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27 Results Found

  • Article
  • Open Access
298 Views
24 Pages

Periodic Variable Star Classification in Imbalanced Data: A Two-Stage Decoupled Approach with Multimodal Contrastive Learning

  • Qingyu Lu,
  • Feng Zhang,
  • Zhiqiang Zou,
  • Tianyu Su and ,
  • Xiaohang Zhang,
  • A-Li Luo and
  • Xiao Kong
  • + 2 authors+ 0 author

19 September 2026

Large photometric surveys require classification methods that retain sensitivity to sparsely represented periodic variable-star classes. We present a two-stage decoupled multimodal network (TDMN) for imbalanced periodic-variable-star classification u...

(This article belongs to the Special Issue New Discoveries in Astronomical Data (II))
  • Article
  • Open Access
9 Citations
4,295 Views
13 Pages

Classification of Variable Star Light Curves with Convolutional Neural Network

  • Almat Akhmetali,
  • Timur Namazbayev,
  • Gulnur Subebekova,
  • Marat Zaidyn and ,
  • Aigerim Akniyazova,
  • Yeskendyr Ashimov and
  • Nurzhan Ussipov
  • + 2 authors+ 0 author

12 November 2024

The classification of variable stars is essential for understanding stellar evolution and dynamics. With the growing volume of light curve data from extensive surveys, there is a need for automated and accurate classification methods. Traditional met...

  • Article
  • Open Access
482 Views
32 Pages

3 September 2026

The booming data volume of modern time-domain surveys demands fast, robust early classification of sparsely sampled light curves, as newly discovered transients typically have only a handful of observations. We compare classifiers for extremely spars...

(This article belongs to the Special Issue New Discoveries in Astronomical Data (II))
  • Article
  • Open Access
1 Citations
2,507 Views
75 Pages

A Catalog of 73 B-Type Stars and Their Brightness Variation from K2 Campaign 13–18

  • Bergerson V. H. V. da Silva,
  • Jéssica M. Eidam,
  • Alan W. Pereira,
  • M. Cristina Rabello-Soares and ,
  • Eduardo Janot-Pacheco,
  • Laerte Andrade and
  • Marcelo Emilio
  • + 2 authors+ 0 author

3 September 2025

The variability of B-type stars offers valuable insights into the interiors of stars and the processes that drive pulsation and rotation in massive stars. In this study, we present the classification of the variability of 197 B-type stars observed in...

(This article belongs to the Special Issue Variable Stars in the 21st Century: From Microvariability to Megavariability)
  • Review
  • Open Access
3,098 Views
24 Pages

8 September 2025

The Optical Gravitational Lensing Experiment (OGLE) is one of the most productive and influential photometric sky surveys in the history of observational astronomy. Originally designed to detect dark matter through gravitational microlensing events,...

(This article belongs to the Special Issue Variable Stars in the 21st Century: From Microvariability to Megavariability)
  • Article
  • Open Access
1,057 Views
20 Pages

30 December 2025

We present a comprehensive study of variable stars in the young open cluster NGC 663, combining ground-based 50BiN photometry, space-based TESS time-series observations, and astrometric measurements from Gaia DR3. A total of 60 variable candidates we...

(This article belongs to the Section Solar and Stellar Physics)
  • Review
  • Open Access
27 Citations
4,508 Views
24 Pages

23 April 2025

Symbiotic stars, interacting binaries composed of a cool giant and a hot compact companion, exhibit complex variability across the electromagnetic spectrum. Over the past decades, large-scale photometric and spectroscopic surveys from ground- and spa...

(This article belongs to the Special Issue Circumstellar Matter in Hot Star Systems)
  • Review
  • Open Access
75 Citations
10,603 Views
27 Pages

Luminous Blue Variables

  • Kerstin Weis and
  • Dominik J. Bomans

29 February 2020

Luminous Blue Variables are massive evolved stars, here we introduce this outstanding class of objects. Described are the specific characteristics, the evolutionary state and what they are connected to other phases and types of massive stars. Our cur...

(This article belongs to the Special Issue Luminous Stars in Nearby Galaxies)
  • Article
  • Open Access
2,938 Views
17 Pages

Classification of Exoplanetary Light Curves Using Artificial Intelligence

  • Leticia Flores-Pulido,
  • Liliana Ibeth Barbosa-Santillán,
  • Ma. Teresa Orozco-Aguilera and
  • Bertha Patricia Guzman-Velázquez

16 May 2025

In this article, we propose a robust star classification methodology leveraging light curves collected from 15 datasets within the Kepler field in the visible optical spectrum. By employing a Bagging neural network ensemble approach, specifically an...

