# Shape-Independent

Name Description Category Upload Date Author Score Verified
Two Power Law Definition The scattering intensity $I(q)$ is calculated as $$I(q) = \begin{cases} A q^{-m1} + \text{background} & q <= q_c \\ C q^{-m2} + \text{background} & q > q_c \end{cases}$$ whe... Shape-Independent 07 Sep 2017 sasview 0
Unified Power Rg Definition This model employs the empirical multiple level unified Exponential/Power-law fit method developed by Beaucage. Four functions are included so that 1, 2, 3, or 4 levels can be used... 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: $$I(q) = \phi\ V_\text{block} (\rho_\text{block} ... Shape-Independent 07 Sep 2017 sasview 0 Correlation Length #correlation length model # Note: model title and parameter table are inserted automatically Definition The scattering intensity I(q) is calculated as$$ I(Q) = \frac{A}{Q^n} + \frac{C}{1 ... 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 $$I(q) = \frac{scale}{\bigl(1+\bigl(\frac{q-q_0}{B}\big... Shape-Independent 07 Sep 2017 sasview 0 Gel Fit *This model was implemented by an interested user!* Unlike a concentrated polymer solution, the fine-scale polymer distribution in a gel involves at least two characteristic length scales, a sho... Shape-Independent 07 Sep 2017 sasview 0 Power Law #power_law model #conversion of PowerLawAbsModel.py #converted by Steve King, Dec 2015 This model calculates a simple power law with a flat background. Definition$$ I(q) = \text{scale... Shape-Independent 07 Sep 2017 sasview 0
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
Spinodal Definition This model calculates the SAS signal of a phase separating system undergoing spinodal decomposition. The scattering intensity $I(q)$ is calculated as $$I(q) = I_{max}\frac{(1+\... Shape-Independent 07 Sep 2017 sasview 0 Guinier Definition This model fits the Guinier function$$ I(q) = \text{scale} \cdot \exp{\left[ \frac{-Q^2 R_g^2 }{3} \right]} + \text{background} $$to the data directly without any need for l... Shape-Independent 07 Sep 2017 sasview 0 Line This model calculates intensity using simple linear function Definition The scattering intensity I(q) is calculated as$$ I(q) = \text{scale} (A + B \cdot q) + \text{background}  ... Shape-Independent 07 Sep 2017 sasview 0
broad-peak (SASfit) This file has been automatically generated by sasfit_convert and manually edited by Wojciech Potrzebowski, ESS on 2017-12-05. The model calculates an empirical functional form for SAS data chara... Shape-Independent 07 Dec 2017 wojciechpotrzebowski 0
Star Polymer w/ Excluded Volume This model describes scattering from a star-branched polymer where the arms of the polymer may have excluded volume, i.e., they need not be Gaussian chains. Under this model, the form factor of ... Shape-Independent 22 Aug 2018 mjahore 0
2 Layer General Guinier Porod Implementation of the 2 layer General guinier porod model described in B. Hammouda, "A new Guinier–Porod model", Journal of Applied Crystallography, 43(4), 716, 2010 Shape-Independent 03 Feb 2020 dfsunday 0
Exponential Flexible exponential model with a flat background. DEFINITION This model calculates a variety of exponential functions. The scattered intensity $I(q)$ is calculated as \$I(q) = \text{sc... Shape-Independent 07 Mar 2020 smk78 0
Binary Blend Two-component RPA model with a flat background. DEFINITION This model calculates the scattering from a two component polymer blend using the Random Phase Approximation (RPA). The two polymer... Shape-Independent 07 May 2020 smk78 0
Peak Voigt This model describes a pseudo-Voigt shaped peak on a flat background. Definition This pseudo-Voigt peak function is a weighted linear summation of Lorentzian (L) and Gaussian (G) peak shapes. T... Shape-Independent 24 Jun 2020 smk78 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

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