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We analyze a series of data in the ultra-low frequency (ULF) range of geomagnetic variations, which are collected from search coil instrument and acquisition system at Panagyuriste, Geomagnetic Observatory (PAG), Bulgaria, a part of South European Geomagnetic Array (SEGMA, http://sole-terra.aquila.infn.it/it/), and data for seismic noise collected at three Bulgarian seismic stations (VTS, RZN and KDZ part of National Operative Telemetric System for Seismological Information) and three Turkish seismic stations (GOM...

The methodology of sustainable forecasting of runoff and diagnosing bifurcations of its formation, being considered in the article, allows solving fundamentally new hydrological problems (including problems of engineering hydrology) related to the possibility of obtaining long-term estimates of the probabilistic characteristics of long-term river runoff under the conditions of evolutionary changes in the runoff formation factors (climate and anthropogenic activity on catchments). Currently, these long-term estimat...

The Bistrita River was the first river harnessed for hydropower purposes in Romania, starting with 1960. Currently, on this river, 29 hydropower plants with different capacities are functioning, producing about 10% of the entire Romanian electric energy from hydro. Many of them were realized in series, in cascade. In the present paper, the area of Pangarati, Vaduri, Batca Doamnei, and Reconstructia hydropower lakes was analyzed. Of these, three are Nature Reservations, Nature 2000, RAMSAR sites. The lakes being re...

Indoor air pollution monitoring is an important activity toward a more clean air for indoor environments as most of people spend a lot more time in such environments (as e.g. at home, at their workplace or at kindergarten/school/university). The quality of indoor air can have a strong impact on human health, due to longer exposure, especially when ventilation is poor. So far, some solutions were proposed for solving this problem, starting from simple stationary sensors, to more complicated mobile sensing networks ...

Recycling of asphalt is an important technological process applied worldwide. The strategy is to use as much milled, ripped or broke asphalt material into the new mixture. With the correct technological design, the maximum appreciation of this material is achieved. Due to the dominant use of asphalt mixtures in pavements, it is important to address the possibilities of their recycling. At present, a sufficient amount of reclaimed asphalt with good potential for further use is available in Slovakia. The problem is ...

In the present work the researches were carried out in the Tata Valley watershed, which has an area of 17 km2 and administratively belongs to Dambovita county, Romania. The purpose of the study was to estimate the soil losses for a single storm event in the Tata Valley watershed using the MUSLE method and G.I.S. The identification of the erosion processes and the estimation of the quantity of eroded material is extremely important both for the elaboration of the risk maps, as well as for the analysis of the surfac...

Biomass is the world's fourth largest source of energy after oil, coal and natural gas. Biomass is the largest and currently the most important renewable energy option and can be used to produce various forms of energy. As a result, biomass, together with other renewable energy options, is able to provide all the energy services needed in today's society, both locally and globally. Among many other aspects, the renew-ability and versatility of biomass as an energy source is also an important advantage. In addition...

This research describes such a problem as increasing the productivity of wells and the oil recovery coefficient by conducting various geological and technical measures, which based on correlation, regression, and statistical analyzes. These methods allow to analyse a possible interconnection of two or more numbers of indicators, also identifying the problematic well stock, and selecting a set of measures aimed at improving the efficiency of field development, including various geological and technical measures. Ex...

The present work dwells on testing methodical approaches to optimization of programs for monitoring over ambient air quality. The key issue here was to determine how many control points are required and make up a list of substances for monitoring in a large industrial center with its area exceeding 350 square kilometers and population more than 1 million people. Ambient air quality in the examined city is influenced by more than 150 industrial enterprises operating in metallurgy, civil engineering, chemical indust...

Under the effect of strong heat, chemical fertilizers tend to decompose. These decompositions can be followed by burns or explosions. The tendency to suffer self-sustaining decomposition is determined by the test method described in Test S.1 of the United Nation Manual of Tests and Criteria for the classification of ammonium nitrate fertilizers. The purpose of this work is to present the tests, experiments and interpretation of the experimental data necessary for the classification of chemical fertilizers based on...

