نتایج جستجو برای: difficult geological conditions
تعداد نتایج: 1087328 فیلتر نتایج به سال:
Abstract The powered roof support is one of the essential elements technical equipment longwall. It responsible for safety machines and workers. In addition, its function to move entire wall complex along operational progress combine. Choosing proper per conditions prevailing in an important factor safe effective operation. aim study was assess mining geological Polish hard coal mines terms ope...
Fire is a worldwide phenomenon that appears in the geological record soon after the appearance of terrestrial plants. Fire influences global ecosystem patterns and processes, including vegetation distribution and structure, the carbon cycle, and climate. Although humans and fire have always coexisted, our capacity to manage fire remains imperfect and may become more difficult in the future as c...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید