A simple approach to calculate the amplitude component of a wave front propagating in space from a hologram is proposed. It is able to calculate the amplitude distribution on a plane at any distance rapidly using a st...A simple approach to calculate the amplitude component of a wave front propagating in space from a hologram is proposed. It is able to calculate the amplitude distribution on a plane at any distance rapidly using a standard GPU. This is useful for analyzing and reconstructing the 3D image encoded on a hologram.展开更多
A new method called local accurate search is put forward to calculate the allowable area for air-to-surface missiles based on the conventional methods. Comparing with traditional methods, the local accurate search met...A new method called local accurate search is put forward to calculate the allowable area for air-to-surface missiles based on the conventional methods. Comparing with traditional methods, the local accurate search method can search the area online and reduce the time of search with the required precision. Combining the traditional flight range table with a model calculation method, the new method employs the local search to fred an accurate result, which will meet the fast-calculation requirements for attacking moving targets. In this way, the missiles are adapted for the complex warfare situation.展开更多
First principle calculations have been performed to study the electron structures and magnetic properties of transition metal doped ruilles in order to predict room temperature diluted magnetic semiconductors. Differe...First principle calculations have been performed to study the electron structures and magnetic properties of transition metal doped ruilles in order to predict room temperature diluted magnetic semiconductors. Different doping configurailons have been calculated to find the preferred doping site. The ground state energies of both FM and AFM states have been calculated to study the magnetic coupling between the dopants. The calculation results show the Co doped mutile has a Curie temperature of 1438 K. Co doped mille films have been prepared on Si substrate by magnetron sputtering. X-ray diffraction results show that the deposited film is ruille. Hysteresis loop curves measured by vibration sample magnetization show that the film is ferromagnetic at root temperature.展开更多
In this paper,we propose,analyze,and test a new fully discrete,efficient,decoupled,stable,and practically second-order time-stepping algorithm for computing MHD ensemble flow averages under uncertainties in the initia...In this paper,we propose,analyze,and test a new fully discrete,efficient,decoupled,stable,and practically second-order time-stepping algorithm for computing MHD ensemble flow averages under uncertainties in the initial conditions and forcing.For each viscosity and magnetic diffusivity pair,the algorithm picks the largest possible parameter q 2[0,1]to avoid the instability that arises due to the presence of some explicit viscous terms.At each time step,the algorithm shares the same system matrix with all J realizations but has different right-hand-side vectors for all J realizations.This saves assembling time and computer memory,allows the reuse of the same preconditioner,and can take the advantage of block linear solvers.For the proposed algorithm,we prove stability and convergence rigorously.To illustrate the predicted convergence rates of our analysis,numerical experiments with manufactured solutions are given on a unit square domain.Finally,we test the scheme on a benchmark channel flow over a step problem and it performs well.展开更多
基金the UK Engineering and Physical Sciences Research Council (EPSRC) for the support through the Platform Grant in Liquid Crystal Photonics
文摘A simple approach to calculate the amplitude component of a wave front propagating in space from a hologram is proposed. It is able to calculate the amplitude distribution on a plane at any distance rapidly using a standard GPU. This is useful for analyzing and reconstructing the 3D image encoded on a hologram.
文摘A new method called local accurate search is put forward to calculate the allowable area for air-to-surface missiles based on the conventional methods. Comparing with traditional methods, the local accurate search method can search the area online and reduce the time of search with the required precision. Combining the traditional flight range table with a model calculation method, the new method employs the local search to fred an accurate result, which will meet the fast-calculation requirements for attacking moving targets. In this way, the missiles are adapted for the complex warfare situation.
基金This project was financially supported by the National Natural Science Foundation of China (Nos. 50325209, 50232030, and 50572005).
文摘First principle calculations have been performed to study the electron structures and magnetic properties of transition metal doped ruilles in order to predict room temperature diluted magnetic semiconductors. Different doping configurailons have been calculated to find the preferred doping site. The ground state energies of both FM and AFM states have been calculated to study the magnetic coupling between the dopants. The calculation results show the Co doped mutile has a Curie temperature of 1438 K. Co doped mille films have been prepared on Si substrate by magnetron sputtering. X-ray diffraction results show that the deposited film is ruille. Hysteresis loop curves measured by vibration sample magnetization show that the film is ferromagnetic at root temperature.
文摘In this paper,we propose,analyze,and test a new fully discrete,efficient,decoupled,stable,and practically second-order time-stepping algorithm for computing MHD ensemble flow averages under uncertainties in the initial conditions and forcing.For each viscosity and magnetic diffusivity pair,the algorithm picks the largest possible parameter q 2[0,1]to avoid the instability that arises due to the presence of some explicit viscous terms.At each time step,the algorithm shares the same system matrix with all J realizations but has different right-hand-side vectors for all J realizations.This saves assembling time and computer memory,allows the reuse of the same preconditioner,and can take the advantage of block linear solvers.For the proposed algorithm,we prove stability and convergence rigorously.To illustrate the predicted convergence rates of our analysis,numerical experiments with manufactured solutions are given on a unit square domain.Finally,we test the scheme on a benchmark channel flow over a step problem and it performs well.
