Publications

Journal Publications

Note: student authors are identified by italic type.

T.D. Musho and D.G. Walker, ``Scalability of Quantum Simulations of Thermoelectric Superlattice Devices,'' Computational Materials Science, Vol. 50, pp. 3265--3269, 2011. [preprint] [online]
T.D. Musho and D.G. Walker, ``Thermoelectric Properties of Superlattice Materials with Variably-Spaced Layers,'' Journal of Materials Research, Vol. 26, No. 15, pp. 1993--2000, August 2011. [preprint] [Cambridge Press link]
N.A. Roberts and D.G. Walker, ``Computational Study of Thermal Rectification from Nanostructured Interfaces,'' Journal of Heat Transfer, Vol. 133, No. 9, 092401, September, 2011. [preprint] [online]
N.A. Roberts and D.G. Walker, ``A Review of Thermal Rectification Observations and Mechanisms in Solid Materials,'' International Journal of Thermal Sciences, Vol. 50, No. 5, pp. 648--662. May, 2011. [preprint] [online]
N.A. Roberts and D.G. Walker, ``Investigation of Computational and Visual Modules to Enhance Learning in Undergraduate Heat Transfer,'' Computers in Education Journal, Vol. 2, No. 1, pp. 104--112, January-March, 2011.
N.A. Roberts and D.G. Walker, ``Phonon wave-packet simulations of Ar/Kr interfaces for thermal rectification,'' Journal of Applied Physics, 2010, Vol. 108, No. 12, 123515, December 2010. [preprint]
P. Grant, D.G. Walker, ``Parallelized direct search of a binary objective,'' Journal of Computing and Information Science in Engineering, Vol. 10, No. 4, 044502, December, 2010. [preprint] [online]
N.A. Roberts and D.G. Walker, ``Convective Performance Of Nanofluids In Commercial Electronics Cooling Systems,'' Applied Thermal Engineering, Vol. 30, No. 16, p. 2499--2504, November 2010. [online]
R.A. Hansel, J. Rosen and D.G. Walker, ``Transport Involving Conducting Fibers In A Non-Conducting Matrix,'' International Journal of Thermal Sciences, Vol. 49, No. 9, p. 1561--1566, September, 2010. [preprint ]

