Browse

Stability analysis of underground excavations, such as tunnels, the most important parameters in the design of these structures. Because long-life underground structures should be according to their use. On the other hand, the amount and quality of tunnel excavation are depending on various parameters including geology risks and different type of rocks. So, for the optimal stability, mechanical behavior of the rock mass should be known. The current essay considers the showing stability and designed of Dezh-mandeh ...

The article deals with a numerical simulation of the forced airflow around a heat exchanger with the finned tubes in the electrotechnical box, by finite volume method in the program Fluent implemented in the program ANSYS Workbench. The work contains an analysis of the impact of forced airflow on the heat exchanger with the various placed the electrical components. The primary objective of this work is to analyze and evaluate the numerical simulation models to optimize the forced flow around the heat exchanger and...

The use of the trenchless method of laying underground communications is a profitable alternative to the use of open methods. The method of vibro-impact immersion of steel pipes with an open front end into the ground is widely used. Regular cleaning of the pipe from the formed soil core is one of the most important operations in this technology. The parameters of the soil plug (density, linear dimensions) depend on the physical and mechanical properties of the soil in which the work is performed. The purpose of th...

Carabids are an important family of predatory species that regulate harmful insect species from fruit plantations. The researches made clearly show the structure of the taxa, their dynamics and their abundance.In order to collect the biological material from the apple fruit tree plantations, were used soil traps type Barber, which in each of the two years of research (2017-2018) was represented by six traps placed at ground level in the row of trees, and as a liquid we used a salt solution with 25% concentration. ...

The research was done in some agricultural ecosystems represented by a fruit tree plantation and an autumn wheat crop at SC Loturi Service SRL Delesti, Vaslui County. The collection of entomological material was done using Barber soil traps. In each year of research, studies were conducted over almost the entire growing season, from May to September. The harvesting of the trap was done at intervals ranging from 7 to 14 days, the number being vaied from one year to the next. From the collected material, only the sp...

Ni-P-Sn layers were deposited on the steel strip, with less carbon, by electroless method. An electrolyte based on nickel chloride, sodium hypophosphite, tin chloride and additions for bath optimizing were utilized. The influence on the deposited layers characteristics of different amounts of tin chloride in the nickel bath, respectively, 0.1g/L and 0.4g/L was studied. The conditions for electrolyte formation and optimum working parameters: pH and temperature were set. Ni-P-Sn layers were characterized by comparis...

Risk assessment is a concept introduced for analysing the safety level in workplaces in order to assess if enough and proper precautions have been taken or if their number and quality should be improved so that to prevent hazardous situations. The underground coal mining industry is very hazardous, facing serious fatalities related to work, workplaces and workers as a consequence of the high-risk processes carried out underground and of the hazardous toxic and explosive atmosphere. The use of electrical equipment ...

Aluminium is not essential but could be harmful to human health, being associated with severe diseases of the nervous system, such as Parkinson's disease, amyotrophic lateral sclerosis (Lou Gehrig's disease) and Alzheimer's disease. Dissolved aluminium can become toxic to aquatic life and to the roots of sensitive plant species. Exposure to aluminium from water is a concern in Sofia region since its concentrations occasionally exceed the environmental quality standard for Iskar river, which is the main drinking wa...

Hyperalkaline (pH>10.5) springs are extremely rare. There are only about ten in the entire world. This type of water has been identified in an ultramafic massif in central Serbia, on Mt. Studena, during the course of investigations conducted in 2017. The investigations included prospecting, terrain mapping and sampling, followed by assessment of data collected in situ and from laboratory analyses. The hyperalkaline spring is of the ascending type, its yield is very low (~0.05 L/s), and the water emerges in a diffu...

Currently, the issue of the possible negative influence of nanoparticles on human health is inadequate in comparison with the presentation of their positives. Although there is no questioned their undeniable importance on the other hand experts agree that the precautionary principle and related measures are missing and necessary. The paper presents the pilot results of a grant project focused at the creating a methodological guideline aimed at increasing the level of occupational health and safety management at wo...

