Movable layer protects the brain: A protective helmet that mimics nature could cut the number of serious head injuries to a minimum
Article Abstract:
A crash helmet combining structural strength with an outer membrane and an inner cushion has been devised by Dr Ken Phillips, a Harley Street consultant. Brain damage by a blow to the head is mainly caused by acceleration. Different tissues move at different speeds and blood vessels and even the brain itself and its linings can be torn. The scalp or a membrane, moves in a limited way causing little friction. A high density plastic foam was used in tests on a suitably modified helmet and the maximum tangential force was around one third of that experienced when using a standard helmet.
Publication Name: Eureka
Subject: Engineering and manufacturing industries
ISSN: 0261-2097
Year: 1999
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Arcs supressed before they start
Article Abstract:
Researchers at Cambridge University have developed a method of preventing arcing in radio frequency ovens following a study ot prevent arcing and damaged to foam matresses dried in such ovens. A small change in the resonant frequency of the oven prior to an arc striking was detected. The arc is killed using a voltage signal to switch twoo MOSFETs which release further negative bias to the main oscillator triode causing output RF power to fall.
Publication Name: Eureka
Subject: Engineering and manufacturing industries
ISSN: 0261-2097
Year: 1995
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Shuttling magnet ensures efficient gas compression
Article Abstract:
An innovative electric linear motor has been designed for fridges. The motor is environmentally-friendly and uses a shuttling magnet for efficient gas compression. It includes a single moving component which acts as an armature and piston. Motor prototypes have been built to assess the effectiveness of the design. Design and development work is continuing to make the motor more efficient and cost-effective to produce.
Publication Name: Eureka
Subject: Engineering and manufacturing industries
ISSN: 0261-2097
Year: 1997
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