Abstract: Methods and systems are described for providing end-to-end beamforming. For example, end-to-end beamforming systems include end-to-end relays and ground networks to provide communications to user terminals located in user beam coverage areas. The ground segment can include geographically distributed access nodes and a central processing system. Return uplink signals, transmitted from the user terminals, have multipath induced by a plurality of receive/transmit signal paths in the end to end relay and are relayed to the ground network. The ground network, using beamformers, recovers user data streams transmitted by the user terminals from return downlink signals. The ground network, using beamformers generates forward uplink signals from appropriately weighted combinations of user data streams that, after relay by the end-end-end relay, produce forward downlink signals that combine to form user beams.

Abstract: An access control mechanism for granting, revoking, and denying authorization to computer system objects using a customer supplied set of verbs, parameters, attributes, and functions. The access control mechanism employs a processor for providing access controls to objects comprising subject memory, verb memory, object memory, definition memory, rule memory and an evaluator. The processor may be embodied as a microprocessor and memory, or a computer using software. The subject memory stores specified user attributes in a matrix having information for each user on each row, with user attributes in each field. The object memory stores object names, object attributes, and rules for defined verb names. The definition memory stores field definitions, external function declarations and strings. The rule memory stores rule names with their associated boolean expressions.

Abstract: Method and apparatus for mixing a carrier gas with a foundry aggregate resin catalyst fluid in which the liquid catalyst fluid is vaporized to a gaseous state and is thereafter mixed with the carrier gas. A proper proportion between the two gases is established by the setting of variable valves which control the flow of the two gases. The setting of the variable valve for the carrier gas establishes a flow rate for that gas at a given load level. The variable valve for the other gas is then set to establish a flow rate for the other gas with the desired proportion between the flow rates of said gases at said given load level. When the gas mixture is drawn upon at said given load level or at reduced load levels, the valves retain their initial relative settings and maintain the desired proportion, regardless of load level.