Recently, vortex beam carrying orbital angular momentum (OAM) for radio communications has attracted much attention for its potential of transmitting multiple signals simultaneously at the same frequency, which can be used to increase the channel capacity. However, most of the methods for getting multi-mode OAM radio beams are of complicated structure and very high cost. This paper provides an ...

This paper investigated the flow-induced vibration of tube bundles considering effect periodic fluid force in a rotated triangular array. We first performed an experiment to obtain responses array with pitch-to-diameter ratio P/D = 1.48. To further investigate characteristics bundles, mathematical model and clearance restriction was developed. Based on Computational Fluid Dynamics calculation, ...

Consider an n by n array of cards shuffled in the following manner. An element x of the array is chosen uniformly at random; Then with probability 1/2 the rectangle of cards above and to the left of x is rotated 180 degrees, and with probability 1/2 the rectangle of cards below and to the right of x is rotated 180 degrees. It is shown by an eigenvalue method that the time required to approach t...

It has become critical to protect biometric templates in the current biometric community. One way for doing this is using a cancelable biometric method, which transforms original biometric templates in a non-invertible way and uses those transformed templates to verify a person’s identity. In this paper, we propose a new method to generate cancelable bit-strings (templates) from fingerprint min...

The problem of pattern matching with rotation is that of 2nding all occurrences of a twodimensional pattern in a text, in all possible rotations. We prove an upper and lower bound on the number of such di4erent possible rotated patterns. Subsequently, given an m × m array (pattern) and an n × n array (text) over some 2nite alphabet , we present a new method yielding an O(nm) time algorithm for ...