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The paper deals with the verification of the possibility of using the froth separation to separate highly concentrated coarse-grained black coal slurry. For laboratory research samples of raw coal with a grain size fraction of 0,2 - 2 mm from the Paskov Mine were used. The achieved se paration results confirmed the ability of froth separation to separate coarse-grained highly concentrated sl urry. The coal slurry in concentrations of 332 kg.m -3, 400 kg.m-3, 500 kg.m -3, 600 kg m -3, 668 kg m-3 was successfully se...

In the world, over 18 million vehicles are rejected annually from operation. The spent catalysts are obtained from th e vehicles at the end of their life cycle as well as the vehicles which do not meet the prescribed st andards in the ECO test respected to the composition of exhaust gases. The basis of each catalyst is a ceramic monolith with deposited valuable platinum metals. The spent catalysts are solid waste and also the rich raw material for recovery of precious metals. The aim of this paper is a separation ...

Energetic theory of disintegration repres ents the starting point for the search for optimum of rock cutting, as it issues from the instantaneous advance rate of the indentor, specific cutting energy (am ount of energy used for cutting of a unit volume of rock) depending of applied thrust. Search for optimum on experimental drilling stand using the optimization met hods is impossible due to technological limitations (limited area for optimum search due to limited rock sample length, duration of experiment, possibl...

The current paper marks the early stage of the PhD thesis of the first author of the paper. The thesis includes partial creation of an educational repository system, which should become a highly flexible portal that gives a ccess to variety of educational resources. The simulation of the development of the repos itory system is the main topic of this paper. The human resources needed for the su ccessful end of the project are centric for the simulation which can be quite useful not only for developers of similar s...

Developed is software package for acoustic calculations, named SoundBG. Described program modules should be considered as a fi rst step in creating a sufficiently complete programming library for acous tic calculations, which will gradually replace the traditional graphics, tables and approximate formulas.

Solid waste management has become an environmental concern for many developing countries including Libya country. There have been several significant obstacles facing the city of Al-Abyar in dealing with th is issue including; limited documentation regarding generation, handling, management, and disposal of waste. In this paper, solid waste management status in the city of Al-Abyar has been investigated through an extensive survey carried out on selected p ublic and private comp anies. Solid waste management pract...

Sorkhe-Dizaj iron oxide - apatite deposit is located within the Cenozoic Tarom volcano- plutonic belt in southeast of Zanjan, northwest Iran. The oldest units at the Sorkhe-Dizaj area are of Eocene age including trachyte, trachyandesite and andesitic tuffs intruded by quartz-monzonite, monzonite and granite plutons of Upper Eocene-Oligocene. The syn- to post-orogenic island arc magmatism and th e plutonic rocks show characteristics of I- type granites. Mineralization in the area is divided into th ree main zones (...

Zinc is a widely applicable metal and therefore the different composition and form of zinc waste is generated. The most important waste material generated in production and processing of zinc is scrap metal of zinc and its alloys, as well as slag, dust and sludge from the production and processing of cat hode zinc and zinc alloys. In terms of processing technology, there are different app lied procedures depending on the type of raw material. The processing of waste zinc a nd its alloys is pyrome tallurgical and i...

This bachelor thesis is focused on speech synthesis of Czech language in frequency domain. The resulting software solution consis ts of the analyzer and synthesizer of selected elementary speech units. Speech synthesis is based on the LPC model. The analyzer analyzes an input phoneme unit in WAV format, divides it into microsegmens of length 20 ms and keeps the LPC coefficients, flag (voiced / unvoiced) and the residual prediction error signal. These data are then stored in the XML file. Further, this thesis deals...

The paper deals with verification of the sl udge stabilization from retention tanks by using modified cellulose fibers. Verifica tion of the method was implemented through laboratory tests and field test. Laboratory te st take place in VUHU a.s. Most and field test was performed at the quarry Ji Е™Г­, Sokolov coal company, a.s. legal successor. Stabilization took place in order to allow extr action of sludge from retention reservoirs. These reservoirs are build for longer time period and must be cleaned due mainta...

