Results 81 to 90 of about 233,898 (339)
21 cm Tomography of the High-Redshift Universe with the Square Kilometer Array
, 2004 We discuss the prospects for ``tomography'' of the intergalactic medium (IGM) at high redshifts using the 21 cm transition of neutral hydrogen. Existing observational constraints on the epoch of reionization imply a complex ionization history that may ...
Allison +46 more
core +3 more sources
Advanced Optical Materials, EarlyView.Nonlinear optical susceptibilities of five different materials that exhibit the ferroelectric nematic phase, as well as smectic A ferroelectric phase, are determined. The materials investigated include archetypal molecular architectures as well as mixtures showing room‐temperature ferroelectric phases.
Matija Lovšin +7 more
wiley +1 more source
Advanced Optical Materials, EarlyView.This work dissects the ultrafast response of polydisperse plasmonic nanorods using two‐dimensional electronic spectroscopy, uniquely combining temporal and spectral resolution. Our ultrabroadband pulses cover both transverse and longitudinal nanorods’ resonances, revealing sub‐200‐fs dynamics and distinct broadening mechanisms.
Andrea Schirato +8 more
wiley +1 more source
Episodes from the Early History of Astronomy by Asger Aaboe [PDF]
Aestimatio, 2006 John P. Britton
doaj +1 more source
Chandrasekhar and the History of Astronomy [PDF]
Asia Pacific Physics Newsletter, 2011 Chandrasekhar's own books, papers, and oral history interviews make clear that he was generally more interested in the present and future of astrophysics than in its past. Nevertheless, late in his life and after his death, historians of science have somewhat entangled him in two supposedly controversial issues, one concerning precursors of his mass ...
openaire +2 more sources
Institute of Astronomy of Kharkiv V. N. Karazin National University [PDF]
, 2009 In 2008 Ukrainian astronomical community has commemorated 200 anniversary of astronomy in Kharkiv. This brochure is devoted to this anniversary and presents information on the Institute of Astronomy of Kharkiv V. N. Karazin National University.
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core
Optical-Near Infrared Color Gradients of Elliptical Galaxies and Their Environmental Dependence
, 2005 We have studied the environmental effect on optical-NIR color gradients of 273 nearby elliptical galaxies. Color gradient is a good tool to study the evolutionary history of elliptical galaxies, since the steepness of the color gradient reflects merging ...
Im, Myungshin, Ko, Jongwan
core +2 more sources
Advanced Optical Materials, EarlyView.Chiroptical properties of DNA‐stabilized silver nanocluster (DNA)2[Ag16Cl2]8+ are presented in linear and nonlinear regime. These water‐soluble, NIR‐emitting nanoprobes demonstrate exceptionally high two‐photon circular dichroism and circularly polarized luminescence brightness.
Karolina Sulowska +3 more
wiley +1 more source
Star formation across cosmic time with radio surveys. The promise of the SKA [PDF]
, 2018 This lecture briefly reviews the major recent advances in radio astronomy made possible by ultra-deep surveys, reaching microJansky flux density levels.
Bonato, Matteo +2 more
core +1 more source
Excitonic Landscapes in Monolayer Lateral Heterostructures Revealed by Unsupervised Machine Learning
Advanced Optical Materials, EarlyView.Hyperspectral photoluminescence data from graded MoxW1 − xS2 alloys and monolayer MoS2–WS2 lateral heterostructures are analyzed using unsupervised machine learning. The combined use of PCA, t‐SNE, and DBSCAN uncovers distinct excitonic regions that trace how composition, strain, and defects modulate optical responses in these 2D materials.
Maninder Kaur +4 more
wiley +1 more source