针对盘山路存在的转弯盲区，即在转弯时司机无法得知弯路对面是否有车辆通过，设计一种基于C8051F310的山路转弯预防警示系统。该系统利用一阶滤波算法检测山路转弯时是否有车辆通过。运用该算法可增强系统检测的实时性，提高检测机动车辆的灵敏度，同时大大减少环境温度对检测的干扰。试验表明该系统能够正确指示出在山路转弯时是否有车辆通过，目前该系统已安装在盘山路上，可大大减少事故的发生率。 Abstract: Aiming at passing hilly road，there is a turn blind spot.Motormen usually do not know if the passing of vehicles pass the road.So a system of defending accident on hilly road is designed,which is based on MCU C8051F310.The sys-tem uses the first-order filter algorithm to detect whether there are passing vehicles.This algorithm enhances the real-time detection and improves the sensitivity of detection vehicles.Meanwhile,it reduces the detection interference of environmen-tal temperature.The experimental results show that this system can exactly indicate if there are passing vehicles.At present,the system has been successfully applied to hilly road.The system can greatly decrease accident.
上传时间： 2013-10-10
上传用户：归海惜雪
多远程二极管温度传感器-Design Considerations for pc thermal management Multiple RDTS (remote diode temperature sensing) provides the most accurate method of sensing an IC’s junction temperature. It overcomes thermal gradient and placement issues encountered when trying to place external sensors. PCB component count decreases when using a device that provides multiple inputs.Better temperature sensing improves product performance and reliability. Disk drive data integrity suffers at elevated temperatures. IBM published an article stating that a 5°C rise in operating temperature causes a 15% increase in the drive’s failure rate. The overall performance of a system can be improved by providing a more accurate temperature measurement of the most critical devices allowing them to run just a few degrees hotter.The LM83 directly senses its own temperature and the temperature of three external PN junctions. One is dedicated to the CPU of choice, the other two go to other parts of your system that need thermal monitoring such as the disk drive or graphics chip. The SMBus-compatible LM83 supports SMBus timeout and logic levels. The LM83 has two interrupt outputs; one for user-programmable limits and WATCHDOG capability (INT), the other is a Critical Temperature Alarm output (T_CRIT_A) for system power supply shutdown.
标签： Considerat Design 远程 二极管
上传时间： 2014-12-21
上传用户：ljd123456
针对UHF读写器设计中，在符合EPC Gen2标准的情况下，对标签返回的高速数据进行正确解码以达到正确读取标签的要求，提出了一种新的在ARM平台下采用边沿捕获统计定时器数判断数据的方法，并对FM0编码进行解码。与传统的使用定时器定时采样高低电平的FM0解码方法相比，该解码方法可以减少定时器定时误差累积的影响；可以将捕获定时器数中断与数据判断解码相对分隔开，使得中断对解码影响很小，实现捕获与解码的同步。通过实验表明，这种方法提高了解码的效率，在160 Kb/s的接收速度下，读取一张标签的时间约为30次/s。 Abstract: Aiming at the requirement of receiving correctly decoded data from the tag under high-speed communication which complied with EPC Gen2 standard in the design of UHF interrogator， the article introduced a new technology for FM0 decoding which counted the timer counter to judge data by using the edge interval of signal capture based on the ARM7 platform. Compared with the traditional FM0 decoding method which used the timer timed to sample the high and low level， the method could reduce the accumulation of timing error and could relatively separate capture timer interrupt and the data judgment for decoding， so that the disruption effect on the decoding was small and realizd synchronization of capture and decoding. Testing result shows that the method improves the efficiency of decoding， at 160 Kb/s receiving speed， the time of the interrogator to read a tag is about 30 times/s.
