Recent advancements in nanotechnology (NT) materials and growth of micro/ nanotechnology have opened the door for potential applications of microelectro- mechanical systems (MEMS)- and NT-based sensors and devices. Such sensors and devices are best suited for communications, medical diagnosis, commercial, military, aerospace, and satellite applications. This book comes at a time when the future and well-being of Western industrial nations in the twenty-first century’s global eco- nomy increasingly depend on the quality and depth of the technological innovations they can commercialize at a rapid pace.
標(biāo)簽： MEMS
上傳時(shí)間： 2020-06-06
上傳用戶：shancjb
HIS IS THE THIRD —and most likely the last—book in the series on information technology for energy managers and web based energy infor- mation and control systems. This book concentrates on web based enterprise energy and building automation systems, and serves as a capstone volume in this series. The thrust here is that the highest level functions of a building and facility automation system are provided by a web based EIS/ECS system that provides energy management, maintenance management, overall facility operational management, and ties in with the enterprise resource management system for the entire facility or the group of facilities being managed. If there were ever to be a fourth volume in this series, it would follow the logical progression of the first three volumes, and would probably be titled Web Based Enterprise Resource Management Systems.
標(biāo)簽： Enterprise Energy Based Web
上傳時(shí)間： 2020-06-06
上傳用戶：shancjb
This book is based on a Ph.D. research that has been conducted at the Delft University of Technology in the Netherlands in collaboration with Dutch Electricity & Gas Distribution Network Operator, Stedin. This book was written as a result of wider interest that was shown by different industry groups on this topic after its public defence. This inspired the author to modify and publish a practical version of the research for a greater international audience. Therefore, the content of this book is intended for a double audience, on the one hand for those interested in the organisational and management aspects of maintenance.
標(biāo)簽： Maintenance Electricity Risk-Based Network for
上傳時(shí)間： 2020-06-07
上傳用戶：shancjb
該文檔為A Dynamic Feedback-based Load BalancingMethodology簡(jiǎn)介資料，講解的還不錯(cuò)，感興趣的可以下載看看…………………………
標(biāo)簽： 負(fù)載均衡
上傳時(shí)間： 2021-11-05
上傳用戶：
在傳統(tǒng)智能小車驅(qū)動(dòng)電路設(shè)計(jì)中,較多考慮使用直流電機(jī)還是步進(jìn)電機(jī),電機(jī)功率、能耗等性能參數(shù)。使用具有armCortexM4內(nèi)核的STM32嵌入式平臺(tái)控制四輪的4個(gè)直流電機(jī)。文章基于PWM技術(shù)及PID算法,對(duì)四輪進(jìn)行精準(zhǔn)地速度、轉(zhuǎn)向及啟停控制,實(shí)驗(yàn)表明此小車具有優(yōu)越各種地形適應(yīng)能力。In the traditional intelligent car drive circuit design,DC motor or stepping motor,motor power,energy consumption and other performance parameters are considered.The four DC motors with four wheels are controlled by STM32 embedded platform with arm Cortex M4 kernel.Based on the PWM technology and PID algorithm,the accurate ground speed,steering,and start-stop control of the four wheels are carried out.The experiment shows that the vehicle has the superior adaptability to all kinds of terrains.