R.A. Hansel, S.K. Desai, S.W. Allison, A.L. Heyes, D.G. Walker, ``Emission Lifetimes of Europium-Doped Pyrochlores for Phosphor Thermometry,'' Journal of Applied Physics, Vol. 107, No. 1, p. 6101, January, 2010. [online]
R.A. Hansel, S.W. Allison, D.G. Walker, ``Temperature-dependent luminescence of gallium-substituted YAG:Ce,'' Journal of Materials Science, Vol. 45, No. 1, p. 146, 2009. [online]
R.A. Hansel, S.W. Allison, D.G. Walker, ``Temperature-dependent luminescence of Ce³⁺ in gallium-substituted garnets,'' Applied Physics Letters, Vol. 95, p. 114102, 2009. [article]
S.W. Allison, J.R. Buczyna, R.A. Hansel, D.G. Walker and G.T. Gillies, ``Temperature-dependent fluorescence decay lifetimes of the phosphor Y₃(Al_0.5Ga_0.5)₅O₁₂:Ce 1%,'' Journal of Applied Physics, Vol. 105, No. 3, p. 6105, February 2009. [preprint]
N.A. Roberts, D. Li, D.G. Walker, ``Molecular dynamics simulation of thermal conductivity of nanocrystalline composite films,'' International Journal of Heat and Mass Transfer, Vol. 52, No. 7-8, pp. 2002-2008, March 2009. [article]
A. Bulusu and D.G. Walker, ``Review of transport modeling for thermoelectric materials,'' Superlattices and Microstructures, Vol. 44, pp. 1--36, April, 2008.[article]
A. Bulusu and D.G. Walker, ``One-dimensional thin-film phonon transport with generation,'' Microelectronics Journal, Vol. 39, No. 7, pp. 950--956, July 2008. [article]
D.G. Walker, M.A. Stremler, J. Johnson, D. Bruff and S.P. Brophy, ``Case study on the pedagogical impact of tablet PCs as a presentation medium in engineering classrooms,'' International Journal of Engineering Education, Vol 24, No. 3. pp. 606--615, July, 2008. [proof]
A. Bulusu and D.G. Walker, `` Quantum Modeling of Thermoelectric Properties of Si/Ge/Si Superlattices,'' IEEE Transactions on Electron Devices, Vol. 55, No. 1, pp. 423--429, January, 2008. [article]
A. Bulusu and D.G. Walker, ``Quantum modeling of thermoelectric performance of strained Si/Ge/Si superlattices using the nonequilibrium Green's function method,'' Journal of Applied Physics, Vol. 102, No. 7, October 2007, 073713. [article]
A. Bulusu and D.G. Walker, ``Modeling of thermoelectric properties of semiconductor thin films with quantum and scattering effects,'' Journal of Heat Transfer, Vol. 129, No. 4, April, 2007, pp. 492--499. [article]
D.G. Walker and S.W. Allison, ``Transient measurements using thermographic phosphors,'' ISA Transactions, Vol. 46, January, 2007, pp. 15--20. [article]
R.D. Harvey, D.G. Walker and K.D. Frampton, ``Enhancing performance of thermoelectric coolers through the application of distributed control,'' IEEE Transactions on Components and Packaging Technologies, Vol. 30, No. 2, June 2007, pp. 330--336. [article]
A.M. Albadri, R.D. Schrimpf, D.G. Walker, S.V. Mahajan, ``Coupled electrothermal simulations of single-event burnout in power diodes,'' IEEE Transaction on Nuclear Science, Vol. 52, No. 6, Part. 1, 2005, pp. 2194--2199. [article]
