Browse

This article discusses the use of a 3D printer as a complex machine enabling not only 3D printing but also laser engraving and cutting. With a suitable design, the print head can be easily replaced with an engraving head [1]. With regard to the laser power, wood materials can be engraved or marked, and with the use of a chemical-based agent for engraving, we can apply it also to metals. A sufficiently powerful laser can cut even thin veneer, which can be used to create templates, stencils, models and graphical ite...

Monumental trees are very important for biodiversity, the integrity of ecosystems worldwide and in many ways for people, because they are essential components of human cultural heritage and identity. Researchers have long claimed the bio-ecological importance of ancient trees and of those with great diameters and heights together with the necessity of preserving them for scientific purposes. In order for a tree to be selected as monument, it must have historical, folkloric or mystical characteristics. Moreover, a ...

Karst poljes represent depressions created in territories made up of limestone and dolomite rocks. Generally, in Albania the karst poljes have multiple origin, thus they have a polygenetic character due to the active activity of tectonics faults, river activity and in some cases of the significant influence of glaciation during the Quaternary period. These shapes are of different sizes, the range of hundreds of meters to several kilometers, while the bottom is flat and with small topographic contrasts. Large-scale...

Thermokarst plains with fluvial erosion were studied for the prognosis of their development including natural exogenous hazards. These plains develop through two contrasting processes: 1) thermokarst lakes appearing and increasing in size, 2) drainage of the lakes through fluvial erosion and their transformation into khasireis (drained thermokarst depressions). The present research deals with four different variants of development of the thermokarst plains with fluvial erosion. The research uses mathematical model...

The process of road construction in Poland, including mainly new sections of motorways, was intensified until 2012, when preparations for the European Football Championships were underway, to which events Poland was a co-organizer. And although this process has contributed to a significant improvement of the road network - various categories (mainly motorways and expressways in the east-west direction), the satisfactory state of road density and technical condition is lacking. Technical, financial and legal aspect...

The most important conditions to place the polytunnels are the presence of heating and water sources as well as the distance to the market, in order to diminish the transport costs. In the polytunnels, it is necessary to control the air and the soil factors. In soil, the main factor is water content that ensures the water to the plants, but over a value can has a negative effect. The negative effects of moisture excess are found in all stages of growth and development of vegetable plants because it determines adve...

The new global economic situation required improved business processes, on the one hand. On the other hand, more and more attention is paid to the non-financial factors that affect the enterprises as a whole. This highlights the need to rethink the business model used at every level in financial and non-financial enterprises. There is a growing need to analyze the non-financial factors affecting the activities of the companies as a whole. These factors include: investor relations, accurate and clear presentation o...

Diversity of nature does not apply everywhere and without exception one way to protect against flooding. The prerequisite for an effective response to the flood situation is the emergence of continuous monitoring of meteorological and hydrological situation. The aim of this article is to contribute to the prevention of flood not only wrote but to take into account the impact to society. The purpose of this paper is to define the current state of notification and warning of floods in the Slovak Republic. In the pre...

The purpose of this work is to develop new solutions in seismic acquisition technique used in marine conditions to acquire seismic data for hydrocarbon search technologies at the sea bottom and in the transit zones. The ocean-bottom seismic cable system based on molecular-electronic sensors is a cable telemetry system consisting of units connected by cables that transmit the digitized signal to the receiving point on the vessel. Each unit is an assembly of a vertical molecular-electronic geophone, a molecular-elec...

The aim of the article is to explore the relationship between the economic strategy of an oil-exporting country and the organizational and economic structure of the oil sector and oil companies on the example of some countries - significant net exporters of oil, primarily Russia and Saudi Arabia, as well as the specifics of environmental protection measures within the oil industry of these countries. In recent years, coordination between these two countries has played a major role in stabilizing the oil market and...

