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Displaying 276 - 300 of 143537

An Analysis of Aerosol Dynamics with Diffusion-Limited Growth in a Batch Reactor

December 16, 2024
Author(s)
Jiann Yang, Thomas Cleary, George Mulholland
A set of approximate first-order ordinary differential equations was derived from the general dynamic equation (GDE) to study the aerosol dynamics with homogeneous nucleation and condensational diffusion-limited growth in an isothermal batch reactor. A

Recommendations for assessing commutability of a replacement batch of a secondary calibrator certified reference material

December 16, 2024
Author(s)
Liesbet Deprez, Jesper Johansen, Thomas Keller, Jeffrey Budd, Neil Greenberg, Cas Weykamp, Sverre Sandberg, MAURO PANTEGHINI, Ferruccio Ceriotti, Elizabeth Barczak, Robert Rej, Pernille Kjeilen Fauskanger, Finlay MacKenzie, Johanna Camara, Alicia Lyle, W. Greg Miller, VINCENT DELATOUR
Commutable secondary certified reference materials (CRMs) play an essential role in the calibration hierarchy of many in-vitro diagnostic measurement procedures used in the medical laboratory. Therefore, sustainable availability of these CRMs is crucial to

Thermal Exposure of Objects Near Burning Electrical Enclosures

December 16, 2024
Author(s)
Kevin McGrattan, Isaac Leventon
This report documents a series of fire experiments performed within steel electrical enclosures and on open "ladder back" cable trays. The first objective is to measure the heat release rates and qualitatively understand the burning behavior of circuit

PVDF-based Backsheet Cracking: Mapping In Situ Phase Evolution by X-ray Scattering

December 15, 2024
Author(s)
Stephanie Moffitt, Sona Ulicna, Song-Syun Jhang, Po-Chang Pan, Michael Owen-Bellini, Peter Hacke, Michael Kempe, Jared Tracy, Kaushik Choudhury, Laura Schelhas, Xiaohong Gu
One of the most common polymers in commercial photovoltaic (PV) backsheets is polyvinylidene fluoride (PVDF). However, recent reports have shown the potential for PVDF-based backsheets to crack and fail prematurely. Previous work has suggested that polymer

Per- and Polyfluoroalkyl Substances in Textiles Present in Firefighter Gloves, Hoods, and Wildland Gear

December 13, 2024
Author(s)
Andre Thompson, Andrew Maizel, Meghanne Tighe, Samuel Escobar Veras, Alix Rodowa, Bruce Benner, Audrey Tombaugh, Jessica Reiner, Michelle Donnelly, Ryan Falkenstein-Smith, John Kucklick, Catherine Rimmer, Rick Davis
Firefighter turnout gear has been found to contain per- and polyfluoroalkyl substances (PFAS) and is a potential source of PFAS exposure to firefighters. However, previous evaluations of firefighter exposure to PFAS through personal protective gear has

An Electrically Conducting Metal-Organic Framework Having Two Orthogonal Transport Pathways

December 12, 2024
Author(s)
Shiyu Zhang, Weikang Zhang, Ashok Yadav, Md. Ansari, Jonathan Cromer, Jorge Moreno, Gavin McCarver, Wei Zhou, Sourav Saha
Owing to their diverse potential applications in electronics and energy technologies, electrically conducting metal–organic frameworks (EC-MOFs) have emerged as one of the most coveted functional materials of the twenty-first century. Among various MOF

CCQM_Retrospectoscope Reference Manual: A detailed reference to the CCQM_Retrospectoscope, a suite of graphical tools for the meta-analysis of measurement results from CCQM studies

December 12, 2024
Author(s)
David L. Duewer, Christina Cecelski, Michael Nelson
This document is a detailed reference manual for the 1-September-2024 version of the CCQM_Retrospectoscope system. The CCQM_Retrospectoscope combines a nominally complete database of results from Consultative Committee for the Amount of Substance

NIST conference papers fiscal year 2024

December 12, 2024
Author(s)
Kathryn Miller, Myriam Dilawari, Julie Jew
This Special Publication represents the work of researchers at professional conferences, as reported by NIST employees in Fiscal Year 2024 (October 1, 2023–September 30, 2024).

