ultrasonic alarm - ορισμός. Τι είναι το ultrasonic alarm
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Τι (ποιος) είναι ultrasonic alarm - ορισμός

PROCESS THAT USES ULTRASOUND AND A CLEANING SOLVENT TO CLEAN ITEMS
Ultrasonic bath; Ultrasonic cleaner; Sonic bath; Ultrasonic agitation; Ultrasonic cleaners
  • Sonorex ultrasonic cleaner from the 1970s or 1980s
  • Ultrasonic transducers showing ~20 kHz and ~40 kHz stacks.  The active elements (near the top) are two rings of [[lead zirconate titanate]], which are bolted to an aluminium coupling horn.
  • Ultrasonic cleaning of a mobile phone

Ultrasonic nozzle         
  • High Temperature Ultrasonic Nozzle
Ultrasonic Nozzle
Ultrasonic nozzles are a type of spray nozzle that use high frequency vibrations produced by piezoelectric transducers acting upon the nozzle tip that create capillary waves in a liquid film. Once the amplitude of the capillary waves reaches a critical height (due to the power level supplied by the generator), they become too tall to support themselves and tiny droplets fall off the tip of each wave resulting in atomization.
alarm clock         
  • A traditional wind-up (key-wound), mechanical spring-powered alarm clock
  • A mid-1940s alarm clock radio with AM radio stations only.
  • The [[Obelisk of Theodosius]], detail of the pedestal: [[Theodosius I]] offers laurels of victory; we can see the ''[[water organ]] of [[Ctesibius]]'', in the lower right-hand corner.
  • A modern clock radio features a radio/iPod/buzzer as alarms.
  • Sleeptracker, an alarm clock that tracks sleep phases
  • [[Sony Dream Machine]] ICF C242
TYPE OF CLOCK USED TO WAKE UP A SLEEPING PERSON AT A CERTAIN TIME
Clock radio; Snooze bar; Snooze button; Alarm Clock; Alarm clocks; Alarm Clocks; The Alarm Clock; Clock radios; Clock-radio; ⏰; Cell phone alarm; Time Alarm
n.
1) to set an alarm clock
2) an alarm clock goes off, rings, sounds
Alarm clock         
  • A traditional wind-up (key-wound), mechanical spring-powered alarm clock
  • A mid-1940s alarm clock radio with AM radio stations only.
  • The [[Obelisk of Theodosius]], detail of the pedestal: [[Theodosius I]] offers laurels of victory; we can see the ''[[water organ]] of [[Ctesibius]]'', in the lower right-hand corner.
  • A modern clock radio features a radio/iPod/buzzer as alarms.
  • Sleeptracker, an alarm clock that tracks sleep phases
  • [[Sony Dream Machine]] ICF C242
TYPE OF CLOCK USED TO WAKE UP A SLEEPING PERSON AT A CERTAIN TIME
Clock radio; Snooze bar; Snooze button; Alarm Clock; Alarm clocks; Alarm Clocks; The Alarm Clock; Clock radios; Clock-radio; ⏰; Cell phone alarm; Time Alarm
An alarm clock (or sometimes just an alarm) is a clock that is designed to alert an individual or group of individuals at a specified time. The primary function of these clocks is to awaken people from their night's sleep or short naps; they are sometimes used for other reminders as well.

Βικιπαίδεια

Ultrasonic cleaning

Ultrasonic cleaning is a process that uses ultrasound (usually from 20 to 40 kHz) to agitate a fluid, with a cleaning effect. Ultrasonic cleaners come in a variety of sizes, from small desktop units with an internal volume of less than 0.5 litres (0.13 US gal), to large industrial units with volumes approaching 1,000 litres (260 US gal).

The principle of the ultrasonic cleaning machine is to convert the sound energy of the ultrasonic frequency source into mechanical vibration through the transducer. The vibration generated by the ultrasonic wave is transmitted to the cleaning liquid through the cleaning tank wall, so that the micro-bubbles in the liquid in the tank can keep vibrating under the action of the sound wave, destroying and separating the dirty adsorption on the surface of the object.

Depending on the object being cleaned, the process can be very rapid, completely cleaning a soiled item in minutes. In other instances cleaning can be slower, and exceed 30 minutes.

Ultrasonic cleaners are used to clean many different types of objects, including jewelry, scientific samples, lenses and other optical parts, watches, dental and surgical instruments, tools, coins, fountain pens, golf clubs, fishing reels, window blinds, firearm components, car fuel injectors, musical instruments, gramophone records, industrial machine parts, and electronic equipment. They are used in many jewelry workshops, watchmakers' establishments, electronic repair workshops, and scientific labs.