Abstract: This disclosure relates generally to an apparatus for organizing battery cells. The apparatus includes a block including: sleeves forming chambers, a first sheet configured to locate the sleeves, and a foam structure surrounding the sleeves. Each chamber is configured to accommodate a battery cell. The block is configured to: organize the battery cells into battery cell groups, separate each battery cell group from its adjacent battery cell groups using a thermally insulating material, and prevent gas from entering into each battery cell group from its adjacent battery cell groups. Each battery cell group includes a plurality of the battery cells, each of the battery cells in the battery cell group is adjacent to at least another of the battery cells in the battery cell group. Each battery cell group is adjacent to at least another battery cell group.

Abstract: A method of operating an internal combustion engine with gaseous fuel includes providing fuel to a plurality of cylinders with both central point injection and multipoint injection. Central point injection, which provides good air/fuel mixing, may provide a majority of steady-state fueling, and multipoint injection is used for supplementing the central point injection during steady-state and for providing rapid transient response to load changes.

Abstract: A method of operating an internal combustion engine with gaseous fuel includes providing fuel to a plurality of cylinders with both central point injection and multipoint injection. Central point injection, which provides good air/fuel mixing, may provide a majority of steady-state fueling, and multipoint injection is used for supplementing the central point injection during steady-state and for providing rapid transient response to load changes.

Abstract: An acoustic dampening panel comprising: (a) a first layer of expanded polypropylene; (b) a solid layer having a surface weight between 2.4 kilograms per meter squared and 25 kilograms per meter squared; and, (c) a second layer of expanded polypropylene, where the first and second layers of expanded polypropylene sandwich the solid layer therebetween. The acoustic dampening panel may further comprise a fourth layer comprising a metal skin, where the solid layer and the metal skin sandwich the second layer therebetween.

Abstract: An acoustic dampening panel comprising: (a) a first layer of expanded polypropylene; (b) a solid layer having a surface weight between 2.4 kilograms per meter squared and 25 kilograms per meter squared; and, (c) a second layer of expanded polypropylene, where the first and second layers of expanded polypropylene sandwich the solid layer therebetween. The acoustic dampening panel may further comprise a fourth layer comprising a metal skin, where the solid layer and the metal skin sandwich the second layer therebetween.