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If the sides of the mask window make an angle of 45o with the directions, determine the length of the side of the pyramid after finishing the etching.
If the natural frequency of the original bell is fp, find the natural frequency of an n - fold increased model that is geometrically similar to the original.
He returns to Earth with the giant and puts it in a cage. By dimensional analysis, describe what happens to the giant ant.
If silane (SiH4) flow in a single-wafer (150 mm) PECVD reactor is 5 sccm (cm3 /min), what is the theoretical maximum deposition rate of amorphous silicon?
If the cell area is 1µm2, with a 4 nm oxide as the capacitor dielectric, and the operating voltage is 2 V, calculate number of electrons stored in memory cell.
What is the maximum ingot size that can be pulled before the silicon yields catastrophically? What is the COP density on the wafer surface?
Electronic polysilicon is available with 0.01 ppb phosphorous concentration. What is highest ingot resistivity that can be pulled from such a starting material?
Calculate an estimate for silicon lattice constant from atomic mass and density.
How does the thermal oxide thickness on a phosphorus-doped wafer change with dopant concentration?
If we had an Olympic swimming pool full of UPW, how many droplets of sweat can be dissolved before Na+ and Cl- exceed the specification level of 0.1 ppb?
If there is one monolayer coverage of organic contamination on the wafer, how much is that counted as carbon atoms/cm2?
Etch rate could basically be measured easily by weighing the sample before and after etching. What resolution scale is needed to determine rates for?
What is the best possible resolution in optical contact lithography? Make a graphical presentation of projection lithography resolution versus depth of focus!
What process and materials parameters do you need to know in order to estimate the electron beam heating of a mask plate and resist during EBL?
What is the smallest possible feature size that can be written with a 50 keV electron beam?
Oxygen is soluble into titanium up to 34 atomic%. What will be the thickness of a silicon dioxide film that can be dissolved by a 50 nm-thick titanium film?
Convert all ingredients to pounds (show work) before applying the percentage. Report the percentage; you can do this in decimals.
Assume that a mass concrete structure should not have a temperature difference greater. Determine the maximum temperature of fresh concrete to avoid cracking.
Can you estimate the creep of the same concrete at 28 days under a compressive load of 11 MPa and exposed to 50 percent R.H.?
Compute the energy release rate for the double cantilever beam when loaded by end moments.
A series of experiments on identical specimens of Maxwell material were performed. Discuss the implications of results in practical applications.
Is the compressive strength going to increase? What about the elastic modulus? Please justify your answer.
Assume that the freezing was done carefully and, therefore, did not generated micro cracks. Which concrete will have a higher elastic modulus?
What is roller-compacted concrete? Define mass concrete. What type of cements and admixtures are used for making mass concrete mixtures?
Discuss the two principal problems in radiation shielding. What are the benefits of using concrete as a shielding material?