The application and research of high-frequency ultrasonic reflection technique used in the measurement of small diameter’s tube cavity size

Based on the problems that the photoelectric detection method and the X-ray testing method cannot provide the ideal accuracy when they are applicated to detect the cavity of small workpiece with diameter Φ6 mm and the general probes cannot stretch to the internal of the workpiece, we propose a high-frequency ultrasonic reflection technique which is used to measure the cavity size of diameter tube. The method uses ultrasound to measure the thickness. It can extract information about the wall size of workpiece through signal processing, feature extraction and other methods. By using this information, we can measure the size of cavity. Compared with the test results showed by a venire caliper and screw micrometer, we can get the conclusion that the immersion focusing probe with center frequency of 10 MHz can accurately detect the cavity of the workpiece. The experiment shows that the method gives consideration to the accuracy and computational efficiency of the workpiece’s cavity parameters. It can get data supplely and effectively. There are other advantages of this method such as stable performance, easy installation, and lower power consumption and penetration ability. It is suitable for the precision measurement of the workpiece.     

The use of peel tests to examine the self adhesion of polyimide films

Peel tests were used to examine the adhesion between two layers of the polyimide pyromellitic dianhydride-oxydianiline (PMDA ODA). The main thrust of this work was to examine these tests with particular emphasis on yielding in bending of the peeled strips. Two peel geometries and a range of sample thicknesses were used to study interfaces whose strength could be varied over a wide range by changing the cure schedule. The peel strength varied with strip thickness and often reached a peak at an intermediate thickness. The results were shown to agree qualitatively with a combination of two theoretical models for the effects of yielding on peel tests. It was also found that a second problem of polyimide adhesion, the effect of solvent swelling, could significantly enhance the adhesion between polyimide layers.     

混合絮凝及周进周出沉淀池工艺设计

旺隆污水处理厂二期工程中,一级处理采用混合、絮凝、沉淀池工艺。设计采用机械混合、网格反应和周进周出矩形沉淀池的优化和改良方案,能够明显改善对悬浮物及胶体有机物的处理效果,减少后续构筑物的处理负荷和处理费用。     

铝连续铸轧机辊缝调节装置的有效使用

辊缝调节装置在铝连续铸轧机中起着重要作用。通过具体工程实例对辊缝调节装置的使用进行了表述,并通过计算,描述了辊缝调节的正常使用,为了保证生产的正常运行及产品质量的稳定性,强调在轧制过程中要正确使用辊缝调节装置。     

水库下游河床粗化计算模型

根据泥沙起动及河床粗化理论公式，建立了水库下游河床粗化数学模型，以研究水库下游河道极限冲刷深度及粗化层级配，该模型计算简捷方便，通过实例计算结果分析，与一维数模计算成果比较及实际资料验证等级结果表明，该模型计算结果合理，可靠，对研究水库下游局部河段冲刷，具有重要意义。     

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气井临界水饱和度是指在工业气流产量下限时所对应的最大含水饱和度。确定气井临界水饱和度对划分气井有效厚度、计算储量都是非常重要的，它不仅与测试产能有关，而且和岩石孔隙结构（反映在相对渗透率上）有关。储层孔隙结构越好，测试产能越高，临界水饱和度越高，其对应的有效孔隙度下限越低。采用试井原理并结合相对渗透率资料，通过迭代试差法可求取气井临界水饱和度，进而确定气井含气饱和度与有效厚度。该方法已在川东多个石炭系气藏中使用，取得了较好效果     

等壁厚定子螺杆泵研究及应用前景探讨

为了改善常规螺杆泵的使用性能和提高其系统效率 ,开发研究了等壁厚定子螺杆泵。国内外等壁厚定子螺杆泵的研究与应用表明 ,与常规螺杆泵相比等壁厚定子螺杆泵具有以下优点 :( 1)良好的散热特性 ,提高了泵的工作寿命 ;( 2 )均匀的橡胶膨胀 ,提高了泵的工作稳定性 ;( 3)单级承压高 ,提高了系统效率 ;( 4 )可提高泵效 ,降低采油成本 ,具有良好的技术经济指标。这种螺杆泵的技术关键是定子泵筒的加工工艺及焊接问题。     

储层岩性高分辨率地震资料精细解释技术初步探讨

普遍采用基于不同算法的预测软件利用高分辨率地震资料进行储层预测，预测结果除受地震资料的频率和保真度影响外，主要受软件本身算法的影响。无论哪 种软件，其算法主要是数学原理，缺少地质信息，使其结果具有多解性，往往不符合地质规律。     

Quasi‐static analysis of microstrip lines with variation of substrate thickness in transverse direction

This article is devoted to the analysis of microstrip lines printed on dielectric substrates with transversely varying thickness using the quasi‐static approximation and the method of lines. Discretization lines of varying length, according to the layer thickness, are used and only the Laplace wave equation has to be solved. The numerical results presented herein permit the illustration of the effect of arbitrarily curved substrate interfaces along the transverse direction on the characteristics of the microstrip structures under consideration. The behavior of the per unit length parameters of these structures as a function of the shape of these substrates' cross section is studied in depth. Furthermore, the effects of the finite metallization thickness and losses are also investigated in detail. The results that are obtained are consistent with those published in the literature. © 2003 Wiley Periodicals, Inc. Int J RF and Microwave CAE 13: 194–205, 2003.     

影响汽车内饰用ATY质量因素的探讨

根据多年的科研和生产实践,详细讨论了影响汽车内饰用ATY质量的主要因素,并提出相应的改进技术和管理措施。