Recent content by Hello890

From Finn's Thermal Physics book, it gives a similar situation where the adiabatic work W = U(final) - U(initial), and later states that this relation holds whether the process is reversible or not. It says this is true as W is now simply a function of state variables and therefore is path...

The Helmholtz function differential form for a reversible process is: dF = -SdT - PdV, as for a reversible process δW (by system/here an (ideal) gas) = PdV and dS = δQ/T. Therefore, for a reversible isothermal process, dT = 0 and hence dF = -PdV. Therefore, the work done by the system is W =...

Yes, unfortunately the equipment we were given was not well aligned and so an offset had to be taken into account. Should I perhaps identify the planes using the ratio of the sin^2(measured angle 1) / sin^2(measured angle 2 - of next peak) = (h1^2 + k1^2 + l1^2)/ n^2(h2^2 + k2^2 + l2^2)? Would...

Can I safely say that the planes identified are indeed the correct ones, even though the plane of the cut of the crystal is unknown? Also, can I use the method in http://pd.chem.ucl.ac.uk/pdnn/diff2/structf.htm to calculate the relative intensities, will the formula work for single crystals as well?

Many thanks for your reply. Unfortunately I am not allowed to powder the sample. Also, could I use standard techniques for powder sample calcuations to calculate the relative intensities of the peaks for this single crystal?

Many thanks for your reply. I have find the values of h, k, l as being closest to (2, 0, 0), (4, 0, 0), (6, 0, 0) as my parallel planes. Could I use to justify that the structure of the crystal is face-centered cubic?

In my x-ray crystallography data for a single crystal of NaCl using x-rays generated by Cu k alpha (154 pm), there are three peaks identified at angles of 14.155, 31.475 and 53.5 degrees. According to http://www.nada.kth.se/~fabo02/solid/xray.pdf, these peaks must correspond to only even values...

I am able to find methods on how to index Bragg peaks for powder diffraction, and was wondering if the method is the same for single cubic crystals of NaCl? I have tried and cannot get the expected sequence of allowed reflections for cubic lattices (h^2 + k^2 + l^2= 3, 4, 8, 11, 12, 16, 19...

Hello, I have found references giving the equation for an ABC model for GaN-based LEDs (see: file://icnas3.cc.ic.ac.uk/lsm16/materials-10-01233.pdf), but I am not able to find any for simple GaAs infrared LEDs (LED information: https://uk.rs-online.com/web/p/ir-leds/8108247/#). Does similar...

Thank you very much for the help

Yes, that is the case. However, it was more to ask if the grid was the electrode of the fusor, or if the grid was the just the general containment of the plasma. Therefore, would the grid loss mean the deterioration of the electrode, or the loss of the control of the plasma.

Hello, I would like to ask for a definition the grid loss problem for fusion in inertial confinement fusion methods using fusors, and what it involves. Also, it was to ask what the main solutions being currently researched are, as it is very difficult to find papers on this field. Many thanks...