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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
Design a one way slab to support a uniform live load of 300 psf. The beam is simply supported with a span of 20 ft. Use a reinforcement ration ( Ps) of 0.008 Use f'c=3000 psi and fy=60000 psi.
Prepare a set of suitable field notes for this project (see Plate B.6 in Appendix B) and compute the cut required at each stake. Close the level circuit on the benchmark.
An industrial waste water treatment plant discharges into a large river. the industrial waste water is at 1m^3/s and contains an ultimate BOD concentration of 300mg/L at a temperature of 30 degrees C and a DO concentration of 2.5mg/L
The Fluoride feeder runs out of feed solution. The rapid mix tank is connected to a 5 km long distribution pipe. The flow rate into the tank mix tank is 0.44 m?/s and the volume of the tank is 2.50 m?.
A triangular shaped swale is to retain the runoff from a catchment with a design runoff rate of 0.01 m3/sec. The longitudinal slope of the swale is to be 1.5% with side slopes of 5:1 (H:V).
what is the rate of evapouration of water from a reservoir with air temp at 20c and the surface of reservoir is 3000m2.
A mining firm makes annual deposits of $250,000 into a reclamation fund for 20 years. If the firm must have $10 million when the mine is closed; what interest rate must the investment earn
A new bridge may require twenty to thirty drawings in the contract drawing package. Which of those drawings does the construction surveyor typically consult for the data needed to provide the survey layout?
Do the problem again but for an alum or iron floc with an overflow rate 20 m3/day.m2?
Define the the term ultimate bearing capacity as used in foundation
A 2.1 m diameter sewer is laid on a slope of 0.0032 m/m. If the Manning's Coefficient for the sewer is equal to 0.015 at all depths and flows, determine flow (Q) and velocity (V) when the sewer is flowing full,
The removal of a volatile organic compound (VOC) from a wastewater can be described by a first order reaction with a reaction rate constant of 5 day-1. The wastewater has a flow rate of 150 m3/hr
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