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Bulgaria was integrated with the European Vertical Reference System (EVRS) in 2003 through the connection of the State Levelling Network (SLN) of Bulgaria to the United European Levelling Network (UELN) and Bulgaria's participation in the European Unified Vertical Network Densification Action project. The SLN of the Republic of Bulgaria is connected to the UELN and consequently to the EVRS through the last completed IIIrd realization of the SLN Class I, which was completed in 1984. In 2010, the Ordinance No. 2/30....

Antibacterial preparations are widely used in agriculture worldwide to achieve a wide range of effects, including therapeutic and preventive ones; they are also used as forage additives to stimulate animal growth. Since the issue related to the development of antibiotic-resistant microorganism strains has become vital, the use of antibiotics in agriculture is strictly regulated. Thus, in the European Union (EU) countries and Eurasian Economic Union (EAEU) countries, antibacterial preparations can be used in treatm...

Calculation of normal heights and differences from known geopotential numbers and differences in geodetic practice is required when performing independent calculations: for control of levelling network adjustment made with different type heights – normal and geopotential; when using optical clocks technology for geopotential difference determinations; when performing precise engineering and geodetic works. It is well known that between two height types - normal heights and geopotential numbers exists theoretical e...

The present paper aims to investigate the opening up of the forest complex Maries -Limenaria of the island of Thassos in Greece and its environmental impacts. Firstthe study of the conditions of the forest road network of the mountain forestcomplex of Maries-Limenaria was done, then the assessment of the environmentalimpacts of the opening up of the above-mentioned complex, by investigating theintensity of the above impacts on the natural environment and the ability of theforest ecosystem to absorb these impacts o...

Buildings consume a large quantity of energy owing to their constant operation and long lifespan. Building-energy simulations are an important element of the decision-making process because they allow designers to examine the energy and comfort effects of various building design alternatives. In hot and arid climate conditions, cooling tends to dominate building thermal energy use. Cooling loads can be reduced through the adoption of efficient building envelope materials. This study investigates the optimal thickn...

The purpose of the study is to find the optimal ratio of the equity and debt capital for one of the enterprises of the Russian coal industry using proposed optimization model of the capital structure. In the recent years Russian coal companies endured external and internal challenges connected with access restrictions to the international capital markets due to sanctions and tightening environmental regulations, as well as all time relevant problems of increasing returns and economic benefits from equity capital. ...

The objective of this research is to optimize the volume of laboratory tests of physical and mechanical properties of soil. Today, the solution to geomechanical and mining technological problems has the form of functional or statistical relationships, reasoned by the physical parameters of soils (density, moisture, strength properties, acoustic indicators, etc.). The calculations use the average values or estimates of these parameters obtained from statistical processing of multiple laboratory or field test data. ...

Traffic congestion is an important problem in transport systems. The reason for traffic jams is the growing number of vehicles. It is objective and irreparable. Many roads do not have the ability to separate at different levels and have to cross. Most intersections use traffic lights to regulate traffic. Traffic light regulation is a non-stationary, non-linear problem under conditions of uncertainty. Most traffic lights nowadays use fixed time intervals. It is necessary that traffic lights monitor traffic flows at...

The rapid development of agricultural sector is becoming the main factor leading to continuously increasing of specific pollution of surface water. The aim of this study was to assess the selected parameters of oxidative stress in zebrafish (Danio rerio) after their exposure to environmental realistic concentrations of roundup and chlorpyrifos during 14 days. Our results confirm that roundup and chlorpyrifos in the environmentally relevant concentrations promote oxidative stress in zebrafish liver. In particular, ...

Oxyethylated compounds are used as reagents-regulators in the flotation of non-sulfide ores, in particular, apatite ores. Thus, the necessary degree of selectivity in the flotation separation of two calcium minerals of apatite and calcite is achieved only by using, in addition to a collector, regulators-reagents from the nonylphenol ethoxylates class. In order to establish the most optimal structures, this paper presents a comparative assessment of the physical-chemical and flotation properties of several classes ...

