Olena Bilous - Academia.edu (original) (raw)

Papers by Olena Bilous

Technical Sciences and Technologies

One of the directions of modern capital buildings is reduce the cost of manufacturing constructio... more One of the directions of modern capital buildings is reduce the cost of manufacturing construction products and increase the reliability of its basic elements. In order to reduce the production time, manufacturing construction products should be made of flat reinforced concrete elements connected to the spatial structure by cables.Due to the reduction of the amount of time for the production of the main elements of construction, it becomes possible to produce materials of low weight for the overlapping with the specified dimensions in the plan of structure. The main factor of safe operation is the calculation of the nodes connecting the cable ropes to structure.Analysis of recent achievements and publications has shown that the problem of determining the stress-strain state of the cable rope is not solved, in the scientific literature insufficiently studied the effects of nodes on the state of the entire prefabricated structure.The aim of the article is study the influence of defect...

Journal of Geology, Geography and Geoecology, 2021

Lake Telbyn is considered to be one of the largest lakes located in the eastern part of Kyiv. The... more Lake Telbyn is considered to be one of the largest lakes located in the eastern part of Kyiv. The artificial aeration of this lake was started at the end of 2016 by using of 8 aerators, which has been continuing so far. The main perpose of this measure is improving the ecological state of the lake mostly for recreational use. There were carried out a field study of the lake and the analysis of remote sensing data. Physical and chemical characteristics of water, phytoplankton biomass, chlo- rophyll a concentration and some other parameters at the different depths were studied. It was found out that artificial aeration has a positive effect on the ecological state of the lake. The water aeration causes the blur of thermocline whereas the impact on its depth is not essential. Under impact of aeration the concentration of dissolved oxygen become larger, mostly in the bottom layer. The highest concentration of ammonium nitrogen in a warm period is observed in the bottom layer of the lake...

Water, 2021

The river basin of Siversky Donets is of great scientific interest since this river runs through ... more The river basin of Siversky Donets is of great scientific interest since this river runs through a territory with heavy industry (in particular, coal mining, chemical processing and metal industries). Within the basin, rivers of different sizes were explored (small, medium, large and extra-large) that flow through siliceous and calcareous rocks on the same elevation (lowland—below 200 m a.s.l.). Phytoplankton, as one of the Biological Quality Element, was used to perform the assessment of ecological status of the water bodies within the Siversky Donets river basin in 2019. The state monitoring program based on the updated approaches has been implemented in the river basin for the first time. The composition of phytoplankton species in the basin comprised 167 species (168 intraspecies taxa), mainly Bacillariophyta (63%) and Chlorophyta (22%) with the presence of other species (Cyanobacteria, Charophyta, Chrysophyta, Dinophyta and Euglenophyta). High species diversity and divisions am...

The species diversity of algae in different ecotopes of the alpine lake Nesamovyte was studied. I... more The species diversity of algae in different ecotopes of the alpine lake Nesamovyte was studied. In total, 233 species were identified comprising globally and regionally rare species. We also documented a temporal change in species composition from the first investigations conducted 100 years ago to present. An increase in the species diversity of Bacillariophyta and Chlorophyta, the constancy of the number of Euglenophyta and Cyanoprocaryota species, a decrease in the composition of Charophyta and the disappearance of Dinophyta species were revealed. We further documented some changes in the most abundant species and indicator species for certain limnological conditions, the disappearance of montane species and the colonization of species with a wide ecologicalgeographical amplitude. Benthic and plankton-benthic conditions became dominant and indicators of low-alkaline mesotrophic waters as well as mass development (“blooming”) of some species increased. The studied features of the ...

Diversity, 2021

The species diversity and changes in the structural dynamics of the algal flora from the alpine l... more The species diversity and changes in the structural dynamics of the algal flora from the alpine lake Nesamovyte has been studied for 100 years. During the period of investigations, 234 species (245 infraspecific taxa) were revealed to cover more than 70% of the modern species composition of the studied lake. The modern biodiversity of algae is characterized by an increase in the number of widespread forms, a change from the baseline “montane” complex in comparison to the beginning of the 20th century. Nevertheless, the Nesamovyte Lake still has a unique algae composition that is typical for high-mountainous European lakes. The presence of a different complex of conventionally arctic species of algae, in particular, diatoms is discussed. Structural changes in the taxonomic composition of the algal flora of the lake as well as in the complex of the leading genera, species and their diversity are revealed. An ecological analysis of the algal species composition of the lake showed vulne...

Plant and Fungal Systematics, 2019

A study of green and charophytic algae diversity in two high-mountain lakes in the Eastern Carpat... more A study of green and charophytic algae diversity in two high-mountain lakes in the Eastern Carpathians (Ukraine) identified 99 species (109 taxa at species and intraspecific rank) in 35 genera from different ecotopes of the studied lakes. Algal species composition was characterized, and the ecological parameters of the lakes were determined from monitoring data recorded over the last century. Environmental analyses using bioindication methods based only on data on the composition of green and charophytic algae confirmed that the environmental inferences were accurate. Degradation of the Nesamovyte and Brebeneskul lake ecosystems, as compared with their earlier states, was noted.

