二氧化钛光催化氧化水中天然有机物富里酸

以p-25型纳米TiO2为催化剂对富里酸(fulvic acid,FA)进行了光催化氧化的试验研究。考察了光催化剂投加量,FA的初始浓度,pH值等因素对FA光催化去除效果的影响。结果表明:投加纳米TiO2作光催化剂后可使得FA的去除率由单使用紫外光照射的35%提高至92%~100%。本试验条件下,FA的光催化降解遵循一级反应动力学规律,光催化降解速率常数K值随着FA初始浓度的增大而减小,且分别在TiO2投加量为0.3 g/L和pH=7时有最大值,对处理后的水样进行三维荧光分析发现FA在光催化过程中没有转化成新的荧光物质。     

热处理对鱿鱼上清液中氧化三甲胺降解的影响

氧化三甲胺(Trimethylamine N-oxide,TMAO)是水产品中的一种天然鲜味成分,但在不同条件的影响下也会分解为有害物质,对人体健康造成影响.为研究鱿鱼上清液在热处理过程中TMAO的降解对氨基酸和还原糖的影响,测定了反应前后鱿鱼上清液中甲醛(Formaldehyde,FA)、二甲胺(Dimethylam...     

Study of the chemical composition of edible red macroalgae Grateloupia turuturu from Brittany (France)

The chemical composition and its seasonal variation of the red seaweed Grateloupia turuturu, an invasive macroalgae from Brittany, France, were investigated. Size, ash, protein, lipid, dietary fibre (soluble, insoluble and total), protein pigment (R-phycoerythrin, R-phycocyanin), and fatty acid content were measured in G. turuturu samples collected over 1 year (2006). The average size of this seaweed was 32.0 cm long and approximately 5.0 cm wide, while the size of the thallus was maximal in June (in length and width). On the dry weight basis, this alga was constituted of more than 18% ash, about 23% protein, 2.6% lipids, and approximately 60% dietary fibre. The most abundant fatty acids were palmitic acid and eicosapentaenoic acid (52% and 12% of the fatty acid fraction, respectively). The study of seasonal variations showed that the best period to collect the seaweed for food use is between February and June.     

Effect of cooking methods on fatty acids,conjugated isomers of linoleic acid and nutritional quality of beef intramuscular fat

The effect of boiling, microwaving and grilling on the composition and nutritional quality of beef intramuscular fat from cattle fed with two diets was investigated. Longissimus lumborum muscle from 15 Alentejano young bulls fed on concentrate or pasture was analyzed. Cooking losses and, consequently, total lipids, increased directly with the cooking time and internal temperature reached by meat (microwaving > boiling > grilling). The major changes in fatty acid composition, which implicated 16 out of 34 fatty acids, resulted in higher percentages in cooked beef of SFA and MUFA and lower proportions of PUFA, relative to raw meat, while conjugated linoleic acid (CLA) isomers revealed a great stability to thermal processes. Heating decreased the PUFA/SFA ratio of meat but did not change its n−6/n−3 index. Thermal procedures induced only slight oxidative changes in meat immediately after treatment but hardly affected the true retention values of its individual fatty acids (72–168%), including CLA isomers (81–128%).     

9FA机组燃料清吹阀门动作故障分析与预防

本文针对GE 9FA燃机燃料清吹阀门动作故障现象进行分析,建立了阀门开启过程力学模型,分析阀门不同情况下的开启过程状态,从设备系统结构查找阀门动作时间变化的几种原因,发现气体燃料清吹阀门安装维护与设备系统存在的缺陷,为避免清吹阀故障和机组运行异常提出了相应的改进措施。     

重叠小区中移动IP切换算法的研究

首先简要介绍了MobileIP并分析了MobileIP的各种切换算法,然后通过仿真研究了重叠小区内结合链路层检测信息的积极和消极切换算法的性能,通过对仿真结果的分析,当移动节点进行慢速往返移动时,宜采用结合链路层检测的积极切换算法;而当移动节点往返移动的速度较高时,结合链路层检测的消极切换算法能提供更高的性能。     

馈线自动化技术

馈线自动化系统是配电自动化系统的重要组成部分,也是提高配电网供电可靠性的关键技术。本文介绍了馈线自动化的基本概念、系统的结构、通信技术和馈线自动化的远方终端及主站技术。文章最后介绍了美国纽约长岛电力公司（ＬＩＬＣＯ）的一个馈线自动化工程的实施情况。     

FA16网络中雷达信号传输质量分析

针对目前民航中南地区主要通过FA16的子速率数据接口板（SRX）进行整个民航中南地区所有雷达信号的引接和转发现状,根据FA16网络在日常运行中遇到的各种故障统计,对影响雷达信号传输质量的因素进行了归纳总结和深入分析,并对造成雷达传输故障的三个不同原因的最低质量阈值进行了研究,从而得到了影响雷达信号传输质量的根本因素,最后对提高雷达信号传输质量的保障能力进行了探讨。     

世纪之交话自动化仪表工业

文章分三个部分。第一部分讲述 ＤＤＺ－Ⅱ、Ⅲ型仪表的形成和４～２０ｍＡＤＣ国际统一信号的使用。第二部分讲述近２０年ＤＣＳ的广泛使用及ＰＡ、ＦＡ、ＯＡ的形成。第三段部分展望新世纪,指出市场对自动化仪表工业的需求和ＤＣＳ的发展。     

一种基于文本分析的带自学习的信息搜索机的设计

信息搜索是数字图书馆技术中较底层的部分,也是比较难于实现的部分。文章在充分考虑并运用现有的信息搜索技术的基础上,设计了一个针对文本的,有一定智能化的信息搜索机,最后进行了性能分析。