scholarly journals Validation of a Mathematical Model for Green Algae (Raphidocelis Subcapitata) Growth and Implications for a Coupled Dynamical System with Daphnia Magna

2016 ◽  
Vol 6 (5) ◽  
pp. 155 ◽  
Author(s):  
Michael Stemkovski ◽  
Robert Baraldi ◽  
Kevin Flores ◽  
H.T. Banks
Keyword(s):  
Dynamical System ◽  
Mathematical Model ◽  
Daphnia Magna ◽  
Green Algae ◽  
Raphidocelis Subcapitata ◽  
Coupled Dynamical System

scholarly journals The synchronization of coupled stochastic systems driven by symmetric α-stable process and Brownian motion

Filomat ◽  
2018 ◽  
Vol 32 (6) ◽  
pp. 2219-2245
Author(s):  
Shahad Al-Azzawi ◽  
Jicheng Liu ◽  
Xianming Liu
Keyword(s):  
Dynamical System ◽  
Mathematical Model ◽  
Brownian Motion ◽  
Gaussian Noise ◽  
Stochastic Systems ◽  
Stable Process ◽  
Symmetric Stable Process ◽  
And Brownian Motion ◽  
Coupled Dynamical System ◽  
Non Gaussian

The synchronization of stochastic differential equations (SDEs) driven by symmetric ?-stable process and Brownian Motion is investigated in pathwise sense. This coupled dynamical system is a new mathematical model, where one of the systems is driven by Gaussian noise, another one is driven by non- Gaussian noise. In this paper, we prove that the synchronization still persists for this coupled dynamical system. Examples and simulations are given.

scholarly journals Aquatic Toxicity Comparison of Silver Nanoparticles and Silver Nanowires

2015 ◽  
Vol 2015 ◽  
pp. 1-12 ◽  
Author(s):  
Eun Kyung Sohn ◽  
Seyed Ali Johari ◽  
Tae Gyu Kim ◽  
Jin Kwon Kim ◽  
Ellen Kim ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Daphnia Magna ◽  
Silver Nanowires ◽  
Aquatic Toxicity ◽  
Oryzias Latipes ◽  
Aquatic Environments ◽  
Silver Nanomaterials ◽  
Raphidocelis Subcapitata ◽  
Test Organisms ◽  
Test Fish

To better understand the potential ecotoxicological impact of silver nanoparticles (AgNPs) and silver nanowires (AgNWs) released into freshwater environments, the toxicities of these nanomaterials were assessed and compared using Organization for Economic Cooperation and Development (OECD) test guidelines, including a “Daphniasp., acute immobilization test,” “Fish, acute toxicity test,” and “freshwater alga and cyanobacteria, growth inhibition test.” Based on the estimated median lethal/effective concentrations of AgNPs and AgNWs, the susceptibility to the nanomaterials was different among test organisms (daphnia > algae > fish), suggesting that the AgNPs are classified as “category acute 1” forDaphnia magna, “category acute 2” forOryzias latipes, and “category acute 1” forRaphidocelis subcapitata, while the AgNWs are classified as “category acute 1” forDaphnia magna, “category acute 2” forOryzias latipes, and “category acute 2” forRaphidocelis subcapitata, according to the GHS (Globally Harmonized System of Classification and Labelling of Chemicals). In conclusion, the present results suggest that more attention should be paid to prevent the accidental or intentional release of silver nanomaterials into freshwater aquatic environments.

