Abstract: In a direct drill bit drive for tools for comminuting brittle materials and penetrating into brittle materials by percussive impact on the basis of a heat engine operated with a gaseous working medium, the heat engine is a hot gas engine operating in accordance with a real Stirling cycle process.

Abstract: In a direct drill bit drive for tools for comminuting brittle materials and penetrating into brittle materials by percussive impact on the basis of a heat engine operated with a gaseous working medium, the heat engine is a hot gas engine operating in accordance with a real Stirling cycle process.

Abstract: The invention provides a method of reversibly storing hydrogen at industrially practicable temperature and pressure conditions. A stable hydrogen storage hydride is mixed with a destabilizing hydride. The stable hydride is capable of releasing hydrogen at a first energy level. When the stable hydride is in the presence of the destabilizing hydride, the stable hydride releases hydrogen at a second energy level. The second energy level is significantly reduced from the first energy level.

Abstract: The invention provides compositions for reversible storage of hydrogen at industrially practicable temperature and pressure conditions. Hydrogen storage material systems comprising stable hydrides and destabilizing hydrides. When the stable hydride is in the presence of the destabilizing hydride, the stable hydride releases hydrogen at a lower energy level than it would in the absence of the destabilizing hydride.

Abstract: A device for storing compressed gas includes a cylindrical pressure vessel having inlet and outlet conduits for a cooling/heating fluid and for compressed gas. Arranged in the interior of the pressure vessel are plural storage layers which are separated from one another and contain solid matter for charging with compressed gas. The storage layers have a volume, which depends on a charging state of the storage layers with compressed gas, and are separated dust-tight from one another about their circumference. Bounding one side of each storage layer is a spring layer which assumes a filtering function with respect to the solid matter of the storage layer, wherein the solid matter in the storage layer is charged with compressed gas via the spring layer or compressed gas is discharged from the solid matter in the storage layers via the spring layer. The other opposite side of the storage layer is bounded by a gastight cooling/heating layer for passage of the cooling/heating fluid.

Abstract: The invention provides compositions for reversible storage of hydrogen at industrially practicable temperature and pressure conditions. Hydrogen storage material systems comprising stable hydrides and destabilizing hydrides. When the stable hydride is in the presence of the destabilizing hydride, the stable hydride releases hydrogen at a lower energy level than it would in the absence of the destabilizing hydride.

Abstract: The invention provides a method of reversibly storing hydrogen at industrially practicable temperature and pressure conditions. A stable hydrogen storage hydride is mixed with a destabilizing hydride. The stable hydride is capable of releasing hydrogen at a first energy level. When the stable hydride is in the presence of the destabilizing hydride, the stable hydride releases hydrogen at a second energy level. The second energy level is significantly reduced from the first energy level.

Abstract: In one aspect, the present invention provides a system for methods of producing and releasing hydrogen from hydrogen storage compositions having a hydrogenated state and a dehydrogenated state. In the hydrogenated state, such a composition comprises a hydride and a hydroxide. In a dehydrogenated state, the composition comprises an oxide. A first reaction is conducted between a portion of the hydride and water to generate heat sufficient to cause a second hydrogen production reaction between a remaining portion of the hydride and the hydroxide.

Abstract: In one aspect, the invention provides a hydrogen storage composition having a hydrogenated state and a dehydrogenated state. In the hydrogenated state, such composition comprises a hydride and a hydroxide. In a dehydrogenated state, the composition comprises an oxide. The present invention also provides methods of and compositions for regenerating a species of a hydroxide and a hydride material.

Abstract: In one aspect, the invention provides a hydrogen storage composition having a hydrogenated state and a dehydrogenated state. In the hydrogenated state, such composition comprises a hydride and a hydroxide. In a dehydrogenated state, the composition comprises an oxide. The present invention also provides methods of producing hydrogen, including for mobile fuel cell device applications.