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Mathematics, Volume 11, Issue 14

July-2 2023 - 223 articles

Cover Story: Theis’ theory, later improved by Hantush and Jacob and Moench, is a technique designed to study the water level in aquifers. The key formula in this theory is a certain integral transform H[g](r,t) of the pumping function g that depends on the time t and the relative position r to the pumping point, as well as on other physical parameters. In this paper, the analysis of possible analytic approximations of H[g](r,t) is completed by investigating asymptotic expansions of H[g](r,t) in a region of parameters of interest in practical situations. Explicit and/or recursive algorithms for the computation of the coefficients of the expansions and estimates for the remainders are provided. Some numerical examples illustrate the accuracy of the approximations. View this paper
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Articles (223)

  • Article
  • Open Access
3 Citations
2,836 Views
38 Pages

Fuzzy Analytic Network Process with Principal Component Analysis to Establish a Bank Performance Model under the Assumption of Country Risk

  • Alin Opreana,
  • Simona Vinerean,
  • Diana Marieta Mihaiu,
  • Liliana Barbu and
  • Radu-Alexandru Șerban

24 July 2023

In recent years, bank-related decision analysis has reflected a relevant research area due to key factors that affect the operating environment of banks. This study’s aim is to develop a model based on the linkages between the performance of ba...

  • Article
  • Open Access
3 Citations
1,882 Views
15 Pages

24 July 2023

The individuals of real-world networks participate in various types of connections, each forming a layer in multiplex networks. Link prediction is an important problem in multiplex network analysis owing to its wide range of practical applications, s...

  • Article
  • Open Access
1 Citations
1,480 Views
18 Pages

24 July 2023

In this paper, the tracking control problem of a class of fuzzy approximation-based noncanonical nonlinear systems with hysteresis inputs is investigated, where the fuzzy weight matrix is not available for measurement, and the hysteresis nonlineariti...

  • Article
  • Open Access
7 Citations
1,777 Views
25 Pages

24 July 2023

Harvesting is one of the ways for humans to realize economic interests, while unrestricted harvesting will lead to the extinction of populations. This paper proposes a predator–prey model with impulsive diffusion and transient/nontransient impu...

  • Article
  • Open Access
2 Citations
1,914 Views
21 Pages

24 July 2023

This article proposes a discrete proportional-integral-derivative (PID) load frequency control (LFC) scheme to investigate the dissipative analysis issue of restructured wind power systems via a non-fragile design approach. Firstly, by taking the dif...

  • Article
  • Open Access
5 Citations
3,750 Views
25 Pages

Breast Cancer Diagnosis Using a Novel Parallel Support Vector Machine with Harris Hawks Optimization

  • Sultan Almotairi,
  • Elsayed Badr,
  • Mustafa Abdul Salam and
  • Hagar Ahmed

24 July 2023

Three contributions are proposed. Firstly, a novel hybrid classifier (HHO-SVM) is introduced, which is a combination between the Harris hawks optimization (HHO) and a support vector machine (SVM) is introduced. Second, the performance of the HHO-SVM...

  • Article
  • Open Access
5 Citations
2,412 Views
15 Pages

Transient Dynamics in Counter-Rotating Stratified Taylor–Couette Flow

  • Larry E. Godwin,
  • Philip M. J. Trevelyan,
  • Takeshi Akinaga and
  • Sotos C. Generalis

24 July 2023

This study focuses on the investigation of stratified Taylor–Couette flow (STCF) using non-modal analysis, which has received relatively limited attention compared to other shear flows. The dynamics of perturbations under different temperature condit...

  • Article
  • Open Access
2 Citations
1,770 Views
21 Pages

24 July 2023

The purpose of this research work is to explore the solution of the Fredholm integral equation by common fixed point results in bicomplex valued metric spaces. In this way, we develop some common fixed point theorems for generalized contractions cont...

  • Article
  • Open Access
4 Citations
1,671 Views
20 Pages

Formulation for Multiple Cracks Problem in Thermoelectric-Bonded Materials Using Hypersingular Integral Equations

  • Muhammad Haziq Iqmal Mohd Nordin,
  • Khairum Bin Hamzah,
  • Najiyah Safwa Khashi’ie,
  • Iskandar Waini,
  • Nik Mohd Asri Nik Long and
  • Saadatul Fitri

24 July 2023

New formulations are produced for problems associated with multiple cracks in the upper part of thermoelectric-bonded materials subjected to remote stress using hypersingular integral equations (HSIEs). The modified complex stress potential function...

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Mathematics - ISSN 2227-7390