上传时间： 2013-11-10
上传用户：liufei
为了提高直接转矩控制（DTC）系统定子磁链估计精度，降低电流、电压测量的随机误差，提出了一种基于扩展卡尔曼滤波（EKF）实现异步电机转子位置和速度估计的方法。扩展卡尔曼滤波器是建立在基于旋转坐标系下由定子电流、电压、转子转速和其它电机参量所构成的电机模型上，将定子电流、定子磁链、转速和转子角位置作为状态变量，定子电压为输入变量，定子电流为输出变量，通过对磁链和转速的闭环控制提高定子磁链的估计精度，实现了异步电机的无速度传感器直接转矩控制策略，仿真结果验证了该方法的可行性,提高了直接转矩的控制性能。 Abstract: In order to improve the Direct Torque Control（DTC） system of stator flux estimation accuracy and reduce the current， voltage measurement of random error， a novel method to estimate the speed and rotor position of asynchronous motor based on extended Kalman filter was introduced. EKF was based on d-p axis motor and other motor parameters （state vector: stator current， stator flux linkage， rotor angular speed and position； input: stator voltage； output: staror current). EKF was designed for stator flux and rotor speed estimation in close-loop control. It can improve the estimated accuracy of stator flux. It is possible to estimate the speed and rotor position and implement asynchronous motor drives without position and speed sensors. The simulation results show it is efficient and improves the control performance.
上传时间： 2015-01-02
上传用户：qingdou
A dissipative particle swarm optimization is developed according to the self-organization of dissipative structure. The negative entropy is introduced to construct an opening dissipative system that is far-from-equilibrium so as to driving the irreversible evolution process with better fitness. The testing of two multimodal functions indicates it improves the performance effectively. structure. The negative entropy is introduced to construct an opening dissipative system that is far-from-equilibrium so as to driving the irreversible evolution process with better fitness. The testing of two multimodal functions indicates it improves the performance effectively.
标签： self-organization optimization dissipative developed
上传时间： 2016-03-31
上传用户：zgu489
Writing this book was hard work, but also a lot of fun. Thanks to everyone who made it possible, especially Jinny Verdonck, Thomas Kraft, Ricky Nkrumah, Kirk Bateman, and the whole Apress crew. A big thanks goes also to the community that continuously extends and improves J2ME Polish!
标签： everyone possible Writing Thanks
上传时间： 2016-04-15
上传用户：Yukiseop
Fast Fourier Transform power point The rectangular window introduces broadening of any frequency components [`smearing鈥? and sidelobesthat may overlap with other frequency components [`leakage鈥?. 鈥he effect improves as Nincreases 鈥owever, the rectangle window has poor properties and better choices of wncan lead to better spectral properties [less leakage, in particular] 鈥搃.e. instead of just truncating the summation, we can pre-multiply by a suitable window function wnthat has better frequency domain properties. 鈥ore on window design in the filter design section of the course
标签： rectangular introduces broadening Transform
上传时间： 2017-03-25
上传用户：change0329
