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Nanotube yarn

06.01.2003

A few years ago, physicists learned how to make hollow tubes of submicron diameter from carbon atoms. They are distinguished by high strength, but it was impossible to apply this property of carbon tubes anywhere, since their length was only fractions of a millimeter.

Now, Chinese scientists at Jinhua University have accidentally found a way to make long filaments from nanotubes. Having synthesized a pack of such tubes, they tried to pick up this pack with a thin needle under the objective of the Alektron microscope. But behind the needle stretched a thread of tubules linked by electrostatic van der Waals forces acting between individual atoms.

The thickness of each tube is 10 nanometers, that is, only 100 times the diameter of a hydrogen atom. This method, similar to the unwinding of silkworm cocoons, can produce heavy-duty threads one-tenth of a millimeter thick and up to 30 centimeters long. Heat treatment of the threads makes it possible to further increase their tensile strength by more than six times.

Researchers hope that in five to ten years they will be able to spin heavy-duty cables from carbon filaments and weave fabric for lightweight and flexible body armor.

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Radeon RX 640 graphics card 10.05.2022

AMD introduced the Radeon RX 6400 graphics card to the market. It is the most affordable 3D accelerator of the Navi 2X family and was introduced along with the Radeon RX 6500 XT. Both devices are based on a 6-nm AMD Navi 24 GPU, while the younger model stands out for its rather modest appetites.

The AMD Radeon RX 6400 graphics card uses the Navi 24 core in a configuration with 768 stream processors, 12 Ray Accelerators for ray tracing, 16 MB Infinity Cache, and a 64-bit memory interface.

The video buffer is equipped with four gigabytes of GDDR6 with an effective frequency of 14 GHz, the GPU frequency formula is 2039/2321 MHz (Game/Boost Clock). Four PCI-E 4.0 lanes act as a connection interface.

The reference Radeon RX 6400 has a single-slot, low-profile design. As for versions from AIB partners, there are also full-size two-slot models. The standard TBP level is only 53 W, so the novelty does without an additional power connector. To output a picture, you can use the DisplayPort 1.4 and HDMI 2.1 interfaces.

The price of new video cards - from 159 dollars.

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