The disclosure concerns an antenna subsystem that can be used in various repeater systems to optimize gain of the repeater by increasing isolation between donor and server antennas, wherein at least one of the donor and server antennas is an active multi-mode antenna.

A blast aerator (20) having a discharge end (23) connected internally to a rigid output tube (24) includes a removable aerator control module (15) that internally, sealingly interacts with the output tube (24). A tank discharge pipe (28) directs air blasts into an external application. The aerator control module (15) comprises an external actuator (30) with a trigger valve (85) that controls a reciprocating plunger assembly (50) that interacts with an internal plunger seat (77) to block or unblock air discharge. A plunger seat adaptor assembly (70) fitted to the aerator output tube (24) comprises a resilient plunger seat (77), that is blocked or unblocked by a plunger element (52) reciprocating within a cage (73), being controlled by a slidable piston (38) that is pneumatically displaceable between tank-filling and tank discharge positions within the actuator (30). The plunger seat adaptor assembly (70) mechanically compensates for output tube misalignment to insure proper sealing. Operational air pathways pneumatically control piston movements without springs.

A pulverized-fuel supply unit includes a hopper, first nozzles, second nozzles, a pressurizing-gas supply device, a fluidization-gas supply device, and a pulverized-fuel supply line. The hopper has a hollow to store therein pulverized fuel. The first nozzles are provided to the hopper. The second nozzles are provided to a vertically lower part of the hopper below the plurality of first nozzles. The pressurizing-gas supply device is configured to supply pressurizing gas to increase internal pressure of the hopper. The fluidization-gas supply device is configured to supply fluidization gas to fluidize the pulverized fuel in the hopper. The pulverized-fuel supply line is provided to a vertically lower part of the hopper. The pressurizing-gas supply device supplies pressurizing gas to the first nozzles and the second nozzles. The fluidization-gas supply device supplies fluidization gas to the second nozzles.

A method is disclosed for storing and moving proppant. A supply of fracking proppant is provided at a remote location. A plurality of containers are provided to the desired location, each container having a top, a plurality of walls extending from the top and terminating at an outlet for discharge of proppant therefrom and a flow gate positioned adjacent the outlet to control flow of proppant from an interior volume of the container through the outlet. The plurality of containers are filled with fracking proppant at the remote location, then transported from the remote location to a well site location. The plurality of containers are staged at the well site location and the amount of proppant on hand at the well site location is tracked.

An apparatus for distributing gases and, optionally, liquids into a control valve includes a collar and a plurality of gas distribution devices. The collar includes a first side, a second side opposite the first side, an inner bore formed through a central portion of the first side and the second side, an outer edge positioned between the first side and the second side and which defines an outer perimeter of the collar, an inner edge positioned between the first side and the second side and which extends around the inner bore to define an inside perimeter of the collar, and a plurality of passages that extend through the outer edge and inner edge without penetrating the first and second sides. The plurality of gas distribution devices are mounted into the passages of the collar.

A blast aerator (20) having a discharge end (23) connected internally to a rigid output tube (24) includes a retrofittable aerator control module (15) that internally, sealingly interacts with the output tube (24). A tank discharge pipe (28) directs air blasts into an external application. The aerator control module (15) comprises an external actuator (30) that controls a reciprocating plunger assembly (50) that interacts with an internal plunger seat (77) to block or unblock air discharge. The plunger seat adaptor assembly (70) fitted to the aerator output tube (24) comprises a resilient plunger seat (77), that is blocked or unblocked by a plunger element (52) controlled by a slidable piston (38) that is pneumatically displaceable between tank-filling and tank discharge positions within the actuator (30). The plunger seat adaptor assembly (70) mechanically compensates for output tube misalignment to insure proper sealing. Operational air pathways pneumatically control piston movements without springs.

A method of delivering proppant to a well site has the steps of transporting a load of proppant in a vessel to a desired location, moving the load of proppant from the vessel into a container so as to create a proppant-loaded container, unloading the proppant-loaded container into a pneumatic bulk trailer, and transporting the unloaded proppant in the pneumatic bulk trailer to well site. The container is placed onto a bed of a truck and moved in proximity to the vessel. The proppant-loaded container is placed onto a tilting mechanism and then tilted so that the proppant is discharged through a flow gate of a container into a hopper. The proppant in the hopper can then be conveyed to the pneumatic bulk trailer.

A conveying system for conveying a conveyable material from a hopper where the system includes a fluid port located below the hopper outlet and in a vertical flow path into hopper outlet that can be momentarily opened for an on the go release of a charge of compressed air directly upward into the hopper outlet and into the underside of the bridge in the hopper to either disintegrate or unlock the bridged particles from each other thereby causing the bridged material to fall into the hopper outlet and into the conveying system where the material can be transported to a remote location or to remove any material that may be adhering to the wall during an emptying phase.

A containing apparatus for eliminating bridging has a body and a pulse module. The body has a chamber formed inside. The pulse module is connected with the body, and has at least one nozzle and an air supply. The at least one nozzle is connected to the body. The air supply is connected to the at least one nozzle, and is able to pulse gas into the chamber of the body. By utilizing air pulse to collapse a piled arch structure of contents, bridging in the chamber may be eliminated.

A conveying system for conveying a conveyable material from a hopper where the system includes a fluid port located below the hopper outlet and in a vertical flow path into hopper outlet that can be momentarily opened for an on the go release of a charge of compressed air directly upward into the hopper outlet and into the underside of the bridge in the hopper to either disintegrate or unlock the bridged particles from each other thereby causing the bridged material to fall into the hopper outlet and into the conveying system where the material can be transported to a remote location or to remove any material that may be adhering to the wall during an emptying phase.