Does anyone know of anywhere on the internet where I may find a spreadsheet containing the names of the 230 space groups?
In a perfect world this would simply be a csv file containing the schoenflies and hermann-maguin notations; but I can't be too picky.
Thanks
I have some XPS spectrums that I am trying to fit (my first time doing so), using XPSpeak.
I understand that for spin-orbit splitting the FWHM, line shape (i.e.% gaussian/lorentzian) must be equal (more or less), peak area ratios set (i.e. 2:3 for 3d3/2 and 3d5/2), and the peak separation...
I've heard any many places that the density of states (DOS) can be determined from an x-ray photoelectron spectroscopy (XPS) spectrum.
Perhaps someone more knowledgeable than me can explain how this is done, or can direct me to a good resource?
Thanks!
I figured it out using the method described in sec 6.1 of http://www.ece.rutgers.edu/~orfanidi/ewa/ch06.pdf along with my own implementation in python.
I found this: http://www.filmetrics.com/reflectance-calculator an online calculator that calculates the reflectance of a multi-layer system.
They mention they used the "complex matrix form" of the Fresnel equations. I'm guessing that means the scattering/wave-transfer matrices?
I would imagine that in the end I want to get the reflectance as a function of wavelength which will essentially divulge the color information.
To get there I'm guessing I need to first use the fresnel equations to determine transmittance/reflectance for each layer. Then use the resulting...
Hello, as you might have guessed, my question revolves around thin film optics. My intention is: Given a two thin-film system residing on top of a semi-infinite (bulk) layer, how can I estimate the reflecting color (RGB preferably) when illuminated by white light? (Illustrated below).
I...
Homework Statement
The linear thermal expansion coefficient of aluminum is 22.2x10-6 m/m K and that of alumina is 5.4x10-6 m/m K. If the criterion for onset of dislocation plasticity is related to thermal mismatch exceeding Burgers vector for aluminum, which is 2.8x10-10 m. What is the...
Homework Statement
The width of the potential well of an electron can be assumed to be 2angstrom. Calculate the energy of an electron (in joules and eV) from this information for various values of n.
I believe I have messed up my units somewhere in the final calculation, but I have...
We have an ashtray on an elevated table in our balcony.
No one was outside and it suddenly fractured into 4 nearly even pieces on the table. Strangely enough, all the cigarette buds were lit.
This is the ashtray we used...
So I will return to this step:
\frac{dT}{dt}=\frac{2h}{\rho C_vr}(T_i-T_f)
Which was supposed to be:
\frac{dT}{dt}=\frac{2h}{\rho C_vr}(T_f-T)
Since the last T now depends on time, I will need to move it over to the left of the equation.
\frac{dT}{dt}+\frac{2h}{\rho C_vr}T=\frac{2h}{\rho...
I think I got it now, It didn't occur to me to actually write out the thermal energy in the control volume.
\frac{dE_T}{dt}=\frac{∂}{∂t}\int\int\int_\Omega \rho C_vTd\Omega
\frac{∂}{∂t}\int\int\int_\Omega \rho C_vTd\Omega=(\int\int_A \rho C_vTvdA)_{in}-(\int\int_A \rho C_vTvdA)_{out}+Q+S
From...
Homework Statement
The adiabatic bulk modulus is defined as:
\beta_s=-V(\frac{∂P}{∂V})_s
Express it in terms of experimental variables: C_p, C_v, \alpha, \beta
Homework Equations
Heat capacity at constant pressure:C_P=(\frac{∂Q}{∂T})_P
Heat capacity at constant volume:C_V=(\frac{∂Q}{∂T})_V...
I have a hunch that is the case since there is no mention of an IC (but I took the assumption that since there is a different T at both ends, there would be an initial T distribution, f(z)).
I am not totally sure though since they didn't explicitly state "steady-state" like they do in other...
Here is a screenshot of my professors notes I took these equations from.
This is our book:
https://www.amazon.com/dp/0521651514/?tag=pfamazon01-20
What equations would you have used?
Homework Statement
Calculate the Madelung constant for an octahedral arrangement of doubly charged anions about a doubly charged cation. Use r0 for the anion−cation distance. (Hint: Remember that the Madelung constant considers the sum of Coulomb interactions over all atom/ion pairs)...
Homework Statement
Show that in a reversible adiabatic process, for 1 mole of ideal gas
P1V1γ=P2V2γ
Where,
γ=CP/CV
Homework Equations
Listed above.
The Attempt at a Solution
Frankly, I don't really understand what I'm being asked to do.
Attached pdf contains the problem, and my progress in working it.
My question is, I'm not really sure how to proceed. Anyone care to push me in the right direction?
I'm curious how to solve Fick's second law of diffusion \frac{∂c}{∂t}=D \frac{∂^2c}{∂x^2}For conditions:c(x,0)=0c(0,t)=Ac(\infty,t)=0Physically this means:
-c(x,t) is the concentration at point x at time t.
-Initially there is no concentration of diffusing species.
-At x=0 for all t the is a...
I'm looking for a good resource about modelling for differential equations. I've completed two courses on ODE's and PDE's, but they both lacked in the applications/modelling department.
Can anyone recommend a good resource/book on modelling?
So a battery to one of my phones got left in the car (just the battery) for an extended period of time during a Texas summer.
The sides of the battery expanded by a couple millimeters. But I can compress the sides with my fingers as if there was a pocket of air in between the outer tape (with...
Homework Statement
Solve using variation of parameters
y''' - 2y'' - y' + 2y = exp(4t)
Homework Equations
Solve using variation of parameters
The Attempt at a Solution
I got the homogenous solutions to be 1, -1, and 2.
So, y = Aexp(t) + Bexp(-t) + Cexp(2t) + g(t)
I got...
I was wondering what the driving force behind polymorphism is. What causes polymorphic materials to change crystal structures at certain temperatures? Such as the iron phases alpha-ferrite, gamma-austenite, delta-ferrite, hexaferrum?