The use of dual polarization in mobile satellite systems is very promising as a means for increasing the transmission capacity. In this paper we study a system which uses simultaneously two orthogonal polarizations in order to communicate with the users. The application of MIMO signal processing techniques along with Adaptive Coding and Modulation in the forward link can provide remarkable thro...

in this article, the sliding mode control of frequency load control of power systems is studied. the study areaconsists of a system of water and heat. first, a mathematical model of the proposed system disturbances ismade and then sliding control mode for frequency load control is provided. by the system simulation andsliding mode control, it can be shown that the damping of oscillations is wel...

Let H be a separable Hilbert space, let G ⊂ H, and let A be an operator on H. Under appropriate conditions on A andG, it is known that the set of iterations FG(A) = {Ag | g ∈ G, 0 ≤ j ≤ L(g)} is a frame for H. We call FG(A) a dynamical frame for H, and explore further its properties; in particular, we show that the canonical dual frame of FG(A) also has an iterative set structure. We explore th...

Abstract We consider a general twisted shift-invariant system, $V^{t}(\mathcal {A})$ , consisting of translates countably many generators and study the problem obtaining characterization for system to form frame sequence or Riesz sequence. illustrate our theory with some examples. In addition these results, we dual also obtain an orthonormal from given translates.

In this paper, the tangent, binormal, normal and unit Darboux vectors of the dual curve on the one–parameter dual spherical motion are obtained with respect to a unit dual orthogonal frame for dual 3–space D.

Based on analyzing the related technologies of the original video retrieval, we proposed an algorithm of adaptive dual-threshold shot boundary detection for the game video of TV. At the beginning, we convert each frame to the HSV space, set high and low ratio of threshold according to the frame difference. Then, the average value of frame difference in the sliding window is calculated to receiv...

This paper aims to review the challenges wider adoption of VR technologies for language education at university level, focusing on teaching English as a foreign (TEFL). The first portion classifies these challenges, outlined in current literature, into seven main themes: “Lack TEFL-Specific Content,” “Difficulty Integrate Learning and Evaluation,” “Supporting Various Approaches,” “Uncertainty O...