We study the notion ofmulti-collision resistance of hash functions— a natural relaxation of collisionresistance that only guarantees the intractability of finding many (rather than two) inputs that map to the same image. An appealing feature of such hash functions is that unlike their collision-resistant counterparts, they do not necessarily require a key. Specifically, in the keyless setting, ...

We presentFUSE andHST STIS observations of the absorption-line system near the emission redshift of the radioquiet, X-ray-bright quasar HE 0226 4110 (z 1⁄4 0:495, V 1⁄4 15:2). The spectra cover the rest-frame wavelength range 610–11508, and we detect a wide range of ionization species, including four adjacent stages of oxygen: O iii–vi, which reveal a striking change in gas kinematics with ioni...

A short discussion of some conventional diagnostic techniques, followed by a discussion of the Raman effect and the laser Doppler anemometer, is given. The apparatus used at PINY and the techniques developed utilizing the Raman effect are described. Some experimental results concerning concentrations of mixtures and temperature measurements in flames are presented and discussed. ** This researc...

Abstract Introduction Adolescents routinely experience insufficient sleep. Compared to adults, less is known regarding how wake extension and recovery sleep impact objective subjective indexes of vigilance in youth. Here we explore these questions using acute extension. Methods Twenty-two 10–13-year-old children (12.03±1.14 years, 12F) completed a week actigraphy-monitored at-home stabilization...