Results 41 to 50 of about 5,619,071 (301)
Positive solutions for phi-Laplace equations with discontinuous state-dependent forcing terms
Nonlinear Analysis, 2019 This paper concerns the existence, localization and multiplicity of positive solutions for a φ-Laplacian problem with a perturbed term that may have discontinuities in the state variable. First, the initial discontinuous differential equation is replaced
Radu Precup, Jorge Rodríguez-López
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Pulse vaccination in the periodic infection rate SIR epidemic model
, 2006 A pulse vaccination SIR model with periodic infection rate $\beta (t)$ have been proposed and studied. The basic reproductive number $R_0$ is defined. The dynamical behaviors of the model are analyzed with the help of persistence, bifurcation and global ...
Haque, Mainul, Jin, Zhen, Liu, Quanxing
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Infection Models for Pine Wilt Disease on the Basis of Vector Behaviors
Population Ecology, EarlyView.Infection models for pine wilt disease without vector density were built to estimate the transmission coefficient of the pathogenic nematode. The models successfully simulated the annual change in the density of infected trees for four pine stands. ABSTRACT Pine wilt disease is caused by the pinewood nematode (Bursaphelenchus xylophilus Steiner et ...
Katsumi Togashi
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Global existence of positive and negative solutions for IFDEs via Lyapunov-Razumikhin method
Mathematical Modelling and Control, 2021 This paper considers the global existence of positive and negative solutions for impulsive functional differential equations (IFDEs). First, we introduce the concept of ε-unstability to IFDEs and establish some sufficient conditions to guarantee the ε ...
Xipu Xu
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Population Ecology, EarlyView.Population size and dynamics fundamentally shape speciation by influencing genetic drift, founder events, and adaptive potential. Small populations may speciate rapidly due to stronger drift, whereas large populations harbor more genetic diversity, which can alter divergence trajectories. We highlight theoretical models that incorporate population size
Ryo Yamaguchi +3 more
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Study on the Algorithm of Multifunctional Bone External Fixator
MATEC Web of Conferences, 2015 This paper discussed the problem that parameters of bone external fixator are difficult to calculate in the practical application. Positive solution is described in detail. We used MATLAB software to make simulation experiment.
Chen Jianwen +3 more
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Systems of nonlinear algebraic equations with positive solutions
Journal of Inequalities and Applications, 2017 We are concerned with the positive solutions of an algebraic system depending on a parameter α > 0 $\alpha> 0$ and arising in economics. For α > 1 $\alpha> 1$ we prove that the system has at least a solution.
Anca Ciurte, Sergiu Nedevschi, Ioan Rasa
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Positive solutions of an obstacle problem [PDF]
Annales de la faculté des sciences de Toulouse Mathématiques, 1995 In this paper the author studies the existence of positive solutions of the obstacle problem, with a nonlinear term in the variational inequality. The variational problem is formulated in an exterior domain with a smooth boundary. A positive parameter \(\lambda\) is included in the variational inequality and a discussion is done according to the values
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Evolutionary interplay between viruses and R‐loops
FEBS Letters, EarlyView.Viruses interact with specialized nucleic acid structures called R‐loops to influence host transcription, epigenetic states, latency, and immune evasion. This Perspective examines the roles of R‐loops in viral replication, integration, and silencing, and how viruses co‐opt or avoid these structures.
Zsolt Karányi +4 more
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Journal of Hebei University of Science and Technology, 2016 It is difficult to study the existence of solutions for boundary value problems of differential equations at resonance, moreover, to get positive solutions of boundary value problems for differential equations at resonance is more difficult.
Weihua JIANG, Caixia YANG
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