ADI公司的引用笔记，讲解了锁相环在通信接收机和发射机的应用
标签： transmitters frequency receivers high pll for and
上传时间： 2017-03-13
上传用户：rfzhangyicheng
1．Describe a Θ(n lg n)-time algorithm that, given a set S of n integers and another integer x, determines whether or not there exist two elements in S whose sum is exactly x. (Implement exercise 2.3-7.) #include<stdio.h> #include<stdlib.h> void merge(int arr[],int low,int mid,int high){ int i,k; int *tmp=(int*)malloc((high-low+1)*sizeof(int)); int left_low=low; int left_high=mid; int right_low=mid+1; int right_high=high; for(k=0;left_low<=left_high&&right_low<=right_high;k++) { if(arr[left_low]<=arr[right_low]){ tmp[k]=arr[left_low++]; } else{ tmp[k]=arr[right_low++]; } } if(left_low<=left_high){ for(i=left_low;i<=left_high;i++){ tmp[k++]=arr[i]; } } if(right_low<=right_high){ for(i=right_low;i<=right_high;i++) tmp[k++]=arr[i]; } for(i=0;i<high-low+1;i++) arr[low+i]=tmp[i]; } void merge_sort(int a[],int p,int r){ int q; if(p<r){ q=(p+r)/2; merge_sort(a,p,q); merge_sort(a,q+1,r); merge(a,p,q,r); } } int main(){ int a[8]={3,5,8,6,4,1,1}; int i,j; int x=10; merge_sort(a,0,6); printf("after Merging-Sort:\n"); for(i=0;i<7;i++){ printf("%d",a[i]); } printf("\n"); i=0;j=6; do{ if(a[i]+a[j]==x){ printf("exist"); break; } if(a[i]+a[j]>x) j--; if(a[i]+a[j]<x) i++; }while(i<=j); if(i>j) printf("not exist"); system("pause"); return 0; }
上传时间： 2017-04-01
上传用户：糖儿水嘻嘻
The CommScope InstaPATCH® 360 and ReadyPATCH® solutions utilize a standards-compliant multi-fiber connector to provide high density termination capability. The connector is called an MPO (Multi-fiber Push On) connector by the standards. In many cases, multi-fiber connector products are referred to as MTP connectors. This document is intended to clarify the difference between the two terms – MPO and MTP.
上传时间： 2017-04-12
上传用户：asdfghjkl1234567890
在本课中，我们要用一个按键来实现跑马灯的 10 级调速。这又会涉及到键的去抖的问 题。 本课的试验结果是，每按一次按键，跑马速度就降低一级，共 10 级。 这里我们又增加了一个变量 speedlever，来保存当前的速度档次。 在按键里的处理中，多了当前档次的延时值的设置。 请看程序： ―――――――――――――――― #define uchar unsigned char //定义一下方便使用 #define uint unsigned int #define ulong unsigned long #include <reg52.h> //包括一个 52 标准内核的头文件 sbit P10 = P1^0; //头文件中没有定义的 IO 就要自己来定义了 sbit P11 = P1^1; sbit P12 = P1^2; sbit P13 = P1^3; sbit K1= P3^2; bit ldelay=0; //长定时溢出标记,预置是 0 uchar speed=10; //设置一个变量保存默认的跑马灯的移动速度 uchar speedlever=0; //保存当前的速度档次 char code dx516[3] _at_ 0x003b;//这是为了仿真设置的 //一个按键控制的 10 级变速跑马灯试验 void main(void) // 主程序 { uchar code ledp[4]={0xfe,0xfd,0xfb,0xf7};//预定的写入 P1 的值 uchar ledi; //用来指示显示顺序 uint n; RCAP2H =0x10; //赋 T2 的预置值 0x1000，溢出 30 次就是 1 秒钟 RCAP2L =0x00; TR2=1; //启动定时器 ET2=1; //打开定时器 2 中断 EA=1; //打开总中断 while(1) //主程序循环 { if(ldelay) //发现有时间溢出标记，进入处理 { ldelay=0; //清除标记 P1=ledp[ledi]; //读出一个值送到 P1 口 ledi++; //指向下一个 if(ledi==4) { ledi=0; //到了最后一个灯就换到第一个 } } if(!K1) //如果读到 K1 为 0 { for(n=0;n<1000;n++); //等待按键稳定 while(!K1); //等待按键松开 for(n=0;n<1000;n++); //等待按键稳定松开 speedlever++; if(speedlever==10)speedlever=0; speed=speedlever*3; //档次和延时之间的预算法则，也可以用查表方法，做出 不规则的法则 } } } //定时器 2 中断 timer2() interrupt 5 { static uchar t; TF2=0; t++; if((t==speed)||(t>30)) //比较一个变化的数值，以实现变化的时间溢出,同时限制了最慢速 度为 1 秒 { t=0; ldelay=1;//每次长时间的溢出，就置一个标记，以便主程序处理 } } ―――――――――――――――――――――― 请打开 lesson11 目录的工程，编译，运行，看结果： 按 K1，速度则降低一次，总共 10 个档次。
