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

Three Dimensionally Structured Interdigitated Back Contact Thin Film Heterojunction Solar Cells.

April 8, 2011

Author(s)

Carlos M. Hangarter, Behrang H. Hamadani, Jonathan E. Guyer, Hua Xu, Ryan F. Need, Daniel Josell

Three dimensionally structured thin film photovoltaic devices based on interdigitated arrays of microscale electrodes are examined. This geometry eliminates...

Three-Dimensionally Structured CdS/CdTe Photovoltaics on Dual Interdigitated Back-Contacts

April 8, 2011

Author(s)

Carlos M. Hangarter, Behrang Hamadani, Ryan F. Need, Carlos R. Beauchamp, Hua Xu, John E. Bonevich, Nikolai Zhitenev, Daniel Josell

The fabrication and properties of three-dimensionally structured CdS/CdTe solar cells with back-contacts are described. Fabrication entails electrodeposition of...

Feshbach spectroscopy and analysis of the interaction potentials of ultracold sodium

April 8, 2011

Author(s)

T. Schuster, R. Scelle, A. Trautmann, J. Appmeier, S. Knoop, Eite Tiesinga, E. Tiemann

We have studied magnetic Feshbach resonances in an ultracold sample of Na prepared in the absolute hyperfine ground. W e report on the observation of three s-...

Intermolecular potential energy surface and second virial coefficients for the water-CO2 dimer

April 7, 2011

Author(s)

Allan H. Harvey, Richard J. Wheatley

The first complete five-dimensional potential energy surface is calculated for the interaction of water and carbon dioxide, using second-order Møller-Plesset...

A Survey of Binary Covering Arrays

April 7, 2011

Author(s)

James F. Lawrence, Raghu N. Kacker, Yu Lei, David R. Kuhn, Michael Forbes

Two-valued covering arrays of strength t are 0--1 matrices having the property that for each t columns and each of the possible 2t sequences of t 0's and 1's...

NIST Tools for Quality Assurance in Botanical Dietary Supplement Measurements

April 7, 2011

Author(s)

Melissa M. Phillips

The accurate analysis of botanical dietary supplements presents significant challenges for the analytical laboratory. Analyte stability, extraction efficiency...

From Electrons to Infrastructure: Engineering Concrete From The Bottom Up

April 6, 2011

Author(s)

Hamlin M. Jennings, Jeffrey W. Bullard

We argue that only an approach rooted in fundamental, mechanistic models of concrete materials offers a viable path for handling the enormous number of new...

Validity of the thermal activation model for spin-transfer torque switching in magnetic tunnel junctions

April 6, 2011

Author(s)

Ranko R. Heindl, William H. Rippard, Stephen E. Russek, Matthew R. Pufall, Anthony B. Kos

We have performed spin transfer switching experiments on nanoscale MgO magnetic tunnel junctions, with a large number of trials (up to 107 switching events) as...

Correlation of Variations in Thermoelectric and Microstructural Properties of P-type CeFe4Sb12 Melt-Spun Ribbons Using a Rapid Screening Method

April 6, 2011

Author(s)

Yonggao Y. Yan, Winnie K. Wong-Ng, James A. Kaduk, Gangjian Tan, Wenjie Xie, Martin L. Green, Xinfeng Tang

We have demonstrated the effect of gradients in both phase composition and microstructure of p-type CeFe4Sb12 melt-spun (MS) ribbons on Seebeck coefficient by a...

Magnetic Phase Diagram of Gd₂Sn₂O₇

April 6, 2011

Author(s)

R. S. Freitas, Jason S. Gardner

We have studied the magnetic phase diagram of the Heisenberg pyrochlore antiferromagnet Gd 2Sn 2O 7. Low temperature magnetic susceptibility measurements, as a...

Spin Liquid State in the S = 1/2 Triangular Lattice Ba₃CuSb₂O₉

April 6, 2011

Author(s)

H. D. Zhou, E. S. Choi, G. Li, L. Balicas, C. R. Wiebe, Yiming Qiu, John R. Copley, Jason S. Gardner

Spin liquids remain one of the most important objects of study in modern solid state physics as model systems of quantum magnetism. In this paper, we report the...

Quantum critical behavior in the heavy Fermion single crystal Ce(Ni_0:935Pd_0:065)₂Ge₂

April 6, 2011

Author(s)

C.H. Wang, J .M. Lawrence, A. D. Christianson, Sung Chang, K. Gofryk, E. D. Bauer, F. Ronning, J. D. Thompson, K. J. McClellan, Jose Rodriguez Rivera, Jeffrey W. Lynn

Characterizing arbitrary CW waveforms with 1500 THz/s chirp rates

April 5, 2011

Author(s)

Ian R. Coddington, Fabrizio R. Giorgetta, Esther Baumann, William C. Swann, Nathan R. Newbury

A Dual frequency comb interferometer was constructed to monitor cw laser chirp rates exceeding 1500 THz/s with MHz level resolution and accuracy over a 3 THz...

Path-integral calculation of the third virial coefficient of quantum gases at low temperatures

April 5, 2011

Author(s)

Allan H. Harvey, Giovanni Garberoglio

We derive path-integral expressions for the second and third virial coefficients of monatomic quantum gases. Unlike previous work that considered only Boltzmann...

