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Journals

Hierarchical Nanomorphologies Promote Exciton Dissociation in Polymer/Fullerene Bulk Heterojunction Solar Cells

August 8, 2011

Author(s)

Wei Chen, Tao Xu, Feng He, Wei Wang, Cheng Wang, Joseph Strzalka, Yun Liu, Jianguo Wen, Dean J. Miller, Jihua Chen, Kunlun Hong, Luping Yu, Seth B. Darling

PTB7 semiconducting copolymer comprising thieno[3,4-b]thiophene and benzodithiophene alternating repeat units set a historic record of solar energy conversion...

Comparison of a detector-based near-IR radiance-scale to an ITS-90 calibrated radiation thermometer

August 7, 2011

Author(s)

George P. Eppeldauer, Howard W. Yoon, Jinan Zeng, Thomas C. Larason

Integrating-sphere-input InGaAs radiometers have been developed at the National Institute of Standards and Technology (NIST) to extend the detector-based...

Detection of Dynamical Transitions in Hydrogenous Materials using Transmission Measurements with Very Cold Neutrons

August 6, 2011

Author(s)

Kristina Verdal, Terrence J. Udovic, John R. Copley, John J. Rush

We have tested the transmission of very cold neutrons as a method to measure dynamical transitions in hydrogenous materials. Transmitted intensities vs...

Thermococcus kodakarensis has two functional PCNA homologues but only one is essential for viability

August 5, 2011

Author(s)

Zvi Kelman

Proliferating cell nuclear antigen (PCNA) monomers assemble to form a ring-shaped clamp complex that encircles duplex DNA. PCNA binding to other proteins...

Charge state dependent energy deposition by ion impacts

August 5, 2011

Author(s)

Russell E. Lake, Joshua M. Pomeroy, Holger Grube, C E. Sosolik

We report on a measurement of craters in thin dielectric films formed by XeQ+ (26 Q 44) projectiles. Tunnel junction devices with ion-irradiated barriers were...

A new approach to prepare well-dispersed CaF2 nanoparticles by spray drying technique

August 5, 2011

Author(s)

Limin Sun, Laurence C. Chow, John E. Bonevich, James W. Mitchell

Previously, a nano-sized calcium fluoride (CaF2) was prepared using a spray drying method by simultaneously feeding Ca(OH)2 and NH4F solutions to a two-liquid...

Magnetic-Crystallographic Phase Diagram of the Superconducting Parent Compound Fe_1+xTe

August 5, 2011

Author(s)

Efrain E. Rodriguez, Christopher K. Stock, P. Zajdel, Kathryn L. Krycka, Charles Majkrzak, P. Zavalij, Mark Green

Through neutron diffraction experiments, including spin-polarized measurements, we construct a magnetic-crystallographic phase diagram of the superconducting...

Giant Effect of Uniaxial Pressure on Magnetic Domain Populations in Multiferroic Bismuth Ferrite

August 5, 2011

Author(s)

M. Ramazanoglu, William D. Ratcliff, H. T. Yi, A. A. Sirenko, S.- W. Cheong, V. Kiryukhin

Neutron diffraction is used to show that small (7 MPa, or 70 bar) uniaxial pressure produces significant changes in the populations of magnetic domains in a...

A Technique for measuring radial error motions of ultra-high-speed miniature spindles used for micromachining

August 5, 2011

Author(s)

Prashanth Anandan, Abhinandan Tulsian, Alkan Donmez, Burak Ozdoganlar

Ultra-high-speed (UHS) miniature spindles are widely used for mechanical micromachining processes, such as micromilling and microdrilling, as well as for...

The Infrared Spectrum of Uranium Hollow Cathode Lamps from 850 - 4000 nm: Wavenumbers & Line Identifications from FTS Spectra

August 4, 2011

Author(s)

Stephen L. Redman, James E. Lawler, Gillian Nave, Lawrence W. Ramsey, Suvrath Mahadevan

We provide new measurements of wavenumbers and line identifications of 10100 UI and UII near-infrared (NIR) emission lines between 2500 cm−1 and 12000 cm−1...

Electron-exchange assisted photon energy up-conversion in thin films of ¿-conjugated polymeric composites

August 4, 2011

Author(s)

Panagiotis Keivanidis, Frederic Laquai, Joseph W. Robertson, Baluschev Stanislav, Josemon Jacob, Klaus Mullen, Gerhard Wegner

The mechanism of triplet-triplet annihilation (TTA) induced up-converted delayed luminescence is studied in two different binary organic systems consisting of...

The 3-D Shape of Blasted and Crushed Rocks: From 20 ¿m to 38 mm

August 3, 2011

Author(s)

Edward J. Garboczi, Michael Taylor, Xuefeng Liu

Granodiorite material from a rock quarry in California was prepared by first quarrying large boulders, and then crushing down to smaller sizes. A range of...

Hierarchical Structure and Dynamics of an Ionic Liquid 1-Octyl-3-methylimidazolium Chloride

August 3, 2011

Author(s)

Osamu Yamamuro, Takeshi Yamada, Maiko Kofu, Masamichi Nakakoshi, Michihiro Nagao

We have performed the heat capacity, neutron diffraction, and neutron quasielas- tic scattering measurements of an ionic liquid 1-octyl-3-methylimidazolium...

Measuring silver nanoparticle dissolution in complex biological and environmental matrices using UV-Visible absorbance

August 2, 2011

Author(s)

Justin M. Zook, Stephen E. Long, Danielle Cleveland, Carly L. Geronimo, Robert I. MacCuspie

Distinguishing the toxic effects of nanoparticles (NPs) themselves from the well-studied toxic effects of their ions is a critical but challenging measurement...

