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Displaying 7376 - 7400 of 74115

Measurement of mass of aerosol particles

October 30, 2019
Author(s)
Kevin J. Coakley, Robert C. Hagwood, Kensei Ehara, Nobuhiko Fukushima, Kittichote Worachotekamjorn, Naoko Tajima, Hiromu Sakurai
An aerosol particle mass analyzer (APM) which classifies aerosol particles according to their mass has been developed. Mass distributions of aerosol particles can be measured by the APM combined with a particle counting device. Particle mass that can be

Optical-Clock-Based Time Scale

October 30, 2019
Author(s)
Jian Yao, Jeffrey A. Sherman, Tara M. Fortier, Andrew D. Ludlow, Holly Leopardi, Thomas E. Parker, William F. McGrew, Scott A. Diddams, Judah Levine
A time scale is a procedure for accurately and continuously marking the passage of time. It is exemplified by coordinated universal time (UTC), and provides the backbone for critical navigation tools such as the global positioning system (GPS). Present

Phase-Appropriate Application of Analytical Methods to Monitor Subvisible Particles Across the Biotherapeutic Drug Product Life Cycle

October 30, 2019
Author(s)
Roman Mathaes, Linda Narhi, Andrea Hawe, Anja Matter, Karoline Bechtold-Peters, Sophia Kenrick, Sambit Kar, Olga Laskina, John Carpenter, Richard E. Cavicchi, Ellen Koepf, Neil Lewis, Rukman De Sliva, Dean C. Ripple
The phase-appropriate application of analytical methods to characterize, monitor, and control particles is an important aspect of the development of safe and efficacious biotherapeutics. The AAPS Product Attribute and Biological Consequences (PABC) focus

Your Mileage May Vary

October 30, 2019
Author(s)
Elena R. Messina
Requiring and rethinking reproducibility will foster faster progress in robotics.

Structure and Dynamics of Spherical and Rodlike Alkyl Ethoxylate Surfactant Micelles Investigated using NMR Relaxation and Atomistic Molecular Dynamics Simulations

October 29, 2019
Author(s)
Allison Talley Edwards, Abdolreza Javidialesaadi, Kathleen Weigandt, George Stan, Charles D. Eads
Predicting and controlling the properties of amphiphile aggregate mixtures requires understanding the arrangements and dynamics of the constituent molecules. To explore these topics, we study molecular arrangements and dynamics in alkyl ethoxylate nonionic

Label-free surface acoustic wave-based embedded flow sensor

October 27, 2019
Author(s)
Aurore F. Quelennec, Jason J. Gorman, Darwin Reyes-Hernandez
This paper presents a calibration/label-free flow sensor embedded in a microfluidic system. This sensor is based on surface acoustic waves, where the acoustic intensity is dependent on the flow rate of the propagating medium. The range of flow rates

Live quantification of cell viability via neutral red uptake using lens-free imaging

October 27, 2019
Author(s)
Brian J. Nablo, Jungjoon Ahn, Kiran Bhadriraju, Jong M. Lee, Darwin Reyes-Hernandez
We present the quantification of cell viability during neutral red (NR) uptake with a compact lens-free system utilizing two light sources. Conventionally, the NR uptake assay determines cell viability based on the accumulation of NR within lysosomes and

A stroboscopic approach to trapped-ion quantum information processing with squeezed phonons

October 24, 2019
Author(s)
Wenchao Ge, Brian C. Sawyer, Joseph W. Britton, Kurt Jacobs, Michael Foss-Feig, John Bollinger
In trapped-ion quantum information processing, interactions between spins (qubits) are mediated by collective modes of motion of an ion crystal. While there are many different experimental strategies to design such interactions, they all face both

Airflow and Indoor Air Quality Models of DOE Prototype Commercial Buildings

October 24, 2019
Author(s)
Lisa C. Ng, Amy Musser, Andrew K. Persily, Steven J. Emmerich
An previous report, NIST Technical Note 1734, Airflow and Indoor Air Quality Models of DOE Reference Commercial Buildings [1], detailed the CONTAM models of the 16 U. S. Department of Energy (DOE) reference commercial building models. DOE developed the

Clusters of Nanoscale Liposomes Modulate the Release of Encapsulated Species and Mimic the Compartmentalization Intrinsic in Cell Structures

