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  • Self Healing Key Distribution With Revocation

    Self Healing Key Distribution With Revocation

    標(biāo)簽: Distribution Revocation Healing Self

    上傳時(shí)間: 2014-01-27

    上傳用戶:xuan‘nian

  • Abstract-In this paper, simple autonomous chaotic circuits coupled by resistors are investigated. B

    Abstract-In this paper, simple autonomous chaotic circuits coupled by resistors are investigated. By carrying out computer calculations and circuit experiments, irregular self-switching phenomenon of three spatial patterns characterized by the phase states of quasi-synchronization of chaos can be observed from only four simple chaotic circuits. This is the same phenomenon as chaotic wandering of spatial patterns observed very often from systems with a large number of degrees of freedom. Namely, one of spatial-temporal chaos observed from systems of large size can be also generated in the proposed system consisting of only four chaotic circuits. A six subcircuits case and a coupled chaotic circuits networks are also studied, and such systems are confirmed to produce more complicated spatio-temporal phenomena.

    標(biāo)簽: investigated Abstract-In autonomous resistors

    上傳時(shí)間: 2014-06-09

    上傳用戶:h886166

  • All New Electronics Self-Teaching Guide (2008)

    All New Electronics Self-Teaching Guide (2008)

    標(biāo)簽: Self-Teaching Electronics Guide 2008

    上傳時(shí)間: 2014-11-22

    上傳用戶:xuanjie

  • A BIST (BUILT-IN SELF-TEST) STRATEGY FOR MIXED-SIGNAL INTEGRATED CIRCUITS

    A BIST (BUILT-IN SELF-TEST) STRATEGY FOR MIXED-SIGNAL INTEGRATED CIRCUITS

    標(biāo)簽: MIXED-SIGNAL INTEGRATED SELF-TEST BUILT-IN

    上傳時(shí)間: 2013-12-03

    上傳用戶:xzt

  • Aodv for NS-2. A mobile ad-hoc network (MANET) is a kind of wireless ad-hoc network, and is a self-c

    Aodv for NS-2. A mobile ad-hoc network (MANET) is a kind of wireless ad-hoc network, and is a self-configuring network of mobile routers connected wirelessly. MANET may operate in a standalone fashion, or may be connected to the larger Internet. Many routing protocols have been developed for MANETs over the past few years. This project evaluated three specific MANET routing protocols which are Ad-hoc On-demand Distance Vector (AODV), Dynamic Source Routing (DSR) and Dynamic MANET Ondemand routing protocol (DYMO) to better understand the major characteristics of these routing protocols. Different performance aspects were investigated in this project including packet delivery ratio, routing overhead, throughput and average end-to-end delay.

    標(biāo)簽: network ad-hoc wireless mobile

    上傳時(shí)間: 2014-01-12

    上傳用戶:zsjzc

  • This is a very good book on self learning electronics from Wiley publications and is very useful to

    This is a very good book on self learning electronics from Wiley publications and is very useful to understand basics of electronics for some one shifting from computer science to embedded system development

