Unreasonable postulate in the perturbative approach to quantum gravity
Unregelmässigkeit und Regelmässigkeit der Sporadischen E-Schicht
Unresolved Characteristics of Europa's Crater Population
Unresolved Galaxy Classifier for ESA's Gaia Mission
Unsatisfiable (k,(4*2^k/k))-CNF formulas
Unsatisfiable CNF Formulas need many Conflicts
Unsatisfiable Linear CNF Formulas Are Large and Complex
Unsatisfiable Linear k-CNFs Exist, for every k
Unsaturated Throughput Analysis of IEEE 802.11 in Presence of Non Ideal Transmission Channel and Capture Effects
Unscented Kalman filter and its application In GPS-based satellite orbit determination
Unscrambling the Near-Infrared Properties of Young Planetary Nebulae
Unsolved problems in observational astronomy. II. Focus on rapid response - mining the sky with ``thinking" telescopes
Unsolved Problems in the Evolution of Interacting Binary Stars
Unsolved Problems in Visibility Graphs of Points, Segments and Polygons
Unstable 06.5f?p star HD 148937 and its interstellar environment
Unstable accretion disks in FU Orionis stars
Unstable GRB Photospheres and Blueshifted e+/- Annihilation Lines
Unstable resonator for lasers operating on weakly amplifying media
Unstable Spiral Modes in Disk-Shaped Galaxies: Enhancement of Growth Rate
Unsteady convection and precipitation of energetic particles