1 1 The Mining Engineering Institute of Siberia LLC, Kemerovo, 653066, Russian Federation Authors’ Information Uvakin S.V., Chief project engineer, e-mail: s.uvakin@sds-ugol.ru Abstract The paper discusses the results of modal analysis of the hydraulic jack. <...> Keywords Hydraulic jack, Powered roof supports, Modal analysis, Natural frequency, Static analysis. <...> Raschet kolebanii krovli pri vtorichnykh osadkakh [Calculation of fluctuations of a roof at secondary rainfall]. <...> O forme dinamicheskikh kolebanii bloka krovli pri reaktsii krepi v vide sosredotochennoi sily [About a form of dynamic fluctuations of the block of a roof at reaction fix in the form of the concentrated force]. <...> Perspektivy innovatsionnogo razvitiya ugol’nykh regionov Rossii [Prospects of innovative development of coal regions of Russia]. <...> O dinamicheskikh kolebaniyakh bloka krovli pri reaktsii krepi v vide raspredelennoi nagruzki [About dynamic fluctuations of the block of a roof at reaction fix in the form of the distributed loading]. <...> Collection of works of XVI International scientific and practical conference, October 7-10, 2014, Kemerovo, Siberian Branch of the Russian Academy of Science, KEMNTS of the Siberian Branch of the Russian Academy of Science, Institute Coal of the Siberian Branch of the Russian Academy of Science, KuzSTU, KVK “Expo Siberia” LLC, 2014, (CD– ROM), ISBN 978-5-902305-42-2, pp. <...> Пресс-служба АО ХК «СДС-Уголь» информирует На шахте «Листвяжная» приступили к перемонтажам в двух очистных забоях На шахте «Литсвяжная» приступили к плановым перемонтажам механизированых очистных комплексов в новые забои, завершив отработку запасов лав № 1105 пласта Сычевский IV и лавы № 1315 пласта Грамотеинский II. <...> За 5 мес. с начала года горняки предприятия добыли 2 млн <...>