    標(biāo)簽: very publications electronics learning

    上傳時(shí)間: 2017-09-24

    上傳用戶:playboys0

  • 高壓變頻器前側(cè)逆變晶閘管自供電驅(qū)動(dòng)系統(tǒng)研究與設(shè)計(jì).rar

    隨著電力電子技術(shù)的發(fā)展,高壓換流設(shè)備在工業(yè)應(yīng)用中日益廣泛。其核心元件晶閘管(SCR)的電壓與電流越來越高(已達(dá)到10KV/10KA以上),應(yīng)用場(chǎng)合要求也越來越高。在國際上,晶閘管的光控技術(shù)發(fā)展日益成熟。根據(jù)對(duì)國內(nèi)晶閘管技術(shù)發(fā)展前景和需求的展望,本文采用自供電驅(qū)動(dòng)技術(shù)與光控技術(shù)相結(jié)合,研發(fā)光控自供電晶閘管驅(qū)動(dòng)控制板,然后與晶閘管本體相結(jié)合即形成光控晶閘管工程化實(shí)現(xiàn)模型,其可作為光控晶閘管的替代技術(shù)。 在工程應(yīng)用中,光控晶閘管的典型應(yīng)用場(chǎng)合為四象限高壓變頻器和國家大型直流輸變電系統(tǒng)等。隨著國家節(jié)能工程的實(shí)施,高壓變頻器的應(yīng)用范圍越來越廣泛,已成為工業(yè)節(jié)能中的重要環(huán)節(jié)。高壓直流換流系統(tǒng)難度大,技術(shù)復(fù)雜,要求高,本論文研究的光控晶閘管替代技術(shù)只作為其儲(chǔ)備技術(shù)之一。本論文以電流源型高壓變頻器作為該光控晶閘管替代技術(shù)的應(yīng)用背景重點(diǎn)闡述。 電流源型高壓變頻器為了提高單機(jī)容量,通常是數(shù)個(gè)SCR串聯(lián)使用。隨著系統(tǒng)容量越來越大,裝置對(duì)高壓開關(guān)器件的要求也越來越高。如果一組串聯(lián)SCR中某一個(gè)SCR該導(dǎo)通時(shí)沒有導(dǎo)通,那么加在該組SCR上的電壓都將加到該SCR上形成過電壓,造成該器件的擊穿損壞,甚至于一組串聯(lián)SCR都被燒壞。為了克服上述問題,保證高壓變頻器中串聯(lián)晶閘管能夠安全可靠的工作,提高系統(tǒng)可靠性,有必要為晶閘管配備后備驅(qū)動(dòng)系統(tǒng)。本文提出了給SCR驅(qū)動(dòng)電路增設(shè)自供電驅(qū)動(dòng)系統(tǒng)——SPDS (Self—Powered Drive System)的解決辦法。SPDS基本功能是通過高位取能電路利用RC緩沖電路中的能量為監(jiān)測(cè)電路和后備觸發(fā)電路提供正常工作所需要的能量。它的優(yōu)點(diǎn)是由于緩沖電路與晶閘管同電位,自供電驅(qū)動(dòng)系統(tǒng)要求的電壓隔離水平可以從幾千伏降低到幾百伏,節(jié)省了高壓隔離變壓器,節(jié)省了成本和體積,提高了系統(tǒng)可靠性。國外對(duì)相關(guān)內(nèi)容已經(jīng)有了深入研究,并將其應(yīng)用在高壓變頻器產(chǎn)品中。在國內(nèi),目前還沒有查到相關(guān)文獻(xiàn)。本文為基于晶閘管的電流源型高壓變頻器設(shè)計(jì)了一種高壓晶閘管自供電驅(qū)動(dòng)系統(tǒng),填補(bǔ)了國內(nèi)空白,為自供電驅(qū)動(dòng)系統(tǒng)的推廣應(yīng)用和其他高壓開關(guān)器件自供電驅(qū)動(dòng)系統(tǒng)的研制提供了參考。 本文詳細(xì)介紹了串聯(lián)高壓晶閘管驅(qū)動(dòng)系統(tǒng)的要求和RC緩沖電路的工作特 點(diǎn),進(jìn)而提出了SPDS的工作原理和具體實(shí)現(xiàn)方式,闡述了SPDS各部分組成及其功能。SPDS的核心技術(shù)是取能回路和觸發(fā)方式的設(shè)計(jì)。本文在比較各種高壓取能方式和觸發(fā)方式優(yōu)缺點(diǎn)的基礎(chǔ)上,選擇采用RC緩沖取能方式和光纖觸發(fā)方式。 論文基于Multisim10仿真軟件,結(jié)合高壓晶閘管自供電驅(qū)動(dòng)系統(tǒng)取能電路的原理,對(duì)高壓晶閘管自供電驅(qū)動(dòng)系統(tǒng)的核心部分——SPDS取能電路進(jìn)行了仿真。通過搭建帶SPDS取能電路的單相晶閘管仿真電路和電流源型高壓變頻器前側(cè)變流電路的仿真模型,詳細(xì)討論了影響RC取能回路正常工作的各種因素。同時(shí),通過設(shè)定仿真電路的參數(shù),分析了其工作狀況。根據(jù)得到的仿真波形圖,證明了高壓晶閘管自供電驅(qū)動(dòng)系統(tǒng)可以達(dá)到有效觸發(fā)晶閘管導(dǎo)通的設(shè)計(jì)目標(biāo),具有可行性。 為考察SPDS的實(shí)際工作性能,本文搭建了簡易的SPDS低壓硬件實(shí)驗(yàn)平臺(tái),為其高壓條件下的工程化應(yīng)用打好了基礎(chǔ)。 在論文的最后,對(duì)高壓晶閘管自供電驅(qū)動(dòng)系統(tǒng)的發(fā)展方向進(jìn)行了展望。 關(guān)鍵詞:高壓變頻器;晶閘管驅(qū)動(dòng);自供電系統(tǒng);高壓換流;光控晶閘管

