Browse

The coal samples were fractured by using high-energy solid fuel (propellants) in the lab rocket motor (LRM) adapted to investigate the impact of propellant gases pressure on rocks. The combustion of the propellant generates large quantities of gases at high pressure, which are able to produce a secondary system of fractures in the coal - potential pathways for methane migration. Values of pressure and time generated during combustion of propellants in the standard system of a laboratory rocket motor are controlled...

The article presents project implementation within Slovak Hungarian cooperation SKHU/1601/4.1/187. It includes flood modelling to predict the size and location of the flooded area. The target area is the catchment area of Hern?d/Horn?d river. Due to the cross-border nature of disasters, the objectives could be achieved more efficiently by the framework of a Hungarian-Slovakian joint cooperation. The results will ensure prompt data and information to support the decision making of disaster management authorities, a...

The integration of a building into the environment can be achieved both from the architectural point of view and from the point of view of the used building materials, thus remarking material used since ancient times, namely wood. Wood is an organic, sustainable, environmentally friendly material that can reduce carbon dioxide emissions Due to the latest environmental protection requirements, economic issues related to construction costs and architectural diversity, it has been necessary to develop technologies re...

The environmental performance of buildings needs to be considered in the early stages of the design process. Therefore, emphasis is nowadays placed in integrating the teaching of building performance with the design studios at schools of architecture. Preparing students for the complex role of an architect as a coordinator of all the aspects of a building design is gaining more and more importance.This article describes and compares the methods of teaching building performance to architecture students at several u...

Formation of gas hydrates is a problem in the petroleum industry where the gas hydrates are responsible for the blockage of flow lines, valves and well heads, thereby causing great loss of production and other severe safety hazards to the oil and gas industry. This topic is the most challenging subject in flow assurance problems in oil and gas industry. Kinetic hydrate inhibitors (KHIs) are water-soluble polymers that are used to prevent gas hydrate blockages and they have been used in the field successfully. In t...

The companies need to change in order to be competitive on the current market. There are multiple ways to change in order to face the market. One of the most efficient instruments is organization development which refers to increasing the individual, group and organization performances, to improving the organization ability to respond efficiently to outside changes. The organization development refers to increasing the internal capabilities, ensuring that the organization structures, human resource systems, posts,...

Mari El is one of the most ecologically clean areas of Russia. The local woods are famous throughout Russia and is the largest forest on the Volga river, which contain large amounts of wood and at the same time, every year increasing its use for recreation. Therefore, recreational use should pay a lot of attention. This paper examines the state of objects in the mass use of forest resources for recreational purposes on the territory of the coastal zone of suburban lakes. Conducted socio-environmental assessment at...

Banat, a historic province localized on the territory of three states (Romania, Serbia and Hungary), is constituted as a diverse spatial entity from geological and geomorphological, climatic, demographic and social-cultural perspectives, and these aspects may be observed at first eye contact, due to the biogeographic diversity. The largest part of the historical Banat is located on Romania territory, respectively 66.5% of the total area, and the Romanian Banat is the area of interest in this study. The preoccupati...

The separation between the mobile plate (Phanerozoic) in south and west of the eastern European Precambrian East European Craton is the most prominent geological limit in Europe known as the Trans-European Suture Zone (TESZ) In this study we were mainly interested in a prominent segment of TESZ, known as the Tornquist -Teisseyre Area (TTZ). In this study we highlighted the TTZ area through the gradient of geoid from Romania. The geoid provides a good representation of the long wavelength characteristics of the Ear...

This paper is about how to build a cheap modern temperature control system on an existing manufacturing system. The authors designed and implemented the control system to a tunnel type furnace for burning bricks used in constructions at SICERAM S.A. Company, Sighisoara, Romania. The bricks manufacturing phases are described in order to help the reader to understand the process complexity and the graph of the entire loading/unloading process is shown together with the tunnel furnace schematics. Then, the graphical ...

