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Symmetry, Volume 9, Issue 11

November 2017 - 42 articles

Cover Story: CPT and Lorentz symmetry are generally assumed to hold exactly in nature. The possibility of their violation has tested in the past with extreme precision for photons by astrophysical observations in the context of an effective field theory extension of electrodynamics. Here we show that additional CPT-violating effects may arise from photon mixing with the Z boson due to spontaneous gauge symmetry breaking in the SU(2)×U(1) electroweak model. View this paper
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Articles (42)

  • Article
  • Open Access
2 Citations
4,962 Views
8 Pages

The Choice of Gadolinium-Based Contrast Agents: A Radiologist’s Responsibility between Pharmaceutical Equivalence and Bioethical Issues

  • Gaia Cartocci,
  • Alessandro Santurro,
  • Raffaele La Russa,
  • Giuseppe Guglielmi,
  • Paola Frati and
  • Vittorio Fineschi

22 November 2017

Contrast Agents (CA) are among the most commonly prescribed drugs worldwide, and are used, with a variety of techniques, to increase and intensify the differences between body tissues and to help radiologist make diagnoses in a fast and precise way....

  • Article
  • Open Access
1 Citations
3,799 Views
13 Pages

22 November 2017

Analytical treatment of the composition of higher-order graphs representing linear relations between variables is developed. A path formalism to deal with problems in graph theory is introduced. It is shown how paths in the composed graph representin...

  • Article
  • Open Access
11 Citations
4,839 Views
19 Pages

21 November 2017

In the aquaculture industry, feed that is of poor quality or nutritionally imbalanced can cause problems including low weight, poor growth, poor palatability, and increased mortality, all of which can induce a decrease in aquaculture production. Fish...

  • Article
  • Open Access
2 Citations
3,956 Views
29 Pages

Granular Structure of Type-2 Fuzzy Rough Sets over Two Universes

  • Juan Lu,
  • De-Yu Li,
  • Yan-Hui Zhai and
  • He-Xiang Bai

21 November 2017

Granular structure plays a very important role in the model construction, theoretical analysis and algorithm design of a granular computing method. The granular structures of classical rough sets and fuzzy rough sets have been proven to be clear. In...

  • Article
  • Open Access
25 Citations
5,512 Views
14 Pages

21 November 2017

Due to the rapid development of wireless charging technology, the recharging issue in wireless rechargeable sensor network (WRSN) has been a popular research problem in the past few years. The weakness of previous work is that charging route planning...

  • Article
  • Open Access
8 Citations
4,683 Views
18 Pages

18 November 2017

Obtaining necessary information (and even extracting hidden messages) from existing big data, and then transforming them into knowledge, is an important skill. Data mining technology has received increased attention in various fields in recent years...

  • Article
  • Open Access
21 Citations
7,445 Views
20 Pages

Hierarchical Meta-Learning in Time Series Forecasting for Improved Interference-Less Machine Learning

  • David Afolabi,
  • Sheng-Uei Guan,
  • Ka Lok Man,
  • Prudence W. H. Wong and
  • Xuan Zhao

18 November 2017

The importance of an interference-less machine learning scheme in time series prediction is crucial, as an oversight can have a negative cumulative effect, especially when predicting many steps ahead of the currently available data. The on-going rese...

  • Article
  • Open Access
18 Citations
7,557 Views
14 Pages

17 November 2017

In the latest studies concerning the sentiment polarity of words, the authors mostly consider the positive and negative constructions, without paying too much attention to the neutral words, which can have, in fact, significant sentiment degrees. Mor...

  • Article
  • Open Access
8 Citations
4,223 Views
21 Pages

Time Series Seasonal Analysis Based on Fuzzy Transforms

  • Ferdinando Di Martino and
  • Salvatore Sessa

17 November 2017

We define a new seasonal forecasting method based on fuzzy transforms. We use the best interpolating polynomial for extracting the trend of the time series and generate the inverse fuzzy transform on each seasonal subset of the universe of discourse...

  • Article
  • Open Access
120 Citations
10,423 Views
34 Pages

Novel Integrated Multi-Criteria Model for Supplier Selection: Case Study Construction Company

  • Željko Stević,
  • Dragan Pamučar,
  • Marko Vasiljević,
  • Gordan Stojić and
  • Sanja Korica

17 November 2017

Supply chain presents a very complex field involving a large number of participants. The aim of the complete supply chain is finding an optimum from the aspect of all participants, which is a rather complex task. In order to ensure optimum satisfacti...

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Symmetry - ISSN 2073-8994