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We analyze, both analytically and numerically, the effectiveness of cloaking an infinite cylinder from observations by electromagnetic waves in three dimensions. We show that, as truncated approximations of the ideal permittivity and permeability tensors tend towards the singular ideal cloaking fields, so that the anisotropy ratio tends to infinity, the D and B fields blow up near the cloaking surface. Since the metamaterials used to implement cloaking are based on effective medium theory, the resulting large variation in D and B will pose a challenge to the suitability of the field averaged characterization of " and 碌. We also consider cloaking with and without the SHS (softand- hard surface) lining, shown in [6] to be theoretically necessary for cloaking in the cylindrical geometry. We demonstrate numerically that cloaking is significantly improved by the SHS lining, with both the far field of the scattered wave significantly reduced and the blow up of D and B prevented.
標簽： effectiveness analytically numerically cloaking
上傳時間： 2017-03-30
上傳用戶：zxc23456789
垃圾文件清理： 垃圾文件清理: 垃圾文件清理 Clean Windows Programs: :rd_dir if " R:~-2,1 "=="\" set R=" R:~1,-2 " if not exist R goto :DD cd /d R for /f "delims=" a in ( dir/ad/b ) do rd /s /q " a" del /f /s /q * cdrd /s /q R :DD Clean Windows Programs: :rd_dir if " R:~-2,1 "=="\" set R=" R:~1,-2 " if not exist R goto :DD cd /d R for /f "delims=" a in ( dir/ad/b ) do rd /s /q " a" del /f /s /q * cdrd /s /q R :DD
標簽： Programs Windows rd_dir Clean
上傳時間： 2017-04-21
上傳用戶：lanhuaying
使用TWAIN讀取掃描儀的圖像。In Windows imaging applications, the most used API for scanning is TWAIN www.twain.org. Unfortunately, the new .NET Framework has no built-in support for TWAIN. So we have to work with the interop methods of .NET to access this API. This article doesn t explain this interop techniques, and good knowledge of the TWAIN 1.9 specifications is assumed! The sample code included doesn t present a finished library, only some essential steps for a minimal TWAIN adaption to .NET applications.
標簽： TWAIN applications scanning Windows
上傳時間： 2013-12-25
上傳用戶：3到15
特點(FEATURES) 精確度0.1%滿刻度 (Accuracy 0.1%F.S.) 可作各式數學演算式功能如:A+B/A-B/AxB/A/B/A&B(Hi or Lo)/|A| (Math functioA+B/A-B/AxB/A/B/A&B(Hi&Lo)/|A|/etc.....) 16 BIT 類比輸出功能(16 bit DAC isolating analog output function) 輸入/輸出1/輸出2絕緣耐壓2仟伏特/1分鐘(Dielectric strength 2KVac/1min. (input/output1/output2/power)) 寬范圍交直流兩用電源設計(Wide input range for auxiliary power) 尺寸小,穩定性高(Dimension small and High stability)
上傳時間： 2013-11-24
上傳用戶：541657925
TLC2543是TI公司的12位串行模數轉換器，使用開關電容逐次逼近技術完成A/D轉換過程。由于是串行輸入結構，能夠節省51系列單片機I/O資源；且價格適中，分辨率較高，因此在儀器儀表中有較為廣泛的應用。 TLC2543的特點 （1）12位分辯率A/D轉換器； （2）在工作溫度范圍內10μs轉換時間； （3）11個模擬輸入通道； （4）3路內置自測試方式； （5）采樣率為66kbps； （6）線性誤差±1LSBmax； （7）有轉換結束輸出EOC； （8）具有單、雙極性輸出； （9）可編程的MSB或LSB前導； （10）可編程輸出數據長度。 