Open Access. Powered by Scholars. Published by Universities.®

Physical Sciences and Mathematics Commons™

Open Access. Powered by Scholars. Published by Universities.®

1999

None

Articles 1 - 13 of 13

Full-Text Articles in Physical Sciences and Mathematics

Rule-Mitigated Collaboration Technology, Carl Chang, Alexei Vorontsov, Jia Zhang, Francis Quek Nov 1999

Rule-Mitigated Collaboration Technology, Carl Chang, Alexei Vorontsov, Jia Zhang, Francis Quek

Jia Zhang

No abstract provided.

Go to article

Accelerated Assessment And Selection Of Design Concepts In The Presence Of Qualitative Uncertainty And Imprecision, D. Verma, Caroline Lubert, W. Fabrycky Nov 1999

Accelerated Assessment And Selection Of Design Concepts In The Presence Of Qualitative Uncertainty And Imprecision, D. Verma, Caroline Lubert, W. Fabrycky

Caroline P Lubert

No abstract provided.

Go to article

Development And Student Use Of Web-Based Prelabs In Analytical Chemistry Courses, Mark Anderson, Brian Tissue Sep 1999

Development And Student Use Of Web-Based Prelabs In Analytical Chemistry Courses, Mark Anderson, Brian Tissue

Mark R. Anderson

No abstract is currently available.

Go to article

Ab Initio Calculation Of 81Br Nqr Transition Frequencies Of Brominated Aromatics (Flame Retardants), Chris R. Harwell, Anthony A. Mrse, Leslie G. Butler, Randall W. Hall Sep 1999

Ab Initio Calculation Of 81Br Nqr Transition Frequencies Of Brominated Aromatics (Flame Retardants), Chris R. Harwell, Anthony A. Mrse, Leslie G. Butler, Randall W. Hall

Randall W. Hall

Brominated aromatics, used extensively as flame retardants, have been studied with 81Br nuclear quadrupole resonance (NQR) spectroscopy. NQR requires lengthy frequency searches because 81Br NQR transition frequencies in brominated aromatics are spread over a wide (40 MHz) range. We investigate the ability of ab initio calculations to narrow this search range by predicting 81Br NQR transition frequencies for a series of brominated aromatics, using restricted Hartree−Fock (RHF) and Becke's three-parameter Lee−Yang−Parr density functional theory hybrid method (B3LYP). Basis sets used are of double and triple-ζ quality with varying degrees of polarization included on bromine. Geometries are the isolated molecules, with …

Go to article

Back To Basics – Statistics For Logisticians, Caroline Lubert Jul 1999

Back To Basics – Statistics For Logisticians, Caroline Lubert

Caroline P Lubert

No abstract provided.

Go to article

Voltammetry Of Metallofullerenes And Higher Fullerenes, Mark Anderson, Harry Dorn, Steven Stevenson, Susanne Dana May 1999

Voltammetry Of Metallofullerenes And Higher Fullerenes, Mark Anderson, Harry Dorn, Steven Stevenson, Susanne Dana

Mark R. Anderson

No abstract is currently available.

Go to article

Statistics For Logisticians – Back To Basics, Caroline Lubert Apr 1999

Statistics For Logisticians – Back To Basics, Caroline Lubert

Caroline P Lubert

No abstract provided.

Go to article

A Reappraisal Of Article I, Section 27, John Dernbach Dec 1998

A Reappraisal Of Article I, Section 27, John Dernbach

John C. Dernbach

No abstract provided.

Go to article

Statistical Analysis Of Reliability, Maintainability And Supportability Data, Caroline Lubert Dec 1998

Statistical Analysis Of Reliability, Maintainability And Supportability Data, Caroline Lubert

Caroline P Lubert

No abstract provided.

Go to article

Geodynamic Interpretation Of Regional Unconformities: Research Fund Eustacy Or Tectonics?, Daniel Goldman Dec 1998

Geodynamic Interpretation Of Regional Unconformities: Research Fund Eustacy Or Tectonics?, Daniel Goldman

Daniel Goldman

Funding agency: Petroleum Research Fund Investigators: C.E. Mitchell, Dr. Goldman Amount: $ 6,500.00

Go to article

Growth Of Oriented Thick Films Of Gallium Nitride From The Melt., Jeffrey Dyck, K. Kash, M. Grossner, C. Hayman, A. Argoitia, N. Yang, M.-H. Hong, M. Kordesch, J. Angus Dec 1998

Growth Of Oriented Thick Films Of Gallium Nitride From The Melt., Jeffrey Dyck, K. Kash, M. Grossner, C. Hayman, A. Argoitia, N. Yang, M.-H. Hong, M. Kordesch, J. Angus

Jeffrey Dyck

While significant strides have been made in the optimization of GaN-based devices on foreign substrates, a more attractive alternative would be homoepitaxy on GaN substrates. The primary motivation of this work is to explore the growth of thick films of GaN from the melt for the ultimate use as substrate material. We have previously demonstrated the synthesis of polycrystalline, wurtzitic gallium nitride and indium nitride by saturating gallium metal and indium metal with atomic nitrogen from a microwave plasma source. Plasma synthesis avoids the high equilibrium pressures required when molecular nitrogen is used as the nitrogen source. Here we report …

Go to article

Changes In The Fermi Surface At The Magnetization Reorientation Transition In Fe/Cu(100), Reginaldt H. Madjoe, Alexey N. Koveshnikov, Christopher Harwell, Randall W. Hall, Roger L. Stockbauer, Richard L. Lutz Dec 1998

Changes In The Fermi Surface At The Magnetization Reorientation Transition In Fe/Cu(100), Reginaldt H. Madjoe, Alexey N. Koveshnikov, Christopher Harwell, Randall W. Hall, Roger L. Stockbauer, Richard L. Lutz

Randall W. Hall

We present a study of the evolution of the valence bandstructure of Fe/Cu(100) as a function of Fe coverage in the 0–12 monolayer range. Angle-resolved photoelectron spectroscopy was used to probe the valence electronic structure and to extract Fermi surface contours as a function of increasing Fe coverage. The first few monolayers show Fe-induced densities of states that are significantly different from those in thicker films. At 5 ML, distinct changes occur in the Fermi surface, where a magnetization reorientation transition has been observed previously.

Go to article

Single-Crystal 27Al Nmr Of Andalusite And Calculated Electric Field Gradients: The First Complete Nmr Assignment For A 5-Coordinate Aluminum Site, Pamela L. Bryant, Chris R. Harwell, Katherine Wu, Frank R. Fronczek, Randall W. Hall, Leslie G. Butler Dec 1998

Single-Crystal 27Al Nmr Of Andalusite And Calculated Electric Field Gradients: The First Complete Nmr Assignment For A 5-Coordinate Aluminum Site, Pamela L. Bryant, Chris R. Harwell, Katherine Wu, Frank R. Fronczek, Randall W. Hall, Leslie G. Butler

Randall W. Hall

Andalusite, Al2SiO5, contains 5- and 6-coordinate aluminum sites, and is a preeminent model for 27 Al NMR spectroscopy. We describe a combined NMR, crystallography, and theory project:  single-crystal 27 Al NMR spectra at 298 K, the crystal structure of andalusite at 115 K, and electric field gradient calculations. The low-symmetry 5-coordinate site is a stiff test of the computational methods. In addition, the chemical shift tensor is measured for the 5-coordinate site. The small body of 27 Al NMR data, especially for rare 5-coordinate sites, inspires the calculation of NMR parameters. We explore the accuracy of two approaches for 27 …

Go to article