Today, electric power transmission systems should face many demanding chal- lenges, which include balancing between reliability, economics, environmental, and other social objectives to optimize the grid assets and satisfy the growing electrical demand. Moreover, the operational environment of transmission systems is becoming increasingly rigorous due to continually evolving functions of interconnected power networks from operation jurisdiction to control responsibly – coupled with the rising demand and expectation for reliability.
标签： Monitoring Protection Wide Area
上传时间： 2020-06-07
上传用户：shancjb
Sensors are points ofcontact betweenthe material world ofatoms, mass, andenergy and the seemingly immaterial world of information, computation, and cognition. Linking these two domains more tightly yields all sorts of practical benefits, such as improvedinputdevicesforcomputers,moreeffectivemedicaldevices(implantedor worn), more precise agricultural operations, better monitored buildings or bridges, more secure payment systems, and more reliable sensor–actuator control systems. There are many settings in which tighter coupling between digital and physical planes can enhance safety, security, performance, and reliability.
标签： Computational RFID
上传时间： 2020-06-08
上传用户：shancjb
Radio frequency identification (RFID) is a type of automatic identification systems which has gained popularity in recent years for being fast and reliable in keeping track of the individual objects. In RFID systems, contactless object identification is achieved using radio signals without the need for physical contact as the case with other existing identification technologies such as barcodes. Therefore, a huge number of items can be identified in a short amount of time with high reliability and low cost which makes the RFID technology very attractive for a wide range of applications such as supply chain management, e-health, monitoring humans, pets, animals, and many other objects, toll control, and electrical tagging. Furthermore, RFID technology eliminates the human error and reduces the total cost of the products.
上传时间： 2020-06-08
上传用户：shancjb
Extensively rewritten to present the C++11 language, standard library, and key design techniques as an integrated whole, Stroustrup thoroughly addresses changes that make C++11 feel like a whole new language, offering definitive guidance for leveraging its improvements in performance, reliability, and clarity. C++ programmers around the world recognize Bjarne Stoustrup as the go-to expert for the absolutely authoritative and exceptionally useful information they need to write outstanding C++ programs. Now, as C++11 compilers arrive and development organizations migrate to the new standard, they know exactly where to turn once more: Stoustrup's C++ Programming Language, Fourth Edition.Bjarne Stroustrup是C++的设计师和最早的实现者，也是《C++程序设计语言》、《带标注的C++参考手册》和《C++语言的设计与演化》的作者。他从丹麦Aarhus大学和英国牛津大学毕业，现在是AT&T大规模程序设计研究部的负责人，AT&T特别成员，AT&T贝尔实验室特别成员，以及ACM特别成员。Stroustrup的研究兴趣包括分布式系统、操作系统、模拟、设计和程序设计。他也是Addison·Wesley的C++In-Depth系列书籍的编辑。
标签： C++
上传时间： 2022-02-01
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The PW8205A8TS is the highest performance trench N-ch MOSFETs with extreme high cell density,which provide excellent RDSON and gate charge for most of the small power switching and loadswitch applications. The meet the RoHS and Product requirement with full function reliabilityapproved .
标签： 8205a8
上传时间： 2022-02-14
上传用户：wangshoupeng199
超声波测距在智能机器人中的开发与应用摘 要：本文提出了在机器人控制中，使用软件方法实现超声波测距机器人避障功能的工作原理和设计 方法。该系统在使用过程中，测量精度高，机器人避障准确，可靠，真正实现了智能化控制。 关键词：机器人 超声波 测距 软件触发 Abstract： The 0n pnnc eanddesignm d10d ofu]U~ sordc are descx'~edindetail fora intenigencero~ ic ． ByI|8i“gthissystem，therobotmakesaccta~elyavoidingdmwhackhi# reliability． 1畸 wo阿s：ro tultro-sor~c聊 曲 喀sot~aretrigger 1 引言 在智能机器人的研制开发中，很重要 的一部 分就是机器人 要能实现避 障功能 ，即通过传感器 的作用 ，探测机器人行进道路 上是否碰到障碍。 若碰到了障碍 ，机器人应该 自动转向 ，躲避障碍 。 本文所介 绍的超声 波测距方法 ，应用 于 ET一18 Hem智能机器人中。通过超声波测距 ，该智能机 器人实现了对步进电动机的智能控制及运动控制 方式的灵活应用。同时，超声波测距作为一种非 接触 的检测方式 ，和红外 、激光及无线电测距相 比，在近距范 围内有不受光线影响、结构简单 、成 本低等优点 2 超声波测距基本原理 超声波是指频率在 2000Hz以上 ，不能引起正 常人听觉反应 的机械振动波 ，是物体 的机械振 动 在弹性介质 中传播所形成 的机械振动波。由于超 声波具有非常短 的波长 ，可 以聚集成狭小 的发
上传时间： 2022-02-16
上传用户：jiabin
以AT89S52单片机为控制核心,采用电容降压技术,Buck电路拓扑,PWM驱动模块和功率器件散热设计,通过高速的数据采集、主功率输入输出模块和控制模块,设计一种新型智能车载充电器.在充电过程中,通过负脉冲瞬间放电实现对铅酸蓄电池的再生修复,提高电池的有效容量,延长使用寿命.该充电器体积小、速度快、效率高、可靠性好.With AT89S52 single chip computer as the control core,a new type of intelligent car-carried charger was designed by using capacitance step-down technology,Buck circuit topology,PWM driving module and power device heat dissipation design,through high-speed data acquisition,main power input and output module and control module.In the charging process,the regeneration and repair of lead-acid batteries are realized by instantaneous discharge of negative pulse,which improves the effective capacity of batteries and prolongs their service life.The charger has the advantages of small size,fast speed,high efficiency and good reliability.