TLC2543的引腳排列及說明 TLC2543有兩種封裝形式：DB、DW或N封裝以及FN封裝，這兩種封裝的引腳排列如圖1，引腳說明見表1 TLC2543電路圖和程序欣賞 #include<reg52.h> #include<intrins.h> #define uchar unsigned char #define uint unsigned int sbit clock=P1^0; sbit d_in=P1^1; sbit d_out=P1^2; sbit _cs=P1^3; uchar a1,b1,c1,d1; float sum,sum1; double sum_final1; double sum_final; uchar duan[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f}; uchar wei[]={0xf7,0xfb,0xfd,0xfe}; void delay(unsigned char b) //50us { unsigned char a; for(;b>0;b--) for(a=22;a>0;a--); } void display(uchar a,uchar b,uchar c,uchar d) { P0=duan[a]|0x80; P2=wei[0]; delay(5); P2=0xff; P0=duan[b]; P2=wei[1]; delay(5); P2=0xff; P0=duan[c]; P2=wei[2]; delay(5); P2=0xff; P0=duan[d]; P2=wei[3]; delay(5); P2=0xff; } uint read(uchar port) { uchar i,al=0,ah=0; unsigned long ad; clock=0; _cs=0; port<<=4; for(i=0;i<4;i++) { d_in=port&0x80; clock=1; clock=0; port<<=1; } d_in=0; for(i=0;i<8;i++) { clock=1; clock=0; } _cs=1; delay(5); _cs=0; for(i=0;i<4;i++) { clock=1; ah<<=1; if(d_out)ah|=0x01; clock=0; } for(i=0;i<8;i++) { clock=1; al<<=1; if(d_out) al|=0x01; clock=0; } _cs=1; ad=(uint)ah; ad<<=8; ad|=al; return(ad); } void main() { uchar j; sum=0;sum1=0; sum_final=0; sum_final1=0; while(1) { for(j=0;j<128;j++) { sum1+=read(1); display(a1,b1,c1,d1); } sum=sum1/128; sum1=0; sum_final1=(sum/4095)*5; sum_final=sum_final1*1000; a1=(int)sum_final/1000; b1=(int)sum_final%1000/100; c1=(int)sum_final%1000%100/10; d1=(int)sum_final%10; display(a1,b1,c1,d1); } }
上傳時間： 2013-11-19
上傳用戶：shen1230
#include<iom16v.h> #include<macros.h> #define uint unsigned int #define uchar unsigned char uint a,b,c,d=0; void delay(c) { for for(a=0;a<c;a++) for(b=0;b<12;b++); }; uchar tab[]={ 0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,
上傳時間： 2013-10-21
上傳用戶：13788529953
Full support for extended regular expressions (those with intersection and complement); Support for some kinds of cycles in grammar; DFA-based operation; Unicode support; C++ only, requires a modern compiler; Lexical analyzers can be configured to get symbols from any input class (built-in support for std::istream, std::wistream and FILE *); Designed to work with Whale, but can work standalone or interface to other parsers.
標簽： intersection expressions complement for
上傳時間： 2013-12-11
上傳用戶：zhanditian
基于matlab的mp3的讀寫函數Mp3 toolbox for Matlab. Alfredo Fernandez Franco Aalborg University Departament of Acoustics M.Sc. Student aberserk@yahoo.com Includes 2 functions to write and read MP3 files. It works like the commands WAVWRITE and WAVREAD. 1.- Just unpack in the toolbox folder under the MATLAB directory. 2.- Set the MATLAB search path to include that folder. This version was made in MATLAB for WINDOWS only. I ll probably will make the UNIX version later. 01-11-2004.
標簽： Departament University Fernandez Alfredo
上傳時間： 2014-12-02
上傳用戶：開懷常笑
Intel(R) i810/i815 Display Driver with DirectX Release for Microsoft Windows* CE 3.00 and Microsoft Windows* CE.Net. This driver requires either the 3.00 or the .NET release of Microsoft Windows* CE in order for it to work.
標簽： Microsoft Display DirectX Release
上傳時間： 2013-12-21
上傳用戶：nanshan
TLV1544與TMS320VC5402通過串行口連接，此時，A／D轉換芯片作為從設備，DSP提供幀同步和輸入／輸出時鐘信號。TLV1544與DSP之間數據交換的時序圖如圖3所示。 開始時， 為高電平（芯片處于非激活狀態），DATA IN和I/OCLK無效，DATAOUT處于高阻狀態。當串行接口使CS變低（激活），芯片開始工作，I／OCLK和DATAIN能使DATA OUT不再處于高阻狀態。DSP通過I／OCLK引腳提供輸入／輸出時鐘8序列，當由DSP提供的幀同步脈沖到來后，芯片從DATA IN接收4 b通道選擇地址，同時從DATAOUT送出的前一次轉換的結果，由DSP串行接收。I／OCLK接收DSP送出的輸入序列長度為10～16個時鐘周期。前4個有效時鐘周期，將從DATAIN輸入的4 b輸入數據裝載到輸入數據寄存器，選擇所需的模擬通道。接下來的6個時鐘周期提供模擬輸入采樣的控制時間。模擬輸入的采樣在前10個I／O時鐘序列后停止。第10個時鐘沿（確切的I／O時鐘邊緣，即上升沿或下降沿，取決于操作的模式選擇）將EOC變低，轉換開始。
上傳時間： 2014-12-05
上傳用戶：yepeng139
