着重阐述了设计思路、芯片选型，以及电力线通信模块及其协议设计等关键技术，并实现了以太网到电力线协议转换的软硬件设计。基于"#$%&#%$ 网络，对连接于电力线的多类家用电器进行实际测试，结果表明系统运行稳定，监控功能可靠，相关技术具有很好的实用价值。
上传时间： 2013-11-20
上传用户：cicizoe
Abstract: High-speed and low-speed data converters serve critical functions in modern broadband mobile radios. This application note outlines how todetermine high-speed data converter performance requirements in baseband sampling radio architectures. Also, system partition strategies andadvantages are outlined when considering a high-speed analog front-end (AFE) solution.
上传时间： 2013-11-02
上传用户：jjj0202
!!研究了一种新型高功率微波相移器%%%同轴插板式相移器!其设计思想为&在同轴波导内插入金属导体板!将同轴波导分为几个扇形截面波导!由于扇形截面波导中传输的82!!模相速度与同轴82; 模的相速度不同!通过改变插入金属板的长度就可以实现相移的调节.
上传时间： 2013-10-29
上传用户：banlangen
在研究传统家用燃气报警器的基础上，以ZigBee协议为平台，构建mesh网状网络实现网络化的智能语音报警系统。由于传感器本身的温度和实际环境温度的影响，传感器标定后采用软件补偿方法。为了减少系统费用，前端节点采用半功能节点设备，路由器和协调器采用全功能节点设备，构建mesh网络所形成的家庭内部报警系统，通过通用的电话接口连接到外部的公用电话网络，启动语音模块进行报警。实验结果表明，在2.4 GHz频率下传输，有墙等障碍物的情况下，节点的传输距离大约为35 m，能够满足家庭需要，且系统工作稳定，但在功耗方面仍需进一步改善。 Abstract: On the basis of studying traditional household gas alarm system, this paper proposed the platform for the ZigBee protocol，and constructed mesh network to achieve network-based intelligent voice alarm system. Because of the sensor temperature and the actual environment temperature, this system design used software compensation after calibrating sensor. In order to reduce system cost, semi-functional node devices were used as front-end node, however, full-function devices were used as routers and coordinator，constructed alarm system within the family by building mesh network，connected to the external public telephone network through the common telephone interface, started the voice alarm module. The results indicate that nodes transmit about 35m in the distance in case of walls and other obstacles by 2.4GHz frequency transmission, this is able to meet family needs and work steadily, but still needs further improvement in power consumption.
上传时间： 2013-10-30
上传用户：swaylong
Agilent AN 154 S-Parameter Design Application Note S参数的设计与应用 The need for new high-frequency, solid-state circuitdesign techniques has been recognized both by microwaveengineers and circuit designers. These engineersare being asked to design solid state circuitsthat will operate at higher and higher frequencies.The development of microwave transistors andAgilent Technologies’ network analysis instrumentationsystems that permit complete network characterizationin the microwave frequency rangehave greatly assisted these engineers in their work.The Agilent Microwave Division’s lab staff hasdeveloped a high frequency circuit design seminarto assist their counterparts in R&D labs throughoutthe world. This seminar has been presentedin a number of locations in the United States andEurope.From the experience gained in presenting this originalseminar, we have developed a four-part videotape, S-Parameter Design Seminar. While the technologyof high frequency circuit design is everchanging, the concepts upon which this technologyhas been built are relatively invariant.The content of the S-Parameter Design Seminar isas follows:
标签： S参数
上传时间： 2013-12-19
上传用户：aa54
多维多选择背包问题(MMKP)是0-1背包问题的延伸，背包核已经被用来设计解决背包问题的高效算法。目的是研究如何获得一种背包核，并以此高效处理多维多选择背包问题。首先给出了一种方法确定MMKP的核，然后阐述了利用核精确解决MMKP问题的B&B算法，列出了具体的算法步骤。在分析了算法的存储复杂度后，将算法在各种实例上的运行效果与目前解决MMKP问题的常用算法的运行效果进行了比较，发现本文的算法性能优于以往任何算法。