Reverse vending machines (RVM) are a key part of used plastic containers utilization system in Europe and the United States. Waste recognition and sorting in RVM machines can be performed by any of the following procedures: by determining the container material (e.g. using the IR-spectrometer), by recognition of the container type by its shape, or by the barcode identification.[1] These three basic control-procedures make any attempt of the fraud completely impossible. But at the same time, it makes the RVM too ex...

The problem of project management in modern management is developed in detail and brought up to standards. However, in conditions of high uncertainty of the external environment, agricultural enterprises need to make optimal use of resources and improve the quality of business processes in the organization in order to adapt quickly to various changes. The paper proposes the author's concept in improving the management of business processes in agricultural enterprises. It is based on the hypothesis that the effecti...

In 1900, just at the end of the Little Ice Age, a present day fjord valley was filled with a huge glacier, Hambergbreen, which protruded into the Barents Sea. By 1936, a weakly incised bay, named Hambergbukta, appeared at the glacier?s front due its retreat. Afterwards, the glacier?s recession and frontal retreat have continued until the end of the 1950s, when a fjord appeared. This frontal retreat was reversed by the glacier?s surge which filled up the fjord valley with the fissured glacier?s tongue just after 19...

The work is devoted to the construction of the railway line as part of an integrated mining project for the successful operation of the mining and processing plant. The purpose of the work is to develop and substantiate a model of a concession agreement for the construction of railway infrastructure, which is indispensable for the successful implementation of a project for the development of the major coal deposit. Methods used in the research are strategic, institutional, investment analysis, method of modeling a...

Extracellular vesicles (EVs), as transporter of distinct bioactive molecules, can take part in different physiological mechanisms. Whereas a high number of studies have been published related to mammalian derived EVs, the existence of EVs in plants still is controversial. Plant EVs are poorly characterized, and their composition is largely unknown. Our knowledge of plant exosomes is limited, and we are far from understanding the biological functions of plant exosomes. The fusion of multivesicular bodies with a pla...

Optimum reservoir recovery and profitability results from guidance by an effective reservoir management plan. Success in developing the most appropriate reservoir management plan requires knowledge and considerations of (1) the reservoir system, including rocks, fluids, and rock-fluid interactions, as well as wellbores and associated equipment and surface facilities; (2) the technologies available to describe, analyze, and exploit the reservoir; and (3) the business environment under which the plan will be develop...

This article is dedicated to the peculiarities of geology development in higher educational establishments in Russia in 20-21 centuries exemplified by two Tomsk universities ? Tomsk State University and Tomsk Polytechnic University. The theme is discussed in regards to transformation of the finance system for geological practices during the transition from planned to a market economy. This transformation has led to a slack demand for some types of geological works, which further brings us to discrepancy between th...

Aerogels are promising materials for use in various industries such as chemical, pharmaceutical, medicine and food industry. These highly porous materials have unique properties, including high adsorption capacity, which makes it possible to successfully impregnate various substances into aerogels: active pharmaceutical ingredients (APIs with low solubility and bioavailability), various oils (for example, high volatile), additives for the food industry (vitamins and aromas) and many others. The aim of present inve...

The quality of contamination of environment by heavy metals has become global task. Heavy metals could negatively affect production and the quality of agricultural crops and through food chain could endanger the population. In our work the area Malanta situated in the south-western part of Slovakia was monitored. From 20 sampling sites the soils samples were taken and the analyses of selected heavy metals in extract NH4NO3 c = 1 mol/dm3 and aqua regia were carried out. Analytical ending was flame AAS (AAS Varian A...

Our new perspective on possible cosmic causes of the tectonic phases as well as our attempt to elaborate a cyclostratigraphic chart of the Neogene for Central Paratethys, imposed a reconsideration of the key data on the Wallachian tectonic phase. Especially since this important moment was ?abolished? by some modern authors. The Wallachian phase was defined by Hans Stille in connection with the Neogene?Quaternary limit. But this German geologist relied on the data of Romanian geologists who published, from 1907 to ...

