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In the present article, based on the analysis and identification of the problems related to the socio-economic development of the border municipalities between the Republic of Bulgaria and the Republic of Serbia, an attempt is made to identify the main problems in forming policies to improve cross-border cooperation and achieving a balanced socio-economic development that will slow down the rate of population decline in the municipalities in question. The role of the local self-government bodies and the opportunit...

Legislative changes within the circular economy package, initiated by the European Union and in the process of incorporation into the legislation of the Czech Republic, lead to a ban on landfill after 2024. More precisely, these changes lead to a significant reduction of landfill, with tons of landfilled waste. The aim of the changes is to reduce the landfilling of municipal waste to a maximum of 10% in 2035, to prohibit landfilling of recoverable waste (mixed municipal waste) and to increase the recycling of muni...

The purpose of the article is to analyze the prospects of ?Green Growth? in cooperation with the oil sector of the economy of the countries, stated above. The creation of mechanisms for meeting the challenges of structural adjustment of the industrial economy under environmental threats of a planetary and regional nature could not but affect the countries - the largest producers and exporters of oil, such as key participants in the world oil market, Saudi Arabia (together with other Arabian monarchies - members of...

During the oil field development process some of productive formation areas remain undrained which brings to decrease of total recovery factor. Conventional methods of reservoir development control including well testing, tracer studies as well as reservoir simulation have significant limitations when analyzing the inter-well space. To localize oil saturated undrained areas in the inter-well space, it is necessary to develop new approaches, and one of them may be the geochemical survey based on analysis of gas com...

This paper is focused on the simulation using Matlab/Simulink software? of the Photovoltaic (PV) module for a better understanding of the power generated under different atmospheric conditions. One diode model and double diode model of a PV cell are also shown in this paper. The simulations could be performed considering both models, but here only the PV characteristics for one diode model will be shown. Thus, the PV characteristics will be shown for series connection, for parallel connection, for series connectio...

The concept of greywater reuse has been gaining importance recently. These systems are also becoming a must in Europe, where there has not been such a pressure exercised on greywater (shower and bath water) reuse to date. The situation is dynamically changing, some countries in southern Europe start facing a lack of drinking water and new water resources must be searched for. Recycling some of the water is also encouraged by the fact that these systems are cheaper that sea water treatment. The main reason for grey...

The resource base of Ukraine has 60 deposits of iron ore with proven reserves. The quality assessment of these objects was carried out during their exploration several decades ago. Commodity products of domestic mining enterprises are various types of iron ore, concentrate, pellets, agglomerate. Mostly commodity concentrates have a total iron content of 64-65%. The best indicators (more than 67% of Fe total) are characteristic of certain types of concentrates of Central and Ingulets enterprises. The quality of com...

This paper analyses the vibrations and noises transmitted to the seafaring staff on a cargo river ship on the Danube between Novi Sad and Sulina. The ship has 5 people as sailing personnel: 1 captain, 1 coxswain, 1 mechanic, 2 sailors. The trip was made in the fall of 2018. Parallel measurements were made on the main bridge as well as inside the engines room, in three situations: ship leaving the shore, running and mooring maneuver. We measured and calculated the main vibration parameters: Vibration magnitude r.m....

The largest iron ore basin in Europe, located in the city of Kryvyi Rih and in which since 1876 and to this day continues the active development of the mining industry causes the rapid emergence of anthropogenic landscapes. And thus the question arises as to what scale technogenesis has covered, what the largest landscape systems have emerged as a result of the mining industry, and what optimization methods are being carried out to maintain the area to prevent man-made hazards. In our work we have analyzed the qua...

One of the promising areas of rare-metal mineralisation containing rare-earth elements is the Karakamys ore district located in the west Balkhash region, within the limits of the Chu-Ili ore belt. The area is under-researched in regard to rare-earth mineralisation. Within the ore district, there are three dozen known rare-metal objects with associated rare-earth mineralisation (Karakamys, Shakshagaily and others). The majority of objects are concentrated in east near-contact zone of the Kaib granitoid massif, in m...

