Interfacing the aluminium-air battery with telecommunications equipment
The tests carried out by British Telecom (BT) on the aluminum-air battery with regard to using the battery in a standby power system are described. The background to BT's interest in the aluminium-air battery is outlined along with the design considerations of a prototype power system to be installed in the switching network. The need for an interfacing DC/DC converter between the battery and the equipment is described, and the converter's novel features and operation are explained.<<ETX>>
The aluminum-air reserve battery-a power supply for prolonged emergencies
An aluminum-air battery has been developed that can be stored for extended periods in the reserve condition and will provide over 360 Wh/Kg (>350 Wh/dm/sup 3/) when discharged at a power output in the 1 kW range. Its rated power is developed within 30 minutes of activation. In combination with a sealed rechargeable lead-acid battery, the aluminum-air battery provides an emergency power supply that will function automatically for several days. The lead-acid battery supplies the power during mains outages lasting a few hours, with the aluminum-air battery taking over if the emergency is protracted. The exceptionally high energy density for this battery owes much to the development of a highly efficient aluminum anode alloy and to an electrolyte lifetime. A low-cost proprietary cathode makes this battery an economical attractive source of extended power supply. The described combination of rechargeable and reserve batteries is thought to be especially suitable as a source of emergency power for telecommunications systems to cover short or extended power failures.<<ETX>>
Enumeration of total coliforms, fecal coliforms, and Escherichia coli in foods by hydrophobic grid membrane filter: supplementary report.
Raw, comminuted poultry meat was used to determine the specificity of the media and incubation conditions used in the hydrophobic grid membrane filter method. Confirmation rates for target colonies were 100% for total coliforms, 98% for fecal coliforms, and 97-99% for Escherichia coli. The results of total coliform enumeration in 30 pasteurized milk samples by both the hydrophobic grid membrane filter method and AOAC method 46.013-46.016 are also reported.