@inproceedings{WitteStollenwerk2008, author = {Witte, Gerd and Stollenwerk, Manfred}, title = {Energy saving of cooling water pumps for power plants using adjustable propeller blades}, series = {International Rotating Equipment Conference 2008, D{\"u}sseldorf}, booktitle = {International Rotating Equipment Conference 2008, D{\"u}sseldorf}, year = {2008}, subject = {K{\"u}hlwasseranlage}, language = {en} } @inproceedings{Stollenwerk2005, author = {Stollenwerk, Manfred}, title = {DVD/R 16x high quality mass production - Vortrag auf der Conference Replication Expo, September 2005, Shanghai, China}, year = {2005}, abstract = {Vortrag auf der Conference Replication Expo September 2005, Shanghai, China}, subject = {DVD-R}, language = {en} } @article{MustorphStollenwerkBressau2006, author = {Mustorph, Heinz and Stollenwerk, Manfred and Bressau, Volker}, title = {Current Developments in Optical Data Storage with Organic Dyes}, series = {Angewandte Chemie}, volume = {45}, journal = {Angewandte Chemie}, number = {13}, pages = {2016 -- 2035}, year = {2006}, abstract = {The main motivation for the development of digital data storage has been the improvement in play-back quality and the increase in storage capacity. In 1982 Philips and Sony introduced the first technically and economically successful system based on this—the compact disc (CD) and a compatible player. A very broad diversity of optical data recording formats are available today, and a difference is drawn between prerecorded, recordable, and rewritable media. This Review gives an overview of the systems used, the main features of production, and then concentrates on the properties of the organic dyes that are used in recordable systems. Dyestuffs chemistry has gained the reputation of having become a mature field of activity. Is this prejudice or a justified swan song for dyestuffs chemistry? When applications in optical data storage are considered, it is evident that even today progresses such as CD-R and DVD/R would not be feasible without functional dyes.}, subject = {Optischer Speicher}, language = {en} } @article{DoehringPribullaKomziketal.2019, author = {D{\"o}hring, Thorsten and Pribulla, Theodor and Komzik, Richard and Mann, Michael and Sivanic, Peter and Stollenwerk, Manfred}, title = {Slovak-Bavarian collaboration on the development of telescope instrumentation}, series = {Contributions of the Astronomical Observatory Skalnate Pleso}, volume = {2019}, journal = {Contributions of the Astronomical Observatory Skalnate Pleso}, number = {49 / 2}, pages = {154 -- 158}, year = {2019}, abstract = {Within the project SLOBATCO (Slovak-Bavarian Telescope Collaboration) the Astronomical Institute of the Slovak Academy of Sciences and Aschaffenburg University of Applied Sciences collaborate in the development and commissioning of scientific instrumentation for the new {\O}1.3 m astronomical telescope at the Skalnat{\´e} Pleso observatory. The joint project is funded by the Bavarian Academic Center for Central, Eastern and Southeastern Europe (BAYHOST). Planned technical work packages are targeting the filter wheel software for the VIS camera, additional IR filters, and an upgrade of the mirror coating facility by additional sputtering equipment.}, subject = {Spiegelteleskop}, language = {en} } @misc{MannDoehringPribullaetal.2019, author = {Mann, Michael and D{\"o}hring, Thorsten and Pribulla, Theodor and Komzik, Richard and Sivanic, Peter and Stollenwerk, Manfred}, title = {Power quality evaluation for observatories}, editor = {Skopal, Augustin}, organization = {TH Aschaffenburg}, pages = {1}, year = {2019}, abstract = {Within the project SLOBATCO the question did arise, to what extend observatories have to rely on adequate power quality, e.g. the perfect sinusoidal shape of supply voltage and current, in order to ensure safe operation and accurate measurement results. International power quality standards are put in perspective with requirement specifications. Telescope operators indicate partial or total loss of function of measurement instruments. Measurements conducted during SLOBATCO project substantiate the need for power quality measurement campaigns.