution gradients) that are commonly introduced in discontinuous finite element methods (DFEMs). Auxiliary conditions WMLES, where grid resolution is too coarse resolve inner layer...

We studied the scaling law for volume distribution of self-assembled quantum dots grown by molecular-beam epitaxy Stranski-Krastanow mode. The was found to hold regardless annealing time and growth temperature. Also, we pair dots. Both agreed with functions two-dimensional submonolayer homoepitaxy model critical cluster size $i=1,$ which excludes adatom detachment from clusters.

Residual Ga and As atoms in SiOx SiNy dielectric films deposited on GaAs were investigated by Rutherford backscattering spectroscopy particle-induced x-ray emission techniques. Both detected the after high temperature heat treatment, even as-deposited. The magnitude of residual presumably out-diffused from substrates was order 1×1019 /cm3. concentration prevails over that SiOx/GaAs systems as is generally known, vice versa SiNy/GaAs treatment. Dynamic behavior functions annealing time cannot...

A high-order flux reconstruction (FR) scheme on unstructured hexahedral grids is coupled with the localized artificial diffusivity (LAD) for aiming at accurate simulation of shock-turbulence interactions. Suitable procedure derived ensuring global discrete conservation. We then propose a simple and efficient filter obtaining smooth distribution meshes, which one key issues developing robust LAD method meshes. The proposed has favorable properties sub-cell shock capturing length scale Ο(h p ⁄...

The first experimental results of InGaAs ternary alloys and InGaAs/InP superlattices investigated by ion channeling methods are reported. All samples grown metalorganic chemical vapor deposition. It is emphasized that the small atomic displacements from virtual crystal points in have a very important role for dechanneling. Furthermore, it revealed dechanneling fractions along 〈100〉 directions which lattice mismatches (0.1∼0.3%) not explained model strained-layer superlattice, even if alloy...

Backscattering yields of 1.00-MeV ${\mathrm{He}}^{+}$ ions on $1T$-Ta${\mathrm{S}}_{2}$ are reported from room temperature to 120 K. The dependence the backscattering yield exhibits softening an acoustic mode and optical mode. An anomalously large peak in with hysteresis was observed around nearly commensurate transition temperature, indicating existence a disordered state. A small 280 K heating, new this material.

Proton-induced x-ray emission combined with ion channeling techniques has been used to investigate the lattice location of Cr in GaAs grown by Czochralski method. The angular dependence yields about 〈100〉 and 〈110〉 directions indicated that atoms occupied substitutional sites no trace well-defined interstitials at concentrations studied. Fe Ni impurities Cr-doped were located whereas Cu more likely distributed among random respect host atoms.

The use of n-type modulation doping to reduce the threshold current, carrier lifetime, and internal loss in 1.3-/spl mu/m InGaAsP-InP strained multiquantum-well (MQW) lasers is experimentally demonstrated. current density, were reduced by about 33%, 36%, 28%, respectively, as compared with an undoped MQW laser. Moreover, turn-on delay time modulation-doped a low-leakage buried heterostructure was 35%. These results confirm suitability this type laser for basic structure monolithic array used...

An appropriate procedure to construct symmetric conservative metrics is presented for the high-order flux-reconstruction scheme on three-dimensionally moving and deforming grids. The present framework enables direct discretization of strong conservation form governing equations without any errors in freestream preservation global properties. We demonstrate that a straightforward implementation often fails metric polynomials having same order as solution polynomial, which severely degrades...