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In the two experiments above, the range of the projectile is considered to be a measure of the velocity of the projectile. A neat EEI would be to compare methods of velocity estimation rather than just the factors that influence the range. I have seen an interesting method in (Nov 2007, Volume 45, (8), pp. 496) in which a microphone hooked up to LoggerPro or some other data recorder is used to measure the time elapsed from the initial explosion to the time taken for the sound to return from the target. You need a big metallic target like a thick sheet of aluminium placed say 10 metres away.

AOE 3054 Experimental Methods Spring 2018

Experimental Methods in RF Design. 94 likes. EMRFD + SSDRA + LTSpice = BSEE in a can
If you have performed experiments at a particular location or lab because it is the only place to do it, or one of a few, then you should note that in your methods and identify the lab or facility.

 

Experimental Methods in RF Design by Wes H. Hayward

Density - Theory, Experimental, and Graphical Methods
He pointed out that investigations of the phenomenon need to control a large number of initial parameters (including type and initial temperature of the water, dissolved gas and other impurities, and size, shape and material of the container, and temperature of the refrigerator) and need to settle on a particular method of establishing the time of freezing, all of which might affect the presence or absence of the Mpemba effect. The required vast multidimensional array of experiments might explain why the effect is not yet understood. There is a world-wide competition regarding these experiments. I'm told a Yr 12 student at Villanova College, Brisbane, submitted his Physics EEI and was placed 11th in the world.

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There is plenty of room to discuss errors though, and how they can be addressed. The mathematical formula gives the curve that best fits the experimental data within the error bars. But it is to be used with caution: The existence of a cut-off speed U greater than 0.228 ms-1 has a physical interpretation. It means that it's not possible to reach U = 0 ms-1 with this method. Mohamed pointed out that:


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As mentioned above resistance in wires is difficult to measure accurately because most metal resistance is too low to accurately measure by standard means (ammeter and voltmeter). It should be possible to do it accurately with a Wheatstone Bridge, but if using wire with low resistance (eg copper, aluminium, steel) you may find issues with the resistance of connectors being significant. However, using something like nichrome should work OK. A jug element is a simple way to experiment with nichrome.

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One other way to get a reasonable resistance change from copper wire is to use a long length of it. Three of my Year 12 Physics girls (Georgia, Shannon and Georgina) at Moreton Bay College made up coils of copper wire on cotton-reels in an experiment about guitar pickups. In one case they wound a coil of 800 turns of 0.25 mm diameter enamelled copper 'armature' wire. When they had finished I used it for an experiment on resistance and temperature (see below). They didn't know I took it but it works well.

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On the other hand, the logic of experimentation up toFisher's time was that of controlled experiment. In a controlexperiment, many variables are experimentally fixed to a constantvalue. However, Fisher explicitly stated that it is an inferior method,because it is impossible to know what variables should be taken intoaccount. For example, a careful researcher may assign equal numbers ofmales and females into each group, but she/he may omit the age andeducational level of the subjects. In Fisher's view, instead ofattempting to put everything under control, the researcher should letrandomization take care of the uncontrollable factors. It is not tosuggest that Fisher did not advocate controlling for other causes inaddition to randomization. Rather he explicitly recommended that theresearcher should do as much as control as he can, but he advised thatrandomization must be employed as "the second line of defense"(Shipley, 2000).

Atherosclerosis: Experimental Methods and Protocols

How to make this an EEI? You could consider making a series of measurements at different water depths and plotting them to see if RI is constant over the range of depths. The accuracy of the smaller depths can be commented upon. You could always perform this on a hotplate as in the above experiment and look at RI vs temperature, or you could think of something more imaginative. My thanks to Prof. Shyam Singh, Department of Physics, University of Namibia, Windhoek, Namibia for this suggestion (, March 2002, p152). Read about safety in suggestion above.