Browse

Commonly the intensification of agricultural practices is regarded not only as one of the established techniques for achieving agricultural and food independence but also as the key instrument for alleviating world hunger. Despite its considerable potential, intensification has become a controversial topic that attracts particular interest due to its substantial negative impact on greenhouse gas emissions, biological diversity and natural habitats. This paper aims to explore and compare the degree of intensificati...

The use of Earth observation satellite data is an efficient monitoring method for the state of natural ecosystems disturbed by the development of georesources. A permanent multispectral satellite survey provides an opportunity to study the dynamics of ecological restoration by observing the changes in the spectral reflective properties of the landscape. At the same time, it is problematic to interpret the satellite observation data of the surface being in the shade during the survey, because in the absence of dire...

The number of registered cases of COVID-19 is increasing in the world, and some countries are reporting a second wave of the pandemic. Accurate and real time information about epidemiological situation is therefore urgently needed for managing decisions in the countries, regions and municipalities which are affected. Massive testing of viral presence in people’s saliva, a smear from the nose, nasopharynx and / or oropharynx, bronchial lavage water obtained by fibrobronchoscopy (bronchoalveolar lavage), as well as ...

In this study, based on a relatively high resolution wind database (ERA5), an assessment of the nearshore wind conditions in the western part of the Black Sea was conducted. From the reanalysis of the wind datasets provided by the ERA5 product, significant differences between the onshore and offshore wind power were identified, with the offshore regions being more resourceful than the onshore ones. Generally, the appeal of a site for a wind farm project is determined throughout a classification of the wind classes...

Ceramic materials based on titania and zirconia hold much promise in modern nuclear energy applications. Such materials due to their chemical and mineralogical similarity to nature-derived minerals may be used as matrices for radioactive waste immobilization as well as inert matrix fuels in the ‘burn and bury’ fuel cycle. However, sintering of such ceramics into a dense body is still a challenging issue. This paper addresses phase formation processes and sintering patterns of ceramics in TiO2 – Al2O3 – ZrO2 – MgO ...

Covid-19 has turned our world upside down and transformed nearly every aspect of daily life, business and travel. The COVID-19 pandemic has had severe negative impacts on human beings in all spheres of economic, social and even geopolitical life worldwide. The impact of this crisis will be the subject of numerous studies in all fields of scientific research in the coming years. According to all official data, the tourism sector is one of the most affected sectors of the economy. Despite the reported partial recove...

This paper presents an exploratory study that analysis the factors that influence the intention to use smart meters that measure electricity consumption. The authors used the technology acceptance model as a starting point for their research, taking into consideration other eight external variables: social influence, familiarity with smart meter technology, task-technology fit, compatibility, the level of trust in companies that supply electricity, price awareness, energy conservation intentions, and perception of...

The studied structure is situated in the Carpathian Foredeep and past geological and geophysical prospecting have proven the existence of a large anticline formation with reservoir proprieties in the SW area of the structure. The prospecting and development stages for this particular reservoir started decades ago, however, recently there have been an intensification of seismic prospecting in order to asses the possibility for an increased production. A large gravimetric study was done at a regional scale that esta...

One of the discussion issues of karstological studies is the identification of karst denudation intensity; it means the quantitative evaluation of the intensity of this process, which, in turn, allows to predict the karst development. The problem of karst denudation is developed insufficiently today, which can be explained by the complexity of the issue and at the same time, the methods used to assess the intensity of denudation are not yet refined. The intensity of denudation and its general regularities in the Z...

There are two main sources of activated carbon production - coal and lignocelullosic materials. Recently, scientists have been focused on activated carbon preparation based on agricultural waste and lignocelluloses materials, which are effective and very inexpensive such as corncob, hazelnut shell, olive stone, Jojoba seed residue, etc. The cake remaining after the oil extraction from Pistacia fruits constitutes about 50% of the initial composition, so any commercial utilization of Pistacia oil should consider the...

