基于MSP430F169的水声遥控发射系统设计

随着水声通信技术的快速发展,水声遥控系统也已投入使用,它在水下通信、遥测及水下航行器的控制等方面有着广阔的应用前景.该设计基于微功耗单片机MSP430F169作为处理器设计路以便实现不同频率信号的产生、选择及显示,并选用D类功放对所产生的信号进行功率放大.系统软件根据所设计的电路进行移频编程,根据MFSK调制的基本原理,通过采用添加保护时间抵抗码间干扰的编码方案,完成不同遥控信号的产生、控制及显示.     

G.169自动电平控制装置标准及其实现

介绍ITU－T G．169自动电平控制装置标准及其性能要求，提出一种基于该协议的自动电平控制系统结构，并设计系统的实现算法，计算机仿真结果表明，笔者提出的ALC系统可行有效，能满足G．169的要求。     

Angle-resolved photoemission spectroscopy of band tails and anomalous kinetics of underdoped cuprates

The electron-phonon interaction in cuprates with c-axis polarised optical phonons, which is roughly one order of magnitude stronger than superexchange, bounds holes into mobile bipolarons. Bipolarons pin the chemical potential within the charge-transfer gap of doped Mott insulators, accounting for unusual kinetics and thermodynamics of doped cuprates such as the Nernst and giant proximity effects, pseudo-gaps, and normal-state diamagnetism. We propose that “quasi-particle” peaks, “Fermi-arcs”, and high-energy “waterfalls” in the photoemission spectra of cuprates originate from the photo-ionization matrix elements of disorder-localised band-tails in the charge-transfer gap.     

基于AVR ATmega169的张力检测仪设计

分析应变测量原理,应用应变片敏感栅作为传感器,结合仪表放大器电路和高集成度的单片机ATmega169实现低功耗便携式张力测试仪的设计。该系统功耗低、测量准确、直接数字读出,具有多种附加功能。成功解决了由经验判断引起的偏误过大问题。给出在实际应用中硬件电路和软件程序的实现方案。分析设计中常见的问题,并给出解决问题的思路。对相关的测量仪表设计、开发有一定参考作用。     

四象限探测器光电跟踪伺服系统的研究

为了实现光电跟踪目标,用四象限探测器检测目标物,利用单片机MSP410F169的AD采集,将采集到的信号进行滤波,利用PID算法,以及单片机MSP410F169的时钟控制PWM波的占空比来调节电机的转速。通过两个电机来实现跟踪装置的空间旋转跟踪目标物。     

基于Msp430单片机的直流电子负载设计

以Msp430F169单片机为控制芯片,通过设计外围键盘液晶显示模块、A/D采集输入电路、D/A转换输出电路、多路电源输出模块和恒流源输出电路,配合系统软件设计,制作了一款可靠实用的直流电子负载。经实验测试,该直流电子负载可靠性好、测量精确度高、抗干扰能力强,具有较强的实用价值。     

Neutron capture cross section of 169Tm measured at the CSNS Back-n facility in the energy region from 30 to 300 keV

The capture cross sections of the ¹⁶⁹Tm\begin{document}$ (n, \gamma) $\end{document} reaction were measured at the back streaming white neutron beam line (Back-n) of the China Spallation Neutron Source (CSNS) using four C₆D₆ liquid scintillation detectors. The background subtraction, normalization, and correction were carefully considered in the data analysis to obtain accurate cross sections. For the resonance at 3.9 eV, the R-matrix code SAMMY was used to determine the resonance parameters with the internal normalization method. The average capture cross sections of ¹⁶⁹Tm for energy between 30 and 300 keV were extracted relative to the ¹⁹⁷Au\begin{document}$ (n, \gamma) $\end{document} reaction. The measured cross sections of the ¹⁶⁹Tm\begin{document}$ (n, \gamma) $\end{document} reaction were reported in logarithmically equidistant energy bins with 20 bins per energy decade with a total uncertainty of 5.4% – 7.0% in this study and described in terms of average resonance parameters using a Hauser-Feshbach calculation with fluctuations. The point-wise cross sections and the average resonance parameters showed fair agreement with the evaluated values of the ENDF/B-VIII.0 library in the energy region studied.     

Influence of frictional anisotropy on contacting surfaces during loading/unloading cycles

This paper presents numerical investigations on the loading and unloading of a three-dimensional body in frictional contact with a rigid foundation. The evolution of the sliding process during loading/unloading cycles is analyzed. The important case of anisotropy is examined along with the effect of the sliding rule. The solution algorithm is based on a variational inequality which combine the contact problem and the frictional problem. The numerical results of the punch problem show the hysteretic and irreversible behavior occurring when friction is anisotropic.     

基于MSK4226的直流有刷电机四象限控制

在设计中使用MSP430F169单片机提供控制电机需要的PWM信号,通过电机驱动芯片MSK4226实现直流电机的四象限运行;驱动芯片上的电流测量环节保证电机运动中不发生堵转;最后比较了电机直接启动与四象限控制中的响应速度与达到稳态的时间。