October 23, 2019
Author(s)
Igor Kevin Mkam Tsengam, Marzhana Omarova, Lauren Shepherd, Nicholas Sandoval, Jibao He, Elizabeth Kelley, Vijay John
We report the ability to place a high concentration of liposomes in a confined volume as a multicompartment cluster that mimics biological cells and allows for the modulation of release of encapsulated species. The formation of these coated

Coexistence of Ferromagnetic Fluctuations and Superconductivity in the Actinide Superconductor UTe 2

October 23, 2019
Author(s)
Shyam Sundar, S. Gheidi, K. Akintola, A. M. Cote, S. R. Dunsiger, S. Ran, Nicholas Butch, S. R. Saha, J. Paglione, J. E. Sonier
We report low-temperature muon spin relaxation/rotation (υSR) measurements on single crystals of the actinide superconductor UTe 2. Below 5 K we observe a continuous slowing down of magnetic fluctuations, which persists through the superconducting

Absolute quantification of RNA or DNA using acid hydrolysis and mass spectrometry

October 22, 2019
Author(s)
Mark S. Lowenthal, Eva Quittman, Karen W. Phinney
Accurate, traceable quantification of ribonucleotide or deoxyribonucleotide oligomers is achievable using acid hydrolysis and isotope dilution mass spectrometry (ID-MS). In this work, formic acid hydrolysis is demonstrated to generate stoichiometric

Compartment Fire Experiments on Long-Span Composite-Beams with Simple Shear Connections Part 1: Experiment Design and Beam Behavior at Ambient Temperature

October 22, 2019
Author(s)
Selvarajah Ramesh, Lisa Choe, Mina S. Seif, Matthew Hoehler, William L. Grosshandler, Ana Sauca, Matthew Bundy, William E. Luecke, Yi Bao, Matthew Klegseth, Genda Chen, John Reilly, Branko Glisic
The National Institute of Standards and Technology recently expanded its large-scale structural-fire testing capabilities in the National Fire Research Laboratory. A landmark test series was conducted on long-span steel-concrete composite floor beams

Development of a Standard Fire Condition for a Large Compartment Floor Assembly

October 22, 2019
Author(s)
Ana Sauca, Chao Zhang, William L. Grosshandler, Matthew Bundy, Lisa Choe
This report presents the experimental investigation of a test fire in a large compartment of about 10 m wide, 7 m deep and 3.8 m high constructed in the National Fire Research Laboratory of the National Institute of Standards and Technology. The test fire

Embedding a Rydberg Atom-Based Sensor into an Antenna for Phase and Amplitude Detection of Radio Frequency Fields and Modulated Signals

October 22, 2019
Author(s)
Christopher L. Holloway, Matthew T. Simons, Abdulaziz H. Haddab, Joshua A. Gordon, David R. Novotny
We demonstrate a Rydberg atom-based sensor embedded in a parallel-plate waveguide (PPWG) for amplitude and phase detection of a radio-frequency (RF) electric field. This embedded atomic sensor is also capable of receiving modulated communications signals

Spin Seebeck Imaging of Spin-Torque Switching in Antiferromagnetic Pt/NiO Heterostructures

October 22, 2019
Author(s)
Isaiah Gray, Takahiro Moriyama, Nikhil Sivadas, Gregory M. Stiehl, John T. Heron, Ryan F. Need, Brian Kirby, David H. Low, Katja Nowack, Darrell G. Schlom, Daniel C. Ralph, Teruo Ono, Gregory D. Fuchs
We demonstrate the spin Seebeck microscope as a sensitive method for imaging in-plane antiferromagnetic order in thin films. Recently, antidamping spin-orbit torques have been used to reorient Neel order in antiferromagnetic devices. Although the readout

Vapor deposition of a nonmesogen prepares highly structured organic glasses

October 22, 2019
Author(s)
Camille Bishop, Jacob L. Thelen, Eliot Gann, Michael F. Toney, Lian Yu, Dean DeLongchamp, Mark D. Ediger
We show that glasses with aligned smectic liquid crystal-like order can be produced by physical vapor deposition of a molecule without any equilibrium liquid crystal phases. Smectic-like order in vapor-deposited films was characterized by wide-angle X-ray
Displaying 7376 - 7400 of 74115