Kapanadze and other FE discussion

[stivep]

I used two dynamic heads, type 6gdv.
The frequency was fed to one 20 kHz, to the second 21 kHz.
Sound was received by the device ВШВ003
For some reason, I did not hear a sound at 1 kHz.

Of course  you can't hear it.
the difference between 20kHz and 21kHz is 1kHz but  frequency  of this 1kHz is still  in bandwidth your hearing  is not.
You may  down-convert it  to  any range between 20Hz to 20kHz or subtract in the mixer these two frequencies ,
this is how superheterodine works in radio
and than you'll hear it. But you can see this 1kHz at your
oscilloscope connected to your microphone.
https://en.wikipedia.org/wiki/Superheterodyne_receiver

Hint:
1. think how particle in air( micro-plastic) can hear  and react with  a particular frequency of sound wave= longitudinal  mechanical  wave in resonance.
2. think how size , weight,  and  density of particle is differentiated  when exposed  to longitudinal  mechanical  wave in resonance.
- process it  in your brain and you are the winner.
-look in my previous  post what I meant by word winner.
Wesley

[lukaszkwiatkowskii]

To jak masz dwa mikroskopy elektronowe to jednym możesz produkować układy scalone metodą litografii bez-maskowej (maskless lithography) a dokładniej "Electron-beam lithography".

[kolbacict]

 What(Who) is it ?
a drunkard lie under your table?
The second picture is already gone ...

Of course  you can't hear it.
the difference between 20kHz and 21kHz is 1kHz but  frequency  of this 1kHz is still  in bandwidth your hearing  is not.

And why are there no beats in the air in the room between these frequencies?
With a difference frequency of 1 kHz?
Why, in an electrical circuit, this happens when two electrical signals are mixed, but not in the case of acoustic waves?

To jak masz dwa mikroskopy elektronowe to jednym możesz produkować układy scalone metodą litografii bez-maskowej (maskless lithography) a dokładniej "Electron-beam lithography".

You can do both at once.

[stivep]

What(Who) is it ?
a drunkard lie under your table?
The second picture is already gone ...

humoristic: use of two words that when spoken sounds the same but    when written the are different.
difference-between-lay-and-lie https://askanydifference.com/difference-between-lay-and-lie/

I'm not sure what you are alluding to?
are you questioning that we have not  one but two LEO 435VP?
We have  two units of  LEO 435 VP and in addition to it  we actually have the third one too, but is not working at the moment.

__________________________________________________
One uses Liquid  nitrogen and the other is not.
the two pictures from the comment on the top that shows the same very microscope in the same very room.
One of the pictures shows slightly  separated main unit from its electronics and my jacket on the floor.
so I can lie down while checking connections. :)pictures: LEO 435 VP and  LEO 435 VE shows the same unit.
and nothing is gone.
https://overunity.com/17735/wesleys-kapanadze-and-other-fe-discussion-forum/msg561594/#msg561594
_______________________
so where is the lie? lye ?

Below this comment  you have set of  two pictures of  my two different working units.
The  LEO 435VP  on the second picture  named  LEO 435 unit# 2 is in different room and it has  Liquid nitrogen dewar on it.

Scanning electron microscope (SEM)
Resolution: 4 nm
Computer controlled stage: 5-Axis
Specimen chamber.
EDXRF or EDS  Energy Dispersive X-ray  Spectroscopy.

Energy dispersive X-ray spectroscopy (EDS or EDX) is a chemical microanalysis technique used in conjunction with SEM.
The EDS technique detects X-rays emitted from the sample during bombardment by an electron beam to characterize the
elemental composition of the analyzed volume. Features or phases as small as 1 µm or less can be analyzed.

https://www.sciencedirect.com/topics/engineering/energy-dispersive-x-ray-spectroscopy
some helpful videos:
https://www.youtube.com/watch?v=SdpXFcf_La0&t=926s
https://www.youtube.com/watch?v=kOJGZJa3cZg&t=164s
https://www.youtube.com/watch?v=xlXEP5yONA0&t=20s
https://www.youtube.com/watch?v=vBu9Xzc1TgE
https://www.youtube.com/watch?v=eOPS2AAUwOU





I used it also to analyze ferrite composition from Russian  TV Rubin used in number of  FE experiments.
Wesley

[stivep]

And why are there no beats in the air in the room between these frequencies?
With a difference frequency of 1 kHz?
Why, in an electrical circuit, this happens when two electrical signals are mixed, but not in the case of acoustic waves?
You can do both at once.

There will be none.Every microphone has different  frequency range and different sensitivity
The two longitudinal waves must have the same frequency and be opposite in face and equal in amplitude( magnitude) at that given point  you are at, to cancel
itself, but the effect will be valid only for  the particular point  the observer is at.
When you or your microphone  moves  left right you and your microphone will not hear cancellation .

If you have two different frequencies of longitudinal wave  you'll not  be able to  mix them together  unless you receive the tones and in form of electrical signal
mix them in  mixer.
You can't base on  article in Russian  language  as it was written by an analphebet (illiterate.) person in physics.
The Russian made his own comments to  this  article:
BackDoor: Making Microphones Hear Inaudible Sounds Nirupam Roy, Haitham Hassanieh, Romit Roy Choudhury University of Illinois at Urbana-Champaign
https://nsr.cse.buffalo.edu/mobisys_2017/papers/pdfs/mobisys17-paper01.pdf
and everything is explained in it:
I'm reading it now . If I  find anything wrong in it I'll definitely note it here.


Wesley