Browse

As a result of mining activity on the earth?s surface the phenomena that have negative effect on the objects in area of influence of extracted area exist. Depending on geomechanical qualities of hanging wall and surrounding rocks, geological conditions of depositing, seam and depth of position of deposit, critical angle of influence, way and time course of mining and other parameters the horizontal and vertical movements always appear to a greater or lesser extent. They can be described by inclination, proportiona...

One of the most effective ways to interpret the geological setting of a deposit is building its 3D model. Presenting data in form of a 3D model enables quick and convenient access to relevant information, facilitates taking decisions associated with deposit management and helps plan mining operations. With a model of the geological setting of a deposit it is possible to prepare different variants of a coal mine model as well as type of mining technology, to tackle work-related safety issues and to achieve optimal ...

In this paper we present a case study on the identification and contouring of a gas deposit, placed mainly in Pontian formations. This study is based on some geological landmarks as well as the interpretation of filtered gravimetric and magnetometric data. The gas deposits determine minimum gravimetric anomalies, under the specific geological conditions of the Transylvanian Basin. Such gravimetric minimum is determined on the one hand by the rise of the salt, and on the other hand by the mass deficit within the sa...

In this paper, a computational method to predict the dimensional changes in some powder metallurgy materials is used. The samples prepared from pre-alloyed iron base powders produced by atomization (< 45, 45-63, 63-100, 100-150, >150?m) were the materials analyzed in this paper. The analyzed powders were compressed in a mold using uniaxial pressing at 400 and 600 MPa with the disc dimensions of ? 8 ? 6 mm. The sintering temperature was approximately 1.150 °C for 60 and 90 minutes. The density in green and sintered...

Small and medium-sized enterprises (SMEs) use energy consulting as an important instrument for reducing information deficits when investigating savings potentials and measures for improving enterprises? energy efficiency. Since 2012, Germany has implemented a government support program to help cover the costs of energy consulting for small and medium-sized enterprises that have an energy audit carried out by a qualified consultant. This work examines the results of over 290 companies with energy balances in the pe...

A generalized spectral-analytical method (GSAM) for analyzing data of various physical nature has been developed. It is based on the generalized Fourier representation of the original experimental and model digital arrays. In this report, it is used in the implementation of a resonant-impedance method for diagnosing and studying the characteristics of mechanical systems (in particular, linear one-dimensional acoustic systems with local anomalies). In the framework of this approach, the anomaly (damage) of the syst...

Vulnerability may be considered one of the most important components of the seismic risk, as it is the only one that human society may act upon in order to reduce the risk. As seismic vulnerability implies multiple dimensions, from the physical one to the social and economic ones, a multi-criteria decision-making approach proves to be appropriate for its assessment. The uncertainty inherently involved in the assessment process is addressed using fuzzy logic theory. This paper aims to assess the seismic vulnerabili...

Optimization plays a key role in various fields of science specially engineering to simplify the decision making process. Long-term production scheduling (LTPS) of open pit mines is a large-scale optimization problem to determine the block extraction sequence to maximize the net present value considering technical, economic constraints. For many optimization problems, finding the best solution is intricate and time-consuming. In such cases, a combination of mathematical methods and meta-heuristic techniques provid...

Long-term production scheduling (LTPS) is an important and vital part of the planning process of open pit mines. It defines an extraction sequence of the mineralized material that produces maximum possible net present value (NPV) while satisfying a physical and operational constraints. LTPS of open pit mines is a large scale and intricate optimization problem that has been widely discussed in the technical literature since 1960s. Production scheduling problems are NP-hard and there is a need to improve the plannin...

The oil price crisis has changed the way how we treat our producing wells. Nowadays production intensification is not just a possible option to increase the flow rate of wells with poor performance, but a treatment we must consider for every well to achieve ultimate productivity. However, before the actual treatment a series of different steps are necessary to take, such as candidate selection, method selection, treatment planning and decision making. These steps require the cooperation of different personnel, mos...

