Dissertations / Theses on the topic 'Polymeren'
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Gestring, Ingo. "Entgasen von Polymeren." [S.l. : s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=968042368.
Full textSchmatulla, Alexander. "Untersuchungen von polymeren Netzwerken mit Methoden der Rasterkraftmikroskopie." [S.l. : s.n.], 2008. http://nbn-resolving.de/urn:nbn:de:bsz:289-vts-65410.
Full textBerezovska, Ganna [Verfasser], and Alexander [Akademischer Betreuer] Blumen. "Monte Carlo study of semiflexible polymers = Monte Carlo Studie von semiflexiblen Polymeren." Freiburg : Universität, 2011. http://d-nb.info/1125885467/34.
Full textDolgushev, Maxim [Verfasser], and Alexander [Akademischer Betreuer] Blumen. "Theoretical investigations of semiflexible branched polymers = Theoretische Untersuchungen von semiflexiblen verzweigten Polymeren." Freiburg : Universität, 2011. http://d-nb.info/1125885459/34.
Full textWack, Holger. "Zum Quellungsdruck von polymeren Hydrogelen." [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=985376856.
Full textGriebel, Thomas. ""Molecular Imprinting" in hochverzweigten Polymeren." [S.l.] : [s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=962014370.
Full textRudolf, Arnd-Peter. "Hydrierende Spaltung von vernetzten Polymeren." Phd thesis, [S.l. : s.n.], 2000. http://elib.tu-darmstadt.de/diss/000074/Doktor.pdf.
Full textReiche, Annette. "Der Ladungstransport in polymeren Gelelektrolyten." [S.l. : s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=962322040.
Full textFischer, Thomas. "Lichtinduzierte Orientierungsprozesse in Azobenzen-Polymeren." Phd thesis, Universität Potsdam, 2005. http://opus.kobv.de/ubp/volltexte/2006/713/.
Full textIn isotropen Schichten flüssigkristalliner und amorpher Azobenzen-Polymeren wird das Ausmaß der induzierten optischen Anisotropie günstig durch eine Donor/Akzeptor-Substitution in 4,4'-Position beeinflusst. Die Induktionsgeschwindigkeit ist in Schichten flüssigkristalliner Polymeren deutlich geringer, jedoch lassen sich höhere Werte der Doppelbrechung und des Dichroismus erreichen. In Copolymeren bewirkt die Photoorientierung der Azobenzen-Seitengruppen eine kooperative Orientierung von formanisotropen Seitengruppen. Die Mesogenität der nicht-photochromen Seitengruppen erhöht das Ausmaß der induzierten optischen Anisotropie. Die Stabilität der induzierten Doppelbrechung und des Dichroismus wird durch diese Gruppen gesteigert.
In Schichten flüssigkristalliner Polymeren wird die induzierte optische Anisotropie beim Tempern im Bereich der Mesophasen erheblich verstärkt. Dabei reicht ein geringes Maß an induzierter Anisotropie aus, um Doppelbrechungs- und Dichroismuswerte zu erzielen, wie sie für LC-Domänen typisch sind.
In orientierten Schichten von Azobenzen-Polymeren wird das Resultat der linear polarisierten Bestrahlung durch die Stärke der anisotropen Wechselwirkungen in den flüssigkristallinen Domänen oder den LB-Multilayern bestimmt. Eine lichtinduzierte Reorientierung kann nur erreicht werden, wenn diese Wechselwirkungen überwunden werden können. Erfolgt eine Photoreorientierung in den orientierten Polymerschichten, werden in Copolymeren formanisotrope Seitengruppen ebenfalls kooperativ reorientiert. Eine vorgelagerte UV-Bestrahlung kann durch Erzeugung eines hohen Anteils an nicht-mesogenen Z-Isomeren die anisotropen Wechselwirkungen stark schwächen und so die Seitengruppen entkoppeln. Aus diesem Zustand erfolgt die Photoreorientierung mit einer der Photoorientierung in isotropen Schichten vergleichbaren Effizienz.
Die erarbeiteten Struktur-Eigenschafts-Beziehungen liefern einen Beitrag zur Optimierung derartiger Materialien für Anwendungen in den Bereichen optischer Funktionsschichten, holographischer Datenspeicherung oder der Generierung von Oberflächenreliefgittern.
