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Επικοινωνία

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7/3/2017, 20:00

European Dissidents ALARM

 

Cavitation damage

 

Μοναδική λύση, το Χόλιγουντ

 

Charlatans

 

Zeppelin: Beyond Gravity

 

Foreign intervention in Greece?

 

Η ανελεύθερη Ελλάδα

 

Η Ελλάδα καταγώγιο;

 

Αν.Επ. Π. Παυλόπουλο

  

Intangible prisons

 

Plausible deniability

 

Images of German w & s

 

Crimes against Humanity

 

"Chimera" - "Bellerophon"

 

pr. Donald Trump

 

  

Legal Notice 87

 

Βδέλλες, αποικιοκρατικές

 

Being a German

 

Legal Notice 84

 

Dirty colonial methods

 

Georgi Markov, BG - KGB

 

Samples of Barbarity

 

Ελλάδα - αποκόλληση

 

Έλληνες, στο έλεος...

 

Harvester's log 16/3/17

 

 

Legal Notice 66

 

Execrable

 

Legal Notice 62

 

  

My story

 

  

Aggression?

 

  

Η Εστία μου

 

  

Why so untidy?

 

  

Αποικιοκρατία

 

  

Εξόντωση Ελλήνων αντιφρονούντων;

 

  

Ζήτημα εμπιστοσύνης

 

  

Μεθοδικότητα

 

  

Ανοικτή Επιστολή πρέσβη ΗΠΑ

Αφορμή, U2RIT vs Ελλάδα;

Βιοηθική

A request to U2RIT

Colonial aggression - 2

Open Letter to UN S.G.

Open Letter to p.C. & p. O.

Δήλωση πρόθεσης επαναπατρισμού

 

Ο "εφιάλτης" της Νυρεμβέργης

Συλλογή Φωτογραφιών

Αίτημα προστασίας, προς Ιταλία

Chroma key, background removal

Science and Ethics

Να συμβάλει και η U2RIT

Θα ξαναφτιάξουν πολλές φορές Άουσβιτς και Zyclon B

 

Split-Screen effect

Η Ζωή είναι Ωραία.

Βόρεια Κορέα

Λευτεριά στους Έλληνες, εξανα- γκαστικά "Εξαφανισμένους"

 

Μυστικές δίκες;

Trustworthiness

Πολιτισμό, ή, απληστία;

Ακραία Στυγνότητα

Η Τέχνη της Επιβίωσης

Political Asylum 3

Επιστροφή στις ρίζες

The Human Cost of Torture

An urgent appeal for solidarity

More obvious than the Sun

Western "culture"

Political Asylum

Έννομη Προστασία

Μια μήνυση που εγείρει ερωτηματικά

 

 

 

Honor your father...

Noise

Creative Greeks

A pair of Dictatorships

Cavitation damage (updated) PDF Εκτύπωση E-mail
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ΧείριστοΆριστο 
Deutsche Militärverteidigung - Bundeswehr
Συντάχθηκε απο τον/την Χρήστος Μπούμπουλης (Christos Boumpoulis)   
Κυριακή, 26 Νοέμβριος 2017 19:39

 

25KHz-100W-110V-Ultrasonic-Generator-PCB-Circuit.jpg

 
 Ultrasonic Signal Generator Circuit – Beijing Ultrasonic
www.youtube.com/watch?v=A9JdQN5e5G8
  

Ultrasonic soldering

https://www.youtube.com/watch?v=sI_xtZLuvIo


video ultrasonic soldering System

www.youtube.com/watch?v=ZvJ5355jKz4


Cavitation damage
Cavitation is, in many cases, an undesirable occurrence. In devices such as propellers and pumps, cavitation causes a great deal of noise, damage to components, vibrations, and a loss of efficiency. Cavitation has also become a concern in the renewable energy sector as it may occur on the blade surface of tidal stream turbines.
When the cavitation bubbles collapse, they force energetic liquid into very small volumes, thereby creating spots of high temperature and emitting shock waves, the latter of which are a source of noise. The noise created by cavitation is a particular problem for military submarines, as it increases the chances of being detected by passive sonar.
Although the collapse of a small cavity is a relatively low-energy event, highly localized collapses can erode metals, such as steel, over time. The pitting caused by the collapse of cavities produces great wear on components and can dramatically shorten a propeller or pump's lifetime.
After a surface is initially affected by cavitation, it tends to erode at an accelerating pace. The cavitation pits increase the turbulence of the fluid flow and create crevices that act as nucleation sites for additional cavitation bubbles. The pits also increase the components' surface area and leave behind residual stresses. This makes the surface more prone to stress corrosion.
 
Ultrasonic cleaning is a process that uses ultrasound (usually from 20–400 kHz) and an appropriate cleaning solvent (sometimes ordinary tap water) to clean items. The ultrasound can be used with just water, but use of a solvent appropriate for the item to be cleaned and the type of soiling present enhances the effect. Cleaning normally lasts between three and six minutes, but can also exceed 20 minutes, depending on the object to be cleaned.
Ultrasonic cleaners are used to clean many different types of objects, including jewelry, lenses and other optical parts, watches, dental and surgical instruments, tools, coins, fountain pens, golf clubs, fishing reels, window blinds, firearms, car fuel injectors, musical instruments, gramophone records, industrial parts and electronic equipment. They are used in many jewelry workshops, watchmakers' establishments, and electronic repair workshops.
 
Brain shrinkage seen on MRI imaging may actually occur up to 10 years before Alzheimer’s disease is diagnosed, finds a new study in Neurology.
“This measure is potentially an important imaging marker of early changes in the brain associated with Alzheimer’s disease that could help predict who might develop the dementia associated with this disease and possibly even how long it would be before dementia develops,” says study researcher Bradford Dickerson, MD, a neurologist at Harvard Medical School in Boston, in a news release. “These are preliminary results that are not ready to be applied outside of research studies right now, but we are optimistic that this marker will be useful in the future.”
About 5.4 million people in the U.S. have Alzheimer’s disease, a progressive brain disease that leads to a decline in memory and other cognitive abilities. It is the most common form of dementia, according to the Alzheimer’s Association.
There is no single test that can diagnose Alzheimer’s, but an early diagnosis could lead to more therapeutic opportunities.
 
A couple of, a 20 KHz 100W 110/220v ultrasonic Generator Circuit with a 20KHz 100W ultrasonic cleaning transducer can be found in the market worth 66 USD.
 
Above, there is raw technical information for further research.
 
Christos Boumpoulis
economist
 
P.S.: Those, who may cook alive, healthy, sane, honest and legitimate civilians, exclusively, for political reasons and under the illegitimate cover-up of enlisted charlatans, are, according to my opinion, nothing else but nearly-men and quasi zombies.
 

    


Τελευταία Ενημέρωση στις Τετάρτη, 29 Νοέμβριος 2017 18:02