Results 31 to 40 of about 1,132 (206)
ISM Abundances in Sculptor Group Dwarf Irregular Galaxies
, 2002 Using the CTIO 4-m telescope, we have obtained optical spectra of HII regions in five Sculptor Group dwarf irregular galaxies. We derive oxygen, nitrogen, and sulfur abundances from the HII region spectra. Oxygen abundances are derived via three different methods (the ``direct'' method, the empirical method guided by photoionization modeling of McGaugh
Skillman, Evan D. +2 more
openaire +2 more sources
Molecular Bridges for 2D Nanomaterials
Advanced Functional Materials, EarlyView.Molecular cross‐linking provides a versatile strategy to engineer interfaces in 2D materials. By tuning the linker backbone, binding mode, and interflake spacing, molecular bridges can regulate charge transport, mechanical integrity, chemical functionality, and processing.
Yudhajit Bhattacharjee +3 more
wiley +1 more source
Dependence of Gas Phase Abundances in the ISM on Column Density
, 2000 Sightlines through high- and intermediate-velocity clouds allow measurements of ionic gas phase abundances, A, at very low values of HI column density, N(HI). Present observations cover over 4 orders of magnitude in N(HI). Remarkably, for several ions we find that the A vs N(HI) relation is the same at high and low column density and that the ...
Wakker, B. P., Mathis, J. S.
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ISM chemical abundances in two intermediate-velocity clouds in the line of sight to SN 1987A
The Astronomical Journal, 1988 The earliest IUE high-resolution spectra of SN 1987A have been studied and reveal the presence of several clouds in the line of sight to the LMC. In particular, there are two clouds with radial velocities of about 130 km/s and about 180 km/s. These clouds' velocities are between those of Galactic clouds at 0-80 km/s and those of LMC gas at about 270 km/
Siobahn Morgan, Erika Bohm-Vitense
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Advanced Materials Interfaces, EarlyView.The PTL–CL interface plays a decisive role in PEMWE performance by governing electron conduction, water supply, oxygen removal, catalyst utilization, and interfacial stability. This review summarizes interface‐related resistance sources, characterization methods, and engineering strategies, highlighting rational PTL–CL interface design for low‐cost ...
Aobo Wan, Zhengkai Tu
wiley +1 more source
Carbonaceous dust grains in luminous infrared galaxies [PDF]
Astronomy & Astrophysics, 2007 [Conclusions] These observations further demonstrate the ubiquitousness of a-C:H in the diffuse interstellar medium (DISM) of galaxies, for a long time almost only observed in the Milky-Way ISM lines-of-sights. Whereas PAH emission lines trace the re-processing of energetic young stellar radiation, the observed a-C:H features underline the existence of
Dartois, Emmanuel +1 more
openaire +2 more sources
Advanced Materials Interfaces, EarlyView.This review outlines critical engineering design rules for building artificial protective coatings on next‐generation lithium metal and silicon battery anodes. It highlights how balancing structural flexibility with strict electronic and ionic transport limits prevents early battery failure.
Surin Gupte, Vilas G. Pol
wiley +1 more source
Planetary nebulae in M33: probes of AGB nucleosynthesis and ISM abundances
, 2010 We have obtained deep optical spectrophotometry of 16 planetary nebulae in M33, mostly located in the central two kpc of the galaxy, with the Subaru and Keck telescopes. We have derived electron temperatures and chemical abundances from the detection of the [OIII]4363 line for the whole sample.
Bresolin, Fabio +4 more
openaire +2 more sources
Photoautotrophic organisms control microbial abundance, diversity, and physiology in different types of biological soil crusts [PDF]
The ISME Journal, 2018 AbstractBiological soil crusts (biocrusts) cover about 12% of the Earth’s land masses, thereby providing ecosystem services and affecting biogeochemical fluxes on a global scale. They comprise photoautotrophic cyanobacteria, algae, lichens and mosses, which grow together with heterotrophic microorganisms, forming a model system to study facilitative ...
Stefanie Maier +5 more
openaire +5 more sources
Advanced Materials Technologies, EarlyView.The article overviews past and current efforts on caloric materials and systems, highlighting the contributions of Ames National Laboratory to the field. Solid‐state caloric heat pumping is an innovative method that can be implemented in a wide range of cooling and heating applications.
Agata Czernuszewicz +5 more
wiley +1 more source