一种新型微机化功率因数补偿器

本文介绍一种用8098单片机控制的功率因数补偿器。该功率因数补偿器具有相负载分别补偿，补偿电容在电压过零时投切，各相功率因数和电流值分时显示等特点。     

基于单片机的新型异步电机节能控制器研究

介绍了基于MCS-96单片机的节能控制器的研究和试验情况.单片机记录电压、电流的过零点,计算出实际功率因数角,并与设定的最佳功率因数角比较,及时输出触发脉冲,实时调整电机的功率因数,达到节能的目的.试验证明,在空载轻载时有较好的节能效果.     

一种新的功率因数补偿算法及实现

根据电路理论推导出的一种功率因数补偿算法，并用单片机具体实现，具有算法新颖、电路简单、运行可靠的特点。     

功率因数自动补偿控制器的研究

一种以8031单片机为核心构成的功率因数自动补偿控制器的工作原理、硬件电路及软件设计.     

同步电动机励磁电流调节与电网功率因数提高

分析了调节同步电动机励磁装置励磁电流以提高电网功率因数的原理，并介绍了一个基于80C196KC单片机的励磁控制系统及一个应用实例。     

一种数字式功率因数表

本文描述了一种用单片机构成的新型数字式功率因数表。首先介绍了它的基本原理，然后，较详细地介绍了它的硬件及软件构成。由于它具有数字式仪表的各种优点，可望得到广泛的应用。     

基于单片机的功率因数补偿控制器硬件的研究

为了减小电网中感性负载造成的电量损耗,在分析了现有功率因数补偿控制器的补偿效果后,设计了一种通过单片机控制四组电容器组,自动控制投切进行补偿的功率因数补偿控制器。     

电力系统功率因数的自动控制与检测

将８９Ｃ５１单片微机应用于电力系统功率因数自动控制，设计中利用了差动式相敏放大器检测电路和充分合理地使用了８９Ｃ５１单片机片内ＲＡＭ，使电路结构简单，抗干扰性强     

基于单片机的交流电路功率因数自动测量技术

随着国民经济的发展,微机测控技术已经渗透到各行各业的各个领域。采用单片机技术对电机参数进行高精度测量,既可以改变传统的测量方法,同时又能实现电机运行参数的在线检测,对提高电机的运行,改善其性能可以起到一定的作用。本文就介绍了一种以单片机为核心的交流功率因数自动测量方法,阐述了本测量方法的硬件电路和软件系统,并通过实验证明了其具有准确性和实用性。本测量技术的主要特点是简单、可靠、精确度较高,并可以实现负载特性的判断,经过验证,可以在电机交流电路中广泛推广应用。     

单片机控制的同步电动机励磁系统研制

在分析同步电动机功率因数原理的基础上,提出了以恒功率因数为控制目标提高电网功率因数的方案,设计了以恒功率因数为控制目标对励磁电流调节的同步电动机励磁装置,详细讨论了基于W77E85单片机的励磁控制系统的软、硬件设计。实验表明该方案可行有效。     

Error in the UNITY substitution rule for subscripted operators

UNITY, introduced by Chandy and Misra [ChM88], is a programming logic intended to reason about temporal properties of distributed programs. Despite the fact that UNITY does not have the full power of, for example, linear temporal logic, it enjoys popularity due to its simplicity.There was however a serious problem with the Substitution Rule. The logic is incomplete without the rule, and with the rule it is inconsistent.     

Solution of optimal control problem of linear system with input derivative through Liapunov's method

Decentralized stabilization and control schemes for large-scale power systems are presented in this paper. The interconnections between the subsystems are assumed to be unknown, but bounded. The control design for the first scheme utilizes the knowledge of the bounds on the interconnections between the subsystems, whereas this information is not required in the second control design due to its adaptive nature. These schemes are applied to a power system with two generators and an infinite bus connected through a network of transformers and transmission lines. Simulation studies for unknown interconnections arising due to faults and subsequent line switchings in the transmission network are carried out. The studies not only illustrate the simplicity of the developed controls, but also validate the fact that connective stability and robust performance is maintained for unknown interconnection topology using these schemes.     

A portable,hand-powered microfluidic device for sorting of biological particles

Manually hand-powered portable microfluidic devices are cheap alternatives for point-of-care diagnostics. Currently, on-field tests are limited by the use of bulky syringe pumps, pressure controller and equipment. In this work, we present a manually operated microfluidic device incorporated with a groove-based channel. We show that the device is capable to effectively sort particles/cells by manual hand powering. First, the grooved-based channel with differently sized polystyrene particles was characterized using syringe pumps to study their distributions under various flow rate conditions. Afterward, the particle mixtures were sorted manually using hand power to verify the capability of this device. Finally, the manually operated device was used to sort platelets from peripheral blood mononuclear cells (PBMCs). The platelets were collected with a purity of ~ 100%. The purity of PBMCs was enhanced from 0.8 to 10.4% after multiple processes which results in an enrichment ratio of 13.8. During the process of manual hand pumping, the flow fluctuation caused by unstable injection will not influence the sorting performance. Due to its simplicity, this manually operated microfluidic chip is suitable for outfield settings.     

