一种闭环微纳定位扫描系统设计

针对小推力压电陶瓷的特性,提出了一种闭环微纳定位扫描系统设计。该系统以单片机80C196KC为核心,使用12位A／D转换器MAX120和12位D／A转换器DA7521做D／A转换,模拟驱动部分采用前置低压误差运放和后置高压精密运放组成双级放大模块;控制部分采用Fuzzy-PID复合控制算法进行非线性处理,很好地改善了压电陶瓷的迟滞、蠕变、非线性等不足,且提高了控制系统的精度。将本系统应用于白光相移干涉检测,实验结果表明：闭环电压控制的最大误差为18mV,置位重复精度为6nm,系统相对误差为0．15％;在位移量为10μm的时间一位移阶跃响应曲线中阶越响应时间约为20ms,且在电压为80V的蠕动曲线中,3min内的蠕变为3．6％,3min以后变化开始缓慢。     

面向80后的智能床设计策略

目的对25~35岁使用人群的智能床设计原则与设计策略进行研究,使产品顺应人的生活方式和行为习惯,为智能产品与传统家居产品的结合提供思路。方法通过用户旅程图、接触点分析以及问卷访谈等进行行为和需求分析,结合用户体验设计、交互设计理论与方法,形成以80后用户群体为目标的智能床设计原则和设计策略。结论通过深入的用户分析,得到智能床的设计原则和设计策略,能够为这种新兴的产品设计提供基本的参考,便于用户更快更好地接受和使用产品。     

Effects of T5 heat treatment on extrusion welds in AZ80 hollow profile

AZ80 hollow profile was produced by porthole-die extrusion. The mechanical behavior and microstructure characteristic of extrusion welds in AZ80 hollow profile during different T5 heat treatments were investigated. Five kinds of morphologies of β-Mg₁₇Al₁₂ were observed in turn in weld regions under various temperatures. Extrusion weld is not weakest region in AZ80 hollow profile in terms of hardness, the peak hardness of weld regions is roughly equal to the weld-free regions at different aging temperatures, which is attributed to similar volume fraction, morphology, and size of β-Mg₁₇Al₁₂ precipitate in weld regions and weld-free regions. The precipitate-free zones (PFZs) usually form near the welds interface in aging process, and the hardness of PFZs is usually lower than those of weld regions and weld-free regions. Aging at 200°C for 24?h is suitable heat treatment system for AZ80 hollow profile, which can achieve excellent mechanical property and simultaneously reduce the width of PFZs.     

Parameterized complexity of control problems in Maximin election

Elections are a central model in a variety of areas. This paper studies parameterized computational complexity of five control problems in the Maximin election. We obtain the following results: constructive control by adding candidates is W[2]-hard with respect to the parameter “number of added candidates”; both constructive and destructive control by adding/deleting voters are W[1]-hard with respect to the parameter “number of added/deleted voters”.     

基于80C186处理器的多功能实验板的研制

针对近年来飞机含80C186处理器电路板修理现状,为掌握该系列板件的修理能力,迫切需要开展其软件测试技术研究.从封装、类型以及时序分析角度,在对80C186处理器进行系统阐述基础上,设计并研制一块基于80C186处理器的多功能(包括串口通信、并口检测以及定时计数功能)实验板,给出该板的硬件电路图与软件流程框图,并基于汇编语言在QTH-2008PCI开发环境下进行功能调试,实验结果表明其有效性.所做的含80C186处理器的正向设计与软件编程研究工作对于逆向修理含80C186处理器飞机电路板板件有很大帮助.     

基于UniSPeech-SDA80D51的车载音响声控系统

提出一种语音命令控制车载音响操作的设计方案,以德国Infineon公司新推出的具有DSP和单片机双核的SoC语音处理芯片UniSpeech-SDA80D51为核心组成非特定人车载音响语音控制系统,并实现了系统样机的研制.该系统在江淮同悦SL1102C1型车载音响上进行了语音控制实测,实测数据表明系统语音识别率可达到95...     

TMS320C80的快速DCT及量化的实现

简要说明了 TMS32 0 C80的结构和特点 ;分析了快速 DCT的基本原理 ;论述了在 TMS32 0 C80上实现快速 DCT及量化的方法 ,并给出算法的测试结果 .     

基于双口RAM的双CPU之间的实时双向通信

介绍一种通过双口RAM和可编程逻辑器件实现单片机80C196KC和工控机PCI04之间实时双向通信的方法.对双口RAM-IDT7130和可编程逻辑器件ISP1032E的性能和特点作了详细介绍,给出了利用IDT7130和ISP1032E实现单片机80C196KC和PC104之间进行高速数据通信的接口电路及软件实现方案.     

Low-rank Kronecker-product Approximation to Multi-dimensional Nonlocal Operators. Part I. Separable Approximation of Multi-variate Functions

The Kronecker tensor-product approximation combined with the -matrix techniques provides an efficient tool to represent integral operators as well as certain functions F(A) of a discrete elliptic operator A in ℝ ^d with a high spatial dimension d. In particular, we approximate the functions A ⁻¹ and sign(A) of a finite difference discretisation A∈ℝ ^{N × N} with a rather general location of the spectrum. The asymptotic complexity of our data-sparse representations can be estimated by (n ^p log ^q n), p = 1, 2, with q independent of d, where n=N ^{1/ d} is the dimension of the discrete problem in one space direction. In this paper (Part I), we discuss several methods of a separable approximation of multi-variate functions. Such approximations provide the base for a tensor-product representation of operators. We discuss the asymptotically optimal sinc quadratures and sinc interpolation methods as well as the best approximations by exponential sums. These tools will be applied in Part II continuing this paper to the problems mentioned above.     

"Publishing opinions: A note on the usefulness of commentaries": Comment.

Comments on J. J. Christensen-Szalanski and L. R. Beach's (see record 1984-21471-001) conclusion that the attention given to commentaries and replies to articles did not justify the extra space and argues that citation indexes do not measure the major usefulness of these commentaries. (PsycINFO Database Record (c) 2010 APA, all rights reserved)