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Orbital ring around the earth

24.11.2019

If you build a ring around the Earth, it seems that gravity will pull it towards the center of the Earth from all sides with the same force, which will allow the ring to "float" above the surface.

But the problem lies in the inhomogeneity of the Earth's gravitational field and the influence of the gravitational fields of neighboring celestial bodies. Such a structure will have an unstable position, which would lead to its deformation, fall and destruction. The lack of building materials of the required unimaginable strength is also a stumbling block.

When one fragment of the ring moves to the center of the Earth, the force of attraction acting on it increases, and the force acting on the opposite part decreases, so the ring falls, losing stability. That is, a small random fluctuation is enough for the entire structure to collapse.

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Test of automatic braking systems in cars 29.05.2014

Nikkei Automotive Technology magazine has published test results of various automotive obstacle and pedestrian recognition systems with automatic braking in front of them. The independent trial looked at designs from nine automotive companies.

The Japanese auto giant Fuji Heavy Industries, which produces cars under the Subaru brand, received the highest praise. They are equipped with a new generation EyeSight active safety system, which was awarded 7 points in the rating - 4 points for the ability to avoid collision with other vehicles at speeds up to 50 km / h and 3 points for automatic braking in the event of a risk of collision with a pedestrian at 40 km /h

The stereo camera in the updated EyeSight option, unlike its previous version, can recognize colors and has a 40% increase in angles and viewing distance. In addition, the reaction speed increased from 30 to 50 km/h. According to the automaker, about 80% of Subaru buyers choose to include the EyeSight feature.

In the ranking of the safest electronic assistants to avoid accidents, Volvo Car got the second place. Using the Volvo V40 hatchback as an example, journalists found that the City Safety complex effectively responds to other cars at speeds up to 40 km/h. In the case of identification of pedestrians on the roadway, the speed of the car should not exceed 30 km/h. As a result, the security system from the Swedish brand received 5 points.

The top three in the Nikkei Automotive Technology report was closed by the Japanese company Nissan Motor. It is followed by the German BMW Group. Experts draw attention to the fact that the first four places in the ranking were occupied by automakers whose automatic braking system uses cameras. They are better at detecting pedestrians than radar or infrared laser devices.

The latter are installed in Suzuki, Daihatsu and Honda cars, which scored only one point each in the study. These manufacturers completely failed the "live obstacle" test on the road.

The same one point was received by the German concern Volkswagen AG. Under his brand, the Golf Variant model was tested. Toyota Motor Company was satisfied with the result of 2 points. The operation of Volkswagen and Toyota automatic brakes is based on the radar module.

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