Optical communications downlink from a low-earth orbiting 1.5U CubeSat.

In this article, we present the first demonstration of an optical communications downlink from a low-earth orbiting free-flying CubeSat. Two 1.5U vehicles, AC7-B&C, built under NASA's Optical Communications and Sensors Demonstration (OCSD) program were launched in November 2017 and subsequently placed into a 450-km, 51.

Depression, post-traumatic stress disorder, and dry eye syndrome: a study utilizing the national United States Veterans Affairs administrative database.

Purpose: To study the scope of dry eye syndrome (DES) in veterans on a national level and to evaluate the relationship between psychiatric diagnoses and DES.

Design: Case-control study.

Setting: Patients were seen in a Veterans Affairs (VA) eye clinic between 2006 and 2011.