Public Enterprise Elektroprivre da Srbije (EPS - Electric Power Industry of Serbia), the dominant electricity producer in Serbia, is a 100% state-owned public company. The Kolubara Mining Basin (MB Kolubara) with its open cast mines is one of 11 subsidiaries of EPS. In accordance with the Serbian Energy Strategy by 2015, one of the EPS priorities is a modernization and improvement of the efficien cy of EPS' coal mining operations at the Kolubara basin and significantly improvement the quality and uniformity of the...

This paper aims to highlight the concerns about the waste management and at the same time highlighting its regional peculiarities. Municipal waste management methods in use today are related both to the waste that are being generated and collected, as well as waste that are generated and then collected . Collected waste are waste that are being generated and then collected by the sanita tion services. Waste uncollected is waste generated but not collected by sanitation services. The methods that are used, such as ...

The paper presents research of the structure of the geomagnetic field in correlation with the neotectonic regionalization. The territo ry of the Republic of Macedonia, according to the neotectonic processes, is divided in three zones: Western - Macedonian zone which include Alpine orogeny and Pelagonian massif, Vardar zone and Eastern - Macedonian zone which is part of the old Paleozioc rock mass on the Balkan Peninsula. Anomalous geomagnetic field on the territory of the Republic of Macedonia is presented with re...

In the context of sustainable development the problem of water pollution has a greatest importance due to the necessity of ensuring a clean environment for the next generation. Water quality standards provide the framework of accepted water parameters: chemical, physical, microbiological, biochemical, radiological. The European standards show the sampling method and terminology accep ted for that in according with macro- regional environmental conditions. In the present conditions, a good standard of life for peop...

Unsustainable consumption and production pa tterns in the developed world have an increased generation of waste over many decades. One of the major environmental challenge is the enormous amount of waste generated from leather and footwear industries. The leather and footwear industr ies are diverse manufacturing sectors which employ a wide variety of materials to make products ranging from different types and styles of clothes and footwear. Over 40 di fferent materials can be used but leather represents the most ...

The paper deals with the removal of chromium from aqueous solutions based on the process of biosorption. The select ed biosorbent is the fungus of Fomitopsis pinicola . The laboratory experiments study the kinetics of the biosorption process, the effects of grain-size, activating agents, length of th e activation process and physical conditions which play an important role in the process optimization. Among the factors that influence biosorption there are, particularly, the pH value, temperature, number of revolut...

Researches of ilmenite reduction kinetics defining intensity of process course are carried out for many years. Main characteri stic is concentrate reducibility degree, characterizing process speed in concrete conditions. Ilmenite reduction process is very complicated, and its speed depends on many factors - oxides nature, temperature and degrees of concentrate grinding. Iron complicates ilmenite concentrate use in its chlorination process for obtaining titanium tetrachloride - an initial product for obtaining of s...

Tin selenide SnSe was synthesized from tin and selenium powder precursors by high- energy milling in pl anetary ball mill. X-ray diffractio n analysis confirmed that an orthorhombic tin selenide SnSe phase was formed already after 4 min of milling. 119Sn Mössbauer spectroscopy documented the values of SnSe isomer shifts corresponded to Sn in the oxidation state II. The size and morphology of tin selenide particles were studied by specific surface area measuremen ts, and transmission electron microscopy. Specific ...

The paper deals with the study on pyrite liber ation from talc raw ma terial. The material comes from deposit nearby Gemerska Poloma village (Eastern Slovakia). A lumpy material was subjected to crushing, grain si ze and float-sink analyses. Heavy and light products were also assayed. XRD study of sel ected products of float-sink analysis was carried out. Thus, it was found that iron and sulphur concentrate in a grain size classes of 0.5-3mm, above all in 1-2mm. The highest mass yield of heavy product was attained...

