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Displaying 10376 - 10400 of 73893

Designing Molecular Building Blocks for the Self-assembly of Complex Porous Networks

March 19, 2019
Author(s)
Tiara A. Maula, Harold Hatch, Vincent K. Shen, Rangarajan Srinivas, Jeetain Mittal
Molecular building blocks which self-assemble into large ordered porous networks have been long sought-after, and have led to the development of metal organic frameworks and covalent organic frameworks. However, despite the great potential possessed by

Ramsey Spectroscopy with Displaced Frequency Jumps

March 19, 2019
Author(s)
Moshe Shuker, Juniper Wren Y. Pollock, Rodolphe Boudot, V. I. Yudin, A. V. Taichenachev, John E. Kitching, Elizabeth A. Donley
Sophisticated Ramsey-based interrogation protocols using composite laser pulse sequences have been recently proposed to provide in next-generation high-precision atomic clocks a near perfect elimination of frequency shifts induced during the atom-probing

Removal of Synthetic Azo Dye using Bimetallic Nickel-Iron Nanoparticles

March 19, 2019
Author(s)
Shelby Foster, Katie Estoque, Michael Voecks, Nikki Rentz, Lauren Greenlee
Bimetallic nanoparticles comprised of Iron (Fe) and Nickel (Ni) were investigated for the removal of an azo dye contaminant in water. NiFe nanoparticles were synthesized using a batch aqueous synthesis method that is scalable and environmentally safe

A Rydberg Atom-Based Mixer: Measuring the Phase of a Radio Frequency Wave

March 18, 2019
Author(s)
Christopher L. Holloway, Matthew T. Simons, Abdulaziz H. Haddab, Joshua A. Gordon
Rydberg atoms have been shown to be very useful in performing absolute measurements of the magnitude of a radio frequency (RF) field using electromagnetically-induced transparency (EIT). However, there has been less success in using Rydberg atoms for the

Correlated Spin Canting in Ordered Core-Shell Fe 3 O 4 /Mn x Fe 3-x Od4^ Nanoparticle Assemblies

March 18, 2019
Author(s)
Y. Ijiri, Kathryn L. Krycka, I. Hunt-Isaak, H. Pan, J. Hsieh, Julie Borchers, James Jennings Rhyne, Samuel D. Oberdick, A. Abdelgawad, S. A. Majetich
Polarization-analyzed small-angle neutron scattering methods are used to determine the spin arrangements in ordered three-dimensional assemblies of 7.4 nm diameter core-shell Fe 3O 4/Mn xFe 3-xO 4 nanoparticles. In moderate to high magnetic fields, the

Optimization of Time-and Code-Division-Multiplexed Readout for Athena X-IFU

March 18, 2019
Author(s)
William B. Doriese, Simon R. Bandler, Saptarshi Chaudhuri, Carl S. Dawson, Edward V. Denison, Shannon M. Duff, Malcolm S. Durkin, C. T. FitzGerald, Joseph W. Fowler, Johnathon D. Gard, Gene C. Hilton, Kent D. Irwin, Young I. Joe, Kelsey M. Morgan, Galen C. O'Neil, Christine G. Pappas, Carl D. Reintsema, David A. Rudman, Stephen J. Smith, Robert W. Stevens, Daniel S. Swetz, Paul Szypryt, Joel N. Ullom, Leila R. Vale, Joel C. Weber, B. A. Young
Readout of a large, spacecraft-based array of superconducting transition-edge sensors (TESs) requires careful management of the layout area and power dissipation of the cryogenic-circuit components. We present three optimizations of our time- (TDM) and

Data for secondary electron production from ion precipitation at Jupiter II: Simultaneous and non-simultaneous target and projectile processes in collisions of Oq+ + H2 (q=0-8)

March 15, 2019
Author(s)
David R. Schultz, Heman Gharibnejad, Thomas Cravens, Stephen Houston
To improve the physical completeness of the data previously calculated [Schultz et al. ADNDT 113, 1 (2016)] to enable modeling of the effects of secondary electrons produced by energetic ion precipitation at Jupiter, we extend the treatment to include

interlab: A Python module for analyzing interlaboratory comparison data

March 15, 2019
Author(s)
David A. Sheen
interlab was developed as a software tool to perform consensus analysis on spectral data from interlaboratory studies. It is designed to estimate the spread in the spectral data and to identify possible outliers among both spectral populations and