Thermodynamic properties of adamantane revisited

August 2, 2011

Author(s)

Vladimir Diky, Ala B. Bazyleva, Andrey V. Blokhin, Gennady J. Kabo, Mikhail B. Charapennikau, Vladimir N. Emel'yanenko, Sergey P. Verevkin

The heat capacity and parameters of the solid-to-solid phase transition of adamantane were measured in the temperature range (80 to 370) K using adiabatic...

Light-Controlled Protein Dynamics Observed with Neutron Spin Echo Measurements

August 2, 2011

Author(s)

Shao-Chun Wang, Panteha Mirarefi, Antonio Faraone, Jr. Lee

A photo-responsive surfactant has been used as a means to control protein structure and dynamics with light illumination. This cationic azobenzene surfactant...

Molecular Spin Excitations in the Orbitally Frustrated Spinel GeCo_2Od4^

August 2, 2011

Author(s)

K. Tomiyasu, Michael K. Crawford, D.T. Adroja, P. Manuel, A. Tominaga, S. Hara, H. Sato, T. Watanabe, S. I. Ikeda, Jeffrey W. Lynn, K. Iwasa, K Yamada

We describe powder and single-crystal inelastic neutron scattering experiments on a spinel-type antiferromagnet GeCo 2O 4 with orbital degrees of freedom, which...

Emergency Radiobioassay Preparedness Exercises through the NIST Radiochemistry Intercomparison Program (NRIP)

August 1, 2011

Author(s)

Svetlana Nour, Jerome LaRosa, Kenneth G. Inn

The present challenge for the international radiobioassay community is to analyze contaminated samples rapidly while maintaining high quality results. NIST runs...

Key comparison BIPM.RI(I)-K7 of the air-kerma standards of the NIST, USA and the BIPM in mammography x-rays.

August 1, 2011

Author(s)

C M. O'Brien, C. Kessler, D T. Burns

A first key comparison has been made between the air-kerma standards of the NIST and the BIPM in mammography x ray beams. The results show the standards to be...

Cell Adhesion to Borate Glasses by Colloidal Probe Microscopy

August 1, 2011

Author(s)

Sheldon M. Wiederhorn, Carl G. Simon Jr., Young-Hun Chae

The adhesion of Osteoblast-like cells to silicate and borate glasses was measured using colloidal probe microscopy in a cell growth medium. The probe consisted...

Trapping and Release of Citrate-Capped Gold Nanoparticles

August 1, 2011

Author(s)

Darwin R. Reyes-Hernandez, Geraldine I. Mijares, Brian J. Nablo, Kimberly A. Briggman, Michael Gaitan

An electrical method to trap and release charged gold nanoparticles on and from the surface of alkanethiol self-assembled-monolayer (SAM) modified gold...

A Simple Series Resistance Extraction Methodology for Advanced CMOS Devices

August 1, 2011

Author(s)

Jason P. Campbell, Kin P. Cheung, John S. Suehle, A Oates

Series resistance has become a serious obstacle inhibiting the performance of advanced CMOS devices. However, series resistance quantification in these same...

GaN Nanowires Grown by Molecular Beam Epitaxy

August 1, 2011

Author(s)

Kristine A. Bertness, Norman A. Sanford, Albert Davydov

The unique properties of GaN nanowires grown by molecular beam epitaxy are reviewed. These properties include the absence of residual strain, exclusion of most...

Effect of Alternating Ar and SF6/C4F8 Gas Flow in Si Nano-Structure Plasma Etching

August 1, 2011

Author(s)

Lei Chen, Vincent K. Luciani, Houxun H. Miao

Si is very reactive to normal plasma etchants such as fluorine based chemicals and the reactions are inherently isotropic. To fabricate small and/or high aspect...

Plasma Etching Uniformity Control for Making Large and Thick Dual-Focus Zone Plates

August 1, 2011

Author(s)

Lei Chen, Quandou (. Wang, Ulf Griesmann

A typical zone plate structure is composed of concentric rings with a radially decreasing feature size such that the path of light through every second zone to...

On the Relationship Between Deformation-Induced Surface Roughness and Plastic Strain in AA5052 Is it Really Linear?

August 1, 2011

Author(s)

Mark R. Stoudt, Joseph B. Hubbard, Stefan D. Leigh

Three different heat treatments of aluminum alloy AA5052 were subjected to various levels of uniaxial plastic strain. The resulting surface topographies were...

Optimization of Cement and Fly Ash Particles to Produce Sustainable Concretes

August 1, 2011

Author(s)

Dale P. Bentz, Andrew Hansen, John Guynn

In the drive to produce more sustainable concretes, considerable emphasis has been placed on replacing cement in concrete mixtures with more sustainable...

First in a Series on the Evolution of Time Measurement: Celestial, Flow, and Mechanical Clocks

August 1, 2011

Author(s)

Michael A. Lombardi

A historical article about early clocks and time measurements (Part I of a IV-part series). It describes a number of different types of early clocks including...

A Special Functions Handbook for the Digital Age

August 1, 2011

Author(s)

Ronald F. Boisvert, Charles W. Clark, Daniel W. Lozier, Frank W. Olver

The NIST Digital Library of Mathematical Functions (DLMF) is a reference work providing information on the properties of the special functions of applied...

Development of a Seebeck Coefficient Standard Reference Material (SRM)

August 1, 2011

Author(s)

Nathan Lowhorn, Winnie Wong-Ng, John Lu, Joshua B. Martin, Martin L. Green, John E. Bonevich, Evan L. Thomas, Neil Dilley, Jeff Sharp

We have successfully developed a Seebeck coefficient Standard Reference Material (SRM), Bi2Te3, that is essential for interlaboratory data comparison and for...

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