This paper is focused on the sulphur and su lphur forms distribution in the Antonin coal seam at Jiri and Druzba open-cast mines in the North Bohemian brown coal basin, in the Czech Republic. Briefly describes the basic geological structure of the area, deals with sulphur forms, sulphur genesis, chemism, coal sampling and analysis from the exploration boreholes. Overall 32 coal samples were precisely analyzed. The results of this analysis were used for the construc tion of the graphic outputs. Based on these resul...

Construction Sand production is done mostly by small mining companies and, because its price is distance dependent, it must be mined as near as possible to its final use, the cities, causing locational and environmental conflicts with economic and socio- environmental impacts. The Piranema Sand District is no exception. Located at 70 km from downtown Rio de Janeiro city, Brazil, its 70 small mining companies are the main suppliers of the Rio’s Metropolitan Area, w ith 90% of its demand: a critical success factor...

The existing groundwater source for the public water supply of Be čej city in Serbia tapping groundwater from three water-bearing horizons over 15 wells with summary capacity of 100 l/s. Near the public water source of Bečej exists groundwater source for industry with capacity of 12 l/s which tapped same horizons. In the coming period is planned to increase summary capacity of this groundwater source up to 57 l/s. Also, the increase of summary city’s s ource capacity is planned for 50 % in the next few years, ...

The paper presents some results of research and development, obtained by the institute and its partners, to promoting advanced technologies and equipment for wood waste recycling, in order to obtain the ecological compost used for developing a sustainable and ecological agriculture. At the beginning, there is presented mobile wood chipper equipment, for fragmentation and shredding of wood branch es resulting from activities of grooming / trimming of trees and shrubs in agricultural areas, orchards and forestry. In...

Well organized ventilation systems and air distributions of the school buildings in many countries still appear to be a t opical issue. A lot of various investigations indicated that IAQ problems appear not only because of low ventilation ra tes, but also in cases when the location of exhausted and mainly supply jets is not appropriate. The main motivation is the select of most efficiency air ve ntilation systems and di stribution schemes to improve IAQ for school buildings. The model of university classroom for p...

The paper deals with some factors influencin g the values of sandy soils shear strength parameters, obtained by direct shear test (DST). Influences of density, shear area changing and number of specimens on the test result of clayey sand (SC) and sand with some fines (S-F) are examined. Influences of the density on the values of sandy soils shear strength parameters will be introduced in the paper by the tests with density index 6 . 0 ; 3 . 0=DI and 0.9. Influences of the shear area changing on the values of sandy...

The northeaster part of the Czech Republic is since the early 19th century associated with underground coal mining. This activity brings economic benefit in addition to changes in the landscape – soil depression followed by habitat destruction. Flooded mine subsidences are an example of such degradation of native plant and animal communities, biodiversity dec line and wetland and aquatic ecosystems establishment. For a long time, these ecosystems were considered worthless and unproductive [10]. The aim of the va...

The biotechnological methods have wide application area in the remediation of heavy metals from the waste waters. This study presents the results of the biological-chemical activation of coal waste from the Cigel deposit (Slovakia) by selected species of microorganisms, as well as: Aspergillus niger, Asperg illus clavatus, Penicillium glabrum and Trichoderma viride . The quantitative maceral composition has been investigated. The complex maceral analysis shoved that microorganisms preferentially disrupt the struct...

This item refers to the cent re-peripherical model due to Paul Krugman (1991) with all its merits in grounding of the economic crowdings, and which at the same time meant also the arising of a new field in the economic theory, known as “The New Economic Geography”. They also criticized it for the symmetry of the transport costs of the industrial and agricultural products. These criticisms could be avoid by improving the model, so as it is trying in this work. Simultaneously, the achieving of an informatics pro...

Although the buildings of the Universidad de Concepcion (UdeC) stood up well structurally to the effects of the 8.8 magnitude earthquake on 27 February 2010 in Concepcion, Chile, diverse damage was generated in their non-structural elements. Due to the large number of university buildings (over 100 on the Concepcion Campus alone) and the need to start classes on 5 April, numerous simultaneous repair projects were generated. These were done within the national post-earthquake context, UdeC culture and timing. The o...

