Several lines of evidence suggest that the galaxy cluster Cl0024+17, an apparently relaxed system, is actually a collision of two clusters, the interaction occurring along our line of sight. Recent lensing observations suggest the presence of a ring-like dark matter structure, which has been interpreted as the result of such a collision. In this paper we present N -body simulations of cluster c...

We design, implement, and evaluate CovertCast, a censorship circumvention system that broadcasts the content of popular websites in real-time, encrypted video streams on common live-streaming services such as YouTube. CovertCast does not require any modifications to the streaming service and employs the same protocols, servers, and streaming software as any other user of the service. Therefore,...

Affiliation: 1. Infectious Disease Division, Winthrop-University Hospital, Mineola, New York; and State University of New York, School of Medicine, Stony Brook, New York. Address correspondence to Burke A. Cunha, MD, Chief, Infectious Disease Division, Winthrop-University Hospital, 222 Station Plaza North, Suite 432, Mineola, NY 11501 or Professor of Medicine, State University of New York, Scho...

A Keck II low resolution spectrum shortward of one micron is presented for SDSS 1624+0029, the first field methane or T dwarf discovered in the Sloan Digital Sky Survey. Significant flux is detected down to the spectrum’s short wavelength limit of 6200Å. The spectrum exhibits a broad absorption feature centered at 7700Å, which we interpret as the K I 7665/7699 resonance doublet. The observed fl...

Alejandro Cabo, Francisco Claro, Eduardo Menéndez-Proupin,* Norge Cruz-Hernández, and Javier Fernández-Sanz Grupo de Física Teórica, Instituto de Cibernética, Matematica y Física, Calle E, No. 309, Vedado, La Habana, Cuba Facultad de Física, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860 Santiago, Chile Departamento de Física, Facultad de Ciencias, Universidad de Chile, Las Palm...