上传时间： 2013-11-20
上传用户：wangw7689
该电路集包括了从业界享有盛名的公司搜集到的大量最新电路，体现了丰富的设计思想。为便于读者理解和应用这些电路，本书几乎对每个电路都附有简要说明。$ C' I" t% P5 l3 V. l0 K, B 本书可供电子技术工作者、高等院校和中等专科学校师生、电子爱好者阅读和参考。( H& s, \, z6 ~% D: @
上传时间： 2013-10-19
上传用户：songnanhua
一、改变视图背景色： 在CView的OnDraw函数中添写如下一段程序代码： void CFileNameView::OnDraw(CDC＊ pDC) { CFileNameDoc* pDoc = GetDocument(); ASSERT_VALID(pDoc); CRect rectClient; CBrush brushBkColor; GetClientRect(rectClient); brushBkColor.CreateSolidBrush(RGB(255,0,0)); //颜色设置 pDC->DPtoLP(rectClient); pDC->FillRect(rectClient,&brushBkColor); … }
标签： VC代码
上传时间： 2013-10-27
上传用户：liuqy
//------------------------------------------------------------------------------------//此程序为ADC转换程序，可以选择向ADC0BUSY写1或用定时器0,1,2,3作为ADC的启动信号。////------------------------------------------------------------------------------------//头文件定义//------------------------------------------------------------------------------------//#include <c8051f330.h> #include <stdio.h> //-----------------------------------------------------------------------------// 定义16位特殊功能寄存器//----------------------------------------------------------------------------- sfr16 ADC0 = 0xbd; sfr16 TMR0RL = 0xca; sfr16 TMR1RL = 0xca; sfr16 TMR2RL =0xca; sfr16 TMR3RL =0xca; sfr16 TMR0 = 0xCC; sfr16 TMR1 = 0xCC; sfr16 TMR2 = 0xcc; sfr16 TMR3 = 0xcc; //-----------------------------------------------------------------------------// 全局变量定义//-----------------------------------------------------------------------------char i;int result; //-----------------------------------------------------------------------------//定义常量//-----------------------------------------------------------------------------#define SYSCLK 49000000 #define SAMPLE_RATE 50000 //------------------------------------------------------------------------------------// 定义函数//------------------------------------------------------------------------------------void SYSCLK_Init (void);void PORT_Init (void);void Timer0_Init (int counts);void Timer1_Init (int counts);void Timer2_Init (int counts);void Timer3_Init (int counts);void ADC0_Init(void);void ADC0_ISR (void);void ADC0_CNVS_ADC0h(void);//------------------------------------------------------------------------------------// 主程序//------------------------------------------------------------------------------------ void main (void) { int ADCRESULT[50] ; int k; PCA0MD &= ~0x40; // 禁止看门狗 SYSCLK_Init (); PORT_Init (); Timer0_Init (SYSCLK/SAMPLE_RATE); //Timer1_Init (SYSCLK/SAMPLE_RATE); //选择相应的启动方式 //Timer2_Init (SYSCLK/SAMPLE_RATE); //Timer3_Init (SYSCLK/SAMPLE_RATE); ADC0_Init(); EA=1; while(1) { //ADC0_CNVS_ADC0h(); k=ADC0; ADCRESULT[i]=result; //此处设断点，观察ADCRESULT的结果 } }
上传时间： 2013-10-13
上传用户：SimonQQ
美国Robert McNeel & Assoc.开发的PC上强大的专业3D造型软件，它可以广泛地应用于三维动画制作、工业制造、科学研究以及机械设计等领域。其设计团队是原ALIAS Design Studio设计程序师，其Beta测试版即推出以来，历经一年半的测试，是有历以来态度最严谨的网上测试。它能轻易整合3DS MAX 与Softimage的模型功能部分，对要求精细、弹性与复杂的3D NURBS模型，有点石成金的效能。能输出obj、DXF、IGES、STL、3dm等不同格式，并适用于几乎所有3D软件，尤其对增加整个3D工作团队的模型生产力有明显效果，故使用3D MAX、AutoCAD、MAYA、Softimage、Houdini、Lightwave等3D设计人员不可不学习使用。 Rhino，又叫犀牛，是一款超强的三维建模工具，大小才几十兆，硬件要求也很低。不过不要小瞧它，它包含了所有的NURBS建模功能，用它建模感觉非常流畅，所以大家经常用它来建模，然后导出高精度模型给其他三维软件使用。
标签： Rhinoceros Rhino 4.0 语言
上传时间： 2013-10-09
上传用户：aix008