Economic analysis was performed for a new process that will be adapted to an existing coal-fired power plant process in order to recycle bottom ash with the objective of obtaining synthetic graphite. Synthetic graphite is a valuable raw material with many industrial applications. It can replace successfully natural graphite, saving capital and environmental costs associated to graphite extraction. Bottom ash resulting from combustion of low quality lignite at a Romanian coal-fired power plant contains significant ...

Heat exchangers are important components of cryogenic installations. The modern and advanced cryogenic systems have bulky heat exchangers, weigh tens of tons, are made of copper and its alloys, stainless steel or aluminum. The main challenge in the field is related to the need to reduce size and weight of the heat exchangers by using appropriate construction shape and modern materials. Heat exchangers used in cryogenics can be divided into three main groups: tubular, spiral and efficient or compact exchangers. In ...

The paper focuses on interconnectedness of human and environment with rapidly rising urban space developments in Lahore ? the second largest city of Pakistan. The city has a long history of more than 2000 years. It reflects the developmental aspects of Mughal Era and remnants of British colonial rule. From 1999 to 2011 the growth rate of the city in terms of built up area has doubled. Thus, mounting a huge pressure on the city administration responsible of managing infrastructure and slum settlements. Due to rapid...

The landslide cycle of development of deep-seated landslides begins when a new landslide block is being separated from the bedrock mass. It completes when this landslide block is displaced to the level of a landslide terrace, situated on the landslide slope. The initial stress state in the bedrock mass with horizontal earth surface (before the landslide block forms) is regulated by the Mohr-Coulomb criterion. The appearing of a landslide cirque as well as the sliding basis causes the change in the initial stress s...

The aim of work was to evaluate the influence of the grown locality on heavy metal intake (Zn, Cu, Cr, Co, Ni, Pb and Cd) from the soil to the soybean seeds. The research was realised in five different localities of Slovakia using the same soybean cultivar (Mentor). The total content of heavy metals and their mobile forms in individual soils was compared with the limit values according to Law 220/2004 and the European Commission (2006). In all soil samples the determined total content of Cd and in one locality als...

Currently, one of actual problems of exploration geology and mining, while estimating and exploiting mineral deposits, is to improve the accuracy and reliability of minerals contouring. This problem applies both to the deposit contouring in general, and to the contouring of various interested areas within ore bodies - waste rocks, various natural ore types and technological ore grades etc. In order to solve this problem, geostatistical method of spatial variable study - indicator variogram and indicator kriging is...

The authors presents part of his case study for the implementation of ?parametric budgeting? innovation in this article, presenting it in respective construction company, focused on construction of passive and low-energy family houses on the basis of wood ? green buildings. In general, the study focuses on meeting of innovation objectives in the area of construction objects? pricing with focus on preparation of price offers for the construction of low-energy and passive building, designed for living, in the Czech ...

In the NW part of the Romania, there are geological conditions that allow to geothermal phenomena to manifest on the surface of the Earth. The limited exploitation of this energy resource is still limited by existing technologies and by the high cost of deep-water equipment. For a good image of the Romania's geothermal potential, we present, in our paper, the temperature map at 3000 m deep and the geothermal flow map on the surface. These maps were made with the Surfer program, based on the data obtained through d...

Matrix metalloproteinases (MMP) belong to the family of zinc metalloprotenases, whose function is related to the metabolism of the extracellular matrix proteins. These enzymes play an important role in the development of physiological processes such as morphogenesis, resorption and tissue remodeling, migration, adhesion, cell differentiation and proliferation, as well as in pathological conditions (rheumatoid arthritis, glomerulonephritis, periodontitis, ulceration of the cornea, etc.). To the first, the most stud...

During the last years, under Schlumberger brand, several methods have been refined for determining detailed characteristics of geological formations, as they are necessary in the assessment of shale gas potential based on drilling core investigations, wells diagraphies investigations, seismic investigations, and combination of all these. The correct determination of lithofacies of the cores leads to a quality diagnosis of shales reservoirs. The accurate mineralogy input is obtained by Litho Scanner in the sCore li...

