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One type of orbital angular momentum (OAM) reflectarray antenna is proposed to radiate the vortex electromagnetic wave. The phase distribution of far-zone field for the 1st mode and the 2nd mode OAM, simulated by FEKO software, demonstrates the phase singularity and vortex.
This paper is concerned with global exponential stability problem for a class of neural networks with time-varying delays. An appropriate Lyaponov-krasovskii functional (LKF) is constructed firstly. The symmetric matrices involved in the LKF are not required to be all positive definite. The obtained criterion expressed in terms of linear matrix inequalities (LMIs) shows advantages over the existing...
This paper addresses the master-slave synchronization problem of continuous time nonlinear switched systems. The idea is to use sampled-data of both the measurement output and switching signal to design feedback control laws with synchronizing controller gains. Firstly, based on input delay approach, the synchronization error system is modeled as a switched system with state delay and asynchronous...
This paper studies sampled-data control problem for networked switched linear discrete time systems. Since that the controller is connected with the plant via a communication channel, it can only access the sampled information of the switching signal and system state, where there may exist the time varying transmission delay from the sensor to the controller. The original switching signal are merged...
with the rapid development of the Internet, the explosive growth of the Internet-based technologies leads to a great improvement of cloud computing. And cloud storage technology is the pioneer of cloud computing technology. This paper proposes a system architecture of private cloud storage system. Private cloud storage system has some unique features compared to public cloud storage system. The private...
Applied undergraduate education has become an important part of China's higher education. In this paper, aiming at the Engineering program of a specialty-application-focused (SAF) undergraduate colleges and universities, we described our research on nurturing plan and teaching specialty. Based on the research, we construct a quality-guaranteed system of the engineering program of an SAF college or...
The cultivation of innovative talents has become a long-term and arduous task of our country and even of the world. In order to solve the problems existing in the process of the cultivation of innovative talents, beginning with the school training mode, through the optimization of curriculum system, changing teaching mode in teaching process, students' innovation ability is enhanced. Practice teaching...
Considering the on-board clock stability, the paper presents a method of timing calibration strategy based on the observation of pulsars, a natural celestial source, in order to improve the timing accuracy. A calibration model is established and the error factors are considered based on the characteristic of pulsars' stable and periodical signals, and the pulsar timing residuals are caused by reference...
This paper describes the design, tests and preliminary results of a triple-plane sensor detecting the X-ray pulsars vectors to acquire the spacecraft attitude. Comparing to normal attitude measurement, the triple-plane sensor has made an adversary and new effort by inventing a triple-plane structure, with the orthogonal vectors pointing towards the different directions. By measuring the power received...
Several algorithms were introduced and explored as identification ways of THz spectra in the attempt of real applications of illicit drugs detection. The results indicate that they are efficient and can be used in practice.
A method, R square coefficient (RSC), to identify eight central nervous system depressants terahertz absorption spectra by using coefficient of determination as a criterion is presented. By proper choice available range of frequency, the identification achieved 100% correction.
In order to ensure the human and equipment safety, the concept and the technique of the integrated grounding system has been introduced in high speed railway engineering in China. High running speed and dispatching density lead to large traction load currents in the power supply systems. Moreover, the high speed railway widely adopt non-ballasted track, which has a relative high rail leakage resistance...
In this paper, we propose a new scheme for free-form skeleton-driven global mesh deformations. First a Voronoi-based skeletal mesh is extracted from a given original mesh. Next the skeletal mesh is modified by free-form deformations. Then a desired global shape deformation is obtained by reconstructing the shape corresponding to the deformed skeletal mesh. Finally, using a displaced subdivision surface...
Cymbidium sinense is a popular terrestrial orchid in South China. Research involving photosynthesis, photoassimilate partitioning, respiration, water relation, mineral nutrition, growth and development of this orchid are reviewed. It is suggested that understanding C. sinense physiology may be helpful to the improvement of cultivation techniques.
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