We obtained the energy transport velocity distribution for a three dimensional ideal cloak explicitly. Near the operation frequency, the energy transport velocity has rather peculiar distribution. The velocity along a line joining the origin of the cloak is a constant, while the velocity approaches zero at the inner boundary of the cloak. A ray pointing right into the origin of the cloak will experience abrupt changes of velocities when it impinges on the inner surface of the cloak. This peculiar distribution causes long time delays for beams passing through the ideal cloak within a geometric optics description.
标签： distribution dimensional transport obtained
上传时间： 2013-12-19
上传用户：zhliu007
一个基于spring，stucts2，hiberater架构的开发者网站，在eclipse7 blue版测试通过，服务器tomcat6，数据库mysql5.
标签： spring
上传时间： 2017-06-08
上传用户：R50974
Exploring C++ uses a series of self–directed lessons to divide C++ into bite–sized chunks that you can digest as rapidly as you can swallow them. The book assumes only a basic understanding of fundamental programming concepts (variables, functions, expressions, statements) and requires no prior knowledge of C or any other particular language. It reduces the usually considerable complexity of C++. The included lessons allow you to learn by doing, as a participant of an interactive education session. You’ll master each step in a one sitting before you proceed to the next. Author Ray Lischner has designed questions to promote learning new material. And by responding to questions throughout the text, youll be engaged every step of the way.
标签： Exploring directed lessons series
上传时间： 2014-11-15
上传用户：caiiicc
RGB，三原色光模式（英语：RGB color model），又称RGB颜色模型或红绿蓝颜色模型，是一种加色模型，将红（Red）、绿（Green）、蓝（Blue）三原色的色光以不同的比例相加，以产生多种多样的色光。RGB颜色模型的主要目的是在电子系统中检测。
标签：
上传时间： 2015-06-14
上传用户：lxy123
RGB，三原色光模式（英语：RGB color model），又称RGB颜色模型或红绿蓝颜色模型，是一种加色模型，将红（Red）、绿（Green）、蓝（Blue）三原色的色光以不同的比例相加，以产生多种多样的色光。RGB颜色模型的主要目的是在电子系统中检测
标签：
上传时间： 2015-06-14
上传用户：lxy123
I saw the light of the future when I first read Ray Kurzweil’s best-seller book The Singularity Is Near: When Humans Transcend Biology. One cubic inch of nanotube cir- cuitry, once fully developed, would be up to one hundred million times more powerful than the human brain.
标签： Predictive Cognitive Warning System Early The
上传时间： 2020-05-26
上传用户：shancjb
This chapter surveys the high temperature and oxygen partial pressure behavior of complex oxide heterostructures as determined by in situ synchrotron X-ray methods. We consider both growth and post-growth behavior, emphasizing the observation of structural and interfacial defects relevant to the size-dependent properties seen in these systems.
标签： Metal-Oxides Thin Film
上传时间： 2020-06-07
上传用户：shancjb
基础教程，亲测好用，寄存器级编程！希望对大家有帮助！示例中用到的芯片是STM32F103C8，blue pill 小板，oled 为i2c接口。
上传时间： 2021-10-25
上传用户：
FPGA采样AD9238数据并通过VGA波形显示例程 Verilog逻辑源码Quartus工程文件+文档说明,FPGA型号Cyclone4E系列中的EP4CE6F17C8，Quartus版本17.1。ADC 模块型号为 AN9238，最大采样率 65Mhz，精度为12 位。实验中把 AN9238 的 2 路输入以波形方式在 HDMI 上显示出来，我们可以用更加直观的方式观察波形，是一个数字示波器雏形。module top( input clk, input rst_n, output ad9238_clk_ch0, output ad9238_clk_ch1, input[11:0] ad9238_data_ch0, input[11:0] ad9238_data_ch1, //vga output output vga_out_hs, //vga horizontal synchronization output vga_out_vs, //vga vertical synchronization output[4:0] vga_out_r, //vga red output[5:0] vga_out_g, //vga green output[4:0] vga_out_b //vga blue);wire video_clk;wire video_hs;wire video_vs;wire video_de;wire[7:0] video_r;wire[7:0] video_g;wire[7:0] video_b;wire grid_hs;wire grid_vs;wire grid_de;wire[7:0] grid_r;wire[7:0] grid_g;wire[7:0] grid_b;wire wave0_hs;wire wave0_vs;wire wave0_de;wire[7:0] wave0_r;wire[7:0] wave0_g;wire[7:0] wave0_b;wire wave1_hs;wire wave1_vs;wire wave1_de;wire[7:0] wave1_r;wire[7:0] wave1_g;wire[7:0] wave1_b;wire adc_clk;wire adc0_buf_wr;wire[10:0] adc0_buf_addr;wire[7:0] adc0_bu
上传时间： 2021-10-27
上传用户：qingfengchizhu
FPGA读写SD卡读取BMP图片通过LCD显示例程实验 Verilog逻辑源码Quartus工程文件+文档说明,FPGA型号Cyclone4E系列中的EP4CE6F17C8，Quartus版本17.1。1 实验简介在前面的实验中我们练习了 SD 卡读写，VGA 视频显示等例程，本实验将 SD 卡里的 BMP 图片读出，写入到外部存储器，再通过 VGA、LCD 等显示。本实验如果通过液晶屏显示，需要有液晶屏模块。2 实验原理在前面的实验中我们在 VGA、LCD 上显示的是彩条，是 FPGA 内部产生的数据，本实验将彩条替换为 SD 内的 BMP 图片数据，但是 SD 卡读取速度远远不能满足显示速度的要求，只能先写入外部高速 RAM，再读出后给视频时序模块显示module top( input clk, input rst_n, input key1, output [5:0] seg_sel, output [7:0] seg_data, output vga_out_hs, //vga horizontal synchronization output vga_out_vs, //vga vertical synchronization output[4:0] vga_out_r, //vga red output[5:0] vga_out_g, //vga green output[4:0] vga_out_b, //vga blue output sd_ncs, //SD card chip select (SPI mode) output sd_dclk, //SD card clock output sd_mosi, //SD card controller data output input sd_miso, //SD card controller data input output sdram_clk, //sdram clock output sdram_cke, //sdram clock enable output sdram_cs_n, //sdram chip select output sdram_we_n, //sdram write enable output sdram_cas_n, //sdram column address strobe output sdram_ras_n, //sdram row address strobe output[1:0] sdram_dqm, //sdram data enable output[1:0] sdram_ba, //sdram bank address output[12:0] sdram_addr, //sdram address inout[15:0] sdram_dq //sdram data);parameter MEM_DATA_BITS = 16 ; //external memory user interface data widthparameter ADDR_BITS = 24
标签： fpga
上传时间： 2021-10-27
上传用户：
