Tying a knot without letting go of the rope. Effective trick and its solution

EFFECTIVE FOCUSES AND THEIR CLUES
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Tying a knot without letting go of the rope. Focus Secret

Spectacular tricks and their clues

Directory / Spectacular tricks and their clues

Focus Description:

Invite your friends to tie a knot on a rope (length of rope 80-90 cm) without letting go of the ends of this rope. Most likely, no one will cope with the task.

Focus secret:

Cross your arms before picking up the rope. After you return your hands to their normal position, the knot on the rope will tie itself.

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Random news from the Archive

Efficient solar cell made from conventional silicon 03.05.2021

Scientists from the Fraunhofer Institute for Solar Energy Systems (ISE) have created a solar cell with a conversion efficiency of 26% from classic single-crystal silicon, which has become a world achievement. The new technology is simpler than the previously proposed Interdigitated Back Contact (IBC) technology with contacts on the back of the cells and promises to approach the theoretical limit of silicon when converting solar energy into electricity.

Today, the vast majority of solar panels are produced from ordinary single-crystal silicon - over 90%. It would be tempting to increase the efficiency of such panels without complicating the technology and increasing the cost of production. The IBC technology promised to help with this, when both current-carrying contacts in the cells are created on the back side of the cell, which does not obscure the panel and allows better use of the volume of the element in the process of knocking out electrons by photons. Unfortunately, although IBC panels are close to 26% in terms of efficiency, their production is quite expensive, so they turned out to be unclaimed.

Researchers at ISE have been able to bring the efficiency of single-crystal cells closer to 26% in another way and even promise to go further - to achieve an efficiency value of 27% with a theoretical limit for silicon of 29,4%. This was achieved due to the special arrangement of conductive contacts on both sides of the cells, but these are not all changes.

The new cell is based on the TOPCon contact, which is a tunnel oxide passivated contact. The new development differs from the panels produced today in that the TOPCon contact is not located on top, but lies along the entire back side of the cell. This approach also made it possible to alloy with boron not the entire front surface, but only places under the second ordinary contact remaining there, which simplified and reduced the cost of production. Thus, the new cell was named TOPCoRE (element with TOPCon contact on the back side).

In addition to high efficiency, the new element delivers more voltage, and its operation is accompanied by lower losses due to surface recombination and due to efficient electron transport.

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