Smoke Cloak
Smokecloak from Martin Security, tågesikring
http://www.smokecloak.com/

Smoke Control Services Limited
Smoke Control Services specialise in smoke control systems for multi-occupancy residential buildings providing packaged solutions designed to comply with building regulations simply and efficiently.
http://www.smokecontrol.co.uk

Smoke Rite Ovens
Complete range of Australian made smoking ovens that can smoke, roast, cook, bake and steam.
http://www.smokeriteovens.com.au

Smoke in C4D
Offers examples and tutorial information on how to use visible lights to make wispy, smoky smoke in C4D.
http://www.technoscope.com/c4d/smoke.html

Convection in a box.
Experiments with smoke inside a plexiglass box challenge convectional wisdom. Smoke can unexpectedly act heavier than air and then spontaneously reverse.
http://www.synapse9.com/airbox.htm

Concept Smoke Systems
Portable fog machines for security systems, testing applications and pyrotechnic effects. Non toxic water and oil based smoke machines from Concept Smoke
http://www.concept-smoke.co.uk/

Avon Barrier Company
We offer a wide range of vehicle and pedestrian access control systems such as parking barriers, road blockers, gate systems, turnstiles, high security equipment and revenue systems
http://www.avon-barrier.co.uk/

EU Trade Barriers Kill
A study demonstrating how the trade barriers of EU affect the poor countries, published by the Centre for the New Europe.
http://www.cne.org/pub_pdf/2003_09_04_EU_barriers_kill.pdf

Barriers & Bollards Limited
Bollards, Bollard Systems, Steel Bollards, Security Bollards by Barriers and Bollards Limited, manufacturers, suppliers and installers.
http://www.barriersandbollards.com/

Tunneling
Addresses the phenomenon of quantum tunneling. Presents animations of the scattering of a particle from two-dimensional potential barriers and wells, as well as from barriers with slits.
http://rugth30.phys.rug.nl/quantummechanics/tunnel.htm