Key-Words: POF, LAN, LED, Phase Transitions, IR-Spectroscopy, Oligoamide, Ramanspectroscopy, Monte-Carlo, Simulation, Online-Research, World-Wide-Web, Browser, UDINE, RATEMA, Telemedicine, Satellite Communication, Multimedia, Database, Patient Record, ULKOM
Construction of Local Area Networks with Polymer Optical Fibres (T. Engst)
Data transmission via twisted-pair cable is well established in Local Area Networks (LAN). The use of Polymer Optical Fibres (POF) is an interesting alternative because of its economic advantage light weight and small dimension. Furthermore there is no electromagnetic interference. In office communication Ethernet standard is usually applied and distances of at least 100 m are to be managed to achieve extensive application of the system. The goal of this project is to set up a low-cost and an easy handling Step Index- POF- LAN that fits the above mentioned requirements as well as to check its operation and reliability. Therefore, in cooperation with Hoechst AG the University's section O25 was cabled with their Polymethylmethacrylate (PMMA)- fibre in 1994. Supported by Hirschmann GmbH & Co an active star coupler together with the according transceivers was implemented fulfilling the correct transmission with incorporated powerful Hewlett Packard red-edge light-emitting diodes (LED). Since June 1995 four workstations of Department Theoretical Physics operate with this POF set-up for long-term function tests.
RATEMA (Radiation Accident Telecommunication Medical Assistance System) (B. Pieper, R. Wedel)
RATEMA was initiated 1993 - as a succeeding project of ULKOM (see contribution of University Computing Center) - as an international Telemedicine project between the University of Ulm and the "Urals Research Center for Radiation Medicine" in Chelyabinsk (South-Ural) in Russia, officially started in 1994 and expected to be finished in 1996.
Aim is the installation and periodical use of telemedical consultations between Ulm and Chelyabinsk with the following points of interest:
Since 1949 a large part of the South Ural population has been exposed to radiation . During the videoconferences, that allow direct communication via satellite with 384 kb/s data rate, patients will be mutually presented. The results of the investigations will be stored on both sides with a multimedia patient record using the relational database management system ORACLE 7. The record contains all relevant data of the internistic examination (text, numerical data, images (microscope, X-ray, ecg, skin, ...) and videosequences) of the patient. On this base health patterns are to be established. Live consultations of the patient and also the use of a remotely controlled microscope will support the conferences. Experience will be shared and a consensus in respect to differential diagnosis and therapeutic strategies is asked to be reached.
Research in Online Information Databases (A. Payer)
From 1990 to 1993 the BMBF sponsored a project to integrate the use of electronic stored documents in physics at the universities of Germany. Beeing associated in this project our department has built structures at the University of Ulm to accomplish public access for the scientists and students. During the course of the project public retrieval facilities have been established, working places have been built and physicists and students of physics taught how to handle the electronic information efficiently. To preserve and maintain the new facilities the University provides the necessary means.
During 1994 the databases have been accessed 1944 times, worth 48.000 Deutsch Marks and 1995 the access increased to the amount of 2460 obtaining information worth 40.000 DM.
For students the research in electronic databases is an efficient contribution to shorten the length of their studies.
UdiWWW HTML3 WWW-Browser (B. Richter)
UdiWWW was established as a World-Wide Web (WWW) of UDINE Browser for the UDINE Project (University Computing Center). Because of the Client-Server architecture the implementation of standard browsers like NCSA-Mosaic was not possible without several adjustments. Since the source-text of Mosaic was not directly available we developed our own software. Since April 1995 an independent program was derived from the UDINE-WWW-Viewer. It is the only one from all common used WWW Browser which implements the most properties of the Hypertext-Markup-Language (HTML) in version 3. UdiWWW is, therefore, eg. the first Window WWW Browser capable of making HTML3 mathematical equations visible and supporting the Portable-Network-Graphics (PNG) format as well as all Netscape extension not being standardised. For that reason UdiWWW is directly in competition with the popular "Navigator" of Netscape.
Phase Transitions in Oligomeric Model Compounds (J. Gerhardt, J. Hahn, J. Schwede)
Goal of the research was to contribute to the clarification of the structure of the amorphous state. Outgoing from the fact, that suitable model compounds passes phase transitions that show before the transition in the melt a dramatically change in intramolecular conformation, we approximate the melt step by step through solid state phases. These phases result from the perfect low temperature phase by a co-operative installation of conformational chain imperfections.
With optical spectroscopy, specially Raman- and IR-Spectroscopy, it was possible to examine and determinate quantitatively the conformational changes at phase transitions. As model compounds we used cycloalkanes, linear and cyclic Oligoamides and leadalkanoates. Main research lay on these solid state phases, which go without further change of the intramolecular defect concentration in the amorphous state only by loss of long range order. Particularly in cyclic Oligoamides we could show, that in the aliphatic chains we have an increasing number of gauche defects which are responsible for the phase transition.
In our theoretical works we got a simple generalised two-dimensional model. Monte Carlo simulation of the phase behaviour of the model system showed that the model is quite adequate to describe all essential features inherent in the transitions to the conformational disordered state.
Polymer Optical Fibres: Industry, University
RATEMA: DeTeBerkom, Berlin
Phase transitions: SFB 239
Online Information Database: BMBF, University
Polymer Optical Fibres:
Dr. A. Brockmeyer, Geschäftseinheit Forschungsprodukte
Marketing INFOLITE, 65926 Frankfurt
Richard Hirschmann GmbH & Co
Dr. G. Hörcher Network Systems, Department Head, Basic Development
Stuttgarter Straße 45-51, 72654 Neckartenzlingen
Prof. Dr. Dr. h.c. mult. T. M. Fliedner,
University of Ulm,
Clinical Physiology and Institute of Occupational and Social Medicine
Dr. Alexander V. Akleyev, M.D.,
Urals Research Center for Radiation Medicine,
1994 Hahn, Jutta:
Monte-Carlo-Simulation zur Konformationsfehlordnung in Kristallen aus Lennard-Jones-Teilchen
1994 Schwede, Jens:
Ramanspektroskopische Untersuchungen zu Konformation und Phasenumwandlungen oligomerer Modellsubstanzen (Oligoamide und Bleialkanoate)
Prof. Dr. Alexander J. Pertsin, Russia, 25.02.-02.04.93
1993 VIII. Meeting of German-Chinese Society of Medicine, "Telecooperation between medical experts via broadband networks", B. Pieper, Ulm, October, 9.
1993 5th Forums discussion of the Society of Biomedical Technologies, "Chances for using telecommunication in medicine", B. Pieper, Ulm, December, 12.
1994 2nd Telemedicine Symposium, Bonn, April, 4.
1995 TeleMed 95, Medicine on the SuperHighway, International Conference on Telemedicine and Telecare, "Telemedicine project RATEMA", B. Pieper, London, November, 8.-9.
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