# Shape-Independent

Name Description Category Upload Date Author Score Verified
Guinier Porod Calculates the scattering for a generalized Guinier/power law object. This is an empirical model that can be used to determine the size and dimensionality of scattering objects, including asymmetri... Shape-Independent 15 Sep 2016 sasview 0
RPA models Calculates the macroscopic scattering intensity for a multi-component homogeneous mixture of polymers using the Random Phase Approximation. This general formalism contains 10 specific cases Case... Shape-Independent 15 Sep 2016 butler 0
star_polymer_v2 Reparametrised version, fits Rg not Rg^2^ Documentation corrected, see ticket #962, with grateful thanks to Ziang Li for pointing out the issues. The models is still noisy at very small Q when Rg... Shape-Independent 22 May 2017 richardh 0
Porod This model fits the Porod function $$I(q) = C/q^4$$ to the data directly without any need for linearisation (cf. Log I(q) vs Log q). Here $C = 2\pi (\Delta\rho)^2 S_v$ is the scale factor ... Shape-Independent 07 Sep 2017 sasview 0
Peak Lorentz This model describes a Lorentzian shaped peak on a flat background. Definition The scattering intensity $I(q)$ is calculated as $$I(q) = \frac{scale}{\bigl(1+\bigl(\frac{q-q_0}{B}\big... Shape-Independent 07 Sep 2017 sasview 0 Broad Peak Definition This model calculates an empirical functional form for SAS data characterized by a broad scattering peak. Many SAS spectra are characterized by a broad peak even though they are fr... Shape-Independent 07 Sep 2017 sasview 0 Mass Surface Fractal A number of natural and commercial processes form high-surface area materials as a result of the vapour-phase aggregation of primary particles. Examples of such materials include soots, aerosols... Shape-Independent 07 Sep 2017 sasview 0 Rpa Definition Calculates the macroscopic scattering intensity for a multi-component homogeneous mixture of polymers using the Random Phase Approximation. This general formalism contains 10 speci... Shape-Independent 07 Sep 2017 sasview 0 Poly Gauss Coil #poly_gauss_coil model #conversion of Poly_GaussCoil.py #converted by Steve King, Mar 2016 This empirical model describes the scattering from *polydisperse* polymer chains in theta solvents or poly... Shape-Independent 07 Sep 2017 sasview 0 Be Polyelectrolyte .. note:: Please read the Validation section below. Definition This model calculates the structure factor of a polyelectrolyte solution with the RPA expression derived by Borue and Erukhimovi... Shape-Independent 07 Sep 2017 sasview 0 Polymer Excl Volume This model describes the scattering from polymer chains subject to excluded volume effects and has been used as a template for describing mass fractals. Definition The form factor was orig... Shape-Independent 07 Sep 2017 sasview 0 Mass Fractal Calculates the scattering from fractal-like aggregates based on the Mildner reference. Definition The scattering intensity I(q) is calculated as$$ I(q) = scale \times P(q)S(q) + bac... Shape-Independent 07 Sep 2017 sasview 0
Gel Fit *This model was implemented by an interested user!* Unlike a concentrated polymer solution, the fine-scale polymer distribution in a gel involves at least two characteristic length scales, a sho... Shape-Independent 07 Sep 2017 sasview 0
Spinodal Definition This model calculates the SAS signal of a phase separating system undergoing spinodal decomposition. The scattering intensity $I(q)$ is calculated as $$I(q) = I_{max}\frac{(1+\... Shape-Independent 07 Sep 2017 sasview 0 Gaussian Peak Definition This model describes a Gaussian shaped peak on a flat background$$ I(q) = (\text{scale}) \exp\left[ -\tfrac12 (q-q_0)^2 / \sigma^2 \right] + \text{background} $$with the ... Shape-Independent 07 Sep 2017 sasview 0 Teubner Strey Definition This model calculates the scattered intensity of a two-component system using the Teubner-Strey model. Unlike dab this function generates a peak. A two-phase material can be char... Shape-Independent 07 Sep 2017 sasview 0 Fractal Definition This model calculates the scattering from fractal-like aggregates of spherical building blocks according the following equation:$$ I(q) = \phi\ V_\text{block} (\rho_\text{block} ... Shape-Independent 07 Sep 2017 sasview 0
Lorentz Lorentz (Ornstein-Zernicke Model) Definition The Ornstein-Zernicke model is defined by $$I(q)=\frac{\text{scale}}{1+(qL)^2}+\text{background}$$ The parameter $L$ is the screening len... Shape-Independent 07 Sep 2017 sasview 0
Power Law #power_law model #conversion of PowerLawAbsModel.py #converted by Steve King, Dec 2015 This model calculates a simple power law with a flat background. Definition $$I(q) = \text{scale... Shape-Independent 07 Sep 2017 sasview 0 Line This model calculates intensity using simple linear function Definition The scattering intensity I(q) is calculated as$$ I(q) = \text{scale} (A + B \cdot q) + \text{background}  ... Shape-Independent 07 Sep 2017 sasview 0

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