Toxicity prediction and assessment of an environmentally realistic pesticide mixture to Daphnia magna and Raphidocelis subcapitata

Ecotoxicology ◽  
2018 ◽  
Vol 27 (7) ◽  
pp. 956-967 ◽  
Author(s):  
E. Silva ◽  
C. Martins ◽  
A. S. Pereira ◽  
S. Loureiro ◽  
M. J. Cerejeira
Keyword(s):  
Daphnia Magna ◽  
Toxicity Prediction ◽  
Pesticide Mixture ◽  
Raphidocelis Subcapitata

Aquatic toxicity of several textile dye formulations: Acute and chronic assays with Daphnia magna and Raphidocelis subcapitata

2017 ◽  
Vol 144 ◽  
pp. 79-87 ◽  
Author(s):  
Roberta Croce ◽  
Filippo Cinà ◽  
Anna Lombardo ◽  
Gregory Crispeyn ◽  
Claudia Ileana Cappelli ◽  
...  
Keyword(s):  
Daphnia Magna ◽  
Aquatic Toxicity ◽  
Textile Dye ◽  
Raphidocelis Subcapitata

Fuzzy Approximation by a Novel Levenberg–Marquardt Method for Two-Degree-of-Freedom Hypersonic Flutter Model

2014 ◽  
Vol 136 (4) ◽  
Author(s):  
Y. H. Wang ◽  
L. Zhu ◽  
Q. X. Wu ◽  
C. S. Jiang
Keyword(s):  
Dynamical System ◽  
Mathematical Model ◽  
Approximation Scheme ◽  
Degree Of Freedom ◽  
Human Knowledge ◽  
Marquardt Method ◽  
Fuzzy Approximation ◽  
Levenberg Marquardt ◽  
Modification Factor ◽  
Two Degree Of Freedom

The two-degree-of-freedom (2DOF) hypersonic flutter dynamical system has strong aeroelastic nonlinearities, and it is very difficult to obtain a more precise mathematical model. By considering varying learning rate and σ-modification factor, a novel Levenberg– Marquardt (L–M) method is proposed, based on which, an online fuzzy approximation scheme for 2DOF hypersonic flutter model is established without any human knowledge. Compared with the standard L–M method, the proposed method can obtain faster converge speed and avoid parameter drift. Numerical simulations approve the advantages of the proposed scheme.

scholarly journals Causality Analysis: Identifying the Leading Element in a Coupled Dynamical System

PLoS ONE ◽  
2015 ◽  
Vol 10 (6) ◽  
pp. e0131226 ◽  
Author(s):  
Amir E. BozorgMagham ◽  
Safa Motesharrei ◽  
Stephen G. Penny ◽  
Eugenia Kalnay
Keyword(s):  
Dynamical System ◽  
Causality Analysis ◽  
Coupled Dynamical System

scholarly journals New Chaotic Oscillator Derived from Class C Single Transistor-Based Amplifier

2020 ◽  
Vol 2020 ◽  
pp. 1-18
Author(s):  
Jiri Petrzela
Keyword(s):  
Dynamical System ◽  
Mathematical Model ◽  
High Frequency ◽  
Piecewise Linear ◽  
Chaotic Oscillator ◽  
Chaotic Dynamical System ◽  
Transient Behaviour ◽  
Local Polynomial ◽  
Good Accordance ◽  
Class C

This paper describes a new autonomous deterministic chaotic dynamical system having a single unstable saddle-spiral fixed point. A mathematical model originates in the fundamental structure of the class C amplifier. Evolution of robust strange attractors is conditioned by a bilateral nature of bipolar transistor with local polynomial or piecewise linear feedforward transconductance and high frequency of operation. Numerical analysis is supported by experimental verification and both results prove that chaos is neither a numerical artifact nor a long transient behaviour. Also, good accordance between theory and measurement has been observed.

Ecotoxicological study of six drugs in Aliivibrio fischeri, Daphnia magna and Raphidocelis subcapitata

2020 ◽  
Vol 27 (9) ◽  
pp. 9891-9900
Author(s):  
Laura Lomba ◽  
David Lapeña ◽  
Natalia Ros ◽  
Elena Aso ◽  
Mariachiara Cannavò ◽  
...  
Keyword(s):  
Daphnia Magna ◽  
Raphidocelis Subcapitata ◽  
Aliivibrio Fischeri ◽  
Ecotoxicological Study
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