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Cooling High-Powered Silicone Chips Timothy L. Hoopman of the 3M Corporation described a novel method for cooling high-powered-density silicone chips (D. Cho et al., eds., Microchanneled Structures in DCS, Vol. 19: Microstructures, Sensors, and Actuators, ASME Winter Annual Meeting, Dallas, Texas, November 1990). This method involves etching microchannels in the back surface of the chip. These microchannels typically have hydraulic diameters of 10 µ to 100 µwith length-to-diameter ratios of 50-1,000. Microchannel center-to-center distances can be as small as 100 µ, depending upon geometry.
Design a suitable microchannel cooling system for a 10-mm x 10-mm chip. The microetched channels are covered with a silicone cap as shown in the schematic diagram. The chip and cap are to be maintained at a temperature of 350 K and the system has to remove a heat flux of 50 W/cm2. Explain the reason why microchannels, even in laminar flow, produce very high heat transfer coefficients. Also, compare the temperature difference achievable with the microchannel design with a conventional design using water-forced convection cooling in a channel covering the chip surface.
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Consider the leading term of the polynomial function. What is the end behavior of the graph? Describe the end behavior and provide the leading term.
Identify the recovery option you would use for your provided example, and provide a rationale for its selection.
Describe the role of the DOT in ensuring the safety of hazardous materials.
Write a C program that calculates the change due to a customer by denomination; that is, how many pennies, nickels, dimes, etc. are needed in change. The input is to be the purchase price and the size of the bill tendered by the customer ($100, $5..
Nick is chief engineer in a phosphate fertilizer plant that generates more than 1 million tons per year of gypsum, a waste collected in a nearby pile. Over many years, the pile has grown into a mountain containing 40 million tons of waste. There i..
You are a new IT security professional for a small police department. At first you did not see your agency as being a large target for attacks. However, the city recently appointed a new and very controversial police chief.
Design an application that declares an array of 10 HousePlants. Prompt the user for data for each of the HousePlants, then display all values.
What is an index? Compare the concept of the index in a book to an index in an information system.
Do you think many organizations use critical path analysis? What about critical chain scheduling? Justify your responses.
From the first e-Activity, explain the key ways that your researched tools can be utilized in a Windows environment. Additionally, indicate which of these tools you would consider to be the most useful for systems administrators. Provide a rationa..
Which of the following condition is used to transmit two packets over a medium at the same time?
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