DS56酵母的性能及在黄酒酿造中的作用

从酒药中分离得1株能产真菌丝的酵母，定名DS56，对其发酵力、耐酒精度、生长状况进行了测定。结果表明，发酵结束产酒精1．5％(v／v)，耐酒精度达13％(v／v)，是一株糖化力较强的酵母，在生米粉中生长繁殖快；在饭上生长稍慢；在麦芽汁琼脂培养基表面生长快，形态多样；在液体里生长缓慢。产酒精能力弱，产酯能力强。在黄酒酿造中可用于制作酒药，使酒药产生特有香气，但在发酵过程中作用不大。(庞晓)     

基于虚拟现实的织物面料展示系统

虚拟现实是利用计算机生成一种模型环境,通过各种输入设备使用户投入到该环境中,实现用户和该环境直接进行自然交互的技术。利用多种相关开发工具的协调,实现一个基于虚拟现实的织物面料展示系统。     

DS3大坝观测自动化系统的结构及原理

介绍DS3复合式测控与信息管理系统的结构模式、工作原理、以及在现场（湖南五强溪电站大坝）安全监测中的应用。     

A facile and feasible method to evaluate and control the quality of Jatropha curcus L. seed oil for biodiesel feedstock: Gas chromatographic fingerprint

To establish a facile and feasible method to evaluate and control the quality of Jatropha curcus L. seed oil for biodiesel feedstock, Gas chromatographic (GC) fingerprint technology was introduced and employed. Initially, the chromatograms of the 13 oil samples from various plantation zones in Guizhou, China were obtained under optimized GC conditions. Ten common peaks were selected as the characteristic peaks for chemometrics, seven of which were identified and quantified by comparing with the standards. The mean chromatogram of S7 (n = 3) was selected as the reference spectrum for similarity analysis based on the influence of the fatty acid composition of the raw material on the fuel properties of resulting biodiesel. Furthermore, the result of SA was confirmed by hierarchical clustering analysis and principal component analysis. By this method, all samples can be classified into three groups. The similarity value of samples approaching 1.000 compared with sample 7 was indicative of the desired fuel properties of biodiesel, indicating the potential practical applications in the quality evaluation and control of biodiesel feedstock.     

基于BP网络和DS理论的雷达电路故障诊断

为了克服使用BP神经网络对雷达电路故障诊断的不足,提出了将BP神经网络和DS证据理论相结合的诊断方法。该诊断方法先用BP神经网络分别对雷达电路的电压电流特性进行故障诊断,将诊断后的结果再通过DS证据理论进行信息融合,从而得到更为可靠的诊断结果,具有一定的工程实际意义。     

多路温度检测系统的设计与研究

现如今很多场合需要对其温度进行实时检测,如粮库、锅炉等,本文主要研究多路温度检测系统的建立及应用。以STC89C52为核心控制芯片,用数字温度传感器DS18B20来测试温度,用移位寄存器74HC595驱动数码管,LM7805稳压芯片为系统提供稳定电压,最后由MAX232电平转换芯片通过串口向单片机下载程序,最终实现多路温度的检测,具有快速、准确、可靠、经济、简单等特点。实验结果表明,所测温度范围为-55℃～125℃,在-10℃～＋85℃范围内精度为±0.5℃,适合普通场合的多路温度检测,该设计系统有很大的发展潜力,具有较大现实应用意义。     

一线式数字温度计DS1822的原理及应用

DS1822是美国Dauas公司推出的基于单总线技术的数字温度计芯片。文中介绍了DS1822的结构、外形封装、基本操作指令、测温原理及测温过程，简要描述了DS1822的报警操作以及DS1822的内部存储器结构，最后给出了DS1822的一个实际测温电路。     

PN sequence blind estimation in multiuser DS‐CDMA systems with multipath channels based on successive subspace scheme

In this paper, we proposed a new method based on expanding subspace algorithm and finite alphabet characteristics, for blind estimation of the users' spreading sequences in the multiuser direct sequence code division multiple access system in the presence of the multipath channels. In the proposed scheme, we show that the estimation of the users' overall channels in the direct sequence code division multiple access system is equivalent to the impulse response estimation of the multi‐input multi‐output finite impulse response channels. Our proposed approach is based on the successive estimation of the columns of the equivalent multi‐input multi‐output finite impulse response channels from the lowest degree columns to the highest degree ones. Accordingly, each user's overall channel that is the convolution of the original multipath channel and the spreading sequence is estimated. Then we extract PN sequences from the overall channel using finite alphabet characteristics of the spreading sequence chips for each user. According to simulation results, our proposed scheme outperforms the conventional methods in that it does not require symbol synchronization and does not have channel constraints (for example, AWGN and single user system) in the multipath channels.     

数字式温度传感器在自动供水系统中的应用

针对常温测量电路中使用模拟温度传感器的不足，给出了数字式温度传感器在运水车自动供水系统中应用的实例，阐述了自动供水系统的硬件结构原理和系统软件组成，并给出了DS18820的使用方法及使用单线器件需要注意的问题。文中介绍的内容已经成功地应用在自动供水系统产品中。     

Blind Channel Estimation for Multi-Rate Multicarrier DS/CDMA Communications

Multi-rate multicarrier DS/CDMA is a potentially attractive multiple access method for future wireless communications networks that must support multimedia, and thus multi-rate, traffic. Several receiver structures exist for single-rate multicarrier systems, but little has been reported on multi-rate multicarrier systems. Considering that high-performance detection such as coherent demodulation needs the explicit knowledge of the channel, based on the finite-length chip waveform truncation, this paper proposes a subspace-based scheme for timing and channel estimation in multi-rate multicarrier DS/CDMA systems, which is applicable to both multicode and variable spreading factor systems. The performance of the proposed scheme for these two multi-rate systems is validated via numerical simulations. The effects of the finite-length chip waveform truncation on the performance of the proposed scheme is also analyzed theoretically.