Results 71 to 80 of about 6,825 (205)

Complex Variability of the H$\alpha$ Emission Line Profile of the T Tauri Binary System KH 15D: The Influence of Orbital Phase, Occultation by the Circumbinary Disk, and Accretion Phenomenae [PDF]

, 2012
We have obtained 48 high resolution echelle spectra of the pre-main sequence eclipsing binary system KH~15D (V582 Mon, P = 48.37 d, $e$ $\sim$ 0.6, M$_{A}$ = 0.6 M$_{\odot}$, M$_{B}$ = 0.7 M$_{\odot}$). The eclipses are caused by a circumbinary disk seen
Agol, Artymowicz, Barge, Boden, Catrina M. Hamilton, Chiang, Christopher M. Johns-Krull, Deming, Hamilton, Hamilton, Hamilton, Herbst, Hinkle, Jensen, Johnson, Johnson, Johnson, Joshua N. Winn, Kearns, Kusakabe, Mundt, Muzerolle, Muzerolle, Reinhard Mundt, Tokunaga, Valenti, William Herbst, Winn, Winn, Winn   +29 more
core   +3 more sources

Characterization of a Gliding Arc Plasmatron for the Plasma Assisted Pyrolysis of Methane to Acetylene and Hydrogen

Plasma Processes and Polymers, Volume 22, Issue 3, March 2025.
This article explores the innovative use of a gliding arc plasmatron for methane pyrolysis, combining plasma diagnostics and gas stream analysis. By delving into plasma characteristics and the resulting product composition, it unveils the potential and the mechanisms of this technology for efficient hydrogen and acetylene production. ABSTRACT A gliding
Simon Böddeker, Jan Göricke, Bastian Kogelheide, Nikita Bibinov, Maximilian Purcel, Martin Muhler, Thomas Mussenbrock, Peter Awakowicz   +7 more
wiley   +1 more source

Optical design of a multi-resolution, single shot spectrograph

, 2016
Multi-object or integral field spectrographs are recognized techniques for achieving simultaneous spectroscopic observations of different or extended sky objects with a high multiplex factor.
Henault, Francois, Laurent, Florence
core   +1 more source

Development of a spatial heterodyne Raman spectrometer with echelle-mirror structure

Optics Express, 2018
Spatial heterodyne Raman spectroscopy is a spectroscopic detection technique that is particularly suitable for Raman measurements. The spectral range of traditional spatial heterodyne Raman spectrometer (SHRS) is limited by its spectral resolution and the number of detector elements.
Jun Qiu, Xiangdong Qi, Xiaotian Li, Zhenyu Ma, null Jirigalantu, Yuguo Tang, Xiaotao Mi, Xiaoming Zheng, Rui Zhang, null Bayanheshig   +9 more
openaire   +2 more sources

Supported Co‐Based Catalytic Systems for the Epoxidation of Terpenes Using O2 as Oxidant

European Journal of Inorganic Chemistry, Volume 28, Issue 5, February 12, 2025.
Cobalt‐based catalyst supported on SBA‐15, SBA‐16, commercial silica and carbon nanotubes were prepared, characterized and applied in the aerobic oxidation of terpenes. High conversions and selectivities could be achieved and the influence of the support, the nature of the substrate, the cobalt loading were investigated.
Meriem Rais, Jérémy Soulié, Claire Tendero, Jérôme Durand   +3 more
wiley   +1 more source

Venus' O 5577 Å Oxygen Green Line: A Global Diffuse Proton‐Induced Aurora

Journal of Geophysical Research: Space Physics, Volume 130, Issue 2, February 2025.
Abstract The Venusian O(1S–1D) 5577 Å “oxygen green line” has been an enigmatic feature of the Venusian atmosphere since its first attempted observation by the Venera spacecraft. Its first detection in 1999 and subsequent detections point to a unique auroral phenomena.
Candace L. Gray, Kerstin Peter, Martin Pätzold, Silvia Tellmann, Tom Nordheim, Carl Schmidt, Nancy J. Chanover, Paul Withers   +7 more
wiley   +1 more source

Determination of trace elements in titanium oxides by wavelength dispersive x‐ray fluorescence spectrometry (WD‐XRF)

X-Ray Spectrometry, Volume 54, Issue 1, Page 16-25, January/February 2025.
Abstract TiO2 is used in a great variety of industries (foods, medicines, cosmetics, etc.). In food industry, although the use of TiO2 as additive was banned by EU in 2022, it is still authorized in medicinal products, and is allowed as food ingredient in US and Canada.
M. F. Gazulla, M. Orduña, M. Rodrigo
wiley   +1 more source

Discovery of a Nearby Habitable Zone Super-Earth Candidate Amenable to Direct Imaging

The Astronomical Journal
We present the discovery of GJ 251 c, a candidate super-Earth orbiting in the habitable zone (HZ) of its M dwarf host star. Using high-precision Habitable-zone Planet Finder and NEID RVs, in conjunction with archival RVs from the Keck I High Resolution ...
Corey Beard, Paul Robertson, Jack Lubin, Eric B. Ford, Suvrath Mahadevan, Gudmundur Stefansson, Jason T. Wright, Eric Wolf, Vincent Kofman, Vidya Venkatesan, Ravi Kopparapu, Roan Arendtsz, Rae Holcomb, Raquel A. Martinez, Stephanie Sallum, Jacob K. Luhn, Chad F. Bender, Cullen H. Blake, William D. Cochran, Megan Delamer, Scott A. Diddams, Michael Endl, Samuel Halverson, Shubham Kanodia, Daniel M. Krolikowski, Andrea S. J. Lin, Sarah E. Logsdon, Michael W. McElwain, Andrew Monson, Joe P. Ninan, Jayadev Rajagopal, Arpita Roy, Christian Schwab, Ryan C. Terrien   +33 more
doaj   +1 more source

The HARPS-TERRA project I. Description of the algorithms, performance and new measurements on a few remarkable stars observed by HARPS

, 2012
Doppler spectroscopy has uncovered or confirmed all the known planets orbiting nearby stars. Two main techniques are used to obtain precision Doppler measurements at optical wavelengths.
Anglada-Escudé, Guillem, Butler, R. Paul   +1 more
core   +1 more source

Dynamics, Monitoring, and Forecasting of Tephra in the Atmosphere

Reviews of Geophysics, Volume 62, Issue 4, December 2024.
Abstract Explosive volcanic eruptions inject hot mixtures of solid particles (tephra) and gasses into the atmosphere. Entraining ambient air, these mixtures can form plumes rising tens of kilometers until they spread laterally, forming umbrella clouds. While the largest clasts tend to settle in proximity to the volcano, the smallest fragments, commonly
F. Pardini, S. Barsotti, C. Bonadonna, M. de’ Michieli Vitturi, A. Folch, L. Mastin, S. Osores, A. T. Prata   +7 more
wiley   +1 more source