21

Physics, Astronomy & Cosmology / Re: Can someone mine 102 tons of coal in 5 hours and 45 minutes w/ 1935 technology?

« on: 17/09/2021 15:20:00 »

1. The industrial field was not so advanced and implemented in Russia at that time.
2. Stakhanov team used pneumatic coal picks.
3. His 'new idea' of the teamwork strategy was: effective tasks separation.
4. He selected a coal-rich mine site for the test.
5. The record ‘confusion’ is that actually 5 miners were working, but the whole volume was attributed only to Stakhanov.

22

Physics, Astronomy & Cosmology / Re: Can someone mine 102 tons of coal in 5 hours and 45 minutes w/ 1935 technology?

« on: 17/09/2021 08:31:55 »

The end of XIX - beginning of XX mining tools: hand drills, hammers, pneumatic coal picks, blasting (where it is possible), collapsing of the coal seam roof was used for the thick coal seams.

23

Physics, Astronomy & Cosmology / Re: Can someone mine 102 tons of coal in 5 hours and 45 minutes w/ 1935 technology?

« on: 09/09/2021 13:30:12 »

Commenting the news André Gide asked if that could mean that previously the miners were working just 14 times worse?

24

Physics, Astronomy & Cosmology / Re: Can someone mine 102 tons of coal in 5 hours and 45 minutes w/ 1935 technology?

« on: 09/09/2021 12:47:57 »

Did he pack it and bring it to the surface too?

No, just 'mined', not bringing to the surface.

25

Physics, Astronomy & Cosmology / Re: Someone mined 102 tons of coal in 5 hours and 45 minutes?

« on: 09/09/2021 11:36:26 »

Alexey Grigoryevich Stakhanov: Record disputed: https://en.wikipedia.org/wiki/Alexey_Stakhanov#Record_disputed
No heavy machinery, several people. It was a new technology of team working, when they needed to mine the coal and fortified with logs the vault of the mine.
I believe there must be a special case of the mining front, where fortification is easy and the mining front is wide enough.
Cannot argue the numbers.
There are many videos on youtube showing, how mining is done in extreme cases.
Still in many cases automatization and heavy machinery may not be implemented in the front.

26

Physics, Astronomy & Cosmology / Re: Lagrangian Mechanics - Why is Nature lazy?

« on: 03/09/2021 12:26:40 »

What does the extra number crunching add?

Usually - more precision or additional model. Let's see after several months, what will change. Pandemic is here to stay for a while, and news about statistics, numbers, behaviors become public regularly.

27

Physics, Astronomy & Cosmology / Re: Lagrangian Mechanics - Why is Nature lazy?

« on: 03/09/2021 09:34:36 »

Chemists and Biologist's don't seem to think that there's a Lagrangian for every problem and every system they want to examine.

There may  be one (I don't know), but it doesn't seem to be the most practical way to a solution.

In principle, there's an electron wave function of every nut and bolt in a car (and for the car as a whole).
But it would be absurd for a mechanic to calculate them.

'Lagrangian mechanics' is a foundation to many fields. I know better of its principles to be used in economics.
I have got a consultancy from medical experts.
For medical practices there is no ready model (which can be expressed by equations), there is previous experience (that might be put as potential energy analogue) with lots of statistical data, and a vector, which is applied to ‘draw’ the path with experiments. And sometimes this path goes more or less steady, giving a trustable result. But in some cases it may have an unexpected turn, that gives new statistical data and experience to start again.
In the case of RNA vaccine, the result might really look as ‘0’ or ‘1’. But still it is probabilistic model.
RNA gets into a cell, it instructs the cell to make the SARS-CoV-2 spike protein for the immune system to respond to. It depends on a certain state of the immune system of a person.

For me, to put it to a model, this is a Machine Learning principle. Putting result to ‘0’ or ‘1’, where ‘1’ - should be vaccine applicable to a majority of people with certain features (e. g. age, blood type, etc.). Then run tests.

28

Physics, Astronomy & Cosmology / Re: Lagrangian Mechanics - Why is Nature lazy?

« on: 02/09/2021 19:52:01 »

Why is Nature lazy?   Why does it always want to minimise something?
   What actually makes you so sure there is always a thing, the action, that we can define and Nature would want to minimise that?

Thank you, for understanding and clarifying the question.
My first explanation was rather 'project management' approach: where we are, were we need to get (result), and what time we have to get the result?
Nice that many things in other areas come to differential equations.

The question on the level of biology/chemistry/physics is deeper. Probably they went with experience, knowledge and trials, and the nature of viruses just follows the nature.
1. Do the biologists and chemists use similar equations? (I was always trying to escape with math from that) - needs answer.
2. Why Nature evolution goes like this 'lazy' way and if it does it all the time? - needs answer (probably or approximate hypothesis comes to some of 'energy conservation' and entropy answers?).

29

Physics, Astronomy & Cosmology / Re: Lagrangian Mechanics - Why is Nature lazy?

« on: 02/09/2021 14:41:36 »

For me, the ‘Stationary-action principle’ (principle of least action) also looks applicable as the answer.

The article explains all details, history, disputes and the ‘See also’ part is very useful.
https://en.wikipedia.org/wiki/Stationary-action_principle

As for vaccines, the principle of least action might be explained like this.

Any approach from state or point A to B takes a path that minimizes ‘something’: curves, spirals, anything.
‘Something’ is the action (A), which is described with:
- how fast is it going (K)
- position, where it is now (P)
A = K - P of the object in the entire path.
A= ∫ (K - T) dt

30

Physics, Astronomy & Cosmology / Re: What's the relationship between the speed of information and the speed of light?

