Free neutron scattering software for linux

Visual difference metrics can predict whether differences between two images are visible to the human observer or not. Such metrics are used for testing either visibility of information (whether we can see important visual information) or visibility of noise (to make sure we do not see any distortions in images, e.g. due to lossy compression).

The image below shows how two input images, a reference image (upper left) and a distorted image (lower left), are processed with the VDP to produce a probability of detection map (right). Such probability of detection map tells how likely we will notice a difference between two images for each part of an image.

Red color denotes high probability, green - low probability. Red color is mostly present in the areas where there is a snow covered path. Because of smooth texture of the snow, there is not much visual masking and distortions are easily visible.

Although there are dozens of visible difference metrics that serve a similar purpose, our Visual Difference Predictor for HDR images (HDR-VDP) has two unique advantages: firstly, our metric works with a full range of luminance values that can be meet in a real word (HDR images), and secondly, we offer a complete source code for free.

High Dynamic Range Visible Difference Predictor (HDR-VDP) can work within the complete range of luminance the human eye can see. An input to our metric is a high dynamic range (HDR) image, or an ordinary 8-bits-per-color image, converted to the actual luminance values. The proposed metric takes into account the aspects of high contrast vision, like scattering of the light in the optics (OTF), nonlinear response to light for the full range of luminance, and local adaptation.

Einstein@GNOME is a GNOME panel applet that lets you participate in the Einstein@Home neutron star search.

It is a frontend for the boinc client and was developed because there are no other decent GUIs available yet.

EMWave2D project is a 2D electromagnetic wave simulation program. It solves Maxwells equation using Finite Difference Time Domain (FDTD) method.

It is very simple program to use and to modify. It can do many different simulations such as scattering, diffraction, and refraction.

McStas project is a general tool for simulating neutron scattering instruments.
McStas is a computer program (written in C) that enables you to model very precisely a neutron instrument described as a series of various components.
A source component shoots each neutron randomly (Monte-Carlo), and the particle is then propagated through the different instrument components.
These later act on the neutron characteristics (position, speed, direction, spin, etc.).
Usually, one installs some detectors along the neutron path to monitor its characteristics and flux.
Enhancements:
- General
- Update release, mainly bugfixes plus a few other things
- Documentation
- Component manual slightly updated according to adding/modification of components.
- Tools
- mcgui: A few bugfixes.
- Components
- DiskChopper.comp - new disc chopper component. Chopper.comp made obsolete. See mcdoc page / component manual for further details.
- Guide.comp - reads reflectivity tables from disk.
- Isotropic_Sqw - minor bugfixes, validated against PowerN, V_sample, etc.
- PowderN - validated against Isotropix_Sqw, Squires, experimental data.