Strong interest has arisen in accelerator-driven spallationneutron sources that surpass existing facilities (such as ISIS at Rutherford or LANSCE at Los Alamos) by more than an order of magnitude in beam power delivered to the spallation target. The approach chosen by Los Alamos (as well as the European Spallation Source) provides the full beam energy by acceleration in a linac as opposed to pr...

The aim of this paper is to improve the convergence rate of frame algorithm based on Richardson iteration and Chebyshev methods. Based on Richardson iteration method, we first square the existing convergence rate of frame algorithm which in turn the number of iterations would be bisected and increased speed of convergence is achieved. Afterward, by using Chebyshev polynomials, we improve this s...

The paper treats the semi active isolation of a single equipment, acceleration sensitive, by means of a variable elastic control device. A numerical study on a single degree of freedom (SDOF) structural model equipped with a continuously variable elastic device subjected to harmonic input is presented. The utilized control algorithm is derived by the Lyapunov method and specialized in order to ...

In plasma based acceleration (PBA), the methods of injecting high quality electron bunches into the accelerating wakefield is of utmost importance for various applications, including next generation light sources and high energy colliders. Numerous simulations are being conducted in order to study various methods of injection and to optimize the beam parameters. Particle-In-Cell simulations usi...

In order to efficiently and accurately identify the cutting condition of a shearer, this paper proposed an intelligent multi-sensor data fusion identification method using the parallel quasi-Newton neural network (PQN-NN) and the Dempster-Shafer (DS) theory. The vibration acceleration signals and current signal of six cutting conditions were collected from a self-designed experimental system an...

Laser-powered acceleration of charged particles promises extraordinary acceleration gradients due to the immense power available from lasers. This possibility has led to many proposed structures for laser acceleration; however, the field of vacuum laser acceleration is almost wholly unexplored experimentally. Recent advances in laser efficiency and phase synchronization have made possible a pra...

Beam's multiple-contact mode, characterized by multiple and discrete contact regions, non-uniform stoppers' heights, irregular contact sequence, seesaw-like effect, indirect interaction between different stoppers, and complex coupling relationship between loads and deformation is studied. A novel analysis method and a novel high speed calculation model are developed for multiple-contact mode un...

Introduction: Dynamic contrast enhanced (DCE) imaging employs serial T1-weighted scans to quantify the pharmacokinetics of an injectable contrast agent. This allows assessment of tissue properties such as vascular permeability. Clinical applications of DCE, such as tumor characterization, will benefit from improvements in spatiotemporal resolution and volume coverage beyond what is possible tod...