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Conveyance of goods and travelling of persons through the tunnels of mines or subway is done on railways of narrow or normal gauge. In interventions in case of accidents, hydraulically operated installations with small dimensions are used for lifting and rerailing the derailed rolling stock. They include hydraulic jacks (double or single acting hydraulic cylinders), supplied with low flow rates at high pressures. Feeding of hydraulic cylinders for lifting and relocating the derailed rolling stock is usually done b...

Cyclophosphamide (CP) is a cytostatic drug prescribed at large scale, which proved to induce toxic effect on ecosystems and cannot be removed by conventional wastewater treatment processes. Therefore, there is a need to test advanced degradation processes for its removal from wastewater discharges. CP photocatalytic degradation via UV-VIS irradiation was studied using a Nitrogen -doped TiO2 catalyst. The catalyst was synthesized as thin film deposited on glass substrate under nitrogen atmosphere technique. The inf...

The purpose of the publication is to clarify the flood causes and consequences that occurred on 06.02.2012 on the Maritsa River near the town of Svilengrad. For this purpose, a survey of literature sources and technical documentation was carried out to clarify the main natural-geographical and anthropogenic factors for the formation of high waters of the Maritsa River and the manifestation of the flood in town Svilengrad. Based on this, as well as on field work, information for the creation of GIS databases for th...

The use, production, processing and storage of petroleum products and gases generate hazardous atmospheres that can be ignited and generate explosions, causing serious damage both to materials and the environment, and especially to human health and integrity. The use of equipment in this environment requires compliance with certain well-defined parameters, which must be chosen in correlation with the potentially explosive atmosphere in which it is to be installed and the type of protection, temperature class and c...

The DNA barcoding project provides a very quick and easy way to identify different types of organisms based on their DNA. The main objective of this study is to obtain the sequences of different species of fungi, plants and animals to map the biodiversity of Slovakia. This project also represents a new use for collections stored in natural history museums around the world. This paper shows in particular a laboratory view of the DNA barcoding project, such as the practical application of the methodology for differe...

Future climate scenarios of the Global Circulation model (GCM) show an increased frequency of heavy rainfall events, which may lead to more severe floods. It is also expected that more and more areas will suffer due to flooding as a result of growing urbanization. Public attention has increased in many parts of the world in recent years and calls have been made to improve flood warnings, including the United States, the European Union and Australia (Hapuarachchi, H.A.P, and Q.J. Wang 2008). To respond and manage f...

The study presents a detailed analyse of the morpho-dynamic processes of the main two bifurcations of the Danube River within its delta, at Ceatal Izmail and Ceatal St. George. The first bifurcation of the Danube, called Ceatal Izmail; here the river divides into two distributaries: a northern one, the Chilia (Kilia), and a southern one, the Tulcea. Forking to the right at Ceatal Izmail (Mile 43), the Tulcea distributary stretches further to 17 km to the second main hydrographic knot Ceatal Sfantu Gheorghe (St. Ge...

Laser scanning can be used to acquire measurement data for Building Information Modeling (BIM). Terrestrial Laser Scanning (TLS) technology is ideal for this type of work. Having a point cloud of the measured object, dimension and model it in accordance with reality are possible. TLS gives the opportunity to obtain a big amount of observations, which on the one hand allows for an accurate depiction of the object, but on the other hand is troublesome during BIM developing. Therefore, the paper presents the methodol...

Biochar is being studied for few decades as it finds various applications in mitigating climate change, improving soil properties and water retention which subsequently potentially improves the crop yields. One of the parameters potentially predicting the crop yield is the crop density during the vegetation period as it represents the number of plants per area unit that can photosynthesize and potentially bring yield at the end of vegetation season. The paper presents the observations on the changes in canopy dens...

Public gardens and park zones are an important and widely visited component of urban spaces worldwide, however they can be polluted and even dangerous for humans and animals visiting them. The simplest way to screen the level of pollution of those green zones is to assess their ecological toxicity. In the present study, to assess the ecotoxicity of soil and ground samples obtained in 15 parks and public gardens in the city of Kazan (Russia) with 1 Mio citizens were investigated. Two elutriate assays with Ceriodaph...

