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World's largest XNUMXD printed building

18.12.2019

Apis Cor, a XNUMXD construction printing technology company, recently completed what could be described as the world's largest 'printed' building to date. This building, located in Dubai, is the body of an administrative building, it was erected using a single three-dimensional printer, although it is worth recognizing that much of the work was done in the old fashioned way by human builders.

The two-story administrative building has a height of 9,5 meters and a total area of ​​640 square meters. Its construction was carried out in a completely traditional way, by squeezing a cement mixture through the nozzle of the printer, which layer by layer formed the entire structure of the building. Since the building being erected was quite large in size, the Apis Cor 3D printer was suspended in the air with a crane and could only build one separate room at a time. Because of this, the entire construction process of the building took three weeks.

A fairly large part of the work was done by builders who laid the foundation, installed windows, doors, ceilings and roofs, plus carried out all internal communications. Moreover, people manually filled with concrete those rare places where the nose of a three-dimensional printer could not reach.

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Quantum dots - lamps of the future 22.05.2012

Scientists from Vanderbilt University have increased the luminescence of quantum dots by up to 45%. This is comparable to the efficiency of some commercial phosphors. In the future, this will make it possible to use quantum dots as an economical, durable source of illumination.

Today, incandescent lamps are considered hopelessly outdated. The main task of scientists is the development of highly efficient economical solid-state lighting sources that emit white light that is pleasing to the eye.

One of the most promising lighting technologies is the use of quantum dots. These tiny cadmium selenide fluorescent particles can convert the blue light emitted by a cheap, bright LED into a warm white light with the same spectrum as an incandescent lamp. This sets quantum dots apart from compact fluorescent lamps and white LEDs, which create white light using monochromatic colors.

A common measure of the efficiency of lighting fixtures is luminous efficacy, measured as the amount of visible light (lumens) per watt of power consumed. An incandescent lamp produces about 15 lumens/watt, fluorescent lamps about 100 lumens/watt. White LEDs available on the market are from 28 to 93 lumens/watt.

Until now, quantum dots have lagged far behind traditional light sources in this indicator. However, scientists from Vanderbilt University managed to increase the light output by 10 times and reach a figure of about 40 lumens / watt. At the same time, their light source emits very high-quality white, and not monochromatic light.

This was achieved using an efficient ultraviolet LED, the addition of acetic acid and ultra-small quantum dots containing only 60-70 atoms. These quantum dots are so small that almost all of their atoms are on the surface of the particles, which allows the production of white light, which is usually generated precisely by the surface atoms of quantum dots.

Currently, scientists are working on increasing light output and creating prototypes of quantum lamps. The main problem with increasing the brightness is the appearance of a bluish tint, which is so annoying for people when using LED lamps. However, according to scientists, they know how to solve this problem.

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