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Time-evolution of a caustic [PDF]

open access: yesInternational Journal of Mathematics and Mathematical Sciences, 1988
The Lagrange manifold formalism is adapted to study the time-evolution of caustics associated with high frequency wave propagation in media with both spatial and temporal inhomogenities.
Nasit Ari, Arthur D. Gorman
doaj   +2 more sources

Research on IoT security situation awareness method based on evidence theory

open access: yes网络与信息安全学报, 2022
The security problem of IoT became more and more serious with its rapid development.Considering that the current IoT security situation awareness system lacks generality and excessively relies on expert knowledge, a IoT security situation awareness ...
Jian LI, Tinglu DONG, Jie LI
doaj   +3 more sources

Analysis of the Realities, Evolution and Prospects of Urban Greening from an International Point of View [PDF]

open access: yesAmfiteatru Economic, 2020
There is an increasing concern about the imbalance between urbanisation and environmental conservation, with over half of the world’s population living in urban environments.
Fernando Barriuso , Beatriz Urbano
doaj   +1 more source

Fungal Diversity in the Soil of the Oxytropis glacialis Root System on the Qinghai-Tibet Plateau

open access: yesFrontiers in Microbiology, 2022
Because of swainonine-producing endophytic fungal, Oxytropis glacialis is one of the main poisonous weeds in the alpine grassland and desert grassland of the Qinghai-Tibet Plateau (QTP). It has a severe impact on grassland degradation on the QTP. In this
Peng-xi Cao   +16 more
doaj   +1 more source

The evolution of social timing

open access: yesPhysics of Life Reviews, 2023
Sociality and timing are tightly interrelated in human interaction as seen in turn-taking or synchronised dance movements. Sociality and timing also show in communicative acts of other species that might be pleasurable, but also necessary for survival.
Verga L., Kotz S. A., Ravignani A.
openaire   +4 more sources

Simulation of the First Two Microseconds of an Ar CCP Cold Plasma Discharge by the PIC-MCC Method

open access: yesPlasma, 2022
Most simulations of capacitively coupled radiofrequency cold-plasma discharges (RF-CCP) are focused on the steady state, but the initial discharge time is important for understanding the ignition process and the behavior of pulsed discharges.
Pietro Mandracci
doaj   +1 more source

A time-dependent metric graph with a fourth-order operator on the edges [PDF]

open access: yesTheoretical and Applied Mechanics, 2021
The metric graph model is suggested for description of elastic vibration in a network of rods under the assumption that the rod lengths vary in time. A single rod and star-like graph are considered.
Blinova I.V., Gnedash A.S., Popov I.Y.
doaj   +1 more source

Comparison of Main Covid-19 Outbreaks and Interpretation Based on Age Differences

open access: yesPhysics, 2021
The main scope of this study is a critical comparison of data coming from different regions in the world, where significant outbreaks of the Covid-19 pandemic took place, accounting for age differences among the considered samples.
Federico Nguyen, Andrea Selce
doaj   +1 more source

Effect of debris accumulation on scour evolution at bridge pier in bank proximity

open access: yesJournal of Hydrology and Hydromechanics, 2021
Large debris transported by flood affects scour features at bridge piers and increases the risks of structural failure. Geometric characteristics of the debris and the relative position of the pier with respect to the river bank are important parameters ...
Palermo Michele   +2 more
doaj   +1 more source

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