The paper presents the results of research on the possibility of calculating the investment potential of a particular area based on its spatial characteristics. The level of spatial unit in this research is local administrative unit (cities or municipalities), while the geographic coverage is entire area of Republic of Croatia. Regarding the method, the results could be applied internationally and are not limited to national borders. Furthermore, when deciding on investing, it is important to know the risk. This r...

The paper deals with statistical analyses of data on soil properties of Pellic Vertisols selected from the eastern as well western part of the Upper Thracian Lowland, in Southern Bulgaria. Based on the survey in 2019, 2020 and 2021 at conventional and organic farming the data was processed using the statistical package Statgraphics (Anova). Soil textural class was the same a light to heavy clay and the total porosity was low. Natural variability of soils was due to imposed local separateness of organic farming fro...

Romula, the most important urban settlement of Dacia Inferior (Dacia Malvensis) province of the Roman empire during the 2nd and 3rd centuries A.D., was located in the present-day Resca village-Dobrosloveni commune, Olt County, Romania. Most of the Roman town remains are underneath Resca village premises, the areas suitable for archaeological or geophysical research being limited. This paper presents an integrated geophysical study carried out in the Central Fort zone of the archaeological site in September 2020, w...

The Varna and Beloslav lakes are the most strongly anthropogenized water bodies along the Bulgarian coast. At present, the lakes are again subject to deepening of the navigable channel, which significantly changes the quality of the habitats. An ecosystem approach was used to assess the status of the populations of fish species from the Varna-Beloslav Lake Complex. The paper's main purpose is to provide up-to-date information on the ichthyofauna of the largest northern Bulgarian Black sea brackish water bodies - V...

The main objective of the paper is to analyze and evaluate what are the manifestations and impacts of suburbanization in the hinterland of the city of Presov. The first manifestations of suburbanization started in 1996 and continue even nowadays. This process brings several consequences, economic, social, demographic, environmental, etc. When looking at migration flows, Presov has shown a long-term decline in population. The municipalities located in its hinterland show an increase in population. In this paper we ...

The aim of the research is to develop a method for betulin integration into electrospinning solutions to electrospun qualitative nanofibers webs morphology with high surface area and increase bioavailability. The main challenge in this study is to prepare betulin - containing electrospinning solutions with suitable concentrations due to limited betulin solubility in water and low alcohol concentrations. Tree concentrations of betulin extracts were obtained. The operation sequence to obtain electrospinning solution...

In the last years, composite materials are increasingly used in automotive, aeronautic, aerospace, construction applications. Composite materials have been used in aerospace in applications such as engine blades, brackets, interiors, nacelles, propellers/rotors, single aisle wings, wide body wings. The fields of use of composite materials have multiplied with the improvement of material properties, such as stability and adaptation to the environment, mechanical tests, wear resistance, moisture resistance, etc. The...

The aim of this study is to identify opportunities for the development of the bioeconomy in Latvia, assessing its role in the development of the agricultural sector. Nowadays, the development and sustainability of natural resources are of great importance. The bioeconomy can be considered as one of the oldest sectors of the economy, which life sciences and biotechnology can transform into one of the most modern sectors of the economy. From a number of perspectives, one of Latvia's development opportunities is the ...

In the practice of leading countries, digital transformation implies the industry principle of supporting the introduction of new technologies. At the same time, programs and projects can be built both on the principle of introducing any one promising group of technologies in several industries, where it is especially relevant, and provide for the digital transformation of a particular industry through the forced introduction of many technologically heterogeneous solutions that are in demand in a given sector of t...

The study of meteorological-climatic phenomena, especially of extreme phenomena that have become more and more frequent, has gained greater significance, given the increasing awareness of the importance of preventing material damage. Thus, monitoring and analysis of atmospheric risk phenomena helps local and national authorities whose duty is to protect the population and property of any kind, and early warning regarding the occurrence of such phenomena is useful to each individual. The western and north-western p...

