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

Physical Sciences and Mathematics Commons

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

Chemistry

Series

1996

Institution
Keyword
Publication
File Type

Articles 121 - 123 of 123

Full-Text Articles in Physical Sciences and Mathematics

Carbon Monoxide Amongst Other Chemicals (Presentation), Donald H. Stedman Jan 1996

Carbon Monoxide Amongst Other Chemicals (Presentation), Donald H. Stedman

Fuel Efficiency Automobile Test Publications

No abstract provided.


Epa Overestimates The Benefit Of Biennial Inspection And Maintenance, Donald H. Stedman Jan 1996

Epa Overestimates The Benefit Of Biennial Inspection And Maintenance, Donald H. Stedman

Fuel Efficiency Automobile Test Publications

The United States Environmental Protection Agency (EPA) computer model of mobile source emissions is used to estimate the benefits of future emissions control programs. Four input assumptions are discussed, each of which tends to overestimate the benefits of biennial testing programs. The assumptions are: each model year drives the same number of miles; high/superemitters, absent initially, increase linearly with mileage; inspection and maintenance (I/M) readings are invariant, and I/M repairs last forever. States opting for these programs should be aware that the predicted benefits may not materialize.


The Effect Of Atomic Hydrogen On The Growth Of Gallium Nitride By Molecular Beam Epitaxy, Zhonghai Yu, S. L. Buczkowski, N. C. Giles, T. H. Myers, Michelle Richards-Babb Jan 1996

The Effect Of Atomic Hydrogen On The Growth Of Gallium Nitride By Molecular Beam Epitaxy, Zhonghai Yu, S. L. Buczkowski, N. C. Giles, T. H. Myers, Michelle Richards-Babb

Faculty & Staff Scholarship

GaN was grown by molecular beam epitaxy using an rf plasma source. Growth under gallium‐rich conditions at 730 °C was required to produce high quality layers as indicated by photoluminescence, Hall effect, atomic force microscopy, and x‐ray diffraction measurements. Atomic hydrogen has a significant effect for Ga‐rich growth, increasing growth rates by as much as a factor of 2.