Results 31 to 40 of about 626 (184)

Oases of endemism: Regional aquifer desert springs serve as biodiversity hotspots preserving vulnerable endemic taxa in the Great Basin and Mojave Desert regions

Limnology and Oceanography, Volume 71, Issue 6, June 2026.
Abstract Spring ecosystems in arid regions often serve as crucial biodiversity hotspots by providing some of the only reliable sources of surface water. However, anthropogenic activities and climate change have severely degraded spring ecosystems worldwide, emphasizing the need for large‐scale multidisciplinary studies informing conservation efforts ...
Matthew J. Forrest, Donald W. Sada, Matthew S. Edwards, Robert K. Burton, Richard D. Norris   +4 more
wiley   +1 more source

Nanoscale Ordering of Magnetosomes Under the Influence of a Magnetic Field Investigated by Small‐Angle X‐Ray Scattering

Small Structures, Volume 7, Issue 6, June 2026.
Recently, the synthetic Rhodospirillum rubrum ‘magneticum’ has been shown to enable the light‐driven production of magnetosomes (MAGs) in high yields. These membrane‐enveloped magnetic nanoparticles represent promising alternatives to their chemically synthesized analogs for many applications in the biotechnological and biomedical field.
Dieter Skroblin, Sabine Rosenfeldt, Simon Markert, Jakob J. Beierl, Dirk Schüler, Anna S. Schenk, Frank Mickoleit, Christian Gollwitzer   +7 more
wiley   +1 more source

Static and dynamic strain fiber Bragg grating sensor interrogation using a monolithically integrated echelle diffractive grating

, 2011
We report a miniaturized wavelength interrogator for the static and dynamic strain fiber Bragg grating sensors. The developed interrogator is based on a monolithically integrated echelle diffractive grating and works in two independent modes, one for the
Mrad, N., Jianping Yao, Xiao, G., Gaozhi Xiao, Guo, H., Nezih Mrad, Honglei Guo, Yao, J.   +7 more
core   +1 more source

Large-format X-ray reflection grating operated in an echelle-like mounting

, 2020
We report on resolving power measurements of an X-ray reflection grating designed for use in an astronomical soft X-ray spectrograph. The grating was patterned via electron-beam lithography (EBL) to have fanned grooves to match the convergence of an ...
Hartner, G., Grisé, F., La Caria, M., Burwitz, V., DeRoo, C., McEntaffer, R., Pelliciari, C., Donovan, B., Eichfeld, C.   +8 more
core   +1 more source

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, Jildimara de Jesus Santana, Viviane de Oliveira Campos, Felipe Fernandes Barbosa, Gregory S. Patience   +4 more
wiley   +1 more source

Total internal reflection type echelle grating demultiplexer based on amorphous silicon nanowire platform

, 2008
In this paper we present measurement results of an ultracompact echelle-grating demultiplexer based on silicon-on-insulator nanowire platform, in which we introduced a total internal reflection design of the grating facets to improve the diffraction ...
He, Sailing,, Wosinski, Lech,, Song, Jun,, Zhu, Ning,   +3 more
core   +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, Daniel L, Marks, David J, Brady   +2 more
openaire   +2 more sources

New Climatology of Martian Water Vapor Column Abundance Derived From NOMAD LNO Nadir Observations Over Martian Years 34–38

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, S. Robert, I. Thomas, S. Aoki, F. Daerden, L. Trompet, L. Neary, J. Erwin, Y. Willame, A. Piccialli, Z. Flimon, B. Ristic, M. R. Patel, G. Bellucci, M. A. López‐Valverde, M. D. Smith, A. C. Vandaele   +16 more
wiley   +1 more source

Optical System Design of an Echelle Spectrometer Based on a Digital Micromirror Device

Optics
The echelle spectrometer utilizes an echelle grating as the primary dispersive element, combined with a prism or planar grating for cross-dispersion, to form a two-dimensional spectral image on an area-array Charge-Coupled Device (CCD).
Jia Liu, Ruikai Zhang, Yangdong Zhou, Dewu Li, Yixin Wang, Lu Yin   +5 more
doaj   +1 more source

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