Vol. 79 No. 4 (2026)

Published: 27-04-2026

Full Issue

Table of Contents

Astronomy

Four New Ground-based Observations of the Hot Neptune-like Exoplanet TOI-1728b

Nikola N. Antonov

409–415
- Full Text

Mathematics

Existence Results for a Class of Singular Problems Involving p(x)-Laplacian Operator

Zehra Yücedag, Berat Süer

416–428
- Full Text

Chemistry

Nanofiltration as a Sustainable Tool for Concentrating Bioactive Compounds in Mavrud Red Wine

Madlena Lazarova, Maria Dencheva-Zarkova, Dragomir Yankov, Julia Genova

429–437
- Full Text

Biology

Pterophylla (Cunoniaceae) – a New Genus for the Fossil Flora of Bulgaria

Vladimir Bozukov, Ognyan Todorov

438–444
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The First Discovery of the Pollinators and Visitors of Gymnadenia frivaldii (Orchidaceae) on the Balkan Peninsula

Ana Nahirnić-Beshkova, Igor Shamshev, Miroslav Barták, Vladan Djordjević

445–451
- Full Text

Engineering Sciences

Drone Airframe Acting as a Magnetic Loop Antenna

Svetoslav Zabunov, Garo Mardirossian

452–460
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Influence of Deep Cryogenic Treatment on the Mechanical and Plastic Properties of AlMg4.5 Aluminium Alloy

Plamen Stoyanov, Daniela Spasova

461–467
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Influence of the Auto-Unloading System on the Rotor Axial Oscillations

Lu Congxiang, Serhii Shevchenko, Oleksandr Yurchenko, Ihor Shostakivskyi, Yana Kovalenko, Oleksandr Bahinskyi, Oleksandr Levkivskyi

468–478
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Corrosion Resistance and Wettability of Selective Plated Copper-based Coatings Containing Silver Particles

Radostina Yankova, Ivan Rusev, Ina Koleva, Deyan Veselinov

479–488
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Integrated Monitoring and Performance Analysis of Off-grid Photovoltaic Systems Using MPPT Controller, SmartShunt, and Temperature Sensors

Dinko Stoykov

489–497
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Medicine

Correlation between Health-related Outcomes and Perceived Social Support in Patients with Mild and Moderate Burns: A Cross-sectional Study

Xin Xu, Yafei Zhao, Jingpo Li, Na Wang, Xiaohui Ning

498–503
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Laboratory Parameters and ALBI Score for Assessing Severity of Alcoholic Hepatitis in Cirrhotic Patients

Miroslava Ivanova Mihaylova, Strahil Asenov Strashilov

504–511
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Anger State Assessment of Victims of Intimate Partner Violence

Hanım Gökçe Arslan, Hacer Yaşar Teke, Uğur Koçak

512–519
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Changes in Salivary 8-iso-Prostaglandin F2α after Six Months of Orthodontic Appliance Wear: A Prospective Paired Study

Stefani Doshkova, Desislav Tomov, Iliyana Stoeva

520–527
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Agricultural Sciences

Effect of Organo-mineral and Organic Fertilization on the Productivity of Common Wheat (Triticum aestivum L.)

Nikolay Tsenov, Margarita Nankova

528–536
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Botanical Composition and Quality of Forage in Self-seeded Grasslands of Festulolium in Mountain Conditions

Tatyana Bozhanska, Biser Bozhanski

537–544
- Full Text