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This paper describes a new technique for passive ranging which is of special interest in areas such as covert nap-of-the-earth helicopter flight and spacecraft landing. This technique is based on the expansion experienced by the image-plane projection of an object as its distance from the sensor decreases. The motion and shape of a small window, assumed to fall inside the boundaries of some obj...

The Apache Point Observatory Lunar Laser-ranging Operation (APOLLO) is a nextgeneration lunar laser ranging (LLR) campaign aimed at order-of-magnitude improvements in tests of gravitational physics via millimeter range precision. We will employ the 3.5 m telescope at the Apache Point Observatory (APO), located in southern New Mexico at an altitude of 2800 m. As a result of the large aperture si...

surface is crisscrossed with picket fences made of immobile transmembrane proteins. Until now, single-particle tracking (SPT) has been too slow to provide a high-resolution view of lipid diffusion. In an impressive technical achievement, the authors developed a SPT technique with 25s resolution, and then used it to follow the diffusion of a nonraft lipid in a cell membrane. The lipid molecule w...

The inadequate ventilation and complex environments in underground coal mines lead to a high concentration of dust particles. As result, the health miners accuracy laser rangefinder measurements are endangered. It is crucial enhance rangefinder’s efficiency mitigate risks reduce labor intensity. In this study, we propose power attenuation model ranging correction address issues inaccurate envir...