Abstract: A method to improve a performance and efficiency of a liquid-gas eductor includes injecting a small amount of secondary gas into the primary motive liquid prior to the latter's arrival at the eductor. This measure simultaneously reduces the flow rate of motive fluid and maintains a level of secondary inducted flow such that the aggregate secondary flow is higher than without the intervention—for certain conditions. The additional work needed in introducing the injected secondary fluid, by auxiliary means, is a few percentage points of the work done by the motive fluid without the intervention. The quantity of secondary fluid inducted and injected by the eductor adopting the above measures approaches double than that of the secondary flow without the measure. The motive liquid volumetric flow rate is reduced slightly which with the enhanced aggregate secondary flow means that the energy efficiency of the eductor process is substantially increased.

Abstract: A system for concentrating gas, using the concentrated gas to pump liquid, and recycling the gas and liquid is disclosed. The system comprises a body of liquid, a down pipe in fluid communication with the body of liquid, a gas injection apparatus for introducing gas into the liquid that passes through the down pipe, a separator for separating compressed gas from the liquid, and a gas-liquid recycle loop. The down pipe and the gas injection apparatus are structured and arranged to compress the gas. The gas-liquid recycle loop comprises a compressed gas storage vessel containing the separated gas, a reservoir containing liquid separated from the compressed gas, and a gas-liquid pump. The gas-liquid pump has a gas inlet in communication with the gas storage vessel, and a fluid inlet in communication with the reservoir. The gas-liquid pump is structured and arranged for pumping the liquid back to the body of liquid and delivering the gas to the gas injection apparatus.

Abstract: A method of producing steel armor plate having improved resistance to penetration by projectiles. The armor plate provides for intended inclusions, generally elliptically shaped, in the steel oriented substantially parallel to the plate surface. Those inclusions result from at least one element of the steel composition selected from the group of sulfur and oxygen. The steel armor plate may be useful with an increased inclusion level on the front approximately one-half portion of the dual hardness composite steel armor plate so as to spread out the force of the impact over a wider area.