An official website of the United States government
Here’s how you know
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.
Francisco E. Becerra Chavez, Jingyun Fan, Gerald Baumgartner, Julius Goldhar, Jonathan Kosloski, Alan L. Migdall
The measurement of the state of a quantum system with inherent quantum uncertainty (noise) approaching the ultimate physical limits is of both technological and...
Sara V. Orski, Santanu Kundu, Richard Gross, Kathryn L. Beers
A two-dimensional model of a solid-supported enzyme catalyst bead is fabricated on a quartz crystal microbalance sensor to measure in situ stability and...
Michele M. Schantz, Manuela Ulberth-Buchgraber, Monica Potalivo, Andrea Held, Annaratia Baldan, Adriaan van der Veen, Hugo Ent, Valnei Cunha, Romeu Daroda, Ruth Hearn, Richard Brown, Paul Brewer, Brian E. Lang
The results of an interlaboratory comparison, using various measurement methods to carry out biodiesel testing, are presented, and the findings discussed. The...
We describe the development of free-field test methods for wireless electronic safety equipment that replicate field-test conditions in a laboratory environment...
Meiyao M. Wang, Hua-Jun He, Illarion Turko, Karen W. Phinney, Lili Wang
CD4 is an important glycoprotein containing a transmembrane portion and a short intracellular tail. It locates on the surface of various types of immune cells...
This paper reports spectroscopy and imaging of spin wave modes using ferromagnetic resonance force microscopy (FMRFM) in Permalloy nano-disks with disk...
It is likely that expression and/or post-translational generation of various protein isoforms can be indicative of initial pathological changes or clarifying of...
Qin Zhang, Rui Li, Rusen Yan, Thomas Kosel, Grace Xing, Alan Seabaugh, Kun Xu, Oleg A. Kirillov, David J. Gundlach, Curt A. Richter, Nhan V. Nguyen
We report a unique way to measure the energy band offset of a heterojunction by exploiting the light absorption profile in the heterojunction under visible...
Kan K. Du, Seung-Hyeon Ko, Gregg M. Gallatin, Heayoung Yoon, James Alexander Liddle, Andrew J. Berglund
The binding process of quantum dots and DNA origami was monitored using a 3D, real-time, single-particle tracking system. Single-molecule binding events were...
John Butler, Manuel Fondevila, Carla Santos, Ana Freire, Christopher Phillips, M Lareu, Peter Vallone, Á. Carracedo
A revision of an established 34 SNP forensic ancestry test has been made by swapping the under- performing rs727811 component SNP with the highly informative...
The spectrum of singly-ionized iron (Fe II) has been recorded using high-resolution Fourier transform and grating spectroscopy over the wavelength range 900 Å...
Andrew J. Allen, Fan Zhang, Lyle E. Levine, Gabrielle G. Long, Jan Ilavsky, Pete R. Jemian
The history and development over more than 25 years is presented and discussed of an ultra-small-angle X-ray scattering (USAXS) instrument dedicated to serving...
Quantitative leak tests with vacuum technology have become an important tool in industry for safety and operational reasons and to meet environmental...
Richard W. Hendler, Curtis W. Meuse, Paul Smith, John W. Kakareka
We recently published procedures describing the isolation of absolute infrared spectra for the intermediates of the bacteriorhodopsin (BR) photocycle and from...
Asha K. Nurse, Geoffrey B. McFadden, Sam R. Coriell
An analysis of the motion of a spherical bubble in a two-phase, single component system with a vertical linear temperature gradient is presented. The model for...
During 2012, the main emphasis of the Metrology Technical Working Group was to revise the Metrology Technology Requirements Tables and initiate the new text for...
The paper discusses the current status of biometric standards development activities, with a focus on international standards developments. Published standards...
Concrete can develop tensile stress when it is restrained from shrinking freely. Standard tests, like the restrained ring test (ASTM C1581-09) can be used to...
Emil Simiu, Chris Letchford, Nicholas Isyumov, Arindam Chowdhury, DongHun Yeo
The purpose of this work is to present an assessment of methods for determining wind loads on buildings and other structures that warrant comment, correction or...
Endogenous and exogenous sources cause oxidatively induced DNA damage in living organisms by a variety of mechanisms. Resulting DNA lesions are mutagenic and...
Dazhen Gu, James P. Randa, Robert L. Billinger, Dave K. Walker
We report a verification method for noise-temperature (NT) measurements on cryogenic low-noise amplifiers (LNAs) at liquid helium temperature. The method uses a...
Winnie K. Wong-Ng, James A. Kaduk, Hui Wu, Matthew Suchomel
M2(dhtp)nH2O, (M= Mn, Co, Ni, Zn; dhtp= 2,5-dihydroxyterephthalate), known as MOF74, is a family of excellent sorbent materials for CO2 that contains of...
Pascal P. Del'Haye, Scott B. Papp, Scott A. Diddams
Optical frequency combs based on mode-locked lasers have proven to be invaluable tools for a wide range of applications in precision spectroscopy and metrology...
Edwin P. Chan, Allison P. Young, Jung-Hyun Lee, Jun-Young Chung, Christopher M. Stafford
We study the water swelling behavior of semi-aromatic crosslinked polyamide ultrathin films in order to characterize the materials properties of the polymer...
Jessica L. Staymates, Mark M. Bailey, Steven R. Kline, Michael D. Anderson, Cory Berkland
Recently there has been interest in developing imaging contrast media for magnetic resonance imaging (MRI) that contain biologically rare, magnetically active...
Winnie K. Wong-Ng, William J. Laws, Yonggao Y. Yan
The phase diagram of the La-Ca-Co-O system at 885 °C in air has been determined. The system consists of two materials that have interesting thermoelectric...
Carolyn R. Steffen, Margaret C. Kline, John Butler, Robert S. McLaren, Jaynish Patel, Margaret Ewing, Douglas R. Storts, Fabrice Noel, Sophie Dognaux
The SE33 locus is one of the most polymorphic markers used in human identification. However, it also possesses multiple microvariants both within the repeat and...
Jacob M. Taylor, Yigit Subasi, Chris Fleming, Bei L. Hu
In this work we investigate the late-time stationary states of open quantum systems coupled to a thermal reservoir in the strong coupling regime. This is...
James V. Porto, Hoi-Yin Hui, Ryan Barnett, Sankar Das Sarma
In this work, we consider excited many-body mean-field states of bosons in a double-well optical lattice by investigating stationary Bloch solutions to the non...