Water Environment Research, 2018

The objective of the present work was to study the structure of epiphyton in water bodies signifi... more The objective of the present work was to study the structure of epiphyton in water bodies significantly differing in the degree of their contamination. In the studied water bodies, the concentration of ammonia (NH þ 4 À N) accounted for 0.04-74.00 mg/L; nitrite (NO À 2 À N), 0.002-1.750 mg/L; nitrate (NO À 3 À N), 0.13-58.00 mg/L; inorganic compounds of phosphorus (P inorg), 0.041-0.272 mg/L; chloride (Cl-), 34.5-560.5 mg/ L; whereas the content of organic matter (DO) was 18.0-81.0 mg O/L. The numbers of algae were determined by a direct count. Biomass was calculated by the count cell volume method. The Generic Diatom Index, the Pantle-Buck saprobic index, and the Shannon index of species diversity were used to analyze algal community structure. This study found that epiphyton responded to heavy pollution with changes in its species richness, taxonomic structure, species composition, quantitative indices, numbers and biomass structure, dominant complex, and ecological spectrum. Water Environ. Res., 90, 706 (2018).

Ecohydrology & Hydrobiology, 2016

Fundamental and Applied Limnology, 2014

ABSTRACT An environmental assessment of the Southern Bug River was performed by using statistical... more ABSTRACT An environmental assessment of the Southern Bug River was performed by using statistical approaches to evaluating major environmental variables such as phytoplankton community composition and hydrochemical data for bio-indication. Chlorophyta (44.9 %) and Bacillariophyta (22.0 %) algae prevail in species number among 287 infraspecies taxa of nine taxonomical divisions. Comparison of the middle reaches of the Southern Bug River with its upper reaches revealed a decreasing number of euglenoid species, and showed characteristic features for a phytoplankton community dominated by green algae as well as diatoms similar to other large European rivers. Bio-indications show that the studied part of the river had low-alkaline and fresh, slow streaming and middle-oxygenated waters, and represented Classes I–III of water quality reflecting oligo- to mesotrophic states as found in the upper part of the river. The species richness in the middle stations decreased in species number, i.e., a loss of mostly euglenoids, and dominance of green algae and diatoms typical for the Dnipro, Danube, and other large regional rivers. Fluctuation of abundance and bio-volume variables was very similar (Pearson correlation: 0.748). Studied parts of the river can be divided into three different sections as a result of statistical comparison based on hydrochemistry and phytoplankton community similarity: from Pyatnychany to Sabariv, from Sabariv to Dzhulynka, and from Dzhulynka to Pervomaysk. Species richness and the Shannon index fluctuated similarly with opposite trend lines of the Saprobity Index. The central section of the studied part of the river was under nitrate impact as Redundancy analysis (RDA) revealed. Mean cell volume increases down the river where the phytoplankton community is enriched in the large-celled algal species, attesting to the health of the ecosystem improving in the same direction. The ability of the ecosystem to self-purify was found to be high and increases downstream in spite of the anthropogenic impact in middle stations. Our studies allowed us to recommend three stations, Sabariv, Dzhulynka and Pervomaysk, for subsequent monitoring.

Transylvanian Review of Systematical and Ecological Research, 2013

A total of 98 taxa of algae were observed in phytoplankton, sampled monthly, from the Khmelnitsky... more A total of 98 taxa of algae were observed in phytoplankton, sampled monthly, from the Khmelnitsky monitoring station in the Southern Bug River, Ukraine, between April 2010 and March 2011. Chlorophyta species are the richest taxonomic group with 46 taxa, followed by Bacillariophyta, Euglenophyta, Cyanoprokaryota, Dinophyta, Chrysophyta, Streptophyta, and Xanthophyta. Seasonal dynamics of species distribution in taxonomic divisions shows that the role of Bacillariophyta in communities was high in January-March, which were replaced by greens in March-September. Euglenoids were developed in February-December and bluegreen algae in summer communities only. Strong positive correlations between temperature and species richness was observed. Abundance and biovolume of phytoplankton were maximal in summer, caused mostly by Dolichospermum flos-aquae (Lyngb.) Wacklin, Hoffmann and Komarek and Ceratium hirundinella (O. Müll.) Bergh. The river ecosystem has two periods of trophic levels - high a...

Ecohydrology & Hydrobiology, 2012

We conducted an environmental assessment for the fi rst time in the upper reaches of the Southern... more We conducted an environmental assessment for the fi rst time in the upper reaches of the Southern Bug River utilizing data on phytoplankton communities and hydrochemistry. Chlorophyta (40%), Bacillariophyta (19%), and Euglenophyta (18%) were among nine identifi ed divisions of common phytoplankters which included 281 taxa. The results of a statistical comparison of species richness showed that the investigated part of the river can be divided into two parts for follow-up monitoring. Class II-III waters refl ect a trophic status equivalent to an oligo-to meso-trophic state. Using algal indicators as well as environmental variables and statistical methods we identifi ed major factors impacting the algal communities, such as phosphate and ammonia.

Diversity

The Sasyk Reservoir is one of the largest seaside reservoirs in Ukraine, artificially maintained ... more The Sasyk Reservoir is one of the largest seaside reservoirs in Ukraine, artificially maintained as a freshwater area including various floodplain areas. The Reservoir originated from an estuary to now being an almost freshwater reservoir. The diatoms (Bacillariophyta) in benthos were investigated for analyzing the coastal zone diversity of the Black Sea inside the borders of Ukraine. The indicated diatom composition was formed by 97 species (100 infraspecies taxa). Some rare marine and freshwater taxa were noted, as well as three species reported in Ukrainian territory for the first time (Navicula vandamii Schoeman et R.E.M. Archibald, Sellaphora difficillima (Hustedt) C.E. Wetzel, L. Ector et D.G. Mann, and Mastogloia laterostrata Hustedt). The bioindicative characteristics of the diatom composition testified to the freshwater condition of the reservoir. Changes to the salinity level of the Sasyk Reservoir were exposed due to the composition of benthic diatoms. The presence of mes...