Free technical library. Articles from the journal Science and Life, 2003

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Alphabetical list articles with annotations from journals published in 2003 in the journal Science and Life:

DVD video/photo player

Windows. Brief encyclopedia of the first acquaintance

Academician V. L. Ginzburg: Physics has a pivot

Accord-201 - the working aircraft you need

drug allergy

Anatomy of taste

antique floppy disks

Astrofest-2003: meeting with luminaries

Nuclear power plant for Mars

tower supercrane

Tower of wind power modules

Bezhetsk

White archipelago. New unknown pages of the USSR Atomic Project

Exchange: everyone plays!

Block - multi-station

Will there be a next green revolution?

Buryga

Accountant

Buenos Aires through the eyes of Alekhine

Was there Angarida?

To the European Union - for science

What century are we living in

Atomic-powered space. Dreams and reality

In the world of science

In the new age - in new clothes

You and the cards in your hands!

Boiling cabbage soup and fish soup in a paper box

Loyalty to the profession

Spring of our anxiety

News from the Internet

Video camera in the household

Video camera with solid state memory

VSHV - VDNH - VVTs. The main exhibition of the country. History and modernity

[1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11]

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Latest news of science and technology, new electronics:

Artificial leather for touch emulation 15.04.2024

In a modern technology world where distance is becoming increasingly commonplace, maintaining connection and a sense of closeness is important. Recent developments in artificial skin by German scientists from Saarland University represent a new era in virtual interactions. German researchers from Saarland University have developed ultra-thin films that can transmit the sensation of touch over a distance. This cutting-edge technology provides new opportunities for virtual communication, especially for those who find themselves far from their loved ones. The ultra-thin films developed by the researchers, just 50 micrometers thick, can be integrated into textiles and worn like a second skin. These films act as sensors that recognize tactile signals from mom or dad, and as actuators that transmit these movements to the baby. Parents' touch to the fabric activates sensors that react to pressure and deform the ultra-thin film. This ... >>

Petgugu Global cat litter 15.04.2024

Taking care of pets can often be a challenge, especially when it comes to keeping your home clean. A new interesting solution from the Petgugu Global startup has been presented, which will make life easier for cat owners and help them keep their home perfectly clean and tidy. Startup Petgugu Global has unveiled a unique cat toilet that can automatically flush feces, keeping your home clean and fresh. This innovative device is equipped with various smart sensors that monitor your pet's toilet activity and activate to automatically clean after use. The device connects to the sewer system and ensures efficient waste removal without the need for intervention from the owner. Additionally, the toilet has a large flushable storage capacity, making it ideal for multi-cat households. The Petgugu cat litter bowl is designed for use with water-soluble litters and offers a range of additional ... >>

The attractiveness of caring men 14.04.2024

The stereotype that women prefer "bad boys" has long been widespread. However, recent research conducted by British scientists from Monash University offers a new perspective on this issue. They looked at how women responded to men's emotional responsibility and willingness to help others. The study's findings could change our understanding of what makes men attractive to women. A study conducted by scientists from Monash University leads to new findings about men's attractiveness to women. In the experiment, women were shown photographs of men with brief stories about their behavior in various situations, including their reaction to an encounter with a homeless person. Some of the men ignored the homeless man, while others helped him, such as buying him food. A study found that men who showed empathy and kindness were more attractive to women compared to men who showed empathy and kindness. ... >>

Random news from the Archive

Laser holograms will improve the quality of industrial XNUMXD printing 15.12.2019

One of the shortcomings of modern industrial technologies of laser three-dimensional printing is a strong heating at the point of contact of the metal with the laser light beam. This heating melts the metal powder, but it also introduces areas of internal mechanical stress and deformation of the part to be manufactured. And all these things are practically unpredictable, which makes it impossible to somehow compensate for them. However, a group of researchers from the University of Cambridge found a way to solve the problem described above. With the help of special holographic images generated by a computer using complex algorithms, it is possible to control the distribution of laser light energy in three dimensions, which makes it possible to avoid unnecessary heating of the manufactured part.

"Instead of using a single beam of high-power laser light, we use several beams of laser light that are focused in a specific way at the right point in three-dimensional space," says Professor Tim Wilkinson (Tim Wilkinson), head of this project, - "This allows us to print parts "in a more three-dimensional way and avoid thermal distortion.

The hologram from which the XNUMXD object is printed is calculated and modified by the computer at a rate of about a thousand times per second to improve control over the distribution of energy. At the same time, the algorithms that produce the control hologram take into account a number of subtleties, such as the properties of the materials used, optical distortions, current temperature, etc. "This holographic approach allows us to do things that were previously impossible to do. There are certain types of structures that cannot be printed because of the thermal deformations that occur," says Professor Wilkinson.

Now scientists have already created a pilot plant with three lasers whose beams are reflected from a silicon "microdisplay", a thin layer of liquid crystals on the surface of a silicon chip, which acts as a controlled diffraction grating and changes the phase of the reflected laser light beam. And in the near future, the Cambridge researchers are planning to create a more advanced installation, which will use eight lasers with a total power of 200 W, which is enough to melt particles of aluminum powder.

In addition to testing the operation of liquid crystal microdisplays at this level of laser light power, scientists, using the new facility, will work with metal powders with the addition of plastics and resins to improve the algorithms for compiling control holograms. Plans call for a new and larger plant to start operating in 2020, and the project, which should result in a fully operational industrial plant, will be completed by 2022.

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