The present paper is focused on depollution techniques representative for mining and non-ferrous metallurgy, which will assure a radically changed technological concept for a clean, safe and eco-efficient production, leading to sustainable development industry. At the same time, our works propose the implementation in the mining and metallurgical sector of unconventional processes through innovative techniques that lead to processes intensification, reduction of energy consumption, decrease of carbon footprint, by...

The article analyzes the issue of agricultural development of German-speaking colonists who lived in the steppe zone of Ukraine. The article analyzes the general features and main directions of development of this process and the reasons that caused it. The main attention is paid to the process of transformation of colonial agriculture. Until the 1860s, the most important and profitable branch of agriculture of the colonists was cattle breeding. However, due to rising grain prices, the importance of agriculture in...

This work presents an empirical model for forecasting the hourly values of the ionospheric E-region critical frequency (foE) over Bulgaria in dependence of both: the index of the solar activity described by F10.7 and the cosine of solar zenith angle. The dependence of foE on solar activity and solar zenith angle is studied by correlation and regression analysis. The obtained relationships are used as a base for the synthesis of the model. The model is produced by using the hourly values of foE obtained in the iono...

The present study's primary purpose is to evaluate and provide a more comprehensive, unbiased and helpful picture of the Romanian energy potential, highlighting the emerging renewable resources. Firstly, several indices are taken into consideration to underline the Romanian energy portfolio structure. The installed capacities and the country's power generation, carbon dioxide emissions, nuclear generation and consumption, and renewables power are among the critical indices used in this project. The data and result...

For craton's areas the most valuated geological object ordinary are situated in river valleys. There are stratotypes, interesting outcrops, unical paleontiological localities. However over time a lot of valuable geological objects lost. The natural and anthropogenic factors are analysed in the article that determine the preservation of specially protected natural areas and, in particular, valuable geological objects on the example of some river valleys of the north-west of the Russian Plate. The article reflects t...

In 2020, China and India accounted for two-thirds of global coal consumption, while the European Union and the United States accounted for only 10%. Coal consumption in Southeast Asia has now surpassed the European Union and will soon surpass the United States. Now the global coal trend is mainly influenced by Asia. Changes in the demand for coal in China are closely related to economic growth, but in different periods of the development of China's industrialization, the degree of dependence of economic growth on ...

Textile production is considered one of the most polluting industries with a high impact on the environment, both in terms of increased resource consumption and textile waste generation. Moreover, in the past years, the textile industry registered a significant growth, which leads to large amounts of textile waste that need to be controlled and managed. This problem highlighted the need for sustainable methods and improved technologies for textile recycling, and brings into focus the importance of circular economy...

This work is devoted to the feasibility of implementing capture and sequestration projects (CCS) in Russia, as well as to evaluation of the positive and negative aspects of implementation of CCS projects as a climate change mitigation technology. The study focuses on the current state of the problem of CO2 capture and disposal and considers possible implementation of CO2 sequestration projects in Russia. The negative and positive factors of CCS technology are also identified. The conclusion provides arguments for ...

One of the components of sustainable consumption is the consumption of organic products. Organic foods, which are natural and healthy, are increasingly competing with conventional quality products. It is therefore important to substantiate the opinion formed about the higher quality value of organic food. 2020 At the LAMMC Institute of Horticulture, red beets were grown using two different farming systems: organic and conventional. Beets grown in different agricultural systems, of the same varieties, allow to more...

Now in the global oil industry more than 50 million tons of raw materials are lost annually during the extraction, transportation and processing of petroleum products, which leads to widespread environmental pollution of the environment with oil waste. In view of the importance of the identified issues, various methods aimed at regular monitoring of fuel and energy complex facilities are of particular importance, with the aim of early warning and detection of oil product leaks, localization of their occurrence and...

