Probabilistic linear models for multiresolution estimation in gray-level images

A multiresolution analysis of digital gray-level images is presented. A gray-level multi-scale framework is determined from two main assumptions: the gray scale is binary at the finest spatial resolution, and the gray levels of composed regions are obtained additively. In order to interrelate the gray-level histograms of the same image at different resolutions, probabilistic linear models are developed, which are then applied for estimation. Linear-optimization theory is used as a way of constructing such models. A general procedure for image processing is sketched, based on gray-level estimation. A versatile algorithm for nonlinear filtering is derived. Some examples of prospective applications are given.This work was partially supported by grant TIC91-646 from the DGYCIT of the Spanish Government.     

Early detection of ageing in solder joints through laser probe thermal analysis of the peltier effect

We have recently developed an optical contactless method for testing the quality of solder joints during accelerated thermal cycling ageing processes.¹ The method was based upon the measurement of the dynamic thermal behaviour of the joint to short bursts of Joule heating. It has proved to be efficient in revealing the formation of cracks at the lead-solder interface. We present a method to evaluate ageing at a much earlier stage in the cycling process. We have observed in earlier work,¹ that before cracks appear, structural changes occur in the solder at the lead-solder interface. The thermal response of the solder joint is recorded over time to a Peltier heat perturbation produced by flowing a current pulse through the interface where structural changes occur. The key point in this method is to discriminate the Peltier effect from the Joule thermal response because both effects generate heat. The variation of the early Peltier response in the thermal cycling ageing tests is seen as a quantitative signature of the structural changes in the lead-solder interface.     

铝合金铁相团球化熔剂的研制

研制了一种铝合金铁相团球化熔剂，在含铁量较高（１．０％－４．０％Ｆｅ）的铝合金中加入该熔剂后，可使针片状的铁相变为团球状或颗粒状组织。从而大幅度提高原合金的机械性能，δｂ和δ分别提高２０％－９０％和４０％－１００％。生产实验表明：该熔剂团球化效果好（具有长效性），极便于在生产中推广应用。     

深井重泥浆弱凝胶工艺技术初探

重泥浆强凝胶体系对钴井会产生不利影响。笔者结合川东地区的实际情况,分析了重泥浆强凝胶形成的原因和重泥浆弱凝胶的形成机制,提出了形成重泥浆弱凝胶体系的核心和设计原则,总结出了一套以正确使用泥浆添加剂并配合强有力的固控措施为主的成套深井重泥浆弱凝胶工艺技术,介绍了这套技术在川东地区的应用情况。实践证明,少用甚至不用泥浆降粘剂就可获得并维持尽可能低的静切力,使τ_s,10s为0.5—6Pα、τ_s,10min为2—12.5Pα。     

用扫描电镜判断火工药剂与金属桥丝长期接触的相容性

火工药剂与金属桥丝接触，在高温、高湿条件下贮存一定时间后两者是否相容，用电镜观察其金属表面的腐蚀形态（面积、深浅），以此来判断金属桥丝与火工药剂的相容性。     

MPC系统模块结构中的流场研究

本研究中,应用Simple数值计算方法开发了求解MPC系统模块结构中二维流场分布的计算软件。为了验证计算结果的精确性,用多普勒测速仪实测了用有机玻璃制成的MPC模块二维模型的流场,模拟计算结果与实测值对比取得了较好的一致性。四种不同流出角的MPC模块平均总压损失计算结果表明,已开发的软件可作为设计低流阻MPC模块的良好工具。     

瀑布沟工程的水文分析计算

本文简要的介绍了瀑布沟工程水文分析计算主要依据站的选定和基本资料的插补延长,以及径流、洪水的分析计算方法.在可行性研究阶段水文成果(通过审查)和新设立的毛头码水文站所取得的数年水文资料的基础上,将初设阶段对可行性研究阶段的水文分析计算方法和成果进行验证和补充的情况重点予以介绍.     

我国力车胎行业现状与展望

介绍了2002年我国力车胎的行业现状。近年的发展及展望。并着重描述了力车胎专用设备的新发展。     

新型难燃输送带胶粘剂的研制

以改性氯丁橡胶为主料、多异氰酸酯为固化剂制成的新型难燃输送带胶粘剂,具有粘接强度高、耐热性好、干燥时间短、难燃等特点,在常温常压下粘接输送带接头,固化30min即可负荷运行。     

一种新型硫酸亚铁单液法调剖剂

本文提出用尿素作为ｐⅡ调节剂，加快硫酸亚铁单液法调剖剂中亚铁离子在地层温度下的沉淀，增大沉淀率，提高封堵效能。岩芯流动试验结果表明，１５％ＦｅＳＯ４．７ＩＩ ２Ｏ／５％尿素调剖剂体系的封堵能力比不含尿素的体系增大近一倍。