}, subject = {Sternwarte}, language = {en} } @inproceedings{Stollenwerk2006, author = {Stollenwerk, Manfred}, title = {The Energy Market within the next 20 years}, series = {6 MEAI, Wien}, booktitle = {6 MEAI, Wien}, year = {2006}, subject = {Energiemarkt}, language = {en} } @article{StollenwerkGattinger2005, author = {Stollenwerk, Manfred and Gattinger, P.}, title = {Process challenges of high Speed DVD/R manufacturing}, series = {One to One magazine}, volume = {2005}, journal = {One to One magazine}, number = {March}, pages = {55 -- 58}, year = {2005}, subject = {DVD-R}, language = {en} } @inproceedings{Stollenwerk2005, author = {Stollenwerk, Manfred}, title = {Efficient DVD/R Production}, series = {Optical Disc Seminar Asia ODSA, Teipei}, booktitle = {Optical Disc Seminar Asia ODSA, Teipei}, year = {2005}, subject = {DVD-R}, language = {en} } @misc{Stollenwerk2005, author = {Stollenwerk, Manfred}, title = {Die optische Datenspeicherung auf CD und DVD}, series = {{\"U}bersichtsvortrag auf der Fachtagung „Die Kunststoffoberfl{\"a}che" des S{\"u}ddeutschen Kunststoffzentrums W{\"u}rzburg}, journal = {{\"U}bersichtsvortrag auf der Fachtagung „Die Kunststoffoberfl{\"a}che" des S{\"u}ddeutschen Kunststoffzentrums W{\"u}rzburg}, year = {2005}, abstract = {Vortrag}, subject = {Optischer Speicher}, language = {de} } @misc{Stollenwerk2003, author = {Stollenwerk, Manfred}, title = {Basics of Recordable Media Production}, series = {Vortrag auf dem "International Recordable Media Technology Seminar", Dubai}, journal = {Vortrag auf dem "International Recordable Media Technology Seminar", Dubai}, year = {2003}, abstract = {Vortrag}, subject = {CD-R}, language = {en} } @misc{Stollenwerk2003, author = {Stollenwerk, Manfred}, title = {Correlation of DVD-Recordable Disc Performance and Process Parameters}, series = {Vortrag auf der „Replication EXPO 2003", Shanghai, China}, journal = {Vortrag auf der „Replication EXPO 2003", Shanghai, China}, year = {2003}, abstract = {Vortrag}, subject = {DVD-R}, language = {en} } @misc{Stollenwerk1998, author = {Stollenwerk, Manfred}, title = {CD-Recordable CD-Rewriteable}, series = {Vortrag auf der REPLItech Summit (Conference) S{\~a}o Paulo, Brazil}, journal = {Vortrag auf der REPLItech Summit (Conference) S{\~a}o Paulo, Brazil}, year = {1998}, abstract = {Vortrag}, subject = {CD-R}, language = {en} } @article{StollenwerkAlexanderShortetal.1996, author = {Stollenwerk, Manfred and Alexander, Morgan and Short, Robert and Jones, Frank and Zabold, Jochen and Michaeli, Walter}, title = {An X-ray photoelectron spectroscopic investigation into the chemical structure of deposits formed from hexamethyldisiloxane/ oxygen plasmas}, series = {Journal of Materials Science}, volume = {31}, journal = {Journal of Materials Science}, number = {7}, pages = {1879 -- 1885}, year = {1996}, abstract = {The effect of oxygen addition to microwave-sustained plasmas of hexamethyldisiloxane (HMDSO) has been investigated. Attention was directed to the solid products formed on aluminium substrates (plasma deposits). To enable a quantitative analysis of these, X-ray photoelectron spectroscopy (XPS) of standard silicon-containing materials was carried out. When suitable charge correction is applied to the XP spectra of HMDSO/O2 plasma deposits, a number of very clear trends emerge. From changes in elemental composition, core line binding energies (Si2p, C 1s, and O 1s) and widths, we show how oxygen addition to the plasma affects the chemical nature of the plasma deposit. The data reported also provide (some limited) information on the reactions taking place in the plasma.}, subject = {Photoelektronenspektroskopie}, language = {en} } @article{AlexanderShortJonesetal.1995, author = {Alexander, Morgan and Short, Robert and Jones, Frank and Stollenwerk, Manfred and Mathar, Gerd and Zabold, Jochen and Michaeli, Walter}, title = {The heterogeneous nature of deposits from hexamethyldisiloxane/oxygen plasmas}, series = {Ceramic films and coatings}, volume = {1995}, journal = {Ceramic films and coatings}, number = {54}, pages = {87 -- 99}, year = {1995}, subject = {Hexamethyldisiloxan}, language = {en} } @book{WoltersStollenwerkBerthold1994, author = {Wolters, Leo and Stollenwerk, Manfred and Berthold, J.