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This paper addresses the problem of integrating circular economy (CE) principles into production planning processes in high-mix manufacturing environments. Although environmental indicators are increasingly monitored in industrial practice, their role in operational planning decisions remains limited. In many cases, data collection is not followed by its effective use in decision-making processes. The aim of the paper is to present an author-developed conceptual approach that enables the transition from monitoring...

Three-dimensional terrain reconstruction for applications such as geodetic modeling and spatial analysis remains challenging when GNSS-derived observations are sparse, distributed primarily along road networks, and referenced to a vertical reference system different from that of the available digital terrain models (DTMs). This study presents a methodology for integrating GNSS-derived road observations with raster-based terrain models to reconstruct continuous and geometrically consistent terrain surfaces while pr...

Drilling fluid properties – density and rheology (plastic viscosity, yield point, gel strength) – are essential for wellbore stability, pressure control, hole cleaning, and minimizing non-productive time (NPT) in oil and gas drilling. Traditional manual methods (pressurized mud balance, Fann 35 viscometer) are periodic, labor-intensive, and delay corrections, increasing risks of kicks, lost circulation, and instability. This study proposes an intelligent automated system for real-time monitoring and control us...

Crowdsourced macroseismic data provide an important complement to instrumental earthquake catalogues, especially where the spatial distribution of felt effects is influenced by population density, local site conditions and building vulnerability. This study presents a preliminary intensity-distance attenuation analysis based on EMSC crowdsourced macroseismic reports for Albania and nearby border areas during 2012-2026. The compiled database contains 694 earthquakes and 212,140 corrected macroseismic intensity poin...

Agriculture is increasingly affected by climate change, soil degradation, and the need for sustainable land management, creating demand for advanced decision-support tools capable of integrating heterogeneous spatial and management data. The aim of this contribution is to introduce a system for parcel-specific agricultural advisory based on the integration of GIS, LPIS data, expert methodologies, and AI-driven analytical workflows. The system is designed as a modular web-based platform with a chat-oriented interfa...

The paper focuses on the development and implementation of the course “Green Infrastructure” within Landscape Engineering programmes, with an emphasis on strengthening practical education. This reflects the growing importance of green infrastructure in sustainable landscape management, spatial planning, and environmental protection. Green infrastructure represents a strategically planned network of natural and semi-natural areas providing ecosystem services such as biodiversity conservation, climate regulation...

Organic fibrous materials are among the promising building materials from the perspective of sustainable development, because easily renewable resources or secondary raw materials are used for their production. Currently, materials based on recycled textile fibers are of increasing importance, especially within the EU with regard to the requirements of Directive (EU) 2018/851 of the European Parliament and of the Council on waste. However, the problem with textiles is their diversity and combination of polymeric a...

The present study investigates water consumption patterns in 11 secondary and high school buildings in Sofia, Bulgaria, and evaluates the adequacy of the current regulatory requirements for this category of public buildings. Water consumption and pressure were monitored at one-minute intervals during two annual two-week measurement campaigns for each facility, resulting in a database covering 368 days. Water losses were identified through minimum night flow analysis and excluded from the assessment of effective wa...

This report represents an attempt to examine the investment attractiveness of the industrial real estate market in Bulgaria. To achieve this, financial analysis was used and an original ROI model was constructed. This allows comparing and positioning the country to the leading markets in Central and Eastern Europe (CEE) - Poland, the Czech Republic, and Romania. The study is based on verified secondary empirical data from Cushman & Wakefield/Forton, Colliers, and JLL, using published market indicators for Q4 2024 ...

Renewable energy has a vital role in reducing greenhouse gas emissions and other forms of pollution, as well as in increasing a countrys security of energy supply. A 20% share of renewables could mean avoiding 600-900 MtCO2 (million tonnes of CO2) per year. Renewable energy can be used in the electricity generation, heating and cooling, and transport sectors. The purpose of this study is to analyze the trends in the field of renewable energies in the Republic of Moldova. Introduction Agriculture remains a strategi...