On a global scale, every year the environmental problems that arise when using traditional methods of obtaining heat and cold are becoming more and more relevant. In this regard, and also in view of a number of successes in the field of materials science, in recent years, the thermoelectric Peltier effect has been of increasing practical interest to researchers. So for several years, the average increase in the global production of thermoelectric modules and thermoelectric devices for various purposes was about 15...

Nowadays, the food supplement industry has grown considerably, mainly due to the orientation of consumers towards more natural products. In Romania, the Institute of Food Bioresources notified over 900 food supplements in 2020 and over 1500 in 2019. Unfortunately, the use of these supplements, although healthy, is problematic due to environmental pollution. The packaging used, often disposable, is highly polluting, multilayer, difficult to sort and impossible to recycle. This paper presents a viable option for pac...

The article is devoted to the study of the features of the formation of dust storms as a complex agrometeorological phenomenon that develops with a combination of a number of natural factors, which include heliogeophysical, synoptic-meteorological, physical-geographical, as well as anthropogenic factors. The latter are caused by mistakes in the development of agricultural land and general problems in the development of the agro-industrial sector of the territory's economy. As shown by the analysis of hydrometeorol...

On the path of economic development, sustainable waste management is a difficult step. Especially in low-income countries where management systems are imperfect managed, with low infrastructure and public awareness, lead the country to critical out comes. Landfills in Georgia, with few exceptions, do not meet international standards. In addition, spontaneous, illegal landfills are being created in the villages. Residents dump their waste into the water, on the river banks, near agricultural lands, in a ravine. Unc...

A bioeconomy refers to economic activities using renewable biological resources to produce energy and consumer goods. The role of the bioeconomy in the world tends to increase, as countries need to find environmentally friendly solutions under changing climate conditions. For this reason, bioeconomy strategies are developed in many countries to purposefully contribute to their development. Among the Baltic States, Latvia was the first one to design and adopt its national bioeconomy strategy (Latvian Bioeconomy Str...

The article is devoted to the assessment of the impact of the state of drinking water supply systems on the health of the population of the Siberian Federal District and the life expectancy of the population. Water is a vital strategic resource, and the issue of providing the population with a sufficient amount of sanitary water is one of the urgent problems of mankind. Taking into account the importance of efficient water use, the relationship between water resources and the environment, the UN General Assembly p...

The hydrocarbon reservoirs in mature regions are extremely complex, each reservoir having its own identity. The value of recoverable geological reserves depends on the data of geological and geophysical studies: determination of heterogeneity and reservoir compartmentalization. Residual oil reserves are concentrated in undeveloped clayey, poorly permeable intervals along the section, the development of which is impossible without research and development. One of such studies is the methods of lineament analysis of...

The present study focuses on the assessment of station corrections for eleven seismic stations from the national network of National Operative Telemetric System for Seismological Information (NOTSSI). Station corrections are obtained by calculating the ratio of the spectrum of the horizontal components of the signal to the spectrum of the vertical component (H / V). Records of S-waves from 20 local and regional earthquakes are analyzed. The values of A0 - site-effect and f0 - resonant frequency were obtained. Acco...

The study of seismicity in the Black Sea region is of particular interest for assessing the vulnerability of the surrounding coastal zones to strong earthquakes and their consequences. The seismicity pattern in the area is determined by the geodynamic processes along the boundaries of the Eurasian, Anatolian and Arabian tectonic plates. The paper presents an approach to assessing the seismic activity of the Black Sea and the surrounding region covering historical and recent seismicity. The historical events since ...

Changes in market demand inevitably lead to changes in the assortment policy of oil companies. It is necessary to change the production capacity at the enterprise and the sales policy, demand profitable types of products that will be in demand among consumers. The competitive strategy of oil refining companies is currently largely determined by the drop in total global demand for dark oil products and the high rates of development of petrochemicals. The focus of the paper is on analysis and development of assortme...

