control circuit of the EMS‚ where the control circuit inverts the 9v dc into a pulsating wave. The preset level controller is used to vary the frequency of the EMS to low‚ medium and high. The lower the resistance the higher the stimulation‚ the higher the resistance lower the stimulation. The intensity control is used to determine the intensity of the stimulation. The transformer is used to output a sinusoidal wave which varies from (30-60) Vac. The electrodes are generally pads that adhere to the skin
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piezoelectric crystal energy source is that of creating a small motor; such as that used in a reflex camera to operate the auto focus system. These motors operate by vibration. The two surfaces are forced to vibrate at a phase shift of 90 degrees by a sine wave that has been generated at the motors resonant frequency. This forces a frictional force where the two surfaces meet and as one of the surfaces is fixed the other is forced to move. It has been found that piezoelectric crystals that have been embedded
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What exactly is the electromagnetic spectrum? Is a continuous range of wavelengths‚ which includes gamma rays‚ ultraviolet waves and other forms of electromagnetic radiation. How does the issue of scarcity and interference relate to the electromagnetic spectrum? The spectrum is considered scarce because of the limited number of frequencies for operation and two parties cannot broadcast on the same frequency in the spectrum. Interference not only can be caused by broadcasters but by natural phenomenons
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3 x 108 m/s. 6. The frequency of a signal is equal to the reciprocal of the signal’s period (f = 1/p). For a computer with a 2.4 GHz clock‚ what is the clock period? Use metric notation for your answer. 7. The signal shown below is a sine wave as it might be displayed on an oscilloscope. If it takes 40 msec. for the waveform to travel between the points shown by the arrow “B” below‚ what is the frequency of the waveform? 8. Power (in watts) is a certain amount of energy (in joules)
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adjust.between frequency range for 250-450 MHz. 8. It has I/O for single-chip‚ and it is easy to implement (the transmit speed can be up to 20kbps.) 9. Strenghthen the ability of anti-disturbing against mobile phone and improve the shape of decoding waves. KST-RX 806 product technical spec introduction 一.technical parameter: (1) (2) (3) (4) operating voltage: +5VDC operating current: ≤8mA operating frequency: 315MHz- 433.92MHz modulation: ASK superheterodyne (5) receiver sensibility: -115dB
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“Home is a Place to Rest”: Constructing the Meaning of Work‚ Family and Gender in the Korean Middle Class* Yi Eunhee Kim I. Introduction Feminist scholarship since the eighties (e.g. Yanagisako 1979; Yanagisako and Collier 1987; Rapp 1987; Scott 1988; Yi E. K. 1986; Ginsburg and Tsing 1990; Peletz 1994; 1995; Thorne 1992; Weston 1990) has widely criticized the conceptual oppositions of family and work‚ production and reproduction‚ domestic and public‚ as long used in Western social science.
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Dispersion and the speed of light “So far as problems involving light are concerned‚ the electrons (in atoms) behave as though they were held by springs”.Feynman “In a microscopic but otherwise classical analysis‚ the electric field in electromagnetic radiation accelerates electrons held by springs in the atoms of a piece of glass‚ and these accelerated electrons re-radiate in all directions. The observed light is the superposition of the electric (and magnetic) fields of the incoming
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I could see the heat waves swelling off of the sand near the water. The tall water grasses growing a few yards from the beach launch were turning brown and brittle from the constant sun (Woodford). It was supposed to be a hot summer‚ but even I didn’t think it was going to be this sweltering. This was my first job ever‚ and I was so excited to finally have something to do during summer break. I wished I could be out sailing with the other group‚ but right then I had to stay on the beach and do my
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MODULATION TECHNIQUES 1.4.1 FREQUENCY SHIFT KEYING (FSK) Frequency shift keying is a frequency modulation in which the digital information is transmitted by discrete changes in frequency of the carrier signal. This technology is used for the communication system such as caller ID and emergency broadcasts [19]. The binary FSK is the simplest FSK. BFSK uses a pair of discrete frequencies to transmit binary information. The 1 and 0 is mentioned as mark frequency and space frequency. The other forms
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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 or a multiple of ¼ of the
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