A server rack assembly includes a rack, a chassis, and a locking device. The invention also relates to a method for making abrasive grains based on alumina consisting in melting alumina, casting it at a constant flow rate less than 80 kgmn, and cooling it by dispersing the melted alumina in fine droplets to obtain articles with size less than 1 mm. The injection nozzle, centrally-located in the fire deck of the cylinder head, includes a central pintle discharging fuel on the cylinder’s centerline; and a plurality of small auxiliary orifices circularly surrounding the central pintle; discharging at a radial angle to the cylinder’s centerline. The currently loaded hardware protection key set specifies those page key numbers that are currently accessible to the processing unit for the execution context. The organic electroluminescent device includes a emission layer formed by doping a phosphorescence material on a host material expressed by the following chemical formula: where R is any one selected from a group consisting of H, an alkyl group, an aryl group, and halogen. A method of preparing solid beads is also provided.