In the national policy and development documents of Latvia, forest, along with other natural resources, is defined as an important strategic resource for the sustainable overall development of the country and the development of a diverse and export-intensive economy. At the same time, the need to exploit forests sustainably, reducing the risks to the quality of the natural environment posed by human activities, is emphasized by the documents. The research question is as follows: Are forests in Latvia overexploited...

The hydraulic systems used in the aviation industry use pressurized fluids that transmit energy to various driving systems of the aircraft (hydraulic motors, cylinders or hydraulic actuators). It is known that hydraulic fluids, along with the fuels used, present a potential risk of fire, which can lead to damages or the loss of the aircraft, often with very serious consequences. At the same time, in the event of a plane fire after the crash, hydraulic fluids can be an additional fuel source. For these reasons, the...

The Southern Dobrogea is situated in SE Romania, being included, tectonic point of view, in the Moesian Platform. The Southern Romania is bordered by the Danube to the West and the Black Sea to the East. In the N, the Southern Dobrogea is bordered by the Capidava-Ovidiu subcrustal fault; towards south, it continues to the northern Bulgaria. In the Southern Dobrogea, a carbonate platform developed from Mesozoic (Upper Jurassic and Cretaceous), and continued through the Paleogene up to the Miocene. The Pliocene is m...

The level of geological competence of students studying in the areas of undergraduate studies ?Earth Sciences? and ?Pedagogical Education? (profiles Geography, Geography and Biology), determine not only the acquired theoretical knowledge and competencies, but also the ability to record and summarize field observations. The latter is formed in the process of a person's knowledge of the natural environment according to the didactic principle?- from the known to the unknown, from close to far. In Russia, it received ...

Radon (222Rn) is a natural gas produced by the radioactive decay of uranium-bearing rocks and soils in the Earth?s crust. Geology is one of the main factors controlling source and distribution of radon. Most rocks and soils possess small amount of uranium, but there are particular types of bedrocks and unconsolidated deposits characterized by higher than average uranium contents. These lithological types include some granites, light-colored volcanic rocks, phosphatic rocks, ironstones, limestones and shales rich i...

Ground-Penetrating Radar (GPR) surveys can enhance the quantity and quality of information, when applied to archaeological prospection. The potential of the GPR method lies in its relevance to a wide range of site conditions and the complementary nature of the data in comparison with other geophysical methods. The Aegyssus archaeological site is located on the Monument Hill, in the north-eastern section of Tulcea, and was built at the end of the 4th century B.C. Its name, of celtic origin, derived from the legenda...

Background: the exposure to high levels of vibrations could induce health problems resulting in the damage of joints, muscles, other than pathologies connected to the circulation and the sensory nerves. These phenomena are often related to the use of machines that require high efforts, repetitive movements, or not ergonomic postures. Methods: 13 Radial Arm Polisher Machines (RAPM) of different manufacturers and different ages were investigated in order to analyze the vibrations produced during a whole process of m...

Occupational diseases linked to noise risk are still one of the most important employment problems, particularly in the quarry activities. Many negative effects on human health can arise after long exposure to noise in an occupational context. To protect workers' health and prevent hearing problems, employers must provide to workers with hearing protection equipment. In recent years, however, there have been many problems with the use of hearing protection devices. These have a highly mitigating effect but can iso...

The paper presents a study of hydraulic modeling of the drinking water and sewage distribution network in Beclean City, Bistrita Nasaud County, from Romania. This study includes a calibrated simulation of the flow through networks (systems), which allows the elaboration of a future strategy of developing the networks (systems) of water and sewage. The need to develop hydraulic models as accurately as possible results from the fact that, by creating and calibrating the hydraulic model of a system, a variety of syst...

Currently every day the need for obtaining information from satellites and quadcopters is increasing. Various services and ordinary users have a need for automated processing of received information from satellites. However, automated processing raises a number of problems: different illumination of objects, their difference in different times for example at different times of the year, soil changes, river spills and forests before and after fires etc. However, topology allows you to preserve the shape of feature ...

