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.
Wildland-Urban Interface (WUI) fires have devastated communities on multiple continents. Large outdoor fires in Japan mainly occur due to post-earthquake fires
The field of intrusion detection is divided into signature detection and anomaly detection. The former involves identifying patterns associated with known
The fire blocking performance of barrier fabrics laminated to upholstery materials was investigated. The results are two-fold. The first involves information
We revisit the problem of Full Disk Encryption (FDE), which refers to the encryption of each sector of a disk volume. In the context of FDE, it is assumed that
Victor S. Zhang, Zhiheng Jiang, Thomas E. Parker, Jian Yao, Yi-Jiun Huang, Shinn-Yan Lin
The conventional wisdom suggests a direct Two-Way Satellite Time and Frequency Transfer (TWSTFT or TW) time link should result in a smaller uncertainty than
We report on a preliminary design of a new Kalman-filter Hydrogen-maser time scale at NIST. The time scale is composed of a few Hydrogen masers and a Cs clock
Victor S. Zhang, Demetrios Matsakis, Zhiheng Jiang
Calibration and link stability are the key issues for the UTC time transfer. This study is made in the framework of a joint task group of the CCTF Working Group
Joshua J. Savory, Liz C. Forero, Kristopher Maurer, Stefania Romisch
The National Institute of Standards and Technology (NIST) timescale produces a real-time realization of UTC(NIST) in the form of a pulse-per-second (PPS) time
The current real-time timescale at NIST, AT1, as well as the post-processed scale TP162, both contain hydrogen masers and commercial cesium frequency standards
Network Time Protocol (NTP) servers maintained by national timing laboratories are ideally synchronized to a one pulse-per-second (pps) signal from the official
Jian Yao, Michael A. Lombardi, Andrew N. Novick, Bijunath Patla, Jeffrey A. Sherman, Victor S. Zhang
Errors in the Coordinated Universal Time (UTC) offset parameters broadcast by Global Positioning System (GPS) satellites caused many thousands of GPS clocks to
Victor S. Zhang, Thomas E. Parker, Joseph Achkar, Dirk Piester, Yi-Jiun Huang, Shinn-Yan Lin, Zhiheng Jiang
The BIPM and the CCTF Working Group on TWSTFT have stimulated a pilot study on using software defined radio (SDR) receivers for TWSTFT in the framework of the
David R. Leibrandt, Samuel M. Brewer, Jwo-Sy Chen, Aaron M. Hankin, David B. Hume, David J. Wineland, Chin-Wen Chou
Frequency and its inverse, time, are the most accurately measured quantities. Historically, improvements in the accuracy of clocks have enabled advances in
The Public Safety Communications Research Program (PSCR) convened over 80 stakeholders at the National Institute of Standards and Technology (NIST) Boulder, CO
Marc A. Weiss, Alison Silverstein, Francis Tuffner, Ya-Shian Li-Baboud
Today, the principal way that power system owners and operators use precision timing is for fault recording, protection system operation and in synchrophasor
Vincent Y. Kotsubo, Ray Radebaugh, Sae Woo Nam, Joel N. Ullom, Brandon L. Wilson, Paul Hendershott, Micheal Bonczyski
We are developing a compact, low power, closed cycle cooling system for Superconducting Nanowire Single Photon Detectors. The base temperature of the present
This paper presents optical measurements of the dynamic strain profiles along the tethers of microelectromechanical resonators and relates them to quality
Lior Medina, Rivka Gilat, B. Robert Ilic, Slava Krylov
We demonstrate an open-loop self-excitation response in a curved, bistable microelectromechanical beam under a time-independent electrostatic load. The self
This paper reports on quantification and management of inherent systemic risk/performance tradeoff in the cloud computing model. We view Cloud as a Complex
Chris Rojahn, Laurie Johnson, Thomas O'Rourke, Veronica Cedillos, Therese P. McAllister
The concept of community resilience is a complex, multi-dimensional problem that relies on social science, engineering, earth sciences, economics, and other
Performance-based standards use plastic rotation as an important measure to determine whether the response meets the acceptance criteria for moment-resisting
Structural engineers in the United States have turned to performance-based design methodologies for design of new buildings in order to find improved design
Samantha Gamboa Quintiliani, Fernando Cintron, David W. Griffith, Richard A. Rouil
Long Term Evolution Advanced (LTE-A) introduces a new feature called Proximity Services (ProSe), which enables device-to-device (D2D) communication between User
Raul Uribe, Siamak Sattar, Matthew Speicher, Luis Ibarra
This paper quantifies the impact of using different ground motion selection methods to evaluate the seismic performance of steel special moment frames. Two
An analytical method is developed to investigate the potential energy of fully nonlinear framed structures and other energy characteristics due to earthquake
Azza Ben Mosbah, Timothy Hall, Michael R. Souryal, Hossam Afifi
Sharing between commercial and Federal incumbent users, such as in the 3.5 GHz band, is expected to increase the availability of spectrum for wireless broadband
With the congestion and scarcity of available spectrum resources, spectrum sharing between long-term evolution (LTE) and the IEEE 802.11 (aka. WLAN) systems is
We investigate the role of the electric field and its normal derivative in three-dimensional electromagnetic scattering theory. In particular, we present an