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.
标签： invisibility constructed proposed electrom
上传时间： 2013-12-18
上传用户：13215175592
orumThemes.com - Breezet vBulletin Theme www.forumthemes.com ForumThemes.com would like to thank you for purchasing one of our themes. If at anytime you have any problems with installation please visit our forums at www.forumthemes.com/forums. Included - Fluid XML files - Custom Java Script for drop downs (clientscript) (All it does is remove the little white arrows in the drop downs)
标签： com ForumThemes forumthemes orumThemes
上传时间： 2017-04-06
上传用户：q123321
* The IMAP toolkit provided in this Distribution is * Copyright 2000 University of Washington. * The full text of our legal notices is contained in the file called * CPYRIGHT, included with this Distribution.
标签： Distribution University Washington Copyright
上传时间： 2013-11-30
上传用户：cazjing
I2C core code in Hardware descrption language so as enable a cpld/fpga to be programmed for specific customized applications of our requirment & make the pcb work to meet the application requirements.
标签： descrption programmed Hardware language
上传时间： 2014-12-20
上传用户：许小华
ScienceOps has answers. Rapid Custom Algorithm development www.ScienceOps.com Simpleware From 3D scan to CAD, FE/CFD, and RP Join our Webinar on March 12th www.simpleware.com Steganography Software Hide Secrets Using this Powerful Steganography Software. $39 InvisibleSecrets.com Develop VoIP softphone SIP softphone SDK (activeX & DLL) Add VoIP in your app/webpages. www.vaxvoip.com
标签： ScienceOps development Simpleware Algorithm
上传时间： 2017-04-13
上传用户：qlpqlq
This paper presents a novel technique to increase the quality of medical images based on Histogram Equalization. In the proposed method first we have applied a noise reduction method and then we apply some suitable preprocessing on histogram of the medical images and after that histogram equalization has been applied on the new histogram. our proposed method in despite of its simplicity has better results in compare to other usual methods based on histogram equalization. The quality of resulted images after applying our proposed methods has been tested on a database (medical images) with a confirmed criterion by viewer. Also we have considered a mathematical criterion for comparing our proposed algorithm with other available methods for contrast enhancement. Results show the better efficiency of the proposed method.
标签： Histogram technique increase presents
上传时间： 2017-04-20
上传用户：VRMMO
Sensing and planning are at the core of robot motion. Traditionally, mobile robots have been used for performing various tasks with a general-purpose processor on-board. This book grew out of our research enquiry into alternate architectures for sensor-based robot motion. It describes our research starting early 2002 with the objectives of obtaining a time, space and energy-efficient solution for processing sensor data for various robotic tasks. New algorithms and architectures have been developed for exploration and other aspects of robot motion. The research has also resulted in design and fabrication of an FPGA-based mobile robot equipped with ultrasonic sensors. Numerous experiments with the FPGA-based mobile robot have also been performed and they confirm the efficacy of the alternate architecture.
标签： Traditionally planning Sensing motion
上传时间： 2013-12-20
上传用户：古谷仁美
As I write this foreword, I am collaborating with four leading user interface (UI) component vendors on a presentation for the 2004 JavaOneSM conference. In our presentation, the vendors will show how they leverage JavaServerTM Faces technology in their products. While developing the presentation, I am learning some things about the work we’ve been doing on JavaServer Faces for the past three years. The vendors have their own set of concerns unique to adapting their product for JavaServer Faces, but they all voice one opinion loud and clear: they are very relieved to finally have a standard for web-based user interfaces.
标签： collaborating component interface foreword
上传时间： 2014-08-27
上传用户：时代电子小智
In communication systems channel poses an important role. channels can convolve many different kind of distortions to our information. In perticular wireless channels multipath distortion is sevear. and more sevear is such distortion is random. To handle this, multipath affected channels require Equalizers at receaver end. such equalizer uses different learning Algorithms for identifying channels continuously. This project is VHDL implementation of LMS learning algorithm with pipelined architecture. so this implementation can work with higher data rates with less clock speed requirments and so with less power consumpiton It uses Fixed point arithmatic blocks for filtering so suitable for coustom asic.
标签： communication important different channels
上传时间： 2013-12-08
上传用户：litianchu
G UILLAIN-BARRéSYNDROME(GBS)is an uncommon disorder,but one whose impact is far out of proportion to its incidence.Despite a usually good prognosis,GBS is a particularly frightening and often life- altering experience for those diagnosed with the disorder.Many patients are acutely aware of the rapid loss of control of their muscular function, including vital functions such as breathing and swallowing,and fre- quently feel that they are dying.The experience is almost as unnerving for the families of affected individuals.During the acute phase of the ill- ness GBS patients experience the indignity of helplessness in addition to their fear of death or permanent disability.Prolonged disability is com- mon and some permanent residual effects are becoming increasingly recognized.It has been our experience in meeting patients at support groups,that individuals who have been affected by GBS have a great desire for a better understanding of the disorder,even years after the acute experience.
标签： UILLAIN-BARR proportion SYNDROME disorder
上传时间： 2017-07-11
上传用户：cuibaigao
