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The proportional-integral-differential (PID) law is often used to control the induction heating process. Mathematical modeling of induction heating in a three-dimensional formulation is associated with high costs of machine time to solve the electromagnetic field equations. The need to recalculate the heat dissipation field due to changing the power of the inductors at a small sampling period of PID controller leads to an excessive amount of calculations. Two methods of calculation of temperature fields of inducti...

In recent years, the packaging market has become an important element of the economy of many countries. Its growing importance is associated with rapid industrial development, globalization, free transfer of goods and growing demand from consumers. Customer requirements affect the growing demand for more functional, colorful, light, flexible, ecological and environmentally safe packaging. Currently, the packaging has become an element that in many cases determines the demand for a given product. In particular, thi...

Underground hard coal exploitation is accompanied by a series of natural hazards. Their number and intensity increase along with the growing depth of exploitation. Amongst the most dangerous hazards in the mining industry, one can distinguish the following: methane hazards, seismic hazards (including the rock-burst hazard) and coal dust explosion hazards. They are a common issue in Polish coal mines, thereby making it necessary for coal mines to identify the level of these hazards. It can also be assumed that ther...

One of the most important issues of the global economy including the European one is the problem of environmental pollution from the by-products of industrial activity. The development of energy, metallurgy, electro-machine and other industries makes the environment more and more contaminated and degraded. This process covers virtually all spheres of the natural environment which are the lithosphere, atmosphere, hydrosphere and biosphere. The contamination of the atmosphere is particularly dangerous because it adv...

The uncertainty of methods for determining the heavy metal compounds, as well as problems in the comparison of the methods used, require further studies in this field. The aim of research is to study the fractional composition of Cu and Zn compounds in soil under model contamination conditions using different fractional methods. Chernozem Haplic was artificially contaminated with Cu and Zn acetates at rate of 300 mg kg ?1. Distribution of Cu forms in soil at the use of sequential fractionation by the Miller method...

Monitoring soil contamination with heavy metals is challenging because of the large areas of contaminated soil and the high cost of laboratory tests. For these reasons new measurement methods of metal concentration in soil based on the Fourier Transform Infrared Spectroscopy (FTIR) were tested. These methods include measurements made mainly in the near infrared region (NIR). Moreover the field implementation of these methods is considered. Previous results presented in the literature are not consistent and do not ...

The machines used in hard coal mining must exhibit very good technical, safety and reliability parameters. These parameters determine their efficiency, operational safety and effectiveness of the entire production process. The last several decades have seen increased mechanisation of the mining process. Increasingly more cutting-edge and efficient machines have been used for this purpose. Attempts have also been made to partially or fully automate the process of mining. The concept of an ?intelligent? mine has com...