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Paul Scherrer Institut PSI GEM Software (GEMS) Home

Paul Scherrer Institut
5232 Villigen PSI, Schweiz/Switzerland
Tel. +41 56 310 21 11
Fax. +41 56 310 21 99

E-Mail: gems2.support@psi.ch

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GEM-Selektor Development Status


  • MILESTONE: Release of the Test Suite for GEM-Selektor v.3.5 package (TBD).
  • Development of TKinMet class library for mineral-fluid reaction kinetics and time-dependent trace element uptake.
  • Development of TSorpMod extension of TSolMod class library for surface complexation and ion exchange models.

  • Development of more phase models of mixing for the TSolMod class library, incl. sublattice solid solutions.

  • Development of the GEM2MT module for testing robustness of chemical system definition in simplified 1D or box-flux coupled mass transport-chemistry modeling (collaborators S.Dmitrieva, F.Enzmann, Th.Wagner)
  • Development of a UnSpace module for the model sensitivity analysis in "uncertainty space" (suspended).


  • Release of GEM-Selektor v 3.4.2 and GEMS3K v 3.4.2 with the ClaySor sorption model added and many bugfixes.
  • Release of GEM-Selektor v 3.3.3 and GEMS3K v 3.3 with the extended Phase module and part of TKinMet functionality.

  • GEM-Selektor v.3.2.3 release candidate rev.2554.952 open for download. Bugfix release based on Qt 5.2.1.

  • GEM-Selektor v.3.2.2 release candidate rev.2530.930 open for download. Bugfix release based on Qt 5.2.0.

  • GEM-Selektor v.3.2.1 release candidate rev.2482.890 open for download. Contains a new Phase Information wizard and updated test projects.
  • GEM-Selektor v.3.2 release candidate rev.2370.830 open for download. Contains updated default TDB and improved Graphics Dialog.
  • Implementation of improved GraphicsDialog based in part on the work of the Qwt project (http://qwt.sf.net).
  • MILESTONE: Release of the updated default thermodynamic database (TDB) with the  PSI/Nagra 12/07 database.
  • GEM-Selektor v.3.1 release candidate rev.2282.780 and the standalone GEMS3K code (rev.790) open for download from this web site.
  • Post-SKIN-Workshop GEM-Selektor v3 Training Event (Trace element uptake in aqueous - solid solution systems), PSI OFLA/402, 23.Nov.2012
  • MILESTONE: the standalone GEMS3K code (rev.760) released open-source for archive download from this web site.
  • MILESTONE: the GEM-Selektor v.3.1 package r.2230.760 released for download from this web site (Windows 32bit, linux 32 and 64 bit, Mac OS X 64 bit).
  • Standalone GEMS3K program for coupled simulation codes (foreseen to be distributed open source). Already used in OGS-GEMS, CSMP++GEMS and MCOTAC-GEM reactive mass transport codes.

  • GEM-Selektor v.2.2.3-PSI package interim released in  Win32, Linux32/64 and Mac OS X 10.5 versions  (Smart Initial Approximation mode introduced).
  • GEM-Selektor v.2.2.0-PSI package released in  Win32, Linux32 and Linux64 versions (still with incomplete documentation).
  • First prototype of standalone GEMIPM2K program for building coupled fluid-mass-transport - GEM chemistry modeling codes (TNode level interface completed)
  • Perfomance optimization of the GEM IPM-2 numerical kernel module for coupled models and uncertainty/sensitivity studies (2 to 30 times faster). 

  • GEM-Selektor v.2.1.2-PSI package released in  Win32, Linux32 and Linux64 versions.

  • GEM-Selektor v.2.1.0-PSI package released in  Win32, Linux32 and Mac OS X versions.
  •  ACTINET short course on aqueous - solid solution (AqSS) systems with GEMS-PSI tutorial (PSI, November 2005)
  •  GEM-Selektor v.2.0.0-PSI package released in  Win32, Linux32 and Mac OS X versions.
  • Windows32 installer for GEM-Selektor v.2-PSI is available since release candidate 4 (rc4).
  • Screenshot online tutorial extended to partitioning equilibria involving solid solutions and surface complexation (done).  
  • Preparation of "complementary" GEM-Selektor default chemical thermodynamic database - imported SLOP98.DAT (done).
  • Preparation of the GEM-Selektor v.2.0.0-PSI release candidate on web site of LES PSI (done). 

  • Construction of this web home page for the distribution of GEM-Selektor version 2-PSI geochemical modelling package (done).

  • Pilot study on geochemical modelling of aquatic systems under uncertainty of input parameters using GEM IPM (collaborators: K.V.Chudnenko, M.V.Artimenko, I.K.Karpov; Institute of Geochemistry, Irkutsk, Russia); Done; report in preparation.

  • Adding the "stepwise" (debugging) mode for calculations of equilibria and process simulators (S. Dmitrieva; done). 

  • Format script interpreter in GEMS code (done in February-April 2002) and library of print- and export format scripts and template math scripts in default database (version 0 prepared in August 2002).

  • Development of a high-precision IPM-2 non-linear minimization module of GEMS-PSI v2.x code (a collaborative project with I.K.Karpov and K.V.Chudnenko, Institute of Geochemistry, Irkutsk, Russia): PSI TM-44-02-06 (with appendix).

  • Improvement of GEMS version 2 GUI (graphical user interface), graphical presentation modules, and database file management tools to increase the efficiency of modelling work: done in spring - summer 2002. 

  • Preparation of the GEMS-PSI version of Nagra-PSI Chemical Thermodynamic Data Base 01/01: PSI TM 44-03-04 (1 MB), replaces TM-44-02-09.

  • Short Course "Numerical Techniques in Geochemical Thermodynamics" (D. Kulik and M.Kersten),  held on  24 - 28 September 2001 at the Geosciences Institute, Johannes Gutenberg-Universitšt, Mainz, Germany (17 participants).

Last updated:  24. 07. 2018

Copyright (c)  2003-2018  GEMS Development Team.