The modification of optical characteristics by irradiation represents a basis for the creation of anisotropic optical components. In thin films of azobenzene polymers optical anisotropy can be induced or modified by linearly polarized irradiation. The goal of the work was it to compile substantial structure property relations of the photoorientation process in order to support an optimization of the materials for different applications.
In isotropic films of liquid crystalline and amorphous azobenzene polymers the extent of the induced optical anisotropy is increased by a donor/acceptor substitution in 4,4'-position. The induction speed is clearly smaller in films of liquid crystalline polymers, however higher values of birefringence and dichroism can be reached. In copolymers the photoorientation of the azobenzene side groups causes a cooperative orientation of form-anisotropic side groups. The mesogenity of the non-photochromic side groups increases the extent of the induced optical anisotropy.
The stability of the induced birefringence and dichroism is increased by these groups considerably. In films of liquid crystalline polymers the induced optical anisotropy is substantially amplified on annealing within the range of the mesophases. In this way, a small ratio of induced anisotropy is sufficient, in order to obtain birefringence and dichroism values as typical for LC domains.
In oriented films of azobenzene polymers the result of the linear polarized irradiation is determined by the strength of the anisotropic interactions in the liquid crystalline domains or the LB multilayers. A light-induced reorientation can be only achieved, if these interactions can be overcome. If a photoreorientation takes place in the oriented layers of copolymers, form-anisotropic side groups are cooperatively reoriented. An initial UV irradiation can strongly weaken the anisotropic interactions by generating of a high fraction of non-mesogenic z-isomers and decouples in this way the side groups. From this state the photoreorientation proceeds with an efficiency one comparable to the photoorientation in isotropic films.
The compiled structure property relations supplies a contribution for the optimization of such materials for applications in the fields of optical function films, holographic data storage or the generation of surface relief gratings.
Wack, Holger. "Zum Quellungsdruck von polymeren Hydrogelen." Stuttgart Fraunhofer-IRB-Verl, 2007. http://deposit.d-nb.de/cgi-bin/dokserv?id=2938740&prov=M&dok_var=1&dok_ext=htm.
Full textKretschmann, Oliver. "Assoziative Hydrogele und thermosensitive Polymer-Einschlussverbindungen auf Basis von adamantylhaltigen Polymeren und Cyclodextrinen." [S.l.] : [s.n.], 2007. http://deposit.ddb.de/cgi-bin/dokserv?idn=983203989.
Full textHäckel, Michael. "Holographische Datenspeicherung in nanostrukturierten azobenzolhaltigen Polymeren." [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=981238262.
Full textWolkenhauer, Markus. "Durchdringungs- und Adsorptionsverhalten von Stern-Polymeren." [S.l.] : [s.n.], 2002. http://archimed.uni-mainz.de/pub/2002/0137/diss.pdf.
Full textSchmitz, Heiko. "Computersimulation von Positronium-Annihilation in Polymeren." [S.l. : s.n.], 1999. http://ArchiMeD.uni-mainz.de/pub/2000/0012/diss.pdf.
Full textBedekar, Aravind. "Verbund von polymeren Zahnwurzelimplantaten mit Knochen /." Berlin : TU, Univ.-Bibliothek, Abt. Publ, 2001. http://www.ub.tu-berlin.de/index.php?id=1089#c4055.
Full textMüller, Jürgen Gerhard. "Exzitonentransfer und Dissoziationsdynamik in konjugierten Polymeren." Diss., lmu, 2003. http://nbn-resolving.de/urn:nbn:de:bvb:19-26403.
Full textKothe, Michael. "Alterungsverhalten von polymeren Zwischenschichtmaterialien im Bauwesen." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-132478.
