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3<b>dS</b>

  • 開關(guān)電源EMI整改經(jīng)驗(yàn)分享

    EMC的分類及標(biāo)準(zhǔn):EMC(E1ectromagnetic Compatibility)是電磁兼容,它包括EMI(電磁騷擾)和EMS(電磁抗騷擾)。EMC定義為:設(shè)備或系統(tǒng)在其電磁環(huán)境中能正常工作且不對該環(huán)境中的任何設(shè)備的任何事物構(gòu)成不能承受的電磁騷擾的能力。EMC整的稱呼為電磁兼容。EMP是指電磁脈沖。EMC=EMI+EMS EMI:電磁干擾EMS:電磁相容性(免疫力)EMI 可分為傳導(dǎo)Conduction及輻射Radiation兩部分,Conduction規(guī)范一般可分為:FCC Part 15J Class B;CISPR 22(EN55022,EN61000-3-2,EN61000-3-3)Class B;國標(biāo)IT類(GB9254,GB17625)和AV類(GB13837,GB17625)。FCC測試頻率在450K-30MHz,CISPR22測試頻率在150K--30MHz,Conduction可以用頻譜分析儀測試,Radiation 則必須到專門的實(shí)驗(yàn)室測試。

    標(biāo)簽: 開關(guān)電源 emi

    上傳時(shí)間: 2022-07-24

    上傳用戶:zhanglei193

  • 微電腦型數(shù)學(xué)演算式隔離傳送器

    特點(diǎn): 精確度0.1%滿刻度 可作各式數(shù)學(xué)演算式功能如:A+B/A-B/AxB/A/B/A&B(Hi or Lo)/|A|/ 16 BIT類比輸出功能 輸入與輸出絕緣耐壓2仟伏特/1分鐘(input/output/power) 寬范圍交直流兩用電源設(shè)計(jì) 尺寸小,穩(wěn)定性高

    標(biāo)簽: 微電腦 數(shù)學(xué)演算 隔離傳送器

    上傳時(shí)間: 2014-12-23

    上傳用戶:ydd3625

  • 微電腦型數(shù)學(xué)演算式雙輸出隔離傳送器

    特點(diǎn)(FEATURES) 精確度0.1%滿刻度 (Accuracy 0.1%F.S.) 可作各式數(shù)學(xué)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(shè)計(jì)(Wide input range for auxiliary power) 尺寸小,穩(wěn)定性高(Dimension small and High stability)

    標(biāo)簽: 微電腦 數(shù)學(xué)演算 輸出 隔離傳送器

    上傳時(shí)間: 2013-11-24

    上傳用戶:541657925

  • AVR單片機(jī)數(shù)碼管秒表顯示

    #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,

    標(biāo)簽: AVR 單片機(jī) 數(shù)碼管

    上傳時(shí)間: 2013-10-21

    上傳用戶:13788529953

  • 題目:利用條件運(yùn)算符的嵌套來完成此題:學(xué)習(xí)成績>=90分的同學(xué)用A表示

    題目:利用條件運(yùn)算符的嵌套來完成此題:學(xué)習(xí)成績>=90分的同學(xué)用A表示,60-89分之間的用B表示,60分以下的用C表示。 1.程序分析:(a>b)?a:b這是條件運(yùn)算符的基本例子。

    標(biāo)簽: gt 90 運(yùn)算符 嵌套

    上傳時(shí)間: 2015-01-08

    上傳用戶:lifangyuan12

  • RSA算法 :首先, 找出三個(gè)數(shù), p, q, r, 其中 p, q 是兩個(gè)相異的質(zhì)數(shù), r 是與 (p-1)(q-1) 互質(zhì)的數(shù)...... p, q, r 這三個(gè)數(shù)便是 person_key

    RSA算法 :首先, 找出三個(gè)數(shù), p, q, r, 其中 p, q 是兩個(gè)相異的質(zhì)數(shù), r 是與 (p-1)(q-1) 互質(zhì)的數(shù)...... p, q, r 這三個(gè)數(shù)便是 person_key,接著, 找出 m, 使得 r^m == 1 mod (p-1)(q-1)..... 這個(gè) m 一定存在, 因?yàn)?r 與 (p-1)(q-1) 互質(zhì), 用輾轉(zhuǎn)相除法就可以得到了..... 再來, 計(jì)算 n = pq....... m, n 這兩個(gè)數(shù)便是 public_key ,編碼過程是, 若資料為 a, 將其看成是一個(gè)大整數(shù), 假設(shè) a < n.... 如果 a >= n 的話, 就將 a 表成 s 進(jìn)位 (s