The authors were the first to study the main parameters of the mineral metabolism of plants that grow in the Plast Region of the Chelyabinsk Oblast in biogeocenosis with different technogenic impact. The study included the samples of plants taken from the surface of the Novotroitsk tailing dump of the gold-arsenic deposit and similar samples from the reference areas (>15 km from the technogenic formation). The samples of spring sedge (Carex praecox), feather grass (Stipa pennata), poison hemlock (Conium maculatum)...

The intensive development of remote sensing and unmanned aerial vehicles, and the accessibility of small drones, provide excellent opportunities for shallow water bathymetric surveys on the northern Bulgarian Black Sea coast. The combination of erosional/abrasional and depositional natural coastal types allows testing and assessing the efficiency of aerial surveys for bathymetric mapping. The Bay of Chernomorets is an excellent opportunity to combine data from single-beam sonar, multi-beam sounding and shooting wi...

In the area of transport infrastructures, spontaneous vegetation is exposed to a considerable safety risk and combated by chemical or mechanical means [1]. Glyphosate is one of the most widely used agents worldwide. Glyphosate is harmful to the environment and to health; As a result, alternative and environmentally friendly solutions are being researched in many places [2]. As part of the research project Green Logix of the Carinthia University of Applied Sciences, an analysis of the plant growth with different ro...

Climate change is having a major impact on the agricultural sector, affecting crop phenology and yields. The spring barley is one of the three major crops in Baltic region. The study has analysed the phenological phases of spring barley (Hordeum vulgare), evaluating the onset of three phases, sowing, heading and fully ripe, and the duration between phases over a near century (1928–2019) in Priekuli, Latvia. We have evaluated application of a phenological model for different varieties of spring barley. Air temperat...

This article aims to present the process of obtaining the modern photogrammetric products such as orthophotomap, digital terrain model, regarding surface mining in open pit mining and quarries. The authors also want to present current technologies in photogrammetry, data processing using graphics stations and digital processing of data obtained by using UAV systems with a fully integrated RTK module that provides real-time centimetric position information to achieve very high accuracy of meta-information in images...

The research was conducted to find out if lately found on market eco and bio friendly dishwashing products affect commonly known phytoremediation plants less than most poular chemical dishwashing products. There was chosen one - most popular, and four dishwashing products that position themselves in market as extremely eco and bio friendly. Dishwashing products were made in 3 solutions – 1.0ml, 2.5ml and 5.0ml of product in 100ml of water. Three species of known phytoremediation plants were taken – Sinapis sp., Se...

Sewerage networks form an integral part of urban infrastructure. It is necessary to reconsider the outdated concept of sewer networks and rainwater management in cities that do not meet sustainable development ideas. The new understanding of rainwater management needs to be adapted to the new environmental conditions caused by climate change. The occurrence of pluvial floods has recently become an increasingly common phenomenon. The reasons are outdated sewer networks, rapid urbanization, an increase in impervious...

The article analyzes the political characteristics of the federalization of powerful countries of the world. In this paper, we have tried to highlight the advantages and disadvantages of federalization and the impact mass media on the sovereignty and independence of the state, including the case of the Republic of Germany. This includes identify and show the influence of federalization on the political, cultural and economic orientation of the regions. It is confirmed that the strategic national interests of Ukrai...

Recently, there have been cases of lower durability related to concrete pavements in the transport infrastructure in the Czech Republic. One of the main causes seems to be the increased amount of alkalis in the concrete, which may not have come only from individual components or through winter maintenance. This paper describes a research activity which deals with possibilities of alkali attack from the surrounding environment. The pilot testing provides valuable information on alkalis concentrations in real condit...

The article discusses the possibility of using permanganate oxidizable carbon (POxC, active carbon) as a comprehensive indicator for assessing the state of oil contaminated soils and bottom sediments. POxC has recently emerged as a standardized indicator of active, labile carbon within soil quality frameworks. According to the study, the application of this indicator of the ecological wellbeing of water body is possible since bottom sediments and soils are complex natural biogeochemical barrier zones. Bottom sedim...