[开源 绿色软件] [运行环境 Windows XP/7/8/10] [语言 简体/繁體/English/Unicode] A cool music player. Powered by Bass and BassVis. 极简本地音乐播放器，透明、纯文本界面。支持轻媒体库、歌词、可视化。最小化到托盘，占用资源少，适合边听音乐边工作。 应网友要求，加入了Tag编辑、自动切换列表、播放队列、鼠标手势、均衡器、音频设备选择、全局音量滚轮（托盘区域）、字体设置、极简模式、鼠标穿透、嵌入桌面、简单布局等功能。 homepage> mcool.appinn.me ==================================================== 音频格式APE、FLAC、WavPack、MP3、OGG、TTA、TAK、Musepack、AAC、AC3、WMA、Wav、CD、ALAC、Aiff、MOD、CUE ==================================================== 更新历史: 3336 -2016.3.25 点睛之笔：任意布局（追上foobar2000）。Arbitrary layout (all in one). 3330 -2016.3.10 一体布局之比例调节（初具foobar2000风貌）。Ratio adjust (all in one). 3308 -2015.11.28 歌词微调（在选项>常规>鼠标手势里设置）。Adds function of lyrics tuning. 3306 -2015.11.15 电台模式（整点时切换歌曲或列表，并非在线音乐），以及多声卡支持。Adds radio mode, and multi sound card support. 3300 -2015.10.15 完善细节，修复切歌卡住bug。完美版。Fixes some bugs. 3280 -2015.8.1 简单布局功能。Layout (all in one) function. 3260 -2015.6.1 Win10模式。Win10 mode. 3252 -2015.5.10 任务栏进度条。Taskbar progress display. 3236 -2015.4.10 点睛之笔：透明度调节。Adds function of transparency tuning. 3232 -2015.3.25 自定义软件名（请在mcool.ini中手动修改）。Adds function of customizing app name. 3230 -2015.3.12 Airplay复刻界面。Airplay interface copy. 3218 -2015.1.20 桌面歌词。Desktop lyrics. 3216 -2015.1.12 一体化界面（学习Foobar2000和豆瓣FM）。All in one interface. 3212 -2015.1.6 新增Winamp音效插件支持（学习千千静听），以及滚轮穿透功能（学习Airplay3）。Adds Winamp DSP plugins support, and adds function of wheel transparent. Winamp音效插件下载：http://uploadgeneration.info/Winamp/www.winamp.com/plugins/dsp-effect/5/top-rated.html 3210 -2014.12.28 重要更新：本地音量调节、自定义鼠标键/手势。Adds local volume control, and adds fuction of customizing mouse control / gesture. 3208 -2014.11.25 简化右键菜单，常规项目移到选项窗口。Simplifies the popup menu, moves the general items to option window. 3206 -2014.11.22 新增文本对齐选项，重新设计导航按钮。Adds option of text alignment, and redesigns the buttons of playback. 3202 -2014.11.10 新增播放记忆、片段循环（Hotkey: Ctrl+1/2）和贴边隐藏功能。Adds functions of playback memory, AB repeat and screen side hide. 3200 -2014.11.5 新增无界面选项（先去掉托盘图标，然后Ctrl+Alt+W隐藏界面，Ctrl+Alt+X关闭）。Adds option of no interface. 3191 -2014.8.26 嵌入桌面。Pins to desktop. 3190 -2014.8.19 音乐管理第一步：列表分组。Playlists grouping. 3186 -2014.8.10 基于列表的分级系统（Hotkey:0..5）。Rating system based on playlist. 3181 -2014.8.1 启用新图标（由虹吸墨作者BGLL友情制作）。Uses the new icon. 3180 -2014.7.22 新增Win7任务栏特效。Adds windows 7 taskbar effect. 3166 -2014.6.29 重要更新：自动下载专辑封面（源于歌词迷）。Downloads album covers from geci.me. 3160 -2014.6.1 重要更新：新增极简模式，以及OGG/Opus内置封面显示功能。Adds minimalist mode, and adds function of displaying cover embedded in OGG/Opus. 3152 -2014.5.18 添加托盘右键菜单，新增MP4/M4A(ALAC)内置封面显示功能。Adds systray popup menu, and adds function of displaying cover embedded in MP4/M4A(ALAC). 3151 -2014.5.1 重新设计可视化效果，新增示波器效果。Redesigns visual effects, and adds oscilloscope effect. 3150 -2014.4.20 采用歌词迷API下载歌词。Downloads lyrics from geci.me. 3136 -2014.3.30 加入可选的按钮，以及鼠标穿透功能。Adds function of transparent window. 3132 -2014.3.6 简化界面，向Foobar2K看齐；增加正在播放面板。Simplifies the interface, and adds now playing panel. 3130 -2014.2.26 重要更新：按照专辑分组。Grouping by album. 3120 -2014.2.18 优化字体渲染（Windows7/8下）。Optimizes font rendering in Windows 7/8. 3110 -2014.1.26 点睛之笔：自定义字体颜色。Adds function of customizing font color. 3108 -2013.11.16 Last.fm同步功能（请到主页下载插件）。Last.fm scrobbler support. 3106 -2013.11.8 可回溯的随机播放（学习Airplay 2）。Random playback can be traced back. 3103 -2013.10.12 优化右键菜单。Optimizes popup menu. 3102 -2013.9.30 修改滚动条样式，增加音频缓冲选项。Modifies style of scroll bar, and adds option of audio buffer length. 3100 -2013.9.10 无边框设计；迷你模式也可以不置顶（Hotkey:T）。Borderless designs. 3086 -2013.8.20 增加歌词面板功能。Adds function of lyrics panel. 3082 -2013.8.08 增加在可视化界面显示歌词功能。Adds function of displaying lyrics on visual interface. 3080 -2013.8.01 新增设置字体功能，恢复简单的自动关机功能。Adds function of setting font, and re-adds simple function of auto shutdown. 3060 -2013.6.26 修复在迷你模式停止响应的Bug，去掉自动关机、歌词调整功能。