U.S. flag

An official website of the United States government

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.

Search Publications

NIST Authors in Bold

Displaying 18576 - 18600 of 74079

Measuring the Neutron Lifetime Using Magnetically Trapped Neutrons

May 1, 2014
Author(s)
Hans P. Mumm, Alan Keith Thompson, Paul R. Huffman, Christopher O'Shaughnessy, Kevin J. Coakley, Robert Golub, John M. Doyle, Steve K. Lamoreaux, P.-N. Seo, C E. Mattoni, S N. Dzhosyuk, L Yang, Grace L. Yang, Karl W. Schelhammer, Christopher M. Swank
The neutron beta-decay lifetime plays an important role, both in understanding weak interactions within the framework of the Standard Model, and in theoretical predictions of the primordial abundance of 4He in Big Bang Nucleosynthesis. In previous work, we

Multiheterodyne spectroscopy with optical frequency combs generated from a continuous-wave laser

May 1, 2014
Author(s)
David A. Long, Adam J. Fleisher, Kevin O. Douglass, Stephen E. Maxwell, Katarzyna E. Bielska, Joseph T. Hodges, David F. Plusquellic
Dual-drive Mach-Zehnder modulators were utilized to produce power-leveled optical frequency combs (OFCs) from a continuous-wave laser. The resulting OFCs contained up to fifty unique frequency components and spanned more than 200 GHz. Simple changes to the

Topological physics with light

May 1, 2014
Author(s)
Jacob M. Taylor, Mohammad Hafezi
Electrons in a so-called topological insulator circulate around the material’s boundary without ever straying into the bulk. Uncharged photons can be induced to carry out similar behavior.

Trends in QconCATs for targeted proteomics

May 1, 2014
Author(s)
Junjun J. Chen, Illarion Turko
Targeted proteomics has received much attention because of the highly-sensitive, quantitative detection of proteins and post-translational modifications (PTMs). Quantification by targeted proteomics relies on mass spectrometry and isotope-labeled internal

WWVB Time Signal Broadcast: A New Enhanced Broadcast Format and Multi-Mode Receiver

May 1, 2014
Author(s)
John P. Lowe, Yingsi Liang, Oren Eliezer, Dinesh Rajan
WWVB is a broadcast station, operated by the National Institute of Standards and Technology, that has been broadcasting time information to radio-controlled clocks (RCC) throughout the continental US since 1965. The transmitted information includes the

Accurate RRAM Transient Currents during Forming

April 30, 2014
Author(s)
Pragya R. Shrestha, David M. Nminibapiel, Jason P. Campbell, Jihong Kim, Canute I. Vaz, Kin P. Cheung, Helmut Baumgart
Current overshoot during forming has been shown to be a serious issue. Recently the current overshoot duration has been shown to be an important factor impacting device performance. Short duration overshoot in the range of ns yield better performance. But

Development of Fiber Fabrey-Perot Interferometers as stable near-infrared calibration sources for high resolution spectrographs

April 30, 2014
Author(s)
Samuel Halverson, Suvrath Mahadevan, Lawrence W. Ramsey, Fred Hearty, John C. Wilson , Jon Holtzman, Stephen L. Redman, Gillian Nave, David Nidever, Matthew Nelson, Nick Venditti, Dmitry Bizyaev , Scott Fleming
We discuss the ongoing development of single-mode ber Fabry-Perot(FFP)Interferometers as precise astrophotonic calibration sources for high precision radial velocity (RV) spectrographs. The devices are simple, inexpensive, monolithic units that can yield a

Measurement of Nanomaterials in Foods: Integrative Consideration of Challenges and Future Prospects

April 30, 2014
Author(s)
Christopher W. Szakal, Steve Roberts, Paul Westerhoff, Andrew Bartholomaeus, Neil Buck, Ian Illuminato, Richard Canady, Michael Rogers
Risks and benefits of nanomaterials related to food receive conflicting attention in news media, research, and across expert stakeholder groups internationally. Current nanomaterial analysis is complicated by broad definitions that include traditional food

Materials Genome III: CALPHAD Data Repositories and Beyond

April 29, 2014
Author(s)
Carelyn E. Campbell, Ursula R. Kattner, Zi-Kui Liu
Initially, the CALPHAD method was established as a tool for treating thermodynamics and phase equilibria of multicomponent systems. Since then the method has been successfully applied to diffusion mobilities in multicomponent systems, creating the

Tearing and scrolling of transferred graphene

April 29, 2014
Author(s)
Guangjun Cheng, Brent A. Sperling, James E. Maslar, Curt A. Richter, Angela R. Hight Walker
We present an investigation on tearing and scrolling of the transferred graphene on a Si/SiO2 substrate. Graphene grown by chemical vapor deposition (CVD) is transferred onto a Si/SiO2 substrate using a wet polymer-mediated process. Upon the removal of

An improved method of modeling infiltration in commercial building energy models

April 28, 2014
Author(s)
Lisa C. Ng, Steven J. Emmerich, Andrew K. Persily
As various strategies for improving building envelope and HVAC equipment efficiencies are increasingly used to reduce building energy use, a greater percentage of energy loss can occur through building envelope leakage. Although the energy impacts of
Displaying 18576 - 18600 of 74079