Microphone amplifier. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Preamplifiers
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Author: A. Shikhatov; Publication: bluesmobile.com/shikhman
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Latest news of science and technology, new electronics:
Machine for thinning flowers in gardens
02.05.2024
In modern agriculture, technological progress is developing aimed at increasing the efficiency of plant care processes. The innovative Florix flower thinning machine was presented in Italy, designed to optimize the harvesting stage. This tool is equipped with mobile arms, allowing it to be easily adapted to the needs of the garden. The operator can adjust the speed of the thin wires by controlling them from the tractor cab using a joystick. This approach significantly increases the efficiency of the flower thinning process, providing the possibility of individual adjustment to the specific conditions of the garden, as well as the variety and type of fruit grown in it. After testing the Florix machine for two years on various types of fruit, the results were very encouraging. Farmers such as Filiberto Montanari, who has used a Florix machine for several years, have reported a significant reduction in the time and labor required to thin flowers.
... >>
Advanced Infrared Microscope
02.05.2024
Microscopes play an important role in scientific research, allowing scientists to delve into structures and processes invisible to the eye. However, various microscopy methods have their limitations, and among them was the limitation of resolution when using the infrared range. But the latest achievements of Japanese researchers from the University of Tokyo open up new prospects for studying the microworld. Scientists from the University of Tokyo have unveiled a new microscope that will revolutionize the capabilities of infrared microscopy. This advanced instrument allows you to see the internal structures of living bacteria with amazing clarity on the nanometer scale. Typically, mid-infrared microscopes are limited by low resolution, but the latest development from Japanese researchers overcomes these limitations. According to scientists, the developed microscope allows creating images with a resolution of up to 120 nanometers, which is 30 times higher than the resolution of traditional microscopes. ... >>
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 ... >>
| Random news from the Archive Hide from extraterrestrial civilizations
11.05.2017
Since Stephen Hawking and other scientists raised the question of why we should declare our existence to other civilizations that may not be friendly at all, the debate on this topic has not subsided. A recent article by Columbia University Associate Professor of Astronomy, David Kipping, called "How to Create an Invisibility Cloak to Hide the Earth from Extraterrestrial Civilizations?"
In it, Kipping says that if extraterrestrial civilizations, which scientists warn about, really significantly overtook us in development, then it costs them nothing, firstly, to hide from our eyes using methods that are still unknown to us, and secondly, create the illusion of visibility when it suits them. As an example, the scientist cites the so-called transit method for detecting exoplanets. It is based on observations of the passage of a planet against the background of a star, which leads to a regular, slight dimming of the star's brightness. Measurement of the depth and duration of the transit makes it possible to determine the radius of the exopanet, the semi-major axis of its orbit, and its eccentricity, provided that the orbital period of such a planet is known.
From the point of view of a scientist, such a decrease in the brilliance of a star in the eyes, or rather, in the observer's telescopes, can be deliberately caused with the help of laser devices already at our disposal in order to mislead the observer. Or vice versa: lasers can be used to compensate for the dimming and not give themselves away. This would require 30 megawatts of electricity, according to Kipping's calculations, using detection technology like that used by the Kepler space observatory, which sees exoplanets in the same light. And with an increase in power by 10 times, you can achieve "multi-colored" invisibility. For this, modern terrestrial (rather than alien) lasers come in handy, using supercontinuum generation, in which laser light is converted to light with a very wide spectrum (i.e., with low temporal coherence), while spatial coherence usually remains high.
Since the author argues that if with the help of our technologies it is possible to manipulate the visibility or invisibility in the Universe, then it is difficult to imagine what could be in the arsenal of more advanced civilizations. Therefore, the question of whether the earthlings need an invisibility cloak remains rhetorical.
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