Technological and material analysis of construction works helps to achieve the intended goals set for a given undertaking taking into investment not only time and cost factors. It is worth considering the choice of a design solution in terms of material and work technology. The authors exchanged the benefits of the analysis of the technological and material performance of construction works for both the investor and the contractor. They presented the evaluation method using the selection of appropriate criteria. A...

The work described the obtaining and studying the properties of alginate-PLGA matrixes containing agglomerates of hydroxyapatite nanoparticles. Hydroxyapatite (HAP) nanoparticles were obtained by controlled deposition in the presence of a stabilizer - sodium citrate. Two types of nanoparticle lamellar (30 to 50 nm in size) and rod-shaped (150 to 200 nm in length) were used in the work. The size and morphology of the hydroxyapatite nanoparticles were studied using a transmission electron microscope. The composition...

The evaluation of the agro-ecological potential of Racha-Lechkhumi - Kvemo Svaneti region will allow using the weather and climatic conditions efficiently making it possible to grow and develop the crops efficiently and gain rich harvest. Consequently, the data of long-term (60-year-long) meteorological observations were treated and analyzed and used as the basis to calculate and evaluate the principal agro-climatic indices (sums of active temperatures (>10?C), atmospheric precipitations (mm), relative air humidit...

Paper focuses on methodology for preprocessing of transactional data from public transport system the in region as administration unit of the Czech Republic. The aim is to present synthetic information in GIS information system. Necessary data sources are defined and evaluated. Target group of users are those who plan development of public transport system. Information covering state of each bus or other mean of transport (number of passengers categorized by tariffs between any stops of the bus line) and activitie...

Uranium-238 is a parent radionuclide for several radioactive stable chemical elements, which presence in the therapeutic mud can cause negative consequences for patients. This paper presents the results of the study of the U-238 specific activity in the mud sediment cores of Pelenkino Lake and Bolshoi Tambukan Lake situated in two different geological and hydrological regions in the south of European Russia. The relationship between the U-238 specific activity in the mud, its pH, Eh values and the organic matter c...

Maize is a major energy crop for the production of silage, processing in a biogas plant, or livestock feed. However, its cultivation is associated with the possibility of soil erosion and other soil degradation processes. This paper deals with the comparison of the development of the root system of maize and selected leguminoses ? Broad bean (Vicia faba L.), Common vetch (Vicia sativa L.), White lupin (Lupinus albus) which can be grown in mixed culture system (MC). Four variants of the experiment were prepared in ...

The paper suggests a mathematical model, which is to evaluate interaction of a wheeled mover and forest soil. The model is composed by compiling results, which were obtained by independent researchers in the framework of vehicle locomotion theory under off-road conditions and authors` obtained dependencies. In particular, the model includes refined formula for calculating shape of contact area with the ground (formula allows to take into account the deformation modulus effect on contact area shape), for calculatin...

The article describes the concept connected vehicle remote diagnostic system intended to increase the useful life of the vehicle and provide a simple interaction with the service center. In article the substantiation of mathematical model of communications in system of diagnostics of an electric equipment of cars in a kind, suitable for mathematical processing is resulted. It is offered to use model at which all making systems are represented in the form of structure of final automatic machines. By means of large-...

The flood time of Siberian Rivers coincides with the spring and summer period and is characterised by intensive water feeding because of intensive snow melting. At all that, the most annual water discharge is formed, the latter, by turn, causes erosion processes. In addition, in years with excessive amount of flood water, the inhabitants suffer economic losses very much: E.g., economic activity areas are flooded, engineering structures are washed away and damaged. A number of factors form high water level such as ...

Waste from poultry farms represents the greatest danger to people and the environment among all types of bio waste. Approximate estimates show that in Russia up to 15 million tons of manure and a mixture of litter with sawdust or straw are formed annually. The original litter is a toxic substance; the main bacteria in the litter are E. coli and Salmonella. The process of torrefaction of a mixture of manure and sawdust was studied. The torrefaction proceeds in a reactor consisting of three sections with horizontal ...

