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Research on a space microsatellite laser communication method based on modulating retroreflector technology
Published in Khaled Habib, Elfed Lewis, Frontier Research and Innovation in Optoelectronics Technology and Industry, 2018
J.Y. Ren, H.Y. Sun, L.X. Zhang
As shown in Figure 2, a cat’s eye optical lens is a system that can return parallel incident light in exactly the same direction as the incident angle. The cat’s eye optical system approaches the diffraction limit within an effective field of view angle. Assume that the angle between the incident beam and the optical axis of the optical system is φ, also called incident angle. The focal length of the optical system is f, the diameter of the modulator is DMOD, the cat’s eye optical system view angle is defined as: () θt=2arctan(DMOD2f)
The Cell as an Inspiration in Biomaterial Design
Published in Heather N. Hayenga, Helim Aranda-Espinoza, Biomaterial Mechanics, 2017
Helim Aranda-Espinoza, Katrina Adlerz
Biology has served as an inspiration in the design of many materials. The inspiration for Velcro, for example, was inspired by plant burrs that clung to the inventor’s pants during a hike. Similarly, reflectors in the road are called cat’s eye because they were modeled after the way that cats’ eyes reflect light.
Pedestrian–vehicular interactions in a mixed street environment
Published in Transportation Letters, 2020
Mazen Danaf, Ahmad Sabri, Maya Abou-Zeid, Isam Kaysi
Pedestrian crossing behavior data was collected on Bliss Street on weekdays from July 2014 to March 2015. Around the middle of the data collection phase (November 2014), a zebra crosswalk was installed facing the Main Gate with clustered cat’s eye studs at 6 m upstream of the crosswalk. The cat’s eye studs are raised pavement markers on roads used as a retroreflective safety device. Three types of data related to pedestrian crossings were recorded: video data of pedestrian crossings, speeds of approaching vehicles, and surveys of crossing pedestrians. Since the survey data turned out not to be correlated with pedestrian crossing behavior, we do not describe it further in this paper. Data collection lasted from 60 to 90 min per session, and was conducted between 16:00 and 19:00 on weekdays. The flow of pedestrians and vehicles was moderate throughout the sessions. The traffic conditions were neither congested nor free-flow conditions. The average approaching vehicle speed was around 17.3 km/h throughout all the sessions.