The climate change is strongly affected by the increase of anthropogenic greenhouse gas emissions, such as carbon dioxide, methane, nitrous oxide, and fluorinated gases. Other important atmospheric factors of climate change are stratospheric sulfur aerosols, whose ability to reflect solar radiation back to the space cause cooling effect. Sulfur aerosols have common natural and anthropogenic origin. The volcanos are a major source of particles in the stratosphere, whose lifetime depends on various atmospheric proce...

The development of hypersonic technology creates a new challenge for inertial navigation sensors, which are widely used in aviation navigation systems. Improving the accuracy of navigation equipment will reduce fuel consumption and reduce the impact of harmful emissions on the atmosphere. The operation of sensors that are part of navigation systems, such as gyroscopes, work in difficult conditions, which affects their accuracy. A float two-degree angular velocity sensor is considered. The reaction of a float two-s...

The main objectives of this study are: analysis of the associated spectrum of the geomagnetic field, time of occurrence of geomagnetic storms and comparisons between recordings made at various geomagnetic observatories in the INTERMAGNET network, in terms of frequency intensity identified and correlations during geomagnetic disturbances. A geomagnetic storm is a temporary disturbance of the Earth's magnetosphere caused by ejections of solar corona mass, coronal holes or solar flares. The data used in this paper ar...

By developing this paper, we wanted to identify the opportunities for the growth and development of the Faget area in Romania, based on the specific resources available. Geographical location, natural and anthropogenic sites, as well as existing accommodation structures provide this area a high tourist potential. Natural landscapes, recreational areas, hunting, fishing, historical monuments, wooden churches, and natural resources are the most important attractions of the Faget area that can be valorised. The autho...

The European Green Deal has an overarching aim of making Europe climate neutral in 2050. The goal is to reduce EU's greenhouse gas emissions for 2030 to at least 50% and towards 55% compared with 1990 levels. Its goals extend to many different sectors, including construction, biodiversity, energy, transport and food and includes carbon tariffs for countries that don't curtail their greenhouse gas pollution at the same rate. On 18 June 2020, the Taxonomy Regulation for climate change mitigation and adaptation was p...

The first oil discovery from Romanian Black Sea area was in 1987, relatively late compared with the first successful Romanian onshore well, more than 100 years earlier. Starting from that moment and continuing till recent years, several discoveries were done; some are already put into production and some others are still in the exploration phase. In order to extract as much oil as possible and also to define new hydrocarbon reservoirs, it is mandatory to have a proper understanding of the petroleum systems from th...

According to ANSYS - developer of the Multiphysics platform for computer simulations - the FSI (Fluid-Structure Interaction) model can be used in all cases where a fluid encounters a solid structure, for example, wind gusts rotating a turbine, air washing the surface of a moving car etc. This method finds applications especially in the aeronautical and automotive industries, but also in medical research, such computer simulations track the influences of blood pressure and blood flow velocity in the veins. This pap...

Current challenges in the building industry are related mostly to the preservation of virgin/natural materials, decreasing the environmental footprint, and increasing the reuse rate of disposed materials. This paper reflects current trends in the use of secondary raw materials of various industrial processes as sources for the production of alternative materials, for example, alkali-activated materials (AAM). Specifically, the paper deals with the description of the basic physical and mechanical properties of fine...

In this article, the authors analyzed the importance of recycling and reusing components in hydraulic drive equipment in line with the principles of the circular economy. The circular economy is also based on the principle of 3R, Reduction, Reuse, Recycling and attempts are being made to implement this principle in all areas, in order to protect existing resources, which are limited. Unlike the economy of consumer goods where in time was used the principle of linear economy, where after manufacture and consumption...

This paper covers the activities of creating a database for the study of modern crustal movements in the region of Sofia and Southwestern Bulgaria, including data from GNSS measurements of the geodynamic network and the results of their processing and analysis, data from permanent stations and archive data from Synthetic-aperture radar, processing and obtaining interferometric images. The local archive of GNSS measurement includes: manual sketches of the location of the points; log sheets of the measurement with i...

