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Applied Sciences, Volume 13, Issue 8

April-2 2023 - 570 articles

Cover Story: In this work, a novel metamaterial lens (metalens) is designed and optimized to improve the radiation performance of an antipodal Vivaldi antenna for wideband applications. The metalens is integrated into the antenna substrate and placed close to the tapered slot in the end-fire direction, allowing the antenna to maintain its light weight and compactness. The prototype has been fabricated and characterized, demonstrating good agreement with the simulations. The insertion of the metalens allows, with respect to the pristine Vivaldi, a measured maximum gain of Gmax=14.2  dB, increased by about ΔGmax=4.8 dB; an operating bandwidth of f=3÷14.7 GHz, increased by Δf=1.2 GHz; and a radiation pattern with a maximum reduction in half-power beamwidth of ΔHPBWmax=31.3°, which is more symmetrical in the E and H planes. View this paper
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Articles (570)

  • Article
  • Open Access
9 Citations
3,353 Views
16 Pages

21 April 2023

The convection thermal coupling between adjacent power devices in power converters is dependent on the ambient temperature. When the ambient temperature changes, the convection thermal coupling also changes. This results in an inaccurate thermal mode...

  • Article
  • Open Access
8 Citations
3,377 Views
9 Pages

21 April 2023

Lemon essential oil (LEO) is associated with a multitude of health benefits due to its anticancer, antioxidant, antiviral, anti-inflammatory and bactericidal properties. Its drawback is that it is very sensitive to oxidation by heat. For this reason,...

  • Article
  • Open Access
6 Citations
4,508 Views
39 Pages

21 April 2023

As an ancient performing art, the puppet show was popular entertainment for early civilians. However, with the advance of media technology, traditional puppetry declined gradually, and old puppets became relics displayed in museums. In this study, an...

  • Article
  • Open Access
16 Citations
2,533 Views
20 Pages

21 April 2023

The formation of ice on nacelle causes the reduction or loss of aerodynamic performance, fuel consumption increases, reduced thrust, and the ingestion of ice, which can damage the engine. The piccolo tube anti-icing employed as an active ice protecti...

  • Article
  • Open Access
8 Citations
3,424 Views
27 Pages

Multi-Class Transfer Learning and Domain Selection for Cross-Subject EEG Classification

  • Rito Clifford Maswanganyi,
  • Chungling Tu,
  • Pius Adewale Owolawi and
  • Shengzhi Du

21 April 2023

Transfer learning (TL) has been proven to be one of the most significant techniques for cross-subject classification in electroencephalogram (EEG)-based brain-computer interfaces (BCI). Hence, it is widely used to address the challenges of cross-sess...

  • Communication
  • Open Access
12 Citations
3,391 Views
9 Pages

The Modification of Titanium Surface by Decomposition of Tannic Acid Coating

  • Beata Kaczmarek-Szczepańska,
  • Lidia Zasada,
  • Marta Michalska-Sionkowska,
  • Jithin Vishnu and
  • Geetha Manivasagam

21 April 2023

Titanium is one of the most widely used metals in implantology owing to its reduced modulus, improved corrosion resistance and good biocompatibility. In spite of its excellent biocompatibility, it does not exhibit inherent antibacterial and antioxida...

  • Review
  • Open Access
5 Citations
41,000 Views
24 Pages

Electromyographic Activity of the Pectoralis Major Muscle during Traditional Bench Press and Other Variants of Pectoral Exercises: A Systematic Review and Meta-Analysis

  • Abraham López-Vivancos,
  • Noelia González-Gálvez,
  • Francisco Javier Orquín-Castrillón,
  • Rodrigo Gomes de Souza Vale and
  • Pablo Jorge Marcos-Pardo

21 April 2023

The popularity of the bench press (BP) is justified by being one of the most effective exercises to improve strength and power in the upper body. The primary aim of this systematic review and meta-analysis was to compare the electromyography activity...

  • Article
  • Open Access
2,950 Views
12 Pages

T* Revise Attenuation Tomography for Q Estimation

  • Ziqi Jin,
  • Ruoteng Wang and
  • Ying Shi

21 April 2023

Seismic attenuation is often calculated by attenuated travel time tomography. The accuracy of this method is controlled by the precision of attenuated travel time. In this paper, a novel T* revise in attenuated travel time tomography method for Q inv...

  • Article
  • Open Access
6 Citations
2,262 Views
15 Pages

21 April 2023

In the operation and maintenance of planetary gearboxes, the growth of monitoring data is often faster than its analysis and classification. Careful data analysis is generally considered to require more expertise. Rendering the machine learning algor...

  • Article
  • Open Access
6 Citations
2,722 Views
18 Pages

A Study on the Optimization of the Coil Defect Detection Model Based on Deep Learning

  • Chun-Myoung Noh,
  • Jun-Gyo Jang,
  • Sung-Soo Kim,
  • Soon-Sup Lee,
  • Sung-Chul Shin and
  • Jae-Chul Lee

21 April 2023

With increasing interest in smart factories, considerable attention has been paid to the development of deep-learning-based quality inspection systems. Deep-learning-based quality inspection helps productivity improvements by solving the limitations...

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Appl. Sci. - ISSN 2076-3417