In this paper, stability results of main concern for control theory are given for nite-dimensional linear fractional diierential systems. For fractional diier-ential systems in state-space form, both internal and external stabilities are investigated. For fractional diierential systems in polynomial representation, external stability is thoroughly examined. Our main qualitative result is that s...

Although the magnetorotational instability (MRI) has been widely accepted as a powerful accretion mechanism in magnetized accretion disks, it has not been realized in the laboratory. The possibility of studying MRI in a rotating liquid-metal annulus (Couette flow) is explored by local and global stability analysis and magnetohydrodynamic (MHD) simulations. Stability diagrams are drawn in dimens...

Reversible and adaptive integration methods based on Kustaanheimo-Stiefel regular-ization and modiied Sundman transformations are applied to simulate general perturbed Kepler motion and to compute classical trajectories of atomic systems (e.g. Rydberg atoms). The new family of reversible adaptive regularization (RAR) methods also conserve angular momentum and exhibit superior energy conservatio...

INTRODUCTION Primary stability achieved by press-fit is critical for the longterm success of cementless hip stems [1]. It is recognized that micromotions over 30-150 micron prevent osteointegration and lead to implant failure [2]. Conversely, excessive press-fit can cause intra-op fractures [3]. A device able to intraoperatively assess stem stability was developed and validated [4]. It consists...

The testing method using Barkhausen noise (B.N) is a particular method, which can be applied on ferromagnetic materials. It is a magnetic non destructive evaluation (NDE) method and can provide very important information about the material microstructure. The work here presented documents the ability to determine the metallurgical state of steel. A new approach is studied of defects; microstruc...

The imbalance between accuracy and computational cost is a defect in track association. In response to the defect, the track association problem is transformed into an on-line clustering problem with constraints, and a novel track association algorithm is proposed based on Leader-Follower online clustering. In the algorithm, we take a track as a Leader or a Follower based on its type and make F...

An intelligent design method of double screen frequency selective surfaces (FSSs) is addressed in this paper. The employed unit cell is composed of two metallic screens, which are printed on both sides of a substrate. The presented non-trial-and-error approach is investigated based on the separate design of each screen. With the help of some physical intuition and an equivalent circuit model, i...