Recent content by terryphi

Hello, Given an infinitely long cylinder with a specified surface heat flux, the thermal resistance of an annular region is given by, R_th = ln(r_out / r_in) / (2 pi L k). When I'm calculating the thermal resistance to the centerline, r_in = 0. Does that mean there is infinite thermal...

I'm going through the book "Elementry Differnetial Equations With Boundary Value Problems" 4th Eddition by William R. Derrick and Stanley I. Grossman. On Page 138 (below) ) The authors take the derivative of a definite integral and end up with a definite integral plus another term. How did...

Well, I'd perfer it to be able to be positioned without any sort of physical connection to a wall or something like that.

Hello, I'm looking for some ideas as to how I can get the position of a beacon/actuator to within 0.1mm in a cube 10m x 10m x 10m. I need to take a reading off an instrument at every point within this volume, with a displacement of 0.1mm between readings. The lidar systems I've looked at are...

Well, I know it's the incremental form of the Taylor series: http://geophysics.ou.edu/solid_earth/readings/taylor/taylor.html But I have no clue how to derive this incremental form.

Hi There, I came across the following passage in Sam Glasstone's 'Nuclear Reactor Engineering' See where I underlined in red that taylor series expansion? I don't understand how (dt/dx)_(x+dx) is equal to that. I know it's a Taylor series expansion, but where did the x+dx go?

As of now, there are no enrichment facilities operating for Li7 enrichment. Li6 would kill the neutronics of any operating reactor. The MSRE used Li7 left over from the weapons production (did they want Li6 or Li7 for weapons?); however, no such facility operates today; as far as I know.

You need a conversion factor. Look at Bernard Shlein, L. A. (1998). Handbook of Health Physics and Radiological Health Third Edition. Baltimore: Lippincott Williams and Wilkins.

Hello, So, I'm reading up on penning gauges, and wikipedia (reliable source I know :P) says that the collector current depends on the number of cations which strike it. So, the question I have is, how can you detect when a cation strikes a cathode? is there some sort of change in current? Why...

The formula for magnetic pressure is P_{B} = \frac{B^{2}}{2\mu_{0}} Now, the units on the left hand side are clearly Pascals, but the units on the RHS are T^2 H^-1 m. I've been trying and I can't see how to make the units on the RHS equal the units on the LHS. does anyone have any insight?

Hey Guys, From my understanding, the linear doubling time of a reactor is the time which the fissile nuclides in the reactor core double under a constant flux. The exponential doubling time of a reactor is the time it takes for the fissile material in a core to double if you take each atom...

On the CANDU reactor control room system, all their indicators used old neon lamps that occasionally burn out. It would be really useful if someone could design a long lasting LED replacement which could plug right into the existing neon lamp socket without any modifications.

The progeny of alpha emitters are ionized. If you have a statically charged surface, they will stick to it.

Oh man, I actually wrote a paper on this! https://www.dropbox.com/s/j2s6y3s8p87vad4/An%20Investigation%20of%20Electrostatically%20Deposited%20Radionuclides%20on%20a%20Latex%20Balloon%20-Final-WITH%20REVISIONS.docx

We're using "Introduction to Nuclear Engineering" CR -> consumption rate BR -> Burnup Rate.