Henry Kelly

Learn More
Gamma-ray bursts (GRBs) are highly energetic explosions signaling the death of massive stars in distant galaxies. The Gamma-ray Burst Monitor and Large Area Telescope onboard the Fermi Observatory together record GRBs over a broad energy range spanning about 7 decades of gammaray energy. In September 2008, Fermi observed the exceptionally luminous GRB(More)
Founded in 1945, the Federation of American Scientists is dedicated to ending the worldwide arms race and reducing the dangers of nuclear weapons. Over the years it has played a key role in ensuring that the public debate over arms control, and other science and technology policy issues, is informed by clear, reliable, and unbiased information and analysis(More)
1 The challenge The nation's system of highway transportation – Surface Transportation 2.0 – has provided the flexibility, speed, reliability, and efficiency needed to support a US economy constantly changing and constantly on the move. But innovations are badly needed if the system is to continue to provide such services in the future. Consider:  Energy(More)
This work describes the application of Langmuir probe diagnostics to the measurement of the electron temperature in a time-fluctuating-highly ionized, non-equilibrium cutting arc. The electron retarding part of the time-averaged current-voltage characteristic of the probe was analysed, assuming that the standard exponential expression describing the(More)