this book help us to understand many things about comunications
標簽: comunications understand things about
上傳時間: 2013-12-15
上傳用戶:jhksyghr
us as a a a a a a a a aa a a a a a a a a a aa a a a a a a a a
上傳時間: 2013-12-14
上傳用戶:561596
We are providing the best information available to us as at date of writing and intend to update it at frequent intervals as things change and/or more information becomes available. However we intend this Q&A as a guide only and recommend that users obtain specific information to determine applicability to their specific requirements. (This is another way of saying that we can t be held liable or responsible for the content.)
標簽: information providing available writing
上傳時間: 2017-07-22
上傳用戶:四只眼
LDAP introduction, it makes us know more
標簽: introduction makes LDAP know
上傳時間: 2013-12-17
上傳用戶:wpt
This is a very good book that tells us about gabor tranform and gabor filters
標簽: gabor tranform filters about
上傳時間: 2014-01-05
上傳用戶:xaijhqx
US-110超聲波測距模塊ALTIUM設計硬件原理圖+PCB工程文件+CS100A-CS102等相關器件技術資料,US-110: 10mm收發一體探頭。
標簽: 超聲波測距模塊
上傳時間: 2022-01-27
上傳用戶:
脈沖電暈法煙氣脫硫脫硝技術是利用電暈放電產生的高能電子與中性分子碰撞,產生自由基和活性粒子,在有氨加入的條件下,將SO2、NOx轉化為硫銨和硝銨。根據現有脈沖電暈法電源設備不能大規模工業化實踐應用的缺點,設計了一種新型的高頻高壓交直流疊加的脫硫脫硝電源。 本文重點介紹了交、直流電源的工作原理,對電源中的串聯諧振情況進行了具體的分析,交流電源采用串聯負載串聯諧振的工作方式,直流電源采用并聯負載串聯諧振的工作方式。通過變壓器升壓和諧振升壓,可使交流電壓的上升率大于200V/us,直流電壓可達到上萬伏。同時計算了電源的主要參數,為實驗打下基礎。為了進一步提高交流電壓的頻率,針對感性負載,采用全橋移相軟開關控制策略,為開關器件提供零電壓關斷條件。通過理論分析、仿真及實驗對軟、硬開關過程及損耗進行比較,證明軟開關對提高開關頻率的促進作用。 為方便對交、直流電壓幅值進行調節,設計了電源控制系統,采用兩個數字PID控制器,能同時對二者的幅值進行控制,并以液晶和鍵盤作為人機交互界面,方便用戶的操作。 交直流疊加的電源可以使反應器產生穩定、寬范圍、有效的流光。交流電壓使放電增強,產生的自由基多,氧化脫除量增加。直流基壓驅使正離子和電子離開流光通道,自由基分布更廣,與SO2等接觸面增加,增強脫硫脫硝效果。 本文也對脫硫脫硝系統的電磁干擾情況進行分析,并采用接地、屏蔽、隔離等方法提高系統的電磁兼容性能。
上傳時間: 2013-04-24
上傳用戶:6546544
在團簇與激光相互作用的研究中和在團簇與加速器離子束的碰撞研究中,需要對加速器束流或者激光束進行脈沖化與時序同步,同時用于測量作用產物的探測系統如飛行時間譜儀(TOF)等要求各加速電場的控制具有一定的時序匹配。在整個實驗中,需要用到符合要求的多路脈沖時序信號控制器,而且要求各脈沖序列的周期、占空比、重復頻率等方便可調。為此,本論文基于FPGA設計完成了一款多路脈沖時序控制電路。 本文基于Altera公司的Cyclone系列FPGA芯片EPlC3T100C8,設計出了一款可以同時輸出8路脈沖序列、各脈沖序列之間具有可調高精度延遲、可調脈沖寬度及占空比等。論文討論了FPGA芯片結構及開發流程,著重討論了較高頻率脈沖電路的可編程實現方法,以及如何利用VHDL語言實現硬件電路軟件化設計的技巧與方法,給出了整個系統設計的原理與實現。討論了高精密電源的PWM技術原理及實現,并由此設計了FPGA所需電源系統。給出了配置電路設計、數據通信及接口電路的實現。開發了上層控制軟件來控制各路脈沖時序及屬性。 該電路工作頻率200MHz,輸出脈沖最小寬度可達到10ns,最大寬度可達到us甚至ms量級。可以同時提供l路同步脈沖和7路脈沖,并且7路脈沖相對于同步脈沖的延遲時間可調,調節步長為5ns。
上傳時間: 2013-06-15
上傳用戶:ZJX5201314
This document was developed under the Standard Hardware and Reliability Program (SHARP) TechnologyIndependent Representation of Electronic Products (TIREP) project. It is intended for use by VHSIC HardwareDescription Language (VHDL) design engineers and is offered as guidance for the development of VHDL modelswhich are compliant with the VHDL Data Item Description (DID DI-EGDS-80811) and which can be providedto manufacturing engineering personnel for the development of production data and the subsequent productionof hardware. Most VHDL modeling performed to date has been concentrated at either the component level orat the conceptual system level. The assembly and sub-assembly levels have been largely disregarded. Under theSHARP TIREP project, an attempt has been made to help close this gap. The TIREP models are based upon lowcomplexity Standard Electronic Modules (SEM) of the format A configuration. Although these modules are quitesimple, it is felt that the lessons learned offer guidance which can readily be applied to a wide range of assemblytypes and complexities.
上傳時間: 2014-12-23
上傳用戶:xinhaoshan2016
Abstract: It is incredible how many programmable logic controls (PLCs) around us make our modern life possible and pleasant.Machines in our homes heat and cool our air and water, as well as preserve and cook our food. This tutorial explains the importanceof PLCs, and describes how to choose component parts using the parametric tools on the Maxim's website.A similar version of this article was published February 29, 2012 in John Day's Automotive Electronic News.
上傳時間: 2013-11-10
上傳用戶:liaocs77