4) Short time anneals are very useful for limiting diffusion. What method is used to heat the wafer very rapidly (100 oC/sec or more)?
Rapid thermal annealing method is used at low temperatures to avoid diffusion .
At high temperature diffusion may occur so to avoid that RTA method is used. This method the material is rapidly cools down,thus diffusion will not occurs.
4) Short time anneals are very useful for limiting diffusion. What method is used to heat...
Diffusion is rapid over very short distances, and slow over longer distances. The time, t in seconds, required for diffusion is given by the equation t = d2/D where d is the distance in meters a molecule diffuses, and D is the diffusion coefficient (units: m2/sec) of the diffusing molecule. For a small molecule with a D of 2.2 × 10-9 m2/sec, how long would it take for this molecule to diffuse across a spherical cell with a 22.9 μm...
What is generally seen as a strong advantage of the time series forecasting method? a. Economic recessions and competitor actions can cause sales figures to rapidly change b. Dynamic market forces can cause trends to change, which can affect time series forecasts c. Used as a “sanity check” to confirm accuracy of more sophisticated forecasting methods d. Short-term fluctuations (noise) can be present in the raw sales data
What is generally seen as a strong advantage of the time series forecasting method? a. Economic recessions and competitor actions can cause sales figures to rapidly change b. Dynamic market forces can cause trends to change, which can affect time series forecasts c. Used as a “sanity check” to confirm accuracy of more sophisticated forecasting methods d. Short-term fluctuations (noise) can be present in the raw sales data
Bacterial cells are grown in 35S for a very short amount of time. What are the expected results? a. no labeling b. labeling on one side of origin c. labeling on both sides of the origin d. labeling only the origin
life are used to depreciate a 23. MACRS, Realty. (Obj. 1) What depreciation method and useful life are used to home office placed in service in 2019? Explain.
Effect of Molecular weight on Diffusion Time (Minutes) 0 10 20 30 40 50 60 Percent increase Methylene Blue 14.022.0125.0 20.0 20.-22 -100 9.0|14.0/16.0 18.0 /19.0/19.000122.221 Potassium Permanganate According to your data, what molecule (methylene blue or potassium permanganate) diffused the fastest? Check Your Understanding 1.1 Based on the data, what generalization can be made about the relationship between diffusion rate and molecular weight? 1.2 By observing the rate of diffusion from the data collected, does diffusion rate change over...
A lightning bolt may carry a current of 1.00 Times 10^4 A for a short time. What is the resulting magnetic field 200 m from the bolt? Suppose that the bolt extends far above and below the point of observation. Your response differs from the correct answer by more than 100%. MuT
4. Refrigeration and air conditioning is quite useful, but it is, in effect, a way to move heat from a low temperature to a high temperature. Is this possible, given the second law? Answer the following questions below, for R-134a (a common refrigerant), and then state whether you believe refrigeration violates the second law, and why (or why not) a. R-134a arrives to the inside of the refrigerator that you are trying to keep cooled to T- 4°C. The air...
(a) A data link with a 1 Gigabits/sec capacity is used to transmit packets made up of 1400 bytes of data and 100 bytes of protocol control information. Each packet is acknowledged by a short frame of size 150 bytes. The propagation speed in the transmission medium is 200,000 km/sec. Consider the buffering and processing time in the nodes to be negligible. A node A communicates with a node B, with a distance between nodes A and B of 16...
(LMTD method) A 2 shell, 4 tube pass heat exchanger is being
used to heat 40 kg/s of a process fluid in the tubes from an inlet
temperature of 15°C to a target temperature of 70°C using
condensing steam at 150°C. The overall heat transfer coefficient
for a clean heat exchanger was Uo=1500W/m2.°C, however, the design
engineer neglected to take into account fouling of the heat
exchanger. After 5 years of use, fouling has occurred with fouling
factors of 0.0005m2.°C/W...