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This paper is focused on the verification of two quasi-geoid models for the territory of Bulgaria (the model integrated into the Geodesy, Cartography and Cadastre Agency (GCCA) official product for the transformation of geodetic data and a model derived using the GNSS/levelling method) through direct geodetic measurements. The study was developed in the framework of the current 5th cycle of the 1st Order National Levelling Network (NLN), conducted in accordance with the requirements of the new 2021 Instruction [1]...

This paper focuses on the comparison of the energy potential of biomass originating from agricultural and viticultural production, with emphasis on its utilization in the form of pellets. Selected types of agricultural residues and viticultural wastes were analyzed, specifically grape pomace skins and pruning residues from vine cutting. These materials represent underutilized by-products with significant potential for energy recovery. The main objective is to evaluate the suitability of these materials as alternat...

The monitoring of the construction behavior is one of the important activities carried out to determine the state of construction, subject to various natural and anthropogenic actions at a given time. In Romania, the activity of rockfill dams monitoring is regulated according to the importance category (A, B, C). The Rausor Dam is located downstream of the confluence of the River Rausor with the river Targului, which springs from the Iezer - Papusa Mountains in the central part of Romania. Being part of importance...

Arbuscular mycorrhiza, a widespread mutualistic association between fungi of the phylum Glomeromycota and plant roots, plays an important role in improving plant nutrition and tolerance to environmental stress. Through this symbiosis, fungi supply mineral nutrients and enhance resistance to drought and pathogens, while receiving assimilates from the host plant. This study was conducted on a commercial plantation of blueberry (Vaccinium corymbosum) in southwestern Slovakia. The plantation was inoculated with mycorr...

The article presents data on the role of organic matter as the primary source of oil and gas formation. It provides a general overview of scientific research on the theory of the organic origin of hydrocarbons. The methodological part of the study is based on guidelines for determining the distribution patterns of organic matter in formations of various types, using the values of the formation-equivalent. The formation-equivalent is understood as the aggregation of all forms of organic matter of any type into a co...

Existing industrial ammonia production installations operating in potentially explosive atmospheres usually contain a wide range of explosion protection concepts implemented during different stages of plant modernization and expansion. In such brownfield installations, the coexistence of equipment originating from different technological periods often leads to a non-uniform distribution of protection concepts at installation level. This aspect is particularly relevant for industrial sectors associated with oil and...

In the context of the transition to a hydrogen-based economy, the assessment of the risks associated with this energy vector is becoming a priority for industrial safety. The unique properties of hydrogen, its high reactivity and high burning rate, require the use of advanced numerical simulation tools, capable of providing highly accurate predictions of the effects of explosive phenomena. This paper presents methodological contributions aimed at optimizing the numerical models used for the analysis of explosions ...

The main aim of this paper is to present the research findings in the field of solid biofuels production from biomass. One of the recovery possibilities for waste biomass raw materials is production of solid biofuels. Using a variety combination of influencing variables can be improve the final quality of solid biofuels. Raw biomass material variables influence, especially (type of raw material, particle size, moisture content, compression pressure and compression temperature) can be recognized during the producti...

This paper describes the controlled demolition of a reinforced concrete water tower located in an industrial area in Lugoj, Romania. Due to advanced structural degradation and high rehabilitation costs, demolition was selected as the most viable solution. The adopted method combined blasting works with conventional preparatory operations, using a controlled toppling technique in a predefined direction. A detachment wedge was created by drilling and charging 196 boreholes arranged in eight horizontal rows, initiate...

Dust sampling equipment exhibits significant variations over time depending on the operating principle, being influenced by interaction of environmental factors, such as air flow velocity, relative humidity, ambient temperature and barometric pressure. The objective of this study is to perform a comprehensive comparative evaluation between the gravimetric reference method and the optical method for determining PM10 particles in ambient air. In order to allow the evaluation of each observation in relation to method...

ABSTRACT The nutritional composition for different healthy and/or diet purposes needs an appropriate composition of ingredients. But the different food products contain different levels of nutritional gradients. Therefore, the cost minimization of the food supplies and the composition of the ingredients in an appropriate combination can be a target from an economic point of view. The paper quantifies the relationships between food supply and the composition of the ingredient procedure by means of minimizing the su...

A health-friendly crop rotation system for soil is an essential tool for sustainable agriculture, especially in the context of achieving the objectives of the European Green Deal. Therefore, the research aims to assess the integration of three crops beneficial to soil health into the production of winter wheat and winter rapeseed every third year and their socio-economic and environmental impacts in Latvia. The research results revealed that crop rotation has a significant impact on the economy of farms, and only ...

Ornamental plants of the family Poaceae are becoming increasingly popular in modern landscape design due to their high ornamental value, ecological resilience, and adaptability to various soil and climatic conditions. The biological features of growth, habit formation, and methods of reproduction in different climatic conditions were studied. During 2023-25, research was initiated at the Kherson SAEU focusing on the cultivation of grass planting material via seed and vegetative propagation, specifically for Pennis...

