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Displaying 376 - 400 of 1014

CO2 Capture and Positional Disorder in Bis(135-benzenetricarboxylate) Tri-copper Hydrate: An In Situ Laboratory X-ray Powder Diffraction Study

November 11, 2015

Author(s)

Winnie K. Wong-Ng, Igor Levin, James A. Kaduk, Laura Espinal, Hui Wu

Ambient-temperature capture of CO2 by metal-organic framework Cu3(BTC)2 (BTC ≡ 1,3,5-benzenecarboxylate), known as HKUST-1, have been studied in situ in a laboratory X-ray powder diffractometer under gas-flowing conditions. The diffraction patterns were

Comparison of halocarbon measurements in an atmospheric dry whole air sample

November 3, 2015

Author(s)

George C. Rhoderick, Bradley Hall, Christina Harth, Jin Seog Kim, Jeogsoon Lee, Stephen Montzka, J. Muhle, Stefan Reimann, Martin Vollmer, Ray Weiss

The growing awareness of climate change/global warming, and continuing concerns regarding stratospheric ozone depletion, will require continued measurements and standards for many compounds, in particular halocarbons that are linked to these issues. In

Depth profiling of degradation of multilayer photovoltaic backsheets after accelerated laboratory weathering: I. Raman imaging

October 6, 2015

Author(s)

Chiao-Chi Lin, Peter J. Krommenhoek, Stephanie S. Watson, Xiaohong Gu

In this study, Raman imaging was used to depth profiling the chemical degradation of a commercial PPE (polyethylene terephthalate (PET)/PET/ethylene vinyl acetate (EVA)) backsheet films during exposure with UV irradiance of 170 W/m2 (300 nm to 400 nm) at

Characterizing intimate mixtures of materials in hyperspectral imagery with albedo-based and kernel-based approaches

September 1, 2015

Author(s)

Robert S. Rand, David W. Allen, Ronald G. Resmini

Linear mixtures of materials in a scene often occur because the pixel size of a sensor is relatively large and consequently they contain patches of different materials within them. This type of mixing can be thought of as areal mixing and modeled by a

Hitting the bounds of chemistry: Limits and tradeoffs for low-GWP refrigerants.

August 19, 2015

Author(s)

Mark O. McLinden, J. Steven Brown, Andrei F. Kazakov, Piotr A. Domanski

We explore the possibilities for low-GWP refrigerants through two approaches. First, we explore the performance of hypothetical refrigerants to define the limits of what is allowed by thermodynamics. In the second approach, we apply property estimation

Research highlights: detecting, characterizing and quantifying the presence and impact of carbon nanomaterials in environmental systems

August 1, 2015

Author(s)

John M. Pettibone, Stacey M. Louie

Here, we highlight articles examining different aspects contributing to the fate and role of carbon nanomaterials in environmental systems by developing new insight through measurement methodologies or systematic approaches. The first study examined the

Density Functional Theory Meta-GGA+U Study of Water Incorporation in the Metal Organic Framework Material Cu-BTC

July 14, 2015

Author(s)

Eric J. Cockayne, Eric B. Nelson

Water absorption in the metal-organic framework (MOF) material Cu-BTC, up to a concentration of 3.5 H2O per Cu ion, is studied via density functional theory at the meta-GGA+U level. The stable arrangements of water molecules show chains of hydrogen-bonded

Thermodynamic Properties of trans-1-chloro-3,3,3-trifluoropropene (R1233zd(E)): Vapor Pressure, (p, ?, T) Behavior, and Speed of Sound Measurements and Equation of State

July 8, 2015

Author(s)

Mar?a E. Mond?jar, Mark O. McLinden, Eric Lemmon

We present experimental measurements of the density, speed of sound, and vapor pressure of trans-1-chloro-3,3,3-trifluoropropene, which is also known as R1233zd(E). Densities were measured over the temperature range from (215 to 444) K, with pressures from

A new method to study variation of aerosol optical properties using 3-D reconstructions

June 22, 2015

Author(s)

Diana Ortiz-Montalvo, Joseph M. Conny

Ambient particles are ubiquitous in the atmosphere and exert a strong influence on the climate by altering the Earth's radiative balance. Aerosol interactions with sunlight arise from their optical properties (e.g., scattering and absorption); however

Research highlights: Elucidating the role of complex interactions affecting nanoparticle deposition

June 1, 2015

Author(s)

Stacey M. Louie, John M. Pettibone

In this issue, we highlight recent works that advance our understanding of physicochemical mechanisms governing nanoparticle (NP) deposition in the environment. In one study, the transport of citrate-stabilized silver NPs in an unsaturated porous medium

Guidelines for Radiometric Calibration of Electro-Optical Instruments for Remote Sensing

May 8, 2015

Author(s)

Howard W. Yoon, Raghu N. Kacker

This publication provides guidelines for conducting radiometric calibrations of electro-optical (EO) sensors. It is intended for use by managers, technical oversight personnel, scientists, and engineers as a reference for planning and successfully

Perfluorinated Alkyl Acids in Wildlife

April 21, 2015

Author(s)

Jessica L. Reiner, Benjamin J. Place

The first measurements of perfluorinated compounds (PFCs) in wildlife from the aqueous and terrestrial environment showed their ubiquitous presence. Since the initial studies in 2001 their presence, distribution, and fate in the environment has broadly

A Fundamental Equation of State for 1,1,1,3,3-Pentafluoropropane (R-245fa)

March 26, 2015

Author(s)

Ryo Akasaka, Yong Zhou, Eric Lemmon

A new fundamental equation of state explicit in the Helmholtz energy is presented for 1,1,1,3,3 pentafluoropropane (R 245fa), based on recent experimental data for the vapor pressures, densities, and vapor sound speeds. The functional form now uses