Research Directions in Security Metrics

April 4, 2011

Author(s)

Wayne Jansen

More than 100 years ago, Lord Kelvin observed that measurement is vital to deep knowledge and understanding in physical science. During the last few decades...

Geographical variation of Persistent Organic Pollutants in eggs of threatened loggerhead sea turtles (Caretta caretta) from Southeastern USA

April 4, 2011

Author(s)

Jennifer M. Lynch, Juan Alava, Jeanette Wyneken, Larry Crowder, Geoffrey Scott, John R. Kucklick

Persistent organic pollutants (POPs) are a recognized man-made threat to sea turtle populations, but the uncertainty surrounding exposure and sensitivity of sea...

Superconformal Ni Electrodeposition using 2-Mercaptobenzimidazole

April 4, 2011

Author(s)

Chang H. Lee, John E. Bonevich, Ugo Bertocci, Kristen L. Steffens, Thomas P. Moffat

Ni superconformal filling of sub-micrometer trenches is demonstrated using a Watts bath containing an inhibitor 2-mercaptobenzimidazole (MBI). Hysteretic...

Formic acid oxidation on Pt_100-x}Pb_x} thin films electrodeposited on Au

April 4, 2011

Author(s)

Sun M. Hwang, John E. Bonevich, Jae Jeong Kim, Thomas P. Moffat

Electrocatalytic formic acid oxidation is examined on electrodeposited Pt_100-x}Pb_x} thin films grown on textured Au(111). Metastable fcc Pb_100-x}Pt_x} (0

Electrodeposition of Pt_(100-x)Pb_(x) Metastable Alloys and Intermetallics

April 4, 2011

Author(s)

Sun M. Hwang, John E. Bonevich, Jae Jeong Kim, Thomas P. Moffat

The electrodeposition of a series of metastable Pt-Pb alloys and intermetallic phases as well as elemental Pt is demonstrated using an acid electrolyte...

Composition-Explicit Distillation Curves of Waste Lubricant Oils and Resourced Crude Oil: A Diagnostic for Re-Refining and Evaluation

April 4, 2011

Author(s)

Lisa S. Ott, Beverly L. Smith, Thomas J. Bruno

We have recently introduced several important improvements in the measurement of distillation curves for complex fluids. The modifications include a composition...

The Policy Machine: a Novel Architecture and Framework for Access Control Policy Specification and Enforcement

April 1, 2011

Author(s)

David F. Ferraiolo, Vijay (. Atluri, Serban I. Gavrila

The ability to control access to sensitive data in accordance with policy is perhaps the most fundamental security requirement. Despite over four decades of...

A Major Role for Non-Enzymatic Antioxidant Processes in the Radioresistance of Halobacterium salinarum

April 1, 2011

Author(s)

M Miral Dizdar, Pawel Jaruga, Courtney K. Robinson, Kim Webb, Amardeep Kaur, Nitin S. Baliga, Allen Place, Jocelyne DiRuggiero

Oxidative stress occurs when the generation of reactive oxygen species (ROS) exceeds the capacity of the cells endogenous systems to neutralize them. We...

NEMA and ASHRAE Collaborate to Develop a Facility Smart Grid Information Mode Standard

April 1, 2011

Author(s)

Steven T. Bushby

The National Electrical Manufacturers Association (NEMA) and the American Society of Heating Refrigerating, and Air-Conditioning Engineers (ASHRAE) are working...

After the Alarm Sounds: How We Got Here, Where We Are, and Where We Should Go

April 1, 2011

Author(s)

Jason D. Averill, Erica D. Kuligowski, Richard D. Peacock

This article reviews the history of egress design and code requirements in the United States, describes the current state-of-the-art in egress design and...

Searching for applications with a fine-toothed comb

April 1, 2011

Author(s)

Nathan R. Newbury

Frequency combs, like many ground-breaking technologies, are simple in concept; they results from the spectrum of any regular train of optical pulses. What is...

Wolter Optics for Neutron Focusing

April 1, 2011

Author(s)

David F. Mildner, M. V. Gubarev

Focusing optics based on Wolter optical geometries developed for x-ray grazing incidence beams can be designed for neutron beams. Wolter optics are formed by...

An Engineer Grapples with Sustainable Manufacturing

April 1, 2011

Author(s)

Vijay Srinivasan

A personal view by the author of how, as a research engineer and manager, first in the private sector and now in government service, he witnessed the emergence...

RFID-based Localization and Tracking Technologies

April 1, 2011

Author(s)

Michael R. Souryal, Lionel M. Ni, Dian Zhang

Radio Frequency Identification (RFID) usually incorporates a tag into an object for the purpose of identification or localization using radio signals. It has...

Onset of Morphological Instability in Two Binary Liquid Layers

April 1, 2011

Author(s)

Geoffrey B. McFadden, Sam R. Coriell, Aaron Lott

We consider the linear stability of a horizontal fluid bilayer subject to vertical heating. The two layers consist of a binary fluid that has undergone a phase...

Addressing the Amorphous Content Issue in Quantitative Phase Analysis: The Certification of NIST SRM 676a

April 1, 2011

Author(s)

James P. Cline, Robert B. Von Dreele, Ryan Winburn, Peter W. Stephens, James J. Filliben

A non-diffracting surface layer exists at any boundary of a crystal and can comprise a mass fraction of several percent in a finely divided solid. This has led...

Was this page helpful?