The research is carried out to obtain the connection between the Earth magnetic field data and forest stand indices in Latvian forests. The hypothesis has been examined that magnetic field influences the growth of trees. The research object ? Ogre Region was selected according to the magnetic field deviation's map of Latvia. The data of Earth magnetic field measurements via satellite and the forest taxation indices were used ? there was designed the distribution of forest subquarters in belts of magnetic field rad...

Modeling the elastic properties of rocks may be one of the characteristics of the investigated geological section. In modeling, a connection is established between the main characteristics of the reservoir: porosity and pore shape, saturation, and mineral composition. In this article, the results of petrophysical interpretation and modeling of the elastic properties are presented on the example of sandy deposits from one of the fields in Western Siberia. At the first stage, the well with a full geophysical complex...

The article deals with the regularity connecting the correlation type of the fractal dimension of the series of river flow with the climatic norm of the surface air temperature. The identified patterns in the increased fractal dimension of long-term river flow series at extremely low (sub-Arctic climatic zone) and high (sub-equatorial zone) climatic norms of surface air temperature are linked with its significant influence on the selective value of evaporation in comparison with the river flow. A map of the locati...

The reliability of surface air temperature (SAT) and 500 hPa geopotential height (H500) of the recent 20CR project data has been evaluated on daily, seasonal and longer timescales for western and eastern parts of Eurasia. The mean daily difference (between 20CR and observations) is up to 1°C in autumn-winter season and 2°C in the spring-summer season. For stations located in Western Eurasia the difference appears to be generically similar for selected stations in Eastern Eurasia region. The regional differences ar...

The presented paper is focused on digital image processing of medial temporal lobe (MTL) brain structure displayed in B-image. The analysis of the echogenicity grade of the MTL is an important part of Alzheimer?s Disease diagnosis. The image processing is based on the computation of the ratio of black/white pixels in square-shape Region of Interest (ROI) in which the MTL is visible. This ratio could correspond with the MTL echogenicity grade. For this analysis, the core of our developed computer application create...

It is underlined that in the conditions of new opportunities to enter the European market the system of product promotion is important. It is important to get used to to market conditions, increasing the attractiveness of enterprises. It is important to admit that market system should current elements of the marketing complex. The Internet provides new modern methods and technologies of product promotion. Among its components are interactive marketing communications that are indispensable in the implementation of ...

Ozone and nitrogen dioxide (NO2) are atmospheric pollutants with known associations for adverse effects on human health. In the stratosphere, ozone molecules play an important role by absorbing ultraviolet radiation from the Sun and protecting the Earth from dangerous rays. But in the troposphere, close to ground level, ozone molecules are atmospheric pollutants, threatening human health and becoming greenhouse gases contributing to climate change. Unlike most air pollutants, tropospheric ozone is not emitted dire...

Potentially toxic elements such as arsenic and antimony represent dangerous contaminants for the ground and surface water around abandoned Sb deposits in Slovakia. Therefore, we are working on a complex study on the material from tailings, including mineralogy, water quality and microbial inhabitants of the contaminated waters. The aim of the work presented here, was to observe the chemical composition of iron ochres and the role of the microbial diversity in the mobilization or immobilization of As and Sb from a ...

Digitalization in business environment and management processes at the same time entails the need for additional skills to prepare clients and members of society by explaining to them the nature and use of products. Therefore, senior and middle managers have to be not only knowledgeable in their profession and develop the relevant hard skills but also, due to the labour market demand, have to be aware of importance of soft skills? training and understanding. In the process of developing study courses in life scien...

This article is dedicated to the problem of interaction between regional geological practices and geological education in the classical university exemplified by Siberian educational entities. Turning to real geological works in classical universities can reveal new aspects of geological knowledge for historians and methodologists of geology. It is important to emphasize that regional works are fundamental for all types of geological practices. It was proved that decline in funding for regional geological works th...

