气相色谱在线分析变压吸附法制纯氢中的总碳

利用带镍加氢转化炉的气相色谱仪 ,在线分析变压吸附法制纯氢中的总碳。该法用变压吸附法制的纯氢作燃气 ,在检测器前端将氢气中的CO和CO2 转化为CH4,然后用氢火焰离子化检测器检测 ,直接以检测器的信号 (mV)进行定量。当氢气中总碳体积分数在 1 9～ 5 0 0 μl/L时 ,FID信号值与总碳体积分数有良好的线性关系。方法回收率为 99 90 %～ 10 1 9%,相对标准偏差 <1%。     

Viscoelasticity of oxidized starch/low methoxy pectin mixtures in the presence of glucose syrup

The structural properties of mixtures of pectin, oxidized starch and glucose syrup were investigated using small deformation dynamic oscillation. In the absence of added calcium, preparations of low methoxy pectin with glucose syrup formed viscous solutions, which remained crystal-free at subzero temperatures. Samples of oxidized starch and glucose syrup, on the other hand, exhibited solid-like behaviour because of the crystalline nature of the amylose-like helices. Mixtures of the two polysaccharides with the co-solute clearly showed phase inversion from liquid to solid-like behaviour with increasing amounts of starch in the formulation. The transformation was reflected in the textural properties of samples, which varied from thick solutions to firm gels. The viscoelasticity of the system was modified further by the introduction of high methoxy pectin. Preparations of high methoxy pectin and glucose syrup formed rubbery gels whose amorphous nature underwent a glass transition during cooling.     

高温高压下多种气体在储层岩心中吸附等温线的测定

利用自行研制的XF1型高温高压气体吸脱附测试仪,结合一台色谱分析仪(HP6890),一套抽真空系统,分别测定了N₂、CH₄、C₂H₆、C₃H₈、nC₄及其混合气体在三个岩心中的吸脱附等温线共计42条(单组分30条,累计测试点516个;混合气12条,累计测试点203个),以及吸附平衡后混合气的自由气相组成、吸附相组成和各组分的吸附等温线各48条(累计测试点431个).测试的温度为50.5℃.实验结果表明:①储层岩心介质对烃类气体的吸附现象是客观存在的,不容忽视;②仅就测试所得的数据来看,如果忽略其它因素,可以初步估计,不考虑吸附的砂岩储层气藏的计算储量将比考虑吸附少5%以上;③岩心-气体吸附体系的吸附能力除受压力影响外,更受到储层介质、岩石成分、结构和物性性质的影响,除此之外,还受到多组分气体中重烃组分数目、摩尔含量等的影响;④多组分气体组分相对吸附量能有效地表征多组分气体中各组分气体的竞争吸附能力大小,依据这个指标可将五元多组分气体体系中各组分气体按其竞争吸附能力由强到弱排序为nC₄>C₃H₈>C₂H₆>CH₄>N₂.     

基于PLC电液比例控制的液力测功装置开发及其应用

本文介绍一种齿轮动态加载试验规范及技术要求，论述了运用电液比例控制技术所设计的液压加载系统原理及其使用效果，并简述由此构造的液力测功装置的原理与应用前景。     

Transient Green’s Tensor for a Layered Solid Half-Space With Different Interface Conditions

Pulsed ultrasonic techniques can be and have been used to examine the interface conditions of a bonded structure. To provide a theoretical basis for such testing techniques we model the structure as a layer on top of a half-space, both of different elastic properties, with various interface bonding conditions. The exact dynamic Green’s tensor for such a structure is explicitly derived from the three-dimensional equations of motion. The final solution is a series. Each term of the series corresponds to a successive arrival of a “generalized ray” and each is a definite line integral along a fixed path which can be easily computed numerically. Willis’ method is used in the derivation. A new scheme of automatic generation of the arrivals and ray paths using combinatorial analysis, along with the summation of the corresponding products of reflection coefficients is presented. A FORTRAN code is developed for computation of the Green’s tensor when both the source and the detector are located on the top surface. The Green’s tensor is then used to simulate displacements due to pulsed ultrasonic point sources of known time waveform. Results show that the interface bonding conditions have a great influence on the transient displacements. For example, when the interface bonding conditions vary, some of the first few head waves and regular reflected rays change polarities and amplitudes. This phenomenon can be used to infer the quality of the interface bond of materials in ultrasonic nondestructive evaluation. In addition the results are useful in the study of acoustic microscopy probes, coatings, and geo-exploration.     

动态光散射法研究海藻酸钠凝胶松弛行为

在前文的基础上，用相关函数轮廓分析的方法剖析了运动模型模式的复杂性。通过海藻酸钠水溶液在０．１ｍｏｌ／ＬＣａＣｌ２水溶液透析凝胶化过程中交联网络的松弛时间谱表明它不是单一的峰，有两上特征运动模式，并随透析向更慢的运动模式发展，这很慢的运动模式估计与区域的结构的生成有关。     

热释电系数的测量方法

描述热释电系数的两种测量方法。其一为电荷积分法，测试系统简单，测量数据准确，且能满足零电场条件下的测量。其二为动态电流法，采用调制热源技术，研究在特定温度条件下热释电材料的动态热释电响应。     

风机叶轮的现场平衡方法

介绍了利用简单方法，解决风机叶轮现场静、动平衡的问题。方法快速、准确、实用。     

天然气的储存

随着能源结构的调整,天然气在一次能源中的比重逐步增大,天然气的储存成为人们日益关注的课题,作者就此作一综述。