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34results about How to "Economically feasible" patented technology

Virtual private networks and methods for their operation

In methods and apparatus for routing packets through a communications network, a respective distinct broadcast address is assigned to each of a plurality of distinct sets of virtual ports. No virtual port belongs to more than one of the distinct sets. A respective egress address is assigned to each packet entering the network via an ingress virtual port. The respective egress address corresponds to a respective destination address of the entering packet when a correspondence between the destination address and an egress address is known. When no correspondence between the destination address and an egress address is known, the respective egress address is a broadcast egress address corresponding to the set comprising the ingress virtual port. The packet is routed according to the respective egress address. The routing is restricted to virtual ports belonging to the distinct set of virtual ports that includes the ingress virtual port. The distinct sets of virtual ports and their associated broadcast addresses define isolated virtual private networks within the network. Each physical port of the network may map one-to-one onto a corresponding virtual port, or may map onto a corresponding plurality of virtual ports, in which case the each virtual port of the plurality is associated with a respective distinct combination of a physical address of the physical port and a respective virtual network identifier.
Owner:RPX CLEARINGHOUSE

Desulfurization wastewater recycling process and implementation device

The invention belongs to the field of industrial wastewater treatment. A desulfurization wastewater recycling process includes: pretreating desulfurization wastewater discharged from a desulfurizationtower, mixing pretreated desulfurization wastewater with strong acid, performing gas-liquid mass transfer process treatment, collecting gas generated in gas-liquid mass transfer process treatment, adding lime milk into desulfurization wastewater after gas-liquid mass transfer process treatment to adjust pH to a certain fixed value, and returning wastewater reaching conditions of serving as replenishing water for a desulfurization process into the desulfurization tower to realize recycling. The implementation device of the desulfurization wastewater recycling process comprises a gas-liquid mass transfer device and a wastewater pH adjusting device. A pretreatment tank, an acid adjustment tank and the gas-liquid mass transfer device are in sequential connection, and a first spray tower and asecond spray tower are connected with a tail gas collection device and the wastewater pH adjusting device respectively. The process has advantages that by the engineering design, the process is slightly affected by desulfurization wastewater fluctuation, lower in investment and operating cost than similar processes, free of secondary pollutant solid wastes and the like, easiness in automatic operating of engineering and the like.
Owner:SHENGFA ENVIRONMENT PROTECTION TECH XIAMEN CO LTD +1
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