微机控制集成运放参数的自动测试

TP—801控制集成运放参数的自动测试系统具有自动测试、自动分档、计数、显示、打印等功能。速度快、结构简单、测试简便、可靠与成本低是系统的主要特点。本文介绍了硬件框图、软件结构和主程序流程图。通过介绍一个测试过程、调试与整定方法,简述计算方法、测试范围与测试精度等问题。     

铀的双原子分子化合物的势能函数和热力学性质

应用原子分子反应静力学基本原理和相对论有效原子实的量子力学ab initio计算方法。系统地研究了铀的双原子分子化合物UX（X=0、H、C、N)的平衡结构和离解能,确定了其正确的电子状态和合理的离解极限,拟合出双原子分子的Murrell-Sorbie势能曲线,在此基础上导出光谱数据和力常数,并采用量子力学方法计算了其热力学函数值。     

多场景概率机组组合在含风电系统中的备用协调优化

备用配置是系统抵御风险、提高运行可靠性的重要手段,也是系统运行安全与经济协调决策的问题。提出了基于状态转移的概率机组组合方法,该方法将风电的运行场景离散化,通过对风电预测误差进行概率表达,并在时间尺度上考虑状态的转移矩阵组成多场景的方法,以场景发生的概率协调系统在场景下的调度决策,并以实时校正备用作为正常和误差场景之间机组的调整限制。通过安全与经济的协调,能够自动为风电出力的波动配置适宜的备用,且模型中考虑了网络安全约束对机组组合和备用决策的影响。最后对含风电系统进行了实例仿真分析,结果表明模型的有效性和可行性,对风电的调度和规划具有指导意义。     

Modeling and operation optimization of RE integrated microgrids considering economic,energy, and environmental aspects

Microgrids provide promising solution for integration of renewable energy sources in the electrical grid. To exploit the key benefits, achieving the economical operation of renewable aided microgrids has become necessary and is a challenging task. This paper presents an efficient optimization model to minimize the operational cost of a solar integrated microgrid. We formulate a joint optimization mixed integer problem for appropriate modeling of the system under various practical constraints. An efficient solution is obtained with a distributed approach such that the original problem is solved in two stages. Dual decomposition approach is adopted for cost, emissions, and solar share optimization. Lagrange relaxation, Lambda iteration method, and binary integer programming are employed to obtain the joint optimization solution. Finally, the performance of the proposed model is validated through simulations that show that an overall cost reduction of 4.2070e+04 $ and emission reduction of 7.2001e+03 kg are achieved with the proposed model.     

Multimodal Optically Nonlinear Nanoparticles Exhibiting Simultaneous Higher Harmonics Generation and Upconversion Luminescence for Anticounterfeiting and 8-bit Optical Coding

Nonlinear optical materials are essential in areas such as nanophotonics, optical information processing, and biomedical imaging. However, nanomaterials employed for these diverse applications to date are efficient only for one type of nonlinear optical activity. Herein, the first multimodal nonlinear optically active class of nanomaterials based on lanthanide-doped lithium niobate nanoparticles, which simultaneously exhibit unprecedentedly efficient second and third harmonic generation, as well as up-conversion photoluminescence, is reported. These dielectric nanoparticles retain their high nonlinear optical conversion efficiency both as powder and as aqueous colloidal solution. The high stability also allows for the fabrication of optically active biocompatible micron-sized fibers and polymer-based 3D-printable objects, as well as for fingerprint detection. Finally, the first 8-bit coding platform purely based on multimodal nonlinear optical activity originating from different parametric and nonparametric processes is demonstrated, showcasing the technological potential of these materials for both anti-counterfeiting and advanced optical information processing.     

基于DSP的超声多普勒胎儿监护仪研究与实现

文中介绍基于DSP的超声多普勒胎儿监护仪的工作原理及实现方法.系统中超声探头的输出信号能够准确地反映出心跳过程,信号杂波较少.宫缩压力探头能够灵敏地反映出胎动时母体子宫收缩程度的变化.由TMS320LF2407A构成的DSP模块完成对胎心信号、宫缩压力信号和胎. 动标记请求信号的实时处理,同时实现心跳的音量控制.临床试验表明,此系统实现了胎儿心跳信号的无创拾取、胎心率及宫缩压的计算和实时输出,符合国家标准.     

有限双极性软开关PWM控制和IGBT驱动电路设计

PWM调制和IGBT驱动电路用于对IGBT逆变主电路的驱动信号的直接控制,调制方法和驱动电路直接决定着焊接质量.为了改善器件的运行环境,降低开关损耗,现选用电流脉宽调制芯片UC3846为核心,采用有限双极性软开关PWM控制技术实现脉冲调制,并设计了相应的IGBT驱动电路.实现了PWM信号的隔离、放大和保护,对IGBT的正常工作及其保护起着非常重要的作用,控制IGBT的开关工作过程.调节各种参数进行实验,结果表明设计思路的切实可行,驱动电路性能良好.     

软开关逆变点焊控制电路的设计

通过对逆变电阻点焊设备的现状分析，介绍了软开关逆变点焊的控制系统．讨论了主控系统、反馈系统的工作原理．并具体设计、实现了单片机对移相芯片UC3879的高精度控制，电流反馈的控制等。     

A solution to the unit commitment problem—a review

Unit commitment (UC) is an optimization problem used to determine the operation schedule of the generating units at every hour interval with varying loads under different constraints and environments. Many algorithms have been invented in the past five decades for optimization of the UC problem, but still researchers are working in this field to find new hybrid algorithms to make the problem more realistic. The importance of UC is increasing with the constantly varying demands. Therefore, there is an urgent need in the power sector to keep track of the latest methodologies to further optimize the working criterions of the generating units. This paper focuses on providing a clear review of the latest techniques employed in optimizing UC problems for both stochastic and deterministic loads, which has been acquired from many peer reviewed published papers. It has been divided into many sections which include various constraints based on profit, security, emission and time. It emphasizes not only on deregulated and regulated environments but also on renewable energy and distributed generating systems. In terms of contributions, the detailed analysis of all the UC algorithms has been discussed for the benefit of new researchers interested in working in this field.     

基于UC3842控制的芯片电泳电源设计

基于UC3842高性能控制芯片,提出了一种小功率反激式电源设计方案,很适合芯片电泳等精密电子仪器的电源系统.文章分析了电路原理,详细计算了电路中变压器的参数,并对电路性能进行了测试.