<strike id="aw8gq"></strike>
RFID (radio-frequency identification) is the use of a wireless non-contact system that uses radio-frequencyelectromagnetic fields to transfer datafrom a tag attached to an object, for the purposes of automatic identification and tracking [38]. The basic technologies for RFID have been around for a long time. Its root can be traced back to an espionage device designed in 1945 by Leon Theremin of the Soviet Union,whichretransmittedincidentradiowaves modulatedwith audioinformation. After decades of development, RFID systems have gain more and more attention from both the research community and the industry.
標(biāo)簽： Infrastructure RFID as an
上傳時(shí)間： 2020-06-08
上傳用戶：shancjb
I wrote this book so that students, hobbyists, and engineers alike can take advantage of the Arduino platform by creating several projects that will teach them about the engineering process. I also wanted to guide the reader through introductory projects so that they could get a firm grasp on the Arduino Language, and how to incorporate several pieces of hardware to make their own projects. This book offers so much information on the Arduino, not just the basic LED projects but it offers different peripherals such as Ultrasonic sensor, the Xbox? controller, Bluetooth, and much more. This book also teaches the non-engineer to follow a process that will help them in future project (not just Arduino projects).
標(biāo)簽： Engineering Practical Arduino
上傳時(shí)間： 2020-06-09
上傳用戶：shancjb
The main aim of this book is to present a unified, systematic description of basic and advanced problems, methods and algorithms of the modern con- trol theory considered as a foundation for the design of computer control and management systems. The scope of the book differs considerably from the topics of classical traditional control theory mainly oriented to the needs of automatic control of technical devices and technological proc- esses. Taking into account a variety of new applications, the book presents a compact and uniform description containing traditional analysis and op- timization problems for control systems as well as control problems with non-probabilistic models of uncertainty, problems of learning, intelligent, knowledge-based and operation systems – important for applications in the control of manufacturing processes, in the project management and in the control of computer systems.
標(biāo)簽： Modern_Control_Theory
上傳時(shí)間： 2020-06-10
上傳用戶：shancjb
The PW5300 is a current mode boost DC-DC converter. Its PWM circuitry with built-in 0.2? powerMOSFET make this regulator highly power efficient. The internal compensation network alsominimizes as much as 6 external component counts. The non-inverting input of error amplifierconnects to a 0.6V precision reference voltage and internal soft-start function can reduce the inrushcurrent. The PW5300 is available in the SOT23-6L package and provides space-saving PCB for theapplication fields
標(biāo)簽： pw5300
上傳時(shí)間： 2022-02-11
上傳用戶：jiabin
解讀 5G 八大關(guān)鍵技術(shù) 【摘要】5G 不是一次革命，5G 是 4G 的延續(xù)，我相信 5G 在核心網(wǎng)部分不會(huì)有太 大的變動(dòng)，5G 的關(guān)鍵技術(shù)集中在無(wú)線部分。 在進(jìn)入主題之前，我覺得首先應(yīng)該弄清楚一個(gè)問題：為什么需要 5G？不是因 為通信工程師們突然想改變世界，而炮制了一個(gè) 5G。是因?yàn)橄扔辛诵枨螅庞辛?5G。什么需求？ 未來(lái)的網(wǎng)絡(luò)將會(huì)面對(duì)：1000 倍的數(shù)據(jù)容量增長(zhǎng)，10 到 100 倍的無(wú)線設(shè)備連接， 10 到 100 倍的用戶速率需求，10 倍長(zhǎng)的電池續(xù)航時(shí)間需求等等。坦白的講，4G 網(wǎng)絡(luò)無(wú)法滿足這些需求，所以 5G 就必須登場(chǎng)。 但是，5G 不是一次革命。5G 是 4G 的延續(xù)，我相信 5G 在核心網(wǎng)部分不會(huì)有 太大的變動(dòng)，5G 的關(guān)鍵技術(shù)集中在無(wú)線部分。雖然 5G 最終將采用何種技術(shù)，目前 還沒有定論。不過，綜合各大高端論壇討論的焦點(diǎn)，我今天收集了 8 大關(guān)鍵技術(shù)。 當(dāng)然，應(yīng)該遠(yuǎn)不止這些。 1.非正交多址接入技術(shù) （Non-Orthogonal Multiple Access,NOMA） 我們知道 3G 采用直接序列碼分多址（Direct Sequence CDMA ，DS-CDMA） 技術(shù)，手機(jī)接收端使用 Rake 接收器，由于其非正交特性，就得使用快速功率控制 （Fast transmission power control ，TPC)來(lái)解決手機(jī)和小區(qū)之間的遠(yuǎn)-近問題。 而 4G 網(wǎng)絡(luò)則采用正交頻分多址（