Fixes bug of stop responding in mini mode, and removes functions of auto shutdown and lyrics trimming. 3050 -2013.5.23 增加手势功能。Adds gesture function. 3030 -2013.3.10 增加Aero磨砂玻璃效果[如需源码请联系我]，XP/Win7/8无差别显示，按Insert键开启。Adds aero glass effect. 3020 -2013.2.23 增加简易Tag编辑功能（选中并单击即可，相当于资源管理器中的重命名，按照[歌手 - 歌名][专辑]格式进行编辑）。Adds function of editing audio tags (select and click, edit with [artist - title][album] format). 3010 -2013.1.23 应网友要求，加入读取内嵌CUE、歌词及专辑封面功能。Adds function of reading CUE, LRC and album cover built in media. 3002 -2012.11.03 无按钮设计；微调进度条尺寸。Buttonless design; modifies the size of the progress bar. 3001 -2012.10.15 重要改进，界面即按钮：单击 - 播放/暂停，按住 - 前进。Important update, the interface is a button: Click - Play/Pause, Hold Down - Next. 3000 -2012.9.28 增加Win8模式。Adds Win8 mode option. 2982 -2012.8.26 在Win8下使用微软雅黑字体。Uses Microsoft YaHei font in Windows 8 CHS. 2981 -2012.8.20 视频以插件提供（请到主页下载），增加单曲循环功能。Adds function of repeat track. 2980 -2012.7.26 简化代码，去掉视频和MIDI支持。Removes the video and MIDI support. 2970 -2012.7.20 增加媒体信息显示功能。Adds function of displaying media info. 2960 -2012.6.28 增加专辑封面显示功能（Hotkey:Ins）。Adds function of displaying album cover. 2956 -2012.6.01 再次简化界面。Simplifies the interface again. 2952 -2012.4.28 增加音频设备选择功能：DS、ASIO、WASAPI。Adds function of selecting playback device. 2950 -2012.3.30 *增加滚轮调节音量功能（在托盘，中键静音）和媒体键支持。Adds function of setting volume by mouse wheel (over systray, middle click to mute), and adds multimedia keys support. 2936 -2012.3.17 微调界面，修复物理删除失效的BUG。Fine-tunes the interface, and restores the physical delete function. 2930 -2012.2.27 增加TAK格式支持。Adds TAK format support. 2923 -2012.2.12 紧急修复上一版出现的字体模糊BUG（Vista/Win7下），增加在任务栏显/隐图标功能（Ctrl+T）。Fixes font vague bug for Vista/Win7, and adds showing/hiding icon on taskbar function. 2920 -2012.2.08 微调界面，优化CPU占用（启用背景图片时）。Fine-tunes the interface, and optimizes CPU utilization (while enable background image). 2912 -2012.1.12 增加播放队列功能。Adds playback queue function. 2910 -2011.12.25 改进迷你模式，增加查找功能。improves mini mode, and adds find function. *注：此功能对杀毒软件过敏，开启方法：按F1进入选项，勾选全局快捷键。The feature is allergic to the anti-virus software.
上传时间： 2016-06-10
上传用户：fanghua
The PW5200A/ PW5200C is high efficiency synchronous, PWM step-up DC/DC converters optimizedto provide a high efficient solution to medium power systems. The devices work with a 1.4MHz fixedfrequency switching. These features minimize overall solution footprint by allowing the use of tiny,low profile inductors and ceramic capacitors. Automatic PWM/PFM mode switching at light loadsaves power and improves efficiency
标签： pw5200
上传时间： 2022-02-11
上传用户：
以AT89S52单片机为控制核心,采用电容降压技术,Buck电路拓扑,PWM驱动模块和功率器件散热设计,通过高速的数据采集、主功率输入输出模块和控制模块,设计一种新型智能车载充电器.在充电过程中,通过负脉冲瞬间放电实现对铅酸蓄电池的再生修复,提高电池的有效容量,延长使用寿命.该充电器体积小、速度快、效率高、可靠性好.With AT89S52 single chip computer as the control core,a new type of intelligent car-carried charger was designed by using capacitance step-down technology,Buck circuit topology,PWM driving module and power device heat dissipation design,through high-speed data acquisition,main power input and output module and control module.In the charging process,the regeneration and repair of lead-acid batteries are realized by instantaneous discharge of negative pulse,which improves the effective capacity of batteries and prolongs their service life.The charger has the advantages of small size,fast speed,high efficiency and good reliability.
标签： 车载充电器
上传时间： 2022-03-27
上传用户：
