Recent content by rowardHoark

The pattern could be at an arterial, arteriole or capillary level. There are plenty of examples of branched patterns in organisms. [SIZE="1"](C) Baccar et al, Difficulté du diagnostic étiologique d’un poumon clair unilatéral, La tunisie Medicale - 2011 ; Vol 89 ( n°06 ) : 578-579 But...

Thank you, HallsofIvy. I will try to incorporate angles into my mathematical model. I know the coordinates of the points where the lines meet, hence can derive angles. The system is dynamic. The coordinate points are generated randomly, therefore I need to be able to know the exact area for...

http://img838.imageshack.us/img838/1538/physicsforumquestion.png Say "A" is a river. It is a linear approximation because only several coordinate points are known. The total length is "l" (obtained from the coordinates), "a" represents the distance from the river at which the soil is...

Thank you, CEL. The answer is -(14-w^{2})(w^{2}-45)+7jw(14-w^{2})=0 If designing a controller using Ziegler-Nichols second method, would I pick \omega=\sqrt{14} or \omega=\sqrt{45} as my value to calculare P_{cr}=\frac{2\Pi}{\omega} ?

Factoring a 4th order polynomial Homework Statement Example: (jw)^{3}+6(jw)^{2}+5jw+30=0 can be re-written into 6(5-w^{2})+jw(5-w^{2}). The fact that there are two identical (5-w^{2}) is a desirable outcome. Imaginary number j=\sqrt{-1} becomes -1 when raised to the power of 2. Homework...

I was thinking of a Software Engineering postgraduate degree, although I feel it's too much of a different field for a mech eng. If I do any career changes - I want them to be gradual, maybe taking some modules at a uni, while working. P.S. English is not my mother tongue. When I think IT -...

I am very much interested in design engineering, development of consumer, scientific and medical devices. My favourite aspects of engineering include mathematics, CAD and computational engineering. I would say that my key strengths lie in analytical, mathematical thinking and very strong...

I have a very small set of data. Usually 3 points, sometimes 4. Best fit is a logarithmic equation y=m*Ln(x)+b How can I obtain m and b?

All the ideas are very interesting. Heating up the magnet is an original one, however, a combination of a permanent magnet / solenoid seems more elegant. Further research showed that these are called electropermanent magnets. Here is a short description...

Problem Traditional electromagnets create a magnetic field when current passes through them. What I need is a magnet that loses its magnetic grip when current passes through. Is there a particular name for these kind of magnets / systems? Application I want the magnet to hold a metal...

I am assuming you are using the Kirchhoff's current law? I agree with everything, except the frac \frac{u_R(t)}{sL}.Can you, please explain, how does this results in current? How can you have a time domain function in the numerator and a frequency variable in the denominator?

http://img28.mediafire.com/bacfa47633147eefb0c3433511d3f1415g.jpg 1. Electrical system given. Find a transfer function. Correct answer UR(s)/U(s)=1/(s+2) 2. My attempt Use Kirchhoff's voltage law u(t)-i(t)*R1-UR(t)=0; u(t)=i(t)R1+uR(t); apply Laplace Transform (L.T.) U(s)=I(s)R1+UR(s)...

Thank you for some useful insights. However, I can understand why H(j\omega) = \frac{10}{10} = 1 results in phase 0 and H(j\omega)= \frac{10}{-\omega^2} in phase -pi ?

1. For the control system described by the transfer function H(s)=Y(s)/U(s)=10/(s^2+11s+10) Sketch the bode plot: amplitude and phase diagram. What is the bandwidth of the system? 2. General form of a second order system H(s)=wn^2/(s^2+2*zeta*wn*s+wn^2) Magnitude characteristic in...