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This article takes the two-stage screw type solar array which has multi-deployment and lock function as a study object, and simplifies the joint hinge as rotation vice according to the transmission order of multi-deployment and lock joint hinge. Based on the kinematics characteristic analysis of solar array's deployment and the Kane dynamic equation, the dynamics analysis model of solar array's deployment...
This paper discusses alternative physical explanations of experimental field emission current-voltage characteristics (particularly those from carbon-nanotube arrays), and re-examines the existing theory of Fowler-Nordheim plots.
To enhance the security and reliability of the widely-used stream ciphers, a 2-D and a 3-D mesh-knight Algorithm Based Fault Tolerant (ABFT) schemes for stream ciphers are developed which can be universally applied to RC4 and other stream ciphers. Based on the ready-made arithmetic unit in stream ciphers, the proposed 2-D ABFT scheme is able to detect and correct any simple error, and the 3-D mesh-knight...
Solving complex convection-diffusion equations is very important to many practical mathematical and physical problems. After the finite difference discretization, most of the time for equations solution is spent on sparse linear equation solvers. In this paper, our goal is to solve 2D Nonlinear Unsteady Convection-Diffusion Equations by accelerating an iterative algorithm named Jacobi-preconditioned...
Field-programmable gate arrays (FPGA) are drawing increasing interest because of its performance, power consumption and configurability. They execute wide range of parallelizable algorithms which changes in accordance to variations in wireless channel statistics are utilized in smart antenna array embedded systems. In this article, we've described the FPGA implementation of a QRD processor that enables...
This paper describes an implementation of a beam former monolithic microwave integrated circuit (MMIC) for the SKA demonstrator project known as EMBRACE using the SG25H1 silicon germanium process of IHP microelectronics. This process is qualified as a high-performance technology with npn-HBTs up to ft/fmax = 180/220 GHz.
A novel method of plane wave synthesis is presented with the application of the least square method in the plane wave synthesis technique. With the linear array made up of the infinitely long current filament as the theoretical model of plane wave synthesis, the novel method is used to seek optimum amplitude and phase distribution of array element so as to make the uniform degree of the amplitude...
Practical Halbach array is only close to ideal structure, hence it has to be optimized and improved before being used in project. In this paper new approaches are presented to optimize 8-piece linear Halbach array. By changing the length, width and magnetization direction, we can get stronger magnetic field with less magnet. Optimization indexes are presented to get the reasonable length of the module;...
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