Recent content by jimalex

I forgot to mention, TIRPN is an rpn environment. It appears to be the best one, from what I could tell (as there are more than half a dozen to choose from). There isn't much out there saying people have had a hard time with it.

I loaded TIRPN on my TI89 Titanium, and when it runs, the busy indicator stays on and the app runs very slowly. VERY Slowly. But it does function, and I can exit the app back into the regular worktop and the system recovers its speed. My calc is not fully loaded down with apps. Is...

I appreciate all the response in the last day! The stuff you all are showing me is not in any book I have, which would be precalc/calculus stuff mostly. Eigenvalues and eigenvectors are from linear algebra, aren't they? can y'all point me towards a book or two so i can study up on this...

Thanks for your time. What I am taking away from this is your lists of observations, the understanding that it is more practical to deal with the general form by boiling it down to a specific section, and that trying to learn to transform the general form itself directly is just too...

yes, sir, i remember that the conics are cases of the general equation. rather than learning the significance of the variables and coefficients in the general form, i was shown how to derive the different conic sections from their definitions and then we studied the transformations of that, for...

and, yes, ... = 0. you're right, the = 1 was what i was playing with in wolfram alpha when i wrote my message yesterday.

Haruspex The math I had (precalc and calc, a long time ago) showed us the general form, but then only really worked with the conics, as you pointed out in the end of your last message. What kind of math book do I need to better understand the general form? thanks for helping me.

I am trying to figure out how the coeffecients in the general second degree equation transform the function as they change through a range of values. I think that d and e are the proportion of x and y are horizontal and vertical shifts, but less sure about a, b, and c. Here is the equation as...

Also, I see no difference in the wikipedia diagrams, except that the leakage flux in the secondary is opposed to the flux coming directly through the core into the secondary. probably just showing my ignorance here, again...

Thanks for the replies, hope nobody minds I kinda hijacked Nemesiswes' thread :biggrin: The diagrams in Jony130's post I think I understand- the polarity of the magnet being reversed changes the polarity of the induced voltage. Where you may have to help me again is to understand the...

vk6kro, i knew the back voltage on the primary would be 180 degrees out of phase, but I think now i understand better why you refer to the voltage induced in the secondary as back-voltage, since it is in time (phase) with the backvoltage in the primary. however, I thought the right-hand...

I have built systems similar in concept to the one you are proposing. mine are for industrial automation. We typically build machines with several three phase transformers and single phase transformers using the same connection to ground, and they are fine. even in buildings, there can be...

I work in industrial electrical and electronic machine manufacturing. we use these alot; we call them flyb, ack diodes. Flyback is when the current through a coil is interrupted and all the energy stored in the coils of the solenoid is near-instantaneously delivered into the circuit literally...

Please correct me if i am wrong, but the problem here as i see it is we are mincing our terms with what is a back-voltage and what is an induced voltage. the back voltage is caused mainly in the primary, for example, reacting to the transformer's power supply from whereever. as the current...

Thanks Chiro- Interested in the wavelets. found what i think are a couple of good books including numerical methods that work, which seems highly recommended. also, found smath studio and started playing with that. It's a mathcad clone. i appreciate the info, very much. Jim