    標(biāo)簽: person_key RSA 算法

    上傳時(shí)間: 2013-12-14

    上傳用戶:zhuyibin

  • The government of a small but important country has decided that the alphabet needs to be streamline

    The government of a small but important country has decided that the alphabet needs to be streamlined and reordered. Uppercase letters will be eliminated. They will issue a royal decree in the form of a String of B and A characters. The first character in the decree specifies whether a must come ( B )Before b in the new alphabet or ( A )After b . The second character determines the relative placement of b and c , etc. So, for example, "BAA" means that a must come Before b , b must come After c , and c must come After d . Any letters beyond these requirements are to be excluded, so if the decree specifies k comparisons then the new alphabet will contain the first k+1 lowercase letters of the current alphabet. Create a class Alphabet that contains the method choices that takes the decree as input and returns the number of possible new alphabets that conform to the decree. If more than 1,000,000,000 are possible, return -1. Definition

    標(biāo)簽: government streamline important alphabet

    上傳時(shí)間: 2015-06-09

    上傳用戶:weixiao99

  • 上下文無關(guān)文法(Context-Free Grammar, CFG)是一個(gè)4元組G=(V, T, S, P)

    上下文無關(guān)文法(Context-Free Grammar, CFG)是一個(gè)4元組G=(V, T, S, P),其中,V和T是不相交的有限集,S∈V,P是一組有限的產(chǎn)生式規(guī)則集,形如A→α,其中A∈V,且α∈(V∪T)*。V的元素稱為非終結(jié)符,T的元素稱為終結(jié)符,S是一個(gè)特殊的非終結(jié)符,稱為文法開始符。 設(shè)G=(V, T, S, P)是一個(gè)CFG,則G產(chǎn)生的語言是所有可由G產(chǎn)生的字符串組成的集合,即L(G)={x∈T* | Sx}。一個(gè)語言L是上下文無關(guān)語言(Context-Free Language, CFL),當(dāng)且僅當(dāng)存在一個(gè)CFG G,使得L=L(G)。 *⇒ 例如,設(shè)文法G:S→AB A→aA|a B→bB|b 則L(G)={a^nb^m | n,m>=1} 其中非終結(jié)符都是大寫字母,開始符都是S,終結(jié)符都是小寫字母。

    標(biāo)簽: Context-Free Grammar CFG

    上傳時(shí)間: 2013-12-10

    上傳用戶:gaojiao1999

  • We have a group of N items (represented by integers from 1 to N), and we know that there is some tot

    We have a group of N items (represented by integers from 1 to N), and we know that there is some total order defined for these items. You may assume that no two elements will be equal (for all a, b: a<b or b<a). However, it is expensive to compare two items. Your task is to make a number of comparisons, and then output the sorted order. The cost of determining if a < b is given by the bth integer of element a of costs (space delimited), which is the same as the ath integer of element b. Naturally, you will be judged on the total cost of the comparisons you make before outputting the sorted order. If your order is incorrect, you will receive a 0. Otherwise, your score will be opt/cost, where opt is the best cost anyone has achieved and cost is the total cost of the comparisons you make (so your score for a test case will be between 0 and 1). Your score for the problem will simply be the sum of your scores for the individual test cases.

    標(biāo)簽: represented integers group items

    上傳時(shí)間: 2016-01-17

    上傳用戶:jeffery

  • 離散實(shí)驗(yàn) 一個(gè)包的傳遞 用warshall

     實(shí)驗(yàn)源代碼 //Warshall.cpp #include<stdio.h> void warshall(int k,int n) { int i , j, t; int temp[20][20]; for(int a=0;a<k;a++) { printf("請輸入矩陣第%d 行元素:",a); for(int b=0;b<n;b++) { scanf ("%d",&temp[a][b]); } } for(i=0;i<k;i++){ for( j=0;j<k;j++){ if(temp[ j][i]==1) { for(t=0;t<n;t++) { temp[ j][t]=temp[i][t]||temp[ j][t]; } } } } printf("可傳遞閉包關(guān)系矩陣是:\n"); for(i=0;i<k;i++) { for( j=0;j<n;j++) { printf("%d", temp[i][ j]); } printf("\n"); } } void main() { printf("利用 Warshall 算法求二元關(guān)系的可傳遞閉包\n"); void warshall(int,int); int k , n; printf("請輸入矩陣的行數(shù) i: "); scanf("%d",&k); 四川大學(xué)實(shí)驗(yàn)報(bào)告 printf("請輸入矩陣的列數(shù) j: "); scanf("%d",&n); warshall(k,n); } 

    標(biāo)簽: warshall 離散 實(shí)驗(yàn)

    上傳時(shí)間: 2016-06-27

    上傳用戶:梁雪文以

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