Bubble Point Measurements of Neopentane + Ethane Mixtures

March 14, 2019
Author(s)
Elisabeth Mansfield, Vladimir Diky
Bubble point measurements have been taken on three compositions of neopentane + ethane systems. The results are modeled with a Peng-Robinson equation with symmetrical mixing rule and a Helmholtz-energy based 4-parameter model. Interaction parameters for

Microporous Metal-Organic Framework with Dual Functionalities for Efficient Separation of Acetylene from Light Hydrocarbon Mixtures

March 14, 2019
Author(s)
Hao Li, Libo Li, Rui-Biao Lin, Giorgio Ramirez, Wei Zhou, Rajamani Krishna, Zhangjing Zhang, Shengchang Xiang, Banglin Chen
Separating acetylene from light hydrocarbon mixtures like ethylene is a very important process for downstream industrial applications. Herein, we report a new MOF [CuL 2(SiF 6)](UTSA-220, L = 1E,2E)-1,2-bis(pyridin-4-ylmethylene)hydrazine) with dual

Multi-Energy X-Ray Tomography of an Optical Fiber: The Role of Spatial Averaging

March 14, 2019
Author(s)
Zachary H. Levine, Adele P. Peskin, Edward J. Garboczi, Andrew Holmgren
Using a commercial X-ray tomography instrument, we have obtained reconstructions of a graded-index optical fiber with voxels of edge length 1.05 µm at 12 tube voltages. The fiber manufacturer created a graded index in the central region by varying the

Pore Space Partition within a Metal-Organic Framework for Highly Efficient C 2 H 2 /CO 2 Separation

March 14, 2019
Author(s)
Yingxiang Ye, Zhenlin Ma, Rui-Biao Lin, Rajamani Krishna, Wei Zhou, Quanjie Lin, Zhangjing Zhang, Shengchang Xiang, Banglin Chen
The pore space partition (PSP) approach has been employed to realize a novel porous MOF (FJU-90) with dual functionalities for the challenging C 2H 2/CO 2 separation under ambient conditions. By virtue of a triangular ligand (Tripp = 2,4,6-tris-(4-pyridyl

Probing Membrane Association of a-Synuclein Domains with VDAC Nanopore Reveals Unexpected Binding Pattern

March 14, 2019
Author(s)
Daniel Jacobs, David Hoogerheide, Amandine Rovini, Zhiping Jiang, Jennifer C. Lee, Tatiana K. Rostovtseva, Sergey M. Bezrukov
It is well established that α-synuclein (α-syn) binding from solution to the surface of membranes composed of negatively charged and/or non-lamellar lipids can be characterized by equilibrium dissociation constants of tens of micromolar. Previously, we

Using Distributed Agents to Optimize Thermal Energy Storage

March 14, 2019
Author(s)
Amanda Pertzborn
The Intelligent Building Agents Laboratory (IBAL) at the National Institute of Standards and Technology (NIST) will be used to develop and evaluate advanced control systems for commercial building heating, ventilation, and air conditioning (HVAC)

Influence of Knot Complexity on Glass-Formation in Ring Polymer Melts

March 13, 2019
Author(s)
Luis F. Vargas Lara, Beatriz Pazmino, Jack F. Douglas
We perform molecular dynamic simulations on a coarse-grained polymer melt to study the dynamics of glass-formation in ring polymer melts of variable knot complexity. After generating melts of non-concatenated polymeric rings having a range of minimum

ELECTRON ENERGY-LOSS SPECTROSCOPY AND IMAGING

March 12, 2019
Author(s)
Vladimir P. Oleshko
This article describes electron energy-loss spectroscopy (EELS), energy-filtering transmission electron microscopy (EFTEM) and electron spectroscopic diffraction (ESD) in a transmission electron microscope (TEM) or in a scanning transmission electron
Displaying 10376 - 10400 of 73893
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