Lately, I've done a lot of research on this and m currently building a portable methanol micro reactor targeting portable electronics.
If you're willing to use a hydrocarbon fuel (2-3.something Wh per ml depending on the efficiency) then Direct Methanol/Ethanol or Direct Borohydride Fuel Cells...
Hi Orion!
I've actually recently been starting to build a micro-DMFC stack for portable electronics of my own.
From my understanding, each cell, when no current is moving through an external circuit, produces a given OCP (Open Circuit Potential) that is a little less than its theoretical...
Hi All!
Haven't been here for some time, the changes are looking good!
Anyway, formalities aside, I am having serious problems sourcing and implementing a suitable stainless steel (Grade: 304; thickness: 0.3mm) substrate for my etching process.
I'm currently working on developing a...
http://books.google.com.au/books?id=x-XZBJngdM4C&printsec=frontcover#v=onepage&q&f=false
This post is referring to page 35-36.
I just find it odd that this book doesn't change it's mathematical description to align with the fact that a ring produces a component force up smaller than the...
Oh, I see the mistake in my logic, I was looking at the cartesian equation being ambiguous as a result of the vector equation, I suppose that the vector equation is ambiguous until we add the actual vector, then we get a unique equation for the plane.
Don't know what I was thinking. There's...
Right, BUT my book says that it is a definition (Or at least says that it determines a single plane) which is weird.
Also, how can we derive the standard cartesian equation a(x-x0) + b(y-y0) + c(z-z0) from the vector equation?
Just curious about a certain facet of the vector description of a plane. My query is as to why it is defined as n • (r-r0) = 0. Great, that's because any two vectors with a dot product of 0 must be orthogonal to each other and if we have a point on a infinite plane with an associated vector we...
Okay, I would suggest is a power tower derivation in conjunction with L'Hospital's rule.
If we derive 8x we get ln8 (ex). If we derive xx we get (ex)lnx, if we take u as equal to ex and say that u approaches infinity as x approaches infinity we end up with lim u → ∞ ln8 (u/(uln2u), if we use...
Homework Statement
The problem contained five answer choices, of which I the answerer was to find one that fit the criteria of the question. The question was: "Which series of the following terms would be convergent?".
It listed five series, The answer was this term: 1 + (-1)n / n. Homework...
That's exactly what I seem to have done, you see I thought that the change in change of the direction of the object's momentum would be proportional to it's velocity. I now understand how the individual second derivatives of x(t) and y(t) respectively determine the rate of change of rate with...
Okay!
Earlier today I was thinking about potential energy and how it is related to an orbiting object, O, around a centre, C, from which force emanates if the object O is traveling at radius r from this centre, we conclude that the force given by the change in direction must be equal to the...
Oh, no y is a function of t!
Not the height!
I actually think that I found the correct function simply by playing around with the constant k. Let me revisit this!
Okay, this is a really simple question, so to anyone looking for some extraordinarily complex differential equation question turn away now, or be blinded by boredom.
My query is rooted in a question I had about building a water clock... so seemingly relevant to Differentials, I know...
I've just finished it, well, the third edition anyways.
I like it, it is an illustrious (not in the figurative sense) book, it explains things visually, which I find easily digestible.
The only problem which I have with the actual book is that it doesn't really delve into much depth, for...
But wouldn't a function defined as (r, g(r) ) not be an actual function since f(\theta) = f(\theta + 2 \pi ) , so for every r there would be a myriad of possible values of \theta that would be solutions. Just as we can only define inverse trigonometric (sine for example) functions on a...