SergUpstart

In ordinary tap water, there is both Na and Cl in sufficient quantities.

You can make water acid (up to pH=2.4) by electrolysis in a vessel with a membrane. Such acidic water is called anolyte. Personally, I regularly make such water at home and use it as an antiseptic instead of chlorhexidine

From the above photo, it can be seen that the base of the pyramids is not a square, but an octagon, or rather a four-pointed star

studiot, thank you

Yes, I would appreciate it It is enough to put the whole device in a vacuum together with the electric motor and battery and in the days of Wimhurst, it was possible to use a spring motor, as in wind-up children's toys

That's exactly what is theoretical, but have these theoretical assumptions been tested by experiment? In addition, many believe that the disks of this generator are electrified by friction with the air.

I wonder if experiments have been conducted to test whether an electrophor machine (the Wimshurst electrostatic generator) will work in a vacuum. In theory, such experiments should have been carried out, because this question interests not only me, but I did not manage to Google or Youtube anything on this issue.

I recommend watching a great movie about the pyramids " revelations of the pyramids" What is interesting to pay attention to. Pyramids are not tetrahedra. At their base is an octagon, so that on the days of the equinox at sunrise, half of the faces of the pyramids are illuminated and the other half remains in shadow. And now about choosing a place to build pyramids. The film says that if you build a straight line from Giza at an angle of 30 degrees to the parallel, then the idols from Easter Island and Machu Picchu will be on this straight line. And the Mayan pyramids are on the same parallel as Giza. I wanted to see what was on the same meridian as Giza. And it turned out that if you go from Giza to the North, you will pass through the capital of the Byzantine and later Ottoman Empire, Constantinople (Istanbul), then through the capital of Kievan Rus, Kiev, the capital of Novgorod Rus, Novgorod, and finally come to the capital of the Russian Romanov Empire, St. Petersburg.

It would be nice if a section "History and Archeology" was created on the forum

On the map of the gamma-ray sky - the electromagnetic radiation of the highest energy flowing through our universe-14 objects can hide a big secret. In a new analysis of the properties of this radiation, a team of astrophysicists determined that it is consistent with what we expect from stars made of antimatter - hypothetical objects known as anti-stars. If this were true, it would be absolutely incredible - it could help solve one of the biggest mysteries in the universe, namely, all the missing antimatter. But there are a few other things that these 14 objects could be. Every particle of matter that makes up the material we see around us, such as electrons and quarks, has an analog with identical characteristics, except for one thing: the opposite charge. It is believed that particles and antiparticles were produced in equal quantities at the beginning of the universe. When a particle and its antiparticle collide, they annihilate each other in a burst of gamma radiation, which suggests that they should still exist in equal amounts (or it doesn't exist at all), but for some reason only trace amounts of antimatter are not detected. We're kind of used to the idea that virtually none of the "original" antimatter remains in the universe. Physicists have developed models and explanations based on this assumption. This was followed by an experiment with the Alpha Magnetic Spectrometer (AMS-02) on board the International Space Station. A few years ago, a preliminary detection of antihelium was made - a discovery that, if confirmed, means that enough fundamental antiparticles could remain to cluster into whole antimatter atoms. But where? According to a group of astronomers led by Simon Dupurcke from the Institute for Research in Astrophysics and Planetary Science in France, it may be hiding in the form of anti-stars in the Milky Way. Since anti-stars will behave much like normal stars, they will be quite difficult to detect-unless normal matter, such as interstellar dust, accrets on the star's surface, where it will be annihilated by the star's antimatter. In turn, this will lead to an excess of gamma radiation at certain energies that we could theoretically detect. We did not detect the signature of annihilating gamma-ray radiation in the cosmic microwave background (this is the radiation left over from the Big Bang) or the gamma-ray surveys of the Milky Way. For their study, Dupurcke and his team focused on 10 years of data from the Fermi Space Gamma-ray Telescope, closely examining the 5,787 gamma-ray sources in it to find signs of what could be the annihilation of matter and antimatter. They specifically looked for gamma-ray signatures corresponding to the annihilation of the proton and antiproton, as well as the point geometry in the source itself, that is, it looks like a star. Of the 5,787 sources, only 14 can be considered anti-star candidates. It is unlikely that these 14 objects are anti-stars; they could easily be known gamma-ray emitters, such as pulsars or black holes. But they give us a starting point for estimating the number of anti-stars that may be lurking in the Milky Way. By simulating the accretion processes of anti-stars and assuming that they have properties similar to normal stars, the team deduced an upper limit for this number. In the disk of the Milky Way, only 2.5 stars out of a million can be anti-stars. Outside the Milky Way disk, in the galactic halo, things could have been very different. The space above and below the disk is much more empty of gas and dust, which means that any potential anti-stars accumulate less material. Without the accretion of normal matter, these anti-stars would not emit an excess of gamma radiation, and it would be easier for them to evade detection in gamma-ray surveys; in fact, they could have been hiding since the beginning of the universe. According to the team's calculations, it is unlikely that there are any anti-stars in the immediate vicinity of the Solar System. This means that the source of the antihelium is likely to be a population of these halo-anti-stars. You may also have noticed that 2.5 out of 1 million stars are not even equal proportions of antimatter and matter, so discovering stars from antimatter won't solve the problem of missing antimatter. In fact, this is likely to raise the important question of how the antimatter clumps were able to survive being surrounded by material that would destroy them in a flash of light. The team's work aims to set new, tighter limits on the number of anti-stars that can be there, so that future work has a better foundation to work on, trying to understand where and how anti-particles can be found in the Milky Way galaxy. And continuing to observe these 14 candidates will help determine whether they are anti-stars or something more mundane, like a pulsar or a black hole. The research has been published in Physical Review D.

