Recent content by vadar

Gah... I was using Sin() instead of Sin[]... I have TrigReduce working now, Thank you very much! Its always the little things haha Cheers

Hello, I am trying to derive the harmonic content of a signal passing through a transistor's transfer function. After a Taylor expansion in Mathematica 7, I have the expanded equation and the next step is to reduce everything to first order Sine/Cosine functions. In Mathematica, if I have a...

Yes, smart idea, I had researched into other alternatives However I thought a blood meter measured specifically glucose though some sort of chemical reaction. Sucrase would separate surcose, but would it separate fructans? In this case, glucose is only a small portion of the total sugars...

Hey Ahh so that's what frap means, thanks for that. I'm not to sure that is correct, that I will obtain a vaild brix reading even with a consistent method. Even though it is consistent with prior readings and maybe other peoples reading (assuming there using the same technique) brix...

Hey Jim I am in NZ. It is spring, nearing summer here. Very interesting, I did not know about enzymatic changes. Does this mean the brix reading will change over time? What exactly is happening in this process?? I guess surcose is being changed to a larger compound or something? I will...

Hey Jim I am currently looking into using a brix meter to assess the soluble sugars in a pasture. Yes, there are many things which affect the brix reading, time of day, year, barometeric pressure, soil history, you name it... With regards to blending the grass, I would have thought this...

Actually that's another question I am not sure on. What does industry look for? Will I even have much of an edge if I obtain a PhD?

That's the thing, the project has no real group based around it. It is just me and the professor at the University. He is most likely getting funding for the project at the end of next year to start building a group around the topic but, that's next year. In saying that, the contacts that...

Is it worth doing a PhD at an unknown University? Hi I am considering doing a PhD in electronic engineering, at an unknown, under acknowledged University. When local people are asked they say, "oh, do they do engineering there?". However the topic is great, really frontline smart stuff...

If you do some quick calculations with Faradays law you will start to see the problem. A very small voltage would be created across a winding under the road, due to a number of things; The car being realitivlty far from the coil, the coil is underground, cars may not come past so energy would...

I would think that it is possible however it is not practical. The traffic lights are using the induction as a sensor, and rely on the moving car, and not as a power source. If you wanted to charge a battery by the same principal, say in a lab, you would have to physically move something...

Hi all I am an electronic engineer and am currently looking into taking brix measurements of pastures in NZ. (Not really my speciality!) I am using a brix refractometer which is meant to measure the surcose/water ratio for a solution. Currently I use a garlic press to sqeeze the sap from a...

Hey Andy and Mrainer, thanks for the help i appreciate it ! Andy, I would assume the enzymes and protiens would be much larger than the wavelength, wouldn't this mean the photons that hit these compounds would have a different critcal angle, and hence I would obtain different readings ...

One thing I should add, The refractometer is finding the refractive index of the sap by reflecting light off it onto a small CCD sensor. From the critical angle of the sap glass interface, a shadow is cast over the CCD and it finds the refractive index from measuring this amount of pixels lit...

Hey I am currently looking into refractometry, and how light reflects off a interface between to materials. I have looked through most of the other threads but nothing really explained what I am looking for. My problem, I have a digital refractometer and I am measuring the reflective angle...