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Free technical library for hobbyists and professionals

As of March 18, 2024 in the database diagram.com.ua 500000 articles

Random section of the Free Technical Library:

Amateur radio calculations



Read interesting articles:


About the calculation of steps on a field-effect transistor, A simple and quick way to calculate power supplies, Basic formulas for calculating antennas, Calculating LC filters, Calculating RC filters, Calculating an acoustic phase inverter, Calculating the frequency response of narrow-band microwave filters, Calculating power supplies, Calculating a rectifier, Calculating chokes on MLT resistors, Calculation of inductors, Calculation of oscillatory circuits, Calculation of tube amplifiers, Calculation of non-linear circuits, Calculation of a power supply network transformer ... all articles of the section >>

NEWS OF SCIENCE AND TECHNOLOGY,
NEW IN ELECTRONICS

Regularly replenished compilation the most interesting news of science and technology, new electronics. Large archive of articles from 2000 to 2024. Based on materials from periodicals and the Internet.

Latest news of science and technology, new electronics:

Using Apple Vision Pro during surgery 16.03.2024

The medical team at Cromwell Hospital in London used Apple Vision Pro for the first time during two spinal surgeries. This event confirms the headset's potential as a medical tool that will change the way surgical practice is performed. Although the doctors themselves did not use Vision Pro, the operating room nurse worked with virtual reality using glasses while preparing and performing procedures. The headset made it possible to view virtual screens in the operating room, select instruments and monitor the progress of the operation. Software developed by eXeX, a company that specializes in creating artificial intelligence-based applications for surgery, has significantly improved the patient care process. Using Apple Vision Pro opens up new opportunities for developing healthcare applications such as clinical education, surgical planning, training and medical imaging. Implementation of Apple Vision Pro in the medical industry ... >>

Carbon storage in the North Sea 16.03.2024

Norwegian Energy Minister Terje Åsland has announced the launch of the Longship project, which aims to create a central carbon dioxide storage facility in the North Sea. This ambitious project is valued at $2,6 billion and aims to apply CCS (carbon capture and storage) technology to mitigate the impact of climate change. Norway already has experience in CCS, thanks to the successful Sleipner and Snohvit projects, and is now looking to increase the amount of carbon sealed beneath the seabed. Longship's plan calls for capacity to capture and store 1,5 million tons of carbon annually over 25 years. Despite the positive outlook, there are concerns about the long-term consequences of such storage. However, proponents of the project argue that offshore carbon storage has a number of advantages, including minimal environmental impact. The Longship project is carried out with the participation of Equinor, Shell and TotalEnergies through the joint venture Northern Li ... >>

Mini-organs grown from human amniotic fluid 15.03.2024

An international team of scientists led by Professor Fan Xiulin from Zhejiang University has developed a unique method of growing mini-organs from cells found in human amniotic fluid. This significant medical breakthrough could lead to improved diagnosis and treatment of congenital diseases. The organoids, which are three-dimensional cellular structures that mimic organs on a smaller scale, were grown from lung, kidney and small intestine cells found in amniotic fluid. This method opens up new possibilities for studying various fetal conditions and may be the key to early diagnosis and treatment of birth defects. Although no treatment has yet been attempted, the scientists hope their research will help combat the serious congenital diseases that affect millions of newborns each year. This breakthrough could change medical interventions by making it possible to diagnose and treat congenital diseases. ... >>

Random news from the Archive

Indifference vs. insomnia 26.05.2013

Scientists at the University of Pittsburgh have found a type of nervous system dysfunction that underlies emotion control and is associated with insomnia. For the first time, a mechanism has been discovered that is associated with insomnia and the risk of depression. It can be acted on relatively simply, so that an effective remedy may be found for the treatment of common nervous disorders.

Now insomnia has been definitively "approved as" a risk factor for depression. Changes in the brain circuitry that regulates emotions can lead to depression, and sleep disturbance is the cause of many psychiatric disorders.

The study included 14 patients with chronic insomnia and no other primary psychiatric disorders, as well as 30 healthy individuals who served as controls. Participants underwent MRI scans while performing tasks that require an emotional response: viewing emotionally negative or neutral photographs. Subjects were asked to look at the photo normally (passively) or try to reduce the emotional response through reassessment and regulation of emotions (in order to see less negativity in the photo).

The results of the study show that in the main group (with insomnia) during normal viewing, the activity of the amygdala was lower than during viewing with an overestimation of the attitude to what was seen. At the same time, there was a difference between people with insomnia and healthy people: in the latter, the activity of the amygdala during the reassessment was significantly higher. During passive viewing, no such difference in amygdala activity was observed.

Thus, theoretically, stimulation of the amygdala may have an effect on depression. A simple mechanism related to emotional perception can help 10-15% of people on the planet who suffer from insomnia and related depression. On the whole, however, the study in some sense confirms the old idea that our state of mind is largely determined by our attitude to ongoing events.

