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Displaying 3076 - 3100 of 3362

Elemental and Molecular Imaging of Human Hair Using Secondary Ion Mass Spectrometry

April 1, 1999
Author(s)
John G. Gillen, S V. Roberson, C M. Ng, M Stranick
Secondary ion mass spectrometry (SIMS) is used to image the spatial distribution of elemental and molecular species on the surface and in cross-sections of doped human hair using a magnetic sector SIMS instrument operated as an ion microprobe. Analysis of

A Free-Fall Determination of the Newtonian Constant of Gravity

December 1, 1998
Author(s)
J P. Schwarz, D S. Robertson, T M. Niebauer, J E. Faller
We report on a recent determination of the Newtonian constant of gravity, G, using a new free fall method. This method uses a freely falling test object to sense the gravitational field of a ring-shaped mass placed alternately above and below the drop

Design of an Atomic Force Microscope with Interferometric Position Control

August 19, 1994
Author(s)
J Schneir, T Mcwaid, J Alexander, B Wilfley
Advances in the manufacture of integrated circuits, x?ray optics, magnetic read-write heads, optical data storage media, and razor blades require advances in ultraprecision metrology. Each of these industries is currently investigating the use of atomic

Multi'omic Characterization of Human Whole Stool RGTMs

September 8, 2023
Author(s)
Amanda Bayless, Sandra Da Silva, William Davis, Abraham Kuri Cruz, Tracey Johnston, Stephanie Servetas, Paulina Piotrowski
The gut microbiome plays a critical role in a vast and disparate set of health and disease states, including cancer and obesity. Human fecal is a complex mixture including microbes, proteins, undigested plant matter and fat content according to the diet

Signal Readout for Transition-Edge Sensor X-ray Imaging Spectrometers

May 20, 2023
Author(s)
Hiroki Akamatsu, W.Bertrand (Randy) Doriese, John Mates, Brian Jackson
Arrays of low-temperature microcalorimeters provide a promising technology for X-ray astrophysics: the imaging spectrometer. A camera with at least several thousand pixels, each of which has an energy-resolving power (E∕ΔE_FWHM) of a few thousand across a

Noncentrosymmetric Superconductor BeAu

January 4, 2018
Author(s)
A. Amon, E. Svanidze, R. Cardoso-Gil, M. N. Wilson, H. Rosner, M. Bobnar, W. Schnelle, Jeffrey W. Lynn, R. Gumeniuk, C. Hennig, G. M. Luke, H. Borrmann, A. Leithe-Jasper, Yu Grin
In noncentrosymmetric superconductors mixed spin-singlet and spin-triplet pairing can occur. In this work, physical properties of the noncentrosymmetric superconductor, BeAu, were investigated. It was established that BeAu undergoes a structural phase

Molecular Templating of Nanoporous Ultralow Dielectric Constant (approximate to 1.5) Organosilicates by Tailoring the Microphase Separation of Triblock Copolymers

September 1, 2001
Author(s)
S Y. Yang, P A. Mirau, C S. Pai, O Nalamasu, E Reichmanis, Eric K. Lin, V. J. Lee, D W. Gidley, J N. Sun
Triblock polymers, poly(ethylene oxide-b-propylene oxide-b-ethylene oxide) (PEO-b-PPO-b-PEO), are used as molecular templates in poly(methyl silsesquioxane) (MSQ) matrices to fabricate nanoporous organosilicates. Initially homogeneous blends of the

Evidence of Antiferromagnetism in Ultrathin Metallic (111)-Oriented LaNiO3 Films

December 11, 2024
Author(s)
Margaret Kane, Purnima P. Balakrishnan, Okan Koksal, Megan Holtz, Andreas Suter, Michael R. Fitzsimmons, Chao-Yao Yang, Christoph Klewe, Paige Quarterman, Timothy R. Charlton, Andrew Herzing, Zaher Salman, Thomas Prokscha, Rossitza Pentcheva, Alexander Grutter, Yuri Suzuki
Antiferromagnets with exotic spin textures promise low-power spintronic devices with extremely high operating frequencies and resistance to external perturbations. In particular, the combination of highly tunable correlated electron physics, as in complex

Three-dimensional nature 1 of anomalous Hall conductivity in YMn6Sn6-xGax, x ? 0.55