}, title = {Die Plasmatechnologie und ihre Einsatzm{\"o}glichkeiten}, address = {Aachen}, year = {1994}, subject = {Plasmatechnik}, language = {de} } @misc{MichaeliStollenwerkZell1994, author = {Michaeli, Walter and Stollenwerk, Manfred and Zell, Harald}, title = {Variation der Oberfl{\"a}chenspannung bei fl{\"a}chigen Substraten und Verst{\"a}rkungsfasern sowie der Einfluß auf die Faser/Matrix-Haftung bei faserverst{\"a}rkten Kunststoffen}, year = {1994}, subject = {Faserverst{\"a}rkter Kunststoff}, language = {de} } @inproceedings{MichaeliStollenwerkSteinkampetal.1994, author = {Michaeli, Walter and Stollenwerk, Manfred and Steinkamp, F. and Zell, Harald}, title = {Plasmabehandlung von Glasfasern f{\"u}r faserverst{\"a}rkte Kunststoffe}, series = {6. Bundesdeutsche Fachtagung Plasmatechnologie, Wuppertal}, booktitle = {6. Bundesdeutsche Fachtagung Plasmatechnologie, Wuppertal}, year = {1994}, subject = {Faserverst{\"a}rkter Kunststoff}, language = {de} } @misc{StollenwerkZell1994, author = {Stollenwerk, Manfred and Zell, Harald}, title = {Veredeln von Kunststoffoberfl{\"a}chen mittels Mikrowellenplasmapolymerisation}, year = {1994}, subject = {Plasmapolymerisation}, language = {de} } @article{MichaeliTelgenbuescherStollenwerketal.1994, author = {Michaeli, Walter and Telgenb{\"u}scher, Klaus and Stollenwerk, Manfred and Mathar, Gerd and Zell, Harald}, title = {Plasmapolymerisierte Schichten: Neue Vielfalt der Funktionen}, series = {Schweizer Maschinenbau}, volume = {1994}, journal = {Schweizer Maschinenbau}, number = {41}, pages = {90 -- 93}, year = {1994}, subject = {Plasmapolymerisation}, language = {de} } @misc{Stollenwerk1993, author = {Stollenwerk, Manfred}, title = {Das Abscheiden von kratzfesten, hydrophilen und hydrophoben Schichten mittels Plasmapolymerisation}, year = {1993}, subject = {Plasmapolymerisation}, language = {de} } @article{LeiberMichaeliTelgenbuescheretal.1993, author = {Leiber, J{\"o}rn and Michaeli, Walter and Telgenb{\"u}scher, Klaus and Stollenwerk, Manfred}, title = {UV protecting layers on PVC made by plasma polymerization}, series = {Journal of Vinyl Technology}, volume = {15}, journal = {Journal of Vinyl Technology}, number = {2}, pages = {57 -- 61}, year = {1993}, subject = {Plasmapolymerisation}, language = {en} } @article{MichaeliStollenwerkTelgenbuescher1993, author = {Michaeli, Walter and Stollenwerk, Manfred and Telgenb{\"u}scher, Klaus}, title = {Plasmabehandlung - Ein umweltfreundliches Verfahren zur Oberfl{\"a}chenvorbehandlung und -reinigung}, series = {Scope-Journal Special}, volume = {1993}, journal = {Scope-Journal Special}, number = {16}, pages = {21 -- 23}, year = {1993}, subject = {Plasmatechnik}, language = {de} } @misc{ZellTelgenbuescherStollenwerk1993, author = {Zell, Harald and Telgenb{\"u}scher, Klaus and Stollenwerk, Manfred}, title = {Kratzfeste Beschichtungen von Kunststoffen mittels Plasmapolymerisation}, year = {1993}, subject = {Plasmapolymerisation}, language = {de} } @inproceedings{MichaeliLeiberTelgenbuescheretal.1993, author = {Michaeli, Walter and Leiber, J{\"o}rn and Telgenb{\"u}scher, Klaus and Stollenwerk, Manfred}, title = {Plasma polymerization in automotive industries - A possibility for the reduction of permeation in plastic fuel tanks}, series = {26th intern. Symposium on Automotive Technology and Automation, Aachen Tagungsband}, booktitle = {26th intern. Symposium on Automotive Technology and Automation, Aachen Tagungsband}, pages = {469 -- 476}, year = {1993}, subject = {Plasmapolymerisation}, language = {en} } @misc{Stollenwerk1993, author = {Stollenwerk, Manfred}, title = {Oberfl{\"a}chenmodifikation mittels Plasmatechnik}, year = {1993}, subject = {Plasmatechnik}, language = {de} } @article{MeyerHardtdegenGruetzmacheretal.1992, author = {Meyer, R. and Hardtdegen, Hilde and Gr{\"u}tzmacher, Detlev and Carius, R. and Stollenwerk, Manfred and Balk, Peter}, title = {Optical and structural properties of MOVPE grown GaxIn1-xAs/InP strained multiple