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Symmetry, Volume 12, Issue 10

October 2020 - 170 articles

Cover Story: A D2-symmetric porphyrinoid was designed to assemble three metal ions in a linear array. (S)-Binaphthol subunits embedded in a macrocycle core induced a (P,P)-helical figure-eight ring conformation. The present robust trinuclear metal complexes are expected to have potential applications in materials science, especially relevant to chirality. View this paper
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Articles (170)

  • Article
  • Open Access
2 Citations
2,138 Views
19 Pages

21 October 2020

We show the use of parametrization techniques and successive approximations for the effective construction of solutions of linear boundary value problems for differential systems with multiple argument deviations. The approach is illustrated with a n...

  • Article
  • Open Access
11 Citations
3,209 Views
18 Pages

An Anisotropic Model for the Universe

  • Morgan Le Delliou,
  • Maksym Deliyergiyev and
  • Antonino del Popolo

21 October 2020

Motivated by the back-reaction debate, and some unexplained characteristics of the CMB, we investigate the possibility of some anisotropy in the universe observed around us. To this aim, we build up a novel prediction for the Hubble law for the late...

  • Article
  • Open Access
36 Citations
6,395 Views
15 Pages

An Effective and Improved CNN-ELM Classifier for Handwritten Digits Recognition and Classification

  • Saqib Ali,
  • Jianqiang Li,
  • Yan Pei,
  • Muhammad Saqlain Aslam,
  • Zeeshan Shaukat and
  • Muhammad Azeem

21 October 2020

Optical character recognition is gaining immense importance in the domain of deep learning. With each passing day, handwritten digits (0–9) data are increasing rapidly, and plenty of research has been conducted thus far. However, there is still...

  • Article
  • Open Access
5 Citations
2,682 Views
11 Pages

Circular Intensely Orthogonal Double Cover Design of Balanced Complete Multipartite Graphs

  • M. Higazy,
  • A. El-Mesady,
  • Emad E. Mahmoud and
  • Monagi H. Alkinani

21 October 2020

In this paper, we generalize the orthogonal double covers (ODC) of Kn,n as follows. The circular intensely orthogonal double cover design (CIODCD) of X=Kn,n,…,n︸m is defined as a collection T={G00,G10,…,G(n−1)0}∪{G01,G11,&hell...

  • Article
  • Open Access
1 Citations
3,319 Views
21 Pages

21 October 2020

We present a simple reaction model to study the influence of the size, number, and spatial arrangement of reactive patches on a reactant placed on a plane. Specifically, we consider a reactant whose surface has an N × N square grid structure, w...

  • Article
  • Open Access
23 Citations
6,558 Views
16 Pages

Improving the Results of the Earned Value Management Technique Using Artificial Neural Networks in Construction Projects

  • Amirhossein Balali,
  • Alireza Valipour,
  • Jurgita Antucheviciene and
  • Jonas Šaparauskas

21 October 2020

The cost, time and scope of a construction project are key parameters for its success. Thus, predicting these indices is indispensable. Correct and accurate prediction of cost throughout the progress of a project gives project managers the chance to...

  • Article
  • Open Access
19 Citations
4,271 Views
17 Pages

21 October 2020

Joint named entity recognition and relation extraction is an essential natural language processing task that aims to identify entities and extract the corresponding relations in an end-to-end manner. At present, compared with the named entity recogni...

  • Article
  • Open Access
3 Citations
2,478 Views
18 Pages

21 October 2020

Symmetry is one of the important properties of Social networks to indicate the co-existence relationship between two persons, e.g., friendship or kinship. Centrality is an index to measure the importance of vertices/persons within a social network. M...

  • Article
  • Open Access
8 Citations
2,398 Views
7 Pages

21 October 2020

For a complex catalytic reaction with a single-route linear mechanism, a new, kinetico-thermodynamic form of the steady-state reaction rate is obtained, and we show how its symmetries in terms of the kinetic and thermodynamic parameters allow better...

  • Article
  • Open Access
43 Citations
4,090 Views
16 Pages

Error Estimation of the Homotopy Perturbation Method to Solve Second Kind Volterra Integral Equations with Piecewise Smooth Kernels: Application of the CADNA Library

  • Samad Noeiaghdam,
  • Aliona Dreglea,
  • Jihuan He,
  • Zakieh Avazzadeh,
  • Muhammad Suleman,
  • Mohammad Ali Fariborzi Araghi,
  • Denis N. Sidorov and
  • Nikolai Sidorov

20 October 2020

This paper studies the second kind linear Volterra integral equations (IEs) with a discontinuous kernel obtained from the load leveling and energy system problems. For solving this problem, we propose the homotopy perturbation method (HPM). We then d...

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Symmetry - ISSN 2073-8994