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Reusable rocket engine

01.12.2022

China has made a breakthrough in its quest to develop reusable launch vehicles like SpaceX's Falcon 9. Engineers conducted the first hot test of a 130 ton engine.

The test involved shutting down and re-igniting the engine, a process necessary to control how and where the rocket stages return to the ground.

The engine was tested by the Aerospace Engine Academy in Xi'an, a subsidiary of the China Aerospace Science and Technology Corporation (CASC), the country's top space contractor and manufacturer of the Long March rocket family.

The engine burns a mixture of kerosene and liquid oxygen. It contains components made using 3D printing, automatic welding and intelligent assembly, and is able to regulate the thrust it generates during firing. The engine is called the YF-100N and is an improved version of the YF-100 engine used in China's current Long March 5, 6 and 7 rockets.

CASC plans to use the YF-100N for a new generation of launch vehicles, including a new reusable rocket to launch crews to the new Tiangong space station and finally to the moon. CASC plans to conduct a first flight test of the new rocket around 2026, and has said it will be able to launch a pair of rockets to facilitate a short-term crewed mission to the Moon before the end of the decade.

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Electrical stimulation of the brain helps to cope with a stroke 24.03.2016

A common complication after a stroke is complete or partial loss of mobility: it becomes difficult for a person to speak or move his arms or legs. This happens because due to blockage of blood vessels in the brain, the neurons responsible, for example, for the contraction of the muscles of the hand, die, as a result, control over the hand is partially lost. Recovery in many cases is possible - patients again begin to speak articulately, they can pick up a glass, etc. - but this happens extremely slowly and through exhausting exercises.

However, the rehabilitation process can be accelerated by using transcranial electrical stimulation, when the brain is stimulated directly from the surface of the head with a weak electric current. To participate in the experiment, Claire Allman (Claire Allman) and her colleagues from Oxford invited 24 patients, men and women, who, after a stroke, had impaired arm mobility to one degree or another.

Every day for two weeks they came to the laboratory for electrical stimulation, but the time and effort spent was worth it: those who were treated with the electrical stimulation method returned mobility faster, and such patients soon could not only raise and lower their hands, but also take objects.

Magnetic resonance imaging showed that after stimulation in patients, when they tried to move their hands, the activity of the motor cortex of the brain, on which volitional control of movements depends, increased; in addition, the proportion of gray matter increased in the same motor cortex. The effect of electrical stimulation remained for a long time - improvements in the condition of patients persisted even three months after a two-week course.

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