標(biāo)簽： 5G
上傳時(shí)間： 2022-02-25
上傳用戶：20125101110
mosfet并聯(lián)使用介紹了并聯(lián)使用的注意事項(xiàng)，特別注意避開Vgsth zero thermal coefficient以下的正溫特性設(shè)計(jì)
上傳時(shí)間： 2022-03-01
上傳用戶：bluedrops
華為AI安全白皮書2018-cn近年來(lái)，隨著海量數(shù)據(jù)的積累、計(jì)算能力的發(fā)展、機(jī)器學(xué)習(xí)方法與系統(tǒng)的持續(xù)創(chuàng)新與演進(jìn)，諸如圖像識(shí)別、語(yǔ)音識(shí) 別、自然語(yǔ)言翻譯等人工智能技術(shù)得到普遍部署和廣泛應(yīng)用。越來(lái)越多公司都將增大在AI的投入，將其作為業(yè)務(wù)發(fā)展 的重心。華為全球產(chǎn)業(yè)愿景預(yù)測(cè)：到2025年，全球?qū)?shí)現(xiàn)1000億聯(lián)接，覆蓋77%的人口；85%的企業(yè)應(yīng)用將部署到 云上；智能家庭機(jī)器人將進(jìn)入12%的家庭，形成千億美元的市場(chǎng)。 人工智能技術(shù)的發(fā)展和廣泛的商業(yè)應(yīng)用充分預(yù)示著一個(gè)萬(wàn)物智能的社會(huì)正在快速到來(lái)。1956年，麥卡錫、明斯基、 香農(nóng)等人提出“人工智能”概念。60年后的今天，伴隨著谷歌DeepMind開發(fā)的圍棋程序AlphaGo戰(zhàn)勝人類圍棋冠 軍，人工智能技術(shù)開始全面爆發(fā)。如今，芯片和傳感器的發(fā)展使“+智能”成為大勢(shì)所趨：交通+智能，最懂你的 路；醫(yī)療+智能，最懂你的痛；制造+智能，最懂你所需。加州大學(xué)伯克利分校的學(xué)者們認(rèn)為人工智能在過去二十年 快速崛起主要?dú)w結(jié)于如下三點(diǎn)原因[1]：1）海量數(shù)據(jù)：隨著互聯(lián)網(wǎng)的興起，數(shù)據(jù)以語(yǔ)音、視頻和文字等形式快速增 長(zhǎng)；海量數(shù)據(jù)為機(jī)器學(xué)習(xí)算法提供了充足的營(yíng)養(yǎng)，促使人工智能技術(shù)快速發(fā)展。2）高擴(kuò)展計(jì)算機(jī)和軟件系統(tǒng)：近 年來(lái)深度學(xué)習(xí)成功主要?dú)w功于新一波的CPU集群、GPU和TPU等專用硬件和相關(guān)的軟件平臺(tái)。3）已有資源的可獲得 性：大量的開源軟件協(xié)助處理數(shù)據(jù)和支持AI相關(guān)工作，節(jié)省了大量的開發(fā)時(shí)間和費(fèi)用；同時(shí)許多云服務(wù)為開發(fā)者提供 了隨時(shí)可獲取的計(jì)算和存儲(chǔ)資源。 在機(jī)器人、虛擬助手、自動(dòng)駕駛、智能交通、智能制造、智慧城市等各個(gè)行業(yè)，人工智能正朝著歷史性時(shí)刻邁進(jìn)。谷 歌、微軟、亞馬遜等大公司紛紛將AI作為引領(lǐng)未來(lái)的核心發(fā)展戰(zhàn)略。2017年谷歌DeepMind升級(jí)版的AlphaGo Zero橫 空出世；它不再需要人類棋譜數(shù)據(jù)，而是進(jìn)行自我博弈，經(jīng)過短短3天的自我訓(xùn)練就強(qiáng)勢(shì)打敗了AlphaGo。AlphaGo Zero能夠發(fā)現(xiàn)新知識(shí)并發(fā)展出打破常規(guī)的新策略，讓我們看到了利用人工智能技術(shù)改變?nèi)祟惷\(yùn)的巨大潛能。 我們現(xiàn)在看到的只是一個(gè)開始；未來(lái)，將會(huì)是一個(gè)全聯(lián)接、超智能的世界。人工智能將為人們帶來(lái)極致的體驗(yàn)，將 積極影響人們的工作和生活，帶來(lái)經(jīng)濟(jì)的繁榮與發(fā)展。
上傳時(shí)間： 2022-03-06
上傳用戶：
隨著光伏發(fā)電系統(tǒng)快速發(fā)展,以及電動(dòng)汽車充電樁的普及,傳統(tǒng)的剩余電流保護(hù)器無(wú)法滿足實(shí)際需求。介紹了一款B型剩余電流保護(hù)器,采用磁調(diào)制剩余電流互感器和零序電流互感器采集剩余電流。根據(jù)GB/T 22794—2017標(biāo)準(zhǔn)要求,可識(shí)別1 kHz及以下的正弦交流、帶和不帶直流分量的脈動(dòng)直流、平滑直流等剩余電流信號(hào)。經(jīng)信號(hào)調(diào)理電路將電壓信號(hào)送到單片機(jī)進(jìn)行采集和判斷。通過試驗(yàn)測(cè)試,該樣機(jī)在測(cè)試精度和速度上均符合國(guó)家標(biāo)準(zhǔn)的相關(guān)要求。The rapid development of photovoltaic power generation systems and the popularity of electric vehicle charging piles make the traditional residual current protective devices unable to meet the actual demand.This paper proposed a type B residual current protective device,which uses the magnetically modulated residual current transformer and the zero sequence current transformer to acquire the residual current.According to the requirements of GB/T 22794—2017,the type B residual current protective device can detect sinusoidal AC residual current of 1kHz and below 1kHz,pulsating DC residual current with and without DC component,smooth DC residual current and so on.The signal processing circuit sends the voltage signal to the MCU for acquisition and judgment.Through experimental tests,the device meets the relevant requirements of national standards in terms of test accuracy and speed.