Full textLaminated glass and laminated safety glass are used in a wide range of applications, for example in construction, automotive and photovoltaic industry. High demands on security properties are made, especially to laminated safety glass. These properties, such as binding glass fragments in case of breakage and the residual bearing capacity, will be realized by a composite of at least two panes of glass with a polymeric interlayer material. Currently, in about 95% of all cases, interlayer of polyvinyl butyral are used for the production of laminated safety glass, because this is the only material, which is approved by the building authorities. Various other polymeric materials such as ethylene vinyl acetate, ionomers and thermoplastic polyurethanes can also be used as interlayers. Based on their properties, these materials are suitable for special applications. Subject of this thesis is the study of various polymeric interlayer materials in reference to their suitability for the production of laminated glass and laminated safety glass, especially in comparison to the polyvinyl butyral interlayer. Especially the ageing behaviour of the interlayer is investigated to estimate their suitability over the lifetime of several decades, which is expected for building structures. To evaluate the ageing behaviour, the material properties of the different polymeric interlayer materials are first determined on the pure, unaged material or unaged laminates. Different ageing scenarios are carried out to assess the longterm stability, such as a temperature storage test, a climatic stress test as well as test under aggressive media and high irradiation. These ageing tests with small-scale test specimens will affect both the appearance of the laminated glass, as well as the material properties. In addition to the formation of bubbles, delamination or haze, these tests lead to changes in stiffness and degradation behaviour of the polymeric interlayer materials by chemical reactions or physical rearrangements. Based on the results of the ageing tests in this thesis, the investigated ionomer (DuPont SentryGlas) and a thermoplastic polyurethane (Huntsman Krystalflex PE399) are best suited for a long-term use as interlayer material for laminated glass or laminated safety glass. By changing the structural design or limiting the range of applications, the other investigated materials can also show their advantages for different applications
Dürr, Oliver. "Monte-Carlo-Simulationen zu polymeren Ionenleitern." [S.l. : s.n.], 1998. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB7278696.
Full textRuhe, Annette. "Immobilisierung von Vitamin B₁₂ in Polymeren /." [S.l : s.n.], 1987. http://www.ub.unibe.ch/content/bibliotheken_sammlungen/sondersammlungen/dissen_bestellformular/index_ger.html.
Full textMaclaren, Jana K. [Verfasser], and Christoph [Akademischer Betreuer] Janiak. "Synthesis and charactarization of chiral coordination polymers = Synthese und Charakterisierung von chiralen koordinations Polymeren." Freiburg : Universität, 2012. http://d-nb.info/1123468699/34.
Full textFornefeld, Torsten [Verfasser]. "Charakterisierung maßgeschneiderter makromolekularer Systeme: Analyse von photoschaltbaren Polymeren und Untersuchung der Wärmeleitfähigkeit von Polymeren und Polymernanokompositen / Torsten Fornefeld." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2021. http://d-nb.info/1232492914/34.
Full textFüchtjohann, Nils. "Immobilisierung von Proteinen in elektrogesponnenen polymeren Nanofasern." [S.l.] : [s.n.], 2006. http://archiv.ub.uni-marburg.de/diss/z2006/0080.
Full textZiegler, Jochen. "Schichtpräparation und Charakterisierung von Wellenleitern aus Polymeren." [S.l. : s.n.], 2000. http://ArchiMeD.uni-mainz.de/pub/2000/0016/diss.pdf.
Full textKulikovsky, Lazar. "Experimentelle Untersuchung der Ladungsträgerdynamik in photorefraktiven Polymeren." [S.l. : s.n.], 2003. http://pub.ub.uni-potsdam.de/2004/0020/kulikov.pdf.
Full textKulikovsky, Lazar. "Experimentelle Untersuchung der Ladungsträgerdynamik in photorefraktiven Polymeren." Phd thesis, Universität Potsdam, 2003. http://opus.kobv.de/ubp/volltexte/2005/130/.
Full textThe ongoing development of information processing requires new materials that are capable of effective light modulation, processing or storage. Photorefractive (PR) materials characterized by a reversible light-induced change of the refractive index have been effectively used for different optical applications. When a photorefractive medium is inhomogeneously irradiated, using for example an interference pattern, the generation, transport and trapping of the charge carriers results in the formation of a space charge field. The spatial modulation of the space charge field is transformed through the electro-optical effect into a modulation of the refractive index.
