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 3626 - 3650 of 74068

Solidus Phase Relationships in the AO-Al 2 O 3 -Nb 2 O 5 (A = Ca, Sr) Systems

October 12, 2021
Author(s)
Julia Y. Chan, Wilma Feb-Ayala, L D. Rotter, Igor Levin, Richard G. Geyer
Dielectric ceramics for wireless communications exhibiting modest permittivity, high quality factor (Q), and near-zero temperature coefficient are needed for high frequency, high power applications. Efforts are in progress to replace Ta 2O 5-based ceramics

Soluble Amyloid [Beta] Oligomers Affect Dielectric Properties by Membrane Incorporation and Domain Formation: Implications for Cell Toxicity

October 12, 2021
Author(s)
G Valinius, K F. Heinrich, R Budvytye, David J. Vanderah, Y Sokolov, J Hall, M Losche
Water-soluble prefibrillar amyloid b (Ab1 42) oligomers affect model bilayers by greatly reducing the membrane barrier to ion transport, as previously reported for Ab in many papers. However, important signatures of the molecular transport mechanism are

Some Properties of Irregular 3-D Particles

October 12, 2021
Author(s)
Michael A. Taylor, Edward Garboczi, S T. Erdogan, D Fowler
This paper discusses some of the properties of irregular particles that are of interest to engineers, including volume, density, & surface area. Numerical and statistical information on these properties is essential (a) for a better understanding of

Some Statistical Methods Applicable to Key Comparisons Studies

October 12, 2021
Author(s)
Hariharan K. Iyer, Chih-Ming Wang, Dominic F. Vecchia
Results of International Key Comparisons of National Measurement Standards provide the technical basis for the Mutual Recognition Arrangement formulated by Le Comite International des Poids et Mesures. With many key comparisons already completed and a

Space Charge Characterization for the 21st Century

October 12, 2021
Author(s)
G Damamme, C LeGressus, A S. DeReggi
The various methods of characterizing insulating materials by their ability to take up charge, retain it, and release it are reviewed critically in search of measurable quantities that could be used to predict material behavior under stress up to failure

Species Formation and Burning Characteristics of Scaled Propane Compartment Fires

October 12, 2021
Author(s)
C J. Wieczorek, U Vandsburger, J E. Floyd
Fires occurring in dense occupancies such as hospitals, dormitories, and nursing homes pose a serious threat to occupants due to the risk of carbon monoxide poisoning. This risk is becoming increasingly important as the population demographics of developed

Specific DNA Binding to CRP Induces Conformational Changes in the CRP and the DNA in Solution: A Small-Angle Neutron Scattering Study

October 12, 2021
Author(s)
Susan T. Krueger, S. K. Gregurick, Y. Shi, S. Wang, B Waldkowski, Frederick P. Schwarz
The transcription activator, 3'-5' cyclic adenosine monophosphate (cAMP) receptor protein (CRP), when ligated with cAMP, activates the transcription of over 25 operons, which code for enzymes involved in carbohydrate metabolism in E. coli. Small-angle

Spectral Data for Gallium: Ga I through Ga XXXI

October 12, 2021
Author(s)
T Shirai, Joseph Reader, Alexander Kramida, J Sugar
The energy levels and spectral lines of gallium atom in all stages of ionization have been compiled. Experimental data on spectral lines and energy levels exist for spectra Ga I through Ga VII, Ga XXIII through Ga XXVI, and Ga XXX. For Li-like Ga XXIX

Spectrum and Energy Levels of the Nd 4+ Free Ion (Nd V)

October 12, 2021
Author(s)
Ali Meftah, J-F Wyart, Jocelyne Sinzelle, Wan-U Lydia Tchang-Brillet, Norbert Champion, Nissan Spector, J Sugar
The spectrum of neodymium excited by a sliding spark source was photographed on two vacuum ultraviolet normal-incidence spectrographs. About 250 lines attributed to Nd V, hitherto unknown, have been identified. The analysis of this spectrum established all

Stability of Global Entanglement in Thermal States of Spin Chains

October 12, 2021
Author(s)
G K. Brennen, Stephen Bullock
We investigate the entanglement properties of a one dimensional chain of spin qubits coupled via nearest neighbor interactions. The entanglement measure used is the $n$-concurrence, which is distinct from other measures on spin chains such as bipartite

Stability of Precision Diamond Turning Processes That Use Round Nosed Tools

October 12, 2021
Author(s)
David E. Gilsinn, Matthew A. Davies, B Balachandran
A system of retarded differential equations model is developed for a diamond-turning process with chip area cut by a round nosed tool. The results are presented in the form of stability charts that are found to be perturbed forms of those obtained for

Stable and Robust Polymer Nanotubes Stretched From Polymersomes

October 12, 2021
Author(s)
Joseph E. Reiner, J M. Wells, Rani B. Kishore, Candace Pfefferkorn, Kristian Helmerson
We create long polymer nanotubes by directly pulling on the membrane of polymersomes using either optical tweezers or a micropipette. The polymersomes are composed of amphiphilic diblock copolymers and the nanotubes formed have an aqueous core. We

Standard Reference Photometer for the Assay of Ozone in Calibration Atmospheres

October 12, 2021
Author(s)
R J. Paur, A M. Bass, James E. Norris, T J. Buckley
A photometric instrument for the assay of ozone from 0 ppbv to 1000 ppbv in calibration atmospheres as been designed, constructed, and evaluated. The absorption cross-section of ozone at 254 nm (HG line) is the major component of uncertainty of the

Stoichiometry and Phase Composition of MOCVD Barium Titanate Films

October 12, 2021
Author(s)
Charles E. Bouldin, Joseph Woicik, Bruce Ravel, Debra Kaiser, Mark D. Vaudin
X-ray absorption fine structure (XAFS), x-ray diffraction (XRD) and x-ray fluorescence (XRF) have been used to study the stoichiometry and phase composition of thin (approximately equal to} 1 micron) films deposited on MgO substrates. Deposition

Strain and Spin-Orbit Effects in Self-Assembled Quantum Dots

October 12, 2021
Author(s)
M Zielinski, W Jaskolski, Javier Aizpurua, Garnett W. Bryant
The effects of strain and spin-orbit interaction in self-assembled lens-shaped InAs/GaAs quantum dots are investigated. Calculations are performed with empirical tight-binding theory supplemented by the valence force field method to account for effects of

Strength Evaluation on a Composite Marine Propeller Blade

October 12, 2021
Author(s)
H J. Lin, J J. Lin, Tze-Jer Chuang
The strength of a composite propeller blade is evaluated by performing a nonlinear hydro-elastic analysis. The finite element method, lifting surface theory, least square method, equilibrium equation and Hashin failure criteria are employed for the

Structural Alterations in the DNA of Stroma and Epithelium From the Female Breast

October 12, 2021
Author(s)
Donald C. Malins, Katie M. Anderson, Pawel Jaruga, Callie R. Ramsey, Naomi K. Gilman, Virginia M. Green, Steven W. Rostad, Joanne T. Emerman, M. Dizdaroglu
Reciprocal interactions between the stroma and epithelium are considered to be intimately associated with the development of breast cancer. In studies of whole breast tissues, a keen interest exists in the occurrence of the mutagenic DNA lesions 8-hydroxy
Displaying 3626 - 3650 of 74068