標(biāo)簽： stm32 智能小車 控制系統(tǒng)
上傳時(shí)間： 2022-04-02
上傳用戶：
基于DSP28035的高速永磁無(wú)刷直流電機(jī)驅(qū)動(dòng)系統(tǒng)，包括論文和軟硬設(shè)計(jì)資料。摘要參賽作品為基于DSP28035的高速永磁無(wú)刷直流電機(jī)驅(qū)動(dòng)系統(tǒng)。該系統(tǒng)以一臺(tái)額定轉(zhuǎn)速60 krpm的高速永磁無(wú)刷直流電機(jī)、交錯(cuò)并聯(lián)的Buck電路以及全橋電路為硬件平臺(tái)，以DSP28035為控制核心，實(shí)現(xiàn)了調(diào)壓調(diào)速功能和基于坐標(biāo)變換的無(wú)位置傳感器新技術(shù)。為實(shí)現(xiàn)該系統(tǒng)要求，本作品充分利用了DSP28035的資源例如：CLA模塊，模擬比較器、HPWM模塊以及AD轉(zhuǎn)換模塊等。AbstractThis work is the drive system for a high speed permanent magnet burshless dc motor based on DSP28035. The hardware platform consists of a BLDC motor(rated speed is 60000rpm), a Buck circuit and an inverter. Under the control of DSP28035, this system can achieve the goal of adjusting the motor’s speed with voltage and the function of sensorless control based on the coordinate transformation. By making full use of resources of the core, such as CLA, analog comparator, HPWM and AD converters, the whole system can meet the requirements.1 引言高速永磁無(wú)刷直流電機(jī)驅(qū)動(dòng)系統(tǒng)由于基波頻率較高（一般在1kHZ以上），利用逆變橋斬波進(jìn)行調(diào)速的控制方式通常會(huì)受到開(kāi)關(guān)管開(kāi)關(guān)頻率的限制，因此該系統(tǒng)多采用三相全橋前級(jí)加Buck電路進(jìn)承擔(dān)調(diào)壓調(diào)速的功能，而三相全橋主要承擔(dān)邏輯換相的功能。然而，傳統(tǒng)Buck電路所需電感的體積較大，增加了系統(tǒng)的體積，降低了系統(tǒng)的功率密度。
上傳時(shí)間： 2022-05-08
上傳用戶：bluedrops
fpga based jpge 壓縮算法，性能不錯(cuò)
上傳時(shí)間： 2022-06-24
上傳用戶：
Platform Builder 6.0 是以VS2005的插件形式安裝集成的。 Platform Builder正版是需要向微軟或者其代理機(jī)構(gòu)購(gòu)買的，官方只有評(píng)估版本的下載。
標(biāo)簽： 五金手冊(cè)
上傳時(shí)間： 2013-06-01
上傳用戶：eeworm
便攜式B型超聲診斷儀具有無(wú)創(chuàng)傷、簡(jiǎn)便易行、相對(duì)價(jià)廉等優(yōu)勢(shì)，在臨床中越來(lái)越得到廣泛的應(yīng)用。它將超聲波技術(shù)、微電子技術(shù)、計(jì)算機(jī)技術(shù)、機(jī)械設(shè)計(jì)與制造及生物醫(yī)學(xué)工程等技術(shù)融合在一起。開(kāi)展該課題的研究對(duì)提高臨床診斷能力和促進(jìn)我國(guó)醫(yī)療事業(yè)的發(fā)展具有重要的意義。 便攜式B型超聲診斷儀由人機(jī)交互系統(tǒng)、探頭、成像系統(tǒng)、顯示系統(tǒng)構(gòu)成。其基本工作過(guò)程是：首先人機(jī)交互系統(tǒng)接收到用戶通過(guò)鍵盤或鼠標(biāo)發(fā)出的命令，然后成像系統(tǒng)根據(jù)命令控制探頭發(fā)射超聲波，并對(duì)回波信號(hào)處理、合成圖像，最后通過(guò)顯示系統(tǒng)完成圖像的顯示。 