E. V. Todorova

Reagent-Assisted Phytoextraction Potential for Heavy and Critical Metals on a Contaminated Post-Mining Substrate as NBS

Petar Petrov, Венета Стефанова, Yana Daskalova, E. V. Todorova et autres

Restoring contaminated and degraded land, including post-mining sites, industrial areas, and urban brownfields, is central to sustainable land management, and nature-based solutions (NBSs) such as phytoextraction can combine soil remediation with wider landscape-restoration goals. This screening-stage pot study evaluated how three mobilising …

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Influence of the Spent Coffee Ground-to-Ammonium Lignosulfonate Ratio on the Performance of Wood-Fiber Biocomposites

Viktor Savov, Petar Antov, Alexandrina Kostadinova-Slaveva, E. V. Todorova et autres

Spent coffee grounds (SCGs) and ammonium lignosulfonate (ALS) are promising renewable constituents for wood-fiber biocomposites, but the effect of their relative proportion within the binder phase remains insufficiently understood. This preliminary study evaluated wood-fiber panels produced at a constant dry-matter matrix-to-fiber ratio …

bg, gr, my (code pays fourni par la source)

Synthesis and Antimicrobial Evaluation of Chlorinated Chalcone Derivatives

Yordanka Ivanova, Trayana S. Nedeva, Iliyana Kirilova Rasheva, Stanimira T. Ivanova et autres

A series of chlorinated chalcone derivatives containing oxazole and thiazole rings were synthesized via Claisen–Schmidt condensation of 6-acetyl-2(3H)-benzoxa(thia)zolone with substituted chlorobenzaldehydes. The synthesized compounds were evaluated for their antimicrobial activity against selected bacterial and fungal strains. Several compounds demonstrated moderate antimicrobial activity …

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Structure–Property Relationships of Hot-Pressed Wood–Polymer Composite Boards from Recycled ABS Edge-Banding Waste and Wood Fibers

Viktor Savov, Petar Antov, Alexandrina Kostadinova-Slaveva, E. V. Todorova et autres

Recycled thermoplastics offer a promising route for valorizing industrial residues and developing thermoplastic-bonded wood-based panels without added formaldehyde-based resins. In this study, experimental wood–polymer composite boards were produced from recycled acrylonitrile–butadiene–styrene (ABS) edge-banding waste used as the polymer matrix and industrial wood …

bg, gr, ru (code pays fourni par la source)

Aesthetic Profiling and Exploratory Composting Screening of Wood-Fiber Biocomposites Bonded with Spent Coffee Grounds and Ammonium Lignosulfonate

Aleksandrina Kostadinova-Slaveva, Viktor Savov, Petar Antov, Boyka Malcheva et autres

Spent coffee grounds (SCGs) and lignin-derived binders, such as ammonium lignosulfonate (ALS), are increasingly being explored as renewable resources to reduce reliance on conventional formaldehyde-based resins in wood-fiber biocomposites. Although prior work has shown that SCG-ALS adhesive systems can achieve promising mechanical …

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Circular Economy Pathways for Pharmaceutical Packaging Waste in Wood-Based Panels—A Preliminary Study

Alexandrina Kostadinova-Slaveva, E. V. Todorova, Viktor Savov, Savina Brankova

This preliminary study investigates a direct, non-delaminated route to valorize multilayer pharmaceutical sachet offcuts (comprising paper/plastic/aluminum) as partial substitutes for wood fiber in wood-based panels. Milled offcuts were incorporated at 10, 20, and 30 wt% (control: wood only). Laboratory mats were hot-pressed …

bg (code pays fourni par la source)

Features of Structural Changes in the Amorphous Alloy Al85Ni5Fe7La3 under Xenon Ion Irradiation

Natalia Dmitrievna Bakhteeva, Alexandr N. Nechaev, V. K. Semina, O. V. Rybalchenko et autres

Abstract The structure and thermal stability of the amorphous alloy Al85Ni5Fe7La3 in the initial rapidly quenched state and after xenon ion irradiation with energy of 167 MeV in the range of fluence values of 1012–2 × 1014 ions/cm2 were studied. On the …

ru (code pays fourni par la source)

Development and Characterization of Sustainable Biocomposites from Wood Fibers, Spent Coffee Grounds, and Ammonium Lignosulfonate

Viktor Savov, Petar Antov, Alexsandrina Kostadinova-Slaveva, Jansu Yusein et autres

Coffee processing generates large volumes of spent coffee grounds (SCGs), which contain 30–40% hemicellulose, 8.6–13.3% cellulose, and 25–33% lignin, making them a promising lignin-rich filler for biocomposites. Conventional wood composites rely on urea-formaldehyde (UF), melamine–urea–formaldehyde (MUF), and phenol–formaldehyde resins (PF), which dominate …

bg (code pays fourni par la source)

Advancing Plastic Waste Management for a Circular Economy: Comparative Insights from Plovdiv (Bulgaria) and Kostanay (Kazakhstan)

E. V. Todorova, Gulnara Yunussova, Xeniya Formazyuk, Aleksandrina Kostadinova-Slaveva et autres

Plastic waste management is a critical challenge worldwide, influenced by the socio–economic conditions and policy frameworks of individual countries. This study evaluates the plastic waste management practices in two cities, Kostanay, Kazakhstan, and Plovdiv, Bulgaria, through a comparative analysis of household waste …

bg, kz (code pays fourni par la source)

Features of structural changes in the amorphous alloy Al85Ni5Fe7La3 under xenon ion irradiation

Natalia Dmitrievna Bakhteeva, Alexandr N. Nechaev, V. K. Semina, O. V. Rybalchenko et autres

The structure and thermal stability of the amorphous alloy Al85Ni5Fe7La3 in the initial rapidly quenched state and after xenon ion irradiation with 167 MeV energy of in the range of fluence values 1012 – 2·1014 ions/cm2 were studied. Based on the modeling …

Structure of Al82Cu7Fe11 Alloy After High-Speed Quenching

Natalia Dmitrievna Bakhteeva, E. V. Todorova, P. P. Umnov, T. R. Chueva et autres

Abstract Using structural analysis methods (metallographic, X-ray diffraction, differential scanning microscopy), a comprehensive study of the structure of Al82Cu7Fe11 alloy, obtained in the form of ribbons by the melt spinning method, was carried out. It is shown that a multiphase amorphous-nanocrystalline structure …

ru (code pays fourni par la source)

Panoramic Semiquantitave Analysis for Multielement Characterization of Liquid and Solid Waste Samples

Valentina Lyubomirova, Iva Belovezhdova, Rumyana Djingova, Petar G. Petrov et autres

Wastewater treatment results in large amounts of sewage sludge in the wastewater treatment plant (WWTP) which imposes on its reuse. The most promising application is as a fertilizer in agriculture which is regulated by national and European legislation. Along with the mandatory …

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