Study presents the current state and assessment of prospective ways of college campuses development in the Russian Federation based on environmental reconstruction. There is identified the main complex of problematic aspects of sustainable architectural development of campus territories. The paper proposes a concept of integrated modernization of buildings and territories of Russian universities. The presented priority directions for the college campuses reconstruction is based on the green building system. The re...

The region of Kardzhali is earthquake prone to various local and near/trans border seismic impacts. That is why their combined analysis is of interest to be studied. The 3 most significant seismic events that struck this region in the last 15 years are considered and discussed. That is: the 2006, M=4.5 local one; the 2014, M=6.9 transborder and the 2019, M=3.6 local one. The real dynamic impact by these events transformed into the earthquake engineering characteristics they produced is evaluated. Data accumulated ...

In the past few decades it has been evident that various human activities can induce local seismic activity. One of the important factors of human induced seismicity is hydrocarbon fields? development [6], [12]. One of the regions with probable induced seismicity is Tatarstan Republic where a giant Romashkino oilfield has been produced for a several decades. The link between seismicity and hydrocarbon production for this area was previously studied [1]. In this study the attempt has been made to find possible refl...

Renewable resources? share in meeting the power balance in Romania grew constantly during the past decade. Therefore, the contribution of polluting energy sources (such as coal or oil) has progressively reduced. Moreover, to enable environmental impact mitigation for the still operating classical plants, proper desulphurization equipment were installed. It is remarked that the shares corresponding to hydro-energy and nuclear energy show an almost constant trend. Sensible investments were made in the energy sector,...

To date, the main oil and gas deposits in the Cambrian and Precambrian section of the south of the Siberian platform are confined to the terrigenous part of the Precambrian sedimentary cover, while in a much more powerful halogen-carbonate (HC) complex of the Vendian-Cambrian and the Lower Cambrian, the little commercial hydrocarbon accumulations were found. Therefore, the prospect of the largest reserve for increasing oil and gas deposits is associated with the carbonate complex. Along with the urgency of identif...

This paper presents the results of a study of the hydrolysis of microcrystalline cellulose in a subcritical water medium. The influence of temperature, time, cellulose/water ratio, cellulose particle size, and other parameters on the hydrolysis process was studied. The influence on the process of pretreatment of aqueous dispersions of cellulose with ultrasound was studied. It was shown that the optimal processing time is 30 min (~ 150 kJ). Over a given period of time, destruction and partial hydrolysis of the amor...

The aim of the paper is to propose guidelines for a general virtual reality based framework for training people how to behave and evacuate in business buildings during disastrous events. Disaster is a chain of dangerous events or exposure to hazardous conditions, which could lead to harmful damages to people with an eventual loss of life or property. Such risk conditions can be managed by planning well ahead before disasters occur and by performing suitable training to avoid critical disaster consequences. The pap...

Spontaneous combustion is a phenomenon that results from the heating of combustible organic powders by slow oxidation and which occurs through the air passage (created by an air depression) through the mass of dust. The oxidation phenomenon of combustible powders represents their reaction with atmospheric oxygen resulting in products of carbon dioxide, carbon oxide, water and other gases whose content depends on the temperature at which the oxidation takes place. During oxidation, the oxidation rate is a function ...

The work is devoted to historical retrospective on the main aspects of the modern concept of development of the world economic system. The relevance of research is due to the presence of environmental problems in the modern economy. The data on the impact of the concept of world development on environmental development are presented. The genesis of the development of the main scientific publications on the chosen research topic is presented. The role of such a non-governmental organization as the Club of Rome, whi...

Hospitals are an essential element of public infrastructure. Some aspects of civil infrastructure have become considered critical. Critical infrastructure means an element of critical infrastructure or a system of critical infrastructure (healthcare system), the disruption of the function of which would have a severe impact on state security, provision of basic living needs of the population, and the health of persons or state economy. To the critical infrastructure sector belongs transport, energy, agriculture, h...

