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Tail for a swimmer

02.01.2003

Swimmers have been using fins for a long time, and now people have borrowed a wide tail that is comfortable for swimming from pinnipeds.

The fashion to swim with a wide spade-shaped fin worn on the legs originated in the USA and is spreading all over the world. The fin is made of sheet plastic, and the latest models use thin and light, but very strong carbon fiber. With such a tail, a swimmer reaches speeds of up to 13 kilometers per hour.

A snorkel diver, having once inhaled air on the surface, swims with such equipment under water up to 150 meters.

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Latest news of science and technology, new electronics:

Energy from space for Starship 08.05.2024

Producing solar energy in space is becoming more feasible with the advent of new technologies and the development of space programs. The head of the startup Virtus Solis shared his vision of using SpaceX's Starship to create orbital power plants capable of powering the Earth. Startup Virtus Solis has unveiled an ambitious project to create orbital power plants using SpaceX's Starship. This idea could significantly change the field of solar energy production, making it more accessible and cheaper. The core of the startup's plan is to reduce the cost of launching satellites into space using Starship. This technological breakthrough is expected to make solar energy production in space more competitive with traditional energy sources. Virtual Solis plans to build large photovoltaic panels in orbit, using Starship to deliver the necessary equipment. However, one of the key challenges ... >>

New method for creating powerful batteries 08.05.2024

With the development of technology and the expanding use of electronics, the issue of creating efficient and safe energy sources is becoming increasingly urgent. Researchers at the University of Queensland have unveiled a new approach to creating high-power zinc-based batteries that could change the landscape of the energy industry. One of the main problems with traditional water-based rechargeable batteries was their low voltage, which limited their use in modern devices. But thanks to a new method developed by scientists, this drawback has been successfully overcome. As part of their research, scientists turned to a special organic compound - catechol. It turned out to be an important component that can improve battery stability and increase its efficiency. This approach has led to a significant increase in the voltage of zinc-ion batteries, making them more competitive. According to scientists, such batteries have several advantages. They have b ... >>

Alcohol content of warm beer 07.05.2024

Beer, as one of the most common alcoholic drinks, has its own unique taste, which can change depending on the temperature of consumption. A new study by an international team of scientists has found that beer temperature has a significant impact on the perception of alcoholic taste. The study, led by materials scientist Lei Jiang, found that at different temperatures, ethanol and water molecules form different types of clusters, which affects the perception of alcoholic taste. At low temperatures, more pyramid-like clusters form, which reduces the pungency of the "ethanol" taste and makes the drink taste less alcoholic. On the contrary, as the temperature increases, the clusters become more chain-like, resulting in a more pronounced alcoholic taste. This explains why the taste of some alcoholic drinks, such as baijiu, can change depending on temperature. The data obtained opens up new prospects for beverage manufacturers, ... >>

Major risk factor for gambling addiction 07.05.2024

Computer games are becoming an increasingly popular form of entertainment among teenagers, but the associated risk of gaming addiction remains a significant problem. American scientists conducted a study to determine the main factors contributing to this addiction and offer recommendations for its prevention. Over the course of six years, 385 teenagers were followed to find out what factors may predispose them to gambling addiction. The results showed that 90% of study participants were not at risk of addiction, while 10% became gambling addicts. It turned out that the key factor in the onset of gambling addiction is a low level of prosocial behavior. Teenagers with a low level of prosocial behavior do not show interest in the help and support of others, which can lead to a loss of contact with the real world and a deepening dependence on virtual reality offered by computer games. Based on these results, scientists ... >>

Traffic noise delays the growth of chicks 06.05.2024

The sounds that surround us in modern cities are becoming increasingly piercing. However, few people think about how this noise affects the animal world, especially such delicate creatures as chicks that have not yet hatched from their eggs. Recent research is shedding light on this issue, indicating serious consequences for their development and survival. Scientists have found that exposure of zebra diamondback chicks to traffic noise can cause serious disruption to their development. Experiments have shown that noise pollution can significantly delay their hatching, and those chicks that do emerge face a number of health-promoting problems. The researchers also found that the negative effects of noise pollution extend into the adult birds. Reduced chances of reproduction and decreased fertility indicate the long-term effects that traffic noise has on wildlife. The study results highlight the need ... >>

Random news from the Archive

Powerful Silicon Carbide Semiconductors from Renesas Electronics 01.02.2012

Renesas Electronics has announced the delivery of three high-power semiconductor devices that use silicon carbide (SiC). New items received the designations RJQ6020DPM, RJQ6021DPM and RJQ6022DPM. They are sets of diodes and transistors in a common package, designed for powerful converters or switches.

The products belong to Renesas' second series of silicon carbide high-power semiconductor devices, the use of which helps to reduce losses. Among the areas of application for new products, the manufacturer names servers, cellular base stations, household appliances such as air conditioners, as well as power supply systems based on solar panels.

The RJQ6020DPM package contains a high voltage SiC-SBD Schottky diode rated up to 600 V with a reverse resistance recovery time of only 15 ns, and two high voltage high power MOSFET transistors with an on-state resistance of 100 mΩ.

The RJQ6021DPM package contains a SiC-SBD diode and two insulated gate bipolar transistors (IGBTs) with a low residual on-state voltage of 1,5V. The RJQ6022DPM package contains two SiC-SBD diodes and two IGBTs.

Introductory samples of products will appear in February at a price of $10 apiece. The company expects to start serial production in May.

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