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Journals

Achieving High Absolute Accuracy for Group-Delay Measurements Using the Modulation Phase-Shift Technique

November 1, 2005

Author(s)

Tasshi Dennis, Paul A. Williams

We have developed a modulation phase shift (MPS)system for measuring relative group delay (RGD)in optical components with high absolute accuracy and...

Theory of the Frequency Comb Output from a Femtosecond Fiber Laser

November 1, 2005

Author(s)

Nathan R. Newbury, Brian Washburn

The output of a femtosecond fiber laser will form a frequency comb that can be phase-locked through feedback to the cavity length and pump power. A perturbative...

Restructuring of Tungsten Thin Films Into Nanowires and Hollow Square Cross-Section Microducts

November 1, 2005

Author(s)

P. M. Parthangal, Richard E. Cavicchi, Christopher B. Montgomery, Shirley Turner, Michael R. Zachariah

We report on the growth of nanowires and unusual hollow microducts of tungsten by thermal treatment of tungsten films in a RF H2/Ar plasma at temperatures...

Characterization of Candles Flames as Ignition Sources

November 1, 2005

Author(s)

Scott E. Dillon, Anthony Hamins, Matthew Bundy

Common household open flame and radiant ignition sources are the actual or suspected cause for many fires. Because of their popular use, fire investigators have...

Optimized Transition-Edge X-ray Microcalorimeter with 2.4 eV Energy Resolution at 5.9 keV

November 1, 2005

Author(s)

Joel Ullom, James A. Beall, W.Bertrand (Randy) Doriese, William Duncan, S. L. Ferreira, Gene C. Hilton, Kent D. Irwin, Carl D. Reintsema, Leila R. Vale

We present measurements from a series of transition- edge x-ray microcalorimeters designed for optimal energy resolution. We used the geometry of the sensors to...

Conductance and ion selectivity of a mesoscopic protein nanopore probed with cysteine scanning mutagenesis

November 1, 2005

Author(s)

Petr Merzlyak, Maria-Fatima P. Capistrano, Angela Valeva, John J. Kasianowicz, Oleg V. Krasilnikov

Nanometer-scale, proteinaceous pores are the basis of ion and macromolecular transport in cells and organelles. Recent studies suggest that ion channels and...

The Influence of Clay and Elastomer Concentration on the Morphology and Fracture Energy in Preformed Acrylic Rubber Dispersed Clay Filled Epoxy Nanocomposites

November 1, 2005

Author(s)

G Balakrishnan, P R. Start, D T. Raghavan, Steven Hudson, D Yebassa

The influence of toughener and clay concentration on the morphology and mechanical properties of three-phase, rubber-modified epoxy nanocomposites was studied...

Analyzing Carbon Fiber Composite Materials with Equivalent Layer

November 1, 2005

Author(s)

Christopher L. Holloway, M. S. Sarto, Martin Johansson

The purpose of this paper is toinvestigate the use of effective layer models for the analysis of carbon fiber composite materials. In this paper, we present...

Reflection and Transmission Properties of a Metafilm with Application to a Controllable Surface Composed of Resonant Particles

November 1, 2005

Author(s)

Christopher L. Holloway, Mohamed Mohamed, Edward Kuester

In recent work, we derived generalized sheet transition conditions (GSTCs) for the average electromagnetic fields across a metafilm, which, when properly...

Realization of a Controllable Metafilm (''Smart Surface'') Composed of Resonant Magnetodielectric Particles: Measurements and Theory

November 1, 2005

Author(s)

Christopher L. Holloway, Pavel Kabos, Mohamed Mohamed, Edward Kuester, Michael D. Janezic, James R. Baker-Jarvis

In previous work, we derived generalized sheet-transition conditions (GSTCs) for the average electromagnetic fields across a metafilm, which, when properly...

Automation of Bridge Fabrication and Rapid Repair

November 1, 2005

Author(s)

Thomas A. Siewert, Krishna Verma Verma, Stuart Chen

Over the past 6 years, the Federal Highway Administration (FHWA) Office of Bridge Technology has been working with other government agencies and industry groups...

Combinatorial Investigation of the Structure-Properties Characterization of Dental Materials

October 29, 2005

Author(s)

Sheng Lin-Gibson, Forrest A. Landis, P L. Drzal

The effects of co-monomer composition and irradiation time in a model two-component dimethacrylate dental resin blend were evaluated using combinatorial methods...

Ab Initio Relativistic Calculation of the RbCs Molecule

October 28, 2005

Author(s)

Svetlana A. Kotochigova, Eite Tiesinga

We apply the relativistic configuration interaction valence bond method to calculate various characteristics of the alkali-metal RbCs dimer. These include the...

Wave Numbers and Ar Pressure-Induced Shifts of 198Hg Atomic Lines Measured by Fourier Transform Spectroscopy

October 28, 2005

Author(s)

D. Veza, Marc L. Salit, Craig J. Sansonetti, John C. Travis

Wave numbers and argon-pressure-induced shifts of mercury emission lines were measured using a UV/visible Fourier transform spectrometer (FTS). The observations...

Multichannel Quantum-Defect Theory for Slow Atomic Collisions

October 28, 2005

Author(s)

B Gao, Eite Tiesinga, Carl J. Williams, Paul S. Julienne

We present a multichannel quantum-defect theory for slow atomic collisions that takes advantages of the analytic solutions for the long-range potential, and...

