Recent content by seang

I won't give you the full explanation here, but I will try to point you in the right direction. When I was in college, I first learned about reflection coefficient from 'Engineering Electromagnetics' by Inan and Inan. This text will give you a good description of reflection coeff. and...

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How would that factor come about? I hvae converted all the imperial quantities as mentioned above, not sure where that factor would come in. However, if I multiply my imperial figure by sqrt(386), I get about 262 Hz, which is somewhat close... Thanks for your reply btw

electromagnetics is hard, but don't be discouraged. somebody's got to do it. study hard and take pride in shaming the rest of your class ;)

Homework Statement Sorry for wasting your time and bandwidth, but I can't figure this out. I just have a cantilever beam with the following specifications: length : 40 in. width: 2 in. height: 2 in. E = 30e6 psi. mbar = .8991 lbm/in. And I'm trying to find the beam's resonance...

There is a classic text by Sze and Ng which will give you an overview of these things. When you want to know about short-channel effects, a good place to start is device scaling. Let's say, in a MOSFET, you want to scale a device, but keep the same electric field in the gate oxide. Well, to...

Hi, thanks for the reply. I know of Mohr's circle etc. and bending moment diagrams, but I am not too knowledgeable of either to be honest. What sort of practicality are you referring to? Are you saying that bending moment diagrams and Mohr's laws would be the most practical way to obtain...

Homework Statement This isn't really a homework problem but something I...felt like figuring out. I'm an EE student, so this isn't rly my game, but I'm giving it a hack anyway. See the attachment for an outline of the problem. The attachment shows the top view of a beam connected rigidly...

would you mind pm'ing me as well?

wow, so simple. thanks a lot. re-reading my ODE book, it says that the method i was using assumes the answer is exponentials. i guess i should read more carefully

Homework Statement Hello, I should probably know how to do this, but I am confused as to how to solve the following 4th order ODE: \begin{align} & EI \frac{\mathrm{d}^4 w}{\mathrm{d} x^4} = 0 \\ & w|_{x = 0} = 0 \quad ; \quad \frac{\mathrm{d} w}{\mathrm{d} x}\bigg|_{x = 0} = 0...

Thanks for your help!

Hi, I am an electrical engineer, but I have to complete the following procedure: Synthesis of Esters. (a) Methyl Ester. The methyl ester of 10- undecylenic acid was prepared similarly to the method used by Sieval. The 10-undecylenic acid was dissolved in methanol and allowed to reflux for...

Hi, I am having trouble understanding some things about k-space or momentum space in a crystal. The trouble began when I was first introduced to the Bloch theorem, a few weeks back. It is: \psi_{n\mathbf{k}}(\mathbf{r})=e^{i\mathbf{k}\cdot\mathbf{r}}u_{n\mathbf{k}}(\mathbf{r}). In...

Hello, I am trying to use the electrostatics module in COMSOL ( I just started a few days ago). The other day, I was able to create a 2D box, apply a charge at one side (via boundary condition), and ground the other sides. I solved, and got a neat output, that I suspect is correct. Then...