Landslides represent one of the most significant geohazards affecting infrastructure settlements agricultural land and public safety in Kosovo This study presents geological monitoring and preliminary geoengineering assessment of several active landslide zones identified in the municipalities of Klin Istog Gjakov and Pej The investigated localities include Llazinc Zllakuqan Vrell Crmjan Sig Dushkaj and the PejKull road axis The research is based on field investigations geomorphological observations geological mapp...

Leadership effectiveness is a key driver of organizational success, especially in emerging economies undergoing transformation. This study examines how leadership behaviors influence managerial decision-making effectiveness among business leaders in Kosovo, focusing on supportive and directive behaviors, leadership style, and decision-making competencies. Using a mixed-methods approach, data were collected from 82 leaders across micro to large enterprises in production, trade, and service sectors. Quantitative ana...

Lean management has long transcended its origins in the automotive industry and is increasingly recognized as a leading philosophy for managing organizations across both manufacturing and service sectors. Its emphasis on waste elimination, continuous improvement, and value creation has proven adaptable to diverse operational contexts. The aim of this article is to compare selected cases of lean management implementation in the shipbuilding industry with those in the automotive sector. The study analyzes key dimens...

Europe’s transition towards a circular green economy is accelerating, highlighted by the urgent need for sustainable alternatives to fossil fuels. While conventional electric vehicles present a viable solution, their manufacturing heavily relies on critical raw materials. The Zephyr AGH project addresses this environmental challenge by developing an innovative, lightweight hybrid vehicle designed to minimize both energy consumption and material dependency. The powertrain architecture utilizes an electric motor a...

The paper aimed to present the quality of some soils from the West Region from Romania. The soil types who were studied occupied a surface of 4.013 ha in Arad Department. The main soil types who was founded in this area is Chernozems on 75.54% from the surface, Haplic Phaeozems on 2.43% from the studied surface, Pelosols on 7.66% from the surface, Vertisols on 13.15% from the surface, Gleysols on 0.36% from the surface and Solonetz on 0.86% from the studied surface. This paper presents a synthesis of the limiting ...

This investigation evaluates the biocatalytic efficacy of oxidases, more specifically lipoxygenase, on the physicochemical and rheological dynamics of wheat flour matrices. A systematic review of current literature highlights the multifaceted functional advantages of lipoxygenase incorporation across diverse wheat cultivars. Empirically, lipoxygenase significantly modulates dough rheology, concurrently enhancing extensibility, viscoelasticity, deformation resistance, and hydration capacity. Furthermore, we elucida...

The study area is located at the Gobi Desert of southern Mongolia, near the town of Byankhongor. During the work stage, aerial photo image interpretation was undertaken to identify and delineate lithological boundaries, geological contacts, and fault and fold features, lineaments. Aerial photo, Aster, and Landsat TM have been used for the geological interpretation of the Shine Jinst area, Mongolia. Nineteen stratigraphic units were distinguished and correlated to delineate the stratigraphic subdivisions. A study o...

The main objective of this study is to outline the spatial distribution of precipitation deficit at both monthly and annual scales by comparing precipitation data from two reference periods: 1961–1990 and 1991–2020. To achieve this goal, monthly and annual precipitation normals from 355 meteorological stations throughout the country are calculated in accordance with the World Meteorological Organization's standards. Data post-processing, statistical analysis and spatial interpolation are performed in the R env...

Prioritizing objectives amid the energy crisis and energy transition requires finding solutions that balance energy affordability with economic competitiveness, while gradually reducing fossil fuel use and promoting renewable and low carbon sources to meet greenhouse gas reduction targets. Currently, industry widely utilizes energy-efficient equipment for heating that relies on natural gas. To support the energy transition outlined in the National Energy Strategy, this paper proposes the study of an experimental r...

UAV photogrammetry is well established in Slovak geodesy across all aspects of surveying work. To a lesser extent, it is also used for the purposes of the Slovak Land Administration System (LAS). The aim of this study was to analyze the advantages and disadvantages of obtaining coordinates of breakpoints of ownership boundaries from data acquired by UAV photogrammetry. Data collection took place in 2025 in the cadastral area of Pac, covering an area of 0.703 square km. The survey work lasted 4 hours using a DJI Ma...