The article focusses on ageing cycling infrastructure and issues of sustainability from the perspective of pavement management system and economic implications. Light cycling paths pavements are well suited to bear non-motorised traffic without suffering plastic deformations. Given that draining is maintained and adjacent vegetation is regularly cut, these pavements can perform well for very long periods. That said, the pavements still succumb to climatic effects acting on the pavement?s surfacing. Chemical proper...

Study aims to detect the hazardous elements in the ambient air at inside university environment. Air pollution was evaluated using moss and lichen bag technique. One lichen (Hypogymnia physodes) and one moss (Dicrannum scoparium) taxa were used for research purposes. Research was conducted in four room types (laboratory, hall, office and pc rooms) and two different moisture treatments (without intervention, regularly moistened) were conducted. Relative accumulation factor (RAF) was used in order to assess each ris...

Within the framework of this work the solution of the problem of synthesis of adaptive electronic document management system (EDMS) is considered. An important problem of modern information systems is their personalization to the individual characteristics of users. This improves their efficiency, flexibility, convenience and productivity. To solve the problem of synthesis of adaptive EDMS proposed algorithmic and mathematical support, the original concept of information system architecture and the use of machine ...

The article presents standard and alternative methods of managing sewage sludge and the biodegradable fraction of municipal waste. The work focuses on sewage sludge and bio-waste not contaminated with heavy metals. The absence of the abovementioned impurities enables their processing that they can become a valuable product with high fertilizer value. In the work, special emphasis was placed on techniques similar to natural, i.e. composting and vermicomposting. These two methods are most widely described because th...

The main purpose of this study was to evaluate the capacity of an activated zeolite for ammonium removal in fixed-bed column. The influence of process parameters, such as activated natural zeolite quantity (1 - 6 g) and ammonium initial concentration (10 - 70 mg/L) was investigated. The experimental results were analyzed using the most common sorption kinetic models, such as Thomas, Adam-Bohart, as well Clark, by linear regression analysis in order to characterize the removal process. The obtained values showed th...

Today, under the conditions of negative effects of the influence of natural and, especially, anthropogenic factors on the natural environment, automated systems for monitoring the state of the environment are spreading. The purpose of the work is to develop an analytical decision support system based on the results of forecasting indicators of surface water pollution of the city Lviv. To analyze and forecast the indicators of surface water pollution in Lviv, a trained neural network was created using the Python pr...

The geological modeling is an actively developing area of petroleum geoscience. One of the limiting factors for geological modeling is the processing of input data, which is a routine process and can be automatized. The paper describes the screening for an effective approach and development of the workflow allowing automatical depth matching of well logs with the use of statistical methods of data analysis basing on the real set of wells. The purpose of this work is to study the machine learning algorithms applica...

Natural dyes gained considerable attractiveness in textile manufacturing based on the negative impact of synthetic dyes on the environment and human health. The aim of the present study was to develop an efficient extractive technology of anthocyanins from Hibiscus sabdariffa, and to comparatively investigate the dyeing of cotton with the natural extract, in the presence and absence of (bio)mordants. The results of extraction processes using eco-friendly solvents and different solvent/solid ratio and extraction ti...

Last decades witnessed a significant increasing in energy consumption in data centers and server rooms. More powerful equipment and more complex IT services have been driving to more power demand. Since infrastructure and energy costs in data centers have become a central factor in IT management, a range of technologies has been developed to increase energy efficiency. New hardware and power management options support energy saving strategies. An appropriate procurement plan is essential for building an efficient ...

A survey carried out in October 2018 on Cricovului Sarat Valley, along a distance of about 5 km that crossed the Gornet-Cricov commune revealed few ecological aspects of this Subcarpathian area located in Prahova County, Romania. We inventoried the resources of vegetation and associated invertebrates, listing the most relevant taxons that populate the river banks. So far, representatives from 15 plant families (Adoxaceae, Amaranthaceae, Apiaceae, Asteraceae, Caryophyllaceae, Euphorbiaceae, Fabaceae, Plantaginaceae...