    標(biāo)簽: 高壓變頻器 逆變 晶閘管

    上傳時(shí)間: 2013-05-26

    上傳用戶:riiqg1989

  • 干涉型光纖水聽器信號(hào)解調(diào)方法研究

    光纖水聽器自問世以來,在巨大的軍事價(jià)值和民用價(jià)值推動(dòng)下得到了迅速發(fā)展,已逐漸從實(shí)驗(yàn)室研究階段走向工程應(yīng)用。同時(shí)隨著光纖水聽器的不斷發(fā)展,對(duì)水聲信號(hào)的檢測(cè)技術(shù)以及數(shù)字處理能力也提出了新的要求。論文在此背景下開展了一系列研究工作,并提出了利用FPGA(Field ProgrammableGate Array,現(xiàn)場(chǎng)可編程門陣列)實(shí)現(xiàn)光纖3×3耦合器解調(diào)算法的新思路。 目前干涉型光纖水聽器的解調(diào)一般采用PGC(Phase Generated Carrier,相位生成載波技術(shù))技術(shù)和基于3×3光纖耦合器干涉的解調(diào)技術(shù)。PGC技術(shù)在解調(diào)過程中引入了載波信號(hào),它對(duì)采樣率,激光器等的要求都較高,因此我們把目光投向3×3耦合器解調(diào)技術(shù),文中對(duì)其解調(diào)原理進(jìn)行了闡述,對(duì)采樣率的確定進(jìn)行了討論,并對(duì)3×3耦合器三路輸出不對(duì)稱的情況進(jìn)行了分析,最后在本文的結(jié)論部分提出了基于3×3耦合器解調(diào)的改良方案。 目前,光纖信號(hào)數(shù)字化解調(diào)的硬件實(shí)現(xiàn)采用DSP(Digital Signal Process,可編程數(shù)字信號(hào)處理器)信號(hào)處理機(jī),與之相比,F(xiàn)PGA解調(diào)具有速度快、資源占用少、易于擴(kuò)展等優(yōu)勢(shì)。本文對(duì)FPGA與DSP、ASIC(application-specificintegrated circuit,專用集成電路)實(shí)現(xiàn)方案進(jìn)行了對(duì)比,分析了適合利用FPGA實(shí)現(xiàn)的算法所應(yīng)具備的特征;介紹了3×3耦合器解調(diào)算法中各個(gè)模塊的設(shè)計(jì)情況;分析了系統(tǒng)的工作情況,硬件的構(gòu)造及芯片的選擇,最后驗(yàn)證了利用FPGA可以實(shí)現(xiàn)3×3耦合器解調(diào)算法。

    標(biāo)簽: 干涉型 光纖水聽器 信號(hào)解調(diào) 方法研究

    上傳時(shí)間: 2013-07-03

    上傳用戶:love1314

  • 基準(zhǔn)電壓的溫度漂移研究應(yīng)用筆記

    Abstract: A perfect voltage reference produces a stable voltage independent of any external factors. Real-world voltagereferences, of course, are subject to errors caused by many external factors. One causeof these major errors istemperature. Without care, it is easy to operate a voltage reference outside its operating temperature range. Thisapplication note describes how references respond to temperature changes, and how self-heating can cause a voltagereference to operate outside its recommended temperature range. Once understood, this knowledge can then be used toavoid making this design error.

    標(biāo)簽: 基準(zhǔn)電壓 溫度漂移 應(yīng)用筆記

    上傳時(shí)間: 2013-11-08

    上傳用戶:xianglee

  • 利用數(shù)字電位器調(diào)整并校準(zhǔn)升壓型DC-DC轉(zhuǎn)換器

    The purpose of this application note is to show an example of how a digital potentiometer can be used in thefeedback loop of a step-up DC-DC converter to provide calibration and/or adjustment of the output voltage.The example circuit uses a MAX5025 step-up DC-DC converter (capable of generating up to 36V,120mWmax) in conjunction with a DS1845, 256 position, NV digital potentiometer. For this example, the desiredoutput voltage is 32V, which is generated from an input supply of 5V. The output voltage can be adjusted in35mV increments (near 32V) and span a range wide enough to account for resistance, potentiometer and DCDCconverter tolerances (27.6V to 36.7V).

    標(biāo)簽: DC-DC 數(shù)字電位器 升壓型 校準(zhǔn)

    上傳時(shí)間: 2014-12-23

    上傳用戶:781354052

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