The work deals with reconstruction of family house on the part of energy for heating need. The essence has been to comparise individual alternatives, which are possible to realise in judge house. In the first part of work is the attention devoted to object describing and to heat loses values before and after the measurements. Than are particularly characterized alternatives of heating, their annual costs for heat production and for amount of fuel, invested costs and the portion of invested and overall costs. In th...

A crisis is referred to an unplanned event emerging from the internal or external environment of an organization, region, or country which can disrupt operations, threaten people physically and mentally, Crises often have negative consequences including a decrease in demand and revenues, rising costs, the deterioration of normal conditions. Meanwhile, some of them may also offe r some opportunities for companies. It had both negative and positive impacts although its benefits were often overlooked. But it becomes ...

The aim of this paper is to discuss the correlation betw een students’ creativity and students’ performance at vocational studies. The research seeks to define educational performance by considering multidimensional nature of creativity. This research aimed at exploring the re lationship between self-esteem and academic performance by using creativity inventory. To this end, a research has been conducted on the students of vocational studies (n=312 ) in Istanbul. According to the results, a weak relationship (...

This publication presents th e assessment studies of two important characteristics, limiting the utilization of the geological envi ronment for various pu rposes, especially construction. The first is the character of the pre-quaternary bedrock, other is the rock workability. Character of the pre-quaternar y bedrock and its depth is important primarily for the complex foundation engineering. They carry the greater load caused by the weight of the structure itself. Therefore, it is often necessary to carry the weig...

The paper presents a solution for developing the water body in an enclosure arranged with engineering works from the Danube meadow in Giurgiu county. The solution is applicable in the conditions of a half captive aquifer taken from the Danube Specific for this solution is the type of hydric excess with a higher intensity and duration than on the border zones. The experimental field has a surface of 4 ha a nd is located in conditions of alluvial soil with a clad texture. The arrangement has abso rbing pipes placed ...

The environmental protection expenditures have started to play a significant role in the Romanian economic development policy only since the 1990s, both in enterprises and public authorities. The objective of EU accession has led Romanian policymakers and managers to give up the idea that investme nt in environmental protection should be postponed until the economic growth can provide financial resources needed to solve the environmental problems. In ternational studies have also shown that the economic growth exp...

The local rural communities of Romania have been strongly affected by the historian evolution in former decades by social- economic system evolution. To these ones, there have been added a period of almost fifty years of a social system based on centralized economy and, afterwards, Romanian economy was and is marked by the period of transition towards the market economy. All of these periods determined a peculiar social - economic relationship and, in fact, be haviors of the rural inhabitants, as ones between the ...

A comprehensive review of published books and articles shows that discontinuities, especially joints within coal-bearing depos its are important features that must be considered during mine planning and desi gn. Less attention has been paid to orientations of joint sets and other disc ontinuities relative to mining face in proposed rock mass classification systems. In fact the structural competence of mine roof rock is determined primarily by the discontinuities that weaken the rock fabric. In this paper the effec...

Gold is a precious metal extracted and used since ancient times. The present paper analyzes the properties and characteristics of gold in terms of physical-mechanical properties and the process of its extraction from ore. After extraction of tons of low grade gol d ore using sodium cyanide (NaCN) are obtained two grams of gold and there are left mining waste dumps containing 25-50% gold. The technological process of cyanide not only shows a low efficiency of extraction, but it also brings great risks in terms of e...

Through benchmarking one can get informati on about the performing practices in the field of environmental policies, thus being able to try to reach its level of performance. But the national context requires the finding of self means of achieving the performance and performing practices. The environmen tal policies benchmarking has long term effects and stimulates the learning in concerned entities. The aim is to create sustainable prosperity. It requires common goals and use of all actors involved in the change ...

The purpose of this study is to present an application of the Static and Dynamic Rock Durability Indicators in order to estimate durability and weathered state of rock material used in the engineering structure. Durability of rocks can be defined as the rock’s ability to resist degradation during its working life. No one engineering test can be used as an absolute predictor of performance of building stone in service. Therefore a variety of approaches have been developed to estimat e of the durability of buildin...

