The Double Cross of Justice

Postcard advertising Jack Kevorkian's exhibit at the Armenian Library and Museum of America in Watertown, Mass., September 19 through October 24, 1999. On front of the postcard is a reproduction of Kevorkian's painting "The Double Cross of Justice."

The Double Cross of Justice" (verso

Verso of a postcard advertising Jack Kevorkian's exhibit at the Armenian Library and Museum of America in Watertown, Mass., September 19 through October 24, 1999. On front of the postcard is a reproduction of Kevorkian's painting "The Double Cross of Justice."

Iron Miners double jacking

Stereograph

J.B. Longacre print after Thomas Sully painting of Alexander Macomb [original ptg West Point Museum Art Collection, U.S. Military Academy]

Scanned to edge of engraving plate mark - NOT to edge of sheet

Galvanic corrosion of magnesium alloy AZ91D in contact with an aluminium alloy, steel and zinc

An investigation was carried out into the galvanic corrosion of magnesium alloy AZ91D in contact with zinc, aluminium alloy A380 and 4150 steel. Specially designed test panels were used to measure galvanic currents under salt spray conditions. It was found that the distributions of the galvanic current densities on AZ91D and on the cathodes were different. An insulating spacer between the AZ91D anode and the cathodes could not eliminate galvanic corrosion. Steel was the worst cathode and aluminium the least aggressive to AZ91D. Corrosion products from the anode and cathodes appeared to be able to affect the galvanic corrosion process through an alkalisation, passivation, poisoning effect or shortcut effect. (C) 2003 Elsevier Ltd. All rights reserved.

A low-profile dual-band antenna for a wireless LAN access point

The design of dual-band 2.45/5.2 GHz antenna for an acces point of a Wireless Local Area Network (LAN) is presented. The proposed antenna is formed by a Radial Line Slot Array (RLSA) operating at 2.4 GHz and a Microstrip patch working at 5.2 GHz, both featuring circular polarization. The design of this antenna system is accomplished using commercially available Finite Element software. High Frequency Structure Simulator (HFSS) of Ansoft and an in-house developed iteration procedure. The performance of the designed antenna is assessed in terms of return loss (RL), radiation pattern and polarization purity in the two frequency bands.