Results 81 to 90 of about 245,319 (342)
Comparative study on zinc oxide nanocrystals synthesized by two precipitation methods
CerâmicaZinc oxide nanocrystals were synthesized by two precipitation methods successfully. The nanocrystals prepared via method I (zinc acetate dihydrate precipitation with KOH) were smaller in crystallite size (~20 nm) as compared to method II (zinc nitrate ...
M. R. Bodke, Y. Purushotham, B. N. Dole
doaj +1 more source
Reconstructing Redshift Distributions with Cross-Correlations: Tests and an Optimized Recipe [PDF]
The Astrophysical Journal, 721:456-468, 2010, 2010 Many of the cosmological tests to be performed by planned dark energy experiments will require extremely well-characterized photometric redshift measurements. Current estimates are that the true mean redshift of the objects in each photo-z bin must be known to better than 0.002(1+z) if errors in cosmological measurements are not to be degraded.
arxiv +1 more source
Redshift Drift in LTB Void Universes
, 2010 We study the redshift drift, i.e., the time derivative of the cosmological redshift in the Lema\^itre-Tolman-Bondi (LTB) solution in which the observer is assumed to be located at the symmetry center.
A. Balbi +9 more
core +1 more source
Redshifted 21 Centimeter Signatures around the Highest Redshift Quasars [PDF]
The Astrophysical Journal, 2004 11 pages, 6 figures.
Wyithe, J. Stuart B., Loeb, Abraham
openaire +5 more sources
Advanced Functional Materials, EarlyView.This study presents a method to create atomically flat dielectric patterns of SiO2 and AlOx for MoSe2 monolayers, forming lateral heterojunctions with minimal strain. The dielectric pattern modulates excitonic properties, contact potential, and carrier dynamics, demonstrating a tunable approach for enhancing the optoelectronic properties of 2D ...
Philipp Moser +11 more
wiley +1 more source
The Radio-to-Submillimeter Flux Density Ratio of Galaxies as a Measure of Redshift [PDF]
, 2000 We re-examine the technique of determining the redshifts of galaxies from the ratio of the submillimeter-to-radio continuum flux densities based on a recently published catalog of 850~$\mu$m sources.
Bertoldi, Scott, Siebenmorgen
core +3 more sources
Advanced Functional Materials, EarlyView.This research utilizes selective reduction laser sintering (SRLS) to engineer In2O3 NPs for flexible NO2 sensors. The introduction of oxygen vacancy defects enhances sensor performance, offering excellent responsiveness, rapid response/recovery, superior selectivity, low detection limit, and long‐term stability.
Shaogang Wang +8 more
wiley +1 more source
RAiSERed: radio continuum redshifts for lobed AGNs [PDF]
, 2020 Next-generation radio surveys are expected to detect tens of millions of active galactic nuclei (AGN) with a median redshift of z > 1. Beyond targeted surveys, the vast majority of these objects will not have spectroscopic redshifts, whilst photometric redshifts for high-redshift AGNs are of limited quality, and even then require optical and infrared ...
arxiv +1 more source
Lower bounds on photometric redshift errors from Type Ia supernovae templates [PDF]
, 2009 Cosmology with Type Ia supernovae heretofore has required extensive spectroscopic follow-up to establish a redshift. Though tolerable at the present discovery rate, the next generation of ground-based all-sky survey instruments will render this approach ...
Asztalos +20 more
core +3 more sources
Cosmology at low redshifts [PDF]
Astronomy & Astrophysics, 2003 PDF file 294KB Astronomy & Astrophysics 2003, In ...
openaire +4 more sources