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An L x L square transducer, submersed in water, is centered at the origin and is pointed down the +z-axis. A larger layer of homogeneous fat begins z=z0 and extends to the depth of penetration, so that the only possible returns are those of the interface between water and fat. The transducer is capapble of rotating towards the x-axis by θ degrees. Assume that ther is no attenuation in the water. Assume that the transmitted pulse is a gated sinusoid of duration T and height A0. a) Assume the z0 is in the far field and derive an expression for the strength to return as a function of angle. Make approximations where appropriate and do not forget the sidelobes. b) Assume that the transducer and preamplifier are able to detect signals 80 dB down from the transmitted pulse height. Assume also that a B-mode binary image is generated so that all signals above the detectable threshold are plotted in black and all signals below the threshold are plotted in white. Sketch the B-mode image that would result from this experiment.
Design a current divider that provides a 1:2 current split. Observe the current and power limitations as in the previous item. Another design constraint is that inserting current meters to measure the current division ratio must not upset this rat..
A 110-V rms, 60-Hz source is applied to impedance Z. The apparent power entering the load is 120 VA at a power factor of0.707 lagging. (a) Calculate the complex power. (b) Find the rms current supplied to the load.
A voltage source Vs = 10 Cos(10^3t - 90 degrees) v, a resistanceFind the max instantaneous power delivered by the source, dissipated by R, and absorbed by L. What are the smallest instants (t > 0) at which these maxima occur.
one of a handful of planned air car models can hit 68 mph and has a range of 125 miles. it will take only few minutes to refuel at gas station equipped with costume air compressor unit. it should cost around $2 to fill the car's carbon-fiber tanks..
A bar magnet is cut into 2 parts ,one part is kept over the other so that the pole c2 is above c1. IF M is magnetic momentof the magnet. What will be magnetic moment of the combination
an induction motor when connected in delta and started direct on line produces a starting torque of 60Nm and consumes 80A. if the same motor is started using the soft start equipment with the voltage set at 0.8 of the line
Suppose you want to use external components to configure a comparator in order to provide hysteresis for the input. Show how you would configure such a comparator with hysteresis input.
An IS-95 CDMA DSSS with QPSK modulation system and assuming K = 20 users sharing the same 1.25MHz channel, if the maximum Eb/No of 7.8 dB is provided for each user and the PN code lengths are 32,678 chips ( 2E+15).
a). Determine the power this amplifier will deliver to a 4 ohm load, to an 8-ohm load, and to a 1K-ohm load b). What would be the open-circuitvoltage of the amplifier if the signal level were increased
An n-bit Gray code is a way to encode numbers 0, 1, ..., 2n-1 in binary such that any two consecutive numbers (including 0 and 2n-1) differ in exactly one bit. For example, {00, 01, 11, 10} is a 2-bit Gray code, and {00, 10, 11, 01} is the only ot..
Do this using for loops. For your first prompt you will enter the number N of integers that will follow, then you will be prompted for each integer. Compute the sum and average and provide the output. Do it 3 times using the Matlab, Python, C++
The trees can be harvested early at reduced yield: the net profit is then $250T per $1,000 initial investment, for T in years. To the nearest whole year, at what T is the rate of return largest
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