Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Journals

Detection of circular polarization in light scattered from photosynthetic microbes

May 12, 2009

Author(s)

William Sparks, James H. Hough, Thomas Germer, Feng Chen, Shiladitya DasSarma, Priya DasSarma, Frank Robb, Nadine Manset, Ludmilla Kolokolova, Neill Reid, F. D. Macchetto, William Martin

The identification of a universal biosignature that could be sensed remotely is critical to the prospects for success in the search for life elsewhere in the...

Grain boundaries exhibit the dynamics of glass-forming liquids

May 12, 2009

Author(s)

James A. Warren, Jack F. Douglas, Xuhang Tong, David J. Srolovitz

Polycrystalline materials are composites of crystalline particles or grains separated by thin amorphous grain boundaries (GBs). Although GBs have been...

Dipolar Chains formed by synthesized cobalt nanocubes

May 11, 2009

Author(s)

Guangjun Cheng, Robert D. Shull, Angela R. Hight Walker

Cobalt nanocubes with an average edge length of 50 nm and the epsilon crystalline structure were synthesized via thermo-decomposition in 1,2-dichlorobenzene at...

Measurement of Small Birefringence and Loss in a Nonlinear Single-mode Waveguide

May 11, 2009

Author(s)

Daniel Rogers, Charles W. Clark, Christopher Richardson, Julius Goldhar

We design and fabricate a birefringent semiconductor waveguide for application to nonlinear photonics, demonstrating that it is possible to engineer a small...

Near Edge X-Ray Absorption Fine Structure Spectroscopy Studies of Single-Crystalline V2O5 Nanowire Arrays

May 7, 2009

Author(s)

Daniel A. Fischer, J Velasquez, Cherno Jaye, S Banerjee

Near edge X-ray absorption fine structure (NEXAFS) spectroscopy is used to precisely probe the alignment, uniformity in crystal growth direction, and electronic...

A High-throughput Screening System for Thermoelectric Material Exploration Based on Combinatorial Film Approach

May 7, 2009

Author(s)

Makoto Otani, Evan L. Thomas, Winnie Wong-Ng, Peter K. Schenck, Nathan Lowhorn, Martin L. Green, Hiroyuki Ohguchi

A high-throughput system that consists of a combinatorial tool (a sputtering deposition tool and a pulsed laser deposition tool) and two property screening...

Weighted Means Statistics in Interlaboratory Studies

May 6, 2009

Author(s)

Andrew L. Rukhin

The usefulness of weighted means statistics as a consensus mean estimator in collaborative studies is discussed. A random effects model designed to combine...

Limestone Fillers to Conserve Cement in Low w/cm Concretes: An Analysis Based on Powers Model

May 5, 2009

Author(s)

Dale P. Bentz

Green concrete has become a rallying cry for the 21st century. In addition to field performance, concrete mixtures are now also judged by their energy...

Oligo(ethylene oxide) Self-Assembled Monolayers, with Self-limiting Packing Densities for the Inhibition of Nonspecific Protein Adsorption

May 5, 2009

Author(s)

David J. Vanderah, Ryan Vierling, Marlon L. Walker

We have created a molecule that forms self-assembled monolayers (SAMs) on Au possessing the characteristics for inhibition of nonspecific protein adsorption, i...

Raman and electron microscopy analysis of carbon nanotubes exposed to high power laser irradiance

May 5, 2009

Author(s)

John H. Lehman, Christopher L. Cromer, Krishna Ramadurai, Roop Mahajan, Anne Dillon

High power laser radiometry requires efficient and damage-resistant detectors. The current study explores the evolving nature of carbon nanotube coatings for...

A Fiber Placement Device and Methodology for preparing 2-D and 3-D Combinatorial Microcomposites

May 5, 2009

Author(s)

Jae Hyun Kim, John W. Hettenhouser, Chang K. Moon, Gale A. Holmes

A fiber placement device is described and methodology is given for proparing two dimensional and three dimensional combinatorial microcomposites. Although 2-D...

Spin dynamics and mode structure in nanomagnet arrays: effects of size and thickness on linewidth and damping

May 5, 2009

Author(s)

Justin M. Shaw, Thomas J. Silva, Michael L. Schneider, Robert D. McMichael

We use frequency resolved magneto-optic Kerr effect to probe the spin-dynamics and mode structure in 50 to 200 nm diameter Ni 80Fe 20 nanomagnets ranging from 3...

Highly Ordered Self-Assembly of 1D Nanoparticles in Phospholipids Driven by Curvature and Electrostatic Interaction

May 4, 2009

Author(s)

Tae-Hwan Kim, Shin-Hyun Kang, Changwoo Doe, Jun-Bo Sim, Jehan Kim, Steven Kline, Sung-Min Choi

Self-assembly of 1D nanoparticles such as carbon nanotubes or nanorods into highly ordered superstructures using various interactions has been of great interest...

Phonon softening and anomalous mode near the x_c = 0.5 quantum critical point inCa_2-xSr_xRuO₄

May 4, 2009

Author(s)

R. G. Moore, M. D. Lumsden, M. B. Stone, Jiandi Zhang, Ying Chen, Jeffrey Lynn, R. Jin, D Mandrus, E. W. Plummer

Inelastic neutron scattering is used to measure the temperature-dependent phonon dispersion in Ca2−xSrxRuO4(x=0.4,0.6). The in-plane Σ4 octahedral tilt mode...

