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A tool used for fabricating semiconductor devices consists of a chuck (thick metallic, cylindrical disk) onto which a very thin silicon wafer (p = 2700 kg/m3 · c = 875 J/kg · K, k = 177 W/m · K) is placed by a robotic arm. Once in position, an electric field in the chuck is energized, creating an electrostatic force that holds the wafer firmly to the chuck. To ensure a reproducible thermal contact resistance between the chuck and the wafer from cycle-to-cycle pressurized helium gas is introduced at the center of the chuck and flows (very slowly) radially outward between the asperities of the interface region.
An experiment has been performed under conditions for which the wafer, initially at a uniform temperature Tw,i = 100°C, is suddenly placed on the chuck, which is at a uniform and constant temperature Tc = 23°C. With the wafer in place, the electrostatic force and the helium gas flow are applied. After 15 seconds, the temperature of the wafer is determined to be 33°C. What is the thermal contact resistance Rt,c (m2 · K/W) between the wafer and chuck? Will the value of Rt,c increase, decrease, or remain the same if air, instead of helium, is used as the purge gas?
Consider the two coplanar conductors (infinitely long wire and the conducting rectangular loop) with the given coordinate system. A current I is flowing on the long wire. 1) Find the induced voltage in the rectangular loop if the loop is stationary..
If vid is 20-mV peak-to-peak sine wave applied in a balanced manner but superimposed on VCM= 0.5 V, what is the lowest value that VDD must have to ensure saturation mode operation for Q1 and Q2 at all times. Assume V1= 0.5 V.
Polyethylene with ?_r = 2.25 is used as the insulating material in a lossless coaxial line with a characteristic impedance of 50 Ω. The radius of the inner conductor is 1.2 mm.
Two pointcharges, Q1 and Q2,are located at (1,2,0) and (2,0,0) respectively. Find the relation between the valuesofQ1 and Q2 suchthat the total force on a test charge atpoint P = (-1, 1, 0) has (a)no x-component, or (b)no y-component.
A house is losing heat at a rate of 4500 kJ/h per °C temperature difference between the indoor and the outdoor temperatures. Express the rate of heat loss from this house per
Sketch the schematic for a RC low-pass filter with a 3 dB cutoff frequency of 500 Hz, i.e., the output at 500 Hz is 1/2 = 0.707 of the filter output at DC. What RC time constant must the filter have
hello dear ltbrgt so i want a high advance research paper title graded index fiber . i want my research includes
Express the field D = ( x + y ) ( x + y ) a)in cylindrical components and cylindrical variables b) Evaluate D at the point where = 2 , = 0.2 , and z = 5, expressing the result in cylindrical and rectangular components.
A solenoid is 25 cm long, 3 cm in diameter, and carries 4 A dc in its 400 turns. Its axis is perpendicular to a uniform magnetic field of 0.8 weber per square meter in air. Using an origin at the center of the solenoid, calculate the torque acting..
In a series RC circuit, R = 5 Ohms and C = 0.1F. The capacitor voltage is 10 volts at t=0. At t=0, a voltage of 4V is applied. a) Determine the total capacitance voltage and capacitance current as a function time after the external voltage is applied..
1) Design inverting amplifier circuits with gains of 1, 10,and 100, and show the component values. 2)Calculate the inverting amp output at each gain setting for V2 is1.0Vpp at 100Hz
The parts of this problem refer to the reflection method of solving real transformer problems: A.What is the value of Zload projected into bus (Region) 2 B.What is the total impedance of bus 2 including the projection
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