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Articles 1 - 3 of 3
Full-Text Articles in Engineering
Photon Attenuation Layer Silicon-Based X-Ray Detector: Quantum Efficiency Investigation And Algorithmic Processing Of Individual Detection Events, Kevin Larkin
ENGS 88 Honors Thesis (AB Students)
State-of-the-art X-ray detectors either use silicon direct detection—which is inefficient, as silicon is mostly transparent to high-energy X-rays—or rely on expensive scintillators to first down-convert X-ray photons to lower energies. Dr. Eldred Lee of Dartmouth College recently completed doctoral research that suggested the promise of a novel alternative: silicon-based X-ray detectors that utilize photon attenuation layers rather than scintillators. While Dr. Lee’s work is certainly rigorous and meritorious, background noise controls were rendered less effective by circumstances. The work presented in this thesis succeeded in implementing much better background noise controls for a series of new tests to compare the …
A Foray Into Laboratory Scale Soil Incubations With Corn Stover And High Lignin Fermentation Byproduct, Michelle Wang
A Foray Into Laboratory Scale Soil Incubations With Corn Stover And High Lignin Fermentation Byproduct, Michelle Wang
ENGS 88 Honors Thesis (AB Students)
As the production of biofuels increases to meet the demands of a growing low carbon economy, questions of sustainability surrounding its feedstock and waste streams have become increasingly relevant. In the biofuel production process, crop residues like corn stover are harvested from the field and converted to biofuels leaving generating a residue called high lignin fermentation byproduct (HLFB). From extensive process modelling in the literature, it is suggested that HLFB should be either combusted to fuel auxiliary conversion processes or returned to the soil in place of the crop residues that were harvested. Currently, there is little literature testing the …
Surface Engineering Of Annealed High Entropy Alloys Towards Thermodynamically Stable, Anti-Oxidation, Solar Selective Absorbers, Sheppard R. Somers
Surface Engineering Of Annealed High Entropy Alloys Towards Thermodynamically Stable, Anti-Oxidation, Solar Selective Absorbers, Sheppard R. Somers
ENGS 88 Honors Thesis (AB Students)
Concentrating solar power (CSP) systems require receivers that maintain their physical properties at the high operating temperature and are absorbent. The high entropy alloy Fe28.2Ni18.8Mn32.9Al14.1Cr6 (HEA) investigated in this thesis fills these needs by harnessing the HEA’s oxidation process to create a selective solar absorbing layer that grows at a parabolic rate at CSP operating temperatures. Results of this research demonstrate that annealing processes of HEA can yield over 90% solar thermal efficiency by engineering the surface oxidation to be both physically and optically optimized for absorption.