The operation is based on the identification of the working area on the old land book plan. This includes the topographic numbers of the area where the building is located and all representative details, namely water courses, roads, road intersections as well as other linear elements well established in time. On the old land book plans, each plot is highlighted with a distinct topographic number, topographic number that is entered in the land register and corresponds with a land book. The old land book plan was dr...

Research conducted in INCD URBAN-INCERC, within the National Network for Seismic Monitoring and Protection of Constructed Heritage, converges towards the development of a large monitoring system, capable to allow remote identification, in a very short time after a seismic event, of possible dangerous changes in the condition of the instrumented buildings. In order to obtain correct information regarding the behavior of a structural system (due to the lack of data needed to create a reliable model), the advantages ...

Nowadays, in the Arkhangelsk region of the Russian Federation, the timber industry is under active development. A quantity of raw materials necessary for the increasing production capacities of timber processing enterprises show an annual increase. Roundwood removes from forest to limber mill by highway, train, water transport, barges and float boat (which, by the way, is one of the main types of transport). The timber processing enterprises on the river channel are equipped with pile piers which help floating tim...

The article attempts to explain different impacts of border effect on different types of borders and the question of whether the border effect has a greater intensity at the national border than at the border between the regions of one country and how big this difference is. The hypothesis was tested on a case study of the Liberec region, located in the Czech Republic at the border with Poland and Germany (part of Euroregion Nisa ? Neisse ? Nysa). For quantifying the border effect, the gravity model of spatial int...

The article considers the solving the problem arising at the mathematical modeling of hydrological processes, namely, the problem of the number of phase variables taken into account in the model. The number of variables in the model can change depending on the climate. The fractal dimension characterizes required number of variables. In the article the results of applying the established regularity of the influence of the long-term norm of surface air temperature on the fractal dimensionality of the annual runoff ...

In the mountain zone, the slope exposure plays important role in the process of soil formation. The aim of the work was to assess the impact of slope exposure on the soil properties of agricultural terraces in the Eastern Caucasus. A study of soil properties of agricultural terraces in the mountainous zone of the Eastern Caucasus (Dagestan, Russian Federation) was carried out. The purpose of the study was to compare the soils of agricultural terraces on the slopes of the northern and southern exposure. The content...

The present study has been dedicated on the removal process of heavy metal ions from electrolyte solutions by using methods of electroflotation and subsequent filtration in a multi-component system with the presence of various surfactants of different nature. The research was conducted in a five-component system comprising ions of iron (II), nickel (II), copper (II), plumbum (II), and zinc (II) (the total concentration of metal ions is 200 mg/l). The research was conducted in a highly concentrated electrolyte solu...

In the last decades in Romanian forests, a massive phenomenon of uncontrolled cut trees was observed, leading to a new environmental problem. In these conditions, the solar radiation affects the seedlings of some tree species as the beech and oak, and generally the entire life from these forests. In the last 5-6 years, a supplementary massive invasion of the white mistletoe was observed, especially associated with the silver fir and beech. The main objective of this paper is to associate the effects of the solar r...

The purpose of this report is to show possible ways to improve the information access for societies in developing countries possessing significant mineral reserves and mining industries, which considerably affect the welfare of national economies and population. The research methodology is based on the provisions of official regulatory documents, methods for processing and analyzing statistical data related to the subject of the research, demonstration of the results characterizing the state and dynamics of the in...

The identification technique of hazardous clouds using infrared spectrometry is based on the spectral analysis of electromagnetic radiation that is absorbed and emitted by the molecules of a gas cloud. Molecules can be identified by analyzing the location of lines inside the spectrum, representing the energy differences between the cases involved and the strength of the lines, which is the probability of a photon being absorbed or emitted. This method is often called passive infrared spectrometry because no artifi...