Collecting the development of historical theories, it must be concluded that first studies in the field of urban?rural interaction were analysed within the model of centre? periphery while the interaction of both 21st century theories are valued as an important part of polycentric spatial development. Although for the last 15 years scientists have actively focused on studies about urban?rural interaction and partnership, mainly just separate aspects have been studied, for instance, employment, migration, flow of g...

The early part of the last glacial period (referred to as Wurmian in the European Alps) was characterized by two long and relatively warm interstadials which can be traced and correlated across large parts of Europe. Detailed information about environmental changes and erosional/depositional processes during the Early to Middle Wurmian is available from sedimentary records preserved in glacially carved valleys and basins of the Alps and their forelands. Especially lacustrine sections best preserving palaeoenvironm...

The main goal of young forest tending is to create suitable forest stands with desired structure of tree species and certain number of trees for ensuring of sufficient growth space. Tending needs to be done both in naturally and artificially regenerated young forest stands by creating composition of forest stand and releasing space for growth of most perspective trees, which is done by removing trees of poor quality and one lagged behind in growth. Thus tending has a great impact on creating productive forest of h...

Research is deservingly considered the one of the engines driving economy. Even in times of crisis, the economic entities that have focused on this activity have reaped its benefits, especially after the crisis had passed. Research and development is not just about finding new products, materials, etc., adopting or diversifying services, but it has taken into account the most important factor for the achievement of this activity: the human component. Without the involvement of humans in this activity, especially r...

The function of the soil is decomposition of organic matter, circulation of nutrients, retain and release of water and regulation of biological processes in the soil. Compacted soil and lack of organic matter disturbs this system in the soil. Project approaches a possibility to support biological soil systems by means of biostimulation as well as the possibility to promote soil biological systems using biostimulation. The effect of soil biostimulants on soil properties was studied in the territory of the Czech Rep...

Steel industry has a huge impact on the environment and the air, in particular, producing thousands of tons of gases, including blast furnace gas, gases from oxygen converter processes, coke industry gases, ferroalloy industry gases. Due to this fact, the removal of gas impurities is essential nowadays. In this paper we did the literary analysis of how to remove sulfur impurities from air emissions using different types of sorbing agents. This paper contains the researches about sorption of impurities using zeolit...

The safety conditions of the underground works carried out for the coal mining process are ensured by longwall supports. The particularities of the system of hydraulic powered roof supports are given by structure of the supporting component, by the pumping station and respectively by the operating liquid and the length of the wall the activity of which needs to be ensured. The pumping stations used for the supply of the roof supports, also called hydraulic assemblies, are composed of: the oil in water tank, the pu...

We report the hydrogenation of furfural (FF) to furfuryl alcohol (FA) with Ru- and Pd-containing catalysts stabilized by hypercrosslinked polystyrene (HPS). Ru- and Pd-containing HPS-based catalysts were synthesized via wet-impregnation method. FF is one of the major ingredients of bio-oil produced by biomass pyrolysis, while FA is a source of value-added chemicals, thus, creating an effective path from biomass to important compounds. Different metal precursors were used for the synthesis of the catalyst. The natu...

With the increasing levels of pollution, it is necessary to take actions aiming at reducing emissions of harmful substances to the environment. Unfortunately, increasing demand for new goods and energy does not contribute to the decrease of concentration of harmful substances in soil, water or air. Unexpected uncontrolled releases of chemicals caused by breakdowns in production plants are also a detrimental factor. Adding exhaust and nitrogen oxide emissions from vehicles, the situation seems to be hard to contain...

The paper considers the problems of formation and handling of production and consumption waste, including solid municipal waste. The authors have shown that waste storage in the landfills will be the main method of disposal in the near future. It is necessary to carry out an integrated monitoring of environmental conditions in the area of landfills to minimize the negative impact on the environment. The article presents the general scheme of the life cycle of production and consumption waste landfills and analyses...

