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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
A bore is a hydraulic jump that propagates upstream into a still or slower-moving fluid, as in Fig. P10.86, on the Sée-Sélune channel, near Mont Saint Michel in northwest France. The bore is moving at about 10 ft/s and is about one foot high.
1.An ungated spillway is to deliver 150,000 cfs with a crestelevation of 1000 ft. The upstream reservoir elevation is not toexceed the elevation of 1030 ft. The streambed is at elevation 800ft. Determine the length of the crest required.
The Field data and the fixed data follow for each of six traverses. The forward direction is given by the alphabeteical order of the station names. Each angle is measured clockwise from the back direction to the forward direction so that they are on..
Determine the self weight, moment of inertia, and cross-sectional areas for the following hot rolled standard section:
How much energy is stored in an isolated spherical capacitor of radius ,R=25 cm, if it is charged to a potential of 5000V?
To what maximum angle, measured from vertical, does the rod (with the attached ball of clay) rotate?
What is the reaction that occurs with hexanal and propanol (give both the hemiacetal and acetal products)?
Determine the maximum force that can be safely exerted by link AB
A 405-n rightward force is used to drag a large box across the floor with a constant velocity of 0.678ms. The coefficient of friction between the box and the floor is 0.795. Determine the mass of the box.
What are the important findings in Austin Road Co. v. OSHRC and Builders Steel Co. v. Marshall? Your response should be approximately 200 - 300 words and include a reference citation for your response.
Using photo coordinates for points 4 and GYM on image 5, determine the flying height of the camera at the time of exposure.
Water flows through a pipe at 14cfs. At a point where the pipe diameter is 18in. the pressure is 30 psi; at a second point, further along the flow path and 2 ft lower than the first
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