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Comparing the PML grading. Write a 2D FDTD simulation with the split- field PML, similar to the example in Section 9.2.3. Use the same parameters as the example, i.e., ?x = ?y = 5 cm in a space of 6 × 3 m. Excite a sinusoidal source at the center of the space with f0 = 600 MHz, and grade the PML with a polynomial of order 4 and R(0) = 10-6. Measure the reflections by comparing the field amplitude at a particular snapshot in time at a location just inside the PML.
(a) Modify the parameters of the polynomial grading, in particular the order m, between 3 and 4 (it need not be an integer). How does this affect the reflections? What m gives the lowest reflections? (b) Now implement the PML with a geometric grading, choosing appropriate parameters g and σx,0 according to Equations (9.35). Compare the results to the polynomial grading. Experiment with the effect of the parameter g on the PML performance.
a 4A current source is in parallel with a 30 ohme resistance, a 15 ohme resistance, and an unknown resistance, Rx. The current through the unknown resistance is 1A. Determine the value of Rx.
Determine the volumes of each of these semiconductors that will on avg contain one hole. The intrinsic carrier concentrations are ni=1.02*10^10 cm^-3,ni= 2.1*10^ cm^-3, and 10^-7 cm^-3.
Devise a purely electronic means for measuring the amplitude of the frequency-shifted signal, using only a PIN photo detector.
Estimate the reactor cooling requirement for a plant that produces 20,000 metric tons per year (20 kt/y) of acrolein if the reactor is operated isothermally.
A 15 hp, 209V,three-phase,six pole, Y-connected induction motor has the following parameter values per phase: R1= 0.128 ohm, R'2=0.0935 ohm Xeq- X1 + X'2 = 0.49 ohm. The motor slip at full load is 3%, and the efficiency id 90%.
A differential amplifier has a bias current of 100 n A, a maximum offset current of 20 n A, a maximum offset voltage of 2 mV, an input resistance of 1 MΩ, and a differential gain of 1000. The input terminals are tied to ground through (exactly equ..
A standard D cell flashlight battery is connected to a load of 3 Ω. After 6 hr of intermittent use the load voltage drops from an initial 1.5 V to a final useful voltage of 0.9 V.
cand the efficiency of the transformer.
The converter canreceive signals from 0 V to 5.0V. Design the electronic processorthat must be connected between the sensor´s output and thecomputer´s converter A/D input; so that maximum sensibility is obtained. Justify each single proposal you m..
Briefly summarize the main results of the paper and the main conclusions of the paper. Is this mainly an experimental paper (where real, physical measurements are the main results of the paper), or a theoretical paper (where the main results are f..
given two single pole switches write a program that will turn on an output when both switch a and b are closed. and
Given two NMOS FETs having (kn'/2)(W/L) = (3 KW)^-1 and Vt = 3V. Using a single 10V dc power supply, design a differential pair amplifier having 1mA bias current in each transistor. What is its maximum gain for linear operation (balanced input, ba..
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