DAmodel: Hierarchical Bayesian Modelling of DA White Dwarfs for Spectrophotometric Calibration

December 11, 2024
Author(s)
Benjamin M. Boyd, Gautham Narayan, Kaisey Mandel, Matthew Grayling, Aidan Berres, Mai Li, Aaron Do, ABHIJIT SAHA, Tim Axelrod, Thomas Matheson, Edward W Olszewski, ralph bohlin, Annalisa Calamida, Jenna Claver, Susana Deustua, Jay Holberg, Ivan Hubeny, John MacKenty, Konstantin Malanchev, Sean Points, Armin Rest, Elena Sabbi, Christopher Stubbs
standards (16.5 V 19.5) alongside the three CALSPEC standards, from 900 Å to 32 μm. The framework is the first of its kind to jointly infer photometric zeropoints and WD parameters (log g, Teff, AV , RV ) by simultaneously modelling both photometric and

temo: teqp-based model optimization

December 10, 2024
Author(s)
Ian Bell
The temo library is a set of building blocks that facilitate the automation of fitting models to experimental data for thermodynamic properties. The library is written in Python to enable broad re‐use and is based upon the suite of thermodynamic equations

A 4-mW 2.2-6.9 GHz LNA in 16nm FinFET Technology for Cryogenic Applications

December 9, 2024
Author(s)
Runzhou Chen, Hamdi Mani, Phil Marsh, Richard Al Hadi, Pragya Shrestha, Jason Campbell, Christopher Chen, Hao-Yu Chen, Kosmas Galatsis, Mau-Chung Frank Chang
This work presents the design and measurement of a low-power wide-band cryogenic low-noise amplifier (LNA) that operates in a wide temperature range using 16nm FinFET technology. The LNA is packaged and measured at both room and cryogenic temperatures. It

Activity measurements and calibrations for 225Ac in radioactive equilibrium with its progeny

December 9, 2024
Author(s)
Denis Bergeron, Gulakhshan Hamad, Brittany Broder, Jeffrey Cessna, Adam Pearce, Jerome LaRosa, Leticia Pibida, Brian E. Zimmerman
The massic activity of 225Ac in 0.1 mol/L HCl was measured by multiple primary methods over four consistent measurement campaigns. Results from the triple-to-double coincidence ratio (TDCR) method of liquid scintillation (LS) counting were in accord with

Magneto-Ionic Physical Reservoir Computing

December 9, 2024
Author(s)
Md Mahadi Rajib, Dhritiman Bhattacharya, Christopher Jensen, Gong Chen, Fahim F. Chowdhury, Shouvik Sarkar, Kai Liu, Jayasimha Atulashimha
Recent progresses in magneto-ionics offer exciting potentials to leverage its non-linearity, short-term memory, and energy-efficiency to uniquely advance the field of physical reservoir computing. In this work, we experimentally demonstrate the

Surface photooxidation of polypropylene-based photovoltaic backsheets: A comprehensive spectroscopic investigation

December 8, 2024
Author(s)
Karissa Jensen, Ashlee Aiello, Stefan Mitterhofer, Chiara Barretta, Gernot Oreski, Christopher Stafford, Xiaohong Gu
The prospect of cost reduction, enhanced performance, and improved sustainability has been driving innovation in the development of new backsheet materials for photovoltaic (PV) modules in recent years. Among the materials of interest, polypropylene (PP)

Variable Gain DNA Nanostructure Charge Amplifiers for Biosensing

December 7, 2024
Author(s)
Jacob Majikes, Seulki Cho, Thomas Cleveland, James Liddle, Arvind Balijepalli
Electronic measurements of engineered nanostructures comprised solely of DNA (DNA nanostructures) enable new signal conditioning modalities in biosensing. Here, we demonstrate how these DNA nanostructures alter their conformation upon binding a nucleic

Development and performance of a low-cost, solid-state, thermal neutron sensor with a 10B converter

December 5, 2024
Author(s)
Priscila Costa, Jamie Weaver, M Raele, Kevin Pritchard, Juscelino Leao, C Domienikan, Nicholas C. Maliszewskyj, F da Silva, W Pereira, Frederico Genezini
This study demonstrates the construction and operation of a portable, solid-state thermal neutron sensor that utilizes a photodiode coated with a thin layer of boron-10 (10B). The boron layer was created using pulsed laser deposition and analyzed through
Displaying 276 - 300 of 143537