Ultrasound instruments which are also known as sonographic instruments operate by using high frequency sound waves. These sound waves operate using a frequency range of 1 to 18 megahertz that can be used for imaging. These high-frequency sound waves are out of range of human hearing. The lower frequency of the sound waves produce less resolution but can produce images deeper into the human body. Higher frequency sound waves are capable of reflecting or scattering from smaller structures but are limited
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Ultrasound Quick Project Ultrasounds are sound waves with frequency beyond the human limits‚ therefore humans are unable to hear them. It even travels at exactly the same speed as sound in any medium. Humans can hear sound within the frequency range of about 20 to 20‚000 Hz‚ so any sound above 20 kHz is ultrasound. Ultrasound or ultrasonography is a medical imaging technique that uses high frequency sound waves and their echoes. The technique is similar to the echolocation used by bats‚ whales
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impedance matching on the interface between electro-acoustical transducer and electrical transmitter has been the most important subject to confirm the high transmitting efficiency. Because the impedance of a wide band transducer depends on signal frequency‚ it is difficult to design a matching network between power amplifier and the transducer for maximum power transfer. A novel method is proposed to attain the goal in which‚ impedance matching is achieved by designing a lumped network. The values
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INTRODUCTION Load frequency control (LFC) or Automatic generation control (AGC) is an emerging issue in electric power systems. The objective is to maintain the system frequency and the power exchange between the areas within specified limits‚ irrespective of sudden change in load. The prime mover governing system provides a means of controlling power and frequency; and this function commonly called Load Frequency Control or Automatic Generation Control. The automatic load frequency control (ALFC) loop
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International Journal of Mechanical Engineering and Technology ENGINEERING – INTERNATIONAL JOURNAL OF MECHANICAL (IJMET)‚ ISSN 0976 6340(Print)‚ ISSN 0976 – 6359(Online) Volume 3‚ Issue 3‚ Sep- Dec (2012) © IAEME AND TECHNOLOGY (IJMET) ISSN 0976 – 6340 (Print) ISSN 0976 – 6359 (Online) Volume 3‚ Issue 3‚ Septmebr - December (2012)‚ pp. 214-228 © IAEME: www.iaeme.com/ijmet.html Journal Impact Factor (2012): 3.8071 (Calculated by GISI) www.jifactor.com IJMET ©IAEME DESIGN AND DEVELOPMENT
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measuring tape The width of the study area was measured The slope of the beach was measured with a clinometers Pictures were taken together with observations identifying the coastal features The wave height of the study area was measured The wave frequency of the study area was measured using a stop-watch When The study took place on Thursday 15th May‚ 2014 from 8:30am-2:00pm at the Las Cuevas Bay‚ North Trinidad. This date and time were more convenient to students. The period in which this study
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mechanical system is involved. The vibrations involved at in these places will of high frequency. There will some places where the vibrations of lo0w frequency will be present which will also disturb the normal operation of the system or faultiness in the values measured by the system. These low frequency vibrations are mostly involved in the machinery used in the fields of medicine. So‚ depending on the frequency of vibrations they may be desirable for some applications like mobile phones and they
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The concept of resonance was the broad general idea that enlightened this particular lab. A natural vibrating frequency occurs when a tuning fork vibrates after a student struck the tuning fork. When a tuning fork is struck and placed near the column of air‚ it creates a standing wave. A resonance is created when the frequencies of tuning fork and the column of air are equal to each other. For the resonance to occur‚ the distance between the top of the tube and the water must be either ¼ of the wavelength
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low-pass filter (see Figure 2). If the switching rate is periodic‚ then the time it takes for a full switching cycle Tswc is given by ! T ≡ T +T ! swc on off (1.1) where Ton is the time the switch is on and Toff is the time that it is off. The frequency or rate of ! ! switching is f swc = 1 1 = Tswc Ton +Toff (1.2) ! To automate and keep the switching periodic‚ an algorithm was written and implemented
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Sound and music are parts of our everyday sensory experience. Just as humans have eyes for the detection of light and color‚ so we are equipped with ears for the detection of sound. We seldom take the time to ponder the characteristics and behaviors of sound and the mechanisms by which sounds are produced‚ propagated‚ and detected. The basis for an understanding of sound‚ music and hearing is the physics of waves. Sound is a wave which is created by vibrating objects and propagated through a medium
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