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Mathematics, Volume 9, Issue 6

2021 March-2 - 114 articles

Cover Story: The diagrams show polygons tracking the quasiperiodic patterns of complex dimensions and the deviations from the approximations. They also show phase transitions with smaller horizontal deviations and new mysterious structures of complex dimensions. View this paper.
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Articles (114)

  • Article
  • Open Access
2,472 Views
10 Pages

Can Artificial Neural Networks Predict the Survival Capacity of Mutual Funds? Evidence from Spain

  • Laura Fabregat-Aibar,
  • Maria-Teresa Sorrosal-Forradellas,
  • Glòria Barberà-Mariné and
  • Antonio Terceño

23 March 2021

Recently, the total net assets of mutual funds have increased considerably and turned them into one of the main investment instruments. Despite this increment, every year a considerable number of funds disappear. The main purpose of this paper is to...

  • Feature Paper
  • Article
  • Open Access
38 Citations
5,582 Views
14 Pages

22 March 2021

In the present paper, a Random Forest classifier is used to detect leak locations on two different sized water distribution networks with sparse sensor placement. A great number of leak scenarios were simulated with Monte Carlo determined leak parame...

  • Article
  • Open Access
32 Citations
4,106 Views
18 Pages

Fractional System of Korteweg-De Vries Equations via Elzaki Transform

  • Wenfeng He,
  • Nana Chen,
  • Ioannis Dassios,
  • Nehad Ali Shah and
  • Jae Dong Chung

22 March 2021

In this article, a hybrid technique, called the Iteration transform method, has been implemented to solve the fractional-order coupled Korteweg-de Vries (KdV) equation. In this method, the Elzaki transform and New Iteration method are combined. The i...

  • Article
  • Open Access
2,219 Views
12 Pages

22 March 2021

This manuscript concerns two definite integrals that could be connected to the Bose-Einstein and the Fermi-Dirac functions in the integrands, separately, with numerators slightly modified with a difference in two expressions that contain the Fourier...

  • Article
  • Open Access
18 Citations
3,470 Views
19 Pages

22 March 2021

In this paper, the wastewater treatment model is investigated by means of one of the most robust fractional derivatives, namely, the Caputo fractional derivative. The growth rate is assumed to obey the Contois model, which is often used to model the...

  • Article
  • Open Access
7 Citations
2,632 Views
11 Pages

On an Intuitionistic Fuzzy Form of the Goguen’s Implication

  • Krassimir Atanassov,
  • Nora Angelova and
  • Vassia Atanassova

22 March 2021

In the present paper we construct a new intuitionistic fuzzy implication, giving intuitionistic fuzzy form to Goguen’s implication. Some of its basic properties are studied and illustrated with examples. Geometrical interpretations of the different f...

  • Article
  • Open Access
14 Citations
4,206 Views
33 Pages

A Local Spatial STIRPAT Model for Outdoor NOx Concentrations in the Community of Madrid, Spain

  • José-María Montero,
  • Gema Fernández-Avilés and
  • Tiziana Laureti

22 March 2021

Air pollution control is one of the main challenges facing modern societies. Consequently, the estimation of population, affluence, and technology impacts on air pollution concentrations (STIRPAT modeling) has become the cornerstone of environmental...

  • Feature Paper
  • Article
  • Open Access
8 Citations
2,506 Views
23 Pages

Vehicle Response to Kinematic Excitation, Numerical Simulation Versus Experiment

  • Jozef Melcer,
  • Eva Merčiaková,
  • Mária Kúdelčíková and
  • Veronika Valašková

22 March 2021

The article is devoted to the numerical simulation and experimental verification of a vehicle’s response to kinematic excitation caused by driving along an asphalt road. The source of kinematic excitation was road unevenness, which was mapped by geod...

  • Article
  • Open Access
4 Citations
4,012 Views
20 Pages

22 March 2021

Screening for cervical cancer is a critical policy that requires clinical and managerial vigilance because of its serious health consequences. Recently the practice of conducting simultaneous tests of cytology and Human Papillomavirus (HPV)-DNA testi...

  • Article
  • Open Access
7 Citations
2,744 Views
17 Pages

22 March 2021

In this study we show that concept of backward bifurcation, borrowed from epidemics, can be fruitfully exploited to shed light on the mechanism underlying the occurrence of hysteresis in marketing and for the strategic planning of adequate tools for...

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Mathematics - ISSN 2227-7390