Earthquakes are unevenly distributed in space. Seismic events are predominantly concentrated within well-defined seismic belts, many of which coincide with the boundaries and interaction zones of major tectonic plates. These zones represent areas of accumulated stress and active geodynamic processes, where earthquake generation is most frequent. In seismically active territories such as Bulgaria, earthquakes constitute one of the most significant natural hazards due to their potential societal and infrastructural ...

Environmental pollution with microplastics is a global concern, accompanied by a large body of research primarily focused on aquatic environments. Microplastic contamination has a considerable impact on both the biological diversity of aquatic ecosystems and human health. In this context, the present paper provides an overview of technologies and measures aimed at reducing the presence of microplastics in surface waters, emphasizing two complementary approaches: the removal of microplastics from transfer pathways ...

In terms of its influence on human health, noise has a significant effect. One type of noise is generated by tire/road contact while a vehicle is in motion. This noise is monitored and analyzed using the CPX (Close-ProXimity) method according to ISO 11819-2, in which microphones are used to measure the noise generated by a rolling reference tire. The level of this type of noise is determined by various factors. One of these factors is the macrotexture of the road surface, that is, the texture of the road surface a...

This study investigates the transport dynamics of heavy metals and metal-containing nanoparticles from mining-affected areas through major Georgian river systems into the Black Sea, with a focus on environmental risk assessment. Mining activities in Georgia represent a significant source of metal contamination, influencing both dissolved and particulate phases within riverine environments. A spatial monitoring approach was applied along upstream–downstream gradients to evaluate the distribution of metals in wate...

Modern architecture and materials science are searching for new materials that are environmentally friendly and sustainable. These materials ensure a high quality of life and high energy efficiency in buildings. In addition to operational characteristics, the technological aspects of their production are important. This includes high mold turnover, ease of material fabrication, and the cost of obtaining them. These requirements can be met through the use of additive manufacturing for the production of buildings an...

Celery (Apium Graveolens var. Rapaceum) is a tasty and aromatic vegetable, part of the Apiaceae family. It is an important horticultural crop, being rich in nutritional value. It is cultivated worldwide both for food and for use in the pharmaceutical industry. This medicinal vegetable hosts a valuable source of minerals, vitamins, antioxidants, pigments, aromatic compounds, organic acids, tannins. The aim of this study was to determine the mineral composition of celery root using X-ray fluorescence (XRF), but also...

The present study aims to develop methodological approaches for the investigation of fine-dispersed gold in ores from primary (bedrock) deposits and placers, with the objective of improving recovery efficiency. The type of gold under investigation exhibits a number of distinctive characteristics that substantially differentiate the conditions of its concentration, distribution within ore horizons and bodies, and the reliability of its analytical determination using conventional methods from those applicable to sma...

In this paper is presented a Mobile Integrated System for on the Site Testing (MISST) of equipment intended for use in potentially explosive atmospheres, with type of protection pressurization p, resulting from research activities out by the research and testing team involved. The fundamental aspects of the design, implementation and easy use of such an integrated system have been examined, implemented and tested. A mobile integrated test system for Ex p type of protection applied to equipment in Ex construction, ...

The Akshabulak and Aryskum structures, located within the Aryskum depression of the South Torgay sedimentary basin, are among the most thoroughly investigated hydrocarbon-bearing areas in Kazakhstan. The discovery of several oil and gas fields in these structures was facilitated by seismic surveys conducted between 1986 and 1988. The present study aims to develop predictive exploration models based on the analysis of density heterogeneities and the distribution of horizontal lithostatic pressure components derived...

The volume of accessible groundwater in Latvia from a chosen aquifer is generally sufficient for a household or company to install a borehole with a flow rate of 10 m3/day or 100 m3/day. In this case, the main legal restrictions concern lowering the groundwater table to the minimum permissible level and the required water level reserve relative to the top of the well's filter column. Latvia is rich in groundwater water; for decision-makers to install a water intake well, it is usually sufficient to analyze data fr...

