SEARCH · Search NASA
Results for “rough”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
A distributed element roughness model for generalized surface morphologies
Not Available
Hysteresis effects and roughness suppression efficacy of polyethylenimine additive in Cu electrodeposition in ethaline
Not Available
Surface roughness and finishing techniques in selective laser melted GRCop-84 copper for an additive manufactured lower hybrid current drive launcher
Not Available
Influence of spattering on in-process layer surface roughness during laser powder bed fusion
Not provided.
Numerical analysis of rotating scans’ effect on surface roughness in laser-powder bed fusion
Not Available
Interaction of contour and hatch parameters on vertical surface roughness in laser powder bed fusion
Not Available
Gustiness in thermally-stratified urban turbulent boundary-layer flows and the influence of surface roughness
Not Available
Rough-surface effect on sputtering of Cr bombarded by low-energy He plasma
Not Available
Bayesian linear regression for surface roughness prediction
Not Available
Diamonds in the Rough: Direct Surface Enhanced Infrared Spectroscopic Evidence of Nitrogen Reduction on Boron-Doped Diamond Supported Metal Catalysts
In situ investigations of electrocatalytic processes of increasing societal interest such as the nitrogen reduction reaction (NRR) re-quire aggressive experimental conditions that are not readily compatible with surface sensitive techniques such as attenuated total reflection surface enhanced infrared absorption spectroscopy (ATR-SEIRAS). A method for performing ATR-SEIRAS studies at very negative potentials where conventional IR-active films delaminate, and fail is reported. The method relies on a thin film of very robust boron-doped diamond deposited on a micromachined Si wafer, which provides extended mid-IR transparency at long wavelengths. SEIRAS activity is achieved by electrodepositing gold nanoparticles onto the conductive BDD layer. The Au@BDD layers are shown to sustain prolonged periods of electrolysis at negative potentials with no degradation of the modifying layer. The efficacy of these substrates for electrocatalysis is demonstrated by studying the reduction of N 2 at -1.5 V vs Ag/AgCl in an aqueous-based electrolyte. So under these conditions, direct spectroscopic evidence of both NH 3 and hydrazine formed from the nitrogen reduction reaction (NRR) is provided.