Results 61 to 70 of about 5,753 (177)

Determination of 10 Trace Impurity Elements in Titanium and Titanium Alloys with DC Arc Atomic Emission Spectrometry

Yankuang ceshi, 2014
High purity titanium and titanium alloy have good plasticity, but with the presence of impurity, their performance will become brittle and hard. The accurate quantitative analysis of impurity elements is useful for carrying on the quality control of ...
WANG Hui, MA Xiao-min, ZHENG Wei, WANG Kuan   +3 more
doaj   +2 more sources

Parallel evolution of integrated craniofacial traits in trophic specialist pupfishes

Ecology and Evolution, Volume 14, Issue 7, July 2024.
Here, we mapped the genetic basis of 30 craniofacial and skeletal traits in two independent lake populations of novel trophic specialist pupfishes endemic to San Salvador Island in the Bahamas. These ecomorphs are scale‐eating and molluscivore specialists, respectively, with parallel phenotypes across several lake populations on the island.
Michelle E. St. John, Julia C. Dunker, Emilie J. Richards, Stephanie Romero, Christopher H. Martin   +4 more
wiley   +1 more source

CAFE: Calar Alto Fiber-fed Echelle spectrograph

, 2013
We present here CAFE, the Calar Alto Fiber-fed Echelle spectrograph, a new instrument built at the Centro Astronomico Hispano Alem\'an (CAHA). CAFE is a single fiber, high-resolution ($R\sim$70000) spectrograph, covering the wavelength range between 3650-
Aceituno, J., Barrado, D., Bean, J., Benitez, D., Dreizler, S., Grupp, F., Hernan-Obispo, M., Lillo, J., Montoya, L. M., Pedraz, S., Sanchez, S. F., Thiele, U.   +11 more
core   +1 more source

An Empirical Predictive Model for Atmospheric H Lyman‐α Emission Brightness at Mars

Earth and Space Science, Volume 11, Issue 6, June 2024.
Abstract Characterizing the abundance of atmospheric hydrogen (H) at Mars is critical for determining the current and, subsequently, the primordial water content on the planet. At present, the atmospheric abundance of Martian H is not directly measured but is simulated using proprietary models that are constrained with observations of H Lyman‐α ...
Majd Mayyasi, Adil Mayyasi
wiley   +1 more source

An Optical Study of Stellar and Interstellar Environments of Seven Luminous and Ultraluminous X-Ray Sources [PDF]

, 2005
We have studied the stellar and interstellar environments of two luminous X-ray sources and five ultraluminous X-ray sources (ULXs) in order to gain insight into their nature.
Brandt W. N., Bullejos A., C.‐H. Rosie Chen, Caitlin J. Ramsey, Feast M., Pakull M. W., Q. Daniel Wang, Robert A. Gruendl, Rosa M. Williams, You‐Hua Chu   +9 more
core   +7 more sources

Native fish translocations mediated by anthropogenic drainage modifications in southern New Zealand

New Zealand Journal of Zoology, Volume 51, Issue 1, Page 1-13, March 2024.
ABSTRACT Freshwater‐limited fish populations are often tightly constrained by river drainage boundaries. As a case in point, the distribution of lineages within New Zealand’s diverse Galaxias vulgaris complex is broadly structured by geographic barriers, reflecting tectonic processes.
Jonathan M. Waters, Ciaran S. M. Campbell, Dave Craw   +2 more
wiley   +1 more source

Resolving Red Giant Winds with the Hubble Space Telescope

The Astrophysical Journal
We describe recent spectroscopic observations of red giant stars made by the Space Telescope Imaging Spectrograph (STIS) instrument on board the Hubble Space Telescope, which has provided spatially resolved observations of the warm chromospheric winds ...
Brian E. Wood, Graham M. Harper, Hans-Reinhard Müller   +2 more
doaj   +1 more source

First Daytime Red‐Line Emission Measurements of the Stable Auroral Red (SAR) Arcs

Geophysical Research Letters, Volume 51, Issue 3, 16 February 2024.
Abstract We present the first ground‐based measurements of daytime stable auroral red (SAR) arc using OI 630.0 nm emissions. SAR arc is a direct consequence of heat conduction from the inner‐magnetosphere to the ionospheric regions characterized by increased electron temperatures and low electron density in the region of mid‐latitude trough.
Kshitiz Upadhyay, Duggirala Pallamraju
wiley   +1 more source

The Habitable-Zone Planet Finder: A Stabilized Fiber-Fed NIR Spectrograph for the Hobby-Eberly Telescope

, 2012
We present the scientific motivation and conceptual design for the recently funded Habitable-zone Planet Finder (HPF), a stabilized fiber-fed near-infrared (NIR) spectrograph for the 10 meter class Hobby-Eberly Telescope (HET) that will be capable of ...
Bender, Chad, Burton, Adam, Deshpande, Rohit, Diddams, Scott, Endl, Michael, Halverson, Sam, Hearty, Fred, Kasting, James, Mahadevan, Suvrath, Nelson, Matt, Osterman, Steven, Ramsey, Lawrence, Redman, Stephen, Terrien, Ryan, Wright, Jason T.   +14 more
core   +1 more source

FK Comae Berenices, King of Spin: The COCOA-PUFS Project [PDF]

, 2015
COCOA-PUFS is an energy-diverse, time-domain study of the ultra-fast spinning, heavily spotted, yellow giant FK Com (HD117555; G4 III). This single star is thought to be a recent binary merger, and is exceptionally active by measure of its intense ...
Ayres, Thomas R., Cohen, O., Drake, J. J., Garraffo, C., Granzer, T., Huenemoerder, D., Kashyap, V., Korhonen, H., Saar, S., Strassmeier, K., Testa, P.   +10 more
core   +2 more sources