Unmanned aerial vehicles (UAVs) are increasingly used in many industries and environmental monitoring systems. They play a particularly important role in the observation and research of difficult-to-access areas, such as watercourses, river basins, reservoirs, and wetlands. The ability to quickly measure basic physicochemical parameters of water, such as temperature, electrical conductivity, pH, and turbidity, is crucial for assessing the condition of the aquatic environment and initiating appropriate actions. The...

This paper presents the design and numerical analysis of an experimental system intended to study the effects of water curtains on the propagation of hydrogen explosions. The developed virtual model reproduces a test stand consisting of three successive chambers separated by two water-filled barriers acting as water curtain obstacles. The atmosphere in the chambers is composed of an explosive hydrogen–air mixture with a hydrogen concentration of 25%. The explosion is initiated in the first chamber, and the propa...

The rapid pace of urbanization, demographic transformation, and climate-related challenges has intensified the need for inclusive and sustainable urban spaces that respond to the needs of diverse communities. Contemporary cities are increasingly characterized by social, cultural, economic, and demographic heterogeneity, requiring urban planning approaches that integrate social equity, environmental sustainability, accessibility, and participatory governance. This study explores the theoretical and practical dimens...

Civil aircraft navigation uses specific procedures for the continuous determination of the aircraft position using the path and distance traveled in the considered time interval as calculation elements. Throughout the route, errors must be estimated that are generated by a series of parameters such as: hydrometeorological conditions, air current direction, declination, geoid parameters, the ship's nautical qualities and the response mode of the navigation equipment. The indications of the magnetic compass must be ...

Climate change has become one of the most urgent global challenges of the twenty-first century, affecting natural systems, urban environments, economic stability, food security, and social resilience. In this context, climate literacy has emerged as a critical educational priority, particularly within GeoScience education, where understanding Earth systems, environmental processes, and human-environment interactions forms the foundation of academic and professional training. Developing climate literacy involves no...

The building and construction sector remains one of the largest contributors to global climate change, thus the industry is focusing on reducing the embodied emissions from materials and minimizing operational energy through superior building envelope performance. As the industry transitions from traditional products to advanced bio-based materials, the requirements for measurement precision, dynamic response tracking, and environmental simulation have surpassed the capabilities of legacy instrumentation. Modern l...

The proposed presentation details a newly developed well integrity packer solution that provides a permeant non-elastomeric barrier and can be installed as easily as existing technologies, but offers the unique advantages of a permeant cement barrier. Traditional elastomeric swell packers are a practical, easily installed and proven well construction product, but they have their performance limitations, especially over a well’s lifetime. The cementitious swell packer (CSP) is a product intended to supplement or ...

This study investigates the development of gravel-gelatin composites as pre-formed monolithic filter elements for borehole wells in unconsolidated sandy aquifers. The composites utilize food-grade gelatin as a natural, biodegradable, and low-cost binder to bond gravel particles into stable blocks, offering an alternative to conventional loose gravel packs that are labor-intensive to install and prone to placement inconsistencies. A systematic experimental approach was employed to optimize key manufacturing paramet...

The presence of flammable and/or combustible substances in various industrial production processes generates in most cases potentially explosive atmospheres, which transforms a regular work environment into an explosion risk area, directly influencing the way in which equipment intended to be used in these areas is designed, installed and maintained. In areas where potentially explosive atmospheres may form due to the presence of flammable and/or combustible substances, technical equipment must be used whose casin...

The article examines current trends in the development of land legislation in Ukraine under the conditions of climate change, the legal regime of martial law, and the challenges of post-war recovery. It is substantiated that the traditional model of land law regulation, primarily focused on the economic function of land as a means of production, is no longer sufficient in the context of increasing climate risks, soil degradation, disruption of ecosystem balance, and the large-scale impact of war on the land fund. ...

Natural gas leaks in residential buildings represent a major risk of explosion and fire, endangering lives and property. Current detection systems, predominantly individual and non-centralized, exhibit significant limitations regarding response time, precise leak localization, and effective notification of authorities. This paper proposes the architecture of a centralized system, based on Internet of Things (IoT) technology, for the real-time monitoring of methane (CH4) emissions in medium-sized multi-family resid...

Potentially explosive atmospheres constitute a major risk in the operation of industrial installations that use or generate gases, flammable vapours or combustible dust. According to ATEX legislation, explosions can occur as a result of the interaction between an explosive atmosphere and an active ignition source. Even under the conditions of using ATEX-certified equipment, the progressive degradation of the components can lead to the appearance of uncontrolled ignition sources. This paper analyzes from a technica...

