Results 31 to 40 of about 645,313 (258)

The relations among invariants of points on the projective line [PDF]

open access: yes, 2009
We consider the ring of invariants of n points on the projective line. The space (P^1)^n // PGL_2 is perhaps the first nontrivial example of a Geometry Invariant Theory quotient. The construction depends on the weighting of the n points. Kempe discovered
Howard, Ben   +3 more
core   +4 more sources

Plasmon-induced transparency in ring-bar meta-atom

open access: yesAIP Advances, 2018
We introduce an approach for constructing a scalable metamaterial structure, which is composed of a ring and a bar in a unit cell, and supports singular plasmon-induced transparency. The composite multilayered structure consists of coupled meta-atom with
Wan-Xia Huang   +5 more
doaj   +1 more source

Coupled cell networks: Boolean perspective

open access: yesBiomath, 2017
During the 1980s and early 1990s, Martin Golubitsky and Ian Stewart  formulated and developed a theory of "coupled cell networks" (CCNs). Their research was primarily focused onquadrupeds' gaits and they applied the framework of differential equations ...
Katarzyna Swirydowicz
doaj   +1 more source

Product structure of heat phase space and branching Brownian motion

open access: yes, 2003
A generical formalism for the discussion of Brownian processes with non-constant particle number is developed, based on the observation that the phase space of heat possesses a product structure that can be encoded in a commutative unit ring.
Athreya   +15 more
core   +2 more sources

Completions of Z/(p)-Tate cohomology of periodic spectra [PDF]

open access: yes, 1998
We construct splittings of some completions of the Z/(p)-Tate cohomology of E(n) and some related spectra. In particular, we split (a completion of) tE(n) as a (completion of) a wedge of E(n-1)'s as a spectrum, where t is shorthand for the fixed points ...
G G G Ggg   +4 more
core   +4 more sources

Precise Design and Deliberate Tuning of Turn-On Fluorescence in Tetraphenylpyrazine-Based Metal−Organic Frameworks

open access: yesResearch, 2022
The manipulation on turn-on fluorescence in solid state materials attracts increasing interests owing to their widespread applications. Herein we report how the nonradiative pathways of tetraphenylpyrazine (TPP) units in metal−organic frameworks (MOFs ...
He-Qi Zheng   +6 more
doaj   +1 more source

Semilattices of finitely generated ideals of exchange rings with finite stable rank

open access: yes, 2004
We find a distributive (v, 0, 1)-semilattice S of size $ aleph\_1$ that is not isomorphic to the maximal semilattice quotient of any Riesz monoid endowed with an order-unit of finite stable rank.
Wehrung, Friedrich
core   +5 more sources

Ring opening of 2-aza-3-borabicyclo[2.2.0]hex-5-ene, the Dewar form of 1,2-dihydro-1,2-azaborine: stepwise versus concerted mechanisms

open access: yesBeilstein Journal of Organic Chemistry, 2013
The ring opening of the Dewar form of 1,2-dihydro-1,2-azaborine, 2-aza-3-borabicyclo[2.2.0]hex-5-ene (3) is investigated by theoretical methods by using multiconfiguration SCF (CASSCF) and coupled cluster theory [CCSD(T)] with basis sets up to polarised ...
Holger F. Bettinger, Otto Hauler
doaj   +1 more source

Crystal structure, Hirshfeld surface analysis and DFT study of (2Z)-2-(2,4-dichlorobenzylidene)-4-[2-(2-oxo-1,3-oxazolidin-3-yl)ethyl]-3,4-dihydro-2H-1,4-benzothiazin-3-one

open access: yesActa Crystallographica Section E: Crystallographic Communications, 2019
The title compound, C20H16Cl2N2O3S, is built up from a dihydrobenzothiazine moiety linked by –CH– and –C2H4– units to 2,4-dichlorophenyl and 2-oxo-1,3-oxazolidine substituents, where the oxazole ring and the heterocyclic portion of the ...
Brahim Hni   +6 more
doaj   +1 more source

Lifting defects for nonstable K_0-theory of exchange rings and C*-algebras

open access: yes, 2011
The assignment (nonstable K_0-theory), that to a ring R associates the monoid V(R) of Murray-von Neumann equivalence classes of idempotent infinite matrices with only finitely nonzero entries over R, extends naturally to a functor. We prove the following
B Blackadar   +28 more
core   +4 more sources

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