quantum well structures}, series = {Journal of Electronic Materials}, volume = {21}, journal = {Journal of Electronic Materials}, number = {3}, pages = {293 -- 298}, year = {1992}, abstract = {This paper presents a study of the structural and optical properties of strained GaInAs/ InP multiple quantum well (MQW) structures fabricated by LP-MOVPE. The composition of the Ga x In1-x As films ranged fromx = 0.17 tox = 1.0 and was determined by sputtered neutral mass spectrometry (SNMS) on thick layers. The structures of the MQW samples with well widths from 1.5 to 5 nm were investigated by high resolution x-ray diffraction (HR-XRD). Simulations of the diffraction patterns showed that transition layers of approximately 2 monolayer (ML) thickness with high lattice mismatch exist at the interfaces. Photoluminescence (PL) measurements indicate well widths of a multiple of a monolayer with local variations of one monolayer. The PL peak energies vary smoothly with the Ga concentration. These results were confirmed by optical absorption measurements.}, subject = {Galliumarsenid}, language = {en} } @article{OschinowoForchelDreybrodtetal.1992, author = {Oschinowo, John and Forchel, Alfred and Dreybrodt, J{\"o}rg and Emmerling, Monika and Gyuro, Imre and Speier, Peter and Gr{\"u}tzmacher, Detlev and Stollenwerk, Manfred}, title = {Lateral thermal stability modulation for the definition of InGaAs/InP wires}, series = {Microelectronic Engineering}, volume = {17}, journal = {Microelectronic Engineering}, number = {1-4}, pages = {505 -- 508}, year = {1992}, abstract = {We have investigated a novel technique for the definition of semiconductor wires. By the selective local removal of the InP top barrier layer wire patterns in which the top material varies between InP and InGaAs are formed from an InGaAs/InP quantum well. In a subsequent annealing step the top InGaAs layer shows substantially stronger interdiffusion than the InP covered regions (wires). By using luminescence spectroscopy we show that this defectfree enhanced interdiffusion can be used to obtain a lateral energy barrier.}, subject = {Indiumarsenid}, language = {en} } @article{WolterSchwedlerGallmannetal.1991, author = {Wolter, Karl and Schwedler, Ralf and Gallmann, B. and Jaekel, Christian and Stollenwerk, Manfred and Camassel, Jean and Laurenti, Jean Pierre}, title = {Optical characterization of strained InGaAs/InP quantum well structures}, series = {Microelectronic Engineering}, volume = {15}, journal = {Microelectronic Engineering}, number = {1-4}, pages = {593 -- 596}, year = {1991}, abstract = {The effects of strain on the optical properties ofmultiple-quantum well structures grown by low pressure metal organic vapor phase epitaxy have been investigated by photoluminescence spectroscopy. The investigated composition range is varied between 0.17 ≤ xGa ≤ 1.00. Sputtered neutrals mass spectroscopy has been used to calibrate the growth interpolated nominal compositions. Distinct peaks from monolayer variations of well thickness are observed from all samples. The analysis of the PL-spectra leads to the assumption of an intermediate layer of InAs0.65P0.35 at the InP to In1-ϰGaχAs(lower) interface.}, subject = {Indiumarsenid}, language = {en} } @article{SchwedlerWolterGallmannetal.1991, author = {Schwedler, Ralf and Wolter, Karl and Gallmann, B. and Gr{\"u}tzmacher, Detlev and Stollenwerk, Manfred and Kurz, H.}, title = {Optical characterization of In-rich strained In1-xGaxAs/InP single- and multiple-quantum-wells}, series = {Materials Science and Engineering: B}, volume = {9}, journal = {Materials Science and Engineering: B}, number = {1-3}, pages = {297 -- 300}, year = {1991}, abstract = {We report on the photoluminescence spectroscopy of a large set of strained In1-xGaxAs/InP quantum well structures grown by low pressure metallo-organic vapour phase epitaxy. Distinct peaks from monolayer steps are observed in all samples. For the first time, data on indium-rich In1-xGaxAs/InP structures with complementary gallium contents as low as xGa = 0.07 and xGa = 0.11 are reported. The sample quality appears independent of the number of quantum wells stacked in the structure. With decreasing gallium content, a decrease in luminescence intensity is observed, which is related to an increase in the number of non-radiative recombination centres with respect to lattice-matched samples.