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Symmetry, Volume 14, Issue 7

July 2022 - 215 articles

Cover Story: This paper provides an overview of a few basic topics in functional analysis, joined together by the notion of convexity and its applications. The references partially illustrate old and recent research in this area and relationships between them. The motivation of this paper consists of pointing out two different main aspects of convexity: convex operators and their properties, and Hahn–Banach type theorems applied to the Moment Problem. Concerning the second aspect, a related optimization problem with infinitely many linear constraints is solved. View this paper
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Articles (215)

  • Feature Paper
  • Article
  • Open Access
8 Citations
3,073 Views
18 Pages

Analysis of Drill-String Nonlinear Dynamics Using the Lumped-Parameter Method

  • Lelya A. Khajiyeva,
  • Igor V. Andrianov,
  • Yuliya F. Sabirova and
  • Askar K. Kudaibergenov

21 July 2022

This work aims at studying the nonlinear dynamics of drill strings using the lumped-parameter method (LPM). The study is based on the good consistency of the results of the test problem where the model of the longitudinal vibrations of a horizontal d...

  • Article
  • Open Access
84 Citations
4,136 Views
17 Pages

21 July 2022

The stagnation point flow of unsteady compressible Casson hybrid nanofluid flow over a vertical stretching sheet was analyzed. The comparative study of Yamada Ota, Tiwari Das, and Xue hybrid nanofluid models was performed. The Lorentz force was appli...

  • Article
  • Open Access
5 Citations
2,127 Views
12 Pages

21 July 2022

Fatigue in a material occurs when it is subjected to fluctuating stress and strain, which usually results in failure due to the accumulated damage. In statistics, asymmetric distribution, which is commonly used for describing the fatigue life of mate...

  • Article
  • Open Access
2,278 Views
22 Pages

21 July 2022

In recent years, the m-polar fuzziness structure and the cubic structure have piqued the interest of researchers and have been commonly implemented in algebraic structures like groupoids, semigroups, groups, rings and lattices. The cubic m-polar (CmP...

  • Article
  • Open Access
4 Citations
5,759 Views
43 Pages

21 July 2022

Design patterns are common solutions to existing issues in software engineering. In recent decades, design patterns have been researched intensively because they increase the quality factors of software systems such as flexibility, maintainability, a...

  • Article
  • Open Access
15 Citations
3,950 Views
14 Pages

Few-Shot Learning for Fault Diagnosis: Semi-Supervised Prototypical Network with Pseudo-Labels

  • Jun He,
  • Zheshuai Zhu,
  • Xinyu Fan,
  • Yong Chen,
  • Shiya Liu and
  • Danfeng Chen

21 July 2022

Achieving deep learning-based bearing fault diagnosis heavily relies on large labeled training samples. However, in real industry applications, labeled data are scarce or even impossible to obtain. In this study, we addressed a challenging few-shot b...

  • Article
  • Open Access
1,878 Views
20 Pages

21 July 2022

The paper’s main purpose is to find the unknown source function for the conformable heat equation. In the case of (Φ,g)∈L2(0,T)×L2(Ω), we give a modified Fractional Landweber solution and explore the error between the appro...

  • Article
  • Open Access
2 Citations
2,231 Views
10 Pages

21 July 2022

A numerical analysis of an unsteady radiative and viscous dissipative fluid flow across a semi-infinite oscillating vertical plate with a constant temperature and mass diffusion is examined here. The fluid under consideration is optically thin gray,...

  • Article
  • Open Access
9 Citations
4,792 Views
31 Pages

A Novel Deep Learning Model for Sea State Classification Using Visual-Range Sea Images

  • Muhammad Umair,
  • Manzoor Ahmed Hashmani,
  • Syed Sajjad Hussain Rizvi,
  • Hasmi Taib,
  • Mohd Nasir Abdullah and
  • Mehak Maqbool Memon

20 July 2022

Wind-waves exhibit variations both in shape and steepness, and their asymmetrical nature is a well-known feature. One of the important characteristics of the sea surface is the front-back asymmetry of wind-wave crests. The wind-wave conditions on the...

  • Article
  • Open Access
1,937 Views
15 Pages

Experimental Study on Dynamic Performance of Tubular Flange Grid-Type Dam under Impact Load

  • Xiu-Li Wang,
  • Yong Yao,
  • Sai-Long Wang,
  • Zhu-Jun Feng and
  • Yun-Peng Chu

20 July 2022

As one of the most dangerous geological hazards in the world, debris flows can destroy trees and structures, break electrical, water, and gas lines, and disrupt bridges and roadways in a short period of time, threatening life and property. In particu...

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Symmetry - ISSN 2073-8994