Recently, the study of new methods of extraction from vegetable raw materials, such as ultrasonic extraction, microwave extraction and extracritical fluid extraction, has become widespread. The results of the study of ultrasonic extraction in the literature showed that this process provides higher selectivity, has a shorter duration, reduces energy consumption and harmful emissions into the environment. And it is also made in the equipment which design is much simpler than the equipment for pressing. In addition, ...

The COVID-19 outbreak has heavily influenced the way many businesses operate across all sectors linked to both changes in the consumer behavior, social-distancing restrictions and also the availability of resources and services (inc. public services) for businesses. These restrictions have influenced also the work of enterprises in the sector of bioeconomy - producers, processors and distributors of manufactured goods like food, clothing or home goods and other bio-based sectors both in the stages of primary produ...

Organic soil management and related climate and agriculture policy planning is emerging issue globally, at European Union (EU) level and nationally, especially for organic soil rich countries like Latvia and in a light of movement towards climate neutrality by 2050. Relatively small proportion of these soils by area significantly impact greenhouse gas (GHG) emission balance of many European countries including Latvia where organic soil management related GHG emissions make up to one third of GHG emissions associat...

The need for secure and reliable applications will increase due to the growing necessity for sustainably and independently produced energy. For example, the amount of energy generated by individuals at their homes will probably grow fast in the near future so requiring for easy-to-use and precise solutions. To transform and facilitate the processes related to energy sector it is possible to use blockchain technology. The aim of this paper is to evaluate and analyse different areas of blockchain application in the ...

In order for life to arise and exist on earth, a number of important processes take place in it, based on various elements. One of these elements is nitrogen (N). Nitrogen is the most common element in the atmosphere approximately 78% of the atmosphere consists of nitrogen gas (N2), but in this way, the majority of the living organisms cannot absorb nitrogen. Nitrogen fixation occurs during the nitrogen cycle and results in a number of complex organic compounds required for living organisms. During the nitrogen li...

Economic growth in Europe is causing environmental problems thus highlighting the need to minimize waste. Sustainable Development Goal 12 -Sustainable Production and Consumption- focuses on three aspects: waste management, energy saving and resource usage minimization. The aim of this study is to analyse the current needs for professional food waste management knowledge in European food production companies and develop waste minimization skills for food sector-s vocational education students. The study is based on...

Currently the resources of rare metals, especially Ta, Nb, Be, and Li used in high-tech industries, are of great demand in Kazakhstan and worldwide. Main Ta, Nb, Be, Li, Sn, and W deposits in the Great Altai territory are hosted by Permian granitic belts that formed during the Late Paleozoic-Early Mesozoic orogeny, in a postcollisional setting. The largest metallogenic structure of the Kalba-Narym granitoid belt accommodates many genetically different deposits and occurrences. Pegmatitic rare-metal deposits have v...

From time immemorial, the oceans, seas and their coasts have been the cradle of human civilization and still play a vital role in the lives of millions of people, indirectly affecting all of humanity. The phenomenon of coastalization suggests that our reliance on and dependence from marine and maritime sectors will grow, and their sustainable development is a topical challenge. The Blue growth strategy addresses this issue on a Pan-European level, fostering research and innovation with regards to marine environmen...

Utilization of renewable energy sources is future solution for providing the word energy demand and to solve the problems of climate changes. Carbon dioxide is greenhouse gas and major contributor to the global warming. Hydrogenation process of carbon dioxide with renewable hydrogen will not only mitigate the problem of global warming but will also produce valuable products and renewable energy. The hydrogenation of carbon dioxide to value-added chemicals and fuels is a promising route, providing products such as ...

This study is focused on influence of graphene nanoplatelets as additive in magnesium oxychloride cement (MOC) paste. This material composed of light-burned magnesia, prepared at lower temperatures than ordinary Portland cement (PC), is considered as its eco-efficient low-carbon alternative with properties comparable to high-performance concrete such as high mechanical resistance, stiffness., and low porosity. Two composite pastes were prepared, reference paste and paste enhanced with graphene, and subjected to se...