First indication of habitation on the site of the future Halmyris fortress dates back to early 6th century BC, when the region was inhabited by the Getae. The Roman fortress, constructed in 2nd century AD, was the easternmost one in the chain of fortifications built under Roman occupation along the Danubian border of the empire and was abandoned in 7th century AD after it lost its economic and strategic importance. The site is located on Murighiol-Dunav?? promontory 2.5 km east of Murighiol village at around 1.5 k...

This paper presents an analysis of air pollution in Galati, in terms of NO2 concentrations, using the results of concentration measurements from two types of stations of the national air pollution monitoring network, one urban-traffic and one urban-background. In order to determine the temporal evolution of pollution, the daily average hourly NO2 measurements for 2017, obtained from urban traffic and background monitoring stations, were analyzed. Hourly concentrations of NO2 in Galati (Romania) ranged from 2.38 ?g...

The structure and the properties of the oxide nano-composition coatings formed on titanium in the diphosphate based electrolytes by means of plasma electrolytic oxidation in the spark-discharge regime at application of interelectrode voltage 100 to 130 V have been studied. The possibility to obtain the oxide layers containing the alloying elements by the modification of the composition of electrolytes has been stated. The chemical and phase composition as well as the topography, the microstructure and the grain si...

A complex geological structure with the superimposed effects of over 200 years of coal mining activities is characteristic of the Upper Silesian Coal Basin, Poland. Intensive exploitation leads to deformations of the rock mass and ground surface as well. The deformation process developing in the rock mass causes an increase in strains that may result in rockbursts. In this paper the data obtained by the PSInSAR technique covering the northeastern part of the Upper Silesian Coal Basin were used. The aim of this pap...

The Ogosta Valley downstream the town of Chiprovtsi, NW Bulgaria, was subject to long-lasting contamination with arsenic and other toxic elements due to mining and ore-processing activities in the second half of the last century. Although the exploitation of lead-silver and iron ores was ceased in the end of the 90`s, the soil in particular sections of the Ogosta?s river floodplain remained highly contaminated with arsenic, lead and other heavy metals. Arsenic mobilization and transport in the vadose zone is highl...

The article covers the theory of gravity separation suspension flows. The indicated factors affect the separation processes. The proposed criterion estimates the possibilities of dividing the hydraulic separation coefficient, which is alternative the equal fall coefficient, but taking into account the influence of the particle shape. The calculations results are shown which are indicated greater the flattened particles separation in the gravitational-centrifugal devices. The greatest interest is comparing of recov...

Daylight controls our natural biorhythm, influences our mood, has an important effect on how we feel and has an essential role in creating a healthy workplace. In most cases, daylight is not enough for reach the levels of illumination appropriate to the normal operation and we use artificial light. Incorrect lighting affects people's comfort, can lead to physical fatigue (especially eye fatigue) and reduced intellectual performance, especially when high concentration is needed. The implementation of lighting syste...

The objective of this article is to determine the need for joint security education of rescue components of the Slovak Integrated Rescue System. The reason for that is the absence of the joint education of these units which represents a critical point of their cooperation. In the introductory part we focused on the IRS?s characteristics as well as description of the security education. An important part of this article is an analysis of the management process, coordination and cooperation of the rescue components,...

The accuracy of location of seismic sources using time reversal imaging techniques is considered in this article. The location procedure is performed using backpropagation of the recorded and reversed seismic signal from receiver throughout assumed geological model. The new imaging parameters, peak average power ratio (PAPR) coefficient is used for efficient visualization of the backpropagation of the seismic energy. The detection of seismic wave focusing was carried out on the basis of the high PAPR parameter val...

The decisive factor in the process of under pressure networks inspection is determined by the correct choice of the control method in order to observe with great attention the possible faults caused by the physical wear and tear resulting from the long use. Emphasis is placed on safety conditions of under pressure equipment, which include mandatory minimum technical requirements for periodic checking of under pressure networks for pressurized, liquefied or dissolved gas. Defectoscopy is a set of procedures used to...