A.M. Albadri, R.D. Schrimpf, K.D. Galloway, D.G. Walker, ``Single-event burnout in power diodes: mechanisms and models,'' Microelectronics Reliability, Vol. 46, No. 2--4, February--April, 2006, pp. 317--325. [article]
D.G. Walker, ``Heat flux determination from measured heating rates using thermographic phosphors,'' Journal of Heat Transfer, Vol. 127, No. 6, June 2005, pp. 560--570. [article]
D.G. Walker, C.T. Harris, T.S. Fisher and J.L. Davidson, ``Estimation of Parameters in Thermal-Field Emission from Diamond,'' Diamond and Related Materials, Vol. 14, No. 1, January 2005, pp. 113--120. [article]
D.G. Walker and R.A. Weller, ``Phonon Production and Nonequilibrium Transport from Ion Strikes,'' IEEE Transactions on Nuclear Science, Vol. 51, No. 6, December 2004, pp. 3318--3323. [article]
D.G. Walker and T.S. Fisher, ``Simulation of field-emitted electron trajectories and transport from carbon nanotubes,'' Journal of Vacuum Science and Technology B, Vol. 22, No. 3, May 2004, pp. 1101--1107. [article] [online](Also published in Virtual Journal of Nanoscale Science and Technology Vol. 9, No. 21, May, 31, 2004.)
C.T. Harris, D.G. Walker, T.S. Fisher and W.H. Hofmeister, ``Experimental Characterization of Anode Heating due to Electron Field Emission,'' Microscale Thermophysical Engineering, Vol. 8, No. 2, June 2004, pp. 101--110. [article]
T.S. Fisher, D.G. Walker and R.A. Weller, ``Analysis and Simulation of Anode Heating from Electron Field Emission,'' IEEE Transactions on Components and Packaging Technologies. Vol. 26, No. 2, June 2003, pp. 317--323. [article]
A. Raman, D.G. Walker and T.S. Fisher, ``Non-Equilibrium Thermal Effects in SOI Power Transistors,'' Solid-State Electronics. Vol. 47, No. 8, August 2003, pp. 1265--1273. [article]
S.H. Shin, T.S. Fisher, D.G. Walker, A.M. Strauss, W.P. Kang and J.L. Davidson, ``High-Temperature Electron Emission from Diamond Films,'' Journal of Vacuum Science and Technology - B, Vol. 21, No. 1, Jan.-Feb. 2003, pp. 587-592. [article]
T.S. Fisher and D.G. Walker, ``Thermal and Electrical Energy Transport and Conversion in Nanoscale Electron Field Emission Processes,'' Journal of Heat Transfer, Vol. 124, No. 5, Oct. 2002, pp. 954-962. [article]
D.G. Walker, T.S. Fisher, J. Liu and R.D. Schrimpf, ``Thermal Modeling of Single Event Burnout Failure in Semiconductor Power Devices,'' Journal of Microelectronics Reliability, Vol. 41, No. 4, pp. 571-578, 2001. [article]
D.G. Walker, E.P. Scott and R.J. Nowak, ``Estimation Methods for 2-D Conduction Effects of Shock-Shock Heat Fluxes from Temperature Measurements,'' AIAA Journal of Thermophysics and Heat Transfer, Vol. 14, No. 4, Oct.-Dec., 2000, pp. 533-539. [article]
D.G. Walker and E.P. Scott, ``Evaluation of Estimation Methods for High Unsteady Heat Fluxes from Surface Measurements,'' AIAA Journal of Thermophysics and Heat Transfer, Vol. 12, No. 4, Oct.-Dec., pp. 543-551, 1998. [article]
D.W. Mackowski, V.R. Rao, D.G. Walker and R.W. Knight, ``Numerical Investigation of the Effects of Thermal Creep in Physical Vapor Transport,'' Journal Crystal Growth, Vol. 179, No. 1--2, pp. 297-308, 1997. [article]