Many studies confirm a shift to warmer climate in South East Europe. In Bulgaria, warming trends have been registered since the end of the last century, and different scenarios show increased air temperatures in the future. In the face of climate change, it is a challenge to assess its effect on water resources. The aim of the paper is to evaluate the possible impact of climate change on the discharge of two springs from the Lovech-Tarnovo karst basin. This study uses the monthly water balance method to compare th...

The UNESCO Global Geopark network is expanding. Geoparks are intended to play important roles in sustainable development. For this to happen, new sites geopark establishment need to be carefully evaluated. In addition, protection and maintenance of heritage and sustainability within established geoparks requires effective monitoring. Modern geographic information system (GIS) technologies have a lot to offer for effective landscape-scale assessments and monitoring of geo park territories. However, little attention...

Green roofs can provide a number of benefits in urban areas, including mitigation of heat islands, reduction of urban air pollution, CO2 sequestration, noise reduction, water retention, absorption of pollutants in rainwater runoff, acid rain buffering, etc. The aim of the study is to map the land cover and assess some of the potential benefits of retrofitting green roofs in a residential area in Plovdiv, Bulgaria. The survey covers Yuzhen (South) Quarter, with an area of 31.33 ha. According to the General Developm...

Stock market in Latvia necessitates to be increased in size to attract more investors and encourage economic development. The opportunity for stock market’s enhancement are registered companies in Latvia. What is the landscape of Latvian registered companies and weather, there are enough companies with financial profile having potential for stock market listing, that is the question to be assessed by the authors, comparing those companies’ financial profile to the average Baltic States and Nordic countries stock m...

It is widely known that oil production processes do not usually achieve maximum efficiency. One method of increasing production is microbial enhanced oil recovery (MEOR). MEOR methods can clean oil, increase production and clean oil-contaminated soils by not only introducing the microorganisms themselves but also the substances they produce. Among the advantages of these methods are their relative efficiency and the absence of negative impact on the environment. MEOR methods are divided into two groups the first g...

The study is aimed at attempting to supplement and justify methodological approaches to rating and indicator assessment of the environmental attractiveness of industrial environmental marketing in the metallurgical complex. The relevance of this study is based on the state of the global ecosystem, in which irreversible processes are taking place. The metallurgical industry ranks second among all industries in terms of emissions of harmful substances into the atmosphere. Environmental safety requirements for the me...

Large scale infrastructure construction projects and industrial activity including mining, energy and manufacturing usually involve complex trade-offs on competing land-uses. As a result, often industrial and construction initiatives lead to biodiversity loss. Regional and landscape scale planning may be used to minimise negative impacts on natural ecosystems, thereby contributing to achievement of the United Nations (UN) Sustainable Development Goals. Modern geographic information systems (GIS) and information te...

The Covid-19 pandemic has produced another era on the planet while we sort out the outcomes in various parts of our everyday life. The food sector and food supply chain do not incorporate an exception. In Latvia, the agricultural and food sector is important for the national economy; therefore, it is important that production, processing, logistics, supply and trade disruptions are successfully overcome during the pandemic and the food sector develops rapidly after the crisis and is more resilient in the future. T...

Biofilms on exterior plasters deserve an attention as they affect not only the aesthetical appearance of buildings, but also their hygric and thermal performance that can subsequently results in an initiation of degradation processes. Understanding of biofilms growth mechanisms can be therefore efficiently exploited to avoid such conditions that are convenient for their propagation. This paper therefore combines experimental and computational techniques to predict the biofilms growth rate on lime plasters when exp...

Miyawaki-forest technique is a worldwide used method to create forest quickly in urban conditions. Akira Miyawaki is a Japanese botanist and professor, who invented this technic since 1980. The method takes its inspiration from nature, what means that 15-30 different species of trees and shrubs are densely planted together in a slightly small area. The first Hungarian adaptation of Miyawaki-forest was introduced by the FOKERT in Taban on 20th May 2021. Forest planted with nine tree species (Acer platanoides, Acer ...