This research presents a comprehensive assessment of surface deformation at the Paute Integral Hydroelectric Complex, one of Ecuador's most critical energy infrastructures. Given the complex Andean topography and the strategic importance of this asset, monitoring ground stability is essential for operational safety and structural integrity. This study utilized Differential Interferometric Synthetic Aperture Radar (DInSAR) techniques, employing a decadal Sentinel-1 dataset from 2014 to 2024. The methodology integra...

The transition toward sustainable development and climate neutrality has intensified the implementation of environmental policies across the European Union (EU), including carbon taxation, emissions trading systems, renewable energy subsidies, green taxation, and regulatory measures aimed at reducing greenhouse gas emissions. While these policies are essential for achieving environmental sustainability and the objectives of the European Green Deal, growing concerns have emerged regarding their potential social con...

The processing chain in open-pit mines is a complex and quite often a challenging procedure. With a multistage process to obtain a finished product which can be used later in aggregates or construction industry there also a need to create a compounded processing plant with heavy duty machinery and with a labyrinth of locations. That can be confusing and frustrating at first for new employees or for trainees. Moreover addressing the statistics the mining industry in Poland has one of the highest accident rates amon...

The global transition toward renewable energy has become one of the most significant economic and environmental transformations of the twenty-first century. Driven by climate change mitigation goals, energy security concerns, technological innovation, and international sustainability commitments, emerging economies are increasingly investing in renewable energy systems such as solar, wind, hydropower, biomass, and geothermal energy. However, the economic implications of this transition are complex, involving struc...

Modern cities are dynamic and constantly evolving systems in which economic activity, engineering infrastructure and social processes are closely interconnected within a common urban rhythm. However, the expansion of urbanized areas is accompanied by the aggravation of a number of problems, including the aging of public utilities, congestion of transport networks and the increasing frequency of hazardous meteorological events. Together, these factors create threats that can disrupt the functioning of the urban env...

Bacterial infections are among the most common infectious diseases. Antibiotics have been a crucial approach in preventing and treating human bacterial infections for the past century. These powerful medications effectively combat specific diseases and potentially save lives. Antibiotics destroy bacteria or inhibit their reproduction and spread. After the breakthrough discovery of penicillin, a wide array of antibiotics has been subsequently uncovered. Although antibiotics remain the primary treatment, many bacter...

Portland cement–based materials represent the most widely used construction materials worldwide. However, their production and application are associated with significant environmental burdens, including high CO2 emissions and the depletion of natural aggregate resources. In response to the growing demand for environmentally responsible construction solutions, this study focuses on the development of building materials based on an alternative binder. Magnesium oxychloride cement (MOC) is considered a more sustai...

The aim of this study was to analyze the impact of wheat sourdough product (powder form) on wheat flour dough rheological properties. Wheat sourdough (SD) was obtained from fermented wheat flour which allows bakers to obtain a healthier, nutritious, tastier and better flavor bread without high fermentation phases. The impact of SD (1-4%) on dough rheological properties have been analyzed using Mixolab according to the standard method ICC No. 173 and HAAKE MARS 40 rheometer (Termo-HAAKE, Karlsruhe, Germany) for osc...

Percussive-rotary drilling remains the preferred method for penetrating hard abrasive rocks (UCS > 150–350 MPa) in mining, exploration, and geotechnical applications. Tungsten carbide (WC-Co) inserts, with their exceptional hardness and abrasion resistance, serve as the primary cutting elements, enabling efficient rock fracturing through combined impact and shear. This study examines tool performance, wear mechanisms (abrasive grooving, fatigue spalling, binder erosion), and optimization strategies including car...

Nowadays the communication is made mainly through electronic devices. These devices produce electromagnetic radiation that influences the quality of the sent signal. Also, health problems are generated due to the time spent in an electromagnetic medium that emits radiations. This paper presents some of latest screen developments regarding electromagnetic screens, advancements in shielding materials.

Ongoing miniaturisation of scientific instrumentation, combined with the development of autonomous research platforms, increasingly favours small, remotely operated vehicles capable of carrying out extensive geophysical surveys with minimal logistical overhead. This work presents the concept and prototype of Energetic Horizon, a mobile field module dedicated to preliminary geological reconnaissance and to assessing the resource potential of a surveyed area. The proposed solution integrates two complementary measur...

Thermoelectricity is a green, renewable energy technology that uses the Seebeck effect to convert waste heat directly into electricity. Cobaltites have great potential for use in thermoelectric generators due to their environmental friendliness, good thermal and chemical stability, and relatively low raw-material costs. Improving the thermoelectric performance of cobaltites using suitable dopants could expand their application potential. This study investigated the effect of bismuth oxide (Bi2O3) and bismuth borat...

