Recent content by Imperatore

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    Graduate Current at maximum power - PV cell

    aby book explainig that pheno? It is written in every book I' ve examined that these two currents should be approx the same, what in my case obviously is not met.
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    Graduate Current at maximum power - PV cell

    From that I get: 1) Characteristic U(I): IL=ID+ISh and ISh= 0, so IL=ID=0,5 2) Characterisitic P(U): 0,5=IL=ID+1,17(it's measured ISh), so ID=-0,67 mA sth wrong
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    Graduate Current at maximum power - PV cell

    You mean that http://en.wikipedia.org/wiki/Theory_of_solar_cells#Equivalent_circuit_of_a_solar_cell ?
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    Graduate Current at maximum power - PV cell

    Is it that difference?
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    Graduate Current at maximum power - PV cell

    It is my graph ;) The current from P(U) is the current through the shut resistance, and Im from current-voltage characteristic shows the current without shut resistance. It is that what you mean? In here http://www.instsani.pl/images/PV8.ht4.jpg you can see, that these currents are equal...
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    Graduate Current at maximum power - PV cell

    Hello there ! I got question regarding PV cell. The current at maximum power Im calculated from current-voltage characteristic doesn't equal to the one calculated from P(Ushunt, as you can see in the attached picture. http://prnt.sc/b864hx Furthermore, the Im from P(U) characteristic is about...
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    Undergrad Semi ln plot- uncertainty estimation

    Oh, I should devided that relation |exp(-33.21-0.212)-exp(-33.21+0.212)| by 2, obviously.
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    Undergrad Semi ln plot- uncertainty estimation

    I got it. Uncertainty is |exp(-33.21-0.212)-exp(-33.21+0.212)| equals 1,6 e-15 Is it really that simple?
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    Undergrad Semi ln plot- uncertainty estimation

    Hello there! There is a problem with calculating the uncertainty from semi- ln plot. The linear fitting gives standard errors as you can see in attached picture. In the Y axis are ln J values, obviously. If the intersection with y-axis, x=0, then we get the point y=b=-33,21, and it's ln J', so...
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    Undergrad Pump Probe Spectroscopy: Introduction to a Powerful Technique

    Rebound, I think that the most used pomp and probe method to study NCs is Transient-absorption spectroscopy, but I am not quite sure. Could anybody verify this, and maybe know any other methods?
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    Undergrad Pump Probe Spectroscopy: Introduction to a Powerful Technique

    NCs mean Nanocrystals in that case
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    Undergrad Pump Probe Spectroscopy: Introduction to a Powerful Technique

    Any ideas how these methods can be applied to study NCs?
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    Undergrad Pump Probe Spectroscopy: Introduction to a Powerful Technique

    No sub here ;)
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    Undergrad Pump Probe Spectroscopy: Introduction to a Powerful Technique

    Hello there ! I am looking for a brief description of a pump probe technique. I am rather new to this subject, so I am interesting in such a good introductory articles or books. Your own explanations are always welcome ;)
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    Graduate The limiting sphere in crystallography

    here is the point,the number of possible reflection is limited to the volume of toroid after 1 rotation ? and second question, 2 rotations about 2 perpendicular axes is enough to trace out the limiting sphere ?