}, subject = {Photolumineszenzspektroskopie}, language = {en} } @inproceedings{MahlzahnHeukenGruetzmacheretal.1991, author = {Mahlzahn, Erik and Heuken, Michael and Gr{\"u}tzmacher, Detlev and Stollenwerk, Manfred and Heime, Klaus}, title = {Advanced InGaAs/InP p-type sydomorphic MODFET}, series = {Proceedings of the SPIE}, volume = {1362}, booktitle = {Proceedings of the SPIE}, pages = {199 -- 204}, year = {1991}, subject = {Indiumarsenid}, language = {en} } @inproceedings{GladeHergethStollenwerketal.1990, author = {Glade, M. and Hergeth, J. and Stollenwerk, Manfred and Gr{\"u}tzmacher, Detlev and Balk, Peter}, title = {Effects of zinc diffusion during MOPVE on performance of InP/InGaAsP double heterostructure lasers}, series = {Proceedings of the 17th International Symposium of GaAs and related Compounds, Jersey, UK}, booktitle = {Proceedings of the 17th International Symposium of GaAs and related Compounds, Jersey, UK}, pages = {579 -- 584}, year = {1990}, subject = {Indiumphosphid}, language = {en} } @inproceedings{MahlzahnHeukenGruetzmacheretal.1990, author = {Mahlzahn, Erik and Heuken, Michael and Gr{\"u}tzmacher, Detlev and Stollenwerk, Manfred and Heime, Klaus}, title = {High mobility and high sheet density p-type pseudomorphic MODFET}, series = {Proceedings of the 17th International Symposium of GaAs and related Compounds, Jersey, UK}, booktitle = {Proceedings of the 17th International Symposium of GaAs and related Compounds, Jersey, UK}, pages = {579 -- 584}, year = {1990}, subject = {HEMT}, language = {en} } @article{AlexanderShortJonesetal.1996, author = {Alexander, Morgan and Short, Robert and Jones, Frank and Stollenwerk, Manfred and Mathar, Gerd and Zabold, Jochen and Michaeli, Walter}, title = {An XPS investigation into the chemical structure of deposits formed from hexamethyldisiloxane/oxgen plasmas}, series = {Journal of Materials Science}, volume = {31}, journal = {Journal of Materials Science}, pages = {1879 -- 1885}, year = {1996}, subject = {Hexamethyldisiloxan}, language = {en} } @article{MichaeliStollenwerkTelgenbuescheretal.1993, author = {Michaeli, Walter and Stollenwerk, Manfred and Telgenb{\"u}scher, Klaus and Leiber, J{\"o}rn}, title = {Vorbehandeln und Beschichten von Kunststoffteilen in PE-CVD-Anlagen}, series = {Maschinenmarkt}, volume = {99}, journal = {Maschinenmarkt}, number = {29}, pages = {42 -- 48}, year = {1993}, subject = {Kunststoffprodukt}, language = {de} } @article{MichaeliTelgenbuescherLeiberetal.1992, author = {Michaeli, Walter and Telgenb{\"u}scher, Klaus and Leiber, J{\"o}rn and Stollenwerk, Manfred}, title = {Plasmapolymerisation zur Veredelung von Kunststoffoberfl{\"a}chen}, series = {D{\"u}nne Schichten}, volume = {1992}, journal = {D{\"u}nne Schichten}, number = {3}, pages = {34 -- 38}, year = {1992}, subject = {Plasmapolymerisation}, language = {de} } @article{MichaeliLeiberTelgenbuescheretal.1992, author = {Michaeli, Walter and Leiber, J{\"o}rn and Telgenb{\"u}scher, Klaus and Stollenwerk, Manfred}, title = {Plasmapolymerisation: Kunststoffe beschichten}, series = {Industrieanzeiger}, volume = {1992}, journal = {Industrieanzeiger}, number = {43}, pages = {58 -- 60}, year = {1992}, subject = {Plasmapolymerisation}, language = {de} } @inproceedings{StollenwerkMichaeliTelgenbuescheretal.1992, author = {Stollenwerk, Manfred and Michaeli, Walter and Telgenb{\"u}scher, Klaus and Leiber, J{\"o}rn and Londschein, Martin}, title = {Verbesserung von Verbundwerkstoffen durch Plasmabehandlung der Verst{\"a}rkungsfasern}, year = {1992}, subject = {Faserverst{\"a}rkter Kunststoff}, language = {de} } @article{StollenwerkGruetzmacher1991, author = {Stollenwerk, Manfred and Gr{\"u}tzmacher, Detlev}, title = {GaInAs/GaInAsP SC-MQW-laser emitting at 1.35 µm grown by LP-MOVPE}, series = {Microelectronic Engineering}, volume = {1991}, journal = {Microelectronic Engineering}, number = {15}, pages = {263 -- 266}, year = {1991}, subject = {Quantenwell-Laser}, language = {en} } @inproceedings{StollenwerkGruetzmacherHeimeetal.1991, author = {Stollenwerk, Manfred and Gr{\"u}tzmacher, Detlev and Heime, Klaus and M{\"o}hrle, Martin and Fidorra, Frank}, title = {GaInAs/GaInAsP SC-MQW Laser mit einer Emissionswellenl{\"a}nge von 1,35 µm deponiert mit Hilfe der LP-MOVPE}, year = {1991}, subject = {Quantenwell-Laser}, language = {de} } @inproceedings{StollenwerkGruetzmacherSchwedleretal.1991, author = {Stollenwerk, Manfred and Gr{\"u}tzmacher, Detlev and Schwedler, Ralf and Meyer, R. and Hardtdegen, Hilde and Kux, A. and Heime, Klaus}, title = {Systematic study of strained GaInAs/InP grown by MOVPE}, year = {1991}, subject = {Galliumarsenid}, language = {en} } @article{OschinowoForchelGruetzmacheretal.1992, author = {Oschinowo, John and Forchel, Alfred and Gr{\"u}tzmacher, Detlev and Stollenwerk, Manfred and Heuken, Michael and Heime, Klaus}, title = {Photoluminescence study of interdiffusion in In0,53Ga0,47/As/InP surface quantum wells}, series = {Applied Physics Letters}, volume = {60}, journal = {Applied Physics Letters}, number = {21}, pages = {2660 -- 2662}, year = {1992}, abstract = {We have investigated the thermal stability and interdiffusion of In0.53Ga0.47As/InP surface quantum wells. In these structures the optically active InGaAs layer is bounded on one side by vacuum and on the other side by InP. We obtain well-defined photoluminescence emission spectra with high intensity. After rapid thermal annealing at temperatures between 500 and 900 °C (annealing time 1 min) we observe strong emission energy shifts of up to 316 meV. By using a simple model of ion intermixing we estimate large interdiffusion coefficients (e.g., 1.7×10-14 cm2 s-1 for T=900 °C) and an activation energy of 1.3 eV for the surface quantum wells.}, subject = {Photolumineszenz}, language = {en} } @inproceedings{OschinowoForchelGruetzmacheretal.1991, author = {Oschinowo, John and Forchel, Alfred and Gr{\"u}tzmacher, Detlev and Stollenwerk, Manfred}, title = {RTA study of thermal stability and interdiffusion of InGaAs/InP quantum wells - the influence of InGaAs cap layers}, series = {Third International Conference Indium Phosphide and Related Materials Cardiff/Wales}, booktitle = {Third International Conference Indium Phosphide and Related Materials Cardiff/Wales}, pages = {606 -- 609}, year = {1991}, abstract = {A study of the thermal stability of InGaAs/InP quantum wells with different top barrier compositions that used rapid thermal annealing at temperatures between 600 degrees C and 950 degrees C (annealing time 1 min) is discussed. The thermal interdiffusion effects were evaluated by photoluminescence spectroscopy. From the temperature dependence of the luminescence energy shifts the interdiffusion coefficients and activation energies are determined.}, subject = {Photolumineszenzspektroskopie}, language = {en} } @article{ShiGruetzmacherStollenwerketal.1992, author = {Shi, Chang-Xin and Gr{\"u}tzmacher, Detlev and Stollenwerk, Manfred and Wang, Qing-Kang and Heime, Klaus}, title = {High-performance undoped InP/n-InP/GaAs MSM photodetectors grown by LP-MOVPE}, series = {IEEE Transactions on Electron Devices}, volume = {39}, journal = {IEEE Transactions on Electron Devices}, number = {5}, publisher = {IEEE}, pages = {1028 -- 1031}, year = {1992}, subject = {Indiumarsenid}, language = {en} } @article{StollenwerkDoehringFreudenmannetal.2021, author = {Stollenwerk, Manfred and D{\"o}hring, Thorsten and Freudenmann, Dominic and Sch{\"a}fer, Tobias and Stadtm{\"u}ller, Johannes and R{\"o}cke, Nicole}, title = {Sputtered highly effective iridium catalysts: a new approach for green satellite propulsion}, series = {Journal of Materials Science}, volume = {2021}, journal = {Journal of Materials Science}, number = {2021}, doi = {https://doi.org/10.1007/s10853-021-05897-z}, pages = {1 -- 11}, year = {2021}, abstract = {This work demonstrated the large potential of sputtered iridium metal for catalytic reactions shown by the example of decomposition of hydrogen peroxide (H2O2) for space propulsion