Changeset 455aaa1 in sasmodels
 Timestamp:
 Sep 7, 2018 11:27:02 AM (13 days ago)
 Branches:
 master, beta_approx, ticket1157, ticket1173cacheloadinfo, ticket608userdefinedweights, ticket_1156
 Children:
 6e7d7b6
 Parents:
 15a7577
 Location:
 sasmodels/models
 Files:

 2 edited
Legend:
 Unmodified
 Added
 Removed

sasmodels/models/hollow_cylinder.py
r15a7577 r455aaa1 58 58  59 59 60 L A Feigin and D I Svergun, *Structure Analysis by SmallAngle XRay and61 Neutron Scattering*, Plenum Press, New York, (1987)60 .. [#] L A Feigin and D I Svergun, *Structure Analysis by SmallAngle XRay and 61 Neutron Scattering*, Plenum Press, New York, (1987) 62 62 63 63 Authorship and Verification 
sasmodels/models/hollow_rectangular_prism.py
r0e55afe r455aaa1 2 2 # Note: model title and parameter table are inserted automatically 3 3 r""" 4 5 This model provides the form factor, $P(q)$, for a hollow rectangular6 parallelepiped with a wall of thickness $\Delta$.7 8 9 4 Definition 10 5  11 6 12 The 1D scattering intensity for this model is calculated by forming 13 the difference of the amplitudes of two massive parallelepipeds 14 differing in their outermost dimensions in each direction by the 15 same length increment $2\Delta$ (Nayuk, 2012). 7 This model provides the form factor, $P(q)$, for a hollow rectangular 8 parallelepiped with a wall of thickness $\Delta$. The 1D scattering intensity 9 for this model is calculated by forming the difference of the amplitudes of two 10 massive parallelepipeds differing in their outermost dimensions in each 11 direction by the same length increment $2\Delta$ (\ [#Nayuk2012]_ Nayuk, 2012). 16 12 17 13 As in the case of the massive parallelepiped model (:ref:`rectangularprism`), … … 61 57 \rho_\text{solvent})^2 \times P(q) + \text{background} 62 58 63 where $\rho_\text{p}$ is the scattering length of the parallelepiped,64 $\rho_\text{solvent}$ is the scattering length of the solvent,59 where $\rho_\text{p}$ is the scattering length density of the parallelepiped, 60 $\rho_\text{solvent}$ is the scattering length density of the solvent, 65 61 and (if the data are in absolute units) *scale* represents the volume fraction 66 (which is unitless). 62 (which is unitless) of the rectangular shell of material (i.e. not including 63 the volume of the solvent filled core). 67 64 68 65 For 2d data the orientation of the particle is required, described using … … 73 70 74 71 For 2d, constraints must be applied during fitting to ensure that the inequality 75 $A < B < C$ is not violated, and hence the correct definition of angles is preserved. The calculation will not report an error, 76 but the results may be not correct. 72 $A < B < C$ is not violated, and hence the correct definition of angles is 73 preserved. The calculation will not report an error if the inequality is *not* 74 preserved, but the results may be not correct. 77 75 78 76 .. figure:: img/parallelepiped_angle_definition.png … … 99 97  100 98 101 R Nayuk and K Huber, *Z. Phys. Chem.*, 226 (2012) 837854 99 .. [#Nayuk2012] R Nayuk and K Huber, *Z. Phys. Chem.*, 226 (2012) 837854 100 101 102 Authorship and Verification 103  104 105 * **Author:** Miguel Gonzales **Date:** February 26, 2016 106 * **Last Modified by:** Paul Kienzle **Date:** December 14, 2017 107 * **Last Reviewed by:** Paul Butler **Date:** September 06, 2018 102 108 """ 103 109
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