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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
An expressway off-ramp consisting of a single lane leads directly to a tollbooth. The rate of arrival of vehicles at the expressway can be considered to be Poisson with a mean of 30 veh/h.
Describe in outline the main markets, activities and services provided by the construction and built environment sector.
A 50-ohm electrical resistor carries a current of 5 amperes. The resistor is maintained at a temperature of 30o C. Determine the rate at which heat must be transferred to the surroundings
A bank is offering to sell 6-month certificates of deposit for $9800. At the end of 6 months, the bank will pay $10,000 to the certificate owner. Compute the nominal annual interest rate and the effective annual interest rate
At the instant when theta=35 degrees the orizontal guide is given a constant upward velocity v0=2 m/s. For the instant calculate the force N exerted by the fixed circular slot and the force P exerted by the horizontal slot on the 0.5 kg pin A.
Water at 20 degrees flows at a velocity of (V =) 2 m/s in a (D =) 250-mm diameter horizontal ductile iron pipe. Estimate the friction factor f in the pipe, and state whether the pipe is hydraulically smooth or rough.
Find the pmf of D2. One point of this exercise is to convince you that Dn is a useful rv for proving theorems, but not an rv that is useful for detailed computation. It also shows clearly that Dn can depend on more than the first n source letters.
The company expects to spend $100,000 per year for labor and $125,000 per year for supplies before a product can be marketed. At an interest rate of 15% per year, what is the total equivalent future amount of the company's expenses at the end of 3..
Atrazine, a neutral triazine herbicide manufactured by the Ciba-Geigy group, undergoes biological and chemical decomposition to formhydroxy-atrazine. a).Assuming a pseudo first order decay constant of 0.01/day for atrazinr and 0.005/dayfor hydroxy..
determine the planer density and packing faction for FCC nickel in (100), (110), and (111 planes. which, if any, of these planes is close-packed
You should provide the structural engineer with a formal typed report that will include all of your analyses and final size of the footing. You should also include all of your design assumptions in your report.
The fatigue crack is propagated ahead of a stress concentration under a constant amplitude of imposed cyclic compressive loads. The cracks arrest naturally after advancing a distance of ten times the notch-tip radius. At this point, the notched sp..
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