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Noise isolation of the car: identification and suppression of noise sources



Section Audio. The creation of any car audio system is a rather laborious process, where many different factors must be taken into account in order to reduce the number of errors that take time and money to eliminate. Moreover, the difficulties that arise in the process of such creativity negatively affect not only your budget, but also create spiritual discomfort when achieving a result that is far from desired. Therefore, in order not to break firewood, determine your goals and financial capabilities at the initial stage. For example, you can buy an inexpensive car radio that will perfectly meet your requirements, and later, when you decide to install a CD changer in your car, you will be surprised to find that this radio does not have CD drive control functions. ... >>

Metal detectors category FD (Frequency Domain)



Section Metal detectors. Among the devices of category FD, the most common, due to the simplicity of circuit solutions, are detectors of metal objects, which are based on the principle of measuring the frequency of beats that occur when two signals close in frequency are added. In specialized literature, such devices are often called BFO (Beat Frequency Oscillator) metal detectors. It must be recognized that when searching for metals with weak ferromagnetic properties, such as copper, tin or silver, BFO metal detectors are less sensitive than devices whose operation is based on other principles. ... >>

Lightning protection. General provisions



Electrical section. As you know, there is no thunder without lightning, and lightning is the most common independent spark electric discharge that occurs when the voltage between the electrodes in a gaseous medium increases, and has a very high power. Therefore, a conversation about electricity without mentioning a thunderstorm at all will be incomplete. Single thunderclouds can carry charges of different signs, therefore, when oppositely charged clouds approach, an electric discharge occurs between them - lightning. Some clouds can carry both positive and negative charges. Positive charges are usually concentrated at the bottom of the cloud, where larger drops of moisture are concentrated. ... >>

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Latest news of science and technology, new electronics:

The speech of sperm whales is similar to that of humans 18.05.2024

In the world of the ocean, where the mysterious and unknown coexists with the studied, sperm whales, with their huge brains, are of particular interest to science. Researchers, working with a huge array of audio recordings collected during the Dominica Sperm Whale Project (DSWP) - more than 8000 recordings, seek to unravel the secrets of their communication and understand the structure and complexity of the language of these mysterious creatures. By studying in detail the recordings of 60 sperm whales in the eastern Caribbean, scientists have revealed surprising features of their communication, revealing the complexity of their language. "Our observations indicate that these whales have a highly developed combinatorial communication system, including rubato and ornaments, which indicates their ability to quickly adapt and vary during communication. Despite significant differences in evolution, sperm whales have elements in their communication that are characteristic of human communication," says Shane Gero, a biologist at Carleton University and director of the CETI project. Issl ... >>

Electron spin for quantum information transfer 18.05.2024

The transfer of quantum information remains one of the key tasks of modern science. Recent advances in the use of electron spin to expand the capabilities of information transfer in quantum systems have become very important. Researchers at Lawrence Berkeley National Laboratory are pushing the frontiers of quantum information science by experimenting with the possibilities of electron spin. Electron spin, a natural quantum bit, is a potentially powerful means for storing and transmitting information in quantum systems. Magnon wave packets, collective excitations of electron spin, have revealed their potential to transmit quantum information over significant distances. The work of Berkeley Lab researchers has revolutionized the way such excitations propagate in antiferromagnets, opening up new prospects for quantum technologies. Using pairs of laser pulses, scientists disrupted antiferromagnetic order in one place and simultaneously studied it in another, creating ... >>

Sound-absorbing silk 17.05.2024

In a world where noise is becoming increasingly intrusive, the emergence of innovative materials that can reduce its impact is of great interest. MIT researchers have unveiled a new sound-absorbing silk fabric that promises to revolutionize quiet spaces. The Massachusetts Institute of Technology (MIT) has made significant breakthroughs in the field of sound absorption. Researchers have developed a special silk fabric that can effectively absorb sound and create cozy, quiet environments. The fabric, thinner than a human hair, contains a unique vibrating fiber that is activated when voltage is applied to it. This feature allows the fabric to be used to suppress sound waves in two different ways. The first method uses fabric vibrations to generate sound waves that cover and cancel out unwanted noise, similar to noise-canceling headphones. This p ... >>

Random news from the Archive

Reusable oil absorbing sponge 12.03.2017

Researchers at the Argonne National Laboratory have developed a "sponge" that sucks up 90 times its own weight in oil and can be used up to 100 times.

Oil spill cleanup is complex. There is a set of tools cleaners use to separate oil from water, but they are all slow or expensive, or both. The best way to clear the water of oil is to use a floating absorbent material called a sorbent boom that absorbs the oil. Depending on the material, absorbent boom can absorb from 3 to 70 times its weight.

The problem is that it can only be used once. Once the material absorbs enough oil, it must be removed from the water, which means that a large amount of sorbent material is required to clean up large oil spills.

The new material not only absorbs oil waste better, but it can also be reused. In tests, the "oil sponge" absorbed 90 times its own weight, after which it could simply be squeezed out and used again. Such material could significantly reduce the cost of cleaning up future oil spills.

The sponge is made of polyurethane foam coated with silicic acid, which attracts oil. The ratio of polyurethane and silicon hydrogen must be very accurate: if there is little silicon hydrogen, then the sponge will not absorb oil, and if there is a lot, it cannot be reused. So getting the exact ratio is quite difficult, and therefore such a sponge will be difficult to use in the open ocean, but in calmer coastal areas it is quite possible.

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