Why not use the left isomer of sugar in the production of sweet soda. It seems like it is also sweet, but it is not absorbed by the body and therefore should not lead to obesity and type 2 diabetes and should not harm the liver as saccharin. Of course, the security would have to be thoroughly checked.

The title of this topic is "What is the size and shape of a single optical photon?" This meaningless question was asked in order to show that the concept of "shape" does not apply to the photon.

Yes, so. But whether the photon was reflected or passed on will only become clear when it is absorbed in one of the paths. What is the shape of the photon between the mirror and the absorption point????

For the third observer, the mutual velocity of the two particles should not exceed 2C, since the velocity of each particle relative to this observer cannot exceed c. In the reference frame of the third observer, the velocities are added according to the rules of vector algebra without the use of the Lorentz factor.

That's what I mean

It seems to me that trying to describe the shape of a photon is trying to explain quantum physics from the standpoint of classical physics. But this is impossible, on the contrary, classical physics is derived from quantum physics in the limiting case.

Imagine that a photon hits a semi-transparent mirror. What, it will split into two "ellipsoids"? But in the end, only one half will be absorbed, and the other half will disappear. And which specific half will be absorbed will be known only at the time of absorption.

From those lectures on quantum mechanics that I looked at on YouTube, it follows that the photon has no shape or trajectory. A photon has only two points, where it was born and where it was absorbed. Thus, the photon is a "black box", as it is arranged from the inside, we do not know.

In September and October 1942, the main battles of the Battle of Stalingrad took place north of the city. The Red Army tried to push the Germans back from Stalingrad with blows from the north. To repel these attacks, General Paulus used the main forces of his 6th army. This was the so-called "Stalingrad Verdun". With the remaining smaller forces, he continued to storm Stalingrad.

Forest belts for protection against soil erosion and the formation of large ravines In the steppe areas where there is no wood in the winter in the villages they are heated with straw and dung. Recently I heard on the radio that in ancient Egypt, donkey excrement was used to heat furnaces for smelting copper and bronze.

The signal-to-noise ratio at the output of the matched filter does not depend on the signal form, but only on the signal energy and the spectral density of the noise Q = sqrt (2E/N0) thus, you can always choose the noise power at which it will be impossible to detect a signal with a given energy. On the other hand, the energy of a signal is the product of its power and time, so for a continuous signal, you can always find the time it takes for this signal to be detected at any spectral noise density. That is, by increasing the noise power, we slow down the GPS operation and can always slow it down so much that it becomes impossible to determine our coordinates in a reasonable time. The coded signal is needed by the military so that the enemy, who does not know the structure of the signal, could not use the system. GPS jamming is facilitated by the fact that satellites in stationary orbit are located at a distance of 36,000 km, and the signal strength decreases inversely proportional to the square of the distance.

Electromagnetic waves are photons, or rather a stream of many photons, but photons are not electromagnetic waves. The photon propagates as a wave but is absorbed as a particle. And what the photon consists of can only be guessed, as long as it is a "black box", we only know its external manifestations.

GPS can be drowned out by blocking noise interference. And next to the radar, you can put several transmitters as bait, simulating a working radar. You can put several radars working in flickering mode next to each other.

In nature, there are no numbers, neither natural, nor integer, nor fractional, nor real.... Numbers are our mathematical abstraction for describing nature. And if we put the question like this, is there anything in nature that cannot be described without complex numbers, then yes, there is a wave psi function in quantum mechanics. Electrical charges

The shells are cheap, but the guns will be expensive. The firing range does not depend on the projectile and depends only on the length of the gun barrel. German super-guns "Colossal" and "Dora" were almost useless.