浅谈天馈线电压驻波比对微波电路的影响

天馈线电压驻波比是微波电路运行的重要指标，通过典型事例来阐述天馈线电压驻波比的劣化对微波电路的影响，并根据多年实践经验提出天馈线维护需注意的事项。     

硬度匹配对40CrNiMo滚子接触疲劳性能的影响

通过对“软－软”、“中－软”、“中－中”、“中－硬”四组不同硬度匹配的滚子接触疲劳试验得出四条Ｐ－Ｎ曲线。并发现中硬度材料的接触疲劳寿命高于软材料，而当主试样为中硬时，与之相匹配的陪试件硬度越高，主试样的寿命越短，通过分析讨论解释了产生上述现象的原因及其失效机理。     

Approximating the problem, not the solution: An alternative view of point set matching

This work discusses the issue of approximation in point set matching. In general, one may have two classes of approximations when tackling a matching problem: (1) an algorithmic approximation which consists in using suboptimal procedures to infer the assignment, and (2), a representational approximation which involves a simplified and suboptimal model for the original data. Matching techniques have typically relied on the first approach by retaining the complete model and using suboptimal techniques to solve it. In this paper, we show how a technique based on using exact inference in simple Graphical Models, an instance of the second class, can significantly outperform instances of techniques from the first class. We experimentally compare this method with well-known Spectral and Relaxation methods, which are exemplars of the first class. We have performed experiments with synthetic and real-world data sets which reveal significant performance improvement in a wide operating range.     

A comparison of lightness contrast effects in CRT and surface colours

The simultaneous contrast effect is investigated in this article. A total of 174 and 154 test/induction combinations were studied for CRT and surface colours respectively. Each combination was assessed by nine observers using a matching technique. The test and induction colours used for CRT colours were similar to surface colours using fabric samples. The results indicated a strong lightness contrast effect for both CRT and surface media; that is, the lightness of a test colour surrounded by a lighter induction colour was reduced for both CRT and surface colours. However, the effect in CRT medium was more pronounced than in the surface medium. © 2004 Wiley Periodicals, Inc. Col Res Appl, 30, 13–20, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/col.20074     

Motion compensated film restoration

Motion picture films are susceptible to local degradations such as dust spots. Other deteriorations are global such as intensity and spatial jitter. It is obvious that motion needs to be compensated for before the detection/correction of such local and dynamic defects. Therefore, we propose a hierarchical motion estimation method ideally suited for high resolution film sequences. This recursive block-based motion estimator relies on an adaptive search strategy and Radon projections to improve processing speed. The localization of dust particles then becomes straightforward. Thus, it is achieved by simple inter-frame differences between the current image and motion compensated successive and preceding frames. However, the detection of spatial and intensity jitter requires a specific process taking advantage of the high temporal correlation in the image sequence. In this paper, we present our motion compensation-based algorithms for removing dust spots, spatial and intensity jitter in degraded motion pictures. Experimental results are presented showing the usefulness of our motion estimator for film restoration at reasonable computational costs. Received: 9 July 2000 / Accepted: 13 January 2002 Correspondence to:S. Boukir     

计算机配色技术应用于木材染色初探

介绍了计算机测色配色系统的原理,研究了建立木材染色基础数据库的方法,提出了注意事项,并分析了自动配色过程中产生色差的原因及解决方法。     

空气钻井条件下录井工艺方法与技术配套探讨

针对玉门青西油田深部高陡易斜地层存在可钻性差、自然造斜能力强，致使钻井周期长、成本高等特点，中油集团公司在吐哈油田设立钻探“工程探索井（L14井）”重大科研项目，试验研究空气钻井技术。根据L14井录井的实际情况，首先分析了空气钻井条件对录井带来的影响和常规的录井工艺方法和技术设备存在的不足；从5个方面介绍了录井工艺、技术方法的改进，探讨了空气钻井下的岩屑上返理论；介绍了配置装备的改进，分析了该井录井配套技术的应用效果。从该试验井的录井效果看，经改进的录井工艺、方法及装备基本上能满足空气钻井的需要，取全取准了地质及工程资料，为地质解释和评价提供了可靠依据；在工程监测、保障施工安全方面，工程录井也发挥了作用。但综合录井仪软件及后台评价程序还不适应空气钻井的需要，相关的理论研究及工艺完善还有许多课题尚需深入。     

紧凑式换热面瞬态实验中的全程直接配比法

在紧凑式换热面的瞬态实验中，为获得准确的实验结果，不仅要建立符合试验工况的理 论解，而且还要选择合适的配比方法，以便尽可能减小测量误差对配比结果的影响．本文就瞬态实 验的配比，提出了一种新的基于计算机的全程直接配比法，由于它采用了所有可用测试点进行配 比并且其理论解与实测值的配比误差是通过最小搜索步长来控制的，因此，实验结果的准确性和 可靠性优于通常应用的间接配比法和选点配比法．