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15 1. X-ray machines produce leakage radiation and scattered radiation. Which is the most penetrating and why 15 2. A 150 kVp diagnostic x-ray machine is installed in a room with a 4 in plaster wall along a 4 ft hallway and a 6 in concrete wall adjoining a city street. The average weekly workload is 25 mA min during which the useful beam is pointed horizontally in the direction of the hall and 100 mA min when it is pointed horizontally in the direction of the outside wall next to the street. (a) What are the exposure rates in the hall and outside the concrete wall (b) Calculate any additional thickness of concrete that is needed for the primary protective barrier for each. 15 3. For Problem 15-2, what additional thickness of lead added to the plaster wall will provide an adequate primary barrier for the hall For the public street 15 4. What thickness is required for a plaster wall between an x-ray machine and an adjoining laboratory to keep exposure below 100 mR per week if the x-ray machine operates at 150 kVp for 25 min each day 15 5. What is the weekly exposure rate in the center of an office directly below the 4 in concrete floor of a dentist s office if a 100 kVp x-ray machine is operated at an average weekly workload of 100 mA min 15 6. A dental X-ray machine that will operate at 70 kVp with a weekly workload of 50 mA min is to be placed 4 ft from the outside of a (soft) brick wall where a public sidewalk is located. How thick must the brick wall be to provide an adequate primary protective barrier

Nevertheless, the time required to generate an acceptable solution is usually shorter than if the solution had to be generated manually The latter may lead to a reduction of the throughput time of the planning process This will allow the organization to react faster to changing external circumstances, which may have a positive effect on the exibility of the organization A consequence of the foregoing is that developing a mathematical model requires one to balance the required level of detail of the model carefully with the implied complexity However, in practice there is often a tendency to incorporate as many details as possible into a model The latter may have a detrimental effect on the model s complexity Creating mathematical models and corresponding solution techniques that are really useful in practice is therefore more an art than a science.

I like to build play lists for my media player based on Genre tags, so in the Genre setting I enter the word podcast. This ensures that I ll be able to find all podcasts easily in my media player and my mobile media device if I decide that I want to do some preliminary cleanup before Doppler does it for me.

A further important point is that optimality in practical terms need not be the same as optimality in mathematical terms In practice, usually several con icting objectives play a role Therefore it is impossible to talk about the optimal solution, since the quality of a solution depends on the relative importance that is given to the.

(5.9). So let us focus on the optimization problem of a specific subcarrier n. We now drop some of the subscript n for simplicity, then the sub-problem can be re-written as:

To attach it to a link, select the link and change its URL to #, open the Actions palette, choose Mouse Click from the Events list, click the New Action button to add an event, and then choose Actions SetVariable (Form). The Action now appears in the lower half of the Inspector along with a pair of text fields into which you enter your data (see Figure 16-25).

[8] X. Ma and G. B. Giannakis, Unifying and optimizing null-subcarrier based frequency-offset estimators for OFDM, in Proc. Int. Conf. Inform, Commun., Signal Processing, Singapore, Oct. 2001.