Results 51 to 60 of about 1,505,110 (342)
Periodic table for topological insulators and superconductors [PDF]
, 2009 Gapped phases of noninteracting fermions, with and without charge conservation and time-reversal symmetry, are classified using Bott periodicity. The symmetry and spatial dimension determines a general universality class, which corresponds to one of the ...
A. Kitaev
semanticscholar +1 more source
The census of non-radial pulsation in first-overtone RR Lyrae stars of the OGLE Galactic bulge collection [PDF]
Monthly Notices of the Royal Astronomical Society, 2019, Volume
487, Issue 4, p. 5584-5592, 2019 We analyzed photometry for the up-to-date collection of the first-overtone RR Lyrae stars (RRc; 11415 stars) and double-mode RR Lyrae stars (RRd; 148 stars) towards the Galactic bulge from the Optical Gravitational Lensing Experiment. We analyzed frequency spectra of these stars in search for additional, low-amplitude signals, beyond the radial modes ...
arxiv +1 more source
Examination of the preservice chemistry teachers’ understanding of periodic table concepts
SHS Web of Conferences, 2018 The purpose of this study was to examine the preservice chemistry teachers’ understanding of periodic table concepts and some atomic properties. The study group of this study was comprised of 17 preservice chemistry teachers who were undergraduate ...
Şen Şenol
doaj +1 more source
Irreducible Representations of Diperiodic Groups [PDF]
J.Phys A 31 (1998) 3625-3648, 1998 The irreducible representations of all of the 80 diperiodic groups, being the symmetries of the systems translationally periodical in two directions, are calculated. To this end, each of these groups is factorized as the product of a generalized translational group and an axial point group.
arxiv +1 more source
Molecules, 2022 The current discussion on whether scandium, yttrium and lanthanum should represent Group 3 in the Periodic Table or whether lutetium should replace lanthanum in the group has prompted us to further explore the structural chemistry of the Group 3 elements
Simon A. Cotton +4 more
doaj +1 more source
LASER ELEMENTAL ANALYZER LASER-Z FOR SOILS, ORES, MINERALS AND MINING AND CHEMICAL RAW MATERIAL [PDF]
Минералогия, 2016 SciAsp Company, a leading world producer of portable analytical equipment, presents new series of laser analyzers Laser-Z. Portable mining and geological analyzers Laser-Z will perform field elemental analysis for almost any group of the Periodic Table.
E. Skorina
doaj
On the Importance of σ–Hole Interactions in Crystal Structures
Crystals, 2021 Elements from groups 14–18 and periods 3–6 commonly behave as Lewis acids, which are involved in directional noncovalent interactions (NCI) with electron-rich species (lone pair donors), π systems (aromatic rings, triple and double bonds) as well as ...
Antonio Frontera, Antonio Bauzá
doaj +1 more source
Index of Dirac operators and classification of topological insulators [PDF]
J. Phys. Commun. 1 (2017) 035001, 2017 Real and complex Clifford bundles and Dirac operators defined on them are considered. By using the index theorems of Dirac operators, table of topological invariants is constructed from the Clifford chessboard. Through the relations between K-theory groups, Grothendieck groups and symmetric spaces, the periodic table of topological insulators and ...
arxiv +1 more source
Alchemical and structural distribution based representation for improved QML
, 2017 We introduce a representation of any atom in any chemical environment for the generation of efficient quantum machine learning (QML) models of common electronic ground-state properties.
Christensen, Anders S. +3 more
core +3 more sources
Matere Bonds in Technetium Compounds: CSD Survey and Theoretical Considerations
Crystals, 2023 Noncovalent interactions involving metals as electron acceptors are continuously under investigation. The term “matere bond” has been proposed to identify noncovalent donor–acceptor interactions where elements of group 7 of the periodic table play the ...
Sergi Burguera +3 more
doaj +1 more source