Results 31 to 40 of about 294 (151)
Experimental methods in chemical engineering: Atomic absorption spectrometry—AAS
The Canadian Journal of Chemical Engineering, Volume 104, Issue 5, Page 2206-2224, May 2026.Abstract Elements absorb electromagnetic radiation (light) of a specific wavelength in proportion to the number of atoms in its path. As the atoms absorb this light energy, electrons rise from the ground state to an excited state. In atomic absorption spectrometry (AAS), high temperatures produce clouds of atoms from the sample (atomization) and ...
Emily Cintia Tossi de A. Costa +4 more
wiley +1 more source
Journal of Geophysical Research: Planets, Volume 131, Issue 4, April 2026.Abstract We present a new climatology of Martian water vapor column abundance derived from nadir dayside observations made by the Nadir and Occultation for MArs Discovery (NOMAD) instrument suite as part of the ExoMars Trace Gas Orbiter (TGO) mission. H2O vertical column densities are retrieved by applying an Optimal Estimation inversion scheme to the ...
F. Hendrick +16 more
wiley +1 more source
Echelle crossed grating millimeter wave beam scanner
Optics Express, 2014 We present a two-dimensional, active, millimeter-wave, electronic beam scanner, with Doppler capabilities for stand-off imaging. The two-dimensional scan is achieved by mapping the millimeter wave spectrum to space using a pair of crossed gratings. The active transceiver and heterodyne quadrature detection allow the measurement of the relative phase ...
Orges, Furxhi +2 more
openaire +2 more sources
Commissioning an Inexpensive Off‐The‐Shelf Spectrograph for Radial‐Velocity Studies
Astronomische Nachrichten, Volume 347, Issue 2, February 2026.ABSTRACT We present a way to set up an inexpensive out of the shelf spectrograph at a local observatory. Stability and resolution of the spectrograph are high enough for radial velocity determination of binary stars or determination of stellar characteristics. Even some exoplanets might be detectable via the radial velocity method.
Lukas Stock, Andreas Schrimpf
wiley +1 more source
Journal of Geophysical Research: Planets, Volume 131, Issue 2, February 2026.Abstract We present vertical profiles of water vapor obtained during six continuous years of solar occultation observations in the infrared by the Nadir and Occultation for MArs Discovery (NOMAD) instrument on board Trace Gas Orbiter. The retrievals have been performed with an inversion code previously applied to smaller samples of this data set, but ...
A. Brines +20 more
wiley +1 more source
Journal of Geophysical Research: Planets, Volume 131, Issue 2, February 2026.Abstract This is the second part of an investigation of water vapor in the Martian atmosphere using solar occultation observations by the Nadir and Occultation for MArs Discovery (NOMAD) spectrometer on board the ExoMars Trace Gas Orbiter. Following the analysis of six Earth years of NOMAD observations performed in the first part, a cross‐validation ...
A. Brines +19 more
wiley +1 more source
New Phytologist, Volume 249, Issue 1, Page 448-459, January 2026.Summary Mycorrhizal associations between fungi and plants are a fundamental aspect of terrestrial ecosystems. Mycorrhizas occur in c. 85% of extant plants, yet their geological record remains sparse. Rare fossil evidence from early terrestrial environments offers crucial insights into these ancient symbioses, but visualizing fossil fungi at the ...
Christine Strullu‐Derrien +7 more
wiley +1 more source
Archaeology in Oceania, Volume 60, Issue 3, Page 201-219, October 2025.ABSTRACT Rings made on marine shell are a conspicuous artefact form found throughout cultural sequences for much of the Pacific over millennia. Despite their importance in both recent and ancient times, in‐depth consideration of the manufacturing processes involved in shell ring production are limited.
Michelle C. Langley +2 more
wiley +1 more source
Motion Error of V-Type Roller Linear Guides Considering Geometric Errors of the Guide Rails
Applied SciencesV-type roller linear guides can achieve extremely high motion accuracy through precision design and machining; however, theoretical research and methodologies in this field remain limited.
Daowei Zhang +5 more
doaj +1 more source
Unexpected pathway for intercontinental movement into the Nearctic revealed by phylogenetic analyses
Zoologica Scripta, Volume 54, Issue 4, Page 562-574, July 2025.Abstract Much of North America's freshwater biodiversity is derived from Palearctic lineages. Isopods of the Holarctic family Asellidae are among the most widespread and diverse freshwater crustaceans, but Nearctic species are poorly studied. We examined the evolutionary history of the family, utilizing Sanger sequencing of mitochondrial and nuclear ...
Kye Tomoyasu +2 more
wiley +1 more source