The paper presents the examples of georadar sounding of rocks and soils of mining constructions and facilities in order to control their internal structures and conditions. The measurements have revealed that in the inner zones of inhomogeneities the induced electromagnetic field is distorted due to the difference in the physical properties of the zone? rocks and the main rock mass. The authors have established that the intensity of the wave field distortion is determined by the contrast of the physical properties...

In the current context, in which the analysis of the failures by infrared thermography for the hydraulically operated machines is an increasingly widespread internationally method, starting from the year 2016, in Romania, at INOE 2000 - IHP Bucharest the first thermographic analyzes were laid made on hydraulic equipment. It is known that by maintaining normal limits of variation of the temperature and viscosity of the hydraulic oil in the actuation plants, are created the conditions of the productivity increase an...

The purpose of this study was to separate and subsequently investigate the lake governance developments within existing surface water resource governance system in Latvia by looking across all the three country administration levels, namely of the national, regional and municipal levels, in order to determine the actual state and main drawbacks of this step-wise developing lake governance system in Latvian. In this study, lake governance was systemized and characterized, taking note of what particular and eventual...

The research papers for the present study were carried out in the 2018-2019 period in the river basin of the Muscel stream, a tributary of the Dambovita river, in Romania, using the empirical method of weighted overlay of thematic maps and GIS, resulting the hazard maps considering landslides which occurred on the scale of the studied drainage area. For the application of the research method, the necessary data regarding the digital terrain model, the land cover with vegetation and the degree of urbanization, were...

Fires in natural ecosystems, including forest fires, destroy whole ecosystems of states and can be extremely catastrophic. Total square of forest fund in Ukraine is 10.4 million ha, 9.6 million ha of which is covered with forests vegetation. Forest cover of the state is 15.9%. For the last 50 years, the square of the forests increased at 21% and wood stock ? almost three times. Suppression of fires in natural ecosystems and forests would be impossible without transportation means. That is why, during emergency man...

The article shows the stages of creating an interactive map of tourist resources of the Akmola region by using Web-technology. The main tourist resources of the region and methods for their assessment were determined. The tourist resources of the region are represented by natural (geological and geomorphological, climatic, hydrological, botanical), cultural and historical, also socio-economic resources. Evaluation of geological resources was carried out by using the cartographic method (the cartograms mode). To as...

Through this work we have created two geodesic support networks of the V order in the peat area of Poiana Stampei commune, supporting the subsequent topographic elevations of both the railway and its auxiliary elements, as well as the adjacent areas, be they forest boundaries, fences, etc. .a .. After materializing and making observations, it is necessary to compensate the networks to obtain the final coordinates of the points that will serve the subsequent topographic surveys and the topographic plans. In order t...

Alzheimer?s disease, the most common age-related dementia worldwide, is characterized by two pathologies: deposition of ?-amyloid plaque and neurofibrillary tangles of hyperphosphorylated tau. To this date, several factors, such as oxidative stress, metal ions, or genetic factors are associated with Alzheimer`s diseases, but there are still some question marks regarding: (i) how the misfolding and aggregation of A? occurs and which is the aggregation mechanism; (ii) how the metal ions binds to A? and how they init...

The purpose of this paper is to determine the rate of methane (explosive gas ) and of carbon dioxide (axphysants gas ) in the mine workings of Praid salt mine. Currently in Romania there are six salt mines which exploit the salt through underground mine workings: Praid salt mine, Tg. Ocna salt mine, Slanic Prahova salt mine, Ocnele Mari salt mine, Cacica salt mine, and Dej salt mine. Of these six, in three salt mines occurred gas and salt eruptions: Praid salt mine, Slanic Prahova salt mine and Tg. Ocna salt mine....

Currently there are many spatial structures for storing information about raster and vector maps. There are many algorithms for calculating map information, each of which is applicable to a specific industry. Now there is a problem of the lack of a universal algorithm for obtaining information about the maps, which will allow you to store its scale, time of image creation, deformation, various rotations and other topological features of objects in the images. The article sets the task of developing a method for ex...

