Calculate the total static earth force behind the retaining wall and determine the location and direction of the resultant force.

A cantilever retaining wall is shown in Figure 9.27.

The backfill is granular soil. The wall geometry and the characteristics

of the backfill and foundation soils are shown in the figure. Under the

design earthquake, the horizontal acceleration coefficient is 0.2, and

the vertical acceleration coefficient is 0.05. The external friction angle

between the granular backfill and the wall is two-thirds of the internal

friction angle.

(1) Calculate the total static earth force behind the retaining wall and

determine the location and direction of the resultant force.

(2) Calculate the total dynamic earth force under the design earth-

quake and determine its point of application.

 

find the cost of your paper

Explain why attenuation is not a big problem in PET.

Consider a 2-D object consisting of two triangle compartments, as shown in Figure P9.4. Suppose a solution containing a 511 KeV gamma ray emitting radionuclide with concentration f = 0.5….

Give the mean and the variance of the reconstructed image, mean[ˆ f(x, y)] and var[ˆ f(x, y)].

Ignoring the inverse square law and attenuation, an approximate reconstruction for SPECT imaging is given by where c˜() =  {||W()} and W() is a rectangular windowing filter that cuts off at = 0…..

Find the numerical responses in each to an event in crystal C(4, 6).

Suppose a PET detector comprises four square PMTs (arranged as a 2 by 2 matrix) and a single BGO crystal with slits made in such a way that it is….