DSpace 7

DSpace is the world leading open source repository platform that enables organisations to:

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Recent Submissions

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Contribution to the Tachinids (Diptera: Tachinidae) of Vietnam
(Plovdiv University Press "Paisii Hilendarski", 2026-02-05) Hubenov, Zdravko
The tachinid fauna of Vietnam has not been studied. Totally, 37 species of the family Tachinidae beloning to 32 genera and 4 subfamilies have been recorded. Their distribution is analysed and an areographical characteristic of the species is presented. Five species are endemics. The tachinids belong to 25 zoogeographical categories. The species (27 species - 73.0%) distributed in the Oriental and Palaearctic Regions are predominant. The most widely distributed are 7 species (18.9%), represented in 3 zoogeographical areas.
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Species of the family Lumbricidae (Oligochaeta) found in uranium mining areas in Bulgaria
(Plovdiv University Press "Paisii Hilendarski", 2026-01-08) Tsekova, Ralitsa; Sakelarieva, Lidia
This paper presents the list of earthworms found in five affected by the uranium mining activities areas in Bulgaria. For the whole period of study (2011-2016) ten species belonging to six genera of family Lumbricidae were recorded. The genera Aporrectodea and Lumbricus were represented by 3 species each, and the other four by one species only. Half of all registered earthworms were endogeic. Three species (Aporrectodea rosea, Eisenia fetida and Octolasion lacteum) were found in all sampling sites.
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Studies on free-living freshwater nematodes from Skadar Lake Montenegro
(Plovdiv University Press "Paisii Hilendarski", 2026-01-12) Stoychev, Stefan
Hydrobiological studies of Skadar Lake, Montenegro were performed in 2014. The present study provides the first information on free-living freshwater nematodes from Skadar Lake, Montenegro. In our study, we identified 15 species of freshwater free-living nematodes belonging to 11 genera. This is the first detailed study on free-living freshwater nematodes from the Skadar Lake, Montenegro. The identified 15 species and 11 genera are new to the hydrofauna of Montenegro.
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Contribution to the Tachinids (Diptera: Tachinidae) of Vietnam
(Plovdiv University Press "Paisii Hilendarski", 2026-01-08) Tsekova, Ralitsa; Sakelarieva, Lidia
This paper presents the list of earthworms found in five affected by the uranium mining activities areas in Bulgaria. For the whole period of study (2011-2016) ten species belonging to six genera of family Lumbricidae were recorded. The genera Aporrectodea and Lumbricus were represented by 3 species each, and the other four by one species only. Half of all registered earthworms were endogeic. Three species (Aporrectodea rosea, Eisenia fetida and Octolasion lacteum) were found in all sampling sites.
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Alkyd resins on the base of waste poly(ethylene terephthalate) and glycerol phase from biodiesel production
(Plovdiv University Press "Paisii Hilendarski", 2026-01-10) Todorov, Nikola
One of the most significant environmental challenges in the modern world is the proper management of wastes and by-products. In the present work, we report the results from our research on the possibility of obtaining alkyd resins based on two waste products - poly(ethylene terephthalate) (PET) beverage bottles (among the highest-volume wastes in landfills) and the organic substances of the glycerol phase, obtained as a by-product in the canola oil biodiesel production. After treatment with potassium hydroxide and subsequent neutralization, from the organic substances in the glycerol phase, canola oil fatty acids and crude glycerol (80.6% purity) have been obtained. Two PET glycolysis were carried out by the crude glycerol at two different glycerol/PET ratios. A total of three medium oil alkyds were obtained - two based on PET glycosates, canola oil fatty acids and phthalic anhydride, and one reference alkyd based on canola oil, glycerol, phthalic anhydride, and ethylene glycol. The syntheses were carried out using microwave irradiation. Films from all alkyd resins were prepared, and their physical properties, thermal stability, and chemical resistance were investigated. Results showed that the drying time, hardness, abrasion resistance, thermal stability, and chemical resistance of the PET modified alkyd resins are better than those properties of the reference alkyd resin.