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Journals

Numerical Path-Integration Calculation of Transport Properties of Star Polymers and theta-DLA Aggregates

December 1, 2002

Author(s)

M Mansfield, Jack F. Douglas

Although the calculation of transport properties of complex-shaped particles (Smoluchowki rate constants for diffusion-limited reactions, Stokes friction...

Solvophobically Driven Self-Assembly of Chiral Supramolecular Dendrimers

December 1, 2002

Author(s)

Virgil Percec, A E. Dulcey, Y Miura, U Edlund, V S. Balagurusamy, Steven Hudson, H Duan, Paul A. Heiney

The self assembly in dilute solution of chiral supramolecular dendrimers is investigated by circular dichroism (CD) spectroscopy. These results are compared...

Cavitation of Polyethylene During Extrusion Processing Instabilities

December 1, 2002

Author(s)

Y Son, Kalman D. Migler

We present observations of cavitation that occur inside a capillary die during extrusion of a polyethylene. This phenomenon is observed over the last 1.5 mm of...

Amorphous Solidification in Polymer-Platelet Nanocomposites

December 1, 2002

Author(s)

S Salaniwal, S K. Kumar, Jack F. Douglas

Computer simulations are used to understand the molecular basis of mechanical reinforcement of platelet-filled polymers when the polymer and nanofiller interact...

Effect of Nonresonant Frequencies on the Enhancement of Quantum Beat Amplitudes in Rovibrational States of Li₂: The Role of State Spacing

December 1, 2002

Author(s)

E Mirowski, H U. Stauffer, J B. Ballard, B Zhang, C L. Hetherington, S R. Leone

Optical phase manipulation of nonresonant frequencies is investigated as a method of achieving optimal population transfer during a resonant impulsive...

High Resolution Vib-Rotational Analysis of the v}₃ and v}₄ Spectral Regions of Chlorine Nitrate

December 1, 2002

Author(s)

J.- M. Flaud, J Orphal, Walter J. Lafferty, M Birk, G Wagner

High resolution Fourier transform spectra of isotopically natural pure chlorine nitrate, CION0 2, were recorded with a resolution of 0.00094 cm -1 at...

Accurate Reflectometry for Extreme-Ultraviolet Lithography at the National Institute of Standards and Technology

December 1, 2002

Author(s)

S Grantham, Charles Tarrio, Thomas B. Lucatorto

The most demanding application of extreme ultraviolet (EUV) multilayer optics is in lithography. The optics in current alpha-class tools are large, and the...

Many-Body Levels of Optically Excited and Multiple Charged InAs Nanocrystals Modeled by Semiempirical Tight Binding

December 1, 2002

Author(s)

S Lee, J Kim, P. Jonsson, J W. Wilkins, Garnett W. Bryant, G Klimeck

Many-body levels of optically excited and multiple charged InAs nanocrystals are studied with the empirical tight-binding model. Single-particle levels of...

Intensity Effects in Ultracold Photoassociation Line Shapes

December 1, 2002

Author(s)

A Simoni, Paul S. Julienne, Eite Tiesinga, Carl J. Williams

We derive ultracold atom-atom photoassociation line shapes valid for intense light fields and investigate laser power effects in sodium and rubidium...

Rotational Spectrum of the Weakly Bonded C₆H₆-H₂S dimer and Comparisons to C₆H₆-H₂O Dimer

December 1, 2002

Author(s)

E Arunan, T Emilsson, H S. Gutowsky, Gerald T. Fraser, G de Oliveira, C E. Dykstra

Tow symmetric-top, δJ = 1 progressions were observed for the C 6H 6-H 2S dimer using a pulsed nozzle Fourier transform microwave spectrometer. The ground-state...

Rotational Spectrum of Jet-Cooled HfO₂ and HfO

December 1, 2002

Author(s)

A Lesarri, R D. Suenram, D J. Brugh

The rotational spectrum of jet-cooled hafnium dioxide obtained by laser ablation of a solid ceramic rod has been investigated by Fourier transform microwave...

X-Ray Spectroscopy of Trapped Ions With a Microcalorimeter on the NIST Electron Beam Ion Trap

December 1, 2002

Author(s)

E Takacs, John D. Gillaspy, L P. Ratliff, K Makonyi, J M. Laming, E Silver, H. Schnopper, M Barbera, J. Beeman, E. E. Haller, N. Madden

The electron beam ion trap (EBIT) was invented about 15 years ago. Judging from the wide range of experiments performed on the machine since its inception...

Bulk and Surface Contributions to Resonant Second -Harmonic Generation From Si(001) Surfaces

December 1, 2002

Author(s)

Y Q. An, Steven T. Cundiff

The spectra of the isotropic and anisotropic contributions to second-harmonic generation from modified Si (001)surfaces are separated using polarization...

Electrical and Optical Properties of GaN/Al₂O₃ 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)...

Isopiestic Determination of the Osmotic and Activity Coefficients of K₂SO₄(aq) at the Temperatures 298.15 and 323.15 K, and Revision of the Thermodynamic Properties of the K₂SO₄ + H₂O System

December 1, 2002

Author(s)

D A. Palmer, Donald G. Archer, J A. Rard

Isopiestic vapor-pressure measurements were made for K 2SO 4(aq) from 0.228 to 0.740 mol .kg -1 at 298.15 k and from 0.219 to 0.957 mol .kg -1 at 323.15 K...