At the present state, the LIDAR systems have different configurations and geometries, according to their applications. The multi-wavelength Raman and depolarization LIDAR systems used in the European Aerosol Research Lidar Network ? EARLINET are suitable to provide an extended set of optical parameters for aerosol characterization which can be used in climatology studies, models and different events like Saharan dust outbreaks, transport of smoke plumes or volcanic ash. The aerosol in the atmosphere is present mos...

The paper suggests the use of diagnostic features in the form of decomposition coefficients of biosignals statistical estimates in the normal range and in different types of pathologies obtained on the basis of a mathematical model in the form of a cyclic random process. As a criterion for choosing the necessary spectral coefficients of the biosignal decompositions in the Fourier basis set, was chosen the energy criterion. As diagnostic features, was used a such spectral coefficients that according to the Bessel i...

The aim of paper is the evaluation and analysis of the change of rainwater runoff for the proposed extension of the building and the assessment of the impact of the extension of the building on the drainage of flood waters. The annex is situated on the northwest side of the SO1 building and on the northeast side of the SO2 building. The extension extends the existing surface and connects the two existing objects to a single entity. The proposed extension is located in the Q20 floodplain area of the Lobezsky stream...

Generally, in Romania, the management of landfills is a major concern with regard to existing circumstances. Although the percentage of recycled waste is increasing, there are still many previously built landfills that are currently in the post-management phase. The negative impact of landfills is represented by leachate built-ups, that contains heavy metals and can pollute soil, groundwater and surface waters and endanger population?s health. European waste legislation requires closure of non-compliant landfills ...

The article describes the results of implementation tracer studies at one of the complex fractured-cavernous carbonate reservoir in the Republic of Tatarstan. Water injection in one well leaded to the water cut rise in one producer well then neighbor wells are insignificantly reacting on the pressure maintenance. On one hand low efficiency of water flooding in carbonates can be caused by hydrophobic properties of minerals like calcite and by heterogeneity of the void space including presence of fractures and caver...

Ability of farms to undertake investments greatly depends on the production potential, production scale and thus on an economic force which may be described as an ability to develop and grow. This force, called economic effectiveness, is measured with the level of income that should cover not only the costs of use of own production factors i.e. land, capital, and work, but also enable investing in new assets of a farm. Since, if it does not obtain such incomes, then it ceases investment purchases and after some ti...

Among the methods used in the management of municipal waste, one can distinguish, their combustion in installations for the thermal treatment of municipal waste (ITPOK). The advantage of this method implemented in modern installations is the reduction of the mass and volume of waste with simultaneous very efficient cogeneration of heat and electricity, while minimizing emissions. One of the possibilities of including ITPOK in the implementation of the Circular Economy idea regarding raw material recovery is the us...

This paper analyses the structure made from fair faced concrete compared to a conventional concrete sandwich structure with a surface finish in terms of bound CO2 emissions. This article also takes into account the length of service life of the individual constructions. For each of these structures, an analysis for high-performance concrete (HPC) and conventional iron-reinforced concrete (sometime called normal strength concrete NSC) is provided. Due to the current tendency of construction from colored fair-face c...

The article presents the results of the analysis of the dependence of the effectiveness of requests submitted to scientific competitions from the criteria for their evaluation. Statistics of requests submitted to external competitions from ITMO University was obtained from the implemented automated system for requests recording. This system performs the functions of formation of the register of requests of the organization, and also allows to check the requests for their compliance with the requirements of the sel...

The article deals with the analysis of the filling quantity of the available soil water storage (in depth of 0 ? 30 cm) on the protected soil resources only in arable land of the Zitava river catchment (Slovakia). The filling quantity of available soil water storage is expressed by the ratio between the currently available soil water storage and the potentially available soil water storage. The filling quantity of available soil water storage in protected soil resources in the territory was analysed in two years, ...

