IRIS DEVELOPMENT LLC, 14 Elm Street, Amherst, MA 01002-2007, USA
Email: Karin Winter -

The IRIS Mission:
IRIS stands for Interactive Rheology Information System. Our mission is to identify and overcome barriers to understanding and applying rheology. To do so, we use scalable rheology solutions that empower the science and engineering community to solve real-world problems. Our software platform, which supports this mission, has a central hub (IRIS Rheo-Hub) where rheological experiments and advanced theories can be easily juxtaposed so they can be efficiently analyzed, compared, categorized, viewed, “smart-plotted” and parameterized. A Smart Plot (SP) includes all its provenance; a single mouse click returns you to SP’s source data for further analysis and rheological modeling. - Our hub evolved over many years, and with the help of many contributors, and is known for its easy-to-use interface. In this way, the IRIS environment stimulates discovery and prepares for decision making.

10 Year Anniversary of IRIS:
Winter HH, Mours M (2006) The cyber infrastructure initiative for rheology. Rheologica Acta 45:331-338
25 Year Anniversary of IRIS:
Poh L, Narimissa E, Wagner MH, Winter HH (2022) Interactive shear and extensional rheology-25 years of IRIS software. Rheologica Acta 61:259-269

IRIS Development LLC is a rheology consulting company. It was founded in 1996 and registered officially in January of 2007 as successor of a partnership between H. Henning Winter and Marian Mours. H. Henning Winter is the sole member of the LLC (status Jan 2007). IRIS Development LLC holds all copyrights on "Rheo-Hub", the IRIS platform program for creative rheology work. Rheo-Hub supports rheological data exploration, data analysis, rheological modeling, data sharing, and repository. It is a platform at which the world's leading rheologists share their modeling codes.

"IRIS" is the abbreviation for Interactive Rheology Information Systems.

Authors of Rheo-Hub:
* Marian Mours, Germany
* H. Henning Winter, USA
in collaboration with:
* Michael Baumgaertel, Germany
* Richard J Blackwell, UK
* Ron Larson, USA
* Manfred Wagner, Germany
* Yuichi Masubuchi, Japan
* Rosella Nobile and Franco Cocchini, Italy
* several more experts

Architects of Rheo-Hub

Dr. Marian Mours
Mours is currently working for a major German chemical company. He received his Ph.D. with H. Henning Winter at UMass Amherst in 1997. He also holds a diploma in chemical engineering from the University of Karlsruhe, Germany. In his Ph.D. work, he studied the rheological behavior of nearly critical gels. During his time in Amherst, he was involved in developing the Time Resolved Mechanical Spectroscopy (TRMS) approach for studying materials with changing properties. After having returned to Germany, Mours converted the IRIS code from DOS to visual C++ and added many new features and capabilities.

Professor H. Henning Winter
Winter's long-standing interest in experimental rheology began about 30 years ago when he could not find suitable rheological material data for his numerical calculations. Soon it became obvious that obtaining rheological data was not the main problem; converting these data into useful rheological material functions such as time spectra, viscosity, and modulus was the most difficult step. Little help was available here. A breakthrough came with Baumgaertel’s 1987 discovery of a robust method of converting dynamic mechanical data from the frequency to the time domain. This suddenly allowed an efficient data analysis and gave increased insight into the underlying phenomena. Since then, after much collaborative work, the data analysis methods have become user-friendly and comprehensive while giving answers within minutes. The new methods have found widespread application. The original code was developed in collaboration with M. Baumgaertel and P. Soskey. M. Mours converted the original DOS code to visual C++ and introduced many methods from the literature. Recently, in collaboration with international experts, we extended the IRIS code and began to access molecular theory, non-linear viscoelasticity theory, and molecular simulation.
Winter ( has been educated mostly in Stuttgart, Germany, but he also studied in Berlin (Germany), Stanford (California), and Madison (Wisconsin). He is faculty at the University of Massachusetts Amherst since 1979. He received the Bingham Medal of the Society of Rheology, the v. Humboldt Price, and a Creativity Award of NSF. Winter is editor of Rheologica Acta from 1989 to 2016. Winter and his group have been studying the rheology of polymers near transition states (phase separation, ordering transitions, connectivity transitions, crystallization, electric field induced gelation) with a wide range of experimental methods. Besides experimental rheology, Winter's group also develops novel polymeric materials through processing.

Publications of Winter and Coworkers.

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