Book Chapters

D.G. Walker, ``Methods for simulating migration of polymer chains,'' in Encyclopedia of Microfluidics and Nanofluidics, Ed. Dongqing Li, 2008. [uncorrected proof]

Refereed Conference Publications

S.L. Gollub, S. Weeden-Wright and D.G. Walker, ``Radiation-Induced Damage of Yttrium Aluminum Garnet and Lanthanum Zirconate,'' AVS Annual Meeting, Nashville, TN, November, 2011. [slides]
N.A. Roberts and D.G. Walker, ``Phonon transport in asymmetric sawtooth nanowires,'' 8th ASME-JSME Thermal Engineering Conference (AJTEC), No. 44341, Honolulu, Hawaii, March 2011. [preprint] [slides]
Majid al-Dosari and D. G. Walker, ``Thermal properties of yttrium aluminum garnet from molecular dynamics simulations,'' 8th ASME-JSME Thermal Engineering Conference (AJTEC), No. 44343, Honolulu, Hawaii, March 2011. [preprint] [slides]
M.R. Myers, A.B Jorge, D.G. Walker, M.J. Mutton, ``Heat source localization sensitivity analysis for an ultrasonic sensor array,'' 8th ASME-JSME Thermal Engineering Conference (AJTEC), No. 44120, Honolulu, Hawaii, March 2011. [preprint] [slides]
T.D. Musho, S.A. Claiborne, D.G. Walker, ``NEGF Quantum Simulation of Field Emission Devices,'' 8th ASME-JSME Thermal Engineering Conference (AJTEC), No. 44504, Honolulu, Hawaii, March 2011. [article] [slides]
A. Jorge, M.R. Myers, D.G. Walker, ``A comparison of extended Kalman filter approaches using non-linear temperature and ultrasound time-of-flight measurement models for heating source localization of a transient heat transfer problem,'' proceedings of the Inverse Problems Design and Optimization, IPDO-027, Joao Possoa, Brazil, August 2010. [article] [slides]
M.R. Myers, A. Jorge, D.G. Walker, M. J. Mutton, ``A comparison of extended Kalman filter, extended information filter and least squares approaches for parameter identification of a transient heat transfer problem,'' proceedings of the Inverse Problems Symposium (IPS), Michigan State University, East Lansing, MI, June 2010. [article] [slides]
N.A. Roberts, D.G. Walker, ``Phonon wave-packet simulations of Ar/Kr interfaces,'' ITherm, Las Vegas, NV, June 2010. [preprint]
Saunak K. Desai, Rachael A. Hansel, Robert W. Pitz and D. G. Walker, ``Europium-doped Pyrochlores for Use as Thermographic Phosphors in Thermal Barrier Coatings,'' AIAA Annual Meeting, Orlando, Florida, January, 2010. [preprint] [slides]
T.D. Musho and D.G. Walker, ``Quantum simulation of nanocrystalline composite thermoelectric properties,'' InterPACK, San Francisco, California, July 2009. [article] [slides] [poster]
N.A. Roberts and D.G. Walker, ``Convection heat transfer of Nanofluids in commercial electronic systems,'' InterPACK, San Francisco, California, July 2009. [article] [slides] [poster]
M.R. Myers, D.G. Walker, D.E. Yuhas and M.J. Mutton, "Heat flux determination from ultrasonic pulse measurements," IMECE, Boston, Massachusetts, November 2008. [article] [slides]
R.A. Hansel, J. Rozen and D.G. Walker, ``Transport involving conducting fibers in a non-conducting matrix,'' 19^th International Symposium on Transport Phenomena, Reykyavik, Iceland, August, 2008. [article] [poster]
N.A. Roberts and D.G. Walker, ``Molecular dynamics simulation of thin films with rough and asymmetric interfaces,'' 19^th International Symposium on Transport Phenomena, Reykyavik, Iceland, August, 2008. [article] [slides]
V. Ramachandran, M. L. Alles, R. A. Reed, J. D. Black, J. A. Pellish, D. G. Walker, ``In-situ Cryogenic SEE Testing of High-Speed SiGe BiCMOS Devices,'' proceedings of the 6th International Planetary Probe Workshop, Atlanta, Georgia, June 2008.
R.A. Hansel, D.G. Walker and S.W. Allison, ``Phosphor thermometry with Gallium-substituted YAG:Ce,'' ISA Conference, Pensacola, Florida, May 2008. [slides]
N.A. Roberts and D.G. Walker, ``Monte Carlo study of thermal transport of direction and frequency dependent boundaries in high Kn systems,'' ITherm, Orlando, Florida, May, 2008. [article] [slides]
R.A. Hansel, S.W. Allison and D.G. Walker, ``Temperature Dependent Fluorescence Ce-doped Garnets for Use as Thermographic Phosphors,'' MRS Annual Conference, San Francisco, CA, March 2008, (1076-K06-06). [article] [poster]