« on: 31/08/2021 13:52:33 »

Not indicating relation to the speed of light here.

Quantum computers store and share information not in 2 states of a bit (0 or 1), but in qubits, which also take on so-called superposition states. The quantum state of a qubit is defined by the number of superconducting electron pairs.
https://en.wikipedia.org/wiki/Qubit
Classical information is measured using Shannon entropy, while the quantum mechanical analogue is Von Neumann entropy.

31

Physics, Astronomy & Cosmology / Re: How does a diffraction grating really work?

« on: 28/08/2021 13:42:14 »

- Explain that in this case a beam of light is a wave. For the 2 slit demonstration it could be done with 2 wave sources of water (e. g. in a bath). So it means each slit is an identical source.
- Let them know the scale: length for each colour of light-wave.
- CD, laser or holographic sticker sheets might be somewhere near.

32

Physics, Astronomy & Cosmology / Re: ESA and NASA are gonna make a partnership in some environmental campaign

« on: 28/08/2021 11:12:07 »

Yes, Goggles translates boggles!
👍
Agreed!

Muscles have a lil memory.
& Tissues too.

But holding meaningful conversation & being clearly communicatively receptive is the art field of the brain.

Ps - The brain is survival, the heart brings meaning & the mind simply exists.
Brains must have evolved for a purpose, other than to simply survive.
🤔

Mark Manson and Rahul Jandial books comprehension (from a glimpse of my bookshelf) might save this argue of P.S.: 'being clearly communicatively - [must have been communicative - my humble opiniion]'.

33

General Science / Re: If the speed of light is constant, time must be constant too?

« on: 27/08/2021 16:32:37 »

'c' - is the constant and independent to observer, it is zero-mass particle velocity, from point of view of a photon time=0.
c is derived from electromagnetic experiments and 'distilled' in general relativity theory.
Speed of light changes, as it passes different media.
Time is a measurement conceived by an observer, and is not the same.

34

Technology / Re: Install Python on Ubuntu

« on: 27/08/2021 08:07:21 »

Thank you for feedback!
Precious experience share.

35

General Science / Re: Measuring time how important is it

« on: 26/08/2021 08:18:27 »

but a farmer, for instance, even a calendar is not needed.

Far from the truth. A calendar is essential for trade and whilst you might not want to plant crops in frozen soil, plants and animals have a very good sense of seasons so you have to be able to anticipate their functions and plan your year to the nearest day when you have rain, unfrozen soil, or whatever.. Hence vital structures like Stonehenge mark fixed points in the solar cycle and Egyptian astronomers predicted the Nile floods

Agree.
Stonehenge mark was vital (it also served more than that).
I looked just 100 years to the past. Birds, trees, plants, soil itself tell the time. Phenology science.
Calendar spring is not the mark, real time for soil readiness varies, according to winds, snow, etc.
Of course, you are right, it is hard to imagine planning trades without a calendar.

36

General Science / Re: Measuring time how important is it

« on: 25/08/2021 15:47:45 »

With different precision of timing measurements are used for:
Distributed applications and softwares that deal with transactions
Messaging-related client and servers
GPS, Telecommunication (starting from 4G in some applications)
Advanced filesystems, as AFS, DFS, GFS, GPFS
System information messages logging
Remote employees logging
Challenging fundamental constants
Fashionable look with a watch (showing precise time twice a day might also count).
If one doesn’t need all of this, not primitive, but a farmer, for instance, even a calendar is not needed. Sun, nature signs are enough (it is not so far, a century ago).

37

Physics, Astronomy & Cosmology / Re: ESA and NASA are gonna make a partnership in some environmental campaign

« on: 24/08/2021 16:10:07 »

Spasiba Comrade!
🙏
Or Nee Haow!

Watever works for you.

@TommyJ
Google Translate
🤔

all of them ok as long as it is from the bottom of your heart .. or mind?
neuroscience is not sure for this question yet

even Google translate seems to be not 100% confident)

38

Physics, Astronomy & Cosmology / Re: ESA and NASA are gonna make a partnership in some environmental campaign

« on: 23/08/2021 10:20:08 »

Some studies, analysis are done that are following the collected measurements.
Modeling is done using regression and monte carlo for overall impact of human activities
There are still no accumulated observations of natural variability effects, which might be larger than we currently think.There seems no strong evidence for it.
National agencies, World agencies, research institutions. Improvement plans and on-going work.
Rather than following actual names and actual results what ever they are now.

39

Technology / Re: How to make MILLIONS of people, robots and drones TETHERED

« on: 23/08/2021 09:57:33 »

Bizzare because they try to show up with something that might be surprising. But it need to be developed yet.
Everyday agricultural, 'smart home' things are working.
'Smart city' is working:)
Electroencephalography (EEG) can be obtained by a gadget and sent to your smartphone.

Sending thoughts experiment was much told about. But even sending 'ciao' from brain to brain took too much effort.
It is far from the first whoa (hello) by the telephone.

40

Physics, Astronomy & Cosmology / Re: ESA and NASA are gonna make a partnership in some environmental campaign

« on: 20/08/2021 15:41:08 »

Such kinds of satellites has already been involved in the environmental preservation campaign. Some small space agencies from Europe and from other countries all over the world manufacture microsatellite in order to observe the land

Yes, they have already done.
https://en.wikipedia.org/wiki/List_of_private_spaceflight_companies
From which I checked operational:
Skyrora (Europe)
Rocket Lab (New Zealand)
Virgin Orbit (US)
Northrop Grumman Innovation Systems (US)