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Mathematics, Volume 11, Issue 13

2023 July-1 - 245 articles

Cover Story: Two nutrient–phytoplankton–zooplankton (NZP) models for a closed ecosystem that incorporates a delay in nutrient recycling, obtained using the gamma distribution function with one or two degrees of freedom, are analysed. The purpose of the study is to investigate how the mean delay of the distribution and total nutrients affect the stability of the equilibrium solutions. It is found that both models exhibit comparable qualitative dynamics. Three equilibrium points are found and at most, one of them is locally asymptotically stable. The change in local stability takes place through transcritical bifurcation. In some hypotheses on the functional response, the NPZ equilibrium loses stability via a supercritical Hopf bifurcation, causing the apparition of a stable limit cycle. View this paper
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Articles (245)

  • Article
  • Open Access
5 Citations
1,729 Views
30 Pages

7 July 2023

Axially moving wing aircraft can better adapt to the flight environment, improve flight performance, reduce flight resistance, and improve flight distance. This paper simplifies the fully unfolded axially moving wing into a stepped cantilever plate m...

  • Article
  • Open Access
7 Citations
8,390 Views
17 Pages

7 July 2023

The article presents the predictive capabilities of a fuzzy multi-criteria evaluation system that operates on the basis of a non-fuzzy neural approach, but also one that is capable of implementing a learning paradigm and working with vague concepts....

  • Article
  • Open Access
2 Citations
1,775 Views
30 Pages

7 July 2023

The electrical energy supply of industrial equipment is provided by electrical power stations with high- (HT), medium- (MV) and low-voltage (LV) busbars. Consumers are connected to either MV or LV busbars. In this paper, a real power station was cons...

  • Article
  • Open Access
5 Citations
1,877 Views
18 Pages

A Cubic Class of Iterative Procedures for Finding the Generalized Inverses

  • Munish Kansal,
  • Manpreet Kaur,
  • Litika Rani and
  • Lorentz Jäntschi

7 July 2023

This article considers the iterative approach for finding the Moore–Penrose inverse of a matrix. A convergence analysis is presented under certain conditions, demonstrating that the scheme attains third-order convergence. Moreover, theoretical...

  • Article
  • Open Access
4 Citations
1,458 Views
16 Pages

7 July 2023

We consider the coefficient inverse problem for the 2D acoustic equation. The problem is recovering the speed of sound in the medium (which depends only on the depth) and the density (function of both variables). We describe the method, based on the...

  • Article
  • Open Access
4 Citations
2,353 Views
18 Pages

Light Pollution Index System Model Based on Markov Random Field

  • Liangkun Fang,
  • Zhangjie Wu,
  • Yuan Tao and
  • Jinfeng Gao

7 July 2023

Light pollution is one of the environmental pollution problems facing the world. The research on the measurement standard of light pollution is not perfect at present. In this paper, we proposed a Markov random field model to determine the light poll...

  • Article
  • Open Access
2 Citations
2,481 Views
23 Pages

7 July 2023

Based on China’s summary of three years of experience and measures in the prevention and control of the COVID-19 epidemic, we have built a COVID-19 prevention and control model integrating health and medical detection, big data information tech...

  • Article
  • Open Access
2 Citations
4,937 Views
26 Pages

Early Identification of Risk Factors in Non-Alcoholic Fatty Liver Disease (NAFLD) Using Machine Learning

  • Luis Rolando Guarneros-Nolasco,
  • Giner Alor-Hernández,
  • Guillermo Prieto-Avalos and
  • José Luis Sánchez-Cervantes

7 July 2023

Liver diseases are a widespread and severe health concern, affecting millions worldwide. Non-alcoholic fatty liver disease (NAFLD) alone affects one-third of the global population, with some Latin American countries seeing rates exceeding 50%. This a...

  • Article
  • Open Access
1 Citations
4,473 Views
20 Pages

7 July 2023

In this study, we investigated a new zeta formula in which the zeta function can be expressed as the sum of an infinite series of delta and cosine functions. Our findings demonstrate that this formula possesses duality characteristics and we establis...

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Mathematics - ISSN 2227-7390