Results 31 to 40 of about 8,766 (125)

Temperature‐Dependent Optical Properties of Ice Crystals in the Far‐Infrared Regime

Geophysical Research Letters, Volume 52, Issue 12, 28 June 2025.
Abstract A database of temperature‐dependent hexagonal ice aggregate optical properties in the far‐infrared (FIR) spectrum is developed to support FIR missions, particularly the current Polar Radiant Energy in the Far InfraRed Experiment and the upcoming Far‐infrared‐Outgoing‐Radiation Understanding and Monitoring.
Tong Ren, Ping Yang, Helen E. Brindley, Tristan S. L’Ecuyer, Tiziano Maestri   +4 more
wiley   +1 more source

Silica in Protoplanetary Disks

, 2008
Mid-infrared spectra of a few T Tauri stars (TTS) taken with the Infrared Spectrograph (IRS) on board the Spitzer Space Telescope show prominent narrow emission features indicating silica (crystalline silicon dioxide).
A. Li, A. R. Basu, Alexander, Armus, B. A. Sargent, Barkume, Barsony, Benzerara, Binns, Bohren, Bouvier, Bowen, Bowen, Brearley, C. J. Bohac, C. Tayrien, Calvet, Calvet, Chen, Chiar, Cohen, D'Alessio, D'Alessio, D. M. Watson, de Pater, de Zeeuw, Dodd, Dorschner, E. Furlan, Edgar, Emery, Fabian, Furlan, G. C. Sloan, Grün, Hanner, Harker, Harker, Heaney, Hemley, Henning, Herbig, Honda, Houck, J. D. Green, Jaeger, K. H. Kim, Kamp, Kastner, Kemper, Kimura, Klein, Koike, Li, Li, Luhman, Luhman, M. K. McClure, Marshall, Metchev, Mikouchi, Mutschke, Norton, P. Manoj, Palik, Pascucci, Pilipp, Plyusnina, Posch, Prato, Preibisch, Reipurth, Rietmeijer, Rietmeijer, Rietmeijer, Sargent, Schaefer, Silverstone, Tuttle, Uchida, W. J. Forrest, Werner, Wilking   +82 more
core   +1 more source

Characteristics of Ice Nucleating Particles From the Long‐Range Transport of Saharan Dust

Geophysical Research Letters, Volume 52, Issue 11, 16 June 2025.
Abstract Transported mineral dust in a Saharan air layer (SAL) contains active ice‐nucleating particles (INPs) that may be transported across the Atlantic Ocean and subsequently seed clouds in the Caribbean and the Americas. During an aircraft campaign around Houston and the western U.S.
Ryan J. Patnaude, Christina S. McCluskey, Gregory C. Roberts, Paul J. DeMott, Thomas C. J. Hill, Greg M. McFarquhar, Pavlos Kollias, Keyvan Ranjbar, Mengistu Wolde, Sonia M. Kreidenweis   +9 more
wiley   +1 more source

HD 145263: Spectral Observations of Silica Debris Disk Formation via Extreme Space Weathering?

, 2020
We report here time domain infrared spectroscopy and optical photometry of the HD145263 silica-rich circumstellar disk system taken from 2003 through 2014.
Britt, D. T., Chen, C. H., Jackson, A. P., Johnson, B. C., Lisse, C. M., Lucas, M. D., Marengo, M., Meng, H. Y. A., Morlok, A., Sitko, M. L., Vervack Jr., R. J., Wolk, S. J.   +11 more
core   +1 more source

Discovery of Late Holocene‐aged Acropora palmata reefs in Dry Tortugas National Park, Florida, USA: The past as a key to the future?

The Depositional Record, Volume 11, Issue 3, Page 808-828, June 2025.
Emblematic of global coral‐reef ecosystem decline, the coral ecosystem‐engineer Acropora palmata is now rare throughout much of the western Atlantic. We report for the first time, a significant record of late‐Holocene A. palmata populations that existed from ~4500 to 375 years before present in the Dry Tortugas, FL, USA.
Anastasios Stathakopoulos, Lauren T. Toth, Alexander B. Modys, Selena A. Johnson, Ilsa B. Kuffner   +4 more
wiley   +1 more source

Incorporation of H_2 in vitreous silica, qualitative and quantitative determination from Raman and infrared spectroscopy [PDF]

, 1998
Incorporation mechanisms of H_2 in silica glass were studied with Raman and infrared (IR) microspectroscopy. Hydrogenated samples were prepared at temperatures between 800 deg C and 955 deg C at 2 kbar total pressure.
Bény, Jean-Michel, Holtz, François, Schmidt, Burkhard C.   +2 more
core   +2 more sources

Thermochemical Recycling and Degradation Strategies of Halogenated Polymers (F−, Cl−, Br−): A Holistic Review Coupled with Mechanistic Insights

The Chemical Record, Volume 25, Issue 6, June 2025.
This review aims to comprehensively address recent degradation techniques (physical, chemical and biological) of halogenated waste polymers with a prime focus on thermal degradation techniques. Exploiting various metal oxides during co‐pyrolysis is deemed a viable solution for recycling halogenated polymeric waste.
Mohamed Shafi Kuttiyathil, Labeeb Ali, Mohammednoor Altarawneh   +2 more
wiley   +1 more source

A Simple Snowfall Retrieval Algorithm for the GPM Dual‐Frequency Precipitation Radar: Development and Validation With OLYMPEX Campaign Observation

Earth and Space Science, Volume 12, Issue 6, June 2025.
Abstract The current operational algorithm for the Ku‐ and Ka‐band Dual‐frequency Precipitation Radar (DPR) onboard the Global Precipitation Measurement (GPM) satellite, which does not effectively utilize Ka‐band radar, underestimates snowfall amount.
S. Akiyama, S. Shige, K. Aonashi, T. Iguchi   +3 more
wiley   +1 more source

Self-consistent 2-phase AGN torus models: SED library for observers [PDF]

, 2015
We assume that dust near active galactic nuclei (AGN) is distributed in a torus-like geometry, which may be described by a clumpy medium or a homogeneous disk or as a combination of the two (i.e. a 2-phase medium).
Efstathiou, Andreas, Heymann, Frank, Siebenmorgen, Ralf   +2 more
core   +2 more sources

PM2.5 Forecasting at U.S. Embassies and Consulates Worldwide Using NASA Model Powered by Machine Learning

Earth and Space Science, Volume 12, Issue 6, June 2025.
Abstract Air quality forecasting is crucial for public health, especially in rural, suburban, and developing areas lacking reliable monitoring data. Hybrid monitoring (surface, satellite, and models) offers a scalable, cost‐effective solution for tracking pollution and trends.
Junhyeon Seo, Alqamah Sayeed, Seohui Park, John Kerekes, Stephanie M. Christel, Mary T. Tran, Pawan Gupta   +6 more
wiley   +1 more source