The tethered balloon, which is located in the Parc Andre Citroën, in Paris’s 15th arrondissement, uses an innovative lighting system to provide real-time reports on atmospheric pollution.
The balloon displays the quantity of the three most harmful contaminants (nitrogen dioxide, ozone and particles) found in the atmosphere, using an easy-to-understand colour coding – red for highly polluted air, orange for polluted, yellow for moderate, light green for clean and green for very clean.
In Paris, data is collected at several spots throughout the city by sensors set up by Airparif, an organisation monitoring French air quality. The data used complies with the new European Union air-pollution index developed for the CITEAIR project, which is currently used by about 30 large cities.
The balloon displays two measurements of air quality using Airparif’s data. Firstly, the ambient air quality is indicated by the colour of the balloon, using three projectors that are located upon the envelope’s equatorial plane, providing good night-time visibility. Secondly, air quality near major traffic junctions is indicated using a high-power rotating laser beam that sweeps the lower half of the envelope.
The Paris Aérophile balloon is filled with 6,000 cubic metres of helium and is tethered to the ground with a movable cable controlled by a hydroelectric winch. The environmentally friendly design is based on the Archimedes principle, and can lift up to 30 passengers (about 2.5 tonnes), without any noise or shaking, to an altitude of 150 metres above the city.
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University of Maryland researchers contribute to historic detection of gravitational waves and light created by event
On August 17, 2017, at 12:41:04 UTC, scientists made the first direct observation of a merger between two neutron stars--the dense, collapsed cores that remain...
Seven new papers describe the first-ever detection of light from a gravitational wave source. The event, caused by two neutron stars colliding and merging together, was dubbed GW170817 because it sent ripples through space-time that reached Earth on 2017 August 17. Around the world, hundreds of excited astronomers mobilized quickly and were able to observe the event using numerous telescopes, providing a wealth of new data.
Previous detections of gravitational waves have all involved the merger of two black holes, a feat that won the 2017 Nobel Prize in Physics earlier this month....
Material defects in end products can quickly result in failures in many areas of industry, and have a massive impact on the safe use of their products. This is why, in the field of quality assurance, intelligent, nondestructive sensor systems play a key role. They allow testing components and parts in a rapid and cost-efficient manner without destroying the actual product or changing its surface. Experts from the Fraunhofer IZFP in Saarbrücken will be presenting two exhibits at the Blechexpo in Stuttgart from 7–10 November 2017 that allow fast, reliable, and automated characterization of materials and detection of defects (Hall 5, Booth 5306).
When quality testing uses time-consuming destructive test methods, it can result in enormous costs due to damaging or destroying the products. And given that...
Using a new cooling technique MPQ scientists succeed at observing collisions in a dense beam of cold and slow dipolar molecules.
How do chemical reactions proceed at extremely low temperatures? The answer requires the investigation of molecular samples that are cold, dense, and slow at...
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