Since the advent of optical communications, a great technological effort has been devoted to the exploitation of the huge bandwidth of optical fibers. Start- ing from a few Mb/s single channel systems, a fast and constant technological development has led to the Actual 10 Gb/s per channel dense wavelength di- vision multiplexing (DWDM) systems, with dozens of channels on a single fiber. Transmitters and receivers are now ready for 40 Gb/s, whereas hundreds of channels can be simultaneously amplified by optical amplifiers.
標(biāo)簽： Communication Techniques Optical Theory and
上傳時(shí)間： 2020-05-31
上傳用戶：shancjb
The following sections profile many of the vendors in the NFV market. The individual profiles were created through a collaborative effort between SDNCentral’s Research Team and the Vendor’s product experts. SDNCentral worked under the assumption the information provided by the vendors was fActual, auditing the submissions only to remove unverifiable claims and hyperbole. Extended profiles can be viewed online. While every attempt has been made to validate the capabilities listed in the profiles, SDNCentral advises end users to verify the veracity of each claim for themselves in their Actual deployment environments. SDNCentral cannot be held liable for unexpected operations, damages or incorrect operation due to any inaccuracies listed here. SDNCentral welcomes feedback and additional information from end users based on their real-world experiences with the products and technologies listed. The SDNCentral research team can be reached at
標(biāo)簽： SDxCentral-Mega-NFV-Report
上傳時(shí)間： 2020-06-01
上傳用戶：shancjb
Recent years have seen a rapid development of neural network control tech- niques and their successful applications. Numerous simulation studies and Actual industrial implementations show that artificial neural network is a good candidate for function approximation and control system design in solving the control problems of complex nonlinear systems in the presence of different kinds of uncertainties. Many control approaches/methods, reporting inventions and control applications within the fields of adaptive control, neural control and fuzzy systems, have been published in various books, journals and conference proceedings.
標(biāo)簽： Stable_adaptive_neural_network_co ntrol
上傳時(shí)間： 2020-06-10
上傳用戶：shancjb
Wherever possible the overall technique used for this series will be "definition by example" withgeneric formulae included for use in other applications. To make stability analysis easy we will usemore than one tool from our toolbox with data sheet information, tricks, rules-of-thumb, SPICESimulation, and real-world testing all accelerating our design of stable operational amplifier (op amp)circuits. These tools are specifically targeted at voltage feedback op amps with unity-gain bandwidths<20 MHz, although many of the techniques are applicable to any voltage feedback op amp. 20 MHz ischosen because as we increase to higher bandwidth circuits there are other major factors in closing theloop: such as parasitic capacitances on PCBs, parasitic inductances in capacitors, parasitic inductancesand capacitances in resistors, etc. Most of the rules-of-thumb and techniques were developed not justfrom theory but from the Actual building of real-world circuits with op amps <20 MHz.
標(biāo)簽： 運(yùn)算放大器
上傳時(shí)間： 2021-11-01
上傳用戶：
針對(duì)嵌入式產(chǎn)品程序更新問(wèn)題,提出了一種基于IAP技術(shù)的STM32單片機(jī)在線固件升級(jí)方案,設(shè)計(jì)了STM32單片機(jī)最小系統(tǒng)硬件電路和USB轉(zhuǎn)串口通信電路,并給出了Bootloader程序、APP程序、PC上機(jī)程序的實(shí)現(xiàn)流程.實(shí)驗(yàn)結(jié)果表明,該方案具有簡(jiǎn)單實(shí)用、穩(wěn)定性高、維護(hù)成本低和設(shè)備使用效率高的特點(diǎn),適用于嵌入式產(chǎn)品升級(jí).For the problem of updating embedded products program,an online firmware upgrade scheme of STM32 single chip microcomputer based on IAP technology is proposed.This scheme not only elaborates the principle of IAP technology in detail but also provides the design of the minimum system hardware circuit of STM32 MCU,the design of USB for serial communication circuit,and the implementation flow of Bootloader program,APP program and PC program.The experiment results show that the scheme is simple,practical and highly stable.In addition,it can be used to Actual embedded product upgrading,significantly reducing maintenance costs and improving the efficiency of equipment.
