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Symmetry, Volume 11, Issue 9

September 2019 - 122 articles

Cover Story: The illustration shows how chiral light interacts with a lossless, dual-symmetric nanosphere (left) and a lossy, metallic nanosphere (right). While both optical helicity and optical chirality conservation hold for the lossless, dual-symmetric case (left), the presence of a lossy, dispersive medium (right) breaks duality symmetry, and helicity conservation no longer holds in its physically observable form. By contrast, the conservation law of optical chirality can be formulated to account for dissipative effects in the presence of lossy, dispersive media. Cover artwork created by Jack Hu for the article “Optical Helicity and Optical Chirality in Free Space and in the Presence of Matter” by Lisa V. Poulikakos, Jennifer A. Dionne, and Aitzol Garcia-Etxarri. View this paper.
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Articles (122)

  • Article
  • Open Access
35 Citations
5,805 Views
12 Pages

19 September 2019

This work presents a new approach to speech recognition, based on the specific coding of time and frequency characteristics of speech. The research proposed the use of convolutional neural networks because, as we know, they show high resistance to cr...

  • Article
  • Open Access
6 Citations
3,676 Views
19 Pages

19 September 2019

Heterogeneity and outliers are two aspects which add considerable complexity to the analysis of data. The Cauchy mixture model is an attractive device to deal with both issues simultaneously. This paper develops an Expectation-Maximization-type algor...

  • Article
  • Open Access
17 Citations
5,529 Views
21 Pages

LCA/LCC Model for Evaluation of Pump Units in Water Distribution Systems

  • Mitar Jocanovic,
  • Boris Agarski,
  • Velibor Karanovic,
  • Marko Orosnjak,
  • Milana Ilic Micunovic,
  • Gordana Ostojic and
  • Stevan Stankovski

18 September 2019

In this multidisciplinary research, an LCA/LCC model is developed for assessing the costs, energy consumption, and greenhouse gas (GHG) emissions during the pump unit lifecycles in drinking water distribution systems (WDS). The presented methodology...

  • Article
  • Open Access
11 Citations
8,249 Views
15 Pages

18 September 2019

The success of after-sales services fundamentally depends on the possibility of symmetry balancing needs, supply and customer satisfaction. Spare parts planning (SPP) software selection is an investment in balancing the symmetry of inventory control,...

  • Article
  • Open Access
42 Citations
16,567 Views
20 Pages

A Modified Equation for Thickness of the Film Fabricated by Spin Coating

  • Un Gi Lee,
  • Woo-Byoung Kim,
  • Do Hyung Han and
  • Hyun Soo Chung

18 September 2019

According to the equation for Newtonian fluids, the film thickness after spin coating is determined by five parameters: angular velocity, spin coating time, viscosity, density of the coating material, and initial thickness of the material before spin...

  • Article
  • Open Access
12 Citations
2,812 Views
17 Pages

17 September 2019

As far as taking-away of the symmetry constraints is concerned, as a scientifically symmetry problem, the global synthesis for antenna arrays that produce the desired radiation pattern is also a highly nonlinear optimization issue in fact. Besides th...

  • Article
  • Open Access
7 Citations
3,158 Views
19 Pages

Converging Cylindrical Symmetric Shock Waves in a Real Medium with a Magnetic Field

  • Munesh Devi,
  • Rajan Arora,
  • Mustafa M. Rahman and
  • Mohd Junaid Siddiqui

17 September 2019

The topic “converging shock waves” is quite useful in Inertial Confinement Fusion (ICF). Most of the earlier studies have assumed that the medium of propagation is ideal. However, due to very high temperature at the axis of convergence, t...

  • Article
  • Open Access
5 Citations
3,684 Views
8 Pages

Commuting Graphs, C(G, X) in Symmetric Groups Sym(n) and Its Connectivity

  • Athirah Nawawi,
  • Sharifah Kartini Said Husain and
  • Muhammad Rezal Kamel Ariffin

17 September 2019

A commuting graph is a graph denoted by C ( G , X ) where G is any group and X, a subset of a group G, is a set of vertices for C ( G , X ) . Two distinct vertices, x , y ∈ X , will be connected by an edge if the commutativ...

  • Article
  • Open Access
24 Citations
4,420 Views
20 Pages

17 September 2019

In the context of the problem of water pollution, the movement characteristics and patterns of fish under normal water quality and abnormal water quality are clearly different. This paper proposes a biological water quality monitoring method combinin...

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Symmetry - ISSN 2073-8994