Zobrazeno 1 - 10
of 693
pro vyhledávání: '"Polluted environment"'
Autor:
Zeyan Yue, Sheng Wang
Publikováno v:
Mathematical Biosciences and Engineering, Vol 21, Iss 1, Pp 186-213 (2024)
In this paper, a stochastic hybrid delay food chain model with jumps in an impulsive polluted environment is investigated. We obtain the sufficient and necessary conditions for persistence in mean and extinction of each species. The results show that
Externí odkaz:
https://doaj.org/article/d4d894e6f9db46e0943edfb89cab4bb0
Autor:
Simon Zawka, P. D. N. Srinivasu
Publikováno v:
Mathematics in Applied Sciences and Engineering, Vol 5, Iss 2 (2024)
This paper deals with the optimal harvesting of single-species populations in a polluted and seasonally varying environment. The presence of pollution negatively impacts resource growth, and as a consequence, the economic rent from harvest suffers. A
Externí odkaz:
https://doaj.org/article/e7f741ef1d1b49d292aef9d048bc2346
Autor:
O Lototska, M Dnistryanska
Publikováno v:
Медицина болю, Vol 8, Iss 3-4 (2024)
Headache is the leading syndrome of many diseases caused by a polluted environment. Processing of human waste reduces the negative impact of landfills of human health. The conducted survey of residents of Vinnytsia and Ternopil found that the vast ma
Externí odkaz:
https://doaj.org/article/a3719ed470ad4fbf86b5779bd1deb477
Autor:
Wei Gong, Zhanping Wang
Publikováno v:
AIMS Mathematics, Vol 8, Iss 1, Pp 125-147 (2023)
In this paper, we study the stability of a nonlinear population system with a weighted total size of scale structure and migration in a polluted environment, where fertility and mortality depend on the density in different ways. We first prove the ex
Externí odkaz:
https://doaj.org/article/1b6aeb31781343a8901978c2c4d28989
Akademický článek
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Publikováno v:
Mathematical Biosciences and Engineering, Vol 19, Iss 11, Pp 11260-11280 (2022)
This paper is concerned with a stochastic population model in a polluted environment. First, within the framework of Lyapunov method, the existence and uniqueness of a global positive solution of the model are proposed, and the sufficient conditions
Externí odkaz:
https://doaj.org/article/5d5615bb2fe44f95986d6bc44af35e76
Publikováno v:
Advances in Difference Equations, Vol 2021, Iss 1, Pp 1-15 (2021)
Abstract In this paper, we consider a new stage-structured population model with transient and nontransient impulsive effects in a polluted environment. By using the theories of impulsive differential equations, we obtain the globally asymptotically
Externí odkaz:
https://doaj.org/article/6f5770e1a9624e47a31052b2143d879a
Akademický článek
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Publikováno v:
Advances in Difference Equations, Vol 2021, Iss 1, Pp 1-19 (2021)
Abstract Based on the effects of white noise and colored noise, we propose a stochastic Holling-III predator–prey model in an impulsive polluted environment. Firstly, we prove an existence and uniqueness theorem of the presented model. Secondly, we
Externí odkaz:
https://doaj.org/article/94b3e78b7a514059a7c13f61a8083ee6
Publikováno v:
Advances in Difference Equations, Vol 2020, Iss 1, Pp 1-16 (2020)
Abstract We propose and study a stochastic delay single-species population system in polluted environment with psychological effect and pulse toxicant input. We establish sufficient conditions for the extinction, nonpersistence in the mean, weak pers
Externí odkaz:
https://doaj.org/article/9550dea5a506426697289e3e01c411ad