  • Review
  • Open Access
67 Citations
7,576 Views
36 Pages

29 September 2019

Stellar evolution theory is most uncertain for massive stars. For reliable predictions of the evolution of massive stars and their final fate, solid constraints on the physical parameters, and their changes along the evolution and in different enviro...

(This article belongs to the Special Issue Luminous Stars in Nearby Galaxies)
  • Article
  • Open Access
6 Citations
4,771 Views
19 Pages

22 November 2023

This study was focused on the configuration design of a star grain by using machine learning in the optimal design process. The key to optimizing the grain design is aimed at obtaining a set of configuration variables that satisfy the requirements. T...

(This article belongs to the Special Issue Application of Multidisciplinary Optimization and Artificial Intelligence Techniques to Aerospace Engineering (Volume II))
  • Article
  • Open Access
7 Citations
5,533 Views
13 Pages

Efficacy of Different Fluoride Therapies on Hypersensitive Carious Lesions in Primary Teeth

  • Mohamed Abudrya,
  • Christian H. Splieth,
  • Mhd Said Mourad and
  • Ruth M. Santamaría

20 November 2023

Background and Objectives: This prospective, comparative, double-cohort study aimed to compare the efficacy of silver diamine fluoride and potassium iodide (38% SDF+KI; Riva Star®) with sodium fluoride varnish (5% NaF; Duraphat®) in hypersens...

(This article belongs to the Special Issue Updates on Caries Management in the Primary and Permanent Dentition)
  • Review
  • Open Access
2 Citations
4,302 Views
14 Pages

Systematic monitoring of specific targets in the optical regime was historically applied on a very narrow sample of known variable stars. The discovery of blazars in the 20th century brought to the foreground the need for new global sky surveys, cove...

(This article belongs to the Special Issue Monitoring the Non-Thermal Universe)
  • Article
  • Open Access
8 Citations
5,855 Views
17 Pages

17 March 2025

The classification of agricultural products is of great importance for quality control, optimized marketing, efficient logistics, research progress, consumer satisfaction, and sustainability. Dragon fruit has many varieties that need to be identified...

  • Article
  • Open Access
5 Citations
3,548 Views
23 Pages

Automated Classification of Massive Spectra Based on Enhanced Multi-Scale Coded Convolutional Neural Network

  • Bin Jiang,
  • Donglai Wei,
  • Jiazhen Liu,
  • Shuting Wang and ,
  • Liyun Cheng,
  • Zihao Wang and
  • Meixia Qu
  • + 2 authors+ 0 author

The Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) has produced massive medium-resolution spectra. Data mining for special and rare stars in massive LAMOST spectra is of great significance. Feature extraction plays an important ro...

  • Article
  • Open Access
12 Citations
5,456 Views
12 Pages

Agency Nursing Staff Utilization and Turnover in Nursing Homes: A Longitudinal Analysis

  • Rohit Pradhan,
  • Ganisher Davlyatov,
  • Latarsha Chisholm,
  • Cynthia Williams and ,
  • Keya Sen,
  • Amelia Manning and
  • Robert Weech-Maldonado
  • + 2 authors+ 0 author

11 February 2025

Background/Objectives: Nursing staff turnover can adversely affect nursing home (NH) performance. To address staffing shortages, NHs are increasingly turning to agency nursing staff as a solution. This study examined the relationship between the use...

  • Article
  • Open Access
4 Citations
6,104 Views
10 Pages

Background: Mechanical diagnosis and therapy (MDT) and the stratified approach using the Keele STarT Back Screening Tool (SBST) are examples of stratified low back pain (LBP) management. We investigated whether the medium–high risk in SBST can...

(This article belongs to the Special Issue Innovative Diagnostics Tools in Physiotherapy: from the Laboratory to the Clinical Setting)
  • Article
  • Open Access
2 Citations
1,854 Views
26 Pages

Minute-Cadence Observations of the LAMOST Fields with the TMTS: IV—Catalog of Cataclysmic Variables from the First 3-yr Survey

  • Qichun Liu,
  • Jie Lin,
  • Xiaofeng Wang,
  • Zhibin Dai and ,
  • Yongkang Sun,
  • Gaobo Xi,
  • Jun Mo,
  • Jialian Liu,
  • Shengyu Yan and
  • Jicheng Zhang
  • + 22 authors+ 17 authors

23 August 2024

The Tsinghua University–Ma Huateng Telescopes for Survey (TMTS) started to monitor the LAMOST plates in 2020, leading to the discovery of numerous short-period eclipsing binaries, peculiar pulsators, flare stars, and other variable objects. Her...

