Recent content by phygiks

Thanks for the derivation although I think my questions are still unanswered. When calculating the losses through the resistor and capacitor, he uses voltage 'u' for both. Is this u(x,t)? Both the capacitor and resistor are at this voltage, so in parallel? What about the voltage at u(x+dc,t)?

When deriving telegrapher's equations using Kirchhoff current/voltage laws (this equivalent circuit), are the shunt capacitance and shunt conductance in parallel? I assume not, and if not, are they in parallel with the voltages at each corresponding end? I am confused by this; in Pozar's...

Is there a book you can recommend?

Thanks for replying! I am very new to QM, so I cannot make the connection so easily, but I now I know there is one. Yes I should be able to find out what happens to off resonance spins with the Bloch equations, but I get a very ugly diff-eq. In fact, I am puzzled how the rotation matrices are...

Thanks, I have referenced that book before, but it has very little mathematical explanation. I am trying to find out what happens to spins that are off resonance when a pulse sequence is applied. For example a pulse sequence of 90 will rotate all on-resonance spins into the XY plane, but what...

Hello all, I have questions regarding my understanding of NMR and the mathematics of it. If anyone would take the time to read this, I would very much appreciate it. Please bear with me, I am a beginner. Thank you! First, there is the question on how to model this phenomenon. Up till now I...

Hello all, I am trying to program a GPIB instrument (voltmeter and oscilloscope) in labview. I already have all the drivers set up, but I am having trouble finding easy to understand documentation on how to program these instruments. Does you know of any? Right now I am stuck on trying to...

Regarding coursework, I am a physics undergrad looking for a summer internship. I want to add some of my coursework on my resume, but will the people reading it know about what I learned unless I add some sort of description. For example, I took a class called Classical Physics Lab, would you be...

Sorry to be posting under video lectures, but I couldn't find any posts on books for classical mechanics. Does anybody know of any book replacement for Marion and Thornton Classical Dynamics? Any help would be appreciated.

s is a upper bound, so the Sn-s is negative. So abs(Sn-s) < s -b doesn't hold true all n. I'm not sure though

Hello, I'm having trouble with this question. Let Sn be a sequence that converges. Show that if Sn <= b for all but finitely many n, then lim sn <= b. This is what I'm trying to do, assume s = lim Sn and s > b. (Proof by contradiction) abs(Sn-s) < E, E > 0. Don't know what to do from...

I think I got it, so a>b, let b1 = (a+b)/2, then b1 > b, but a<= (b1=(a+b)/2). Contradiction

Hey guys, got stuck on this question while doing homework. I would appreciate any help. Let a,b exist in reals. Show that if a<=b1 for every b1 > b. then a <= b. I really got nowhere. I tried letting b1(n)=b+nE where E is a infinitesimal. Then a <= b+nE for all n. Don't really know how to...

Thanks again for all your help. I think I have a pretty good pair of recommendations and I'll give it go.

Thanks for the advice. Most of the programs I am applying involve high energy or particle physics. It looks very interesting, but I don't have a concrete idea of what it is. I checked out a book named "Introduction to Elementary Particles" by David Griffiths from the library. Is this a good...