Stoilensky GOK is one of the leading enterprises in Russia in terms of production of raw materials for ferrous metallurgy. From the ecological point of view, ore deposits are natural sources of pollution because they contain many chemical elements. According hydrogeology, drainage, operation of the tailings dump, technical water after treatment process can be sources of pollution of the underlying aquifers. At the enterprise the operation of the seepage pit is mainly aimed at protecting from the Alb - Cenomanian a...

AkzoNobel?s (now Nouryon) reagents from the class of alkylhydroxamic acids were assessed as collectors to float the titanium-based perovskite minerals. Hydroxamic acids can form strong complex compounds of various structures with transiting metals, which leads to their widespread use not only in analytical chemistry, but also in mineral processing. In the series of reagents under study, in addition to the traditional octyl-hydroxamic acid, we considered hydroxamic acids obtained from natural raw materials and diff...

The paper analyzes the vertical and horizontal deformations of the rockfill dam body of the pump-station hydropower plant (PHP). We are dealing in more details with geotechnical design and assessment of the reservoir lower dam. We concentrate especially to the results of mathematical modelling of the lower dam body and the asphaltic concrete sealing (both the vertical and inclined) as well as to possibilities of undemanding effect elimination. At the problem solution there was used numerical method of finite eleme...

The article examines the experience of using geographic information systems (GIS) in the preparation of specialists of geographers in higher education institutions of Ukraine. Educational and professional training programs for geographers at the Kherson State University are represented as a basic model. The main accent is put on differences of programs according to the existing three specialties, for which the training is carried out: 103 Earth Sciences, 106 Geography and 014.17 Secondary Education (Geography). Th...

It is a well-known fact that in today?s globalizing world, information, communication and IT are intrinsic to modern society. Information technologies have certainly affected the sphere of education, namely higher educational institutions. Progressive development of the Internet as a system of shared access gives new opportunities of acquiring knowledge. A specialist of the XXI century should be able to use information resources productively, as well as to think creatively and have communication skills. LMS (Learn...

There are pesticides with a scent and specific but also there are odorous phytosanitary substances, the latter being clearly more dangerous than the first because they do not warn about their presence in the air in the given case. Why do pesticides have negative effects? Pesticides are synthetic chemicals, foreign to the animal and vegetable kingdoms. They can not be biologically assimilated, so that after dispersions, they accumulate in the organs of the human body, in the soil and in the plants. In humans, pesti...

Lots of employers expect from their employees, apart from professional competences, a team work ability and ability to effectively implement team projects. However, few high schools and faculties in their curricula provide students with knowledge on teamwork, and therefore, graduates do not have appropriate competences in this area. In the course of studies, students usually learn about advanced IT tools for specialized applications, but they are rarely taught how to use groupware. As a part of the course on Infor...

In the context of the current climate change faced by mankind, a series of phenomena are emerging, which can pose problems to both several environmental aspects, including among others biodiversity and agricultural crops. Drought is a regional phenomenon which, through its impact on agriculture, can also have a bad influence on the economy. Apple farming, through its spreading area and its importance in human nutrition and health is also affected by this aspect. Based on high temperatures and a reduced amount of p...

In cement production waste of various industries (metallurgical, chemical, etc.) is widely used. This contributes to the improvement of environmental protection and intensification of the clinker firing process, as well as improving the quality of clinker by modifying clinker minerals. Due to the large variety of wastes, the decision to use them effectively in the production of Portland cement clinker should be based on the results of scientific research both in the laboratory and in the industrial environment.The...

The article dealing with optimizing of the foundation method a statically complicated bridge structure founded in difficult engineering-geological conditions. The Finite Element Method (FEM) was used to optimize the foundation method. Its mathematical apparatus makes it possible to take into account and define very complex and difficult boundary conditions of the solved engineering problem (material, geometric, static, etc.). The analysed bridge over the Danube River is located in Dunaujvaros (Hungary), which is a...