天线远场散射特性计算模型的分析研究

研究了天线散射特性的仿真计算问题,重点对天线所特有的模式项雷达散射截面积(RCS)进行了分析与计算。首先从天线的散射机理出发,给出了天线散射分析的流程,分析比较了三类典型的天线散射分析方法,并以微带天线为例,采用三类典型的天线散射分析方法,分别得到了天线结构散射截面积和天线模式散射截面积,证明了三类散射分析方法的一致性和正确性。仿真结果为进一步分析研究天线目标的宽带散射特性及对天线的检测和识别问题奠定了基础。     

自动识别系统ATR的测角精度研究

介绍了TCA2003全站仪的自动目标识别(ATR)系统及其功能，研究了自动识别系统在实际应用中的测角精度及其可靠性。基于试验的目的，选择了不同的试验场地和方法，详细分析了ATR的测角精度以及环境对测角质量的影响，比较了传统的人工测角与ATR测角的可靠性，获得了有益的结论，对开拓ATR测量仪器的应用范围具有指导作用。     

Application of FTIR in direct methanol fuel cells – Quantitative analysis of PTFE in gas diffusion layers

Gas diffusion layers (GDLs) of direct methanol fuel cells (DMFCs), consisting of a microporous layer (MPL) and a back layer (BL), influence the cell performance and stability significantly due to the critical function that the GDL undertook, i.e., distribution of reactants and removal of the products in electrodes. The hydrophilic/hydrophobic properties of the GDLs are required to tailor to the transport/transfer of reactants/products depending on a specific electrode reaction. One important way to adjust the hydrophobic/hydrophilic properties of GDLs is to vary PTFE content in GDLs. In this paper, we employ infrared spectroscopy technique, specifically, diffuse reflection (DR) method and attenuation total reflection (ATR) method, to determine the PTFE content in both MPLs and BLs quantitatively by comparing the measured C-F intensity with the pre-calibrated standard plots. Compared to the ATR method, the DR method takes advantages of sensitivity, wide range and precision. By the DR method, we succeed in observing that PTFE in MPLs migrates to BLs, consistent with the corresponding EDX results for a sample experienced 600 h lifetime test, suggesting DR method an effective approach to determine quantitatively the hydrophilic/hydrophobic properties of both MPLs and BLs.     

Fuel cell feed system based on H2 production by a compact multi-fuel catalytic ATR reactor

Hydrogen fuel cells seem the most viable solution to the pollution reduction and the energy growing demand. Very compact and small size production plant for distribute H₂ production may reduce hydrogen transport and storage difficulties. Due to the high reactor compactness and thermal self-sustainability, the auto-thermal reforming (ATR) reaction of gaseous and liquid hydrocarbons can be the optimal solution. Fossil hydrocarbons like methane, gasoline and diesel still remain the favourite feed for catalytic auto-thermal reformer, due to the widespread existing delivery pipelines and the high energy density. Unfortunately, due to the different characteristics of liquid and gaseous fuels, it's very difficult to realize a multi-fuel processor characterized by high performances in terms of thermal efficiency and hydrogen yield, and, up to now, very low number of papers dealing with multi-fuel reformers is present in the literature.     

Extraction of Three-Dimensional Motion and Geometric Invariants from Range Dependent Signals

The theory needed to extract three-dimensional size, shape, and motion of a rigid moving body from a series of range-only measurements is explained. For a rigid body, moving with arbitrarily complex, unknown motions, the three-dimensional size and shape of a configuration of points on the body can be calculated from the range data, without any prior knowledge of the geometry of the configuration. The calculations are possible because there exist motion-invariant functions of the range data, which uniquely determine the Euclidean geometry of the points. This theory is shown to work on synthetic range data. When the synthetic data is corrupted by noise the process is shown to still produce reasonable results.     

用天然气制合成气代替ATR转化气优化乙炔尾气甲醇装置运行研究

四川维尼纶厂现有一套10万t/a的基于天然气蒸汽转化的甲醇合成装置和一套77万t/a的乙炔尾气甲醇合成装置。天然气蒸汽转化制备的合成气惰性气体含量低,氢含量高,而乙炔尾气甲醇装置ATR转化气惰性气体含量高。在深入分析两种合成气的特性的基础上,提出了以天然气制备的合成气替代乙炔尾气甲醇装置的ATR转化气,降低合成环路惰性气体含量、优化合成气气质、改善产品质量、提高甲醇产量的可工程实施的优化运行方案。     

Spraying of liquid fuel for improvement of reforming performance for hydrogen generation

In the present study, the effects of spraying conditions on reforming performance were investigated experimentally. Kerosene was used as the liquid fuel for reforming and sprayed by a twin fluid nozzle to facilitate uniform mixing with air and water (steam) at the downstream. The separate effects of the mean drop size of the fuel, the position of the catalytic bed and the air flow rate on the reforming efficiency were analyzed, and the reasons for the results were discussed by examining the temperature distribution inside the reformer and also through visualization of the catalytic bed during the reforming process. The overall reforming efficiency was significantly improved by spraying the fuel because the mixing between the reactants was enhanced. When the distance from the nozzle to the catalytic bed became closer, higher reforming performance was achieved with larger fuel drops due to the more rapid penetration into the catalytic bed with larger momentum. With a larger amount of air supply to the system, fuel reformation was promoted by the high reaction temperature. On the other hand, with the longer distance between the nozzle and the catalytic bed, the poor mixing between the fuel and other reactants (due to the side-wall collision of fuel drops and possible formation of liquid film along the wall) predominated over other effects, and the drop size effect was not accordingly observed.     

碱性果胶酶精练棉针织物表面红外光谱分析

为便于研究碱性果胶酶在棉织物精练中的效果,对傅里叶红外衰减全反射光谱(FT-IR ATR)评价棉针织物精练效果的可行性做论证。试验结果表明,采用盐酸蒸汽处理后的棉针织物可以采用FT-IR ATR评价其精练效果。利用FT-IR ATR法对比分析了碱精练和碱性果胶酶精练效果。图谱分析结果表明,棉针织物采用碱性果胶酶精练取得良好的精练效果,与碱精练效果接近。FT-IR ATR法为棉针织物碱性果胶酶精练研究提供了一种新型的可行方法。     

聚氨酯脲的表面组成及结构

用ＡＴＲ－ＦＴ－ＩＲ和ＸＰＳ研究了聚氨酯脲以及聚二甲硅氧烷改性聚氨酯脲的表面组成和结构,发现与空气接触面和与模板接触面含有的ＰＤＭＳ和聚四亚甲基醚软段浓度远远大于其体体浓度,并且与空气接面比与模板接触面含有更多的ＰＤＭＳ和ＰＴＭＯ段。将聚酯脲水合至３个星期,其表面组成和氢键未发生任何变化。     

傅里叶变换红外光谱衰减全反射谱研究聚氨酯和聚脲

用傅里叶变换红外光谱(FTIR)衰减全反射谱(ATR)研究了溶液聚合的四种模型嵌段聚氨酯(聚氨酯-氨酯、聚脲-氨酯、聚氨酯-脲和聚脲-脲)。用ATR谱说明了在硬段微区和硬段微区软段微区的相界面区,不同键对这些聚合物热性质和力学性质的影响,并详细讨论了ATR谱的羟基C=O、醚氧键C—O—C、酰胺Ⅱ谱带及氢键的情况。