The main cause of Albanian seismicity is the collision of Adria microplate with the Albanian orogeny. Albanian territory is characterized with high level of seismic hazard in the Europe. It is very important to emphasized seismic zone of Durres that generated a strong earthquake M6.4 on 26 November 2019. During the 2020 year, seismic activity at the Albania territory and its surroundings was characterized by a normal seismic activity. Earthquakes foci are concentrated mostly along the five active fault zones: Fier...

Environmental Industrial Policy (EIP) as an integral part of the industrial policy aimed at the resource efficiency enhancement at two levels – the level of industrial installation and the regional level. The article shows the correlation between Sustainable Development Goals, Environmental Industrial Policy and Circular Economy goals. Authors focus their analysis on the construction materials industry as one of the resource intensive sectors regulated both by the legislation based on Best Available Techniques (BA...

Global trend to renewable and green energy application instead of fossil fuel results in grows of bioethanol production and its application in transport and industry. Typically, bioethanol can be used as motor fuel purely and in blends with hydrocarbons, however bioethanol fuel containing less energy compared to traditional gasoline. A possible solution to this disadvantage can be catalytic transformation of bioethanol into hydrocarbons. Bioethanol can be transformed into hydrocarbons over different zeolites inclu...

Our planet experienced many intervals of climate deterioration due to terrestrial causes, such as intensified volcanism and a very active tectonic regime or extraterrestrial causes. The later includes major meteorite impacts and change in the exosphere, mostly linked to the modification of sunlight amount leading to glaciations. The most sensitive organisms to climate changes are the marine planktonic ones, especially the coccoliths and dinoflagellates. This paper describes modification in the marine planktonic wo...

Integrated assessment of ecological status and ecological well-being of water bodies based on monitoring presupposes attributions of the aquatic ecosystems to definite gradations of trophic state and level of pollution. In really these attributions are carried out by means of multi-criteria evaluation. The evaluation uses a number of parameters. Each of them must be indispensable, and the parameters taken together must be sufficient for the precise evaluation. Of course, each of the parameters must be suitable for...

In the literature, the quantities describing the physicochemical parameters describing the combustion processes are: calorific value, cetane number LC, auto-ignition temperature, solidification point, viscosity and surface tension, and heat of vaporization. This article shows that another parameter influencing the combustion process in a thermodynamic engine, which is an engine, is also influenced by chemical bonds between atoms. Selected 11 alcohols differing in the number of chemical bonds between carbon atoms (...

The Ogosta river catchments is one of the main water systems in North Bulgaria. The present study focuses on the characterization and analysis of the chemical peculiarities of the water in the upper part of the catchment area of the Ogosta river. It is based on a series of chemical analyzes of water samples collected during field research in the river monitoring area. The results obtained from the four basic different control points taken during the study. The investigation includes field and laboratory research o...

In the context of global climate change and the increasing anthropogenic impact due to the process of intensiveness of nature management in the Arctic coastal eco-socio-economic systems, there is an increase in the production of risks of natural and anthropogenic origin. The purpose of the paper is to substantiate and develop a classification system of risks of Arctic coastal nature management, sources and factors of their production as well as possible relationships between structural elements, which makes it pos...

Violation in technologies of using and storing the organic animal husbandry waste is leading to deterioration in soil sanitary state and agrocoenosis. As a result of increased biological pollution, soil self-cleaning ability is decreasing, which leads to negative changes in its biological diversity and biological activity, arrival of toxic compounds in high concentration, deterioration in vegetable cultivation products quality, state of environment and human health. In this regard, evaluation of the soil sanitary ...

Eleven stations of the Bulgarian seismological network - National Operating Telemetry System for Seismological Information have been used for an assessment of the stations' corrections (site effect), to account for the impact on the seismic waves of the low-density layer immediately below the seismic stations, amplifying the signal. Nakamura's method for calculating the ratio of the spectrum of the horizontal component to the spectrum of the vertical component (H-to-V) is applied. Data from 20 local and regional e...