This paper focuses on a study regarding the use of waste in constructions: such as blast furnace slag from ironworks, as a by-product of the iron oxide reduction reactions by carbon monoxide resulting from coke burning. The slag is used in cement-based mortar mixtures under two forms: as granulated and ground slag powder under 63 ?m and non-granulated slag as an 0/4 mm aggregate resulting from solid slag, processed in crushing equipment and then sorted according to the standards on mortar and concrete aggregates. ...

In this paper, a computational method to predict the corrosion resistance of some ironbased powder metallurgy (P/M) materials is proposed. The samples prepared from atomized iron powder and pre-alloyed iron base powders powders were the materials analyzed in this paper. The compacted samples were obtained by powder metallurgy process, respectively pressing and sintering of the mixed powders. The samples were compacted at a pressures of 400 and 600 MPa. The sintering temperature was approximately 1.150 °C. The infl...

In this research we investigate the significance of the CGAL library which is a source of algorithms related to computational geometry. We briefly describe the exact computation paradigm that provides obtaining reliable geometrical results. We present the advantages of using the CGAL library in terms of investigating certain parameters of geological planar structures. We show that several parameters that can be computed and attributed to considered planes and subsequent use of further statistical methods becomes p...

In the last decade we have noticed how European Funds have expanded and today, half of EU funding is channelled through the 5 European Structural and Investment Funds (ESIF). Those are mainly focused on research and innovation, digital Technologies, supporting the low-carbon economy, sustainable management of natural resources and small businesses. They are jointly managed by the European Commission and the EU countries. The purpose of all these funds is to invest in job creation and a sustainable and healthy Euro...

Plasters belong to the most common external surface layers of building envelopes in Central Europe, which is supposedly due to their low cost and technological simplicity. Their continuous exposure to external environment can though lead to the cumulation of damage and subsequently to the necessity to repair or replace them after certain time. In this paper, the effects of environmental conditions of the city of Prague on three different plasters on lime-cement basis, commonly used either in contemporary buildings...

Implementation of the development program for the Northern and Arctic territories is not possible without the use of modern materials and technologies in the construction industry. One of the most common and popular building materials is the fine grained concrete, for the production of which, use chemical additives, mainly imported, improving the performance characteristics of the composite. Therefore, the actual problem is the replacement of imported components with Russian-made additives. As such an additive, te...

In the near future, all new buildings across European Union will have to meet the nearly Zero Energy Buildings requirements, namely to have a lower primary energy consumption and lower carbon dioxide emissions. In this regard, each country set its own targets concerning the reduction of these values. The paper presents a computational study regarding the thermal performances of an apartment, insulated in the first case scenario with a common solution such as expanded polystyrene and for the second and third case s...

The Don River Delta represent a single hydrographic system, the development of which is characterized by the spatial-temporal variability. The functional role of the individual delta channels and their participation in the distribution of the river flow are different due to significantly different morphological characteristics and stages of development. In turn, this is reflected in the peculiarities of hydrological and hydrochemical processes. In this regard, within the delta the intensity of migration of chemica...

The paper presents the impact of variable environment acidity and low temperature on the stability of biosensor receptor layer component BSA (Bovine Serum Albumin). With the use of UV/Vis spectrophotometer, absorption spectra in range (250-300nm) was taken to study conformational changes of the protein with time after exposition to different factors. The results showed an increase in absorption, associated with the conformational changes of BSA with time. A significant decrease in the absorption intensity was note...

Ecological state of the Lower Section of the Dnieper River was estimated by method of calculation of integrated index on the basis of monitoring over the years 2013?2016. Self-purification potential and capability of restoration in time and space (along the river stream) of the aquatic ecosystem of the lower section of the Dnieper River was established. The method for assessing the quality of surface water by hydrochemical parameters in accordance with the fishery standards as the most sensitive to changes of the ...

