Using single-mode infrared fibers for interferometry: progress report.

Using Spitzer to Estimate the Kepler False Positive Rate and to Validate Kepler Candidates.

Using stars for remote sensing of the Earth's stratosphere

Using the CeSiC material for the WSO-UV spectrographs

Using the Hands-On Optics Terrific Telescopes Kit in The International Year of Astronomy

Using the Hands-On Optics ``Terrific Telescopes'' Kit in the International Year of Astronomy

Using the Optical Code for Phase Analysis of the Fiber-Optic ESPI Set-Up

Using Time of Flight Mass Spectrometry to Determine Temperature

Using two MEMS deformable mirrors in an adaptive optics test bed for multiconjugate correction

Using wavefront sensor information in image post-processing to improve the resolution of telescopes with small aberrations

USSR report: Space

UT 15-color dichroic-mirror camera and future prospects

Utilisation des proprietes photochromes du dithizonate de mercure en hydrodynamique

Utilization of the~Ensemble~Kalman~Filter: an optimal control law for the adaptive optics of the E-ELT

Utilizing Nst Data To Look For Connection Between Photospheric Dynamics And Small-scale Chromospheric Activity

UV and optical light transmission properties in deep ice at the South Pole

UV camera for observations of the earth's upper atmosphere and low-orbit space objects from the MIR manned orbital station

UV Imaging of R136 with the GHRS and the WFPC-2

UV light propagation under low-visibility conditions and its application to aircraft landing aid

UV photometry of Venus - Scattering layer over absorbing clouds