Recent content by Woland

Hi RaduAndrei, The two books which I like for the introduction of Fermi-Dirac statistics in relation to semiconductor devices are "Solid State Electronic Devices" by Streetman and "Semiconductor Physics and Devices" by Neamen.

Hi everyone, One approach to solve the Schrodinger equation is to use separation of variables: the solution is composed of a time dependant and space dependant component. When we go through the math, we get a time dependent LHS equal to a space dependant RHS, which means they must both be...

I was able to figure it out . The usual least squares method applies to this. I fit z = Ax + By + C by creating a matrix of sums etc etc. It worked out nicely for the 3D case, same as for the 2D. Thank you,

Hello all, I am trying to fit a surface to a 1920x1080 grid of evenly spaced data points. The values are supposed to be more or less uniform (its an image of a uniform white light source). So I would like to fit a plane to it (but maybe a paraboloid if it is not quiete uniform). What method...

Well a prism refracts the light going through it. Different wavelengths would be refracted by different amounts (thats why white light turns into a rainbow). If you send a red laser in, it would still be red, just refracted, creating a virtual light source. With the biprism setup, you would get...

Here is a question. The previous poster showed that the ice in the craters does not sublimate fast enough to have significant losses. But the sublimation rates might be fast enough outside of the craters, where the mean surface temperature is between 220k - 130k (according to wiki). Would we...

Hello all, I am trying to extract the 2nd degree polynomial coefficients from a curve of best fit applied in EXCEL. I know how to do it (http://spreadsheetpage.com/index.php/tip/chart_trendline_formulas) 2nd Order Polynomial Trendline Equation: y = (c2 * x^2) + (c1 * x ^1) + b c2...

The pinhole diameter is 100um. I am not sure about the flatness of the plate, but here is a link to the model I am using: http://www.thorlabs.com/thorProduct.cfm?partNumber=SI750 When I mention moving the point, I mean along the optical axis. I start with a position which provides a...

for my final undergrad project we have to build a robotic car which needs to guide itself to a garage indicated by a certain frequency LED. All sorts of optical and other sensors are used for guidance, as well as a lot of microcontroller programming. However, every one does this project so we...

Hello everyone, I am trying to test the collimation of light emerging from an off-axis parabolic mirror. My mirror has a diameter of 0.5m or so. The focal length is about 5m. The light source I am using is a red laser focused at a pinhole. To test the collimation of this point source, I am...

Lets take some equations: LaPlaces equation, Scroedinger's equation, Boltzmann distribution. What nomenclature would you propose?

Schrodingers equation would be known as "the change of the quantum state of a physical system in time" equation. Would get a tad confusing with all the different equations.

Well bright field microscopy relies on light passing through the sample on its way to your eye. Different types of tissues would absorb the light differently, and this is what gives the technique its contrast. To enchance the contrast the sample can be stained, which would help absorb more light...

There is more to the story than fa/fg when the ramp is inclined. Ff = u Fn u = Ff/Fn Fn is mg cos(angle) Ff is not equal to Fa like it was for the horizontal surface. Now Fa is being opposed by a part of Fg and Ff. So we do a summation of forces along the path of motion (up the ramp)...

(x-a)^2 + (y-b)^2 + (z-c)^2 = d is a sphere centered at a, b, c with radius square root of d. Now regarding the first post, I can bring the z over to the left hand side: x^2 + y^2 + z^2 - z = 0 Then complete the square x^2 + y^2 + (z - 1/2)^2 -1/4 = 0 [(z - 1/2)^2 = z^2 - 2*1/2 z...