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  1. S

    Software to draw simple models

    Hi there, I am wondering if you have any suggestions how to draw these simple engineering models? Thank you in advance.
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    Maximum theoretical power from piezoelectric harvesting

    Suppose you have a predefined volume of piezoelectric (10cm^3). What is the maximum harvested power using piezoelectric?
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    Analysis Reference book for "Fredholm integral equations"

    Hi, I am looking for a good reference book for "Fredholm integral equations". + a book with lots of examples related to this topic! Thanks for your help.
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    Tunneling in a non-subatomic particles

    Hi, We now electrons do tunnel and for example FE happens because of this. However, is it true to scale up this effect for non-subatomic particles? For example, is it OK to say, if you are behind a wall and hit yourself to the wall, there is a chance that you might Tunnel and see yourself on...
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    Multimeter current level when measuring resistance

    Thanks. Since, I do not have access to the device anymore, and I could not find the current level on their website, I am wondering if anyone is familiar with this question or has any idea about it? Thanks you for your help.
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    Multimeter current level when measuring resistance

    Hi, When using a multimeter to measure resistance, what is the used current level of the multimeter? I am using Fluke 77 IV Series Digital Multimeter. Thanks.
  7. S

    INTEGRAL{ e^cos(x) dx }

    I checked wolframalpha. However, it gives a series expansion which I can not use. I wonder if the integration by parts suggested by sharks is doable?
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    INTEGRAL{ e^cos(x) dx }

    I wonder if it is possible to solve the indefinite integral? I assume the answer to the definite one should be close to the answer I get with numerical methods.
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    INTEGRAL{ e^cos(x) dx }

    sharks, it seems that it gets more complicated! I stuck immediately after substitution.
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    INTEGRAL{ e^cos(x) dx }

    Homework Statement I want to solve this integral without using series expansion. The answer should be in a closed form. I wonder if this is possible? Homework Equations The Attempt at a Solution I used numerical methods and was able to solve it numerically for a given...
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    Waves produce oxygen?

    Thanks. I was curious about the role of waves in the % of oxygen present in the water. Specifically, between moving waters and still waters. So, suppose waves do not exist in oceans. Does it affect the livings under water? (you said wave mix oxygen with water and increase the %).
  12. S

    Waves produce oxygen?

    Hi, Does wave hit the shore produce oxygen? If so, how and how significant is this amount of oxygen? Thanks!
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    Effect of dissociation energy on plasma ions behavior

    Thanks. Ok, I also know that the 1st ionization energy of nitrogen is higher than oxygen. http://environmentalchemistry.com/yogi/periodic/1stionization.html So knowing this, can I argue what I said in my 1st post that since the ionization energy is higher for nitrogen, compared to oxygen, can...
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    Effect of dissociation energy on plasma ions behavior

    Hi, Suppose there are two plasma cases, conditions are the same, except for the gases present: a-Oxygen b-Nitrogen Since the dissociation energy of nitrogen is higher than oxygen, what could be concluded from it? Could it be more energetic nitrogen ions than oxygen ions (because initially...
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    Does melting deteriorate the crystalline order?

    I wonder if melting deteriorate the crystalline properties and order of a solid? For example, one should expect to get 2 different Raman spectra from the solid and melted samples?
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    Impedance matching vs max power transfer criterion

    Hello, I wonder if there's any difference between the "impedance matching" and "maximum power transfer" criterion? I assume in both cases, one impedance should be designed to be the complex conjugate of the other. Thanks.
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    Raman spectrum, Graphene

    Hi all, I have a forest of carbon nanotubes. They are vertically aligned, like this picture: I wonder if it is possible to get Raman spectra from the a) surface b) about 50nm from below the surface of the nanotubes? As far as I know, Raman spectroscopy is a surface analyzing...
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    What is a water bubble?

    Thank you. The following setup is related to the previous bubbler. Suppose that water vapour, from the left side, is purged inside a tube where the temperature is around 800 deg C. A reaction is happening in the middle of the tube. The water vaopur will arrive on top of the reaction boat and at...
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    What is a water bubble?

    So I assume evaporation is just a change in the physical properties of the water and does not break the H2O molecules. In order to break the bonds of the molecule, a source of energy (eg. heat) is exerted to the water vapor and that breaks the H2O molecules to H2 and O2. This process is takes...
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    What is a water bubble?

    Thanks. So the output is 'humidified Ar gas'? Is it some kind of physical or chemical process? I wonder what happens to H2O molecules? Are they carried by Ar as H2O or they split to H2 and O? If they remain H2O, can they be split to H2 and O later and under high temperature - like more than 700 C?
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    What is a water bubble?

    This technique is used to add water (in gas phase) along with the Ar gas to the process. As you can see in the figure, the Ar gas enters the container (they call it bubbler, but it is just a container of water) from the left side and then after mixing with water, the output goes to the...
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    What is a water bubble?

    Thank you. ok. Consider an Ar cylinder as the source. A pipe is connected to the Ar source. The other end of the pipe is inside a container which is filled with distilled water. Ar gas enters (purges) inside the water. Because of that, bubbles are formed inside the water container. Bubbles go up...
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    What is a water bubble?

    Can anyone help? Thanks.
  24. S

    Power of laser vs Power of X-ray

    Thank you very much for your time. It was very informative.
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    Power of laser vs Power of X-ray

    I am sorry if my background is not good. Is it right to say photons produce laser, and electrons are the origin of x-ray? If so, the absorption spectrum for these two is different for a given material? Thank you.
  26. S

    Power of laser vs Power of X-ray

    Yes, the amount of absorbed energy is what I am looking for. So, which properties of the material I should check to see the absorption for these two sources? Thanks.
  27. S

    Power of laser vs Power of X-ray

    Hi, I wonder how to compare the power of a laser and an X-ray. For example 1mW power of a laser hitting an object is comparable to the an X-ray generating 1mW of power? Thank you.
  28. S

    What is a water bubble?

    This seems to be a very simple (stupid) question: If an inert gas is purged inside a distilled water container, bubbles are formed on the surface. The question is what are the constituents of those bubbles? and those constituents seems to be formed during a physical process, not a chemical...
  29. S

    Plot some 2d graphs in a 3d fashion

    Brilliant. I didn't think about it that way. Thanks man.
  30. S

    Plot some 2d graphs in a 3d fashion

    I don't know how to work with gnuplot. If anyone knows how to plot these with excel/matlab, that would be great.
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