成像系統(tǒng)作為便攜式B型超聲診斷儀的核心對(duì)圖像質(zhì)量有決定性影響，但以前研制的便攜式B型超聲診斷儀的成像系統(tǒng)在三個(gè)方面存在不足：第一、采用的是單片機(jī)控制步進(jìn)電機(jī)，控制精度不高，導(dǎo)致成像系統(tǒng)采樣不精確；第二、采用的數(shù)字掃描變換算法太粗糙，影響超聲圖像的分辨率；第三、它的CPU多采用的是51系列單片機(jī)，測(cè)量速度太慢，同時(shí)也不便于系統(tǒng)升級(jí)和擴(kuò)展。 針對(duì)以上不足，提出了基于FPGA的B型超聲成像系統(tǒng)解決方案，采用Altera公司的EP2C5Q208C8芯片實(shí)現(xiàn)了步進(jìn)電機(jī)步距角的細(xì)分，使電機(jī)旋轉(zhuǎn)更勻速，提高了采樣精度；提出并采用DSTI-ULA算法（Uniform Ladder Algorithm based on Double Sample and Trilinear Interotation）在FPGA內(nèi)實(shí)現(xiàn)數(shù)字掃描變換，提高了圖像分辨率；人機(jī)交互系統(tǒng)采用S3C2410-AL作為CPU，改善了測(cè)量速度和系統(tǒng)的擴(kuò)展性。 通過(guò)對(duì)系統(tǒng)硬件電路的設(shè)計(jì)、制作，軟件的編寫(xiě)、調(diào)試，結(jié)果表明，本文所設(shè)計(jì)的便攜式B型超聲成像系統(tǒng)圖像分辨率高、測(cè)量速度快、體積小、操作方便。本文所設(shè)計(jì)的便攜式B型超聲診斷儀可在野外作業(yè)和搶險(xiǎn)（諸如地震、抗洪）中發(fā)揮作用，同時(shí)也可在鄉(xiāng)村診所中完成對(duì)相關(guān)疾病的診斷工作。
上傳時(shí)間： 2013-05-18
上傳用戶：helmos
H.264/AVC是國(guó)際電信聯(lián)盟與國(guó)際標(biāo)準(zhǔn)化組織/國(guó)際電工委員會(huì)聯(lián)合推出的活動(dòng)圖像編碼標(biāo)準(zhǔn)，簡(jiǎn)稱H.264。作為最新的國(guó)際視頻編碼標(biāo)準(zhǔn)，H.264/AVC與MPEG-4、H.263等視頻編碼標(biāo)準(zhǔn)相比，性能有了很大的提高，并已在流媒體、數(shù)字電視、電話會(huì)議、視頻存儲(chǔ)等諸多領(lǐng)域得到廣泛的應(yīng)用。 本論文的研究課題是基于H.264/AVC視頻編碼標(biāo)準(zhǔn)的CAVLC(Context-based Adaptive Variable Length Coding，基于上下文的自適應(yīng)可變長(zhǎng)編碼)編碼算法研究及FPGA實(shí)現(xiàn)。對(duì)于變換后的熵編碼，H.264/AVC支持兩種編碼模式：基于上下文的可變長(zhǎng)編碼(CAVLC)和基于上下文的自適應(yīng)算術(shù)編碼(CABAC，Context-based Adaptive BinaryArithmetic Coding)。在H.264/AVC中，盡管CAVLC算法也是采用了VLC編碼，但是同以往標(biāo)準(zhǔn)不同，它所有的編碼都是基于上下文進(jìn)行。這種方法比傳統(tǒng)的查單一表的方法提高了編碼效率，但也增加了設(shè)計(jì)上的困難。 作者在全面學(xué)習(xí)H.264/AVC協(xié)議和深入研究CAVLC編碼算法的基礎(chǔ)上，確定了并行編碼的CAVLC編碼器結(jié)構(gòu)框圖，并總結(jié)出了影響CAVLC編碼器實(shí)現(xiàn)的瓶頸。針對(duì)這些瓶頸，對(duì)CAVLC編碼器中的各個(gè)功能模塊進(jìn)行了優(yōu)化設(shè)計(jì)，這些優(yōu)化設(shè)計(jì)包括多參考?jí)K的表格預(yù)測(cè)法、快速查找表法、算術(shù)消除法等。最后，用Verilog硬件描述語(yǔ)言對(duì)所設(shè)計(jì)的CAVLC編碼器進(jìn)行了描述，用EDA軟件對(duì)其主要功能模塊進(jìn)行了仿真，并在Cyclone II系列EP2C20F484的FPGA上驗(yàn)證了它們的功能。結(jié)果表明，該CAVLC編碼器各編碼單元的編碼速度得到了顯著提高且均能滿足實(shí)時(shí)通信要求，為整個(gè)CAVLC編碼器的實(shí)時(shí)通信提供了良好的基礎(chǔ)。
上傳時(shí)間： 2013-06-22
上傳用戶：diamondsGQ
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