Adam Denchfield

Illinois Institute of Technology | IIT · Department of Physics

Nonlinear conjugate gradient (NCG) methods can generate search directions using only first-order information and a few dot products, making them attractive algorithms for solving large-scale optimization problems. However, even the most modern NCG methods can require large numbers of iterations and, therefore, many function evaluations to converge...

The quantum efficiencies (QE) of photocathodes consisting of bulk Nb substrates coated with thin films of Cs2Te are reported. Using the standard recipe for Cs2Te deposition developed for Mo substrates (220 {\AA} Te thickness), a QE ~11% - 13% at light wavelength of 248 nm is achieved for the Nb substrates, consistent with that found on Mo. Systemat...

A poster describing the modeling of a semiconducting photocathode material on top of both Nb and Mo substrates to explain experimental data.

High quality thin films of MoN have been grown using atomic layer deposition (ALD), for their potential use in superconducting radio frequency (RF) cavities. Raman spectroscopy has been used to provide a quantitative measure of MoN film quality on a variety of substrates. However, to date, no theoretical determination of the Raman active modes of M...

It has been shown that chemicals and hormones play a role in the linear growth of growth plate chondrocytes (van der Eerden et al., 2003), but studies of linear regulated growth of chondrocytes in vitro have not been found. There have been studies with chondrocytes embedded in alginate hydrogel beads (De Ceuninck et al., 2004) as well as porcine em...

Hot spots in superconducting radio-frequency (SRF) cavities at the Advanced Photon Source are a problem found to be at least partially caused by surface carbon and oxygen based molecules. This study illustrates how Density Functional Theory (DFT) can be used to compare theoretical spectra of various molecules to the experimental results, which can...