采用 AD590 集成温度传感器测温

集成温度传感器是两端式恒流器件具有标准化输出。采用ＡＤ５９０集成温度传感器进行温度测量。测量精度高，测温范围宽而且容易实现。因为ＡＤ５９０是恒流器件，所以适合远距离传送，也容易实现智能数字化显示     

我国企业生产系统整体化管理初探

简要介绍了生产系统的特征及分类，针对生产物质条件对生产过程约束性的强弱把生产系统分为刚性生产系统（ＩｎｆｌｅｘｉｂｌｅＭａｎｕｆａｃｔｕｒｉｎｇＳｙｓｔｅｍ）与柔性生产系统（Ｆｌｅｘｉ ｂｌｅＭａｎｕｆａｃｔｕｒｉｎｇＳｙｓｔｅｍ），讨论了系统两个领域现有研究成果与难点。在现有理论研究成果的基础上构造了适合我国企业整体技术状况的生产系统整体化管理模型。     

集成油路块的智能式CAD

分析总结了液压集成油路块的设计规律，介绍了借助人工智能技术、数据库技术和软件工程学的方法设计集成油路块结构的方法，在智能式计算机辅助设计方面进行了有益的探索。     

最小阶时分滤波器及其在运载体对准中的应用

设计一种时分降低滤波器用来进行运载体惯导系统的动态对准和传递对准，假定运载体惯导系统已标定的。在运载体水平直线运动的短时间内，两个二阶滤波以时分工作方式估计平台水平失调角，在消除水平失调角后，运载体在垂直与当地垂线的水平面内机动，此时用一个三阶（或四阶）滤波器来估计方位失调角，另外，在本文中给出该滤波器的数据压缩算法，来提高估计精度。     

计算机电信集成技术及其发展

本文介绍了计算机电信集成技术及其进展，特别详尽分析了它的三种实现形式：点对点形式、交换机－计算机形式、客户／服务器形式。     

Physiological cost of energy-equivalent noise exposures with a rating level of 85 dB(A):: Hearing threshold shifts associated with energetically negligible continuous and impulse noise

In industry continuous or impulse noise does not occur exclusively; rather it is a combination of both. If low-level continuous noise or impulse noise (below 120 dB) is added to an already existing high-level continuous noise this often numerically causes no essential increase in the rating level. Yet, it cannot be expected that also aural strain of these exposures is always negligible. Therefore, in a cross-over test series, ten male subjects (Ss) were exposed to white noise of 94 dB(A) for 1 h (TS I), energy-equivalent to an 8 h-rating level L_Ard of 85 dB(A). In a second test series (TS II) the same exposure was combined with 900 energetically negligible 5-ms impulses with a noise level of 113 dB(A) which increased the rating level by only 0.4 dB. The noise exposure of TS I and TS II was followed by an idealized resting phase in a soundproof cabin. In a third test series (TS III) the continuous noise of 94 dB(A) / 1 h was followed by 3 h of white noise at 70 dB(A). Such an additional load increases the L_Ard by merely 0.1 dB to 85.1 dB(A). In all three test series, the noise-induced temporary threshold shift (TTS₂) and its restitution were measured. The continuous noise exposure of 94 dB(A) for 1 h was associated with a TTS₂ of around 20 dB which disappeared completely after about 2 h. The additional impulse noise caused a small increase in the TTS₂ and a prolongation of the restitution time. The maximum mean temporary threshold shift for the group increased only slightly (from 22.5 to 25.9 dB, which nevertheless can be statistically proven at a significance level of p 0.99). Yet, more importantly, the restitution time increased from 126 to 175 min, i. e. 3 h, which can be statistically proven at a significance level of p0.95. The TTS₂-values of TS III did not differ significantly from those resulting from TS I. That was expected as the conditions up to that point in time were identical. But due to the additional subsequent exposure, the mean restitution time increased considerably from 126 min up to 240 min (4 h). The mean total physiological cost represented by the integrated restitution temporary threshold shift (IRTTS) increased in TS II by approximately 40% and in TS III even by 140%.

Relevance to industry

The results of the study show that levels of noise which have no influence on the rating level which traditionally is calculated according to the energy-equivalence principle are often of great importance, as they can lead to considerably prolonged restitution times. Therefore, the purely energy-equivalent determination of the rating level of both impulse noise and low sound levels can lead to an underestimation of latent problems so that over time a reversible TTS can evolve into a permanent threshold shift. The results are also of importance for the acoustic design of break rooms for noise-exposed workers. There should be conditions that allow an undisturbed restitution of hearing.     

基于SHDSL的IAD接入技术

单线对高比特率数字用户线(SHDSL)支持利用现有铜线对进行上、下行速率对称的宽带数据接入(在相类似的技术中,其性能最佳)。综合接入设备(IAD)完成各种网络终端的统一接入,并将这些话音、数据等多种业务融合在一起,统一实现各自的功能。将这两项技术完美地结合,可为NGN提供一种全新地宽带接入方式。文章主要分析了基于SHDSL的IAD接入的网络结构、SHDSL功能模型、用户数据的映射和封装,以及基于SHDSL的IAD技术应用前景。     

基于FPGA的RapidIO核接口芯片的设计和实现

新型嵌入式系统采用基于交叉开关的互连模式，用于系统互连的交叉开关是以RapidIO协议为核心的。RapidIO协议是一个点对点、包交换的协议。通过对RapidIO协议的研究，掌握了实现该协议的关键技术。使用Xilinx公司的FPGA(可编程门阵列)芯片实现基于RapidIO核的终端设备，并通过软件仿真和硬件实验系统对其功能进行验证。     

Technological aspects on the fabrication of silicon-based optical accelerometer with ARROW structures

The fabrication and characterization of an optical accelerometer based on silicon technology and using BESOI wafers is presented. Instead of the standard total internal reflection (TIR) waveguides, AntiResonant Reflecting Optical Waveguides (ARROW) have been used. On the basis of a quad beam accelerometer design, a sensing waveguide has been placed on the seismic mass. Its misalignment with the waveguides located at the frame allows measuring the acceleration. The mechanical structure has been designed so as to have a span of 2 μm, that should provide with a sensitivity of 4.6 dB/g. Reference waveguides measured by end-fire coupling have low radiation and insertion losses (0.3 and 2.5 dB, respectively). High insertion losses are observed due to imperfections in polishing when V-grooves with glass anodic bonding are used. This fact causes the reduction of its sensibility to 2.3 dB/g.     

基于现场总线的TSI和TDM一体化设计

本文率先提出了采用现场总线技术将汽轮机监视装置和瞬态数据管理系统整合的思想。设计了汽轮机监视装置和瞬态数据管理一体化系统的体系结构，通过基于CAN的令牌总线网络解决了系统间互联通信中的关键技术问题——介质共享访问解决方案。