线性烷基苯的光衰减长度测量及光吸收性能的改进

线性直链烷基苯(linear alkyl benzene,LAB)具有较高的光子产额和较长的光衰减长度,且环境友好,是大亚湾中微子物理实验理想的液体闪烁溶剂。为使工业化生产的LAB符合大亚湾中微子实验的使用标准,我们研制了改进型的光衰减长度测量系统,测量了一系列LAB样品的光衰减长度。实验结果表明,样品的杂质组分的差异是导致LAB光衰减长度优劣的主要原因。我们改进了生产工艺流程,减少LAB的杂质组分浓度,满足了实验要求。     

Effect of the stage of growth,wilting and inoculation in field pea (Pisum sativum L.) silages,III. Changes in the herbage and silage protein profiles

BACKGROUND: The effects of stage of growth, field wilting and inoculation with lactic acid bacteria (LAB) on the protein profile of herbage and silage were studied on field peas (Pisum sativum L.) harvested at four progressive morphological stages (end of flowering, I; beginning of pod filling, II; advanced pod filling, III; beginning of ripening, IV). The herbage was field wilted to a dry matter (DM) content around 330 g kg^?1, for each stage of growth. The unwilted and wilted herbages were ensiled with (I) and without (C) a LAB inoculant. RESULTS: As a result of the advancing maturity of the crop, the main protein component was Rubisco in the early stages and seed storage proteins in the more advanced stages, due to the redistribution of organic nitrogen during seed filling. Extensive degradation of Rubisco occurred in all the silages, without any effect of inoculation or wilting. A good preservation of the proteins was observed in stage IV for both unwilted and wilted silages, without further protein preservation due to LAB inoculation. CONCLUSION: Protein protection observed in the more mature pea silage was due to the protein type and its localization and not to the level of DM at ensiling or to the inoculation. Copyright © 2007 Society of Chemical Industry     

Inhibitors of lactic acid fermentation in Spanish-style green olive brines of the Manzanilla variety

Frequently, a delay or lack of lactic acid fermentation occurs during the processing of Spanish-style green olives, in particular of the Manzanilla variety. Many variables can affect the progress of fermentation such as temperature, nutrients, salt concentration, antimicrobials in brines, and others. In this study, it was demonstrated that an inappropriate alkaline treatment (low NaOH strength and insufficient alkali penetration) allowed for the presence of several antimicrobial compounds in brines, which inhibited the growth of Lactobacillus pentosus. These substances were the dialdehydic form of decarboxymethyl elenolic acid either free or linked to hydroxytyrosol and an isomer of oleoside 11-methyl ester. Olive brines, from olives treated with a NaOH solution of low concentration up to 1/2 the distance to the pit, contained these antimicrobials, and no lactic acid fermentation took place in them. By contrast, a more intense alkaline treatment (2/3 lye depth penetration) gave rise to an abundant growth of lactic acid bacteria without any antimicrobial in brines. Therefore, the precise cause of stuck fermentation in Manzanilla olive brines was demonstrated for the first time and this finding will contribute to better understand the table olive fermentation process.     

高产Nisin和高产LAB EPS乳酸菌共生株筛查

通过对10株产Nisin乳酸菌株和10株产LAB EPS乳酸菌株进行培养、筛选和测定,筛选出3株高产Nisin的乳酸菌株和3株高产LABEPS的乳酸菌株,进而对3株高产LAB EPS乳酸菌株和3株高产Nisin乳酸菌株进行复合发酵试验,最终筛选出可共生的高产Nisin乳酸菌株和高产LAB EPS乳酸菌株各1株。     

镭射复合材料表面呈色性能的检测与分析

应用Matlab软件绘制出一种镭射复合原材料以不同入射角、反射角观察时的分光反射率分布曲线以及xy色度图、LAB色度图,直观分析了该材料表面的呈色性能,即镭射复合材料上固定的点在不同角度下呈现不同的颜色和较高的光泽度.并进一步探讨了其印刷产品色差检测的研究方法.     

基于RT-LAB的柔性直流配电保护系统的硬件在环测试

基于PSCAD/EMTDC等纯数字仿真软件对柔性直流配电保护系统进行的研究不能真实模拟保护装置的响应特性、也不便于保护方案的开发和扩展。鉴于此,通过实时数字仿真器RT-LAB以及保护装置的无缝连接,在国内首次搭建出基于深圳典型四端柔性直流配电网的硬件在环测试平台。该平台采用独有的e HS技术解决了实时模拟高频直流变压器的难题,可显著提升测试的时效性和实用性,具有较高的置信度。利用该平台对柔性直流配电网的三种典型故障进行了硬件在环故障测试,验证了所配置保护策略的性能。结果表明:所配置的保护方案功能全、性能好,在故障时动作准确可靠,无死区;实验结果可以直接应用到一次动模实验中,可为柔性直流配电工程的建设研究提供参考。     

铅酸蓄电池的过去、现在和未来

本文为保加利亚科学院院士D．Pavlov教授于1996年10月下旬在青岛大学所作报告的介绍之一，着重分析了铅酸蓄电池的发展前景并指出了研究方向。     

Assay on FAQ''s on Total Lab Automation

The purpose of the introduction of an automated laboratory system in one format or another is reducing the costs of the laboratory by cutting staff. Also speeding up the performance often is a goal. At the same time it is planned to increase the quality of the work done by using automated labelling and reading of documents. The use of vacuum tubes and the handling of these by the apparatus are raising the safety of the labwork.

In this paper many aspects of the daily routines when using a TLA system are discussed. The aspects are collected during the discussions before and after the implementation of the Roche CLAS system in our laboratory. Some consequences were foreseen, and others came unexpectedly. But still the subjects form a point of discussion around the TLA systems. The most important message to be picked up is that one really has to consider all possible problems that could arise from the implementation of TLA.     

基于WEB的计算机网络实验CAI系统的设计

针对高校大规模扩招与实验教学设施数量不匹配及实验教学管理量增加的普遍现状,采用B/S模式架构,按照Web实验环境的提供和实验教学辅助管理两大功能,开发了基于ASP.NET技术的实验教学辅助管理系统。经过数年的实践,取得了良好的教学效果。