标签： 车载充电器
上传时间： 2022-03-27
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CAN总线是汽车上应用最广泛的车载网络总线,具有实时性强、可靠性高、成本低等优点。鉴于此,介绍了一种利用飞思卡尔系列单片机MC9S12XS128作为控制器,利用其内部的MSCAN模块、CAN收发器TJA1040等外围元件进行CAN总线通信节点设计。该设计能够实现CAN总线数据的发送与接收,可应用于汽车及其他各种CAN总线通信系统。CAN bus is the most widely used on-board network bus in automobiles. It has the advantages of realtime, high reliability and low cost. In view of this,this paper introduces the design of CAN bus communication node by using Freescale MC9S12XS128 as controller,using its internal MSCAN module,CAN transceiver TJA1040 and other peripheral components. This design can realize the sending and receiving of CAN bus data,and can be used in automobile and other CAN bus communication systems.
上传时间： 2022-03-27
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本文首次设计并验证了基于macom三合一芯片设计的光模块电路,该电路旨在提供一种满足SFF-8472中规定的数字诊断功能的低成本SFP+模块。电路采用激光器驱动、限幅放大器、控制器以及时钟恢复单元集成的单芯片,在保证高精度数字诊断功能基础上,实现了低成本高可靠的特点。该电路在光接收接口组件与激光器驱动和限幅放大器单元的限幅放大器部分之间接入滤波器来提高模块的灵敏度及信号质量。在控制器单元的数字电位器的引脚上采用外加电阻的方式避免出现上电不发光的故障问题。该研究结果为下一代SFP-DD光模块设计与开发工作,奠定了一定的理论与实践基础。This paper designs and validates the optical module circuit based on the MACOM Trinity chip for the first time.This circuit aims to provide a low-cost SFP module which meets the digital diagnosis function specified in SFF-8472.The circuit uses a single chip integrated with laser driver,limiting amplifier,controller and clock recovery unit.On the basis of ensuring high precision digital diagnosis function,it achieves the characteristics of low cost and high reliability.The circuit connects a filter between the optical receiving interface module and the limiting amplifier part of the laser driver and limiting amplifier unit to improve the sensitivity and signal quality of the module.The pin of the digital potentiometer in the controller unit is equipped with an external resistance to avoid the problem of power failure.The research results lay a theoretical and practical foundation for optical module design in high-speed data center.
上传时间： 2022-04-03
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针对交流电路过零检测电路存在结构复杂、过零点检测不准确、编程繁琐等问题，设计了一种基于LM339的硬件结构简单的过零检测电路。通过仿真软件Mulisim对该设计电路进行了仿真，实验证明了该方案过零检测的可行性、稳定性和可靠性，可直接作为交流电路中CPU的过零信号。Aiming at the problems of AC cilsuit zero crossing detection circuit such as complex structure, zero crossing detection and cumbersome programming, a zero crossing detection circuit with simple hardware structure based on LM339 was designed. The design circuit was simulated by simulation software Mulisim, and the feasibility, stability and reliability of zero crossing detection were proved by experiments, which can be used as zero crossing signal of CPU in AC circuit directly.
上传时间： 2022-05-03
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