We report the design, fabrication, and preliminary characterization of a compact Xray generator for improved X-ray absorption imaging that uses a nanostructured field emission cathode (FEC) as the electron source and a microstructured transmission anode as the X-ray generating element. FECs consume less power, respond faster, and tolerate lower vacuum than thermionic cathodes used in convention...

Muons from cosmic-ray interactions in the atmosphere provide a high-statistics source of particles that can be used to study the performance and calibration of the ATLAS detector. Cosmic-ray muons can penetrate to the cavern and deposit energy in all detector subsystems. Such events have played an important role in the commissioning of the detector since the start of the installation phase in 2...

The current gamma-ray/neutron instrumentation development effort at NASA Goddard Space Flight Center aims to extend the use of active pulsed neutron interrogation techniques to probe the subsurface elemental composition of planetary bodies in situ. Previous NASA planetary science missions, that used neutron and/or gamma-ray spectroscopy instruments, have relied on neutrons produced from galacti...

The periodic DNLS gauge is an anticipative map with singular generator which revealed crucial in the study of derivative NLS. We prove quasi-invariance Gaussian measure on L2(T) covariance [1+(−Δ)s]−1 under these transformations for any s>12. This extends previous achievements by Nahmod, Ray-Bellet, Sheffield and Staffilani (2011) Genovese, Lucà Valeri (2018), who proved result integer values r...

Hydrogen incorporation in aluminous orthopyroxene may control the generation of melt and dominate the seismic properties at the base of the Earth’s lithosphere. To clarify the substitution mechanism of H, we have synthesized, characterized, and refi ned the crystal structure of this potentially signifi cant variant of orthopyroxene. The experimentally produced crystals are small needles up to a...

The mechanism of general corrosion Alloy 690 in simulated steam generator crevices is investigated by voltammetry, electrochemical impedance spectroscopy and slow strain rate tests, combined with ex-situ characterization the oxides using X-ray photoelectron Glow-discharge optical emission spectroscopies. Quantitative interpretation spectra Mixed-Conduction Model furnishes estimates kinetic tran...

In this research paper, the performance of an air-cored axial flux permanent magnet synchronous generator is evaluated for low speed, direct drive applications using 3D finite element modeling and experimental tests. The structure of the considered machine consists of double rotor and coreless stator, which results in the absence of core losses, reduction of stator weight and elimination of cog...