Since the beginning of the 21st century, the development of the concept of the circular economy and its integration into regional sustainable development have highlighted the necessity of incorporating the principles of the circular economy into policy frameworks. This integration primarily emphasizes circular supply chains and examines the influence of existing legislative frameworks on the application of innovations within the realm of sustainable development. The objective of this study is to review the mechani...

This study addresses the physical security vulnerabilities of high-risk industrial facilities in the Czech Republic, focusing on the intersection between the Seveso-III Directive and the regulation of private security services (SBS). The objective of the paper is to answer the main research question: What legislative and organizational instruments can optimally integrate the future national Private Security Act with existing environmental protection frameworks to protect industrial facilities against physical sabo...

There are over 730 level crossings in the Bulgarian railway network. At these points, due to the intersection of rail and non-rail transport, there are prerequisites for accidents, which sometimes end fatally. The problem is exacerbated when the railway line is under repair, but train traffic is not stopped. This paper examines the measures that must be taken to ensure traffic safety during repairs. Two level crossings in operation on the Sofia – Dragoman line were examined. A critical analysis of the actual con...

In real navigation, a ship is subjected to the influence of wind, which for ships with a large windage area results in impaired maneuverability, especially in presence of strong and sudden gusts. In such conditions, environmentally critical situation may arise, such as a ship’s inability to perform an adequate maneuver when entering a restricted area, posing a risk of collision with another object or grounding in shallow water. This requires the study of the parameters of non-stationary wind impact using indicat...

In recent years, with the interest in healthy diet and environmental protection, plant-based alternatives, to classic milk, have been developed and produced. In addition to the already well-known products, such as almond or soy milk, amaranth milk is also becoming increasingly known. Amaranth milk is considered a possible alternative with both nutritional and ecological benefits. As a result of environmental problems and people's needs, this paper aims to compare these types of plant-based beverages, in terms of c...

Blasting operations are an essential part of underground mining activities, but the seismic waves generated during detonation may adversely affect the stability of underground mining structures such as galleries, chambers, intersections, and support systems. Repeated blasting can lead to cumulative damage, increasing the risk of degradation of both the rock mass and the installed support. This paper presents considerations regarding the assessment of the seismic effects of blasting operations on underground mining...

The study is devoted to evaluating the application of remote sensing data (satellite images, orthophotos, etc.) in spatial development planning. The amount of data available today provides extensive opportunities for territory analysis, but in practice their use is often limited. The work analyses how such data can improve land use monitoring, understanding of urbanization processes and decision-making at various planning levels. The main problems are related to the different quality of data, spatial and temporal ...

Lime mortars are widely used in the construction, repair, and conservation of historic masonry due to their compatibility with traditional materials and their flexible, porous structure. However, their relatively low mechanical strength compared to modern cement-based materials has led to efforts to enhance their performance, for example through fibre reinforcement. This study examines the effect of two types of natural fibres (bovine and goat) on the physical, mechanical, hygric, and thermal properties of lime–...

Nowadays, the use of eco-friendly additives in drilling fluids to improve the rheological properties is widespread. This work aims to study the evaluation of rheological properties of drilling fluid suspensions contained Algerian Na-Bentonite and potato starch PS as viscosifier with different concentrations (0.6%, 1.2% and 2%) depending on the aging time. After the trials of aging, the possibility to ameliorate rheological properties of drilling fluid suspensions using an eco-friendly environment additive which is...

This study investigates experimentally the influence of dust thermal conductivity on the maximum surface temperature of Ex equipment operating under dust layer conditions at a fixed dissipated power of 3 W. Experiments were conducted using a purpose-built resistive test sample, designed and manufactured at INCD INSEMEX, tested with two dust materials representing boundary conditions of thermal behaviour: vermiculite, selected as a worst-case insulating material, and Portland cement dust, selected for its industria...

As is well known, hydrogen exhibits a wide flammability range, low ignition energy, and high diffusivity, which create significant explosion risks in storage and handling facilities. Therefore, the development of effective methods and devices for the detection and control of hydrogen explosions is essential to ensure operational safety. This paper presents the development and experimental validation of an explosion control device intended for hydrogen storage systems. The proposed device is based on an optical ult...

Spatial data infrastructure is an essential tool for the management, planning, and analysis of sustainable development. The Latvian ecosystem, which consists of numerous decentralized resources, has successfully established a foundation by fulfilling the requirements of the European Union's INSPIRE and Open Data directives. The transition from a culture of viewing 'paper maps' to the automated machine processing of standardized, vectorized, and semantically rich data represents the primary benefit. To evaluate and...

Drilling muds commonly use organic polymers as viscosifiers or mud filtrate reducers. While these polymers are effective, they are also costly, contributing to higher operational expenses in oil well drilling. They play a crucial role in the success of drilling operations and help enhance various properties, particularly rheological characteristics. Due to environmental concerns, these polymers have become essential in water-based drilling fluids, serving as alternatives to oil-based muds. The present study aims t...