The paper deals with the quantitative risk assessment approach to the use of the universal quantitative method RM/RA CRAMM. The method is applied to criminality cases related to arson and other cases of environmental insensitivity influenced by social background. The arson statistics recorded in Slovakia are usually hidden behind other reasons of the fire cause. The hypothesis is that there is a certain impact of the social environment on criminality, including arson behaviour. The quantitative method needs quanti...

Flammable liquids in motion when is transporting by pipes, is mixing, pumping, filtering, agitating or by pouring them from one vessel to another can generate static charges even if the respective pipes or vessels are bonded and earthed. Also, loads may occur if the liquid is splashes and forms a mist inside the vessel (tank, container). Accumulation of static electricity can, under certain conditions, be discharge and ignite the explosive atmosphere. In the paper are presented some aspects regarding the technical...

In order for Latvia to achieve the long-term strategic goal set in its policy documents ? to become the greenest country in the world ? it is essential to promote social entrepreneurship, as the social enterprises perform economic activities having positive social effects in relation to the protection and preservation of the environment. In 2019 in Latvia, 5% of the social enterprises were engaged in the field of environmental protection; therefore, the research aims to examine the role of social entrepreneurship ...

A large group of commercial minerals known as ?industrial minerals? is used worldwide. Industrial minerals are understood as useful mineral deposits, i.e. all minerals extracted from the earth, except for energy raw materials, metals, water and gemstones, and used for industrial purposes owing to their physical, chemical and mechanical properties. The geological structure of the continental eastern Fennoscandian Shield (Karelian Region), the basement of the East European Platform, is controlled by its long geologi...

The paper presents well-preserved microfaunas (foraminifers and ostracods) enclosed in cuttings samples and cores recovered by 6 hydrocarbon wells drilled in the Moesian Platform, in Silistea area, S Romania. The lithological and micropaleontological obtained data improve the stratigraphic knowledge at regional level. The analyzed samples contain foraminifera that characterize biozones extending in the Sarmatian, as follows: the middle Volhynian Varidentella reussi, the late Volhynian Elphidium reginum, the early ...

The work dwells on finding solutions to a task related to substantiating locations where instrumental measurements should be performed within a program for monitoring over exposure to electromagnetic radiation (EMR) in radio-frequency range in a large industrial city with its area exceeding 800 km2 and population being more than 1 million. A database has been created (and bound to a vector map of the city) containing data on 2 011 sources of EMR in radio-frequency range. They were 1 666 basic mobile communication ...

The investigation of the ambient seismic noise recorded by the Bulgarian Antarctic seismic station LIVV over four polar summers from 2015 to 2020 is presented in the paper. The method for evaluating the Power Spectral Density and Probability Density Functions is applied to study the distribution of the seismic noise in a period interval from 0.02 s to 30 s. The method is widely applied in seismological practice of the Seismological Society for carrying out both fundamental and practical scientific projects. For a ...

The coastal retreat in touristic areas concerns many sectors along the Romanian Black Sea shore; it usually requires programmes for beach nourishment, and consequently, large amounts of proper sand are necessary to be available for such activities. In order to minimize the effort for searching offshore sand, we conducted seismo-acoustics researches and some other archived data have been used during these researches, both for planning the sea works and during the integrated interpretation of the data. The results o...

A high-quality environment is becoming absolutely necessary not only for the health of the population, but also for the good functioning of the economy and the availability of natural resources. The aim of environmental policy and instruments of environmental policy is to ensure the required quality of the environment. Environmental aspects have become an essential part of the decision-making processes of developed European countries. Environmental management has not been implemented separately from other economic...

Development of passive margin, due to thermal cooling of the stretch lithosphere, creates a large accommodation space subsequently filled with sediments brought from the emerging continent once the river system is established [1]. This combination of rapid subsidence and sedimentation generates an instable architecture with large shelf progradation on top of early post-rift sediments [5]. Given the typical fine grain lithology of these deposits, in most of the cases they become overpressure and an ideally zone for...

