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Journals

Role of Microstructure in Dynamic Fatigue of Glass-Ceramics After Contact with Spheres

June 1, 2000

Author(s)

J G. Yeo, K -. Lee, Brian R. Lawn

Dynamic fatigue data are reported for fine- and coarse-grain micaceous glass-ceramics after contact damage with spheres. Strengths of indented specimens are...

Chemistry of NO₂ on CeO₂ and MgO: Experimental and Theorectical Studies on the Formation of NO₃

June 1, 2000

Author(s)

J A. Rodriguez, T Jirsak, S Sambasivan, Daniel A. Fischer, A Maiti

In environmental catalysis the destruction or removal of nitrogen oxides (DeNOx process) is receiving a lot of attention. Synchrotron-based x-ray absorption...

Multilevel Structure of Reinforcing Silica and Carbon

June 1, 2000

Author(s)

D W. Schaefer, T Rieker, M M. Agamalian, J S. Lin, Daniel A. Fischer, S Sukumaran, C I. Chen, G Beaucage, C Herd, J Ivie

We study the structure of colloidal silica and carbon on length scales from 0.25 -1 7 using x-ray, neutron and light scattering. These materials consist of...

Microwave Detection of Stress-Induced Fatigue Cracks in Steel and Potential for Crack Opening Determination

June 1, 2000

Author(s)

N Qaddoumi, E Ranu, Joseph D. McColskey, R Mirshahi, R Zoughi

Fatigue crack detection in metals is an important practical issure in many industries. In this paper the results of an investigation, using the dominat mode...

E-Glass/DGEBA/m-PDA Single Fiber Composites: The Effect of Strain Rate on Interfacial Shear Strength Measurements

June 1, 2000

Author(s)

Gale A. Holmes, R C. Peterson, Donald L. Hunston, Walter G. McDonough

In this paper, precise measurements of fiber break regions formed during the single fiber fragmentation testing procedure have been made for E-glass/diglycidyl...

High-Resolution Frequency Standard at 1030 nm for Yb : YAG Solid State Lasers

June 1, 2000

Author(s)

J Ye, L -. Ma, John L. Hall

A diode-pumped solid-state Yb:YAG laser has been stabilized to a high-finesse cavity with an all-external serve loop. Ultrasensitive cavity-enhanced frequency...

Bose Condensates in a Harmonic Trap Near the Critical Temperature

June 1, 2000

Author(s)

T Bergeman, D L. Feder, N L. Balazs, B I. Schneider

The mean-field properties of finite-temperature Bose-Einstein gases confined in spherically symmetric harmonic traps are surveyed numerically. The solutions of...

Elastic Scattering Loss of Atoms from Colliding Bose-Einstein Condensate Wave Packets

June 1, 2000

Author(s)

Y B. Band, M Trippenbach, J P. Burke, Paul S. Julienne

Bragg diffraction of atoms by light waves has been used to create high momentum components in a Bose-Einstein condensate. Collisions between atoms from two...

Valence-Shell Autoionization of NO

June 1, 2000

Author(s)

S H. Southworth, T A. Ferrett, Jonathan E. Hardis, Albert C. Parr, J L. Dehmer

Autoionization of valence and Rydberg states in NO over the 12.5-18 eV photon energy range was studied by vibrationally resolved photoelectron spectroscopy of...

Effects of Electron-Hole Interaction on the Dynamic Structure Factor: Application to Nonresonant Inelastic X-ray Scattering

June 1, 2000

Author(s)

J A. Soininen, Eric L. Shirley

We present a first-principles scheme for calculating the dynamic structure factor and inelastic x-ray scattering double-differential cross section for the...

Interferometric Measurement of Resonance Transition Wavelengths in CIV, SiIV, AlIII, Al II, and SiII

June 1, 2000

Author(s)

Ulf Griesmann, R Kling

The wavelength of the important ultraviolet diagnostic lines in the spectra C IV near 155 nm and Si IV near 139 nm were measured with a vacuum ultraviolet...

Laser Probing of Rotational-State-Dependent Velocity Distributions of N⁺₂ (Ņ= O,J) Drifted in He

June 1, 2000

Author(s)

E B. Anthony, V M. Basitan, V M. Bierbaum, S R. Leone

rotational state-resolved velocity component distribution functions of N + 2 (nu=O) drifted in helium are measured in a flow-drift apparatus by the technique of...

Direct Measurements of Rate Coefficients for the Reaction of Ethynyl Radical (C₂H) With C₂H₂ at 90 and 120 K Using a Pulsed Laval Apparatus

June 1, 2000

Author(s)

S Lee, D A. Samuels, R J. Hoobler, S R. Leone

Rate coefficients for the reaction C 2H + C 2H 2 -> C 4H 2 + H are measured at 90 and 120 K by using a new pulsed Laval nozzle apparatus equipped with laser...

