It was proposed that perfect invisibility cloaks can be constructed for hiding objects from electromagnetic illumination (Pendry et al., Science 312, p. 1780). The cylindrical cloaks experimentally demonstrated (Schurig et al., Science 314, p. 997) and theoretically proposed (Cai et al., Nat. Photon. 1, p. 224) have however simplified material parameters in order to facilitate easier realization as well as to avoid infinities in optical constants. Here we show that the cylindrical cloaks with simplified material parameters inherently allow the zeroth-order cylindrical wave to pass through the cloak as if the cloak is made of a homogeneous isotropic medium, and thus visible. To all high-order cylindrical waves, our numerical simulation suggests that the simplified cloak inherits some properties of the ideal cloak, but finite scatterings exist.
標(biāo)簽： invisibility constructed proposed electrom
上傳時(shí)間： 2013-12-18
上傳用戶：13215175592
A cylindrical wave expansion method is developed to obtain the scattering field for an ideal two-dimensional cylindrical invisibility cloak. A near-ideal model of the invisibility cloak is set up to solve the boundary problem at the inner boundary of the cloak shell. We confirm that a cloak with the ideal material parameters is a perfect invisibility cloak by systematically studying the change of the scattering coefficients from the near-ideal case to the ideal one. However, due to the slow convergence of the zeroth order scattering coefficients, a tiny perturbation on the cloak would induce a noticeable field scattering and penetration.
標(biāo)簽： cylindrical scattering expansion developed
上傳時(shí)間： 2017-03-30
上傳用戶：lhc9102
This the Firmware code for the ADE7758 for the PIC Micro controller for the computation of three phase parameters.
標(biāo)簽： the for computation controller
上傳時(shí)間： 2017-04-01
上傳用戶：lanwei
A fourier filter for time-series signals. Does not require the Signal Processing Toolbox. There is an interactive version with sliders that allow you to adjust the filter parameters continuously while observing the effect on your signal dynamically.
標(biāo)簽： time-series Processing fourier Toolbox
上傳時(shí)間： 2013-12-19
上傳用戶：change0329
Interactive smoothing for time-series signals, with sliders that allow you to adjust the smoothing parameters continuously while observing the effect on your signal dynamically. Run SmoothSliderTest to see how it works.
標(biāo)簽： smoothing Interactive time-series signals
上傳時(shí)間： 2014-12-07
上傳用戶：xinyuzhiqiwuwu
MULTIPLE ACCESS TECHNIQUES - THE MAIN ACCESSING TECHNIQUES USED IN MOBILE COMMUNICATIONS: PERFORMANCE AND CHARACTERISTICS -Duplex transmissions - Multiple access in mobile communications -Characteristics and parameters of FDMA systems - The characteristics and parameters of the TDMA systems - The characteristics and parameters of CDMA systems -Packet Radio – PR - ALOHA
標(biāo)簽： TECHNIQUES COMMUNICATIONS ACCESSING MULTIPLE
上傳時(shí)間： 2013-12-23
上傳用戶：watch100
This document explains how to read the RADARSAT data CD provided with the book "Digital Processing of Synthetic Aperture Data" by Ian Cumming and Frank Wong, Artech House, 2005. On this web site, programs are provided in MATLAB to read the data and parameters from the CD. The structure of the programs is outlined in Figure 1. There are two main programs and one function that are used to extract
標(biāo)簽： Processing the RADARSAT document
上傳時(shí)間： 2013-12-16
上傳用戶：561596
This functions computes SARMA or multiplicative (p,q) x (P,Q) models for (p,q,P,Q) in (pvec x qvec x Pvec x Qvec) it returns the best according to AIC where AIC has been modified to account for fixed parameters x = input data pvec = vector of p s set pvec=[0] for no AR qvec = vector of q s set qvec=0[] for no MA Pvec = vector of P s Qvec = vector of Q s T period for multiplicative model
標(biāo)簽： multiplicative functions computes models
上傳時(shí)間： 2017-06-30
上傳用戶：Breathe0125
軟件功能：32位圖形界面程序，可提供PG8139.EXE(DOS版)所具有的一切功能。 軟件亮點(diǎn)：對(duì)“8139網(wǎng)卡改制硬盤還原卡”的所有硬件參數(shù)改寫，通過點(diǎn)擊鼠標(biāo)數(shù)次即可完成！-software functions : 32 graphics interface procedures, available PG8139.EXE (DOS version) have all functions. Software Spotlight : "8139 NIC restructuring disk reduction cards" all hardware parameters changed. click through several can be accomplished
上傳時(shí)間： 2017-07-16
上傳用戶：zhuoying119
The program uses fminsearch to obtain the transfer function of a tank’s height. This tank is then controlled using a real PID controller. Controller’s tuning (determination of optimum controller’s parameters: gain and time constants) is achieved using the genetic algorithm toolbox. Finally, result are plotted using both matlab commands as well as simulink.
標(biāo)簽： tank fminsearch function transfer
上傳時(shí)間： 2013-12-01
上傳用戶：rocwangdp
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