Results 1 to 10 of about 15,414 (179)

Theory and generation of heterogeneous 2D arrays of optical vortices by using 2D fork-shaped gratings: topological charge and power sharing management

open access: yesOptics Express, 2023
In this work, by providing comprehensive theoretical foundations, we revisit and improve a simple and efficient method that has been used for generation of 2D orthogonal arrays of optical vortices with components having different topological charges (TCs).
Ali Mohammad Khazaei   +2 more
openaire   +2 more sources

Habitat Shape, Species Invasions, and Reserve Design: Insights from Simple Models

open access: yesEcology and Society, 2002
Species invasions have become a major threat to global biodiversity. We currently lack a general theory of species invasions that allows us to make useful predictions about when and where invasions will occur, whether they will be successful, and whether
Graeme Cumming
doaj   +1 more source

Mathematics, Science, And Cultural Change

open access: yesThe Proceedings of the Nigerian Academy of Science, 2017
According to Roger Bacon (1214-1294), “Mathematics is the gate and key of the sciences. Neglect of Mathematics works injury to all knowledge, since he who is ignorant of it cannot know the other sciences or things of this world, and what is worse, men ...
Sunday O. Iyahen
doaj   +1 more source

Event-Based Time Varying Formation Control for Multiple Quadrotor UAVs with Markovian Switching Topologies

open access: yesComplexity, 2018
Time varying formation control problem for a group of quadrotor unmanned aerial vehicles (UAVs) under Markovian switching topologies is investigated through a modified dynamic event-triggered control protocol.
Zhen Zhou, Hongbin Wang, Zhongquan Hu
doaj   +1 more source

Topologies on groups related to the theory of shape and generalized coverings

open access: yes, 2016
El presente trabajo consiste en dos partes diferenciadas: la principal de ellas (Cap tulos 1 y 2) est a dedicada a introducir estructura adicional en grupos que aparecen de manera natural en el contexto de la teor a de la forma. En la segunda parte (Cap tulo 3), se plantea c omo generalizar la teor a de espacios recubridores y, en particular, se ...
openaire   +1 more source

Topology-Dependent Coke Formation in the Catalytic Pyrolysis of Phenol Over HFAU and HZSM-5 Zeolites. [PDF]

open access: yesAngew Chem Int Ed Engl
Fischer JWA   +6 more
europepmc   +1 more source

Topological data analysis and topological deep learning beyond persistent homology: a review. [PDF]

open access: yesArtif Intell Rev
Su Z   +7 more
europepmc   +1 more source

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