Global event such as war, pandemic, political embargos affect overall economy of airline carrier by influencing the most important variables such as load factor or fuel prices. Aim of all companies is to be profitable, what means to cover all constant costs and fuel costs with profit from tickets which are closely linked with load factor. In this study we chose to study economic impact of COVID-19 pandemic and its effect on load factor and fuel prices and overall economy. To describe the problem, we chose yearly e...

The current study encompasses a total of thirteen municipalities along the border of the Republic of Serbia. They are as follows: Bregovo, Boynitsa, Kula, Makresh, Belogradchik, Chuprene, Chiprovtsi, Georgi Damianovo, Godech, Dragoman, Trun, Treklyano and Kyustendil. The borderline territories with the Republic of Serbia are in the North Western and Mid Western parts of Bulgaria. The actuality of the issues concerning the listed municipalities relates to the fact that the greater part of them belong to the most un...

The aim of the work is to point up on the relation among Arson criminality and social network groups. The impact of the internet social networks on arson crime is discussed in the paper. The impact of the top social networks incl. facebook or twitter is generally very high on the society. The arson criminality is partly hidden in the fire statistics especially in Slovak republic were the fire cases investigated with unknown fire source usually point up on the unknown perpetrator. Fire related crimes are often disc...

The study was aimed at monitoring social responsibility and environmental risks of the largest Russian metallurgical companies based on public reports and other sources of information. The methodological basis of the study was the regulatory documents on environmental safety, sustainable development standards in the field of ecology; information and rating agencies data; Internet resources of metallurgical companies, their financial and environmental reports, analytical reviews; works of foreign and Russian scient...

Since Latvia joined the European Union (hereinafter the EU) in 2004, socio-economic territorial development in the regions of the country has been unbalanced, increasing regional disparities. At NUTS3 level, there are six statistical regions in Latvia. Zemgale is one of the regions of Latvia. Since 1992, two administrative and territorial reforms (hereinafter ATR) have been implemented in Latvia, and in 2021 it is planned to carry out the third administrative and territorial reform. In June 2020, the new ATR was a...

The period of Greek colonisation and economic land development in the northern Black Sea coast stimulated an active transfer of agricultural technologies of subtropical farming from Asia Minor to the sub-Mediterranean region of the South-West of Crimea starting in late 5 c. BC. This determined the formation of the original land management system, the practice of soul cultivation for perennial plantations, and adaptive crop production within the area of about 10 thousand ha, which largely characterises Tauric Chers...

Drought is a phenomenon with a possible negative effect on agroecosystems. It can cause significant impact and damages on crop, when the water balance is seriously affected. But additional harmful effects can be observed also on the whole agroecosystem. This is connected to the land surface and vadose zone, to the physical and chemical properties of soil and water; to the adjacent organisms, etc. To prevent and mitigate the possible dangerous effects of importance is best to know all the specifics of the drought p...

The aim of the paper is to propose some financial scenarios for recovery of natural disaster damages based on insurances and credits. In recent years, there has been an increase in the frequency and severity of natural disasters worldwide. It is well known that natural disasters can affect companies by damaging or completely destroying their material assets. This leads to a partial or complete economic activity interruption of the affected companies. The study focuses on the direct material damage to the companies...

In the present study, in laboratory conditions, a series of experiments were conducted to study the immobilizing ability of peats of Electrochemical Plant (Zelenogorsk, Krasnoyarsk Krai, Russia). It has been found that the studied sorbents have a significant sorption capacity and a reliable conservation ability towards uranium ions that prevent its spread outside the sludge storage. For quantitative characterization and calculation of sorption coefficients, laboratory experiments were conducted for three samples o...

Urbanization today is accompanied by an increasing interest in outdoor recreation and nature-oriented tourism. The topic becomes interesting in light of the most popular world practices to develop nature-oriented tourism and recreation in special protected natural areas. Specific spatial consequences for the sustainable development as for urbanized areas both for reserves are discovered. The territory of a reserve becomes a place of environmental stress (consider the goals of nature reservation), as well as social...

