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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?
The time has come for XelPharm to expand. The board of directors has purchased another warehouse for a second distribution facility. It's located in an industrial area, about eight miles from the company's headquarters.
Determine the reservation table
A particle travels along the x-axis with postion ( measured in meters ) as a function of time ( measured in seconds ): x(t) = 5t^2-7t+2. (a) At what time or times is the particle at rest
Find an interesting (yet simple) circuit (LED flasher, battery charger, audio vu meter, etc.) on the internet and explain (as best as possible) how the circuit works. How does it utilize diodes, resistors, capacitors, transformers.
The solutions to Schrodinger's wave equation for a particular situation is given by Psi(x) = sqrt(2/ao)*e-x/ao. Determine the probability of finding the particle between the following limits: (a) 0
A 5-MVA, 66:13.2kV, three-phase transformer supplies a three-phase resistive load of 4,500kW at 13.2kV. What is the load resistance in ohms as measured from the line-to-neutral on the high-voltage side of the transformer, if it is connected in Y
what is the difference between the words "rated as 3mA" , and "biased at 5mA" , when talking about a diode what is teh difference between saying " the diode is rated as a 3mA device", and " The diode is biased at a current of 0.5mA"
Find the transfer functions, seros, and poles for the following systems:a. (D^2+10D+24)y(t)=(5D+3)f(t)b. (D^2+4D)y(t)=(3D+2)f(t)
Calculate the minimum PWM frequency for a small permanent magnet DC motor with a time constant of 15 milliseconds.
a.Sketch the circuit diagram, the impedance diagram and the phasor diagram; take the supply voltage V as the reference phasor. b. Calculate the magnitude of the voltage V2 across the second impedance. c. Calculate the magnitude of the voltage V3 acro..
a) Calculate alpha, omega-sub-delta, and omega-sub-zero. b) write the equation which describes the current i for t>0. c) determine the maximum value of i, and the time at which it occurs, if the inductor initially stores no energy and v(0-)=9V.
when the line was open-circuited, the measurement yielded an input impedance equivalent to a capacitor with capacitance of 40 pF. Find Zo of line, the phase velocity, and the relative permittivity of the insulating material.
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