A BBGKY-based density gradient approximation of interparticle forces: Application for discrete Boltzman methods

October 26, 2005

Author(s)

Nicos Martys

The force term accounting for intermolecular interactions, with application to discrete Boltzmann simulation methods, is derived directly using a density...

Cross-Property Correlations and Permeability Estimation in Sandstone

October 26, 2005

Author(s)

C H. Arns, M A. Knackstedt, Nicos Martys

Results from a numerical study examining the cross-property correlations linking fluid permeability to conductive properties and to a number of pore size...

Display Daylight Ambient Contrast Measurement Methods and Daylight Readability

October 25, 2005

Author(s)

Edward F. Kelley, Max Lindfors, John Penczek

We propose a composite measurement method to characterize display performance and readability under both daylight and sunlight illumination. The measurements...

Rapid formation of soft hydrophilic silicone elastomer surfaces

October 24, 2005

Author(s)

K Efimenko, J A. Crowe, E Manias, D W. Schwark, Daniel A. Fischer, Jan Genzer

Acoustic Modes and Elastic Properties of Polymeric Nanostructures

October 21, 2005

Author(s)

R Hartschuh, A Kisliuk, V N. Novikov, Alexei Sokolov, Paul R. Heyliger, Colm Flannery, Ward L. Johnson, Christopher Soles, Wen-Li Wu

Fabricating mechanically robust polymer structures with nanoscale dimensions is critical for a wide range of emerging technologies. The rigidity of such...

Rotating-radio-frequency ion traps

October 20, 2005

Author(s)

T Hasegawa, John J. Bollinger

We propose a new ion trap, the rotating-rf trap, in which motion of a charged particle is described not by Mathieu-type functions but by trigonometric functions...

Radiometric Validation of NASA's Ames Research Center's Sensor Calibration Laboratory

October 20, 2005

Author(s)

Steven W. Brown, Bettye C. Johnson, S F. Biggar, E F. Zalewski, J W. Cooper, P Hajek, E Hildum, P Grant, R Barnes, James J. Butler

Towards a Methodology for the Characterization of Fire Protection Materials With Respect to Thermal Performance Models

October 12, 2005

Author(s)

Dale P. Bentz, Kuldeep R. Prasad, Jiann C. Yang

A methodology is proposed for the characterization of fire protection materials with respect to thermal performance models. Typically in these models, materials...

Precise Calculation of Transition Frequencies of Hydrogen and Deuterium Based on a Least-Squares Analysis

October 11, 2005

Author(s)

U Jentschura, Svetlana A. Kotochigova, E-O Le Bigot, Peter J. Mohr, Barry N. Taylor

Theoretical values of transition frequencies of hydrogen and deuterium are given, based on the most accurate measurements together with the results of recent...

Sodium Bose-Einstein Condensates in an Optical Lattice

October 10, 2005

Author(s)

K Xu, Y Liu, J R. Abo-Shaeer, T Mukaiyama, J K. Chin, D E. Miller, W Ketterle, Kevin Jones, Eite Tiesinga

The phase transition from a superfluid to a Mott insulator has been observed in a 23Na Bose-Einstein condensate. A dye laser detuned 5 nm red of the Na 3 ^2S...

Interstellar Isomers: The Importance of Bonding Energy Differences

October 10, 2005

Author(s)

A J. Remijan, J M. Hollis, Francis J. Lovas, David F. Plusquellic, P R. Jewell

We present new observations of large cyanide molecules and their corresponding isocyanide isomers toward the Sgr B2(N)molecular cloud. We report the first...

Sub-Natural-Linewidth Quantum Interference Features Observed in Photoassociation of a Thermal Gas

October 7, 2005

Author(s)

R Dumke, J D. Weinstein, M Johanning, Kevin Jones, Paul D. Lett

By driving photoassociation transitions we form electronically excited molecules (Na$_2^*$) from ultra-cold (50-300 $\mu$K) Na atoms. Using a second laser to...

Epitaxial growth of rhenium with sputtering

October 6, 2005

Author(s)

Seongshik Oh, Dustin P. Hite, Katarina Cicak, Kevin Osborn, Raymond W. Simmonds, Robert Mcdermott, Ken B. Cooper, Matthias Steffen, John M. Martinis, David P. Pappas

We have grown epitaxial renium (0001) films on α-Al 2O 3(0001) substrates using sputter deposition in an ultra high vacuum system. We find that better epitaxy...

Novel Fabrication of Micromechanical Oscillators With Nanoscale Sensitivity at Room Temperature

October 5, 2005

Author(s)

Michelle Chabot, John M. Moreland, Lan Gao, Sy-Hwang Liou, C. W. Miller

In this paper, we report on the design, fabrication, and implementation of ultrasensitive micromechanical oscillators. Our ultrathin single-crystal silicon...

Direct Correlation of Organic Semiconductor Film Structure to Field-Effect Mobility

October 4, 2005

Author(s)

Dean M. DeLongchamp, S Sambisavia, Daniel A. Fischer, Eric K. Lin, Paul C. Chang, A R. Murphy, J M. Frechet, V Subramanian

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