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Sorrel is sour. Legends, cultivation, methods of use
Horse sorrel. Legends, cultivation, methods of use
Low sorrel. Legends, cultivation, methods of use
Common sorrel. Legends, cultivation, methods of use
I'll sing right now! Popular expression
It's a sticky situation. Popular expression
Click the mare on the nose and she will wag her tail. Popular expression
Shcherba Lev Vladimirovich Famous aphorisms
Shcheritsa. Legends, cultivation, methods of use
Golden bristle. Legends, cultivation, methods of use
The bristles are scorched. Legends, cultivation, methods of use
Bristlebird. Legends, cultivation, methods of use
Secret brush. Tips for the home master
Shchi and porridge. Popular expression
Shield on the gates of Constantinople. Popular expression
Heating control panel with three groups of heating elements. Encyclopedia of radio electronics and electrical engineering
Shchitovka. Legends, cultivation, methods of use
Male shield. Legends, cultivation, methods of use
shield. Legends, cultivation, methods of use
The pike was thrown into the river. Popular expression
Probe for checking installation. Encyclopedia of radio electronics and electrical engineering
Probe-generator for testing radio equipment. Encyclopedia of radio electronics and electrical engineering
Voltage divider probe for digital multimeter. Encyclopedia of radio electronics and electrical engineering
Probe-indicator for logical signals. Encyclopedia of radio electronics and electrical engineering
Comparator probe for frequency meter. Encyclopedia of radio electronics and electrical engineering
Probe-oscilloscope. Encyclopedia of radio electronics and electrical engineering
Pike knot. Travel Tips
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Latest news of science and technology, new electronics:
Air trap for insects
01.05.2024
Agriculture is one of the key sectors of the economy, and pest control is an integral part of this process. A team of scientists from the Indian Council of Agricultural Research-Central Potato Research Institute (ICAR-CPRI), Shimla, has come up with an innovative solution to this problem - a wind-powered insect air trap. This device addresses the shortcomings of traditional pest control methods by providing real-time insect population data. The trap is powered entirely by wind energy, making it an environmentally friendly solution that requires no power. Its unique design allows monitoring of both harmful and beneficial insects, providing a complete overview of the population in any agricultural area. “By assessing target pests at the right time, we can take necessary measures to control both pests and diseases,” says Kapil ... >>
The threat of space debris to the Earth's magnetic field
01.05.2024
More and more often we hear about an increase in the amount of space debris surrounding our planet. However, it is not only active satellites and spacecraft that contribute to this problem, but also debris from old missions. The growing number of satellites launched by companies like SpaceX creates not only opportunities for the development of the Internet, but also serious threats to space security. Experts are now turning their attention to the potential implications for the Earth's magnetic field. Dr. Jonathan McDowell of the Harvard-Smithsonian Center for Astrophysics emphasizes that companies are rapidly deploying satellite constellations, and the number of satellites could grow to 100 in the next decade. The rapid development of these cosmic armadas of satellites can lead to contamination of the Earth's plasma environment with dangerous debris and a threat to the stability of the magnetosphere. Metal debris from used rockets can disrupt the ionosphere and magnetosphere. Both of these systems play a key role in protecting the atmosphere and maintaining ... >>
Solidification of bulk substances
30.04.2024
There are quite a few mysteries in the world of science, and one of them is the strange behavior of bulk materials. They may behave like a solid but suddenly turn into a flowing liquid. This phenomenon has attracted the attention of many researchers, and we may finally be getting closer to solving this mystery. Imagine sand in an hourglass. It usually flows freely, but in some cases its particles begin to get stuck, turning from a liquid to a solid. This transition has important implications for many areas, from drug production to construction. Researchers from the USA have attempted to describe this phenomenon and come closer to understanding it. In the study, the scientists conducted simulations in the laboratory using data from bags of polystyrene beads. They found that the vibrations within these sets had specific frequencies, meaning that only certain types of vibrations could travel through the material. Received ... >>
| Random news from the Archive Ionic thrust instead of reactive
15.04.2013
It is possible that in the near future there will be the first light aircraft powered by practically silent and environmentally friendly jet propulsion. Researchers from the Massachusetts Institute of Technology (MIT) conducted a series of calculations and experiments and found that atmospheric ion thrusters can be much more efficient than previously thought.
In fact, the phenomenon of electrohydrodynamic thrust, or simply ionic wind, was discovered back in 1960. Its essence is as follows: when the current passes between two electrodes, one of which is thinner than the other, an air flow is created. If you apply enough voltage to the conductors, you can get a very powerful air jet, which will be enough to keep the plane in the air.
Unfortunately, this no doubt attractive type of jet engine has long been a game for engineers and conjurers, as it was considered not powerful enough to create "serious" jet propulsion. Some scientists have suggested that atmospheric ion propulsion engines are extremely inefficient: they require a huge amount of electricity with not very high thrust.
However, calculations and experiments by MIT experts have shown that under certain conditions, ion thrusters can be a much more efficient source of thrust than conventional jet engines. In their experiments, they found that the ionic wind could deliver up to 110 newtons of thrust per kilowatt, compared to 2 newtons per kilowatt for a conventional jet engine. Thus, the ion wind is effectively used on some types of aircraft, primarily on small light aircraft. At the same time, ion engines are almost silent and invisible in the infrared range, since they do not emit a huge amount of heat, like traditional jet engines.
MIT has developed a basic design for an efficient ion thruster. The ion wind production setup consists of three parts: a very thin copper electrode (emitter), a thick aluminum tube (collector) and an air gap between them. The whole structure is assembled on a light frame, in which wires are laid to connect the collector and emitter to the power supply. When a voltage is applied, the field gradient "pulls" electrons from neighboring air molecules and ionized molecules are strongly repelled from the emitter and attracted to the collector. In this case, the ion cloud captures the surrounding neutral air molecules and creates jet thrust.
The ion thruster showed the greatest efficiency at a low air jet velocity. In other words, the ionic wind is better used to slowly move large amounts of air, rather than accelerate small volumes to supersonic speeds. This means that it is best to use the ion engine on slow aircraft, in which the air intakes for the ion wind will be located virtually over the entire surface. This immediately suggests low-profile unmanned reconnaissance aircraft with a large wingspan.
MIT calculations show the high voltage requirements of an ion thruster: a small aircraft would need a power source that could deliver hundreds or even thousands of kilovolts. The voltages must be enormous, but MIT believes that they can be obtained from ultralight solar panels and fuel cells.
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