Vol. 79 No. 3 (2026)

Published: 25-03-2026

Full Issue

Table of Contents

Astronomy

BV Photometry of the Ultracompact Binary Star GP Com

Radoslav Zamanov, Lyuba Dankova, Milen Minev, Daniela Boneva, Krasimira Yankova

285–293
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Physics

Nonlinear UV Radiation Gradients Reveal Microclimatic Control in High-Andean Elevations

Angel Canales-Gutiérrez, Marisol Chambi-Alarcon, Nilton Quispe Mamani, Luz Clarita Mamani Yucra, Angélica Edith Huanca Sánchez, Leidy Lizbeth Huarache Gutierrez, Rubinho Ivan Huaranca Arias

294–303
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Spectral Behaviour of Nanosized Materials Nanotubes/Cerium Oxide for UV Protection of Skin

Linyu Wang, Lei Mao, Jingjing Chen, Serhii Brychka, Linmin Qi, Alla Brychka, Beatriz Luci Fernandes

304–311
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Chemistry

Optimization of Solid-phase Extraction and GC-MS/MS Determination of PAHs in Bulgarian Sewage Sludge

Valentina Lyubomirova, Iva Belovezhdova, Alexandra Kamusheva, Petar Ignatov, Petar Tuhchiev

312–320
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Investigation of the Surface Features of $$\bf TiO_2/Sm_2O_3$$ Thin Films Prepared by Sol–gel Method

Stancho I. Yordanov, Bojidar T. Jivov, Vladimir P. Petkov, Yoanna G. Kostova, Vanya L. Dyakova, Mihaela K. Aleksandrova , Shaban R. Uzun

321–330
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Biology

Dactylorhiza romana (Orchidaceae), a New Species in the Flora of Kosovo and Metohija

Vladan Djordjević, Milorad Veljković

331–339
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Geology

A Comparative Analysis of Different Kinetic Models for Calculating Vitrinite Reflectance in Source Rocks for Oil and Gas in the Banat Depression (Serbia)

Nikoleta Aleksić, Nikola Radovanović

340–348
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Engineering Sciences

A High Power Directional Helical Antenna Modelling for Communication and Signal Disruption Operating at 10 MHz

Xiongfei Chi, Ting Wang, Lei Shi, Denys Halapsis, Nataliia Rudenko, Mykola Madinov, Tymur Parashchenko, Pavlo Hlushchenko

349–358
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Medicine

Study of the Lip Morphology in Young Bulgarians

Tsvetanka Petleshkova, Katerina Topalova

359–367
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Coordinated Immunomodulatory and Proliferative Effects of a Polyphenol – bromelain Combination in J774 Macrophages

Tugba Elgun, Yasemin Musteri Oltulu, Halil Ibrahim Arslan, Gul Ipek Gundogan, Enver Ciraci, Esra Nazligul, Asmaa Abuaisha, Gurol Emekdas

368–375
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Measurement of Arterial Blood Pressure by Analyzing the Pulse Wave Transit Time at a Selected Peripheral Point

Stoyan Tanev

376–383
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Der p 1, Der p 2, and Der p 23 Content in House Dust Mite Allergen Extracts in Relation to Their Biological Potency Measured through Standardized Skin Prick Testing

Diana Milcheva, Georgi Nikolov, Bogdan Petrunov

384–389
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Agricultural Sciences

Influence of Some Foliar Fertilizers on the Development of Prista Grapevine Variety

Gergana Kovacheva, Iliana Ivanova, Galina Dyakova, Ralitsa Mincheva, Kristina Dyakova, Stoyan Stoyanov

390–397
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Long-term Effect of Biochar Application on CO$$_{2}$$ Emissions in a Fluvisol

Maya Benkova, Maria Ivanova, Irena Atanassova

398–406
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