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Displaying 51 - 75 of 3859

Low-GWP Alternative Refrigerant Blends for HFC-134a: Interim Report

October 13, 2021
Author(s)
Piotr A. Domanski, Mark O. McLinden, Valeri I. Babushok, Ian Bell, Tara Fortin, Michael Hegetschweiler, Mark A. Kedzierski, Dennis Kim, Lingnan Lin, Gregory T. Linteris, Stephanie L. Outcalt, Richard A. Perkins, Aaron Rowane, Harrison M. Skye
This project addresses the objectives of the Statement of Need number WPSON-17-20 "No/Low Global Warming Potential Alternatives to Ozone Depleting Refrigerants." Its goal is to identify and demonstrate performance of low global-warming-potential (GWP), non

A Continuum-Atomistic Simulation of Heat Transfer in Micro- and Nano-Flows

October 12, 2021
Author(s)
J Liu, S Chen, Xiaobo Nie, M O. Robbins
We develop a hybrid atomistic-continuum scheme for simulating micro- and nano- flows with heat transfer. The approach is based on spatial ''domain decomposition'' in which molecular dynamics (MD) is used in regions where atomistic details are important

A New Reactive Molecular Dynamics Model Of Polymer Pyrolysis

October 12, 2021
Author(s)
Stanislav Stoliarov, Kenneth D. Smith, P R. Westmoreland, Richard E. Lyon, Marc R. Nyden
In this paper, we report progress that has been made in the development of an extension of classical force-field-based molecular dynamics (MD) to the simulation of chemical reactions. We review several studies of polymer pyrolysis that were performed using

Computations of Particle Surface Characteristics Using Optical and X-Ray CT Images

October 12, 2021
Author(s)
E Masad, S Saadeh, T Al-Rousan, Edward Garboczi, D Little
The description of particle surface characteristics is of interest in many disciplines in science and engineering such as powder technology, geology, soil science, and infrastructure materials. Consequently, there is a need to develop methods to quantify

Consistent Estimation of Poisson Intensity in the Presence of Dead Time

October 12, 2021
Author(s)
S X. He, Grace L. Yang, K T. fang, J F. Widmann
Phase Doppler Interferometry (PDI) is a non-intrusive technique frequently used to obtain information about spray characteristics. Understanding spray characteristics is of critical importance in many areas of science, including liquid fuel spray

Detection of Smoke From Microgravity Fires

October 12, 2021
Author(s)
D L. Urban, DeVon Griffin, Gary Ruff, Thomas Cleary, Jiann C. Yang, George W. Mulholland, Zeng-guang Yuan
The history and current status of spacecraft smoke detection is discussed including a review of the state of understanding of the effect of gravity on the resultant smoke particle size. The results from a spacecraft experiment (Comparative Soot Diagnostics

Development and Interpretation of the Security Rating Index

October 12, 2021
Author(s)
Jonathan Sylvie, Stephen R. Thomas, Sang-Hoon Lee, Robert E. Chapman
This article is a follow-on publication to Addressing Security in the Early Stages of the Project Life Cycle. It details the development and interpretation of the Security Rating Index (SRI), which provides a means of quantitatively assessing the level of

Effects of Aspect Ratio of Multi-Walled Carbon Nanotube on Flammability Properties of Polymer Nanocomposites

October 12, 2021
Author(s)
Bani Cipiriano, Takashi Kashiwagi, Srinivasa R. Raghavan, Ying Yang, E A. Grulke, Kazuya Yamammoto, John R. Shields, Jack F. Douglas
The effects of the aspect ratio of multi-walled carbon nanotube (MWNT) on viscoelastic properties and flammability properties of PS/MWNT nanocomposites are studied with two different MWNTs having average aspect ratios of 49 and 150. While no significant

Energy-Based Design Approach for Seismic Design: Energy Spectra

October 12, 2021
Author(s)
P Khashaee, B Mohraz, Fahim H. Sadek, Hai S. Lew, John L. Gross
Among the approaches that the Structural Engineers Association of California has recommended for performance based seismic design is the energy approach. In this approach, the earthquake input energy transmitted to the structure is estimated from ground

Feasibiliy and Fidelity of Data Exchange Through IFC for Building Commissioning

October 12, 2021
Author(s)
Hongjun Wang, Burcu Akinci, J H. Garrett, K A. Reed
The building commissioning (BC) process ensures that the various interacting systems in a building are properly installed and operating. It is a process requiring extensive data exchange among different participants across multiple project phases. The

Hydrolysis-Controlled Transport of Water in Polymeric Coatings

October 12, 2021
Author(s)
Sanghun Lee, Tinh Nguyen, Jonathan W. Martin, E Byrd
Thermoset acrylic melamine coatings are widely used for exterior structures. These materials are formulated by reacting an acrylic polyol with an alkylated melamine. Because the reactions are reversible, acrylic-melamine coatings tend to hydrolyze during

Imidazolium Modified Clay Based ABS Nanocomposites: A Comparison Between Melt-Blending and Solution Sonication Processes

October 12, 2021
Author(s)
M Modesti, S Besco, A Lorenzetti, Mauro Zammarano, V Causin, C Marega, Jeffrey W. Gilman, D M. Fox, Paul C. Trulove, Hugh C. De Long, P H. Maupin
Acrylonitrile-butadiene-styrene (ABS) nanocomposites containing imidazolium-modified montmorillonite have been prepared by melt-blending and solution-sonication in order to study the effects of processing on the morphology and properties of the polymer

Layered Double Hydroxides as Cation Exchange Materials

October 12, 2021
Author(s)
Paul Braterman, Nandika A. D'Souza, Jeffrey W. Gilman, Mickey C. Richardson, Laxmi K. Sahu, Mauro Zammarano
Layered double hydroxides (LDH) are a class of materials formally related to brucite-like hydroxides by the incorporation of higher valent cations, such as Al(III). The layer charge is neutralized by the insertion of any of a large range of exchangeable
Displaying 51 - 75 of 3859