To enable point-to-multipoint communication services in an existing cellular communication system infrastructure, each member subscriber station (102), i.e., a subscriber station participating in such a service, is receiving a forward link shared channel (106), and in certain embodiments additionally a forward link dedicated channel. Because transmission on the forward link channels from neighboring sectors presents interference to the transmission from the sector serving the subscriber station, it is desirable to control the forward link channel transmission power to the minimum acceptable power. Additionally, a transmission from each member subscriber station on a reverse link channel (108) presents interference to other subscriber stations. Therefore, it is desirable to control the reverse link channel transmission to the minimum signal level. Consequently, a method and apparatus for a power control that enables point-to-multipoint services in an existing infrastructure of a wireless cellular telephone system is disclosed.

Power control for point-to-multipoint services provided in communication systems

A compact and portable liquid concentrator includes a gas inlet, a gas exit and a flow corridor connecting the gas inlet and the gas exit, wherein the flow corridor includes a narrowed portion that accelerates the gas through the flow corridor. A liquid inlet injects liquid into the gas stream at a point prior to the narrowed portion so that the gas-liquid mixture is thoroughly mixed within the flow corridor, causing a portion of the liquid to be evaporated. A demister or fluid scrubber downstream of the narrowed portion removes entrained liquid droplets from the gas stream and re-circulates the removed liquid to the liquid inlet through a re-circulating circuit. Fresh liquid to be concentrated is also introduced into the re-circulating circuit at a rate sufficient to offset the amount of liquid evaporated in the flow corridor.

Compact wastewater concentrator using waste heat

An apparatus for manufacturing carbonated water according to the invention can quickly produce carbonated water with a high carbonic acid gas content which does not easily lose carbonic acid gas and hence satisfactorily stimulates the throat with agreeable pungency. Since it has a simple configuration and hence is economic and effective, it can suitably be used in a carbonated beverage supplying apparatus such as an automatic vending machine, an automatic dispenser or the like. With such an arrangement, the apparatus improves its safety and hence can constantly supply delicious carbonated water.

Apparatus for manufacturing carbonated water

Compact wastewater concentrator and pollutant scrubber

A compact and portable liquid concentrator and contaminant scrubber includes a gas inlet, a gas exit and a flow corridor connecting the gas inlet and the gas exit, wherein the flow corridor includes a narrowed portion that accelerates the gas through the flow corridor. A liquid inlet injects liquid into the gas stream at a point prior to the narrowed portion so that the gas-liquid mixture is thoroughly mixed within the flow corridor, causing a portion of the liquid to be evaporated. A demister or fluid scrubber downstream of the narrowed portion removes entrained liquid droplets from the gas stream and re-circulates the removed liquid to the liquid inlet through a re-circulating circuit. A reagent may be mixed with the liquid to react with contaminants in the liquid.

Compact wastewater concentrator and contaminant scrubber

There is disclosed an improved mass transfer or gas-liquid contact device (10) having a specially contoured grid member (s) (26 to 36) interposed in the gas flow of the device (10) Ideally the grid member(s) have a cross-sectional profile which equals the sum of the theoretical velocity pressure profile of the gas flowing in an open vessel and the static and dynamic heads of the contacting liquid An additional depth is added to the grid approximately 5 to 40% more, to create an energy imbalance in favor of the introduced liquid, thereby allowing it to drain In existing vessels where it is desirable to replace prior art devices with an apparatus embodying the present invention, a plurality of grid modules may be employed, each module including a shaped grid or grid pair approximating the velocity profile of the gas stream in each

Kenneth C. Shifftner

Papers

Mass transfer contact apparatus