521 Works

Numerical investigation of particle size segregation in saturated granular flows using CFD-DEM coupling approach

Kahlil F. E. Cui & Gordon G. D. Zhou
Particle size segregation is a common feature in debris-flow deposits and is assumed to develop in a similar way as in dry granular flows where fluid forces are neglected. Solid-fluid coupling however is a defining feature of debris flows and fluid forces must therefore be accounted for in modelling for the segregation that develops therein. This paper presents a numerical investigation of the mechanisms of segregation under the influence of fluid forces. For this, a...

Identification of the carbon incorporation mechanism during atomic layer deposition of SiCxNy using in situ ATR-FTIR spectroscopy

Rafaiel A. Ovanesyan, Noemi Leick, Kathryn M. Kelchner, Dennis M. Hausmann & Sumit Agarwal

Electronic tuning of 4,10-dibromoanthanthrone for n-type acceptor materials

Robert Johnson & Alan Sellinger

Using circuit-level power measurements in household energy management systems

Alan Marchiori & Qi Han
The first requirement for any intelligent household energy management system is to be able to accurately measure energy usage in the home. Measuring energy usage is not difficult; however we must decide what to measure. Whole-home energy measurement is cheap and easy to setup because only one sensor is placed where the home connects to the power grid. The collected data can provide useful information for large appliances. However, the only way to monitor the...

Microstructure-mechanical property relationships for Ni-Ti-Pt high temperature shape memory alloys

Grant Hudish, Michael J. Kaufman, David R. Diercks, A. Garg & R. D. Noebe
Within the past decade, NASA has been developing high temperature shape memory alloys (HTSMAs) for use as simple, robust, and lightweight solid-state actuators. Shape memory alloys (SMAs) as actuators are considered nonconventional and advanced actuation devices and are capable of providing a power to weight ratio greater than that of DC motors, pneumatic systems, and comparable to that of hydraulic systems, in a much more compact and simplified geometry. Alloys of Ni and Ti in...

Analysis of well and fault modeling in comparison to seismic data for characterization of an enhanced geothermal system

Hayden A. Powers, Whitney Trainor-Guitton, Samir Jreij & Antoine Guitton
Includes bibliographical references.

Significant increases in Fe incorporation induced by diammonium phosphate during high-acidity SBA-15 synthesis

Malcolm R. Davidson
Includes bibliographic references.

Comparison of methods for calculating the rate of appearance of exogenous glucose

Kai J. Bartlette, Bryan C. Bergman, Kristen J. Nadeau, Melanie Cree-Green & Cecilia Diniz Behn

Characterization of molecular magnets using EPR

Kory Riskey, Joel Miller, Brian Simonds & P. Craig Taylor
Molecules involving tetracyanoethylene (TCNE) and transition or rare earth compounds have been found to exhibit magnetic properties at low temperature. One compound, however, with V and TCNE has been found to have an ordering temperature above 300 K. A compound with Fe and TCNE has shown to exhibit 32% more magnetization in molecules than iron metal. Molecular magnet compounds can be dissolved in a solvent, added to a matrix such as a polymer, and do...

Synthesis of [Si1-xGex]136 type II clathrates (0.1

Taufik Raharjo, Eric Toberer, Carolyn A. Koh & Lakshmi Krishna
The unique thermal, electrical, optical, and structural properties of Group IV clathrates have brought them to the forefront of potential renewable energy opportunities. Specifically, the semiconductor capabilities of crystalline alloyed silicon-germanium clathrate are especially promising due to the tenability of these properties for photovoltaics or thermoelectrics. However, a successful crystalline clathrate has yet to be formed at all molar compositions of SiGe. Therefore, understanding the critical parameters which control the formation of a crystalline alloyed...

Incorporation of silicon nanoparticles into silicon based solar cells

Jann Grovogui, Chito Kendrick & Reuben T. Collins
In this project, silicon based solar cells were developed using active layers that consisted of Amorphous Silicon as well as Silicon Nanoparticles (Silicon Quantum Dots). The ultimate goal of this project was to fabricate a working solar cell with an active layer that incorporated Silicon Nanoparticles in an attempt to improve cell functionality.

Hydrogen peroxide dynamics in an agricultural headwater stream: evidence for significant biological production

Taylor C. Dixon & Bettina M. Voelker
Hydrogen peroxide (H2O2) is known to play key roles in aquatic systems, including metal redox cycling and degradation of organic matter into bioavailable forms. Detailed knowledge of the cycling of H2O2 in natural waters thus fosters the understanding of important aquatic biogeochemical processes. Although biological production of H2O2 has been observed in culture studies, the significance of this process to the H2O2 budget in freshwater systems remains unknown. In this study, isotopically-labeled H2O2 (H218O2) was...

Statistical shape model for probabilistic studies of the lumbar spine, A

Kelli S. Huls & Anthony J. Petrella
Introduction: Computational modeling of the spine has become a promising option for evaluating the performance of new spinal implants and procedures before they are used in patients. Most models in the literature only represent a single subject and neglect normal variation that exists between specimens. However, using a probabilistic simulation (select input variables from a normal distribution and determine how they affect outputs) of virtual patients, whose geometries are representative of actual patients, may lead...

Electric-field driven assembly of colloids confined near a surface: a Monte Carlo study

Joseph R. Maestas, Ning Wu & David T. Wu
Includes bibliographical references.

Understanding CH4 leakage from pipelines as affected by soil heterogeneity and moisture

Melissa Mitton & Kathleen Smits

Effect of surface layer on evaporation from porous media

Zhen Li & Kathleen M. Smits
Includes bibliographical references.

Study of silicon clathrates with sodium guest using EPR

Ariel Shlosberg, Stephanie Jump, Lakshmi Krishna & P. Craig Taylor

Optimization of colloid deposition via dielectrophoretic assembly and flow coating

Kelly McKenzie, Jingjing Gong & Ning Wu

From poop to gold: an examination of energy-positive wastewater treatment in an anaerobic reactor system

Daniel Lucio, Andrew Pfluger, Jennie Callahan, Brett Van Houghton, Junko Munakata Marr & Linda A. Figueroa
Today’s current best practices for wastewater treatment involve aerobic processes that require substantial amounts of energy. Best practice aerobic wastewater treatment facilities with anaerobic digestion of biosolids are able to produce 500-700 kWh/MG, which is approximately one-third to one-half of the 1500-2000 kWh/MG used to operate the facility. On the other hand, primary anaerobic treatment has the potential to be energy-positive by using methane gas produced by anaerobic microbial communities in the system. Previous results...

Introduction and workflow of geothermal reservoir imaging using distributed acoustic sensing

Samir F. Jreij & Whitney Trainor-Guitton

Kernel-based Lagrangian method for imperfectly-mixed chemical reactions, A

Michael J. Schmidt
Includes bibliographical references.

Quasiparticle spectrum of 2-D Dirac vortices in optical lattices

Laith H. Haddad & Lincoln D. Carr
Bose-Einstein condensates (BEC's) in a honeycomb optical lattice are described by a nonlinear Dirac equaton (NLDE) in the long wavelength, mean field limit [1]. The bipartite structure of the lattice appears as pseudospin in the multi-component BEC with states above and below the Dirac point playing the roles of particles and antiparticles. Although much work has been done on NLDE's, the bulk of the literature deals with models with Poincare invariant nonlinearites. In contrast our...

Efficient stochastic wake modeling for wind farm control

Tim Taylor & Kathryn E. Johnson
Includes bibliographical references.

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