November 19, 2024
Author(s)
Albert Davydov, Hari "Bhandari ", Zhenhua Ning, Po-Hao Chang, Peter Siegfried, Resham Regmi, Mohamed El Gazzah, Allen Oliver, Liqin Ke, Igor Mazin, Nirmal Ghimire
The unique connectivity of kagome lattices gives rise to topological properties such as flat bands and Dirac cones. When combined with ferromagnetism and with the chemical potential near the 2D Dirac points, this structure offers potential for realizing

Flight demonstration of a miniature atomic scalar magnetometer based on a microfabricated rubidium vapor cell

March 3, 2023
Author(s)
Haje Korth, John Kitching, John Bonnell, Brian Bryce, George Clark, Weston Edens, Christopher Gardner, Wiliam Rachelson, Amanda Slagle
We have developed an atomic magnetometer based on the rubidium isotope 87Rb and a microfabricated silicon/glass vapor cell for the purpose of qualifying the instrument for space flight during a ride-along opportunity on a sounding rocket. The instrument

CODATA Recommended Values of the Fundamental Physical Constants: 2018

January 10, 2022
Author(s)
Eite Tiesinga, Peter J. Mohr, David B. Newell, Barry N. Taylor
We report the 2018 self-consistent values of constants and conversion factors of physics and chemistry recommended by the Committee on Data of the International Science Council (CODATA). The recommended values can also be found at physics.nist.gov

Microwave measurement beyond the quantum limit with a nonreciprocal amplifier

April 2, 2020
Author(s)
Florent Lecocq, Leonardo Ranzani, Gabriel A. Peterson, Katarina Cicak, Anja Metelmann, Shlomi S. Kotler, Raymond Simmonds, John Teufel, Jose Aumentado
The measurement of a quantum system is often performed by encoding its state in a single observable of a light field. The measurement efficiency of this observable can be reduced by loss or excess noise on the way to the detector. Even a quantum-limited

Effects of Field Annealing on MnN/CoFeB Exchange Bias Systems

June 24, 2019
Author(s)
Patrick A Quarterman, I. Hallsteinsen, M. Dunz, M. Meinert, E. Arenholz, Julie A. Borchers, Alexander J. Grutter
We report the effects of nitrogen diffusion on exchange bias in MnN/CoFeB heterostructures as a function of MnN thickness and field annealing temperature. We find that competing effects occur in which high-temperature annealing enhances exchange bias in

SURVEY OF PEPTIDE QUANTIFICATION METHODS AND THEIR REPRODUCIBILITY COMPARISON: A CASE STUDY USING OXYTOCIN

March 20, 2019
Author(s)
Chensheng Li, Sitaram Bhavaraju, Jeremy Melanson, Andreas Blomgren, Torgny Rundlof, Eric L. Kilpatrick, Timothy Rudd, Yves Aubin, Kevin Grant, Edward Saravolac, Tursun Kerim, William Sherman, Yukari Nakagawa, Sergi Pavon, Tim Weel, Arunima Pola, Dinesh Chalasani, Stephen Walfish, Fouad Atouf
USP's peptide reference standards content is typically determined using an HPLC assay against an external standard for which the purity was determined by a mass balance approach. To explore the use of other analyti-cal methods, the USP Biologics Department

Determining Carbon Fiber Composite Loading by Flip-Chip on a Coplanar Waveguide to 110GHz

November 22, 2018
Author(s)
Nina P. Basta, Jasper A. Drisko, Aaron M. Hagerstrom, Joshua A. Orlicki, Jennifer M. Sietins, Daniel B. Knorr, Jr., Edward J. Garboczi, Christian J. Long, Nathan D. Orloff
The electrical properties of materials are a necessary part of any circuit design. As applications at millimeter-wave frequen-cies increase, there is a growing need to develop new materials with low loss and multiple functionalities. Unfortunately, many

Spin currents and spin-orbit torques in ferromagnetic trilayers

March 19, 2018
Author(s)
Seung-heon C. Baek, Vivek P. Amin, Young-Wan Oh, Gyungchoon Go, Seung-Jae Lee, Geun-Hee Lee, Kab-Jin Kim, Mark D. Stiles, Byong-Guk Park, Kyung Jin Lee
Spin current generation by the spin-orbit interaction is one of the central themes in condensed matter physics. The spin Hall effect, for instance, is a bulk spin-orbit coupling effect that converts a charge current to a spin current. A recent theory
Displaying 3076 - 3100 of 3362
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