The Upper Silesian Coal Basin is one of the most active mining areas in the world in respect of seismicity. Underground mining in this area takes place in a special environment with a high degree of risk of unpredicta...The Upper Silesian Coal Basin is one of the most active mining areas in the world in respect of seismicity. Underground mining in this area takes place in a special environment with a high degree of risk of unpredictable event occurrence. Especially dangerous are phenomena that occur during the extraction of deposits at great depths in the environment of compact rocks. Deep underground mining violates the balance of these rocks and induces dynamic phenomena at the longwall life （in terms of distance） referred to as mine tremors. The sources of these tremors are located in layers characterised by high strength, especially in thick sandstone strata occurring in the roof of the mined seam. In the paper a discussion is presented about the influence of mining intensity （longwall face speed） on the location of mine tremor sources, both in the direction of longwall life （in terms of distance） and towards the surface. The presented material has been prepared basing on the results of tests and measurements carded out at the Central Mining Institute.展开更多
Men and women participate in many social activities through professional roles.The main content of this study is the occupation development gender equality,which is a recessive change of quantity.Therefore,we cannot c...Men and women participate in many social activities through professional roles.The main content of this study is the occupation development gender equality,which is a recessive change of quantity.Therefore,we cannot concretely measure it to some extent,but through the structure square distance model and employees' feeling about the process,we can reflect its difference.The results of studying the feelings of male and female employees show that the gender equality is a problem,and there is a difference for men and women in career development.展开更多
文摘The Upper Silesian Coal Basin is one of the most active mining areas in the world in respect of seismicity. Underground mining in this area takes place in a special environment with a high degree of risk of unpredictable event occurrence. Especially dangerous are phenomena that occur during the extraction of deposits at great depths in the environment of compact rocks. Deep underground mining violates the balance of these rocks and induces dynamic phenomena at the longwall life （in terms of distance） referred to as mine tremors. The sources of these tremors are located in layers characterised by high strength, especially in thick sandstone strata occurring in the roof of the mined seam. In the paper a discussion is presented about the influence of mining intensity （longwall face speed） on the location of mine tremor sources, both in the direction of longwall life （in terms of distance） and towards the surface. The presented material has been prepared basing on the results of tests and measurements carded out at the Central Mining Institute.
文摘Men and women participate in many social activities through professional roles.The main content of this study is the occupation development gender equality,which is a recessive change of quantity.Therefore,we cannot concretely measure it to some extent,but through the structure square distance model and employees' feeling about the process,we can reflect its difference.The results of studying the feelings of male and female employees show that the gender equality is a problem,and there is a difference for men and women in career development.