上传时间： 2017-11-06
上传用户：szcyclone
Lithium–sulfur batteries are a promising energy-storage technology due to their relatively low cost and high theoretical energy density. However, one of their major technical problems is the shuttling of soluble polysulfides between electrodes, resulting in rapid capacity fading. Here, we present a metal–organic framework (MOF)-based battery separator to mitigate the shuttling problem. We show that the MOF-based separator acts as an ionic sieve in lithium–sulfur batteries, which selectively sieves Li+ ions while e ciently suppressing undesired polysulfides migrating to the anode side. When a sulfur-containing mesoporous carbon material (approximately 70 wt% sulfur content) is used as a cathode composite without elaborate synthesis or surface modification, a lithium–sulfur battery with a MOF-based separator exhibits a low capacity decay rate (0.019% per cycle over 1,500 cycles). Moreover, there is almost no capacity fading after the initial 100 cycles. Our approach demonstrates the potential for MOF-based materials as separators for energy-storage applications.
上传时间： 2017-11-23
上传用户：653357637
Lithium–sulfur (Li–S) batteries with high energy density and long cycle life are considered to be one of the most promising next-generation energy-storage systems beyond routine lithium-ion batteries. Various approaches have been proposed to break down technical barriers in Li–S battery systems. The use of nanostructured metal oxides and sulfides for high sulfur utilization and long life span of Li–S batteries is reviewed here. The relationships between the intrinsic properties of metal oxide/sulfide hosts and electrochemical performances of Li–S batteries are discussed. Nanostructured metal oxides/ sulfides hosts used in solid sulfur cathodes, separators/interlayers, lithium- metal-anode protection, and lithium polysulfides batteries are discussed respectively. Prospects for the future developments of Li–S batteries with nanostructured metal oxides/sulfides are also discussed.
上传时间： 2017-11-23
上传用户：653357637
en.CD00004003_Designing with L4973, 3.5 A high efficiency DC-DC converter,en.CD00004003_Designing with L4973, 3.5 A high efficiency DC-DC converter
上传时间： 2017-12-24
上传用户：jatcreo@qq.com
DESIGNING WITH L4978, 2A HIGH EFFICIENCY DC-DC CONVERTERY
上传时间： 2017-12-24
上传用户：jatcreo@qq.com
void IIC_Init(void) { //由于STM8单片机，可以在输入和输出条件下读取IO口状态，故直接设置为输出。 GPIO_Init(IIC_SCL_PORT, IIC_SCL_PIN, GPIO_MODE_OUT_OD_HIZ_SLOW ); GPIO_Init(IIC_SDA_PORT, IIC_SDA_PIN, GPIO_MODE_OUT_OD_HIZ_SLOW ); IIC_SCL_H; IIC_SDA_H; } //产生IIC起始信号 void IIC_Start(void) { IIC_SDA_H; IIC_SCL_H; Delay_us(); IIC_SDA_L; //START:when CLK is high,DATA change form high to low Delay_us(); IIC_SCL_L; //钳住I2C总线，准备发送或接收数据 }
上传时间： 2018-01-10
上传用户：m009988
贴片铝电解电容封装库 SMD Aluminum Electrolytic Capacitors VE Features ‧ 3 ~ 16φ, 85℃, 2,000 hours assured ‧ Chip type large capacitance capacitors ‧ Designed for surface mounting on high density PC board. ‧ RoHS Compliance
上传时间： 2018-05-09
上传用户：angel20041401
