Results 51 to 60 of about 13,731,074 (335)
Population Ecology, EarlyView.We investigate the seasonal dynamics of two freshwater snails, Biomphalaria straminea and Melanoides tuberculata, in artificial reservoirs of the Brazilian semiarid region. Despite regulated hydrology, B. straminea exhibited strong seasonal fluctuations associated with dry periods, while M. tuberculata maintained stable populations throughout the year,
Lucas Henrique Sousa da Silva +6 more
wiley +1 more source
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
doaj +1 more source
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
doaj +1 more source
, 2016 In this paper, by using the Guo-Krasnoselskii theorem, we investigate the existence and nonexistence of positive solutions of a system of integral equation with parameters which can be seen as an effective generalization of various types of systems of ...
Chun-fang Shen, Hui Zhou, Liu Yang
semanticscholar +1 more source
Moving in the Dark: Enlightening the Spatial Population Ecology of European Cave Salamanders
Population Ecology, EarlyView.We assessed individual interactions, movement ecology and activity patterns of a subterranean population of Speleomantes strinatii, applying spatial capture–recapture modeling to a photographic dataset of 104 individuals. ABSTRACT Space use and movement are fundamental aspects of organisms' ecology, mirroring individual fitness, behavior, and life ...
Giacomo Rosa +2 more
wiley +1 more source
Positive solutions for nonlinear elliptic systems
Electronic Journal of Differential Equations, 2012 In this article, we study the existence of positive solutions for the system $$displaylines{ Delta u=H(x,u,v),cr Delta v=K(x,u,v),hbox{in }mathbb{R}^n; (ngeq 3), }$$ where $H,K: mathbb{R}^nimes[0,infty)imes[0,infty)o[0,infty)$ are continuous ...
Adel Ben Dekhil
doaj
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
doaj +1 more source
Positive solution for singular fractional differential equations involving derivatives
, 2016 By using the fixed point theorem for the mixed monotone operator, the existence of unique positive solutions for singular nonlocal boundary value problems of fractional differential equations is established.
Xinan Hao
semanticscholar +1 more source
Harnack type inequality for positive solution of some integral equation [PDF]
, 2012 In this paper, we establish some Harnack type inequalities satisfied by positive solutions of non-local inhomogeneous equations arising in the description of various phenomena ranging from population dynamics to micromagnetism.
J. Coville
semanticscholar +1 more source
Existence of a positive solution for a singular system [PDF]
Proceedings of the Royal Society of Edinburgh: Section A Mathematics, 2010 We show the existence and non-existence of positive solutions to a system of singular elliptic equations with the Dirichlet boundary condition.
Da Silva Montenegro, Marcelo +1 more
openaire +2 more sources