More sensitive methods to determine chemicals in food enable us to assess the contaminant danger in the product. It is of help when evaluating the speed and conditions of their formation in the food and studying long-term carcinogenic and acute toxic effects on the body. The results of exposure to contaminants on the body as biomarkers of the effect in a controlled experiment on laboratory animals and the further use of the results obtained in the risk assessment might serve as conditions for establishing or revie...

The Guli and Bor-Uryakh massifs, a part of the Siberian Large igneous province (LIP) are mafic-ultramafic intrusive complexes, with strong alkaline affinity. They contain deposits of apatite and are also known to be source rocks of Os-Ir-Ru placers. These massifs are of great interest for petrologists worldwide, as they are composed of an unusual variety of rocks (dunites/olivinites, shonkinites, melilitites, alkali syenites and carbonatites) and being coeval with Siberian trap volcanic rocks, including diamondife...

Bulgaria's European presidency has put forward a proposed step-by-step plan compared to relations in the Balkans. Improving relations is related to important aspects - infrastructural, economic, social and cultural. This is a great effort from all Balkan pages. Rethinking the past and outlining the future can be achieved through a common strategic goal or goals. The settled forces of the border towns and the business relations between them will reach tendencies for depopulation of some regions in Bulgaria. Such a ...

The purpose of this article is to present the algorithmization of the scenario planning process, based on cognitive methods of economic and mathematical modeling. The methods are based on the etiological diagnostics of synthesizing economic and non-economic indicators, exponential smoothing of the explanatory factors, and the results of the regression analysis. They will allow constructing multivariate scenarios (realistic, pessimistic, and optimistic) of the agrarian sector of Ukraine's economy. The assessment of...

The natural zeolites (NZs) are low-cost natural materials, available in large quantities in different parts of the world, with good mechanical and thermal properties, ion exchange capacity, ability to adjust pH, high surface area and adsorption capacity. Despite their wide range of applications, the use of NZs is limited in industrial processes (where synthetic zeolites are preferred) due to presence of impurities in their structure and the properties which could not be optimized by nature. These limitations can b...

This study is investigating the influences and effects of the chaotic exploitation of mineral aggregates and its direct impact on the evolutionary forms of the Siret River. The study is important due to the decommissioning of agricultural land caused by river erosion in the area of Gala?i County. After the comparative analysis of the new topographic plan with the old soil map, we identified how the area, exploited by private companies in order to extract mineral aggregates, i.e. sand and gravel mostly used in the ...

This paper proves news about the argillized (bentonitized) deposits that are part of a complex distribution of volcanic rock types occurring in the Gurasada region. These are the oldest deposits of volcanic origin crops out in the Gurasada open pit. Above these are volcanic deposits of andesitic composition represented by pyroclastic breccias, rare tuff levels and lava flows. The site observations, petrographic, XRD, RAMAN spectroscopy and chemical analyses indicated the formation of the bentonite deposit by weath...

Geophysical surveys of wells represent a wide range of methods, the rational integration of which make it easier the solution of geological problems. In this article, the authors investigate the issue of identifying the parameters of hydraulic fractures. This method is one of the frequently used methods for increasing well productivity. Modifications of nuclear logging and the possibility of acoustic logging are considered on the example of data before and after hydraulic fracturing in carbonate and sandstone depo...

Urban noise is affecting an increasing number of people and this is why it is becoming a major environmental issue, being a known fact that it affects all human activities and constitutes a stress factor with negative effects on health. It can affect the population both physiologically and psychologically, having an influence on the elementary activities such as sleep, rest, study and communication. Noise in the environment - a harmful and unwanted sound from the outside - is spreading, both in duration and in geo...

The area of intensively polluted territories in the world has been constantly increasing. The ecological situation within such territories is rather difficult. As to Russia one of these territories is the Urals. It is the populated region with a lot of wastes after very long period of mining activity (extraction of gold, platinum metals, salts, coal, diamonds, precious stones, copper, iron, oil, etc.). The special litho-monitoring program is worked out by the Perm University scientists with the purpose to control ...