The Volga-Ural oil and gas region (Russia) is the most geologically studied. Numerous studies have proved the relationship between neotectonic activity and oil-bearing structures of the sedimentary cover. Previously, a detailed fault map has been compiled for the crystalline basement of the region. In the conditions of depletion of traditional reserves in anticline traps, the most in-demand objects of further hydrocarbon searches are tectonically screened oil accumulation. Remote sensing and GIS techniques were us...

Recognition of the numbers is a necessary condition for the development of 3D street viewers. Using information about the position of the viewer relative to the detected site by self-driving car will make it possible to adjust the path and increase the accuracy of its implementation. The unmanned device (unmanned aerial vehicle or self-driving car) is equipped with a video camera or camcorder system. In the process of detecting house numbers, the image from the camera contains noises and redundant information. The...

The work is devoted to the development of an approach allowing us to visualize complex infrastructure networks. The results of testing various layout algorithms on the plane of the graph representing the complex infastructure network are presented. The method of automatic graph layout is offered, which allows to efficiently perform the layout of a graph of a large-scale infrastructure network. The method of clustering the graph of the infrastructure network, taking into account the strength of the branches and the...

This work initiates a study toward developing and applying computation models of cyber-physical systems on the basis of hexagonal lattice. The focus is on mathematical description of continuous population dynamics combined with dynamic logic used for discrete events. First, we introduce a class of lattice differential equations with time delay simulating interactions within hexagonal pixels. Spatial operator is modeling diffusion-like interaction between hexagonal pixels. We then use the syntax of dynamic logic to...

In the work there is offered approach to determine index of quality of city environment which is used for development of master plan of a city. As an example of application of this methodology there is considered the project of master plan of Ternopil with help of geoinformational system. Over the past two decades the cities of Ukraine are undergoing a new phase of their development, which is associated with a radical change in the economic system (the transition from the planned management to a market economy) wi...

Diapir Folds Zone (= Mio-Pliocene Zone) as major subunit of the Carpathian Foredeep lies between the Buzau and Dambovita valleys and between the folds of the inner Carpathians and the external flanks of the Carpathian Foredeep. This geological unit represents the most prolific zones of accumulation in Romania in which numerous hydrocarbon deposits of Tertiary age have been discovered in more than 150 years of exploration. Diapir Folds Zone can be considered a world class hydrocarbon province having several ?giant?...

Recent online translators for languages without a significant number of speakers cannot reach the quality of the translators for languages such as English, Spanish, and French, etc. The great number of users of these common languages means a higher possibility of correction of an inaccurate translation. For those languages with around ten, twenty million speakers, translators cannot gain such effectivity. All the documents produced in the EU must be translated into all the languages of the EU. Translators that hav...

From geological point of view tailings dam materials are different compared to regular types of soil. In mechanical aspects it is material that has regular mechanical properties like shear parameters and deformation moduli. Based on the huge expansion of the hardening soil model in the last 20 years, this paper discusses the E50 modulus and its relation to some of the well-known physical soil properties. Expressions of E50 in respect to water content, grain size distribution, void ration, site depth and confining ...

One of the important environmental problems in the development of copper ore deposits is the pollution of biological objects located in the zone of influence of mining enterprises. This problem is most relevant for sulfide copper ore deposits, which include a number of heavy metals that are toxic to the environment. Geochemical processes, occurring during the development of such deposits, lead to the entry of heavy metals into the surrounding landscape and their accumulation in the grassy vegetation. It is necessa...

This article deals with the features of legal regulation of administrative liability for environmental offenses in the Russian Federation, as well as the main difficulties encountered of its implementation. The legislator is paying more and more attention to ensuring environmental safety as one of the most important directions of the domestic policy. In this paper there is a conclusion about the variety of legal acts in this sphere at the present stage. Also the authors determine the main modern theoretical and pr...

