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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
2 Citations
5,482 Views
15 Pages

Signals Intelligence System with Software-Defined Radio

  • Florin Radu,
  • Petru A. Cotfas,
  • Marian Alexandru,
  • Titus C. Bălan,
  • Vlad Popescu and
  • Daniel T. Cotfas

21 April 2023

In this paper, we present the implementation of a system that identifies the modulation of complex radio signals. This is realized using an artificial intelligence model developed, trained, and integrated with Microsoft Azure cloud. We consider that...

  • Article
  • Open Access
4 Citations
3,016 Views
20 Pages

Leveraging Causal Reasoning in Educational Data Mining: An Analysis of Brazilian Secondary Education

  • Rogério Luiz Cardoso Silva Filho,
  • Kellyton Brito and
  • Paulo Jorge Leitão Adeodato

21 April 2023

This study presents an approach to investigating the main interventions related to gains on performance using a combination of educational data mining (EDM) techniques and traditional theory-driven models. The goal is to overcome the limitation of pr...

  • Article
  • Open Access
2 Citations
2,516 Views
21 Pages

Biogas Production and Metagenomic Analysis in a New Hybrid Anaerobic Labyrinth-Flow Bioreactor Treating Dairy Wastewater

  • Marcin Zieliński,
  • Marta Kisielewska,
  • Marcin Dębowski,
  • Paulina Rusanowska,
  • Anna Nowicka and
  • Magda Dudek

21 April 2023

Increasing worldwide milk manufacturing and dairy processing resulted in producing more effluents, and thus effective management of wastewater is now the most important issue. This study used a new design of a pilot plant-scale hybrid anaerobic labyr...

  • Article
  • Open Access
8 Citations
3,211 Views
18 Pages

Modeling Evacuees’ Intended Responses to a Phased Hurricane Evacuation Order

  • Ruijie Bian,
  • Pamela Murray-Tuite,
  • Joseph Trainor,
  • Praveen Edara and
  • Konstantinos Triantis

21 April 2023

Phased evacuation is an under-studied strategy, and relatively little is known about compliance with the phased process. This study modelled households’ responses to a phased evacuation order based on a household behavioral intention survey. Ab...

  • Article
  • Open Access
5 Citations
2,715 Views
21 Pages

21 April 2023

The tailwater tunnel of the Wuyue pumped storage power station is located in bedrock and extends to depths between tens and hundreds of meters. It is impossible to analyze and evaluate the whole engineering area from geological exploration data, and...

  • Feature Paper
  • Article
  • Open Access
6 Citations
3,068 Views
12 Pages

21 April 2023

For the narrow gap dissimilar weld between a ferritic steel and a nickel base superalloy, a nickel base alloy buttering layer is deposited on the ferritic steel side as an intermediate layer. The bonding between the buttering layer and the ferritic s...

  • Article
  • Open Access
10 Citations
2,175 Views
17 Pages

21 April 2023

As a green, safe, and efficient method of coal development, underground coal gasification (UCG) technology has gradually moved from the experimental stage to the industrial production stage. This technology plays one of the key roles in the sustainab...

  • Article
  • Open Access
8 Citations
3,057 Views
11 Pages

Assessment of Photosynthetic Carbon Capture versus Carbon Footprint of an Industrial Microalgal Process

  • Arthur Oliver,
  • Cristobal Camarena-Bernard,
  • Jules Lagirarde and
  • Victor Pozzobon

21 April 2023

It is often read that industrial microalgal biotechnology could contribute to carbon capture through photosynthesis. While technically accurate, this claim is rarely supported by sound figures nor put in regard to the carbon emissions associated with...

  • Article
  • Open Access
6 Citations
2,637 Views
22 Pages

Integrated Optimization of Process Planning and Scheduling for Aerospace Complex Component Based on Honey-Bee Mating Algorithm

  • Guozhe Yang,
  • Qingze Tan,
  • Zhiqiang Tian,
  • Xingyu Jiang,
  • Keqiang Chen,
  • Yitao Lu,
  • Weijun Liu and
  • Peisheng Yuan

21 April 2023

To cope with the problems of poor matching between processing characteristics and manufacturing resources, low production efficiency, and the hard-to-meet dynamic and changeable model requirements in multi-variety and small batch aerospace enterprise...

  • Article
  • Open Access
3 Citations
2,527 Views
15 Pages

Short-Term Risk Estimation and Treatment Planning for Cardiovascular Disease Patients after First Diagnostic Catheterizations with Machine Learning Models

  • Guochang Ye,
  • Peshala Thibbotuwawa Gamage,
  • Vignesh Balasubramanian,
  • John K.-J. Li,
  • Ersoy Subasi,
  • Munevver Mine Subasi and
  • Mehmet Kaya

21 April 2023

Cardiovascular disease (CVD) is the leading cause of death. CVD symptoms may develop within a short-term after diagnostic catheterizations and lead to life-threatening situations. This study is the first to apply machine learning (ML) methods to pred...

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Appl. Sci. - ISSN 2076-3417