Results 111 to 120 of about 426,383 (324)

Loop Quantum Gravity Vacuum with Nondegenerate Geometry

open access: yesSymmetry, Integrability and Geometry: Methods and Applications, 2012
In loop quantum gravity, states of the gravitational field turn out to be excitations over a vacuum state that is sharply peaked on a degenerate spatial geometry.
Hanno Sahlmann, Tim Koslowski
doaj   +1 more source

Triangular UHF algebras over arbitrary fields [PDF]

open access: yesProceedings of the American Mathematical Society, 1995
Let K be an arbitrary field. Let ( q n ) ({q_n}) be a sequence of positive integers, and let there be given a family { Ψ n m | n
openaire   +1 more source

Expanding Chemistry of Expanded Helicenes

open access: yesChemistry – A European Journal, EarlyView.
This review presents recent advances in the chemistry of expanded helicenes, defined as helicenes containing linearly fused benzene rings, as novel aromatic compounds. This review begins with a summary of their structural classification, followed by the synthesis, structures, properties, and chiroptical performance of expanded helicenes of various ...
Shinji Toyota
wiley   +1 more source

Bilinear forms over an algebraically closed field

open access: yesJournal of Pure and Applied Algebra, 2001
The general structure theory of bilinear forms, formulated by \textit{C. Riehm} [J. Algebra 31, 45-66 (1974; Zbl 0283.15016)] and \textit{R. Scharlau} [Math. Z. 178, 359-373 (1981; Zbl 0473.10019)], is applied over an algebraically closed field of characteristic \(\neq 2\) to produce explicit representatives for the equivalence classes of forms, or ...
B. Corbas, G. D. Williams
openaire   +2 more sources

An Efficient and Unified Modeling Framework for Trickle Bed Reactors: A Modular Approach

open access: yesChemie Ingenieur Technik, EarlyView.
This review gives an insight in modeling and designing techniques for multiphase catalytic reactors and their associated limitations and potential improvements. To enhance the predictive capabilities and capture events that take place on different scales, a modular approach is proposed.
Vasileios K. Mappas   +4 more
wiley   +1 more source

On semisimple Lie algebras over algebraically closed fields

open access: yesProceedings of the Japan Academy, Series A, Mathematical Sciences, 1984
The author studies so-called standard representatives, and their adjoint actions, of nilpotent classes of a Lie algebra over an algebraically closed field obtained from a Chevalley basis of a complex semisimple Lie algebra; they are a special kind of sums of distinct root vectors from a Chevalley basis.
openaire   +2 more sources

Learning hydrocracking reaction dynamics via neural ODEs: A data‐driven, gradient‐interpretable lumped modelling framework

open access: yesThe Canadian Journal of Chemical Engineering, EarlyView.
This work demonstrates the application of neural ordinary differential equations (neural ODEs) for learning hydrocracking reaction kinetics directly from data, achieving robust predictions under noise and sparsity while preserving mechanistic interpretability through gradient‐based analysis of temperature‐ and concentration‐dependent reaction rates ...
Souvik Ta   +2 more
wiley   +1 more source

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