Contributions to the behavior of rock materials under various conditions provide a practical knowledge about issues relating the performance and long-term serviceability of rocks. In this study, various limestones with varying textural features were investigated in terms of their resistance against magnesium sulfate weathering tests. For this purpose, initial physico-mechanical properties of limestones were determined. Then, rock materials were subjected to magnesium sulfate weathering tests (up to 20 cycles) and ...

Silver and gold nanoparticles have unique antimicrobial and antifungal properties that make them excellent candidates for applications in nanomedicine, tissue engineering and bio-imaging. Green synthesis of metallic nanoparticles is preferred over conventional chemical routes because is eco-friendly, requires no reducing agents and no toxic chemicals result. In the present research study, one-pot green synthesis of noble metallic nanoparticles, namely silver (AgNPs) and gold (AuNPs) nanoparticles, from aqueous ext...

We have developed an online information system of digitized B-images and histological patterns acquired from more than 500 patients. In this system, the data are stored in the form of text and image information. For each patient, there is stored information about anamnesis and diagnosis with B-images and histological patterns of atherosclerotic plaques. Firstly, the database is primarily intended for an experienced neurologist to store clinical data for various clinical studies in neurology. In the second phase, t...

Fluorescence analysis is widely used in various scientific fields. It has many practical applications in biology, medicine and chemistry. Geoscientists can benefit from using it as well. For example, hydrocarbon saturation and carbonate content can be measured by illuminating rock samples with ultraviolet light and evaluating the intensity of emitted visible light. The most interesting case is where the wavelength of the released light is greater than that of the incident light. In geology and geophysics, fluoresc...

In Czechia, climate change is already becoming a reality, and its consequences can be seen in the Czech countryside and landscape, but also in form of water shortages in water supply systems. In Hydrology, the most urgent problem is that the values of the long-term mean flows are decreasing in rivers as well as the yield of groundwater sources. One of the climate change adaptation measures is precise the reservoir capacity and reservoir operation policy in an uncertain condition. That means considered uncertainty ...

Economic dispatching is a significant analytical function associated with the Energy Management System (EMS) activity. Economic dispatch is well-defined as the development of distributing production levels to switchboards so that the organism load is delivered fully and economically. The purpose of static commercial transmission is to calculate the harvested power of each generation division for a certain period of time so that all requirements with minimal cost are met when different technical limitations of the ...

The contribution aims to unify the procedures for the creation of anthropogenic soil profiles in the mining areas of the Ore Mountains foothills (Podkrusnohori) and to present a comprehensive overview of the possibilities of using permanent grasslands in soil protection with a focus on the Usti nad Labem Region in the Podkrusnohori area, especially the wider area of the Most Basin, where the creation of anthropogenic soil profiles is an essential part of the technical reclamation of spoil tip and quarrying sites. ...

This paper proposed an optimized method used for determination of minor elements (Cu, Zn, Mn) from Romanian biomass ash from three different biomass ash using ICP-MS technique. The purpose of the study was to find a suitable method of analysis for the complex matrix of biomass ash by comparing two samples preparation methods: at 5500C and 8200C. For this study the content of metals from three different samples from forestry and related industries (P1), forestry and exploitation (P2) and agriculture (P3) was analyz...

The paper presents the results obtained in the assessment of seismic action of blasting performed in four Romanian salt mines where small room ad square pillar method is applied. Function of the time taken to mine a level, of the size of the rooms in course of excavation, of the medium radius of the area with elastic deformations, and the results of the seismic measurements, the explosive charges possible to be blasted were established for each separate seam, providing in the same time seismic protection for the f...

Production of high-viscosity oil reserves is accompanied by digital modeling. Use of enhanced oil recovery methods involves the synthesis of optimal control of the injected agents? effects. The system for modeling of non-isothermal multiphase filtration processes currently under development is based on the use of the finite element method. This allows to detail the formation heterogeneities and processes taking place in the wells and in the near-well regions. The objective function includes minimization of water c...