The use of electrical equipment in potentially explosive atmospheres requires special attention, namely from the point of view of their construction and maintenance. Together with the technological developments, these objectives can easily be met, objectives which are defined by European standards concerning the construction, use and maintenance of explosive proof equipment. Evaluation of explosion-proof protected electrical equipment in scope of certification is extremely important considering the risk of explosi...

The presented article deals with a comparison of the structural and technical condition of sewerage systems operated by water companies and owners of water management infrastructures in the Czech Republic. The owners and operators of the sewerage systems in the Czech Republic include some municipalities with less than 2,000 PE who operate the sewerage themselves (the so-called "self-operators"). The Water Supply and Sewerage Act No. 274/2001 Sb. specifies an obligation for the operators to generate reserve funds f...

The climate change, recently commonly referred to global or anthropogenic warming, is extremely important areas of research in recent years. Measurements show that the Earth's mean temperature and mean sea level are rising, mainly due to increasing anthropogenic greenhouse gas emissions, such as carbon dioxide, methane, nitrous oxide, and fluorinated gases. Other important factors of climate change are stratospheric sulfur aerosols, whose ability to reflect solar radiation back to the space may cause cooling effec...

Although intensification of agricultural practices is traditionally viewed as one of the quickest way of achieving food independence, the increasing demand for energy and unsustainable development of agriculture are detrimental to natural habitats and decrease biological diversity. Organic farming offers a viable alternative and has the potential to facilitate the gradual expansion of environmentally friendly technologies. By carrying out the analysis of statistical data on the value of organic production obtained...

The determination and modelling of the territory is common scientific instrument for presentation of the state of the nature and human systems. The present research is based on the morphological and hydrological peculiarities in the river catchment. It observed of the Danube coastal zone in Bulgaria sector of the river. The differentiation and determination of the coastal area is key element in the process of the management of the territory and development of the regions. The general results of the research are re...

The article is devoted to the discussion of the possibilities of determining turbulent zones for predicting the dispersion of anthropogenic impurities in the lower air layer of the atmosphere. As you know, the atmosphere, being a dissipative system dissipating energy, is almost constantly in a state of instability. This unstable state of the atmosphere is based on deterministic chaos, which is a very important feature of the atmosphere as a dynamic, changeable environment. During the transition from the state of s...

Doubtless, the application of UAV is a new iteration of remote sensing technologies applied for obtaining information about the object of investigation. An opportunity of fast data acquisition for a large area of research provides to reduce the costs and expand the scope of application. One cannot deny that this approach is actual for geophysical methods of investigation, for aeromagnetic exploration particularly [[1]]. One should note here that process of adaptation of magnetometer sensors for UAV gets a new requ...

The only one natural gas storage in Bulgaria - Underground Gas Storage Chiren requires modernization and development. A set of activities have been planned and implemented, covering research, technological and production activities. An overriding task and a top priority are to increase capacities - in volume and productivity of the storage. The aim of the research is to determine the necessary modern set of knowledge that will draw the attention of stakeholders to the possibility of modernization and increase the ...

Today the concept of e-commerce has become commonly used, and e-commerce has become an integral part of commercial transactions. An increase in the number of global Internet users is the driver of increase in the number of e-commerce transactions. The introduction and role of e-commerce is not well-understood by any manager of a small and medium enterprise. It takes time and money to introduce e-commerce in business, especially in retailing. Enterprise managers need a clear e-commerce introduction strategy to see ...

Proposed within the framework of the conducted study were options for producing the titanium trichloride, a precursor for the synthesis of titanium dioxide nanoparticles to produce dye-sensitized solar cells (DSSC). Optimal concentrations of the initial titanium tetrachloride solution were identified, which have a major effect on the reduction process and the stability of resulting titanium trichloride solutions. Possible synthesis and destruction mechanisms of the titanium trichloride under the influence of vario...