how many layers of geogrid are required to raise the factor of safety to 1.4?

An existing roadside embankment needs to be reinforced using

geogrid sheets. The embankment is 15-m high and the slope angle

is 40°. The in situ soil will be used as the reinforced backfill. The

soil strength parameters are f = 220 and c = 15 kN∕m² in both the

embankment and foundation sections. The unit weight is 17.3 kN∕m³.

The critical failure surface is assumed to be a toe circle, and the center

is located at (+3 m, +18 m) with respect to the toe at (0,0). Assume

the groundwater table is far below the foundation. The ultimate

tensile strength of the geogrid is 75 kN∕m. The vertical spacing is

chosen to be 40 cm. For the critical failure circle, how many layers of

geogrid are required to raise the factor of safety to 1.4?

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…..

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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….