systems. For this purpose, iridium was coated onto Al2O3 pellets by a sputter process under varied process parameters. Depending on previously selected parameters, the obtained metal-loaded pellets offer closed- and/or open-shell structures. Catalytic productivity of these first-generation iridium-sputtered catalysts was estimated in laboratory experiments and compared to platinum-loaded pellets. Under optimized sputter-process conditions, the reactivity is significantly improved compared to the platinum-impregnated pellets. The better catalytic productivity can be explained by the increased active surface area of the iridium layers on the pellets. The surface morphology and the microstructure of the iridium coating can be actively controlled by the sputter pressure. The results are in accordance with the sputtering process pressure tendency described by the Thornton Structure-Zone Model.}, subject = {Iridium}, language = {en} } @misc{DoehringStollenwerkStadtmuelleretal.2021, author = {D{\"o}hring, Thorsten and Stollenwerk, Manfred and Stadtm{\"u}ller, Johannes and Freudenmann, Dominic and R{\"o}cke, Nicole}, title = {Nanostructured iridium catalysts for effective hydrogen peroxide decomposition}, series = {EuroNanoForum}, volume = {2021}, journal = {EuroNanoForum}, organization = {TH Aschaffenburg}, pages = {1}, year = {2021}, abstract = {The EU intends to restrict the use of critical fuels in space propulsion systems. These propellants like hydrazine are chemically aggressive, toxic and carcinogenic. Space propulsion of the future should be environmentally friendly, inexpensive, and easy to handle. Aschaffenburg University and DLR are currently developing environmentally friendly technologies for future satellite engines. Thereby rocket-grade hydrogen peroxide, which is foreseen as a substitute, is converted to uncritical water vapour and oxygen by an exothermic catalytic reaction on nanostructured iridium layers. The resulting hot gases provide the required amount of thrust. The iridium catalyst layers are coated onto ceramic pellets, using RF magnetron sputtering technology. The catalytic functionality was tested afterwards at the chemical laboratories of DLR. First experimental results show a significantly higher catalytic activity for nanostructured iridium surfaces than for smoother crystalline layers.}, subject = {Iridium}, language = {en} } @inproceedings{StanikDoehringPregleretal.2024, author = {Stanik, Eva and D{\"o}hring, Thorsten and Pregler, Jan and Stollenwerk, Manfred and Hildenbrand, Georg}, title = {Spectral measurements and life science experiments using extreme radiation exposures at high altitude}, series = {Proceedings of SPIE}, volume = {2024}, booktitle = {Proceedings of SPIE}, number = {13024}, doi = {10.1117/12.3028519}, pages = {130240M -- 130240M}, year = {2024}, abstract = {The ASTRABAX project ("Aschaffenburg Stratospheric Balloon Experiment"), being funded for the years 2024 to 2026, is designed as a multimodal platform for the investigation of radiation exposures at high altitude. The UV-C spectral region is of special interest. Spectral measurements observe this region of interest using miniature UV-VIS spectrometers. The platform also contains a radiation dosimetry, a power source for on-board electronics, and common shielding setups for multiple spectral combinations. Human cells are exposed simultaneously to radiation of different compositions as particle, X-ray and UV radiation. After the flight, possible changes in the spatial chromatin organization are examined. Material samples intended for the development of satellite components are irradiated also. Investigations under such conditions are realistic and crucial for high altitude flights in the atmosphere, for space flights as well as for comparable exposures on other objects of the solar system, and even for exoplanet habitats to some extent.