Results 121 to 130 of about 257,498 (300)

Comparison of Structure and Reactivity of Hydrothermally Prepared Bi−Mo−Co−Fe−O Catalysts in Selective Propylene and Isobutene Oxidation

ChemCatChem, Volume 16, Issue 8, April 22, 2024.
The selective oxidation of lower olefins over bismuth molybdate based multicomponent catalysts are key reactions in chemical industry for the functionalization of hydrocarbons. To understand the catalysts’ working principles, three Bi−Mo−Co−Fe‐oxides were synthesized, tested in the selective oxidation of propylene and isobutene and characterized by ...
Linda Klag, Lorena Baumgarten, Abhijeet Gaur, Thomas L. Sheppard, Jan‐Dierk Grunwaldt   +4 more
wiley   +1 more source

Early reionization by decaying particles and cosmic microwave background radiation

, 2004
We study the reionization scenario in which ionizing UV photons emitted from decaying particle, in addition to usual contributions from stars and quasars, ionize the universe.
A. Sokasian, M. Fukugita, M. Kawasaki, S. Kasuya, U. Seljak   +4 more
core   +1 more source

Cosmic Microwave Background Radiation in the Direction of a Moving Cluster of Galaxies with Hot Gas: Relativistic Corrections

, 1998
It has recently been realized that the relativistic corrections to the spectral distortions of the cosmic microwave background (CMB) measured in the directions of galaxy clusters containing hot gas are significant and should be detectable with ...
Sazonov Sunyaev
semanticscholar   +1 more source

Higgs field and cosmological parameters in the fractal quantum system

EPJ Web of Conferences, 2017
For the fractal model of the Universe the relations of cosmological parameters and the Higgs field are established. Estimates of the critical density, the expansion and speed-up parameters of the Universe (the Hubble constant and the cosmological ...
Abramov Valeriy
doaj   +1 more source

Cosmic 21-cm Fluctuations as a Probe of Fundamental Physics

, 2007
Fluctuations in high-redshift cosmic 21-cm radiation provide a new window for observing unconventional effects of high-energy physics in the primordial spectrum of density perturbations.
Batra P Kleban M, Biswas T, Bousso R, Cooray A, Freivogel B, Hogan C J, Ian Swanson, Kaloper N, Khatri R Wandelt B D, Khoury J, Kolb E W Chung D J H Riotto A, Kris Sigurdson, Lewis A Challinor A, Matthew Kleban, Metcalf R B White S D M, Pillepich A Porciani C Matarrese S, Pritchard J R Furlanetto S R, Scott D, Shchekinov Y A Vasiliev E O, Starobinsky A A, Sunyaev R A, Susskind L, Tanaka T, Wang X M Tegmark M Santos M Knox L   +23 more
core   +1 more source

CMBFSCNN: Cosmic Microwave Background Polarization Foreground Subtraction with a Convolutional Neural Network

The Astrophysical Journal Supplement Series
In our previous study, we introduced a machine learning technique, namely Cosmic Microwave Background Foreground Subtraction with Convolutional Neural Networks ( CMBFSCNN ), for the removal of foreground contamination in cosmic microwave background (CMB)
Ye-Peng Yan, Si-Yu Li, Guo-Jian Wang, Zirui Zhang, Jun-Qing Xia   +4 more
doaj   +1 more source

Gravitational-Wave Cosmology across 29 Decades in Frequency

Physical Review X, 2016
Quantum fluctuations of the gravitational field in the early Universe, amplified by inflation, produce a primordial gravitational-wave background across a broad frequency band.
Paul D. Lasky, Chiara M. F. Mingarelli, Tristan L. Smith, John T. Giblin, Jr., Eric Thrane, Daniel J. Reardon, Robert Caldwell, Matthew Bailes, N. D. Ramesh Bhat, Sarah Burke-Spolaor, Shi Dai, James Dempsey, George Hobbs, Matthew Kerr, Yuri Levin, Richard N. Manchester, Stefan Osłowski, Vikram Ravi, Pablo A. Rosado, Ryan M. Shannon, Renée Spiewak, Willem van Straten, Lawrence Toomey, Jingbo Wang, Linqing Wen, Xiaopeng You, Xingjiang Zhu   +26 more
doaj   +1 more source

The Signature of Proper Motion in the Microwave Sky

, 2010
The cosmic microwave background radiation defines a preferred cosmic rest frame, and inflationary cosmological theories predict that the microwave background temperature fluctuations should be statistically isotropic in this rest frame.
Arthur Kosowsky, O. Lahav, Tina Kahniashvili   +2 more
core   +1 more source

Cosmology from Topological Defects

, 2003
The potential role of cosmic topological defects has raised interest in the astrophysical community for many years now. In this set of notes, we give an introduction to the subject of cosmic topological defects and some of their possible observable ...
Gangui, Alejandro
core   +1 more source

Bayesian Methods for Cosmological Parameter Estimation from Cosmic Microwave Background Measurements [PDF]

arXiv, 2000
We present a strategy for a statistically rigorous Bayesian approach to the problem of determining cosmological parameters from the results of observations of anisotropies in the cosmic microwave radiation background. We propose the application of Markov chain Monte Carlo methods, specifically the Metropolis-Hastings algorithm, to estimate the ...
arxiv