  • Article
  • Open Access
65 Citations
40,257 Views
15 Pages

The Healthfulness of the US Packaged Food and Beverage Supply: A Cross-Sectional Study

  • Abigail S. Baldridge,
  • Mark D. Huffman,
  • Fraser Taylor,
  • Dagan Xavier and ,
  • Brooke Bright,
  • Linda V. Van Horn,
  • Bruce Neal and
  • Elizabeth Dunford
  • + 3 authors+ 0 author

24 July 2019

The US food supply is dominated by highly-processed packaged food and beverage products that are high in energy, saturated fat, sugar, and salt. We report results of a cross-sectional assessment of the 2018 US packaged food and beverage supply by nut...

  • Article
  • Open Access
1 Citations
562 Views
27 Pages

Current building energy benchmarking relies on annual Energy Use Intensity (EUI), which cannot detect temporal operational anomalies—such as after-hours equipment operation or irregular scheduling—that represent actionable efficiency oppo...

(This article belongs to the Section Building Energy, Physics, Environment, and Systems)
  • Article
  • Open Access
6 Citations
6,389 Views
15 Pages

22 September 2023

Understanding the movement, direction, and shape of sand dunes can contribute to reducing their impact on infrastructure and the environment. The Rub’ al Khali desert has a distribution of dune types. This study aims to identify and map the dif...

(This article belongs to the Section Remote Sensing in Geology, Geomorphology and Hydrology)
  • Article
  • Open Access
1,548 Views
20 Pages

20 October 2025

Objectives: Urinary tract infections (UTIs) are the most common healthcare-associated infections in Skilled Nursing Facilities (SNFs); they are associated with longer lengths of stay, higher levels of care, increased treatment costs, and higher morta...

  • Article
  • Open Access
19 Citations
7,365 Views
26 Pages

7 June 2023

With the increasing volume of collected Earth observation (EO) data, artificial intelligence (AI) methods have become state-of-the-art in processing and analyzing them. However, there is still a lack of high-quality, large-scale EO datasets for train...

(This article belongs to the Special Issue Remote Sensing and Associated Artificial Intelligence in Agricultural Applications)
  • Article
  • Open Access
7 Citations
2,789 Views
14 Pages

An Application of Ordered Weighted Averaging Operators to Customer Classification in Hotels

  • Pere Josep Pons-Vives,
  • Mateu Morro-Ribot,
  • Carles Mulet-Forteza and
  • Oscar Valero

9 June 2022

An algorithm widely used in hotel companies for demand analysis is the so-called K-means. The aforementioned algorithm is based on the use of the Euclidean distance as a dissimilarity measure and this fact can cause a main handicap. Concretely, the E...

(This article belongs to the Special Issue Aggregation Functions and Indistinguishability Operators: Applications)
  • Review
  • Open Access
31 Citations
16,903 Views
24 Pages

Wind Turbines Offshore Foundations and Connections to Grid

  • Francisco Manzano-Agugliaro,
  • Miguel Sánchez-Calero,
  • Alfredo Alcayde,
  • Carlos San-Antonio-Gómez and ,
  • Alberto-Jesús Perea-Moreno and
  • Esther Salmeron-Manzano
  • + 1 author+ 0 author

Most offshore wind farms built thus far are based on waters below 30 m deep, either using big diameter steel monopiles or a gravity base. Now, offshore windfarms are starting to be installed in deeper waters and the use of these structures—used...

(This article belongs to the Section Inventions and Innovation in Energy and Thermal/Fluidic Science)
  • Article
  • Open Access
310 Views
32 Pages

Freezing of gait (FoG) in Parkinson’s disease is clinically heterogeneous, yet wearable-sensor studies predominantly focus on binary FoG detection. We investigated whether right-ankle inertial signals can characterize clinically meaningful FoG...

(This article belongs to the Special Issue Artificial Intelligence in Bioengineering: Innovations, Challenges, and Future Directions)
  • Article
  • Open Access
1 Citations
2,204 Views
24 Pages

7 November 2025

Buildings account for approximately one-third of global energy usage and associated carbon emissions, making energy benchmarking a crucial tool for advancing decarbonization. Current benchmarking studies have often been limited to mainly the annual s...

(This article belongs to the Special Issue Carbon Emissions Analysis by AI Techniques)