Dietary fibre of coconuts from a pacific atoll: Soluble and insoluble components in relation to maturity

Polysaccharide fractions were measured in coconuts at three stages of maturity, which corresponded to dietary usage in the Tokelau Islands of the South Pacific. Kernel was sequentially extracted with cold water (CW), hot water (HW) hot 0.5% ammonium oxalate (HOX), 1M H² SO⁴ and 72% H² SO⁴, and the monosaccharide compositions of the fractions determined. Total readily soluble fractions (CW+HW+HOX) were predominantly galactomannan, and decreased from 77% of the polysaccharide in the immature kernel to 8.8% of that in the mature kernel. Insoluble mannan increased during maturation to be the major polysaccharide component in mature kernel. This indicates that marked differences exist between the three stages of maturity examined, in the properties of their dietary fibre. The results suggest that in studies of diets in which coconut is a staple part, there is a need for careful definition of the coconut component with respect to maturity. Furthermore, they show the importance of using dietary fibre methods which are appropriate to the solubility characteristics of the indigestible polysaccharide.     

UV-固化光纤色标油墨

报导了一类新型的化学功能材料———ＵＶ固化光纤色标油墨。该材料由可ＵＶ固化的有机硅环氧安息香酸丙烯酸酯（ＳＥＢＡ）和脂环族环氧丙烯酸酯（ＡＣＥＡ）两种光敏预聚物为基料，以自行合成的光敏染料———分散红氨基甲酸酯丙烯酸酯（ＲＵＡ）、分散蓝氨基甲酸酯丙烯酸酯（ＢＵＡ）和吖啶黄氨基甲酸酯丙烯酸酯（ＹＵＡ）为着色剂，加入必要的添加剂配制而成的ＵＶ固化光纤色标油墨。该色标油墨已在光纤生产中得到应用。     

掺饵光纤放大器用1480 nm/1550 nm波分复用器的优化设计

以组合波导理论为基础，分析了1480/1550 nm波分复用器的耦合区横截面形状和尺寸与偏振灵敏度的关系。着重比较了矩形截面和椭圆形截面二种波分复用器的偏振性能，并发现当椭圆截面的短轴与长轴之比为1:1.88时，器件性能几乎与偏振无关。研制成功的1480/1550 nm波分复用器的波长隔离度大于20 dB,偏振灵敏度小于0.1 dB,附加损耗小于0.5 dB。     

POM晶体倍频相位匹配角的设计及应用

计算了新型有机晶体ＰＯＭ的倍频匹配角，并将ＰＯＭ作为倍频器件用于超短光脉冲的测量中。     

一种新型有机非线性光学材料的光折效应及其产生机理

本文介绍了一种新近研制的光折聚合物。实验表明，除去吸收和反射，入射光束经聚合物后的第一布拉格衍射效率高达８６％，材料也显示出双光束耦合的净增益高于２４０ｃｍ＾－１。这些结果表明，这种新型研制的光折聚合物材料是替代无机光折晶体的实用材料。     

Comparison of interfaces in Ti composites reinforced with uncoated and TiB2/C-coated SiC fibres

Interfaces play an important role in determining the mechanical properties of composite materials. The interfaces established between a titanium-alloy matrix (Ti-6Al-4V) and uncoated and TiB₂/C-coated SiC fibres are analysed by scanning electron microscopy, transmission electron microscopy and X-ray techniques. Emphasis is placed upon the interfacial morphology and microstructure, identification of reaction products, and the stability of the coating layer. Complex multi-reaction layers are observed frequently in the interfacial zones. Previous, often contradictory, reports about the interlayers are reviewed. Experimental observation demonstrates that the type and distribution of interlayers vary in a given system, due to prolonged treatment of the samples at temperature. The formation and distribution of the interlayers are discussed further, with respect to these and previous findings. Methods of reducing interfacial reactivity are discussed.     

低空大气对连续波干涉仪系统相位稳定性的影响

针对三站连续波干涉仪系统，根据实时测得的系统场区大气折射率漂移数据，应用几何光学方法，从理论上估计了连续波干波仪系统两条微波基线传输的相位稳定性。     

分布式光纤测温在动力电缆温度监测中的应用

动力电缆温度监测是可以及时发现电缆线路过热点位置和检测运行线路的绝缘状态,从而保障电缆安全稳定运行的技术措施。针对电缆过热事故的主要原因和特点,提出采用分布式光纤测温技术对电缆沿线温度进行监测预警,给出了分布式光纤测温系统的原理、组成和光缆布设方案,此系统对保证电力系统的安全运行有重要意义。     

矿用隔爆兼本安型计算机信号隔离器设计

针对煤矿井下电气设备要求本质安全的特点,设计了一种矿用隔爆兼本安型计算机信号隔离器,主要介绍了该隔离器的硬件电路设计。该隔离器主要用于矿井中本质安全型计算机主机与外部输入输出设备的连接,能够实时地传送键盘输入的数据,具有良好的信号隔离功能和抗干扰性能。