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Simple knot it is very convenient for fixing the painter of a boat or boat for a fell, biteng or single bollard.

To properly tie it, the running end of the painter must be folded in half, enclose the fell on the side, skip the loop under both ends and throw it on top of the fall.


Rice. 63. Fell Knot

Author: Skryagin L.N.

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Ultra-precise atomic clock 24.02.2022

A group of physicists at the University of Wisconsin-Madison announced the creation of super-efficient atomic clocks. The device measures time so accurately that it loses only one second in 300 billion years.

The watch will enable more accurate measurements of gravitational waves, dark matter and other physical phenomena.

An atomic clock is a clock that tracks the resonance of the frequencies of atoms, usually cesium or rubidium. This allows such watches to measure time with high accuracy. So, NASA conducted an experiment in which the atomic clock Deep Space Atomic Clock worked in orbit for two years.

Atomic clocks work by keeping track of the energy levels of electrons. When an electron changes energy level, it absorbs or emits light at a frequency that is the same for all atoms of a particular element. Optical atomic clocks keep time using a laser finely tuned to this frequency, and require some of the world's most sophisticated lasers to measure time accurately.

In a new study, scientists have created a multiplexed clock that splits strontium atoms into a line in a single vacuum chamber. The team used a "relatively lousy laser," as the study's lead author Shimon Kolkowitz called it, which was still able to achieve levels of measurement accuracy close to a world record.

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