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Measuring technology. Schemes, articles, descriptions

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Measuring technology

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Cathodic corrosion protection for automobiles



Section Car. Electronic devices. Many car enthusiasts know that it is enough to have a small scratch - and rust begins to absorb the car downright. And it is very difficult to deal with it. Whatever tricks motorists come up with - various coatings, mastics, anticorrosives ... But the trouble is: in order to process all the most affected places with proper quality, you sometimes have to disassemble the entire car. Such an operation takes a lot of time, and requires constant monitoring. In addition, during operation, the gradual destruction of the coatings occurs. Due to vibrations during movement, microcracks appear, under the impact of stones or sand, the paint breaks off. Therefore, the desire of motorists to purchase a miracle device is quite understandable: it was spent once and forever protected the body from rust ... >>

Modulation



Section Beginner radio amateur. While the studio microphone is not turned on, a current of strictly constant frequency and amplitude flows in the antenna of the broadcasting station (see the left parts of the graphs in Fig. 39). The antenna emits radio waves of constant length and power. But then the microphone was turned on in the studio, and people who were tens, hundreds and thousands of kilometers from the radio station heard the familiar voice of the announcer. What is happening in the transmitter at this time? Sound frequency oscillations created by a microphone and amplified by a studio amplifier enter the so-called transmitter modulator and there, acting on a current with a high frequency, change the amplitude of its oscillations. This also changes the electromagnetic energy emitted by the transmitter antenna: the greater the amplitude of the current. frequency sounds, the greater the amplitude of the high-frequency current and the power of electromagnetic waves radiated by the antenna (see the right parts of the graphs in Fig. 1) ... >>

Analogue of high voltage zener diode



Section Power supply. In the absence of KS620A, KS630A, KS650A, KS680A zener diodes, you can use their analogue, assembled according to the diagram shown in the figure. The device is completely equivalent to the zener diodes of this series and can be used without any modifications. Its stabilization voltage is 120 ... 180 V (depending on the instance of the VD1 diode), the values ​​\u0,1b\u20bof the minimum and maximum stabilization currents are 500 and 550 mA, respectively, the differential resistance is XNUMX ... XNUMX Ohm ... >>

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Articles on measuring technology

Articles on measuring technique; schemes of measuring equipment; descriptions of measuring equipment: 478 articles

 


 

Latest news of science and technology, new electronics:

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 ... >>

High Energy Density Capacitor 17.05.2024

Energy plays a key role in many aspects of modern life, and the ever-increasing demand for efficient and fast-charging power sources is driving innovation. Researchers at the McKelvey School of Engineering at Washington University in St. Louis have taken a significant step forward with a high-energy-density capacitor that promises to revolutionize the world of energy. A team of scientists from the McKelvey School of Engineering at Washington University in St. Louis presented the results of their latest research on heterogeneous thin-film structures for capacitors. Researchers, working with ferroelectrics, inadvertently created a capacitor with an amazing energy density that is 19 times higher than that of conventional elements. This breakthrough opens up new prospects for the development of fast-charging batteries, which are so necessary in the modern world. Capacitors play a key role in various devices, providing stable ... >>

Causes of conflicts between brothers and sisters 16.05.2024

Family relationships are often complex and multi-layered, and conflicts between siblings are no exception. Research in this area can help us understand what factors underlie these conflicts and why they occur so frequently. Let's look at some of the findings from psychologists at Arizona State University. American psychologists from Arizona State University conducted a study aimed at identifying the causes of conflicts between brothers and sisters. They found that different forms of violence, whether physical or verbal, did not depend on the gender of the siblings. This means that both girls and boys can exhibit aggressive behavior towards their loved ones. Other studies have shown that conflict between siblings often persists into adulthood, even as contact decreases. This indicates that people often follow established patterns of behavior formed in childhood. It was also found that, despite ... >>

Random news from the Archive

Biodegradable seaweed slippers 14.08.2020

Scientists from the University of California at San Diego (USA) and Algenesis Materials have developed the design of the first biodegradable slippers - an alternative to the popular plastic summer and indoor shoes. The development helps partly solve the problem of plastic waste that ends up in landfills, on the seashore and even in the ocean.

Researchers have come up with a new "recipe" for polyurethane foam, which is 52% algae oil. Thanks to this "recipe", biodegradable shoes meet the commercial standards of products needed to destroy a ton of plastics.

During testing, the scientists dipped the new slippers into traditional compost and soil. The material decomposed in just 16 weeks. During the decomposition period, to determine the level of toxicity, the scientists measured every molecule released from the biodegradable materials. They also identified the organisms that decomposed the shoes.

In the future, the researchers hope to develop shoes that are 100% biodegradable.

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