上傳時(shí)間： 2022-03-25
上傳用戶：
設(shè)計(jì)了農(nóng)業(yè)溫濕度智能控制系統(tǒng),該系統(tǒng)采用DHT11溫濕度傳感器作為溫濕度采集模塊,單片機(jī)選用AT89C52代替并調(diào)用Virtual terminal模擬串口通信,LCD1604液晶顯示器實(shí)時(shí)顯示溫濕度,實(shí)現(xiàn)了溫濕度的測(cè)量、顯示,可自動(dòng)控制加熱、降溫、加濕、通風(fēng),實(shí)現(xiàn)溫濕度控制以及超限報(bào)警處理,并利用Proteus與Keil進(jìn)行實(shí)際電路的仿真。試驗(yàn)表明,該系統(tǒng)實(shí)現(xiàn)了可靠的溫濕度監(jiān)控。We described the design of an intelligent control system of agriculture temperature and humidity.The system uses DHT11 temperature and humidity sensor as the temperature and humidity acquisition module.The SCM adopts AT89C52 to replace and call the virtual terminal for simulating serial communication.LCD1604 displays temperature and humidity in real time,which implements the measurement and display of temperature and humidity.The system is able to automatically control heating,cooling,humidification and ventilation,to achieve temperature and humidity control and over-limit alarm processing.The system also uses Proteus and Keil for Actual circuit simulation.The experiment shows that the system is capable of reliable temperature and humidity monitoring.
標(biāo)簽： at89c52 溫濕度智能控制系統(tǒng)
上傳時(shí)間： 2022-03-26
上傳用戶：aben
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(guò)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：
在半導(dǎo)體制冷技術(shù)的工作性能及其優(yōu)缺點(diǎn)研究的基礎(chǔ)上,設(shè)計(jì)了以單片機(jī)為核心控制元件,以TEC1-12706為執(zhí)行元件的半導(dǎo)體制冷溫度控制系統(tǒng)。采用高精度分段式PID控制算法配合PWM輸出控制的方法實(shí)現(xiàn)溫度控制;選擇數(shù)字傳感器DS18B20為溫度檢測(cè)元件,還包含1602液晶顯示模塊、按鍵調(diào)整輸入模塊和H橋驅(qū)動(dòng)模塊等。實(shí)際測(cè)試表明,該系統(tǒng)結(jié)構(gòu)簡(jiǎn)單易行,操作方便,工作性能優(yōu)良,同時(shí)針對(duì)該系統(tǒng)專門(mén)設(shè)計(jì)的溫控算法,使半導(dǎo)體制冷器能更好地適應(yīng)不同工況而充分發(fā)揮其制冷制熱工作特性。Based on the study of the performance and advantages and disadvantages of thermoelectric cooler(TEC)technology,a thermoelectric cooling temperature control system with single-chip microcomputer as the core control element and TEC1-12706 as the executive element was designed. High precision piecewise PID control algorithm combined with PWM output control method is adopted to realize temperature control. The digital sensor DS18B20 is selected as the temperature detection element. It also includes 1602 LCD module,key adjustment input module and H bridge drive module. The Actual test shows that the system has simple structure,convenient operation and excellent performance. Meanwhile,the temperature control algorithm specially designed for the system can make the semiconductor cooler better adapt to different working conditions and give full play to its refrigeration and heating characteristics.
標(biāo)簽： 半導(dǎo)體 溫度控制系統(tǒng)
上傳時(shí)間： 2022-03-27
上傳用戶：
ABB機(jī)器人編程手冊(cè).pdfAliasIO is used to define a signal of any type with an alias name or to use signals in builtin task modules. Signals with alias names can be used for predefined generic programs, without any modification of the program before running in different robot installations. The instruction AliasIO must be run before any use of the Actual signal. See Basic examples on page 21 for loaded modules, and More examples on page 22 for installed modules.
上傳時(shí)間： 2022-03-28
上傳用戶：kingwide
應(yīng)用無(wú)跡卡爾曼濾波算法（UKF）進(jìn)行鋰電池的SOC估計(jì),采用Thevenin二階RC等效電路模型,對(duì)HPPC電池脈沖充放電實(shí)驗(yàn)數(shù)據(jù)進(jìn)行Matlab處理,得到較為準(zhǔn)確的模型.通過(guò)在Matlab中編寫(xiě)算法程序,對(duì)不同工況的估計(jì)值與實(shí)際值進(jìn)行誤差估算及對(duì)比分析,通過(guò)此算法進(jìn)行SOC估計(jì),得到該算法可有效降低系統(tǒng)誤差并糾正SOC的初值偏差.The non trace Calman filter （UKF） is applied to the SOC estimation of lithium battery. The Thevenin two order RC equivalent circuit model is used to process the HPPC battery pulse charge discharge experimental data by Matlab processing, and a more accurate model is obtained. By writing algorithm program in Matlab, the error estimation and comparison analysis of the estimated value and Actual value of different states are carried out, and the SOC estimation is carried out by this algorithm. The algorithm can effectively reduce the system error and correct the initial value deviation of the SOC.
標(biāo)簽： 卡爾曼濾波
上傳時(shí)間： 2022-05-03
上傳用戶：默默
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