# Changeset 455aaa1 in sasmodels

Ignore:
Timestamp:
Sep 7, 2018 11:27:02 AM (13 days ago)
Branches:
master, beta_approx, ticket-1157, ticket-1173-cache-loadinfo, ticket-608-user-defined-weights, ticket_1156
Children:
6e7d7b6
Parents:
15a7577
Message:

update hollow_rectangular_prism docs

Add statement about vol fraction being for shell only. Also fix typos,
clean up/normalize ref and authorship sections and fix/normalize
hollow_cylinder refs and authorship

Location:
sasmodels/models
Files:
2 edited

### Legend:

Unmodified
 r0e55afe # Note: model title and parameter table are inserted automatically r""" This model provides the form factor, $P(q)$, for a hollow rectangular parallelepiped with a wall of thickness $\Delta$. Definition ---------- The 1D scattering intensity for this model is calculated by forming the difference of the amplitudes of two massive parallelepipeds differing in their outermost dimensions in each direction by the same length increment $2\Delta$ (Nayuk, 2012). This model provides the form factor, $P(q)$, for a hollow rectangular parallelepiped with a wall of thickness $\Delta$. The 1D scattering intensity for this model is calculated by forming the difference of the amplitudes of two massive parallelepipeds differing in their outermost dimensions in each direction by the same length increment $2\Delta$ (\ [#Nayuk2012]_ Nayuk, 2012). As in the case of the massive parallelepiped model (:ref:rectangular-prism), \rho_\text{solvent})^2 \times P(q) + \text{background} where $\rho_\text{p}$ is the scattering length of the parallelepiped, $\rho_\text{solvent}$ is the scattering length of the solvent, where $\rho_\text{p}$ is the scattering length density of the parallelepiped, $\rho_\text{solvent}$ is the scattering length density of the solvent, and (if the data are in absolute units) *scale* represents the volume fraction (which is unitless). (which is unitless) of the rectangular shell of material (i.e. not including the volume of the solvent filled core). For 2d data the orientation of the particle is required, described using For 2d, constraints must be applied during fitting to ensure that the inequality $A < B < C$ is not violated, and hence the correct definition of angles is preserved. The calculation will not report an error, but the results may be not correct. $A < B < C$ is not violated, and hence the correct definition of angles is preserved. The calculation will not report an error if the inequality is *not* preserved, but the results may be not correct. .. figure:: img/parallelepiped_angle_definition.png ---------- R Nayuk and K Huber, *Z. Phys. Chem.*, 226 (2012) 837-854 .. [#Nayuk2012] R Nayuk and K Huber, *Z. Phys. Chem.*, 226 (2012) 837-854 Authorship and Verification ---------------------------- * **Author:** Miguel Gonzales **Date:** February 26, 2016 * **Last Modified by:** Paul Kienzle **Date:** December 14, 2017 * **Last Reviewed by:** Paul Butler **Date:** September 06, 2018 """