数据转换系统中放大器的选择

随着广播电视技术的不断发展 ,模拟信号传输向数字信号传输的转换已成为必然。介绍模数转换系统中放大器的性能、关键技术 ,并就放大器的选择作详细探讨。     

逻辑型多变量鲁棒自校正解耦间接算法

本文提出了一种多变量鲁棒自校正解耦间接算法。它采用一种新的正则化和相对死区实现了鲁棒自校正解耦控制。这种方法可以使系统跟踪特性不受死区界和正则化因子的影响。本文还给出了算法的鲁棒性分析和仿真结果。     

Dynamics of hydrated iron(II) cations in nafion polymer membranes

Mössbauer studies of Fe²⁺ in water-soaked nafion polymer membranes in the temperature range between 90 K and 250 K have been performed. Above a critical temperature (～ 180 K) the spectra exhibit both elastic narrow absorption lines and quasielastic broad lines. These spectra are typical of bounded diffusion phenomena observed by Mössbauer spectroscopy in macromolecular systems like haemoglobin, myoglobin and ferritin. Similar spectral shapes have been observed by quasielastic neutron scattering from water in nafion membranes. Within 50 K above the critical temperature the total Mössbauer absorption area decreases by an order of magnitude whereas the narrow absorption line decreases by two orders of magnitude. The results are interpreted in terms of bounded diffusive motion of the iron. Using a model based on overdamped harmonically bound Brownian motion, the essential parameters of the iron motion can be derived as a function of temperature. The iron motion most probably reflects the motion of a large Fe²⁺ complex, e.g. Fe(H₂O)²⁺₆, which is attached to the polymer side chains via the sulphonic group.     

对投入与产出优化分析方法的应用探讨

介绍投入与产出优化分析的一些基本概念和计算方法 ,并结合实际 ,举例说明投入与产出的优化分析方法具体应用     

触摸输入技术探析

本文扼要概述触摸输入的４种技术，及其应用与性能比较。     

像增强器亮度增益和等效背景照度测试仪的研制

亮度增益和等效背景照度是衡量像增强器性能的两个重要参数，针对这两个参数的测试要求，阐述像增强器亮度增益和等效背景的测试原理和测试仪的结构设计。利用研制的测试仪对多种型号的像增强器的亮度增益和等效背景照度进行了测试，给出并分析了测试结果。结果表明，本测试仪的结构设计是合理有效的。     

数据录入约束与导航器

信息软件使用的方便性、易用性、安全性和稳定性在很大程度上取决于数据录入方式的优劣。分析了数据录入的约束规则，探讨了录入导航原理，并介绍了一种已在开目管理软件中普遍采用的数据录入导航器组件。     

On the Auditory Modality Superiority Effect in Serial Recall: Separating Input and Output Factors.

The modality effect in immediate recall refers to superior recall of the last few items within lists presented in spoken as opposed to printed form. The locus of this well-known effect has been unclear. N. Cowan, J. S. Saults, E. M. Elliott, and M. Moreno (2002) introduced a new method to distinguish between the effects of input serial position, output serial position, and the number of items yet to be recalled and found that large modality effects occurred only in conditions in which delay and interference at output (from items already recalled) was high. The authors replicated that finding, even when the response period included output interference acoustically similar to the spoken stimuli to be recalled. However, the authors found that output delay and interference act only by lowering the level of performance to a more sensitive range. The modality effect thus originates during encoding of the list to be recalled, not during output. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

技术进步经济效益评价——中国长城铝业公司水泥厂产出增长中技术进步作用的评价

本文通过运用“生产函数法”、“增长速度方程”来定量分析技术进步在长城铝业公司水泥厂产出增长中的作用,从中找出该水泥厂生产经营过程中存在的问题及未来发展方向。