The objective of the paper is to emphasize the influence of the reclamation works of sloping land with medium-gradient hills on the field capacity and water distribution on the soil profiles located on the upper, medium and bottom ameliorated slope. The study of retaining water capacity of soils was carried out on a slope with eastern north-eastern exposure of the Ezareni farm. Soil samples were taken in spring of 2017 and 2018, immediately after the snow was melted, from 10 to 10 cm on 100 cm depth. Soil samples ...

For the analysis of polyoxometalate functionality (POM), a bioassay was developed in order to determine the effect of the functionalized porous ceramic granule (with POM) on the germination of tomato plantlets (Lycopersicon esculentum) and cowpea (Vigna unguiculata). After 3 days of incubation under dark conditions at room temperature in the case of cowpea seeds and 6 days in the case of tomato seeds, the germination process was calculated and the radicle and hypocotyl growths of the obtained plantlets were biomet...

The advancement of tracking technologies such as RFID (Radio Frequency Identification) in recent years is developing the study area of shopping behavior of consumers in retailing setting which globally regained increased interest. However, not so many studies have attempted to analyze consumer shopping behavior using the RFID data. The purpose of this paper is to propose the framework based on behavioral variables, which can be tested using the RFID data obtained from the experiment in one of the supermarkets in J...

Fennel (Foeniculum) is a member of the Apiaceae family, the most cultivated fennel cultivars belong to subspecies vulgare. This paper aim is to obtain essential oil from Foeniculum vulgare (FEO) seeds cultivated in the western part of Romania and to characterize the FEO in terms of chemical composition, herbicidal and antibacterial properties. Fennel essential oil was obtained by water vapour entrainment and the chemical composition of the oil was determined by GS-MS.The herbicidal effect was studied against weed ...

The objects of research were carbonate-siliceous rocks of Semiluk and Mendym horizons of Upper Devonian formations from Volga-Ural region, Russian Federation. The main purpose of studying was a comprehensive investigations Devonian black shale and an assessment of their resource potential as objects of future exploitation for oil (unconventional shale oil formations). It was shown that the Upper Devonian black shales and their analogues have widespread on the territory of the eastern part of the Russian platform. ...

Forecasting a demand for hard coal is no easy feat, especially at times when there are constant transformations of the country?s energy mix structure. This stage should be realized in every mining company as grave mistakes in estimating a prospective sale may result in a disadvantageous economic situation of a company. The article presents an autoregressive model which mining companies may use to analyse the predicted sale of a raw material in order to plan an action strategy based on the achieved results.

The temperature at the Earth?s surface can be estimated by ground-based methods or satellite remote sensing data. Satellite remote sensing is the only means of obtaining longterm homogeneous series of land surface temperature data. The network of ground-based observations usually is quite rare, so it is important to obtain information by remote methods. From the values of the thermal infrared spectral bands, it is possible to determine the radio brightness temperature of the underlying surface. The compilation of ...

In the combustion processes the nature and concentration of the developed gaseous effluents depends on the type of materials that are subject to combustion as well as on the conditions in which the oxidation processes take place. The purpose of this paper is the experimental determination of the combustion parameters and the study of the developed gaseous effluents from several combustible materials. The production of gaseous products resulting from combustion results in different yields depending on several param...

There a few important factors, that nowadays, unmanned aerial vehicles (UAV) are used by wider community, and for cases and applications, that cannot be performed never before. Small UAVs, as a photogrammetry measurement tool provide flexibility, reliability, are safe and easy to use, can be deployed in minutes, initial measurement can be delivered yet on the field, and final accurate measurements are calculated in a very short time, even using online services. A numerous cases was studied on Department of Geodesy...

The research carried out in the present paper aimed at monitoring and evaluating the technological process of obtaining the ecological cheese type ?PETROVA?, in the Maramures county area, Romania. To achieve this raw milk originating from domestic producers was evaluated in terms of fat content, acidity and density of this. After the final ecological cheese type product has been obtained, analyzes have been made for it?s physicochemical evaluation as follows: water content analysis, fat content analysis, salt cont...