While photorefractive crystals are well known since the discovery of the PR effect in 1966, the photorefractive effect in polymers has only recently been demonstrated. The flexibility of material composition and thus its parameters along with easy processability of polymer materials essentially extends the range of possible applications of photorefractive materials. The response time of PR polymers is defined by the charge carrier dynamics including generation, transport, trapping etc. But a relation between the charge carriers dynamics and the response time of PR effect has not yet been proven experimentally. In this work a method for the experimental determination of all photo-physical parameters defining the formation of the space charge field in organic photorefractive materials has been proposed for the first time. It is based on the analysis of the photocurrent measured under different irradiation conditions such as continuous and pulse irradiation with different intensities, the variation of the pulse length, the number of pulses or the delay between pulses. Thus, the irradiation with single short pulses allowed to determine the mobility of free charge carriers as well as the characteristic parameters of shallow traps. In order to determine the density of deep traps, the intensity dependence of the steady-state photocurrent was investigated. The determining system of equations was analytically solved and it has been shown that the sublinear dependence of the photocurrent on intensity is primary correlated with the ratio of detrapping and trapping coefficients for deep traps. The detrapping coefficient of deep traps was independently determined from double-pulse experiments in which the delay between two pulses was varied. The dynamics of the space charge field formation has been numerically simulated, using the obtained photophysical parameters, and proven to coincide well with the experimentally determined dynamics of the PR effect. This allowed to relate the parameters of the individual processes participating in the formation of the space charge field to the dynamics of the PR effect in the investigated polymers. These results show that neither photogeneration nor transport of the charge carriers do limit the formation of the space charge field. It is demonstrated that in the investigated PR materials the dynamics of the space charge field is limited by the filling of deep traps with the photogenerated charge carriers.
Pfeifer, Sebastian. "Neue Ansätze zur Monomersequenzkontrolle in synthetischen Polymeren." Phd thesis, Universität Potsdam, 2011. http://opus.kobv.de/ubp/volltexte/2011/5138/.
Full textPolymer scientists are impressed by polymers created by nature. This is caused by their structure which is aimed to fulfill very special functions. The structure is primary built by sequential covalent linking of building units. Secondly, supramolecular aggregation leads to three-dimensional alignment. The sequence of the building blocks has a high influence on the higher molecular arrangement. Proteins are only one example for supramolecular structures which have special functions because of their supramolecular arrangement. This structure-property relationship is also possible for synthetic polymers. For this reason the control of monomer sequences in synthtic polymers is just as important for the resulting structure of a synthetic polymer molecule. Even though the synthesis of polymers with complex strucures and sizes as in nature is impossible in near future. But the development of new and better techniques for sequence control in synthetic polymers is of high importance to create well defined macromolecular structures which are tailor-made for their function. In contrast to a lot of advanced synthethis strategies for the design of complex polymer architechtures (e.g. brushes, stars, or dendrimers) their are less approaches for a monomer sequence control in synthetic polymers. This work presents two different techniques for controlling the monomer sequence inside a polymer. Especially in technologically significant radical polymerization it is difficult to control the monomer sequence because radical species are very reactive and the addition of a monomer to the radical function is not selective. The first approach makes use of the properties of two monomers (styrene and N-substituted maleimides) to add chemical funtions locally inside a polystyrene chain. By addition of N-functionalized maleimides during the polymerization of styrene chemical functions could be added at any desired position inside the polystyrene chain. This technique was tested on 20 different N-substituted maleimides. Most of them were incorporated successfully into the polymer chain. The second monomer sequence control approach is a stepwise synthesis of an oligomer made of short alternating hydrophobic and hydrophilic segments on a soluble polymer support. Two building blocks were used: ω-alkyne carboxylic acid (A-B) and α-amine-ω-azide oligoethylene glycol (C-D). The linking of the segments was done by applying two very efficient chemical reactions, namely 1,3-dipolar cycloaddition of terminal alkynes (A) and azides (D) and amidification of carboxylic acids (B) with primary amines (C). These two reactions proceed chemoselectively in an ABCD multifunctional mixture without a protection chemistry strategy. The polystyrene support was synthesized by atom transfer radical polymerization (ATRP) in the presence of an azido-functionalized ATRP initiator containing a labile p-alkoxybenzyl ester linker. Depending on the choise of solvent, the soluble polymer support was used in solution during the coupling reactions or was precipitated for an easy removal of excessive reagents and by-products. The acid-labile linker could be cleaved by trifluoroacetic acid treatment to obtain a hydrophilic/hydrophobic block copolymer.
