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Access to cheap sources of energy has been a foundation of economic development of the modern world. High rates of GDP growth affect the dynamic development of civilization and, inter alia, make technological progress possible due to the increase in global energy consumption. Energy costs and energy availability also have a significant impact on the economic competitiveness of particular countries and regions of the world. Dynamic world economic development, population growth and the widespread use of energy in ev...

In recent years, the global economy has become increasingly interested in obtaining energy from renewable sources. This trend is mainly due to the necessity of reducing the negative environmental impact of conventional sources of energy. One of the leaders in making this change is the European Union. Energy policies and electrical systems of EU Member States are increasingly dependent on the development of renewable energy. This also translates to the energy policy of Poland as a member of the EU. In the coming ye...

One of the main factors determining economic and social development of particular countries is availability of cheap energy source. In a case of European countries, this availability has also important influence on the integration process. Amount of produced energy in given country tells about the level of its civilizing development. Also so-called energy independence that most countries are aimed and which guarantees political independence is strictly related to this problem. It can be assumed, that energy is one...

The production of electricity and heat is inextricably linked to the emission of gases, dust and other substances harmful to the environment. The size of this issue depends on many factors. The most important ones are: the type of fuel used in the production of energy, the type and age of generating installations, the technology used and the type and effectiveness of purification systems. The basic problem of power industry is the need to generate the right amount of energy needed for economic development, while a...

One of the fundamental problems in coal mining industry is inefficient use of machinery and equipment. It is therefore necessary to take measures to improve the situation. An innovative system to test components of mining machinery control hydraulics presented in the article may support the initiative. This system enables reliable and efficient testing of components of the control hydraulics. This has an essential and practical significance, since hydraulic systems are commonly applied by many industries, in parti...

Increasing competition in the domestic and global markets causes companies to be more and more active in taking steps to obtain an advantage over competitors. The area, which is particularly important in building this advantage, is knowledge. Knowledge is the basic resource for every company, which if used properly, ensures development, growth and economic success. It very often happens that the companies are not fully aware of the knowledge potential they possess. Therefore, it is justified to take activities tha...

The modeling of eddy currents in ferromagnetic materials is impossible without information about magnetic field induction dependence of it intensity (magnetization curve). Experimental definition of magnetization curves related to technical difficulties. As a rule, reference information of that curves contains a small amount of knowledge and not applicable for direct application. In this regard the transition from original magnetization curve to its approximation is relevant. The purpose of a research is in the ch...

The purpose of this work was to study specific features of the accumulation and distribution of the total content and mobile forms of heavy metals (HM) in soils and plants of the estuarine ecosystems of the Don river and the Taganrog bay coast (Russian Federation). The soil cover is represented by following soils types: Fluvisols, Haplic Chernozem, Arenosol, Solonchak. The following higher plants were sampled: Phragmites australis Cav., Typha angustifolia L., Carex riparia Curtis, Cichorium intybus L., Bolboschoen...

A very important factor, which has a great influence on the financial situation of mining enterprises extracting coal, is an effective use of machines. To determine the level of the use of the machines, it is necessary to reliably evaluate their work. The credibility of such evaluation mainly depends on the quality and the amount of obtained data about the parameters of the machines? work. To synchronize, archive and analytically process the data, it is essential to use appropriate informatics tools. The article p...

The article describes the chosen Japanese production and maintenance management philosophies, such as Lean Management, kazien and TPM. Japanese approaches to the process of work organizing and work planning, workplace preparing, tasks, duties and responsibilities turn out to be the most effective and the most efficient in the world. The practical application of these philosophies entails achieving the measurable benefits by the companies that use them. The basis of these philosophies is the elimination of all kind...

Gas flow through porous media is a physical phenomenon commonly occurring in natural environment and in many industrial applications. This phenomenon is most often connect with filtration process and migration of gases through different porous structures, mainly rock media. In these medium there occur free spaces of different shapes, in which flow of gas is possible. These spaces create pores (for which longitudinal dimension and transverse dimensions are similar) and gaps (for which transverse dimension is consid...

Conditions of the microclimate prevailing in mine workings are one of the most important factors influencing on the comfort and safety of the working mine crews. This climate depends on parameters of the ventilated air stream and conditions prevailing in these workings. Parameters having the most important influence on the conditions of microclimate are temperature of the air and rock mass, humidity, velocity of air stream and average temperature of radiation of wall surface of the working. Nowadays, due to the la...

One of the commonly present gas hazard in hard coal mines methane hazard. The most endangered region by this hazard, during ventilation of longwall in ?U from boundaries? system is the crossing with ventilation roadway (so called ?upper corner of longwall?). Accumulation of methane in this place results from its release from goaf. Therefore, in order to decrease methane concentration in this region, auxiliary ventilation devices are used. They are aimed to supply to this place such an amount of fresh air, as to di...

One of the most significant elements of every machine operation is its control system. Proper design, construction and operation of the control system is the key factor for correct and efficient operation of a machine. This particularly applies to mining machinery operating in hazardous environments and exposed to loads which cannot be fully predicted. Such machines must be therefore characterized by high reliability, durability, readiness and safety. In order to fulfil all these requirements, a machine must be eq...

Underground mining operations are inextricably linked to negative impact on the environment. This impact, in particular, may result in the formation of mining damages (various types of terrain deformation) and pollution of the environment. It can also results in long-lasting changes in the landscape and environment. Sustainable management of areas degraded by mining exploitation requires an accurate stocktaking. Authors of this article presented the example of usage of GIS technology to develop a model of supporti...