Two-point resolution criterion for multiaperture optical telescopes
Two-pulse interference and superluminality
Two-scale solution for atmospheric scintillation
Two-sided pyramid wavefront sensor in the direct phase mode
Two-stage optics - High-acuity performance from low-acuity optical systems
Two-telescope interferometric testbed to develop low-cost atmospheric correction techniques for high angular resolution
Two-temperature relaxation and melting after absorption of femtosecond laser pulse
Two-way multi-band optical/IR transmission measurements in the Persian Gulf coastal region
Two-year Monitoring of MWC349 in Optical and Radio Domains
Type conductivity conversion in MOCVD CdxHg1-xTe/GaAs hetero-structures under ion milling
U.S. Air Force Academy 4-m telescope
U.S. Naval Observatory's Programs to Determine Accurate Proper Motions of Faint Stars
Ubiquity of optical activity in planar metamaterial scatterers
UBV and UVBY photometry of the magnetic CP star 56 ARIETIS - 1990 and 1991
UBV photometry of SGP AGNs (La Franca+, 1999)
UBV photometry of SN 1987A - Earliest photoelectric observations
UBV photometry of stars whose positions are accurately known.
UBV photometry of Vesta
UBVRI photometry of SN 1993J in M81: The first 120 days
UCLA 3-color infrared speckle photometer