Based on the palynological analysis of the bottom sediment column of the arctic lake with the code name K1 of the Yerkuta river basin from the southwestern part of the Yamal Peninsula, we received a preliminary information on climatic changes, as well as on changes in vegetation character in the area around the water body. Reconstruction of vegetation around the lake has identified the development of a brush-grass-moss tundra. Shrubs are represented by Betula sect. Nana, Alnaster, Salix sp., Ericaceae. Herbaceous ...

The future of the energy industry has been one of the most important problems in both domestic and world politics for many years. This is due to the legal conditions relating directly to the energy sector, resulting from the climate and energy policy focused on actions in the field of climate protection. Poland is a unique country in comparison to other European Union countries, the energy balance of which mainly, because in over 86% of the electricity produced, comes from hard coal and lignite. This unique and un...

At the present stage, as a result of the spread of the COVID-19 pandemic in the world in Ukraine, the development of domestic tourism, recreational and excursion activities has intensified, which leads to the study of the tourism and recreation industry at the regional level. A comprehensive analysis of the tourism and recreation industry of the Zaporizhzhia oblast allows to identify problems of its development and operation: uneven location of tourism and recreation enterprises, which are concentrated in the most...

This article will present the main problems related to the reaction of the regional economy during the pandemic COVID-19 in the Republic of Bulgaria. The focus of the study is on the response of the regional economy, as it provides immediate protection against the direct risks to the lives of the local population, such as the spread of disease, the fight against rising unemployment or the deepening of poverty, especially in the smaller settlements, which are at the same time lagging regions. The development of a w...

National statistic is the most important tool for gathering information. It helps us to be analyzed on the national and local level. As a vital resource statistical information for water is the most important for predicting its supply and demand. Another aspect of water analysis is water using for both industrial and household purposes. Last but not least is water wastage. All of these aspects are vital for the Bulgarian cases because of information lack. Last year Bulgaria was faced with big water problems all ar...

The Bulgarian northern Black Sea coast is affected by many landslides. Several geodynamic networks have been built to study landslide processes in the northern Black Sea coast. Landslide research is important, as these phenomena can lead to great material damage. Their destructive impact on buildings, engineering structures and disturbances in the resilience of the earth's crust causes enormous economic, environmental, social and other damage, and often takes human lives. A modern tool for monitoring landslides is...

In Russia, petroleum and petrochemical sectors are closely related: most leading hydrocarbon exploration companies own installations producing organic substances and polymers for the domestic and international markets. Recent transition of Russian economy to Best Available Techniques (BAT) in 2021 is followed by the regulation of greenhouse gases (GHG) emissions. Moreover, the sector experiences pressure due to the necessity to boost recycling of plastics and, in the near future, to reduce their production. Accord...

The magnesium oxychloride cement (MOC) as an alternative to commonly used Portland cement (PC) has been intensively studied in the past decade. Compared to PC it is more environmentally sustainable and it can be considered as CO2-neutral due to the low calcination temperature of the raw materials and its ability to absorb CO2 from the atmosphere. The objective of this paper was to develop a composite material based on MOC, containing partially oxidized multi-walled carbon nanotubes (partially oxidized MWCNTs) in o...

The purpose of the analysis is to uncover and understand prospects and opportunities for maintaining economic stability while continuing the strategy of diversification of economic structures in the countries - members of The Cooperation Council for the Arab States of the Gulf (GCC), two of which: Saudi Arabia and the United Arab Emirates are the leading economies of the Arab world. The deterioration of the economic situation in the GCC countries could inevitably lead to destabilization in the complexly developing...

The Brown Coal Research Institute j. s. c. is realising the long term research and survey in the field of restoration problems and it is realising the long term research of climate changes in the Czech Republic including impacts to mining operations during research programme of the European Union TEXMIN solving too. The input of expected temperature increasing and precipitation decreasing is favourable for mining operation from point of view of overburden and mining cuts stability, safety of mining and mining cost...

