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These experiments all ______ that a liquid exerts an upward force on any object placed in
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The smallest model of an urban turbine ______.
I have a BA in French from the University of London. I am following a part-time course in Personnel Management at the Oxford College of Management, and I hope to pass the Diploma in Personnel Management at the end of December.
When I left university, I worked for a year in a computer company near Cambridge. Then I moved back to London to work as a French teacher in a large school, where I stayed for two years. During this time, I did some part-time work as a language trainer with factory managers, which I very much enjoyed.
Three years ago, I joined Carter's Bank, where for the past year I have worked as Assistant Personnel Officer, dealing mainly with complaints from members of staff.
Having worked in a similar organisation to yours, I feel I am fully prepared for the challenges of this job.
Yours faithfully
Angela Varley
Ms Varley is applying for a job with the Daily News.
In which of the following ways do the refugees threaten the survival of such wild animals
When a swimmer sinks towards the bottom of the pool, the new system sends an alarm signal to a poolside monitoring station and a lifeguard's pager. In trials at a pool in Ancenis, near Nantes, it saved a life within just a few months, says Alistair McQuade, a spokesman for its manufacturer, Poseidon Technologies.
Poseidon keeps watch through a network of underwater and overhead video cameras. AI software analyses the images to work out swimmers, trajectories. To do this reliably, it has to tell the difference between a swimmer and the shadow of someone being cast onto the bottom or side of the pool. "The underwater environment is a very dynamic one, with many shadows and reflections dancing around." Says McQuade.
The software does this by "projecting" a shape in its field of view onto an image on the far wall of the pool. It does the same with an image from another camera viewing the shape from a different angle. If the two projections are in the same position, the shape is identified as a shadow and is ignored. But if they are different, the shape is a swimmer and so the system follows its trajectory.
To pick out potential drowning victims, anyone in the water who starts to descend slowly is added to the software's "pre-alert" list, says McQuade. Swimmers who then stay immobile on the pool bottom for 5 seconds or more are considered in danger of drowning. Poseidon double-checks that the image really is of a swimmer, not a shadow, by seeing whether it obscures the pool's floor texture when viewed from overhead. If so, it alerts the lifeguard, showing the swimmer's location on a poolside screen.
The first full-scale Poseid6n system will be officially opened next week at a pool in High Wycombe, Buckinghamshire. One man who is impressed with the idea is Travor Baylis, inventor of the clockwork radio. Baylis runs a company that installs swimming pools—and he was once an underwater escapologist with a circus. "I say full marks to them if this works and can save lives," he says. But he adds that any local authority spending ￡30,000— plus on a Poseidon system ought to be investing similar amounts in teaching children to swim.
AI stands for ______
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