The integrated study of coal is performed using methods of optical and electron paramagnetic resonances, infrared spectroscopy and Raman spectroscopy. It is found that gas content of coal is governed ...by the rank of coal and its material constitution as well as by the coal bed structure at the macro-, micro- and nano-levels which interwork. It is discovered that the size and amount of bubbles, of paleo-origin presumably, and the content of coalbed methane are related. The influence of each scale level of the coal bed structure on the gas content is revealed. The authors illustrate benefits of the integrated study of gasbearing coal with the physical methods that complement one the other at different levels of coal structure.
We propose a method for the determination of effective (mean) velocities and attenuation coefficients of elastic waves in a medium with two ensembles of distributed disc-shaped compliant and ...low-contrast inclusions. The inclusions are characterized by both their own ensemble volume concentrations and ordered (or random) space orientations. The realization of this method is connected with the application of the Foldy dispersion relation with the use of the solutions of problems of scattering of elastic waved by local inhomogeneities. We also perform the numerical analysis of the influence of volume concentrations of various types of inclusions and the wave number on the effective velocity of elastic longitudinal waves.
Erratum to: Publisher’s Erratum Adushkin, V. V.; Kishkina, S. B.; Kulikov, V. I. ...
Journal of mining science,
2017/9, Letnik:
53, Številka:
5
Journal Article
Recenzirano
Odprti dostop
Due to a technical error volume 53, issue 4, 2017 has been published online with an incorrect cover data. The issue has erroneously been distributed with the cover date July 2018. The correct caver ...date for volume 53, issue 4 should be July 2017.
Optimisation of SDW gathering process by decreasing expenses, sorting of waste with simultaneous improvement of an environmental state, is one of conditions of effective waste management system. The ...author offers the universal model allowing to use different variants of initial and limiting parametres of separate SDW gathering in the conditions of the modern market.
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