The article presents a novel research project aimed at analysis of historical processes at memorable places of the Tambov region associated with prominent Russian personalities using original technologies for analysis, data processing and creation of virtual reconstructions of cultural and historical heritage. It includes: development of the technology for creating 3D models of cultural heritage objects for virtual reconstruction of historically significant territories; development of the technology for analysis o...

In this study on speaking about minerals, we can use the elements from them in high-tech technology in everyday life. The pegmatites are surrounded by gneiss with muscovite, garnets, staurolite; mica schists with garnets, staurolite, kyanite; and amphibolites. In the Con?u area pegmatites appear in tabular veins form, or irregular lenses, arranged by accordance with mica schists of the host metamorphic rocks. The pegmatites veins have a thickness that varies between 2 and 10 meters in the central area and developm...

The paper presents a synthesis of our researches on the main physic - chemical and biological parameters of the Snagov Lake, from Ilfov County, Romania, made since 2013 until 2019. We have developed complex investigations on the most important water quality parameters of the lake, in the purpose of analyze the evolution of the water eutrophication phenomenon in time, in different sampling points, also to establish the optimal methods of control and combat of the studied pollution process. Because the eutrophicatio...

In more than ten years of research in the field of carbon capture and storage (CCS) in Romania, several regions have been highlighted for their potential to contribute to the implementation of the technology in the country. Their delimitation has been made around large industrial stationary sources where promising storage and utilization options were available, considering favorable transport routes and small transport distances. The most promising and most studied regions for Romania are Oltenia and Galati. Olten...

Transport is part of our lives. We live in an accelerated time and this also affects our transport demands. We need to move from one place to another faster. People often use own cars to move faster. The individual automobile transport has advantages. I tis flexible, fast and comfortable. But the automobile transport disadvantages. Many cars cause traffic jams, have a negative impact on the environment and the public roads are load. Individual car transport competes with public transport. In our country the public...

Nanoparticles, due to small size and capacity to remain in suspension, are very efficient to remediate aquifers contaminated. However, due to their small size, while nanoparticles are traveling through porous media, they can rapidly aggregate, causing their settling and deposition. These phenomena produce issues for in situ remediation, such as the loss in chemical reactivity and the unknowing about the nanoparticles distribution when they are injected in situ. Laboratory experiment has been carried out with groun...

Recently, zeolites have attracted a significant interest due to their potential use in a wide range of applications related to water treatment and environmental remediation. The chemical and thermal treatments are the most used approaches to improve the zeolites properties by enhancement of sorption properties, surface area and porosity. Chemical (2M NaCl), thermal (150 °C for 24 h) and thermo-chemical (2M NaCl, 150 °C for 24 h) activation methods for a natural clinoptilolite based zeolite originated from Romania ...

A business model consists of specific components that enable the presentation of the path and tools for creating value or its loss in the activities of enterprises. Classically, from the accounting science research point of view and in accordance with the disclosure map proposed by the International Integrated Reporting Council (IIRC), there are four main components of a business model: inputs (capitals), business activities, outputs and outcomes. The research subject presented in the paper is inputs, which includ...

To understand the natural causes of the ?global warming?, it?s necessary to know the temporal evolution of the warm and cold phases of some cosmic phenomena with a cyclical development that induced the general climate of our planet in the past. For historic times, the climatic effects of shorter cycles are manifested more than those of longer ones, which are less visible. Thus, the ?global warming? (in fact the ?Actual Climatic Optimum? - ACO) can be regarded as the last warm phase of the mini-glaciations cycle. T...

From the tourist point of view, National Park of ?Nemuna? mountins is one of the most interesting territories in Kosovo and beyond. It has the most diverse and preserved forest vegetation, with a range of endemic flora species and flora relics, which in scientific and tourist terms is very important and attractive. This of course complements the morphological and hydrographic characteristics, as well as important tourist motives. The mentioned natural resources of the ?Nemuna?mountains positively determine their r...