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Mathematics, Volume 11, Issue 5

March-1 2023 - 209 articles

Cover Story: In differential geometry of manifolds with additional tensor structures, an important role is played by those affine connections which preserve the structure tensors and the metric connections, also known as natural connections. In the present work, we study the almost paracontact and almost paracomplex Riemannian manifolds, called Riemannian Π-manifolds. We define the concept of natural connection on these manifolds, and we prove a necessary and sufficient condition—an affine connection—to be natural. Moreover, we introduce a non-symmetric natural connection, and we call it the first natural connection on the Riemannian Π-manifold. We obtain relations between this connection and the Levi-Civita connection, and we study some of its curvature characteristics. We support the results using an explicit example of dimension 5. View this paper
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Articles (209)

  • Article
  • Open Access
7 Citations
2,862 Views
29 Pages

6 March 2023

This paper focuses mainly on the problem of computing the γth, γ>0, moment of a random variable Yn:=∑i=1nαiXi in which the αi’s are positive real numbers and the Xi’s are independent and distributed accordin...

  • Article
  • Open Access
2 Citations
2,962 Views
20 Pages

JQPro:Join Query Processing in a Distributed System for Big RDF Data Using the Hash-Merge Join Technique

  • Nahla Mohammed Elzein,
  • Mazlina Abdul Majid,
  • Ibrahim Abaker Targio Hashem,
  • Ashraf Osman Ibrahim,
  • Anas W. Abulfaraj and
  • Faisal Binzagr

6 March 2023

In the last decade, the volume of semantic data has increased exponentially, with the number of Resource Description Framework (RDF) datasets exceeding trillions of triples in RDF repositories. Hence, the size of RDF datasets continues to grow. Howev...

  • Article
  • Open Access
4 Citations
3,528 Views
16 Pages

6 March 2023

This paper introduces a novel distributionally robust mean-variance portfolio estimator based on the projection robust Wasserstein (PRW) distance. This approach addresses the issue of increasing conservatism of portfolio allocation strategies due to...

  • Article
  • Open Access
24 Citations
8,805 Views
18 Pages

6 March 2023

The novel coronavirus pandemic is a major global public health emergency, and has presented new challenges and requirements for the timely response and operational stability of emergency logistics that were required to address the major public health...

  • Article
  • Open Access
92 Citations
4,761 Views
36 Pages

Mountaineering Team-Based Optimization: A Novel Human-Based Metaheuristic Algorithm

  • Iman Faridmehr,
  • Moncef L. Nehdi,
  • Iraj Faraji Davoudkhani and
  • Alireza Poolad

6 March 2023

This paper proposes a novel optimization method for solving real-world optimization problems. It is inspired by a cooperative human phenomenon named the mountaineering team-based optimization (MTBO) algorithm. Proposed for the first time, the MTBO al...

  • Article
  • Open Access
3 Citations
2,430 Views
14 Pages

A Flexible Class of Two-Piece Normal Distribution with a Regression Illustration to Biaxial Fatigue Data

  • Hugo Salinas,
  • Hassan Bakouch,
  • Najla Qarmalah and
  • Guillermo Martínez-Flórez

6 March 2023

Using a two-piece normal distribution for modeling univariate data that exhibits symmetry, and uni/bimodality is notably effective. In this respect, the shape parameter value determines whether unimodality or bimodality is present. This paper propose...

  • Article
  • Open Access
12 Citations
2,474 Views
30 Pages

6 March 2023

In this paper, optimal and multi-objective planning of a hybrid energy system (HES) with wind turbine and battery storage (WT/Battery) has been proposed to drop power loss, smooth voltage profile, enhance customers reliability, as well as minimize th...

  • Article
  • Open Access
11 Citations
3,222 Views
17 Pages

Mathematical and Experimental Model of Neuronal Oscillator Based on Memristor-Based Nonlinearity

  • Ivan Kipelkin,
  • Svetlana Gerasimova,
  • Davud Guseinov,
  • Dmitry Pavlov,
  • Vladislav Vorontsov,
  • Alexey Mikhaylov and
  • Victor Kazantsev

6 March 2023

This article presents a mathematical and experimental model of a neuronal oscillator with memristor-based nonlinearity. The mathematical model describes the dynamics of an electronic circuit implementing the FitzHugh–Nagumo neuron model. A nonl...

  • Article
  • Open Access
8 Citations
2,739 Views
18 Pages

6 March 2023

With the rapid development of the Internet of Things and the popularity of numerous sensing devices, Mobile crowdsourcing (MCS) has become a paradigm for collecting sensing data and solving problems. However, most early studies focused on schemes of...

  • Article
  • Open Access
7 Citations
2,000 Views
13 Pages

Delay-Dependent Stability Region for the Distributed Coordination of Delayed Fractional-Order Multi-Agent Systems

  • Abbasali Koochakzadeh,
  • Mojtaba Naderi Soorki,
  • Aydin Azizi,
  • Kamran Mohammadsharifi and
  • Mohammadreza Riazat

6 March 2023

Delay and especially delay in the transmission of agents’ information, is one of the most important causes of disruption to achieving consensus in a multi-agent system. This paper deals with achieving consensus in delayed fractional-order multi...

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Mathematics - ISSN 2227-7390