Strategies for Advanced Applications of Permutation-Inversion Groups to the Microwave Spectra of Molecules with Large Amplitude Motions

May 4, 2009

Author(s)

Jon T. Hougen

This article presents permutation-inversion group-theoretical strategies and recipes that will help a high-resolution molecular spectroscopist attempting to use...

On the determination of C0 (or A0), D0K, H0K, and some dark states for symmetric-top molecules from infrared spectra without the need for localized perturbations

May 4, 2009

Author(s)

Alfons Weber, Jintao Zhang, Tony Masiello, Thomas A. Blake, J Nibler

For symmetric top molecules, the normal k = 0, l = 0 and k = 1, l = 1 selection rules for parallel and perpendicular bands, respectively, do not allow the...

Conflicting Observations Resolved by a Far IR and UV/Vis Study of the NO₃ Radical

May 4, 2009

Author(s)

Helmut Beckers, Helge Willner, Marilyn E. Jacox

By codeposition of NO/Ne and O2/Ne mixtures at 6 K, weakly bound complexes between O2 and NO are formed. They exhibit a strong, structured charge transfer UV...

Quantum radiometry

May 2, 2009

Author(s)

Sergey V. Polyakov, Alan L. Migdall

We review radiometric techniques that take advantage of photon counting and stem from the quantum laws of nature. We present a brief history of metrological...

Calculation of Relative Thermal Elongation of Structural Steels

May 2, 2009

Author(s)

Dilip K. Banerjee, Ursula R. Kattner

In the recent past, there has been a number of studies toward predicting the thermal and structural behavior of components subjected to elevated temperature due...

Electromagnetic Measurements for Counterfeit Detection of Radio-Frequency Identification Cards

May 2, 2009

Author(s)

Henry Romero, Kate Remley, Dylan Williams, Chih-Ming Wang

We investigate a technique for counterfeit detection of radio-frequency identification cards based on the electromagnetic characteristics of the cards rather...

Fourier Transform Spectrometry with a Near Infrared Supercontinuum Source

May 1, 2009

Author(s)

Chris A. Michaels, Tony Masiello, Pamela M. Chu

Optical fiber based supercontinuum light sources combine the brightness of lasers with the broad bandwidth of incandescent lamps and thus are promising...

Single-photon Sources

May 1, 2009

Author(s)

Matthew T. Rakher

Quantum-dot-based single-photon sources are fast and efficient and remain at the forefront of candidates for use in quantum information schemes.

Thermodynamics of the Hydrolysis Reactions of ±-D-galactose 1-phosphate, sn-glycerol 3-phosphate, 4 nitrophenyl phosphate, phosphocreatine, and 3-phospho-D-glycerate

May 1, 2009

Author(s)

Robert N. Goldberg, Brian E. Lang, Catherine T. Lo, David J. Ross, Yadu D. Tewari

Microcalorimetry, high-performance liquid chromatography, and an enzymatic assay have been used to conduct a thermodynamic investigation of five phosphate...

"Negative resistance" errors in four-point measurements of crossed-wire devices

May 1, 2009

Author(s)

Joshua M. Pomeroy, Holger Grube

"Negative resistance" errors due to non-uniform current distributions significantly distort the apparent electronic performance of devices formed with crossed...

Potential Primary Measurement Tool for the Quantification of DNA

May 1, 2009

Author(s)

Ryan G. Brennan, Savelas A. Rabb, Marcia J. Holden, Michael R. Winchester

An automated sample introduction system, utilizing a demountable direct injection high efficiency nebulizer (d DIHEN), is successfully incorporated for the...

Cut it out!

May 1, 2009

Author(s)

Isabel M. Beichl, Francis Sullivan

This is a tutorial article on a probabilistic method for finding minimum cut sets of a connected graph.

Influence of Internal Curing using Lightweight Aggregates on Interfacial Transition Zone Percolation and Chloride Ingress in Mortars

May 1, 2009

Author(s)

Dale P. Bentz

The microstructure of the interfacial transition zone (ITZ) between cement paste and aggregate depends strongly on the nature of the aggregate, specifically its...

Quantitative Measurement of the Polydispersity in the Extent of Functionalization of Glass Forming Resorcinarenes

May 1, 2009

Author(s)

William E. Wallace, Kathleen M. Flynn, Charles M. Guttman, David L. VanderHart, Vivek M. Prabhu, Anuja De Silva, Nelson Felix, Christopher K. Ober

The polydispersity in the degree of functionalization for two calix[4]resorcinarenes was determined by measuring their molecular mass distribution with matrix...

Nanoparticle assembly, DNA provides control

May 1, 2009

Author(s)

Vivek M. Prabhu, Steven D. Hudson

No abstract this is a Nature Materials News and Views (less than 800 word) article.

X-ray measurements at high-power lasers

May 1, 2009

Author(s)

Lawrence T. Hudson, C.I Szabo, Paul Indelicato, G.E. Gumberidze, G Holland, John F. Seely, Albert Henins, M Audebert, S. Bastiani-Ceccotti, E. Tabakhoff, E. Brambrink

Conversion efficiencies of laser light into K x-ray radiation are used to characterize laser-solid interactions e.g. in measurements with back-lighter targets...

Was this page helpful?