调控装置自检系统及模拟源的设计

介绍了某型飞机调控装置的组成及工作原理，针对该调控装置在投入正常工作之前无自检功能的弊端，着重论述了利用MCS-51单片机对该装置实现自检功能的硬件电路设计及软件设计。考虑对该装置加装自检功能后，用户需在发动机不开车而发电机不发电的情况下对其实施自检，因此文章阐述了供该系统使用的模拟飞机发电机和永磁机产生的各种交流电模拟电源电路设计。     

Design and implementation of a low-cost observer-based attitude and heading reference system

A nonlinear observer (i.e. a “filter”) is proposed for estimating the attitude of a flying rigid body, using measurements from low-cost inertial and magnetic sensors. It has by design a nice geometrical structure appealing from an engineering viewpoint; it is easy to tune, computationally very thrifty, and with guaranteed (at least local) convergence around every trajectory. Moreover it behaves sensibly in the presence of acceleration and magnetic disturbances.Experimental comparisons with a commercial device illustrate its good performance; an implementation on an 8-bit microcontroller with very limited processing power demonstrates its computational simplicity.     

Development and Control of a ‘Soft-Actuated’ Exoskeleton for Use in Physiotherapy and Training

Full or partial loss of function in the upper limb is an increasingly common due to sports injuries, occupational injuries, spinal cord injuries, and strokes. Typically treatment for these conditions relies on manipulative physiotherapy procedures which are extremely labour intensive. Although mechanical assistive device exist for limbs this is rare for the upper body.In this paper we describe the construction and testing of a seven degree of motion prototype upper arm training/rehabilitation (exoskeleton) system. The total weight of the uncompensated orthosis is less than 2 kg. This low mass is primarily due to the use of a new range of pneumatic Muscle Actuators (pMA) as power source for the system. This type of actuator, which has also an excellent power/weight ratio, meets the need for safety, simplicity and lightness. The work presented shows how the system takes advantage of the inherent controllable compliance to produce a unit that is extremely powerful, providing a wide range of functionality (motion and forces over an extended range) in a manner that has high safety integrity for the patient. A training control scheme is introduced which is used to control the orthosis when used as exercise facility. Results demonstrate the potential of the device as an upper limb training, rehabilitation and power assist (exoskeleton) system.     

Integrated microfluidic drug delivery devices: a component view

Research on drug delivery devices is progressing rapidly with the main objective being the delivery of precise quantity of drugs into the target area of the body. A drug delivery device (DDD) needs to accurately control the flow rate of drug delivery and protects the body from undesired additional doses. An integrated microfluidic drug delivery device (IMDDD) is a miniature device that can regulate and monitor the delivery of the right amount of drug using micro-scale components. IMDDDs offer several advantages including ease of use, electro-chemical controllability, low power consumption, simplicity, fast fabrication, and good bio-compatibility. Various IMDDDs have been developed for treatment of cancer, cardiovascular disorder, eye and brain diseases, stress, and diabetes. This paper presents a generic architecture for IMDDDs, discusses the existing drug delivery methods, summarizes the specifications of the components, and identifies a number of performance evaluation parameters. The operation of IMDDDs is presented through fourteen potential internal components. In addition, recommendations on how enhance the design and fabrication process of IMDDDs are given.     

Fabrication and characterization of a passive silicon-based direct methanol fuel cell

This paper reports on the fabrication and characterization of a passive silicon microfabricated direct methanol fuel cell (μDMFC). The main characteristics of the device are its capability to work without complex pumping systems, only by capillary pressure, and the fact that its performance is not affected by the device orientation. A simple fabrication process based in deep reactive ion etching (DRIE), allows obtaining a reliable and low-cost final device. The device consists of two silicon microfabricated plates mounted together with a commercial membrane electrode assembly (MEA). The impact of current collector design on microfuel cell performance is explored and current–voltage (I–V) and current–power (I–P) curves of the device at different methanol concentration and orientation are presented. Optimal performance was obtained for methanol concentrations between 3 and 5 M, achieving a maximum power density of 12 mW/cm². The results obtained in this work demonstrate the feasibility of the device and give a guideline for design and conditions optimization.     

存在反向有功电量低压用户的研判方法研究

针对部分低压电力用户存在反向有功电量,影响电量计算,引起台区线损指标异常,造成供电企业经济损失的问题。本文基于用电信息采集系统中的用电量数据,提出了一种反向有功电量低压电力用户的研判方法。通过分析分布式光伏用户、电能表错误接线低压电力用户、含有电磁制动设备低压电力用户以及计量装置故障低压电力用户等四类用户存在反向有功电量时的用电量特性,分别建立对应的识别规则,实现对存在反向电量的低压用户类型的快速研判,进而有针对性地对电能表接线错误的低压用户以及计量装置故障的低压用户重点跟踪、监测,以便及时处理,减少供电企业的损失。经实例验证,该方法符合实际业务且有效可行,可显著提高工作效率,同时为电网公司节省人力、物力资源。     

Thermal detection of buried landmines by local heating

A new concept for buried antipersonnel mine (APM) detection is proposed. The detection system is based on a focused heat source and a contactless thermometer mounted on a suspended carriage scanning the ground surface. Presence of heat diffusivity anomalies (mine candidates) is assessed from anomalies in the surface temperature measured after the local heating.

After describing the structure of the proposed system, and the physical functioning principles, we discuss a case study, based on numerical simulations, which proves the feasibility of the device.

Main advantages of the system proposed are the simplicity of the equipment (that is cheap to realize, and easy to use, maintain and repair), and power efficiency.