Results 61 to 70 of about 238,136 (265)

NICMOS Kernel-phase Interferometry. II. Demographics of Nearby Brown Dwarfs

The Astronomical Journal, 2023
Star formation theories have struggled to reproduce binary brown dwarf population demographics (e.g., frequency, separation, and mass ratio). Kernel-phase interferometry is sensitive to companions at separations inaccessible to classical imaging ...
Samuel M. Factor, Adam L. Kraus
doaj   +1 more source

T Dwarfs and the Substellar Mass Function. I. Monte Carlo Simulations [PDF]

Astrophys.J.Suppl.155:191-207,2004, 2004
Monte Carlo simulations of the field substellar mass function (MF) are presented. Starting from various representations of the MF below 0.1 M$_{\sun}$ and the stellar birth rate, luminosity functions (LFs) and T$_{eff}$ distributions are produced for comparison with observed samples.
arxiv   +1 more source

Wood Biomolecules as Agricultural Adjuvants for Effective Suppression of Droplet Rebound from Plant Foliage

Advanced Science, EarlyView.
Lignin and hemicellulose are used to develop agricultural adjuvants to decrease agrochemical run‐off from foliage, by suppressing droplet rebound and enhancing adhesion of aqueous solutions on plant leaves. The wood components combine surface activity with surface pinning effects and to improve by tenfold the droplet rebound in citrus leaves ...
Mamata Bhattarai, Hedar Al‐Terke, Kai Liu, Zhangmin Wan, Petri Kilpeläinen, Alistair W. T. King, Alexey Khakalo, Jiayun Xu, Chunlin Xu, Robin H. A. Ras, Bruno D. Mattos, Orlando J. Rojas   +11 more
wiley   +1 more source

High Proton Conductivity in xCuO/(1‐x)CeO2 Electrolytes Induced by CuO Self‐Nucleation and Electron‐Ion Coupling

Advanced Science, EarlyView.
This study discovers electron‐ion (E‐I) coupling in xCuO/(1‐x)CeO2(CCO), (x = 0–0.4) membranes, achieving ionic conductivity >0.15 S cm−1, with activation energy 0.28 eV and generated peak power density 900 mW cm−2 at 550 °C. Interfacial charge distribution and build‐in electric field enhanced ion transport entirely advanced the LT‐SOFC technology for ...
Muhammad Shahid Sharif, Sajid Rauf, Zuhra Tayyab, Muhammad Ahsan Masood, Yibin Tian, Muhammad Ali Kamran Yousaf Shah, Abdullah N. Alodhayb, Rizwan Raza, Bin Zhu   +8 more
wiley   +1 more source

UNCOVER: JWST Spectroscopy of Three Cold Brown Dwarfs at Kiloparsec-scale Distances

The Astrophysical Journal
We report JWST/NIRSpec spectra of three distant T-type brown dwarfs identified in the Ultradeep NIRSpec and NIRCam ObserVations before the Epoch of Reionization (UNCOVER) survey of the Abell 2744 lensing field.
Adam J. Burgasser, Rachel Bezanson, Ivo Labbe, Gabriel Brammer, Sam E. Cutler, Lukas J. Furtak, Jenny E. Greene, Roman Gerasimov, Joel Leja, Richard Pan, Sedona H. Price, Bingjie Wang, John R. Weaver, Katherine E. Whitaker, Seiji Fujimoto, Vasily Kokorev, Pratika Dayal, Themiya Nanayakkara, Christina C. Williams, Danilo Marchesini, Adi Zitrin, Pieter van Dokkum   +21 more
doaj   +1 more source

Photometric Calibrations of M-dwarf Metallicity with Markov Chain Monte Carlo and Bayesian Inference

The Astrophysical Journal, 2023
Knowledge of stellar atmospheric parameters ( T _eff , $\mathrm{log}g$ , [Fe/H]) of M dwarfs can be used to constrain both theoretical stellar models and Galactic chemical evolutionary models, and guide exoplanet searches, but their determination is ...
C. Duque-Arribas, D. Montes, H. M. Tabernero, J. A. Caballero, J. Gorgas, E. Marfil   +5 more
doaj   +1 more source

Binarity at the L/T brown dwarf transition [PDF]

, 2008
Current atmospheric models cannot reproduce some of the characteristics of the transition between the L dwarfs with cloudy atmospheres and the T dwarfs with dust-depleted photospheres. It has been proposed that a majority of the L/T transition brown dwarfs could actually be a combinaison of a cloudy L dwarf and a clear T dwarf. Indeed binarity seems to
arxiv   +1 more source

Resistance Drift of Phase Change Materials Beyond the Power Law

Advanced Electronic Materials, EarlyView.
The timedependent resistance of phase change materials is important for their application as electronic memory. Here, resistance measurements of melt‐quenched germanium telluride from nanoseconds to minutes are presented. By going far beyond the usually considered measurement regime, deviations from the ubiquitous power law behavior are observed, that ...
Jakob Ballmaier, Sebastian Walfort, Martin Salinga   +2 more
wiley   +1 more source

Isotope Techniques in Chemical Wastewater Treatment: Opportunities and Uncertainties

Angewandte Chemie, EarlyView.
In this review, we would first introduce basic knowledge about isotopic compounds and then scrutinize the physical and chemical influence induced by isotope changes. Special attention will be paid to the uncertainties in explaining the isotope results.
Hongyu Zhou, Xiaoguang Duan, Bingkun Huang, Shuang Zhong, Cheng Cheng, Virender K. Sharma, Shaobin Wang, Bo Lai   +7 more
wiley   +2 more sources

Impact of Transition Metals and Electrocatalyst Layer Thickness on the Pt‐Based Cathodes of Proton Exchange Membrane Fuel Cells – Do Multimetallic Electrocatalysts Necessarily Yield an Improved Performance?

Advanced Energy Materials, EarlyView.
Nonnoble transition‐metals (TMs) in PtCuNi/C catalysts have a dual influence in proton‐exchange membrane fuel cell cathode catalyst layer. While TMs act as a “sacrificial component” of PtCuNi/C, inhibiting Pt dissolution from the PtMx nanoparticles bearing the active sites, they promote the formation of separate catalysts and ionomer domains in the ...
Ricardo Sgarbi, William Ait Idir, Quentin Labarde, Camille Jourdin, Vincent Martin, Daniele Andreetta, Peizhe Wu, Enrico Negro, Fabio Bassetto, Julia Mainka, Jérôme Dillet, Clémence Marty, Fabrice Micoud, Vito Di Noto, Pawel Kulesza, Olivier Lottin, Marian Chatenet   +16 more
wiley   +1 more source