This study investigated a nondestructive, remote-sensing-based testing method for detecting harmful wetness in immovable cultural heritage structures using unmanned aerial vehicle multispectral imagery combined with machine learning algorithms. The multispectral data were captured over a historic building with DJI Mavic 3M UAV, and supervised machine learning classifiers were applied to identify moisture-risk areas across the building’s facades. The spectral range of the employed multispectral sensor did not all...

Accurate monitoring of crop phenology is essential for yield estimation, growing season modeling, and climate adaptation in agriculture. While freely available satellite archives provide broad spatial coverage, their temporal frequency is often insufficient for capturing the rapid phenological transitions characteristic of crops. This study addresses that gap through a multitemporal analysis of the Normalized Difference Vegetation Index (NDVI) derived from a time series of 119 PlanetScope satellite images at 3 m s...

This study assesses surface deformation in the Vyshegrad Fortress area using Synthetic Aperture Radar (SAR) data. The site, located near the Studen Kladenets dam, is affected by complex geomorphological and environmental conditions that may compromise structural stability. Steep slopes prone to erosion and landslides, increased moisture, rock fracturing, and regional seismic activity pose significant risks to the integrity of the stone architectural complex. Their evaluation is essential for effective preservation...

This paper presents an extended multi-sensor geoinformation framework for monitoring forest ecosystems in Ukraine under conditions restricted field access. Building upon previously validated hexagonal GIS and NDVI-based remote sensing methodology applied to Zhytomyr Oblast (2021–2024), the current study incorporates an expanded Sentinel-2 time series through 2025 and introduces a theoretical framework for integrating Sentinel-1 Synthetic Aperture Radar (SAR) data to overcome the critical limitation of optical cl...

This study presents the application of integrated UAS and terrestrial close-range photogrammetry for the comprehensive 3D reconstruction of the cultural heritage site “St. John Letni” chapel, located near Pchelina Reservoir, Bulgaria. The main objective of the research is to produce detailed and accurate documentation of the chapel in its current condition, supporting its long-term preservation and potential restoration. The data acquisition combines aerial imagery from an unmanned aerial system (UAS) and terr...

This research addresses the design, integration, and validation of a complex methodology for wetland monitoring, using as case studies two peat bogs located in the Maramures Mountains Natural Park, Romania. The study is part of a larger research effort concerning the assessment of the current ecological status of internationally important wetlands in the trans-Carpathian region of Romania, Ukraine, and Slovakia, through the development of an integrated monitoring system based on advanced geomatic technologies. Thi...

Financial markets exhibit complex dynamic behavior, particularly during periods of instability when traditional assumptions about market efficiency tend to break down. This study builds upon an ML-based AI system developed in [1], [2], which extracts information from companies’ financial statements to model stock price directional movements. From a behavioral finance perspective, investor biases may lead to deviations from rational decision-making, especially during periods of market stress. To address this, a m...

Fertilizers are a fundamental agricultural input, necessary to maintain high yields and exploit soils and growing substrates that are otherwise unsuitable for plant breeding. Nevertheless, their overuse and mismanagement have led to significant negative environmental impacts, such as water pollution, high greenhouse gas emissions and soil degradation. Since the early 2000s, nanofertilizers have been touted as an innovation useful to improve both the sustainability and effectiveness of fertilization methods. The st...

Soil resilience is known as the ability to resist and recover from exposure to contaminants, climate change, erosion, anthropogenic activities and intensive use of resources, in order to maintain vital processes such as nutrient cycling, water retention, and structural stability. To remediate the affected soils, several integrated strategies, including bioremediation, hydrological management and the use of amendments can be applied. The usage of natural amendments represents a sustainable path for improving soil p...

Nature-Based Solutions (NBS) have emerged as a strategic approach in contemporary urban planning for addressing the interconnected challenges of climate change, biodiversity loss, environmental degradation, and urban resilience. By integrating natural processes and ecosystem services into the design and management of cities, NBS offer sustainable alternatives to conventional gray infrastructure while simultaneously generating environmental, social, and economic benefits. Green roofs, urban forests, wetlands, perme...

