Ultrasonics are sound waves with frequencies above 20khz.
GALTON WHISTLE
First they were produced by Galton.He called his Instrument the galton whistle.It consisted of a brass tube 2 mm in diameter and it was operated by blowing in a jet of high pressure gas.it consisted of a piston.on moving it the resonant cavity's length varied,on varying the length the resonant frequency too varied.Thus the resonant frequency depends on the length of the tube/pipe.But this could produce only up to 30khz.
MAGNETOSTRICTION METHOD
the main principle for this method is when a ferromagnetic rod made of material like iron or nickel is subjected to alternating magnetic field applied parallel to the rod,there will be a small elongation or contraction in its length.this change in length is proportional to the intensity of the magnetic field and nature of the ferromagnetic material.
so the length of the rod changes for each half cycle of the alternating current which means the frequency will be twice the frequency of alternating current..
when the natural frequency of the rod matches with the frequency of the alternating current resonance occurs and amplitude will be maximum and ultrasonic waves are produced.In this method frequencies up-to 300KHZ can be produced.
PIEZOELECTRIC OSCILLATOR
The main principle of this is the inverse piezoelectric effect..according to the piezoelectric effect,when one pair of opposite faces of a crystal like quartz is subjected to pressure the other pair of opposite faces will develop electric charges and if the pressure is replaced by tension then the charges will be reversed..the inverse of this effect is that if the pair of opposite faces are subjected to alternating voltages then the other pair of opposite faces varies in its dimensions,i.e. it expands or contracts periodically thus generating elastic waves.When the natural frequency of the crystal matches with the frequency of the alternating current,resonance occurs and ultrasonic waves are produced.In this method frequencies upto 500MHZ can be produced.
Which of the following methods of computing depreciation is production based?A. Straight-line.B. Declining-balance.C. Units-of-activity.D. None of these.Ans: C. Units- of- activity
Lean Production is a well consolidated style of production, mostly related to the Manufacturing Industry.Lean Production is often called Lean Manufacturing.In a nutshell:Lean Production is "lean" because it has no "fat", where fat is "waste". Therefore Lean Production is synonymous with "waste-less" production.Why is it important?Because Lean Production is a primary target for today's manufacturing industry: for survival, competitiveness and excellence.Lean Production uses much less space - takes much less time - originates much less errors and defects - consumes much less resources - and satisfies customers much more compared to traditional "mass production" (batch production - lot production).
§Identify the different methods of accessing information on the web
importance of product flow
all of the above
Sonobond Ultrasonics was created in 1960.
Ultrasonics is the science of sound. Ultrasonics are usually used to detect items and measure distance. It is often used in the vetrinary and human medical field.
Benson Carlin has written: 'Ultrasonics' -- subject(s): Ultrasonics
The five methods of production processes are job production, batch production, mass production, continuous production, and custom production. Each method is suited for different types of products and production volumes.
Sounds which have frequency greater than 20,000Hz are inaudible to human ears are called ultrasonics.
Satya Prakash has written: 'Ultrasonics and colloids' -- subject(s): Colloids, Ultrasonics
Patricia Chudleigh has written: 'Obstetric ultrasound' -- subject(s): Diagnosis, In pregnancy, Methods, Pregnancy Complications, Prenatal diagnosis, Ultrasonic Diagnosis, Ultrasonics in obstetrics, Ultrasonography
Oluwakemi O. Ola-Ojo has written: 'Obstetrics and gynaecology ultrasound' -- subject(s): Diagnosis, Diseases, Examination questions, Female Generative organs, Female Genital Diseases, Methods, Pregnancy, Pregnancy Complications, Prenatal Ultrasonography, Ultrasonic imaging, Ultrasonics Diagnosis, Ultrasonics in obstetrics, Ultrasonography 'Obstetric and Gynaecological Ultrasound'
To change to industrial methods or to adapt to methods of production and manufacturing like to change.
Ultra
the two meathod to increased the food production are: 1)to incra
Mass production methods that lowered their cost.