The paper analyzes the existing methods and tools for removing oil or petroleum products from the water surface as a result of the oil and petroleum product pipeline rupture. The main groups of methods with indication of their main disadvantages are presented. On the basis of the data obtained, the main direction of the combination of oil spill response methods is established in order to reduce the time of measures and improve the quality of water treatment. A set of activities aimed at minimizing the occurrence a...

This study aimed to identify a rational treatment for soil and determine the efficiency of the use of chelated liquid microfertilizers on the yield of spring hard wheat crops in chernozemic soils of the Samara Region of Russia. The study was conducted as a two-factor field experiment using a recognized variety of spring hard wheat:?Bezenchukskaya stepnaya?. The soil of the experimental field was typical medium-deep heavy loamy chernozem. Data on some agrophysical properties of the soil, weed infestation of crops, ...

The article deals with the approach to solving the problem of optimization of the educational process using adaptive training complexes. During the analysis of the subject area it was found that there is no detailed and formalized model of the learning process with the use of training complexes. For this reason, it is also difficult to set and solve the problem of optimizing the learning process. Therefore, the authors propose the necessary mathematical support to formalize the learning process at the training com...

The aim of the work was to optimize the process of obtaining multicomponent protein compositions with high biological value and higher functional properties than the original vegetable protein products. Initially, studies were carried out to obtain a biocomposite composition of dry wheat gluten (DWG) - pea protein, DWG-potato protein, potato protein-oat protein. Composites are enriched with all three limiting amino acids: lysine, threonine, sulfur-containing amino acids. For each of the essential amino acids, amin...

The research task presented in the paper covers utilization of computer based method for performance optimization and penetration estimation of shaped charges. The code is used in computer simulations, depicting dynamic non-linear phenomena. This is a perfect tool describing such phenomena as: expansion of detonation products, propagation of shock wave, rapid strains. The LS-DYNA program is used in many scientific and industrial fields, both on an initial stages of product development and on its final stage. The c...

At national and world wide level, raw materials consumption is steadily increasing due to industrial development and population growth. In this context, production of basic raw materials, and in particular of fossil fuels, natural gas and coal, is constantly increasing. For underground coal mining are used a complex network of horizontal, vertical and inclined mine workings with the purpose of extraction, transportation and evacuation of coal. Associated with the system of mine workings, there is a ventilation net...

The Pechenga ore region spatially combines platinum-metal plutogenic, copper?nickel volcano?plutogenic, uranium-ore and gold-ore fluid-metasomatic systems, which are formed under different geotectonic regimes in the Karelian and Svecofennian (2.4?1.6 billion years) stages of development of the Baltic shield, as well as lead-zinc mineralization of the Paleozoic age. At the same time, the role of mantle sources and processes in the formation of ore mineralization decreased, and intra-crustal mineralization increased...

In 20-21 the Century the environment protection is a main question in Europe. One of the answer is organic farming. In organic farming the farmers and producers produce food without using chemicals and artificial fertilizer. Today the organic food? market is large enough to research its characteristic. The article researches EU organic farming situation and in a region of its characteristics. European countries? situation is analysed and the question is what did and what to do in the future for the consumers to be...

Selective cutting plots with the use of evenly-gradually local method for forest plantations it is proposed to apply where as part of the next assignment. After selective felling is dominated by linden. This tree species is very closely linked with valuable timber and at the same time preserves the nectar production of the trees. When using the proposed purpose of logging allows you to create a complex mixed forest of natural origin of Linden and surrounded by other honey plants due to their conservation. Thus, in...

Organization of the Access database of the Lojane As-Sb deposit Northern Macedonia represents the first attempt of this paper authors to synthesize geological exploration data of this ore bearing locality in one professional database available for the interested parties. Since we are relatively experienced in compiling similar databases for numerous deposits (Bucim, Borov Dol, Kadiica, Sasa etc.), we had a critical knowledge needed to to organize representative Access database for the Lojane deposit. The Lojane de...