The evaluation of the environmental policy it relies on the quantification processes of the expected and / or achieved, as well as of the report between the efforts and the effects achieved. If the evaluation of the effort s and / or of the effects is objectively or subjectively distorted, the ev aluation process becomes a me re formality, with negative consequences for all actors involved in policy. Thus, any successful monitoring requires prior specification of what must be a prog ram providing: deviations from ...

Trepça mine in Stantërg during its activities of exploitation periods divides this process in three stages of exploitati on, where in the first stage there are old exploitations of levels from 830m and 610m, and the way of exploitation method, dimensions of backbones and securing plates has been change d as a result of determination of height of floor-horizons between them. The heights of 30m and the angle of small fall allows this method of exploitation to be more favourable and secure. Securing backbones, are ...

The territory of Kosovo, in particular of Dukagjini through the valley of the Drini i BardhГ« River is under the influence of the modified Mediterranean climate. This influence climate has enabled the growth of Mediterranean and Sub Mediterranean plants which became part the species Ficus carica L. ( Fig). In the current research to Ficus carica L. ( Fig) in Kosovo was known only as cultivated plant. In this paper, we are presenting the species Ficus carica L. (Fig), which represent new naturalized-native plant sp...

The widespread use of various types of ro cks in construction, construction materials industry and in raw material production implicitly requires a detailed knowledge of their geo-mechanical characteristics. The use of ro cks in the execution of various works is only allowed if they fall within certain quality criteria. With in this context, in the Geo- Mechanics Laboratory from the University of Petro Еџani, a complete assessment of the geo-mechanical properties of rocks from S outhern VГўlcan Massif was carried ...

The surveyed area is located at the north of the Chamchamal city, Kurdistan region in the north of Iraq. Through this survey, the area has received its first potential geophysical prospective by gravity and magnetic methods. The geophysical survey based on 401 gravity and magnetic points. Th ese points distributed over eight profiles (four profiles for each method),along strike and dip directions. The gravity data has been corrected for several corrections to find out the Bouguer anomaly and the magnetic data is c...

For the analysis of various geological featur es can be derived from minimal anomalies caused by mass distributions, we present an ex tensive geophysical re cords. It is quite clear that at this stage; on ly a comprehensive analysis of data submitted by the various branches of geology can advance our knowle dge on geological structure and causes for it. Classical correlation between gravity anomalies of sedimentary basins of major minimum and is the most common significant abnormalities that may be of this type.

Mining bodies that lay in the depth of Earth’ s core always appear as irregular bodies in different geological- mining circumstances. Mine “Trepça” in Stanterg since the beginning of its work in 1930 up to now has applied several exploitation methods of mining bodies, and one of these methods is the so called Frontal Method. This method is applied in cases when the ore body has small sizes in length from 30m and the fall angle up to 30º. During the app lication of this method, the securing backbones have b...

The increase of the demands for quality in th e EU is caused by the fact that customer’s satisfaction is no longer enough; the expectations must be overcome by promoting the concept “Beyond Customer Satisfaction”, which determined the orientation of the Romanian companies toward s implementing the Quality Management System. This paper aims at analysing the impact that th is implementation system has on the analysed company's financial and economic results involv ed in such a process. This diagnosis, during 2...

The competitiveness of economy both at the na tional and regional levels needs to be perceived in close context with the principle of sustainable development because competitiveness an d sustainability are not mutually exclusive. The concept of sustainable development encompasses three pillars: economic, social and environmental. If we are to analyse these th ree dimensions of sustainable development, there shall be suitable indicator s available that would be capable of expressing mutual relationships between eco...

The purpose of this publication is to evaluate the geological environment for its suitability, respective unsuitability for foundation engineering. The means to realisation this objective was the study about extension of the engineering-geological zones on a map sheet 15-44-08 in studied area. This is an area municipalities in the Doly, Spa Darkov, Stonava and Horni Sucha. It is a mining area in the northeastern part of the Czech Republic. There were detected the speci es of the engineering-geological zones, the l...