標(biāo)簽： 電流保護(hù)器
上傳時(shí)間： 2022-03-27
上傳用戶：
溫度控制如今已成為當(dāng)代社會(huì)研究的熱點(diǎn)之一,而溫度檢測(cè)在現(xiàn)代設(shè)備參數(shù)檢測(cè)中也是一項(xiàng)極其重要的技術(shù),應(yīng)用十分廣泛。與傳統(tǒng)的測(cè)溫方法相比,紅外測(cè)溫方法具有時(shí)間短、精度高、使用簡(jiǎn)單方便等優(yōu)點(diǎn)。本文以環(huán)境溫度為被測(cè)對(duì)象,設(shè)計(jì)了以STC89C52單片機(jī)為控制中心的紅外測(cè)溫裝置,能夠?qū)崿F(xiàn)對(duì)目標(biāo)溫度的實(shí)時(shí)采集、處理、顯示和報(bào)警等功能。本設(shè)計(jì)主要是由STC89C52單片機(jī)、紅外測(cè)溫傳感器、LCD1602液晶顯示器、按鍵和蜂鳴器等部分組成,采用非接觸的方式對(duì)目標(biāo)溫度進(jìn)行實(shí)時(shí)檢測(cè)。Temperature control has become one of the hotspots in contemporary social research,and temperature detection is an extremely important technology in modern equipment parameter detection.Compared with traditional method,the infrared temperature measuring method has advantages of short time,high precision and convenient operation,etc.This paper consider environment temperature as research objects and designs an infrared temperature measuring device which employs the STC89C52singlechipas-control center,and it can realize timely collection,processing,display and alarm function of the target temperature.The design is mainly composed of STC89C52 singlechip,infrared temperature sensor,LCD1602monitor,keys and buzzer,etc.This design detects the target temperature by non-contact method.
上傳時(shí)間： 2022-03-27
上傳用戶：jiabin
本系統(tǒng)基于STM32單片機(jī)設(shè)計(jì)的非接觸式電流檢測(cè)控制系統(tǒng),通過OPA548片將所給任意信號(hào)放大,由100Ω電阻和INA128芯片進(jìn)行電流電壓轉(zhuǎn)換放大后,利用STM32單片機(jī)對(duì)獲取的電壓信號(hào)以0.488μs頻率采樣,利用STM32單片機(jī)的FFT庫(kù),獲得信號(hào)的諧波信息。測(cè)量電流信號(hào)精準(zhǔn),該設(shè)計(jì)可廣泛應(yīng)用在以STM32單片機(jī)為核心控制器件的新型儀表中,性能精準(zhǔn)且抗干擾能力強(qiáng)。This system is a non-contact current detection and control system based on STM32 single chip microcomputer. It amplifiesany signal through OPA548 chip, converts and amplifies the current and voltage by 100 Ω resistance and INA128 chip. The obtainedvoltage signal is sampled at the frequency of 0.488 μs by STM 32 single chip microcomputer, and the harmonic information of the signalis obtained by the FFT library of STM 32 single chip microcomputer. The measurement of current signal is accurate. This design can bewidely used in a new instrument with STM 32 single chip microcomputer as its core control device, with accurate performance and stronganti-interference capability.
上傳時(shí)間： 2022-03-27
上傳用戶：
蟲蟲下載站版權(quán)所有 京ICP備2021023401號(hào)-1
