 Welcome to
GEM-Selektor
(GEMS)
Research package
for thermodynamic modelling of aquatic
(geo)chemical systems by Gibbs
Energy Minimization
The GEMS code
package offers high chemical
plausibility of equilibrium thermodynamic models
- Stable and metastable minerals are selected using rigorous phase
stability criteria
- Aqueous equilbria may involve many (non)ideal
solid or liquid solutions, gas mixture and/or non-ideal fluids
- Multi-site-surface complexation on
mineral-water interfaces can be computed,
also without site balances
- Redox state is calculated from the bulk chemical composition of
the
system
- Processes of irreversible chemical mass
transfer can be simulated using principles of local and partial
equilibrium
- Thermodynamic data are automatically corrected for temperature
and pressure
- Numerical kernel GEMS3K
can be coupled to mass-transport codes (coming soon)
- And much more...
The complexity of
chemical system setup is limited mainly by the
availability of
thermodynamic data for species and phases.
A default thermodynamic database is the Nagra/PSI
chemical thermodynamic data base 01/01, enhanced with the
imported SUPCRT-98 database.
Third-party
databases for specific
applications, for instance for cements (Cemdata), are
available in GEMS format.
To learn quickly
how to work with the user-friendly GEMS code (version 2):
- download it; install; in your web browser, open this web
page, click on
the "Online Tutorial"
link; run the code in parallel with reading the
Screenshot Tutorial.
If you
experience problems, please e-mail us, or go to a "Support" link and
send us a bug report form.
A major upgrade to
GEMS version 3 is in preparation. See more about GEMS3 under Latest News.
GEMS software
package is still under development. GEMS is distributed "as is" by the
Laboratory for Waste Management (LES) of the Paul Scherrer Institute
(PSI) with two purposes:
- to promote the GEM method and software into academic
research community;
- to gather the users feedback - vital for making the software more
functional and reliable.
Permission to
use the GEM-Selektor software is hereby granted free
of charge for educational
and academic research purposes, subject to Terms and Conditions of
Use.
GEMS Development and
Support Team
Disclaimer
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