Results 281 to 290 of about 217,698 (308)

A novel EPSO algorithm based on shifted sigmoid function parameters for maximizing the energy yield from photovoltaic arrays: An experimental investigation

Qays Adnan Ali, Mohamed Elsakka, Nikolay Korovkin, Ahmed Refaat   +3 more
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Management and risk factors for colonic volvulus: retrospective national cohort study. [PDF]

BJS Open
Rasilainen S, Aden M, Kivelä AJ, Pakarinen S, Rintala J, Niemeläinen S, Helavirta I, Moilanen S, Mattila A, Pinta T, Saukkonen K, Vento P, Turkka N, Pengermä P, Häggblom J, Scheinin T.   +15 more
europepmc   +1 more source

Radiological diagnosis of gallstone sigmoid ileus or coleus: Case report and literature review. [PDF]

SA J Radiol
Mewa Kinoo S, Naidu V, Maharajh J.
europepmc   +1 more source

Model calibration results for sigmoid functions and population-level behavior.

Zhuolin Qu (21349941), Denis Patterson (16408570), Lihong Zhao (221095), Joan Ponce (11408705), Christina J. Edholm (21349944), Olivia F. Prosper Feldman (21349947), Lauren M. Childs (9425838)   +6 more
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Posterior fossa extradural haematoma with cerebral venous sinus thrombosis precipitates haemophilia a diagnosis: a paediatric case report and literature review. [PDF]

Childs Nerv Syst
Akhbari M, Owen W, Honeyman SI, Badle S, Calisto A.   +4 more
europepmc   +1 more source

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An application of Sigmoid and Double-Sigmoid functions for dynamic policyholder behaviour

Decisions in Economics and Finance, 2020
In the context of risk-based valuation of insurance contracts, the paper provides an extension of the dynamic lapse rate models, proposed in the literature and by regulators, using a double-sigmoid curve. The model is based on an economic assumption, in accordance with the description of policyholder behavior currently well established in the insurance
Baione F., Biancalana D., De Angelis P.
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Approximation of the Heaviside Function by Sigmoidal Functions in Reaction-Diffusion Equations

Communications in Nonlinear Science and Numerical Simulation, 2023
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Wenlong Sun, Xiaoying Han, Peter E. Kloeden   +2 more
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Predator–prey model with sigmoid functional response

Studies in Applied Mathematics, 2023
AbstractThe sigmoid functional response in the predator–prey model was posed in 1977. But its dynamics has not been completely characterized. This paper completes the classification of the global dynamics for the classical predator–prey model with the sigmoid functional response, whose denominator has two different zeros.
Su, Wei, Zhang, Xiang
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Sigmoid functional responses and population stability

Theoretical Population Biology, 1978
Abstract Sigmoid functional responses are known to stabilize the differential Lotka-Volterra predator-prey model. However, we have found that they have no such effect in a comparable discrete generation model. The difficulty in stabilizing this model results from the one-generation time delay between changes in predator population density and the ...
Hassell, M. P., Comins, H. N.
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