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A novel design for a deep-well InP-based QC-laser structure has been realized using MOCVD growth for emission wavelengths of 4.6 mum-4.8 mum with low threshold current density (1.5 KA/cm2) at room temperature (RT) and reduced temperature sensitivity.
Sliding metal-on-metal wear experiments were conducted at the meso-scale within a controlled environment chamber to evaluate the influence of current density, polarity, and humidified gas on system wear behavior. A meso-scale friction tester (MFT) was modified by enclosing the apparatus with an environmental chamber used for introducing humidified gases. Additionally, a high capacity direct current...
On the microscale, armature-rail interface contact is accomplished through surface asperity interaction. In this imperfect contact model (a version of the Bowden-Tabor model), we postulate the coexistence of one or more contact regimes, such as solid-solid contact, liquid-metal lubricated contact, and arcing contact. We are developing microscopic models and experimental apparatus to study this postulate...
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