From the aspect of new and undiscovered conventional ore deposits of metallic raw materials the territory of Europe becomes more and more exhausted. In that regard slowly but steadily, alternatives are looked for. Namely, professionals became very aware of the anthropogenically introduced tailing and smelting dams/dumps and metal concentrations contained within. The European trends are leaning toward that path to provide fresh metal raw material sources for the developing industry. In that direction, bearing in mi...

The article is devoted to the study of the legal framework of the Russian state, designed to ensure the sustainable development of the Arctic territories. According to the authors of this article, the desire to ensure the sustainable development of the Arctic zone was the basis for the adoption of a number of important strategic documents containing the requirements of environmental safety in the implementation of economic activities in the Russian Arctic. At the same time, the authors note the weaknesses in manag...

When identifying and assessing production reserves leading position occupied by the problem of rational load of the productive apparatus, because the fullest satisfaction of the demand made by increasing the production of finished products, to optimize load capacities of the enterprise while reducing production costs. In the context of the current unstable economic situation, enterprises need to adapt to the ever-changing conditions of the external environment and, first of all, to deal with competitors producing ...

Poultry meat and table eggs are known to be a popular food items all over the world. The nutritional value of poultry white meat is of great value over the red meat. It contains considerable amount of protein, minerals, vitamins, and fat. In order to ensure a good quality of poultry products, the flock should be a good health and free from infectious agents. Antibiotics were widely used to prevent diseases in poultry flocks. However, using antibiotics for long time may lead to microbes that are resistant to drugs....

In accordance with the hypothesis of cold homogeneous accretion, it is usually assumed that the Earth?s core and mantle resulted from the gravitational separation of iron and silicate particles in its interior. According to this scenario, the core and mantle temperatures should not differ significantly. Therefore, the reason for mantle convection is difficult to explain. Recent data on the rapid accretion of planets, on the existence of magmatic fractionation trends in mantle xenoliths and in rocks of the crystall...

In-situ combustion (ISC) is an enhanced oil recovery process where heat and flus gases (combustion gases) are generated by burning a portion of crude oil to reduce oil viscosity and pressurize the system in the reservoir. Overall, in this method, air is injected to the reservoir, after the ignition process (self-ignition or artificial ignition), a combustion front is formed and moves toward the producer well. Nowadays, using metal oxide catalysts is considered as a possible and feasible route to improve the oxidat...

Along the north-eastern and eastern margins of the Siberian platform extends the foreland zone of the Verkhoyansk fold-and-thrust belt (VFTB) to the west of which is the Priverkhoyansk foredeep. On the north, the platform is bounded by the Olenek folded zone with the Lena-Anabar basin located to its south. Various authors identified a number of deformational events in the Late Mesozoic tectonic history of the region, of which the nature, kinematics and relationships are as yet poorly studied. We carried out detail...

The paper is part of the analysis of the current issues on the challenges that should lead to a sustainable future based on the optimization of production processes and the reduction of waste, with a first contribution on a leading agricultural sector in Italy. In agriculture, there are very different experiences and practices, each of which has the potential to develop indicators to monitor report and communicate trends and progress towards the implementation of the circular economy. In this context, the document...

Morphogenesis of structural elements of secondary xylem is associated with the biosynthesis of a massive secondary cell wall consisting of three layers, differing in mass, composition and structural organization. Cellulosic microfibrils are basic structural elements fixing cell walls. The participation of cellulases in cellulose biosynthesis is shown. Overexpression of cellulases (EGase) increased cell expansion and elongation and resulted in an increase in plant growth and biomass production. However, the precise...

All wind turbines have their main components (the rotor, mechanical transmission, generator) housed in a nacelle, supported by a pillar (large-sized) or a prop (small or medium-sized). Such a prop can be a guyed, a free standing, or a hydraulic one. While the former types of props require a lifting device for turbine installation and maintenance, the third type is provided with its own hydraulic system, which performs these operations. The hydraulic prop, which may have a height of 12...30 m and support wind turbi...