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Displaying 8076 - 8100 of 74178

A Comparison of Ion Channel Current Blockades Caused by Individual Poly(ethylene glycol) Molecules and Polyoxometalate Nanoclusters

June 28, 2019
Author(s)
Haiyan Wang, John J. Kasianowicz, Joseph W. Robertson, Dianne L. Poster, Jessica Ettedgui
Proteinaceous nanometer-scale pores have been used to detect and physically characterize many different types of molecules at the single molecule limit. The method is based on the ability to measure the transient reduction in the ionic channel conductance

Characterization of Colloidal Nanocrystal Surface Structure using Small Angle Neutron Scattering and Efficient Bayesian Parameter Estimation

June 28, 2019
Author(s)
Samuel W. Winslow, Wenbi Shcherbakov-Wu, Yun Liu, William A. Tisdale, James W. Swan
Complete structural characterization of colloidal nanocrystals is challenging due to rapid variation in the electronic, vibrational, and elemental properties across the nanocrystal surface. while electron microscopy and X-ray scattering techniques can

High Resolution Physical Characterization of Single Metallic Nanoparticles

June 28, 2019
Author(s)
Jessica Ettedgui, Jacob Forstater, Joseph W. Robertson, John J. Kasianowicz
Discrete metal oxygen clusters, polyoxometalates (POMs), can be detected at the single molecule limit, using a biological nanopore-based electronic platform. The method provides a complementary approach to traditional analytical chemistry tools utilized in

Measurement of the Antineutrino Spectrum from 235U Fission at HFIR with PROSPECT

June 28, 2019
Author(s)
Hans Pieter Mumm, Denis E. Bergeron, Mark Tyra, Svetlana Nour, Jerome LaRosa
This Letter reports the first measurement of the 235U e energy spectrum by PROSPECT, the Precision Reactor Oscillation and Spectrum experiment, operating 7.9 m from the 85MWth highly-enriched uranium (HEU) High Flux Isotope Reactor. With a surface-based

Non Nulling Measurements of Flue Gas Flows in a Coal-Fired Power Plant Stack

June 28, 2019
Author(s)
Aaron N. Johnson, Iosif I. Shinder, Bernard J. Filla, Joey T. Boyd, Rodney A. Bryant, Michael R. Moldover
Exhaust flows from coal-fired stacks are determined by measuring the flue gas velocity at prescribed points in the stack cross section. During the last 30+ years these velocity measurements have been made predominantly using S-type pitot probes. These

Biodegradable biliverdin nanoparticles for efficient photoacoustic imaging

June 27, 2019
Author(s)
Parinaz Fathi, Knox J. Hailay, Dinabandhu Sar, Indu Tripathi, Ostadhossein Fatemeh, Misra K. Santosh, Mandy Esch, Jefferson Chan, Dipanjan Pan
Here we report the synthesis of nanoparticles composed of Biliverdin cross-linked with a bifunctional amine functionalized linker. The nanoparticles display high absorbance at 365 nm and 680 nm, fluorescence when excited at 365 nm, and photoacoustic

Characterization of bubbler performance for low-volatility liquid precursor delivery

June 27, 2019
Author(s)
James E. Maslar, William A. Kimes, Brent A. Sperling, Ravindra K. Kanjolia
The performance of a bubbler to deliver the low-volatility, liquid cobalt precursor μ2- η2-(tBu- acetylene) dicobalthexacarbonyl (CCTBA) for reduced-pressure chemical vapor deposition and atomic layer deposition processes was characterized. A relatively

Colloquium: Ionic phenomena in nanoscale pores through 2D materials

June 27, 2019
Author(s)
Subin Sahu, Michael P. Zwolak
Ion transport through channels and nanoscale pores cuts across many disciplines, from single- molecule sensing to pharmacology and cellular physiology to battery and fuel cell technologies. Two-dimensional materials, such as graphene, MoS$_2$, and

High x-ray resolving power (up to 4000) utilizing asymmetric diffraction from a quartz transmission crystal measured in the 6 keV to 22 keV energy range

June 27, 2019
Author(s)
Lawrence T. Hudson, John F. Seely, Eric Galtier, Uri Feldman, Albert Henins
A Cauchois type spectrometer utilizing the (203) lattice planes at an oblique angle of 11.53o to the surface of a quartz transmission crystal recorded the Kα and Kβ spectral lines of six elements from Fe to Ag in the 6 keV to 22 keV energy range from a

Monte Carlo Sampling Bias in the Microwave Uncertainty Framework

June 27, 2019
Author(s)
Michael R. Frey, Benjamin Jamroz, Amanda Koepke, Jake Rezac, Dylan Williams
The Microwave Uncertainty Framework (MUF) is a software suite created, supported, and made publicly available by the Radio Frequency Division of the U.S. National Institute of Standards and Technology. The general purpose of the MUF is to provide automated

Automated Substitution Weighing Apparatus for Liquid Volume Measurement

June 26, 2019
Author(s)
John D. Wright, Sherry D. Sheckels, Joey T. Boyd
The custody transfer of petroleum worth $1 × 10 12 / year is traced to the volume delivered from provers and liquid test measures. Mistakes as small as 0.02 % in a custody meter calibration can lead to multi-million dollar corrections in bills. NIST

genomeview - an extensible python-based genomics visualization engine

June 26, 2019
Author(s)
Noah Spies, Justin Zook, Marc L. Salit, Arend Sidow
Visual inspection and analysis is integral to quality control, hypothesis generation, methods development and validation of genomic data. The richness and complexity of genomic data necessitates customized visualizations highlighting specific features of

Modified Entropy Scaling of the Transport Properties of the Lennard-Jones Fluid

June 26, 2019
Author(s)
Ian H. Bell, Richard A. Messerly, Monika Thol, Lorenzo Costigliola, Jeppe Dyre
Separated by twenty-two years, Rosenfeld proposed two different scaling approaches to model the transport properties of fluids, one valid in the dilute gas, and another in the liquid phase. In this work, we demonstrate that these two limiting cases can be

Reproducibility of Liquid Micro-Flow Measurements

June 26, 2019
Author(s)
John D. Wright, James W. Schmidt
New applications in biology, medicine, and manufacturing require reliable measurements of liquid flows smaller than 100 υL/min. NIST addressed this requirement by improving the reliability and ease of use of NIST’s Dynamic Gravimetric Micro-Flow Standard

Singular Angular Magnetoresistance in a Magnetic Nodal Semimetal

June 26, 2019
Author(s)
T. Suzuki, L. Savary, J.-P. Liu, Jeffrey W. Lynn, L. Balents, J. G. Checkelsky
Transport coefficients are incisive experimental probes of the low energy, long wavelength properties of correlated electron systems often useful for mapping hidden phases with distinct symmetries. Here we report a new transport signature of spontaneous

Competing Polar and Antipolar Structures in the Ruddlesden-Popper Layered Perovskite Li 2 SrNb 2 O 7

June 25, 2019
Author(s)
Ritesh Uppuluri, Hirofumi Akamatsu, Arnab Sen Gupta, Huaiyu Wang, Craig Brown, Kleyser E. Agueda Lopez, Nasim Alem, Venkatraman Gopalan, Thomas E. Mallouk
Over the past few years, several studies have reported the existence of polar phase in n=2 Ruddlesden-Popper layer perovskites by trilinear coupling of oxygen octahedral rotations (OOR) and polar distortions, a phenomenon termed as hybrid improper
Displaying 8076 - 8100 of 74178