Geographic Information Systems (GIS) are solutions that cover a wide range of fields, from the management of urban resources, the introduction of satellite tracking and coordination of roads routes, tourism, civil protection, logistical support in case of natural disasters, land records, management of agricultural farms and forest fund, etc. At present there are many uses of science applied in society and which provide decision support for many beneficiaries - companies, public authorities. Thus, GIS with urban ap...

The importance of land assessment activity consists in the fact that the data provided by these studies constitute the basic documentation for establishing the most appropriate practical measures for protection, improvement and rational use of soils for biomass production in an optimized and rigorous dynamics. correlated with the growing demands of environmental protection. The evolution and fertility of soils is conditioned by a large number of their individual properties and by many specific processes that take ...

The waste management sector as one of the most significant economic sectors requires effective management not only in Latvia but in the European Union as whole. According to the recent (2020) available Eurostat data, 505 kg of municipal waste per capita were generated in the EU of which 48% were recycled and 22% were landfilled. Latvia ranges in the 11th position among the EU Member States with 478 kg of generated waste per capita. Romania (287 kg), Poland (346 kg) and Hungary (364 kg) are countries having generat...

Forest fires cause major damage to human habitats and forest ecosystems. Early detection may prevent serious consequences of fast fire spread. Although there are many smoke detection algorithms employed by various optical remote sensing systems, there is still a major misdetection of images containing fog. Fog exhibits similar visual characteristics to smoke. Furthermore, when monitoring dense forests many smoke detection algorithms would fail in robust recognition due to fog covering the trees at dawn. There have...

The paper addresses the sustainability of technological transport, specifically the transport of materials by pipe conveyors. Environmental aspects must also be addressed as part of the solution to the sustainability of pipe conveyors. Pipe conveyors are suitable for the efficient transport of large volumes of bulk material with a minimum of environmental pollution. Closed rubber conveyor belts are a basic structural element of pipe conveyors. These types of conveyor belts have to resist a combination of factors s...

Environmental impact assessment is a complex scientific process that often exceeds procedural and legislative aspects. The data and information used in the EIA derive from various sources, so they must be integrated using an appropriate methodology. The established assessment methods are Rapid Impact Assessment Matrix (RIAM) and Geographic Information System (GIS), each allowing the integration of observations, data, and environmental information. The present study aims to apply RIAM and GIS to the impact assessme...

Food waste is a growing global concern, with the attention of major global organizations focusing on monitoring and finding solutions to optimize it. According to the latest data published by the National Institute of Public Health on this topic (2019), in Romania, food waste is estimated at 6,000 tons per day 49% from households, 37% from the food industry, 7% from retail, 5 % of public catering and 2% of the agricultural sector. In this context, it was proposed to implement a system based on reducing waste and w...

Many processes involving dusts, suspended or accumulated, have the potential to lead to fire, explosion or decomposition in the presence of oxygen and an ignition source. The risk of dust explosions increases as more and more products take the form of dusts or require the use of dusts during manufacture. In spite of extensive research and development to prevent and mitigate dust explosions in the process industries, this phenomenon continues to represent a constant hazard to industries including manufacturing, usi...

Previous studies have shown that secondary school students may have misconceptions about geological scientific information. By the end of secondary education these misconceptions may remain unresolved. As a result, students enter university studies and still hold them. Students of engineering, as for example civil engineering, are no exception. The aim of this study was to investigate and analyse misconceptions of this specific target group. A closed questionnaire was designed and given to 102 University students ...

The most significant challenges of organic farming are the fragmentation of the sector, unstable product supply and sales opportunities, as well as the lack of knowledge of how to manage agricultural production agronomically and economically effective. The predominant form of agricultural enterprises in Latvia is small and medium-sized farms. Thus, cooperation is an effective solution so that farmers can maintain the form of a family business and achieve an appropriate economic market, which would contribute to th...