Results 21 to 30 of about 97,544 (318)

Query-sensitive similarity measure for content-based image retrieval using meta-heuristic algorithm

open access: yesJournal of King Saud University: Computer and Information Sciences, 2018
Content based image retrieval (CBIR) systems retrieve images linked to the query image (QI) from enormous databases. The feature sets extracted by the present CBIR systems are limited. This limits the systems’ effectiveness.
Mutasem K. Alsmadi
doaj   +1 more source

Trees and the dynamics of polynomials [PDF]

open access: yes, 2008
The basin of infinity of a polynomial map $f : {\bf C} \arrow {\bf C}$ carries a natural foliation and a flat metric with singularities, making it into a metrized Riemann surface $X(f)$.
DeMarco, Laura G., McMullen, Curtis T.
core   +4 more sources

How tropical are seven- and eight-particle amplitudes?

open access: yesJournal of High Energy Physics, 2020
We study tropical Grassmanians Tr(k, n) in relation to cluster algebras, and assess their applicability to n-particle amplitudes for n = 7, 8. In N $$ \mathcal{N} $$ = 4 super Yang-Mills theory, we first show that while the totally positive part of Tr(4,
Niklas Henke, Georgios Papathanasiou
doaj   +1 more source

Iterated limits for aggregation of randomized INAR(1) processes with Poisson innovations [PDF]

open access: yes, 2016
We discuss joint temporal and contemporaneous aggregation of $N$ independent copies of strictly stationary INteger-valued AutoRegressive processes of order 1 (INAR(1)) with random coefficient $\alpha\in(0,1)$ and with idiosyncratic Poisson innovations ...
Barczy, Matyas   +2 more
core   +2 more sources

From set-valued dynamical processes to fractals [PDF]

open access: yesOpuscula Mathematica
We present a general theory of topological semiattractors and attractors for set-valued semigroups. Our results extend and unify those previously obtained by Lasota and Myjak.
Grzegorz Guzik, Grzegorz Kleszcz
doaj   +1 more source

Moving Target Detection in Multi-Static GNSS-Based Passive Radar Based on Multi-Bernoulli Filter

open access: yesRemote Sensing, 2020
Over the past few years, the global navigation satellite system (GNSS)-based passive radar (GBPR) has attracted more and more attention and has developed very quickly. However, the low power level of GNSS signal limits its application.
HongCheng Zeng   +5 more
doaj   +1 more source

On iterated inverse limits

open access: yesTopology and its Applications, 2002
Let a compact Hausdorff space X be the limit of a cofinite inverse system of compact Hausdorff spaces Xλ, X=limλXλ. Then it is possible to express every Xλ as the limit of an inverse system of compact polyhedra Yλμ, Xλ=limμYλμ, in such a way that the spaces Yν=Yλμ can be organized in an inverse system with limνYν=limλ limμYλμ.
Mardešić, Sibe, Uglešić, Nikica
openaire   +2 more sources

U.S. ITER Limiter Module Design [PDF]

open access: yesFusion Technology, 1996
The recent U.S. effort on the ITER (International Thermonuclear Experimental Reactor) shield has been focused on the limiter module design. This is a multi-disciplinary effort that covers design layout, fabrication, thermal hydraulics, materials evaluation, thermo- mechanical response, and predicted response during off-normal events.
R.F. Mattas   +10 more
openaire   +1 more source

Modelling pandemic behaviour using an economic multiplayer game

open access: yesScientific Reports, 2022
During a pandemic, isolating oneself from the community limits viral transmission and helps avoid repeated societal lockdowns. This entails a social dilemma—either distance oneself from others for the benefit of the public good or free-ride and enjoy the
Simon T. van Baal   +2 more
doaj   +1 more source

Adaptive Singular Evolutive Interpolated Kalman filter and its application to data assimilation in 2D Water pollution model

open access: yesVietnam Journal of Mechanics, 2022
This study promotes a new algorithm for estimating the water pollution propagation with the primary goal of providing more reliable and high quality estimates to decision makers.
Tran Thu Ha   +2 more
doaj   +1 more source

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