《Rapid Alignment Mirror Mounts》

  • 来源专题:光电技术研究所所级服务
  • 编译者: feng22051010
  • 发布时间:2016-04-16
  • Previous Next Products Index. . Rapid Alignment Mirror Mounts. 12Apr2016. Optical Surfaces Ltd designs and manufactures a wide range of mounts for use with mirrors to optimize their optical performance. Ultra-high precision mirrors are useless unless they are positioned with absolute precision and are maintained stress-free. The OS-Z range of mirror mounts from Optical Surfaces Ltd. provide ultra stable, stress-free mounting and rapid alignment of off-axis parabolic, sph...

相关报告
  • 《Aging and the effect of target-masker alignment》

    • 来源专题:水声领域信息监测
    • 发布时间:2016-11-25
    • Similarity between target and competing speech messages plays a large role in how easy or difficult it is to understand messages of interest. Much research on informational masking has used highly aligned target and masking utterances that are very similar semantically and syntactically. However, listeners rarely encounter situations in real life where they must understand one sentence in the presence of another (or more than one) highly aligned, syntactically similar competing sentence(s). The purpose of the present study was to examine the effect of syntactic/semantic similarity of target and masking speech in different spatial conditions among younger, middle-aged, and older adults. The results of this experiment indicate that differences in speech recognition between older and younger participants were largest when the masker surrounded the target and was more similar to the target, especially at more adverse signal-to-noise ratios. Differences among listeners and the effect of similarity were much less robust, and all listeners were relatively resistant to masking, when maskers were located on one side of the target message. The present results suggest that previous studies using highly aligned stimuli may have overestimated age-related speech recognition problems.
  • 《Webb space telescope secondary mirror installed》

    • 来源专题:中国科学院西安光机所服务
    • 编译者:lib_yaya
    • 发布时间:2016-03-17
    • The sole secondary mirror that will fly aboard NASA's James Webb Space Telescope was installed onto the telescope at NASA's Goddard Space Flight Center in Greenbelt, Maryland, on March 3, 2016. The Webb telescope uses many mirrors to direct incoming light into the telescope's instruments. The secondary mirror is called the secondary mirror because it is the second surface the light from the cosmos hits on its route into the telescope. Before its launch, engineers must build and test the tele...