Phase-Tailoring Molecular Wave Packets to Time-Shift Their Dynamics

June 1, 2000

Author(s)

Z Amitay, J B. Ballard, H U. Stauffer, S R. Leone

Time-shifting (up to a global arbitrary phase) of the dynamics of molecular wave packets, i.e., |dielectric flux}(t)> -> | dielectric flux} (t-t shift)>, is...

Reliability of Ultra-Thin Silicon Dioxide Under Combined Substrate Hot Electron and Constant Voltage Tunneling Stress

June 1, 2000

Author(s)

Eric M. Vogel, John S. Suehle, Bin Wang, Y Chen, J B. Bernstein

An experimental investigation of breakdown and defect generation under combined substrate hot electron and tunneling electrical stress of silicon oxide ranging...

Dynamic Input Capacitance of Single-Electron Transistors and the Effect on Charge-Sensitive Electrometers

June 1, 2000

Author(s)

Neil M. Zimmerman, Mark W. Keller

The 1.30 Angstrom Resolution Structure of Bascillus Subtillis Chorismate Mutase Catalytic Homotrimer

June 1, 2000

Author(s)

Jane E. Ladner, Prasad T. Reddy, A M. Davis, M Tordova, A Howard, G L. Gilliland

The crystal structure of the Bacillus subtilis chorismate mutase, an enzyme of the aromatic amino acids biosynthetic pathway, was determined to 1.30- resolution...

Equivalent Boundary Conditions for a Perfectly Conducting Periodic Surface with a Cover Layer

June 1, 2000

Author(s)

Christopher L. Holloway, Edward Kuester

Determination of non-ortho Polychlorinated Biphenyls in Environmental Standard Reference Materials

June 1, 2000

Author(s)

W. W. Brubaker, Michele M. Schantz, Stephen Wise

Photon-Assisted Tunneling in Electron Pumps

May 29, 2000

Author(s)

M. Covington, Mark W. Keller, Richard L. Kautz, John M. Martinis

We measure photon-assisted tunneling in 4- and 6-junction electron pumps at photon frequencies up to 60 GHz. We determine the microwave voltage at the pumps...

Electronic spectra and photophysics of the two stable conformers of anthracene dimer: evaluation of an ab initio structure prediction

May 26, 2000

Author(s)

Carlos A. Gonzalez, E C. Lim

Application of Electromodulated Fluorescence to the Study of the Dynamics of Alexa 488 Fluorophore Immobilized on a Gold Electrode

May 16, 2000

Author(s)

L. Li, Curtis W. Meuse, Vitalii I. Silin, Adolfas Gaigalas, Y. Z. Zhang

Alexa 488 fluorophores was immobilized on a gold electrode. The formation of the layer of fluorophore was followed in real time using surface plasmon resonance...

Mechanism of Neomycin and Rev Peptide Binding to the Rev Responsive Element of HIV-1 as Determined by Fluorescence and NMR Spectroscopy

May 16, 2000

Author(s)

K Lacourciere, J T. Stivers, John Marino

Rev is an essential HIV-1 regulatory protein that binds the Rev Responsive Element (RRE) within the env gene of the HIV-1 RNA genome and is involved in...

Sublethal Effects of Fire Smoke: Finding How to Include Them in Fire Safety Decisions

May 15, 2000

Author(s)

Richard G. Gann

It has long been realized that the sublethal effects of smoke can affect survival in fires, but only sparse data were available on which to base fire safety...

Laser-Focused Atomic Deposition - Nanofabrication via Atom Optics

May 15, 2000

Author(s)

Jabez J. McClelland, Robert Celotta

In conventional molecular-beam epitaxy, atoms from a diffuse source randomly impinge upon a surface, accumulating in atomic layers or islands. We have recently...

Compound semiconductor oxide antireflection coatings

May 15, 2000

Author(s)

K. J. Knopp, Richard Mirin, Kristine A. Bertness, Kevin L. Silverman, David H. Christensen

We report the development of high quality, broad-bandwidth, antireflection (AR) coatings using the low index provided by wet thermally oxidized Al 0.98Ga 0.02As...

Quasi-TEM Characteristic Impedance of Micromachined CMOS Coplanar Waveguides

May 5, 2000

Author(s)

Mehmet Ozgur, V. Milanovic, C. A. Zincke, Michael Gaitan, Mona E. Zaghloul

Micromachined coplanar waveguides fabricated in CMOS technology consist of glass-encapsulated finite-thickness metal conductor strips, fully suspended by...

A Millennial View of Fire Suppression

May 4, 2000

Author(s)

Richard G. Gann

The ability to control fire is universally and exclusively human. The history of that controlled use is also the history of civilization. Indeed, it has been so...

Progress Under the Next Generation Fire Suppression Technology Program (NGP)in 1999

May 4, 2000

Author(s)

Richard G. Gann

The goal of the Department of Defense's Next Generation Fire Suppression Technology Program is to develop and demonstrate, by 2005, technology for economically...

Standardization in Technology-Based Markets

May 1, 2000

Author(s)

Gregory C. Tassey

The complexity of modern technology, especially its system character, has led to an increase the number and variety of standards that affect a single industry...

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