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.
標(biāo)簽： distribution dimensional transport obtained
上傳時間： 2013-12-19
上傳用戶：zhliu007
一個基于spring，stucts2，hiberater架構(gòu)的開發(fā)者網(wǎng)站，在eclipse7 blue版測試通過，服務(wù)器tomcat6，數(shù)據(jù)庫mysql5.
標(biāo)簽： spring
上傳時間： 2017-06-08
上傳用戶：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.
標(biāo)簽： Exploring directed lessons series
上傳時間： 2014-11-15
上傳用戶：caiiicc
RGB，三原色光模式（英語：RGB color model），又稱RGB顏色模型或紅綠藍(lán)顏色模型，是一種加色模型，將紅（Red）、綠（Green）、藍(lán)（Blue）三原色的色光以不同的比例相加，以產(chǎn)生多種多樣的色光。RGB顏色模型的主要目的是在電子系統(tǒng)中檢測。
標(biāo)簽：
上傳時間： 2015-06-14
上傳用戶：lxy123
RGB，三原色光模式（英語：RGB color model），又稱RGB顏色模型或紅綠藍(lán)顏色模型，是一種加色模型，將紅（Red）、綠（Green）、藍(lán)（Blue）三原色的色光以不同的比例相加，以產(chǎn)生多種多樣的色光。RGB顏色模型的主要目的是在電子系統(tǒng)中檢測
標(biāo)簽：
上傳時間： 2015-06-14
上傳用戶：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.
標(biāo)簽： Predictive Cognitive Warning System Early The
上傳時間： 2020-05-26
上傳用戶：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.
標(biāo)簽： Metal-Oxides Thin Film
上傳時間： 2020-06-07
上傳用戶：shancjb
基礎(chǔ)教程，親測好用，寄存器級編程！希望對大家有幫助！示例中用到的芯片是STM32F103C8，blue pill 小板，oled 為i2c接口。
上傳時間： 2021-10-25
上傳用戶：
FPGA采樣AD9238數(shù)據(jù)并通過VGA波形顯示例程 Verilog邏輯源碼Quartus工程文件+文檔說明,FPGA型號Cyclone4E系列中的EP4CE6F17C8，Quartus版本17.1。ADC 模塊型號為 AN9238，最大采樣率 65Mhz，精度為12 位。實驗中把 AN9238 的 2 路輸入以波形方式在 HDMI 上顯示出來，我們可以用更加直觀的方式觀察波形，是一個數(shù)字示波器雛形。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
上傳時間： 2021-10-27
上傳用戶：qingfengchizhu
FPGA讀寫SD卡讀取BMP圖片通過LCD顯示例程實驗 Verilog邏輯源碼Quartus工程文件+文檔說明,FPGA型號Cyclone4E系列中的EP4CE6F17C8，Quartus版本17.1。1 實驗簡介在前面的實驗中我們練習(xí)了 SD 卡讀寫，VGA 視頻顯示等例程，本實驗將 SD 卡里的 BMP 圖片讀出，寫入到外部存儲器，再通過 VGA、LCD 等顯示。本實驗如果通過液晶屏顯示，需要有液晶屏模塊。2 實驗原理在前面的實驗中我們在 VGA、LCD 上顯示的是彩條，是 FPGA 內(nèi)部產(chǎn)生的數(shù)據(jù)，本實驗將彩條替換為 SD 內(nèi)的 BMP 圖片數(shù)據(jù)，但是 SD 卡讀取速度遠(yuǎn)遠(yuǎn)不能滿足顯示速度的要求，只能先寫入外部高速 RAM，再讀出后給視頻時序模塊顯示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
標(biāo)簽： fpga
上傳時間： 2021-10-27
上傳用戶：
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