光纤传感器的现状和展望

介绍光纤传感器的主要性能特点及所涉及的领域;近年来光纤传感器技术的发展、应用的现状及其前景展望.     

高压液相色谱法测定婴儿配方奶粉中低聚果糖

采用高压液相色谱法（HPLC）,以资生堂的UGSOS5柱为分析柱,示差折光仪为检测器,一次进样同时测定低聚果糖中的蔗果3糖,蔗果4糖,蔗果5糖1,回收率在98．8—105．9,RSD（％1在0．20—0．26之间,最低检出限在微克级。     

Active Vibration Control of SMA Actuated Structures using Fast Output Sampling Based Sliding Mode Control

Abstract

Fast Output Sampling (FOS) based discrete sliding mode control is designed for Shape Memory Alloy (SMA) actuated structures to suppress the structural vibration. For the design of discrete sliding mode control the reaching law, method proposed by W. Gao is used. The simulation results demonstrate the performance of the controller. The proposed control technique achieves good vibration suppression. This methodology is more practical and easier to implement, since the measurement or estimation of the system states is not needed for designing the controller.     

Effect of temperature and pH on the degradation of fructo-oligosaccharides

The degradation process of fructo-oligosaccharides has been studied in buffered solution affected by temperature and pH. The system has been incubated at 60, 70, 80, 90 and 100 oC; pH has been varied between 2.7 and 3.3. The carbohydrate compositions of the solution-samples have been analyzed by an accurate analytical method for oligosaccharide determination (HPLC with differential refractometric detection). Under acidic condition the hydrolysis of fructo-oligosaccharides is insignificant at 60 oC; however, already at 70–80 oC it is so considerable, that the amount of them could be bisected in 1–2 h. Meanwhile, all of the oligomers are degraded in 1–1.5 h at 90–100 oC. The increase of proton concentration of the solution makes degradation faster; however, there is a slighter effect of pH on the rate of hydrolysis than of temperature in the studied range. The rate of the changes in the value of average degree of polymerisation (DP_a) significantly depends on the temperature and pH.     

Comparison of sucrose and fructo-oligosaccharides as osmotic agents in apple

Fructo-oligosaccharides and sucrose were compared as osmotic agents in the osmotic dehydration of apple cv. Idared. Dehydration process of apple cubes (10  10  10 mm) was performed to determine the weight reduction (WR), moisture content (MC), water loss (WL) and solid gain (SG) over a range of osmotic solutions (40–60% w/v), temperature (40–60 °C) and processing time (20–40 min) The effective diffusion coefficient of water and solute was calculated assuming the processes to be governed by Fick's unsteady state diffusion. The effective diffusion coefficients were found to be of the order of 10^− 9 m² s^− 1 and were effected by the type of solute significantly. The WR, MC, WL and SG were predicted as weighted linear combinations of temperature, concentration of solute and time of OD.

Industrial relevance

The use of fructo-oligosaccharides (FOS) in different fruit based products is an efficient way to enrich human diet with functional component, because of the well-known health benefits of FOS. The osmotic behaviour of fructo-oligosaccharides were studied and compared to the conventional used sucrose. In view of the changes of different osmotics regarding to unit parameters of osmotic dehydration the results give possibility to industrial technology planning of products containing FOS, which are available for consumption in every season of the year and are favourable also in processed form e.g. muesli, dairy products.     

Fractional active disturbance rejection control

A fractional active disturbance rejection control (FADRC) scheme is proposed to improve the performance of commensurate linear fractional order systems (FOS) and the robust analysis shows that the controller is also applicable to incommensurate linear FOS control. In FADRC, the traditional extended states observer (ESO) is generalized to a fractional order extended states observer (FESO) by using the fractional calculus, and the tracking differentiator plus nonlinear state error feedback are replaced by a fractional proportional-derivative controller. To simplify controller tuning, the linear bandwidth-parameterization method has been adopted. The impacts of the observer bandwidth ω_o and controller bandwidth ω_c on system performance are then analyzed. Finally, the FADRC stability and frequency-domain characteristics for linear single-input single-output FOS are analyzed. Simulation results by FADRC and ADRC on typical FOS are compared to demonstrate the superiority and effectiveness of the proposed scheme.     

基于分布式的省域高速公路联网监控系统方案

分布式视频监控系统正广泛应用.在分析当前高速公路数据交互需要的基础上,结合高速公路业务平台的需求分析,提出建立基于分布式的省域高速公路联网监控系统.它是一种面向业务的,具有模块化、开放性和先进性的监控系统.通过联网监控系统能充分发挥交通监控的路径诱导、多路径交通流量调控的功能,并且能最大程度地发挥高速公路网络的通行能力.     

低聚果糖糖浆的制备工艺研究

为了提高低聚果糖糖浆成品的色泽,满足客户的需求,通过单因素实验确定了最佳工艺条件。最佳工艺参数如下：反应温度为55℃,催化剂添加量为20%（质量分数）,活性炭用量为1.5%（质量分数）,脱色温度为60℃,脱色时间为40 min。本工艺操作简便,适用于工业化生产。     

利用工程措施提高水工建筑物抗滑稳定性的分析

本文将Bishop法、传递系数法、分块极限平衡法以及纯摩法综合在一起 ,结合某具体工程 ,对提高抗滑稳定安全系数K所采用的各项加固措施的效果进行了分析     

低聚果糖生产的新工艺

对低聚果糖的应用及生产情况进行了综述.在大量实验的基础上对低聚果糖的生产工艺进行优化.研究了活性炭种类、上样速率、吸附剂种类及其浓度等条件对产品质量和收率的影响.得到低聚果糖生产的优化工艺条件.