105 citations · 156 across the 6 of their papers we have counts for
6 papers
Algorithm and performance of a clinical IMRT beam-angle optimization system
David Djajaputra, Qiuwen Wu, Yan Wu +1
This paper describes the algorithm and examines the performance of an IMRT beam-angle optimization (BAO) system. In this algorithm successive sets of beam angles are selected from…
Systematic first-principles study of impurity hybridization in NiAl
David Djajaputra, Bernard R. Cooper
We have performed a systematic first-principles computational study of the effects of impurity atoms (boron, carbon, nitrogen, oxygen, silicon, phosporus, and sulfur) on the orbita…
Tight-binding parameters from the full-potential linear muffin-tin orbital method: A feasibility study on NiAl
David Djajaputra, Bernard R. Cooper
We have examined a method of direct extraction of accurate tight-binding parameters from an ab-initio band-structure calculation. The linear muffin-tin potential method, in its ful…
Oxygen impurities in NiAl: Relaxation effects
David Djajaputra, Bernard R. Cooper
We have used a full-potential linear muffin-tin orbital method to calculate the effects of oxygen impurities on the electronic structure of NiAl. Using the supercell method with a…
Hydrogen atom in a spherical well: linear approximation
David Djajaputra, Bernard R. Cooper
We discuss the boundary effects on a quantum system by examining the problem of a hydrogen atom in a spherical well. By using an approximation method which is linear in energy we c…
Susceptibility and vertex corrections for a square Fermi surface
D. Djajaputra, J. Ruvalds
We investigate the response of an electron system which exhibits ideal nesting features. Using the standard Matsubara formalism we derive analytic expressions for the imaginary and…