Interleaved, Sampled Fiber Bragg Gratings for use in Hybrid Wavelength References

December 1, 2002

Author(s)

Michael W. Rabin, William C. Swann, Sarah L. Gilbert

We discuss the design and fabrication of interleaved, sampled fiber Bragg gratings (ISFBGs) for use in hybrid wavelength calibration references covering the...

Characterisation of the Response of Chromium-Doped Alumina Screens in the Vacuum Ultraviolet Using Synchrotron Radiation

December 1, 2002

Author(s)

James K. McCarthy, A Baciero, B Zurro, Uwe Arp, Charles Tarrio, Thomas B. Lucatorto, A Morono, P Martin, E R. Hodgson

We have measured the response of chromium-doped alumina screens to vacuum ultraviolet radiation and derived quantum efficiency curves for the energy range from...

A Reactive Molecular Dynamics Model of Thermal Decomposition in Polymers: I.Poly(methyl methacrylate)

December 1, 2002

Author(s)

S I. Stoliarov, P R. Westmoreland, Marc R. Nyden, Glenn P. Forney

The theory and implementation of Reactive Molecular Dynamics (RMD) are presented in the context of providing an overview of our own RMD computer code, MD_REACT...

Modeling the Performance of a Naturally Ventilated Commercial Building With a Multizone Coupled Thermal/Airflow Simulation Tool.

December 1, 2002

Author(s)

James W. Axley, Steven Emmerich, George Walton

Naural ventilation systems have long been employed in European residences to control indoor air quality and provide thermal comfort. European building designers...

Evaluation of Carbon Dioxide as R-22 Substitute for Residential Air-Conditioning.

December 1, 2002

Author(s)

J S. Brown, Y Kim, Piotr A. Domanski

This paper compares the performance of CO2 and R-22 in residential air-conditioning applications using semi-theoretical vapor compression and transcritical...

Cone Calorimeter Combustion and Gasification Studies of Polymer Layered Silicate Nanocomposites.

December 1, 2002

Author(s)

M Zanetti, Takashi Kashiwagi, L Falqui, G Camino

Database-Assisted Wind Load Capacity Estimates for Low-Rise Steel Frames

December 1, 2002

Author(s)

S Jang, L L. Lu, Fahim H. Sadek, Emil Simiu

A comparative study is presented of the estimated wind load capacities of low-rise steel building frames based on loading patterns (magnitude and distribution)...

A Monolithic CMOS Microhotplate-based Gas Sensor System

December 1, 2002

Author(s)

Muhammad Afridi, John S. Suehle, Mona E. Zaghloul, David W. Berning, Allen R. Hefner Jr., Richard E. Cavicchi, Stephen Semancik, C B. Montgomery, C J. Taylor

A monolithic CMOS microhotplate-based conductance type gas sensor system is described. A bulk micromachining technique is used to create suspended microhotplate...

Large Area, Ultra-high Voltage 4H-SiC PiN Rectifiers

December 1, 2002

Author(s)

Ranbir Singh, Kenneth G. Irvine, D C. Capell, James Richmond, David W. Berning, Allen R. Hefner Jr., John W. Palmour

This paper reports the design, fabrication, and high temperature characteristics of 1 mm 2, 4 mm 2, and 9 mm 2 4H-SiC rectifiers with 6 kV, 5 kV, and 10 kV...

Deciphering Piezoelectric and Surface Charge Effects in Hydroxyapatite Osteoconduction via Piezoresponse Force Microscopy

November 30, 2002

Author(s)

Youngjoon Han, Jeongjae Ryu, Andreas Schiffer, Jason Killgore, Seungbum Hong

Electrical properties of hydroxyapatite (HAp), the main constituent of the mineralized portion of the cortical bone, and a key variable in Wolff's law, remain...

Change in Low Temperature Thermodynamic Functions of a Solid Due to Quantum Dots

November 27, 2002

Author(s)

Vinod K. Tewary

Simple expressions are derived for the spectrum of low frequency phonon modes perturbed bythe presence of a quantum dot in a solid using the phonon Green's...

Reaction Mechanism of Chorismate Mutase Studied by the Combined Potentials of Quantum Mechanics and Molecular Mechanics

November 21, 2002

Author(s)

Y. S. Lee, S. E. Worthington, Morris Krauss, B R. Brooks

The reaction path for the rearrangement of chorismate to prephenate has been determined in a QM/MM study including the entire protein environment while treating...

Regression Procedure for Determining the Dopant Profile in Semiconductors from Scanning Capacitance Microscopy Data

November 15, 2002

Author(s)

Jay F. Marchiando, Joseph Kopanski

To develop a regression procedure to correlate scanning capacitance microscope data with dopant concentration in three dimensions, the inverse problem is...

Structural Effects on the Magnetic Character of Yttrium-Iron-Garnet Nanoparticles Dispersed in Glass Composites

November 13, 2002

Author(s)

S Taketomi, Alexander J. Shapiro, Robert D. Shull

We obtained dispersed-nanocrystal/glass composites by impregnating amorphous yttrium iron garnet (YIG) nanoparticles (made by an alkoxide method) into the 49...

Structural Effects on the Matgnetic Character of Yttrium-Iron-Garnet-Nanoparticles Dispersed in Glass Composites

November 13, 2002

Author(s)

S Taketomi, Alexander J. Shapiro, Robert D. Shull

By absorbing amorphous yttrium iron garnet (YIG) nanoparticles into the nanometer pores of the sponge-like structure of porous silica glass (controlled pore...

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