Abstract: A refrigeration process is disclosed that employs a mixed refrigerant to chill a process gas stream in which a second stream is cooled against rewarming vaporized mixed refrigerant at low pressure and subsequently is at least partially vaporized against at least partially condensed mixed refrigerant at a higher pressure.

Abstract: The recovery of ethylene from light gases at low temperature by the use of a mixed refrigeration system comprising methane, ehtylene and/or ethane, and propylene and/or propane.

Abstract: A refrigeration process is disclosed that employs a mixed refrigerant to chill a process gas stream in which a second stream is cooled against rewarming vaporized mixed refrigerant at low pressure and subsequently is at least partially vaporized against at least partially condensed mixed refrigerant at a higher pressure.

Abstract: The recovery of ethylene from light gases at low temperature by the use of a mixed refrigeration system comprising methane, ehtylene and/or ethane, and propylene and/or propane.

Abstract: A process for recovering hydrogen from a mixed hydrocarbon stream wherein the mixed hydrocarbon stream is subjected to a separation technique to produce a substantially hydrogen enriched stream, which is then recovered as hydrogen product. A process for providing refrigeration duty to the process is also disclosed, wherein a substantially methane enriched stream arising from the separation technique is expanded to provide cooling duty for the process.

Abstract: A method of producing Y-junction carbon nanotubes. An alumina template with branched growth channels is produced after which individual Y-junction carbon nanotubes are grown directly by pyrolysis of acetylene using cobalt catalysis. The use of a branched growth channel allows the natural simultaneous formation of a very large number of individual but well-aligned three-port Y-junction carbon nanotubes with excellent uniformity and control over the length (up to several tens &mgr;m) and diameter (15-100 nm) of the “stem” and “branches” separately. These Y-junctions offer the nanoelectronics community a new base material for molecular scale electronic devices including for example transistors and rectifiers.

Abstract: A message queuing mail system is improved by preventing duplication of mail messages at the source when the same mail message is being sent to a plurality of destinations and also preventing unnecessary later redirection of mail messages in the mail delivery network, without requiring that the mail delivery netowrk have access to a mail directory, by defining addressing information and procedures that create, manipulate, and use the addressing information in a way that ensures that messages are replicated and redirected in the mail delivery network only when required.

Abstract: A free-standing shelving system comprises four uprights which support a plurality of rectangular shelves. The shelves are attached at each corner to one of the uprights. Attached at each corner of each shelf is a corner piece equipped with pegs. These pegs engage in corresponding keyhole-shaped holes in the upright to thereby securely clamp the shelf to the upright.

Abstract: A free-standing shelving system of the type comprising four uprights supports a plurality of rectangular shelves. Attachment of the shelves at each corner is to one of the uprights. Each shelf 5 is formed at each corner with a corner piece 12 which is shaped to define protruding bridge pieces 15, 16. An upright 4 is of generally W-section having a re-entrant portion formed by surfaces 21, 22 in which are formed holes 11 which are shaped and mutually spaced so as to receive the bridge pieces 15, 16. When the shelf is in place, the bridge pieces 15, 16 extend through to the exterior of the re-entrant portion, and this allows a peg 24 to be dropped into the longitudinal passageway thus defined to thereby firmly lock the assembly together.