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Displaying 42801 - 42825 of 74202

Design and Use of a Peptide Nucleic Acid for Detection of the Heteroplasmic Low-Frequency Mitochondrial Encephalomyopathy, Lactic Acidosis, and Stroke-Like Episodes (MELAS) Mutation in Human Mitochondrial DNA

December 1, 2002
Author(s)
Diane K. Hancock, Frederick P. Schwarz, F H. Song, L J. Wong, Barbara C. Levin
Most pathogenic human mitochondrial DNA (mtDNA) mutations are Heteroplasmic and are difficult to detect when present at very low levels in a population of normal mtDNA molecules. This paper describes a simple methodology to detect low levels of the single

Diederik J. Korteweg, Pioneer of Criticality

December 1, 2002
Author(s)
Johanna Levelt Sengers, A H. Levelt
Dutch mathematician Diederik Johannes Korteweg (1848-1941), pictured in figure 1, is best known for the 1895 paper he wrote with his student Gustav De Vries. This paper on the propagation of soliton waves in channels, has, in recent decades, been widely

Direct Separation of Short Range Order in Intermixed Nanocrystalline and Amorphous Phases

December 1, 2002
Author(s)
Charles E. Bouldin, A I. Frenkel, A V. Kolobov, I K. Robinson, J O. Cross, Y Maeda
Diffraction Anomalous Fine Structure (DAFS) and Extended X-Ray Absorption Fine Structure (EXAFS) measurements have been combined to determine short-range order (SRO) about a single atomic type in a sample of mixed amorphous and nanocrystalline phases

Effect of Wind Velocity on Flame Spread in Microgravity

December 1, 2002
Author(s)
Kuldeep R. Prasad, S L. Olson, Y N. Nakamura, K K. Nishizawa, K. Ito, Takashi Kashiwagi
A three-dimensional, time-dependent model is developed describing ignition and subsequent transition to flame spread over a thermally thin cellulosic sheet heated by external radiation in a microgravity environment. A low Mach number approximation to the

Effects of Melt-Processing Conditions on the Quality of Poly(ethylene terephthalate) Montmorillonite Clay Nanocomposites

December 1, 2002
Author(s)
Cher H. Davis, L J. Mathias, Jeffrey W. Gilman, D Schiraldi, Paul C. Trulove, T X. Suttos, H X. DeLong
The effects of melt intercalation processing conditons on the quality of poly(ethylene terephthalate) montmorillonite clay nanocomposites have been investigated by thermal gravametric analysis (TGA), X-ray diffraction XRD), and transmission electronic

Electrical and Optical Properties of GaN/Al 2 O 3 Interfaces

December 1, 2002
Author(s)
D C. Look, R L. Jones, X L. Sun, L J. Brillson, J W. Ager, S S. Park, J H. Han, R J. Molnar, James E. Maslar
Hall-effect, photoluminescence (PL), cathodoluminescence (CL), and Raman scattering measurements have been used to characterize the Ga (top) and N (bottom) faces of freestanding GaN layers grown by hydride vapor phase epitaxy on Al2O3. The material near

Electron Interactions with BCL 3

December 1, 2002
Author(s)
Loucas G. Christophorou, James K. Olthoff
In this paper we review and assess the cross sections for collisions of low-energy electrons with boron trichloride (BCI3). The only available experimental cross section data are for partial and total ionization and electron attachment, and the electron

Enthalpies of Formation of SrPbO 3 and Sr 2 PbO 4

December 1, 2002
Author(s)
R Klein, Lawrence P. Cook, Winnie K. Wong-Ng
Alkaline-earth plumbates are important accessory phases in (Bi,Pb)-Sr-Ca-Cu-O (BSCCO) high temperature superconductor materials. Reliable values for standard enthalpies of formation (D f H o) of the plumbates are therefore an essential part of the BSCCO

External Laser Stabilization

December 1, 2002
Author(s)
John L. Hall
The summary of this epoch is two fold: first there now are real professional tools such as SimuLink that allow one to study electronic and other control systems. But the particular chips chosen, while fast, were new and quite tweeky, and prone to

Extinction of Cup-Burner Diffusion Flames by Catalytic and Inert Inhibitors

December 1, 2002
Author(s)
Gregory T. Linteris
The first tests of super-effective flame inhibitors blended with CO2 have been performed in methane-air co-flow diffusion flames. Although the organometallic agents used are typically one or two orders of magnitude more effective inhibitors than CF3Br when

Fire Safety of Passenger Trains, Phase II: Application of Fire Hazard Analysis Techniques

December 1, 2002
Author(s)
Richard D. Peacock, Paul A. Reneke, Jason D. Averill, Richard W. Bukowski, J H. Klote
As part of the passenger equipment rulemaking required by Congress, the Federal Railroad Adminstration (FRA) has issued new requirements making its existing fire safety guidelines mandatory. Part of this fire safety rule requires fire hazard analyses for
Displaying 42801 - 42825 of 74202
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