}, subject = {Spektroskopie}, language = {en} } @misc{DoehringStanikPregleretal.2024, author = {D{\"o}hring, Thorsten and Stanik, Eva and Pregler, Jan and Stollenwerk, Manfred and Hildenbrand, Georg}, title = {Forschung zu Strahlensch{\"a}den mit dem Stratosph{\"a}renballon-Experiment ASTRABAX}, organization = {Technische Hochschule Aschaffenburg}, pages = {1 -- 1}, year = {2024}, abstract = {Das f{\"u}r die Jahre 2024 bis 2026 gef{\"o}rderte Projekt ASTRABAX („Aschaffenburger Stratosph{\"a}renballon- Experiment") ist als multimodale Plattform der Material- und Biowissenschaften f{\"u}r Untersuchungen bei extremen Strahlenbelastungen in großer H{\"o}he konzipiert. Dabei ist der UV-C-Spektralbereich von besonderem Interesse und wird mit Miniatur-UV-Spektrometern untersucht. Die Plattform des Ballonexperimentes umfasst eine gemeinsame Strahlungsdosimetrie, eine Stromquelle f{\"u}r die Bordelektronik und Abschirmungen f{\"u}r mehrere Bestrahlungskombinationen. Biologische Zellen werden Kombinationen aus Partikel-, R{\"o}ntgen- und UV-Strahlung ausgesetzt. Nach dem Flug werden m{\"o}gliche Ver{\"a}nderungen in der r{\"a}umlichen Chromatinorganisation mittels hochaufl{\"o}sender Mikroskopie untersucht. Auswirkungen von Kombinationen aus hoch- und niederenergetischer Strahlung sind bisher nicht ausreichend erforscht und beschrieben. Zus{\"a}tzlich werden auch f{\"u}r Satelliten relevante Materialproben bestrahlt. Untersuchungen unter solchen Bedingungen sind realistisch und relevant f{\"u}r Fl{\"u}ge in der Stratosph{\"a}re, f{\"u}r Raumfl{\"u}ge sowie f{\"u}r vergleichbare Expositionen bei anderen Objekten des Sonnensystems oder Exoplaneten-Habitaten.}, subject = {Stratosph{\"a}ren-Ballon}, language = {de} } @incollection{MannWenzlerDoehringetal.2022, author = {Mann, Michael and Wenzler, Sebastian and D{\"o}hring, Thorsten and Stollenwerk, Manfred and Pribulla, Theodor and Sivanič, Peter and Komž{\´i}k, Richard}, title = {Stromversorgung als Umweltfaktor: Analyse der elektrischen Netzqualit{\"a}t in astronomischen Observatorien}, series = {Umwelteinfl{\"u}sse erfassen, simulieren, bewerten}, volume = {2022}, booktitle = {Umwelteinfl{\"u}sse erfassen, simulieren, bewerten}, editor = {Karl Friedrich, Zieghahn}, publisher = {Gesellschaft f{\"u}r Umweltsimulation e.V.}, isbn = {978-3-9818507-7-2}, pages = {193 -- 207}, year = {2022}, subject = {Sternwarte}, language = {de} } @misc{StanikDoehringPregleretal.2024, author = {Stanik, Eva and D{\"o}hring, Thorsten and Pregler, Jan and Stollenwerk, Manfred and Hildenbrand, Georg}, title = {Spectral measurements and life science experiments using extreme radiation exposures at high altitude}, organization = {Technische Hochschule Aschaffenburg}, pages = {1}, year = {2024}, abstract = {The ASTRABAX project ("Aschaffenburg Stratospheric Balloon Experiment"), being funded for the years 2024 to 2026, is designed as a multimodal platform for the investigation of radiation exposures at high altitude. Miniature UV-VIS spectrometers observe the UV-C spectral region. The platform also contains a radiation dosimetry, a power source for on-board electronics, and common shielding setups for multiple spectral combinations. The effects of combinations of high- and low-energy rays on human cells haven´t been sufficiently investigated and described so far. Investigations under such conditions are realistic and crucial for high altitude flights in the atmosphere, for space flights as well as for comparable exposures on other objects of the solar system, and even for exoplanet habitats to some extent.}, subject = {Stahlenbelastung}, language = {en} } @inproceedings{MannDoehringStollenwerketal.2024, author = {Mann, Michael and D{\"o}hring, Thorsten and Stollenwerk, Manfred and Priebsch, Alessandro and Pribulla, Theodor and Komž{\´i}k, Richard M. and Sivanic, Peter}, title = {Advanced power quality measurement techniques at the electric power grid of astronomical observatories}, series = {Observatory Operations: Strategies, Processes, and Systems X, Conference of SPIE 13098, 17 - 20 June 2024}, booktitle = {Observatory Operations: Strategies, Processes, and Systems X, Conference of SPIE 13098, 17 - 20 June 2024}, editor = {Storrie-Lombardi, Lisa J. and Benn, Chris R. and Chrysostomou, Antonio}, publisher = {SPIE}, doi = {10.1117/12.3016562}, year = {2024}, subject = {Sternwarte}, language = {en} }