A. Bulusu, D.G. Walker, "State of the art technologies used to improve performance of thermoelectric devices," Joint ASME-ISHMT Heat Transfer Conference, Hyderabad, India, January, 2008. [article] [poster]
D.G. Walker, S.W. Allison, ``Analysis of Transient Heating of Phosphor Coatings,'' 53rd International Instrumentation Symposium, Houston, TX, October, 2007. [article*] [slides]
P. Schmidt, D.G. Walker, D. Yuhas, M. Mutton, ``Thermal measurement of harsh environments using indirect acoustic pyrometry,'' IMECE, Seattle, WA, November, 2007. [article] [slides]
N.A. Roberts, D.G. Walker and D. Li, ``Molecular dynamics simulation of thermal conductivity of nanocrystalline composite films,'' Summer Heat transfer Conference, Vancouver, WA, July, 2007. [article] [slides]
A. Bulusu and D.G. Walker, ``One-dimensional thin-film phonon transport with generation,'' Thermes, Santa Fe, NM, January, 2007. [article]
A. Bulusu and D.G. Walker, ``Coupled quantum-scattering modeling of thermoelectric properties of Si/Ge/Si quantum well structures,'' IMECE, Chicago, IL, November, 2006. [article] [slides] [poster]
A. Bulusu and D.G. Walker, ``Effect of Quantum Confinement on Thermoelectric Properties of 2D and 1D Semiconductor Thin Films,'' ITherm, San Diego, CA, June, 2006. [article]
D.G. Walker, ``Thermal rectification mechanisms including noncontinuum effects,'' Joint ASME-ISHMT Heat Transfer Conference, Guwahati, India, January, 2006. [article] [poster]
D.G. Walker, J.L. Davidson, K.L. Soh, P.G. Taylor, B. Rogers, "Bouyancy-Induced Convective Heat Transfer in Cylindrical Transformers Filled with Mineral Oil with Nano-Suspensions," International Mechanical Engineering Congress and Exposition (IMECE), Orlando, FL, November 2005, IMECE2005-81228. [article] [slides]
P.R. Crim and D.G. Walker, ``Transient Thermal Measurements Using Thermographic Phosphors for Temperature Rate Estimates,'' Summer Heat Transfer Conference, San Francisco, CA, July, 2005. [slides]
A. Bulusu and D.G. Walker, ``Modeling of electron transport in thin films with quantum and scattering effects,'' InterPack, San Francisco, CA, July, 2005. [slides]
A.M. Albadri, R.D. Schrimpf, D.G. Walker, S.V. Mahajan, ``Coupled electrothermal simulations of single-event burnout in power diodes,'' Nuclear and Space Radiation Effects Conference (NSREC), Seattle, WA, July, 2005. [slides]
S.P. Brophy and D.G. Walker, ``Case study of the pedagogical impact of tablet PCs as a presentation medium in large-scale engineering classrooms,'' ASEE Annual Meeting, Seattle, WA, July, 2005.
P.R. Crim, D.G. Walker, S.W. Allison and S. Goedeke, ``Reduction of thermographic phosphors data to heat rates,'' International Mechanical Engineering Congress and Exposition, Anaheim, CA, November, 2004.
R.D. Harvey, D.G. Walker and K.D. Frampton, ``Distributed Control to Improve Performance of Thermoelectric Coolers,'' International Mechanical Engineering Congress and Exposition, Anaheim, CA, November, 2004.
A. Bulusu and D.G. Walker, ``Thermal Modeling of Very Small Scale Devices,'' International Mechanical Engineering Congress and Exposition, Anaheim, CA, November, 2004.
D.G. Walker and K.D. Frampton, ``Distributed control of thermoelectric coolers,'' ITherm, Las Vegas, June, 2004
D.G. Walker and R.A. Weller, ``Phonon production and effects from ion strikes,'' IEEE Nuclear and Space Radiation Conference (NSREC), Atlanta, GA, July, 2004. [poster]
A. Marathe and D.G. Walker, ``Monte Carlo simulation of boundary scattering effects for power MOSFET performance,'' ASME International Mechanical Engineering Congress and Exposition, Washington DC, November 2003.
D.G. Walker and M.A. Stremler, ``Flexible chains in non-linear shear flows,'' ASME International Mechanical Engineering Congress and Exposition, Washington DC, November 2003. [slides]
D.G. Walker and J.A. Schetz, ``A New Technique for Heat Flux Determination,'' ASME Summer Heat Transfer Conference, Las Vegas, NV, July 2003. [article]
D.G. Walker and T.S. Fisher, ``Modeling of Carbon Nanotube Emission Using Airy Functions,'' ASME Summer Heat Transfer Conference, Las Vegas, NV, July 2003.
D.G. Walker and A. Tackett, ``Advancing Science through education in high-performance computing,'' ASEE Annual Conference and Exposition, Nashville, TN, June, 2003.