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News feed of science and technology, new electronics

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ARTICLES, REFERENCE MATERIALS, ENCYCLOPEDIAS

Articles, reference materials, encyclopedias

EFFECTIVE FOCUSES AND THEIR CLUES

Tricks and tricks with detailed explanation

ENTERTAINING EXPERIENCES AT HOME

Entertaining experiences at home

FREE ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING

Encyclopedia of radio electronics and electrical engineering. Articles with diagrams, illustrations, comments

In section Encyclopedia of radio electronics and electrical engineering presents the most interesting electronic designs, diagrams, descriptions, reference materials with illustrations and explanations.

For any article Encyclopedias you can leave your comment.

ENCYCLOPEDIA OF RADIO ELECTRONICS.
BEST ARTICLES FOR RADIO ELECTRONICS

Encyclopedia of radio electronics. The best articles for radio electronics

ENCYCLOPEDIA OF ELECTRICAL ENGINEERING.
BEST ARTICLES FOR ELECTRICIANS

Encyclopedia of electrical engineering. Best Articles for an Electrician

AT LEISURE

Effective means for relaxation and good mood

A random story from the life of a radio amateur:

It was winter. They gave the object - to the autoline of traffic lights between two underground parking lots in the business center on Savelovskaya. It was necessary to come up with and implement a scheme of their own cooking. I am a specialist with 28 years of experience, but I switched to another profession a long time ago. They sketched a diagram with my boss (the word OAK does not even fit him). He advises me: he draws so seriously, he pushes me, I nod stupidly, and inside everything is torn and shaking with laughter. Have drawn. Let's go to the Savelovsky market to look for something (I'm not a debater - let's go). Naturally, miraculously, we didn’t find much, but still we found switches and a power supply, and I gently insisted that it was necessary only with a transformer (reliability from overheating), not an impulse switch - it was a painfully cool object and through our fault the Lexuses would kiss. They walked for a long time. I also insisted on additional fuses, intended for stupid guards (they put the foil in - and goodbye). Found 1,6 amp fuses. My boss is having a dialogue, I'm pointing my finger - otherwise it doesn't reach him. I am generally polite and intelligent, but when I bust, I break my jaw without talking. Here I am rushing with fun: a free show of the seller and the boss. Seller: "I'm a specialist with six years of experience, we'll find everything, don't worry." My boss: "Do you have HIGH VOLTAGE fuses?" This one: "The guy from the warehouse will bring it right now, wait." I neighed for a good 5 minutes, lay in front of the people in the window, almost peed myself, to which the boss asks with childish naivety: "What's wrong?" I suddenly remembered the weather...
Other stories from the life of radio amateurs | Random fun story

Random fun puzzle:

Which peninsula speaks about its size?


Other fun puzzles | Random fun puzzle

Random Question Quiz Online:

Which character is not in Maurice Maeterlinck's The Blue Bird?

A: Bread
B: Sahara
C: Milk
D: Salts


Other Quiz Questions | Random five questions

Random aphorism:

"I've always said that a woman should be like a good horror film: the more left to the imagination, the better" (Alfred Hitchcock)
Other aphorisms | Random aphorism

Random proverb:

Faith often turns into doubt. Afghan proverb
Other proverbs of the peoples of the world | Random proverb

Random phraseological unit:

Better sing well as a goldfinch than badly as a nightingale
(It’s better to do your job well, which is well known to you, than to pretend to be someone else’s, albeit significant, role and cope poorly with it)
From the fable "The Starling" (1816) by I. A. Krylov (1769-1844).
Other phraseological units | Random phraseological unit

Random phrase in Latin:

Causa materialis. - Material reason.
Other phrases in Latin | Random phrase in Latin

Random fact "Did you know?":

As a result of the melting of the Greenland ice, the balance of the globe was disturbed, and the North Pole began to shift towards Greenland at a speed of 27 centimeters per year.
Other Facts "Did You Know?" | Random interesting fact

Random article of the Great Encyclopedia for Children and Adults:

How many stars and stripes are on the US flag and why?

On July 14, 1777, the second Continental Congress in Philadelphia passed a resolution according to which the US national flag was to have 13 stripes, alternately red and white, and 13 white stars on a blue field, which personify a new constellation - the union of 13 former English colonies united in struggle for independence from Britain. The number of stripes (7 red and 6 white) has remained unchanged since then, and the number of stars has increased with the increase in the number of states in the United States.

The modern American flag with 50 stars was first raised in July 1960 in connection with the new state of Hawaii. A year earlier, the 49th star appeared on the flag when Alaska became a state.

Before that, the last time the number of stars changed was in 1912, when New Mexico and Arizona became states.

Other articles of the Great Encyclopedia | Random article of the Great Encyclopedia

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