Prevention of major chemical accidents, covered in the European Union by SEVESO III Directive (2012/18/EU) belongs among important environmental laws and it demands, together with general safety management and emergency preparedness, also security aspects, i.e., protection against intentionally caused major accidents as terrorist attacks and/or sabotage. This demand has an increasing importance in the time of hybrid attacks and growing terrorist activities, where chemical energy present in technologies and industr...

Current context in which the emphasis is on promoting the circular economy, due to environmental policies, the food industry is constrained to develop new strategies to reduce food waste. The beer industry generates significant amounts of by-products that are often incorporated into animal feed or aquaculture. Yeast, the second by-product of the brewing process is generated in large quantities of 1.5 kg to 3 kg/100 L of beer produced. By using various purification processes, the residual brewer's yeast can be easi...

At present, there is no uniform method that would use quantitative factors to evaluate the quality of public spaces. Most analyses are subject to the subjective opinion of the processor and cannot be applied to different territories. The work is devoted to the analysis of the quality of public spaces by creating a multicriteria evaluation taking into account transport, safety, environmental, economic and social impacts. Using multicriteria evaluation methods using purely quantitative data, it is possible to create...

Crimea is a water-stressed region with intermittent spatial and temporal distribution of water resources. Water demand covers by reservoirs, fields of pumping wells, and taping springs. Groundwater resources of the region are estimated as 1216 thousand m3/d or 0.54 L/sec/km2, in the Crimean Mountains ? 1-2 L/sec/km2, so they are concentrated in a relatively small area. Methods to increase water supply, like conjunctive use of surface and groundwater, managed artificial recharge, seawater desalination, are used in ...

The major part of the radiation dose, which humans receive from natural radioactivesources, originate due to radon and its decay products inhalation. Indoor radon poses asubstantial threat to human health when build-up occurs in confined spaces such ashomes, mines and caves. The health risk increases with the duration of radon exposureand it is also proportional to the radon concentration. Tourist caves are a case of specialenvironmental conditions that may be affected by high radon concentration. The aim ofthe wo...

The paper focuses on updating the results of partial steps associated with the socio-economic evaluation of public projects in the field of transport, specifically railway infrastructure. The article builds on the research results presented within previous scientific articles where the unit impacts of sub-categories of occurrences on the Czech railways were determined using a detailed Database of Occurrences for the 2011-2018 period. Within the research work of the project "Evaluation of Increased Safety and Relia...

Rainfall erosivity is an indicator of the potential of precipitation to generate erosion processes and is essential for understanding the climatic vulnerability of a region. This article aims to develop a model for evaluation the average annual and seasonal rainfall erosivity in areas with different climatic and orographic conditions. The studied area covers the regions of Lovech and Kardzhali, which are characterized with high intensity of erosion processes and high erosion risk. To achieve the goal of the study ...

The electronic historical-geographical atlas of cultural and historical landscapes of ancient waterways is a combination of a traditional atlas and a geographic information system (GIS). The atlas intends to include electronic, accessible via the Internet, integrated maps of historical waterways, interactive three-dimensional models of their most important sections, with identified natural and hydraulic monuments, historical and cultural objects, historic monuments and sites, including descriptions of the topograp...

For the territory of the Crimean Peninsula, no morphometric analysis of the entire terrain relief has been carried out using common methodology. This makes it impossible to compare the results obtained. When performing a morphometric analysis, researchers pay inadequate attention to the choice of an operational unit to be studied. This is the reason why the results obtained using the same materials differ significantly. Therefore, the purpose of the work was to conduct a morphometric analysis of the Crimean terrai...

The ecological movement emergence in the Federal Republic of Germany and its subsequent, rapid politicization, on which wave the Green Party is institutionalized, was due to a reasons complex set for socio-economic, political and spiritual origin, passed through the relationships existing system prism between human society and the environment. These reasons? combination initially gave the ecological movement a specific features number, which presence greatly complicates its socio-political essence knowledge, since...