Tunnels, as specific types of transport structures, place high demands on pavement construction. When selecting the pavement type, two main construction types are often compared: asphalt concrete and cement concrete. Both have their advantages and disadvantages, which must always be considered in light of the boundary conditions. The choice between asphalt and concrete pavement should be based on the specific project requirements, climatic conditions, traffic load, planned service life, maintenance and repair opti...

In terms of sustainability of mining, one of the decisive factors, in addition to economics, is safety. This mainly includes minimizing the effects of safety risk factors such as noise, vibration and technical seismicity, dustiness, the occurrence of harmful gases, etc. From this point of view, it is necessary to pay due attention to this area in research and try to maximize the protection of workers, but also the environment, from the effects of these risk factors resulting from the mining and subsequent mineral ...

Long-term changes in fishery landings are important indicators of stock status and ecosystem condition, particularly in semi-enclosed and data-limited marine systems such as the Black Sea. These trends are also relevant to the broader international debate on sustainable fisheries management, as they can provide early warning of persistent declines where full analytical stock assessments are limited. This study assesses temporal trends in the annual landings of three Mugilidae species (Mugil cephalus, Chelon auratu...

This study presents a numerical analysis of resonator configurations for acoustic agglomeration in air purification applications. The efficiency of acoustic agglomeration is determined by the spatial distribution of acoustic pressure, which is controllably modified through mechanically deformable resonators. The investigation employs finite element analysis in a sequential multiphysics approach (ANSYS Workbench), comprising modal analysis for natural frequencies and mode shapes, harmonic acoustic analysis for defo...

Residential HVAC work (installation, commissioning, and periodic maintenance) is often performed by small teams under time pressure and in variable site conditions. Despite being routine, these tasks involve recurring occupational hazards: chemical exposure to refrigerants and oils, electrical shock during connections and testing, falls during outdoor unit mounting, manual handling injuries, and ergonomic strain from constrained postures. This paper presents a super-simple, practice-oriented method to identify, ev...

Mercury is among the most hazardous trace elements released during fuel combustion, yet its occurrence in biomass and biomass ash remains insufficiently constrained. This paper presents an integrated assessment of published data on Hg contents, associations, and probable modes of occurrence in eight biomass types and their ashes generated during combustion, with emphasis on Hg volatilization, retention in biomass ash, and comparison with industrial coals used in Bulgaria. Published chemical, mineralogical, thermal...

Selective hydrogenation of biomass-derived molecules catalyzed by metals is in high demand, but is challenging due to complex reaction pathways. Furfural (FF) is a highly effective chemical produced by processing agricultural and woodworking waste and used to produce furfuryl alcohol (FA), furan, 2-methylfuran, tetrahydrofurfuryl alcohol, etc. Furfuryl alcohol is used in the production of acid-resistant polymer concrete, fiberglass, paint and varnish materials (as a film-forming agent), as well as to create variou...

Liquefied Petroleum Gas (LPG)-assisted retrofitting of diesel engines remains attractive, but exhaustive dual-fuel bench mapping is costly and engine-specific. This paper presents a simulation-guided prioritization workflow for retrofitting the UTB 2404055 agricultural diesel engine to LPG-diesel operation. An AVL BOOST 1D model of a dual-fuel architecture with multi-point LPG port injection and direct diesel pilot injection was calibrated and validated against eight measured diesel baseline points at 1400 and 240...

This study presents the onboard integration and experimental evaluation of a small-scale wind turbine installed on a maritime vessel operating in the Danube sector. The research aims to assess the feasibility of harnessing wind energy under real navigation conditions and to quantify the electrical power generation potential across different operational states, including cruising, maneuvering, and standby. The system was designed with consideration for structural constraints, aerodynamic interference from the vesse...

The present research analyses development opportunities for car electrification in Latvia in the context of the European Green Deal, assessing both political and economic aspects as well as business practices. The research aims to identify factors that influence the development of electromobility and to develop proposals for its promotion. The research employed document analysis, statistical, qualitative and quantitative methods, as well as conducted a case study of the company Ayvens Latvija and five expert inter...