Managed by the Conservation of Forests of Oum El Bouaghi, the forest of Sidi R?Ghies which is primarily for forestry covers an area of 3106 hectares. This area consists of several species. The current ecological status of the forest is poorly understood. The precise knowledge of existing forest resources and their evolution has become indispensable. The objective of our study is to collect data on the current environmental status of the site and timber resources in order to establish a reference state (zero state)...

Since 1990, there have been changes regarding land use and land cover in Romania, due to the new socio-economic conditions. The main objective of this study was to evaluate the landscape fragmentation in the Romanian Subcarpathian area, during the post-communism period, determined by anthropic activities in the context of new adopted regulations on agricultural land resources. We made a comparative study between Prahova Subcarpathians and Buzau Subcarpathians, characterized by similar geomorphological patterns but...

The aim of the paper is to analyze the impact of natural disasters on the economic activity of companies by a modified DuPont model. The proposed modified DuPont model includes ratios for economic efficiency, profitability and financial autonomy. Usually the DuPont analysis model is used to evaluate the component parts of a company's return on equity (ROE). This allows an investor to determine what financial activities are contributing most to the changes in ROE. DuPont analysis divides ROE into its constituent co...

The further development and existence of civilisation is significantly dependent on ecological awareness and the related actions undertaken by individual countries. The rapid and unprecedented economic growth of the 19th and 20th centuries has resulted in a significant imbalance of the natural environment. One of the more important consequences of this growth is the emission of large amounts of greenhouse gases and other pollutants. This leads to soil, water, and air contamination, thereby negatively affecting the...

The wood market is constantly undergoing transformation, which leads to the variation of the price of wood, sometimes significant, from one area to another. In addition, the geographical distribution of forest species and the needs of the woodworking market often make that the wood necessary to be purchased from long distances, so transported over considerable distances and with considerable costs. Thus, the article aims to analyse the transport distances for wood mass purchased by a woodworking company from Braso...

The purpose of the article is to analyze the unloading times of the raw material used in manufacturing OSB boards. In this regard, there were centralized all the entries of raw material from July and October 2016, when the wood was transported on roads. Data analysis was done taking into account the type of means of transport (truck or trailer truck), volumes and species transported. It has been found that, as a rule, the means of transport comply with the tonnage allowed on public roads, but there are also exceed...

The paper deals with the actual problem of assessing the quality of video content transmission in modern wireless networks. A review and analysis is made for the quality level of the currently most popular protocols and technologies for transmitting video content in wireless networks. It analyzes video content transfer technologies based on the HyperText Transfer Protocol (HTTP), namely HTTP Progressive Download (HPD) and HTTP Adaptive Streaming (HAS). For HTTP Progressive Download and HTTP Adaptive Streaming tech...

Soil Swelling is a relatively complicated phenomenon not yet fully understood by researchers; however, it has been proved to be a physiochemical phenomenon related to soil and location. A tunnel support system can undergo failure upon completion of construction unless sufficient knowledge of expansive soil behavior is obtained and due procedures are followed to prevent the adverse effects thereof. This is a comprehensive study conducted on the physiochemical parameters affecting soil expansion, aimed at determinin...

It is shown that the corrosion-electrochemical behavior of coatings with iron (cobalt) tungsten alloys depends on the content of the refractory component, and the increase in chemical resistance in an acidic medium is due to the formation of acidic tungsten oxides on the surface. The use of artificial neural networks allowed us to identify the most significant parameters that determine the corrosion resistance of alloys. Electrolysis was carried out in a glass cell for a two-electrode scheme using planar positione...

In this study, the anomalous geomagnetic variation related to the moderate Vrancea earthquake (Mw=5.5) on 28 October 2018 was shown. This anomaly and its associated seismicity were analyzed and compared with a similar anomaly which occurred on October 2016- May 2017. To better distinguish the seismotectonic anomalies from external geomagnetic variations (geomagnetic storms), the datasets recorded at Muntele Rosu (MLR) located inside seismogenic zone were compared with datasets recorded at Surlari (SUA) located at ...