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Optical damage considerations and the study of SBS. The threshold intensity for optical damage to fused silica is approximately 3 GW/cm2 and is of the same order of magnitude for most optical materials. (See, for example, Lowdermilk and Milam, 1981.) Use this fact and the value of the SBS gain factor at line center quoted in Table 9.3.1 to determine the minimum length of a cell utilizing fused-silica windows that can be used to excite SBS in acetone with a collimated laser beam. Assume that the laser intensity is restricted to 50% of the threshold intensity as a safety factor to avoid damage to the windows. If the laser pulse length is 20 nsec, what is the minimum value of the laser pulse energy per unit area that can be used to excite SBS? (SBS is often excited by tightly focused laser beams rather than by collimated beams to prevent optical damage to the windows of the cell
what are the possible combinations of inflow and outflow of water in the tank in a given day. if the water level in the tank is 7ft from the bottom at the start of day, what are the possible water levels in the tank at the end of the day.
Three shafts and four gears are used to form a geartrain which will transmit 7.5 kW from the motor at A to a machine tool at F. (Bear- ings for the shafts are omitted from the sketch.) Knowing that the frequency of the motor is 30 Hz
Air enters an adiabatic nozzle steadily at 300 kPa, 200 o C, and 30 m/s and leaves at 100 kPa and 180 m/s. The inlet area of the nozzle is 80 cm 2 . Determine (a) the mass flow raw through the nozzle, (b) the exit temperature of the air, and (c) the ..
Water flows from a ground storage tank that is 450 feet above a town's water distribution system. The pressure at the entrance of the system must be at least 75 psi and the demand is 1350 GPM.
We have a small wood deck, 8' by 8' This deckshould only have a max of five adults on it. Oneside of deck is attached to the wall of the house, and out fromthis wall is two post six feet from the wall. Problem is the load bearing strength of the be..
Write a computer program that generates a sequence of random variables from a normal distribution with mean 5 and standard deviation 2.
A 50-kg crate is pulled by the constant force P at an angle of 30 deg off the x axis- the crate starts from rest and achieves a speed of 10 m/s in 5 s. the coefficient of kinetic friction between the crate and ground is 0.2.
the If the probability that fluorecent light has a useful life of at least 500 hours is 0.85, find the probabilities that among 20 such lights (a) 18 will have a useful life of at least 500 hours;
An open channel has a vee shaped cross section with sides inclined at an angle of 60o to the vertical. If the rate of flow is 80 dm^3 s^-1 when the depth at the centre is 0.25 m, what must be the slope of the channel assuming Chezy's constant is 45..
Land is extremely valuable in this area therefore to win this job you need to consider innovative approach to reduce the waste areas
For a concrete column that is part of a braced frame, if the column is square, tied, 18 inches per side, 16 feet long, classify the column as slender or non slender
Determine the mean effective pressure of an ideal Otto cycle that uses air as the working fluid. At the beginning of compression the pressure is 14 psi and the temperature if 60°F.
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