Recent content by warfreak131

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    I Heat transfer within a laptop computer from CPU and GPU

    So theoretically would a heatpipe with a higher thermal conductivity result in a lower differential?
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    I Heat transfer within a laptop computer from CPU and GPU

    Hello all I have a practical question regarding heat transfer within my laptop. My laptop uses a shared-heatpipe design, meaning that my CPU and GPU are connected by a common piece of copper, and then each chip goes off to its own heatsink/fan. While playing games, I was monitoring the...
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    How do you calculate the energy required via torque when...

    The "load" is just my way of saying the force. I understand the integral, I just wasn't sure if it was as easy as dropping in the FrSin[x] into the integral, but I guess it is. Thank you.
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    How do you calculate the energy required via torque when...

    Let's say you have a lever arm connected to a load at the end. But the load is attached to a hinge, so no matter where the lever arm is, the load is always pointing down. I know that Energy = [integral] tau d_phi, but does that only work if the angle b/w arm and load is constant? What if the...
  5. W

    How does the Beer Lambert law work at non-normal incidences?

    Okay, so I calculated Rp+Rs / 2, and I got 93% reflectivity, but that doesn't take into account the thickness of the film. I think it's more appropriate as a way to model a thick film where practically nothing makes it through the aluminum film. EDIT: Or is it just impossible, regardless of...
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    How does the Beer Lambert law work at non-normal incidences?

    Thanks Dr Du. Since my light source is going to be unpolarized, the total reflectance is going to be (Rs+Rp)/2. Since both Rs and Rp are dependent on n2, would I just use the real index of refraction to calculate the amount reflected, and then when calculating what is attenuated, use the...
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    How does the Beer Lambert law work at non-normal incidences?

    I want to calculate the intensity of a transmitted wave in a medium, but not at normal incidence. I want to consider the case of 45 degrees. What proportion of the intensity of the wave is lost by reflection? Specifically I am looking at a the reflection off of a thin film of aluminum...
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    Have you ever heard of the physicist Alex Abastian (sp?)

    I'm not sure how it's spelled, Abastian, Ebastian, etc. He died recently, probably within the past year or two.
  9. W

    Measuring the electron mobility of a molecule

    What I have is a layer of Indium Tin Oxide as the anode, a molecule in between, and gold as the cathode. When I run the IV curve of it, it isnt a linear relationship. The closest way I can approximate the behavior is like sqrt(x) or 1-e^(-x). the slope is constantly changing, so I don't know...
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    Measuring the electron mobility of a molecule

    Hello PF Let's say I have a device with three layers, A, B, and C, where layers A and C are the anode and cathode. I can measure the IV curves from that device easily. Now lets say I added a fourth layer, D, in between A and B. Layer D interacts with layer B such that it increases it's...
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    Completely dissolving a gas into a liquid

    Hmmm, then what would be the best way to maximize the amount dissolved? I was thinking, if I added a 1 way valve into the system, then it would draw in air consistently as long as the system isnt at atmosphere. So if anything happened where the pressure of the soda wasn't at atmosphere, the 1...
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    Completely dissolving a gas into a liquid

    Ok, I'll try to clarify. (see attached pic) Let's say I want to re-carbonate soda that's gone flat. I would put soda in a vessel which will allow CO2 to pass through it. And then the CO2 just flows through the soda again and again until its dissolved as much as possible. If I cool down the...
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    Completely dissolving a gas into a liquid

    Hello PF I want to dissolve a gas in a liquid. I figured I could create a closed loop vacuum system. I introduce gas into the lines at atmospheric pressure, and then close off the lines, so the intake and exhaust of the vacuum pump are connected. Then I turn the pump on and the gas just...
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    What would cause sudden change in evaporation chamber behavior?

    I actually figured out the problem. The electrodes were too tight when securing the evaporator boat. I don't know why this happens, I'd figure better electrical contact would mean better performance, but no. I loosened them significantly to the point where I can still shimmy the boat around...
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    What would cause sudden change in evaporation chamber behavior?

    Hello all, I use an evaporation chamber at my lab every day. Basically, put some substance in the chamber, close it, bring it down to vacuum, and pump enough current through it to vaporize it where it deposits on a substrate. I've been using 175A to create a deposition rate of about 1...
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