Determination of the content of wax esters in some sea foods and their molecular composition. A comparison with ω-3 enriched wax esters

Wax esters enriched in ω-3 fatty acids have been recently shown to be readily absorbed by rats after dietary supplementation. Wax esters are less prone to oxidation and can be better formulated than liquid ω-3 derivatives. All these characteristics suggest a possible use of wax esters enriched in ω-3 as food supplements. However, some naturally occurring wax esters are defined as scarcely digestible (jojoba oil, spermaceti). On the other hand, wax esters have been found in several sources of marine origin, which can enter normal foodstuff. In order to better understand the digestibility of wax esters, we have analysed some foods from marine sources. The content of triglycerides and wax esters of the foods has been determined. Moreover, wax esters have been analysed for their composition in alcohols and fatty acids. Wax esters have been shown to be a part of the neutral lipid extract of the foods analysed. Their content, if compared with the content in triglycerides, shows striking differences. In the case of two botargo preparations, it has been shown that wax esters are more than 90% of the total neutral lipid extract. The content of fatty acids and alcohols found in the foods analysed is consistent with published data.     

管道防腐层的失效及对策

介绍了管道防腐层失效的原因和方式。指出水和氧气是防腐层失效的原因,含水量和含氧量决定腐蚀程度,应采取有效措施对防腐层进行及时检查与修复。     

对供电损失率变动规律的分析与预测

通过对历史统计资料的研究,揭示出了供电损失率变动的基本趋势,得出预测的数学模型,同时也获得一种简捷计算供电损失率理论值的方法,便于从宏观角度掌握供电损失率,也可为供电损失管理部门决策提供参考。     

X荧光光谱法测定不锈钢的研究

本文论述了Ｘ荧光光谱测定高铬钢和不锈钢的分析方法，用理论α系数校正基体效应和用谱线干扰系数Ｌ校正谱线重叠影响。方法准确度和精度令人满意，操作十分简便、快速。     

摇臂参数设计方法

建立了中小功率内燃机常用摇臂参数化设计模型。采用可变参数构成摇臂结构，并作结构的有限元网络，此后再进行有限元分析，计算出摇的质量、刚度、转动惯量 力。使摇臂的设计归结为几个主要参数的优选。实例分析表明，计算值和实测值基本相符，优选出的摇避设计优于原设计。     

传感器可靠性技术—传感器可靠性特征量

介绍已知试验数据如何计算可靠性特征量的点估计和区间估计     

电站装备失效分析及其预防

简叙了电站装备失效分析程序、失效原因及其失效机理。大量的各种各样的失效，常常涉及一种或多种的失效机理。在众机理中，主要是：腐蚀失效、环境断裂失效、变形失效和断理解失效。     

Si3N4陶瓷材料高温氧化层的分析

利用ＸＲＤ，ＥＰＭＡ，ＸＰＳ和ＳＥＭ的分析方法，研究了在１３００℃下氧化后Ｓｉ３Ｎ４陶瓷材料表面氧化层的组成的形貌，结果表明，Ｓｉ３Ｎ４陶瓷材料的表面氧化层是由方石英相和含有Ａｌ２Ｏ３，ＣａＯ等杂质的ＳｉＯ２质玻璃相所组成，其中ＳｉＯ２玻璃相听Ａｌ２Ｏ３，ＣａＯ等杂质的含量随氧化时间的增加而逐渐增加，同时在氧化层的内部都还存在部分Ｓｉ２Ｎ２Ｏ相。     

70推土机主离合器分离杆螺栓失效分析

主离合器分离杆螺栓是一个重要安全件，使用中经常发生断裂。经过失效分析确定断裂原因是由其配件引起。提高配件的冷加工质量及改进结构，可解决分离杆螺栓的断裂问题。