D.G. Walker and T.S. Fisher, ``Electron Transport and Anode Heating due to Field Emission from Carbon Nanotubes,'' International Mechanical Engineering Congress and Exposition, New Orleans, LA, November, 2002.
D.G. Walker, T.S. Fisher, A.M. Al-badri, R.D. Schrimpf, ``Single-Event Failure in Power Diodes,'' International Mechanical Engineering Congress and Exposition, New Orleans, LA, November, 2002. [article]
T.B. Smith, J.A. Schetz and D.G. Walker, ``Development and Ground Testing of Heat Flux Gages for High Enthalpy Supersonic Flight Tests,'' proceedings of the Joint AIAA/ASME Thermophysics Conference, St. Louis, MO, July, 2002.
T.S. Fisher, D.G. Walker and R.A. Weller, ``Analysis and Simulation of Anode Heating from Electron Field Emission,'' proceedings of ITherm, San Diego, CA, May 2002.
D.G. Walker, T.S. Fisher, J. Davidson, W.P. Kang, ``Parameter Estimation for Electron Field Emission,'' proceedings of the Applied Diamond Conference/Frontiers in Carbon Technology, Auburn, AL, August 2001.
S.H. Shin, T.S. Fisher, D.G. Walker, A.M. Strauss, W.P. Kang, J.L. Davidson, ``High-Temperature Electron Emission from Diamond Films for Energy Conversion Applications,'' proceedings of the International Vacuum Microelectronics Conference, Davis, CA, August 2001.
A. Raman, D.G. Walker and T.S. Fisher, ``Non-Equilibrium Thermal Effects in SOI Power Transistors,'' proceedings of IMECE, New York, NY, September 2001. [article]
J.J. Bezuidenhout, J.A. Schetz and D.G. Walker, ``Heat Flux Determination using Surface and Backface Temperature Histories and Inverse Methods,'' proceedings of the 37th Joint Propulsion Conference, Salt Lake City, Utah, July 2001. [article]
D.G. Walker, T.S. Fisher, J. Liu and R.D. Schrimpf, ``Thermal Characterization of Single Event Burnout Failure in Semiconductor Power Devices,'' proceedings of Semitherm, San Jose, CA, March 2000. [article]
D.G. Walker, T.S. Fisher, J. Ralston-Good and R.D. Schrimpf, ``A Parametric Study of Phonon Energy Transport in Semiconductor Devices,'' proceedings of 2000 International Mechanical Engineering Congress and Exposition, Orlando, FL, November 2000, HTD Vol 366-2, pp. 373-380.
T.S. Fisher and D.G. Walker, ``Direct Refrigeration by Electron Field Emission from Diamond Microtips,'' proceedings of 2000 International Mechanical Engineering Congress and Exposition, Orlando, FL, November 2000, HTD Vol. 366-2, pp. 325-330.
D.G. Walker and E.P. Scott, ``The Effects of Lateral Conduction on Heat Flux Estimation from Surface Temperature Measurements,'' proceedings of the 7th AIAA/ASME Joint Thermophysics Conference, Albuquerque, NM, Vol. 3, pp. 245-252, June 1998. [article]
D.G. Walker and E.P. Scott, ``Estimation of One-dimensional High Heat Fluxes from Surface Temperature Measurements using Inverse Solution Techniques,'' proceedings of the 1997 ASME National Heat Transfer Conference, Baltimore, MD, HTD-Vol. 340, Vol. 2, pp. 91-99, August 1997.
D.G. Walker and E.P. Scott, ``A Method for Improving Two-Dimensional High Heat Flux Estimates from Surface Temperature Measurements,'' proceedings of the 32nd AIAA Thermophysics Conference, AIAA-97-2574, Atlanta, GA, June 1997.
D.G. Walker and E.P. Scott, ``One-dimensional High Heat Flux Estimation from Discrete Temperature Measurements,'' proceedings of the 1995 International Mechanical Engineering Conference and Exposition, v. 317-1, p. 175, November 1995.
D.G. Walker, D.W. Mackowski and R.W. Knight, ``The Effects of Thermal Creep on Physical Vapor Transport in Micro-gravity Conditions,'' proceedings of the 32nd Annual Aerospace Sciences Meeting and Exhibit, AIAA-94-0567, Reno, Nevada, January 1994.

Other Publications

D.G. Walker and P.H. Tidwell, ``Self-Training for College Teaching,'' proceedings of the 1996 ASEE Annual Conference and Exposition, Session 2655, Washington D.C., June 1996.
D.G. Walker and E.P. Scott, ``One-dimensional Heat Flux Estimation from Discrete Temperature Measurements,'' proceedings of the 7th Inverse Problems in Engineering Seminar, Columbus, Ohio, June 1995.
D.G. Walker, ``Student Chapter Report: Virginia Tech Update,'' ASEE Prism, January, 1997, p. 40.

Thermal Engineering Lab

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Publications

Journal Publications

Book Chapters

Refereed Conference Publications

Other Publications