Andrew

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	156 reputation	bio	website		visits	member for	1 year, 9 months
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May 10	accepted	How do I integrate the Poisson equation to determine the electric potential along a particular direction (e.g., $z$)?
May 10	accepted	What are the differences between the terms flammable, inflammable, and non-flammable?
May 9	accepted	In the Lennard-Jones potential, why does the attractive part (dispersion) have an $r^{-6}$ dependence?
May 8	awarded	Nice Question
May 7	asked	Is there a typo in this modified Lennard-Jones potential?
May 1	comment	In the Lennard-Jones potential, why does the attractive part (dispersion) have an $r^{-6}$ dependence? @JohnRennie OK, thanks. I was thinking that the derivation would involve a dipole-dipole interaction, but I guess it is more complicated than that.
May 1	asked	In the Lennard-Jones potential, why does the attractive part (dispersion) have an $r^{-6}$ dependence?
Apr 17	asked	Deriving the change in the Helmholtz free energy in the context of the free energy perturbation method
Apr 12	awarded	Popular Question
Mar 10	comment	The number of degrees of freedom of a monatomic gas Thanks for your time. What if the center of mass is not at rest? Then would the system have $3N - 3$ degrees of freedom instead of $3N$?
Mar 10	comment	The number of degrees of freedom of a monatomic gas @Cheeku So each atom in my monatomic system has only translations (three of them). But I would like to compute, for example, the average kinetic energy of the entire system: $\langle K \rangle = 3N_f kT/2$, in which I think $N_f$ is indeed the number of degrees of freedom of the entire $N$ atoms/molecules, not just one of them.
Mar 10	asked	The number of degrees of freedom of a monatomic gas
Feb 12	awarded	Custodian
Dec 15	asked	Can one compute the vibrational spectrum of a bond by the Fourier transform of the dipole moment vector autocorrelation function $C_{\mu\mu}(t)$?
Aug 29	accepted	In $\textbf{f} = -\boldsymbol{\nabla} u$, what is $u$?
Aug 27	asked	In $\textbf{f} = -\boldsymbol{\nabla} u$, what is $u$?
Aug 13	comment	How do I integrate the Poisson equation to determine the electric potential along a particular direction (e.g., $z$)? @Shaktyai Yes, I know that $\phi(z = -z_0) = 0$; that is the definition that is used (albeit implicitly) in the paper. I don't think I know the value of the potential on the second plane of the slab; I think that it depends on an integral of $\rho$.
Aug 13	comment	How do I integrate the Poisson equation to determine the electric potential along a particular direction (e.g., $z$)? Thanks so much for your time. Can you please elaborate on why "the total electric field in a point $z$ is the difference of the contributions of planes before $z$ and after $z$"? How do you obtain expressions for $E_1(z)$ and $E_2(z)$ (in particular, how do you determine the limits of integration in the expressions for $E_1(z)$ and $E_2(z)$?)? Also, why is $E(z) = E_1(z) - E_2(z)$?
Aug 9	revised	How do I integrate the Poisson equation to determine the electric potential along a particular direction (e.g., $z$)? clarified question
Aug 9	accepted	The appearance of volume $V$ in the Fourier series representation of a periodic cubic system