Henzi, Patric. "UV-induzierte Herstellung monomodiger Wellenleiter in Polymeren." Karlsruhe FZKA, 2004. http://bibliothek.fzk.de/zb/berichte/FZKA6978.pdf.
Full textBoye, Susanne. "Moderne Fraktioniermethoden zur Charakterisierung von verzweigten Polymeren." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-107514.
Full textEdelmann, Jan, Mirko Albrecht, and Michael Gehde. "Graphen – Möglichkeiten und Grenzen in polymeren Kompositen." Technische Universität Chemnitz, 2017. https://monarch.qucosa.de/id/qucosa%3A21537.
Full textKäbisch, Sven. "Hybridsolarzellen aus ZnO-Nanostrukturen und konjugierten Polymeren." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät, 2015. http://dx.doi.org/10.18452/17240.
Full textHybrid solar cells are built from ZnO layers and ZnO nanostructures and Poly[2,6-(4,4-bis-(2-ethylhexyl)-4H-cyclopenta[2,1-b;3,4-b'']dithiophene)-alt-4,7(2,1,3-benzothiadiazole)] (PCPDTBT). The growth of the ZnO layers and nanostructures is performed with pulsed laser deposition (PLD) on sapphire substrates. The samples exhibit a c-axis orientation. The polarity of a ZnO layer determines the morphology of subsequently grown ZnO nanostructures. One can control the morphology between ZnO nanorods on an O-terminated layer and nanowalls on a Zn-terminated layer. Studies with convergent electron beam diffraction reveals that the ZnO nanostructures are always Zn-terminated. The interface between ZnO and PCPDTBT is studied with photoelectron spectroscopy and shows a vacuum level alignment between both materials. In principle, the interface is suitable for photovoltaic activity, however, the achieved power conversion efficiencies are very low. This is due to a low exciton dissociation efficiency, which can be improved by the use of sol-gel ZnO, small organic molecules, and a lower conductivity of the PLD ZnO. Nevertheless, the maximum power conversion efficiency amounts to 0.21 %, only.
Kamp, Koenraad Wolter Henrikus Jacob van der. "The interactions of blood with polymeric materials design of novel in vitro tests and in vivo evaluation of heparinized polymeric materials /." Groningen : Rijksuniversiteit Groningen, 1995. http://catalog.hathitrust.org/api/volumes/oclc/38114398.html.
Full textHuang, Quan. "Lösemittelfreie Herstellung von porösen polymeren Membranen durch Schaumextrusion." [S.l. : s.n.], 2000. http://deposit.ddb.de/cgi-bin/dokserv?idn=960451633.
Full textPeytcheva, Anna. "Kolloidales Calciumphosphat mit polymeren Additiven Struktur und Dynamik /." Phd thesis, [S.l. : s.n.], 2000. http://deposit.ddb.de/cgi-bin/dokserv?idn=961883499.
Full textAdla, Adnan. "TEM-Charakterisierung von Spuren energiereicher Ionen in Polymeren." Phd thesis, [S.l. : s.n.], 2002. http://elib.tu-darmstadt.de/diss/000250.
Full textTarabek, Jan. "Elektropolymerisation, Spektroelektrochemie und Potentiometrie von funktionalisierten leitfähigen Polymeren." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2004. http://nbn-resolving.de/urn:nbn:de:swb:14-1103635385062-58674.
Full textAndrosch, René [Verfasser]. "Reversibles Schmelzen und Kristallisieren von Polymeren / René Androsch." Halle (Saale) : Universitäts- und Landesbibliothek Sachsen-Anhalt, Halle, Hochschulschriften, 2005. http://d-nb.info/97881892X/34.
Full textFreudensprung, Ines [Verfasser]. "Tandempolymerisationen an polymeren und anorganischen Trägermaterialien / Ines Freudensprung." Mainz : Universitätsbibliothek Mainz, 2017. http://d-nb.info/1123534012/34.
Full textSaatkamp, Thomas [Verfasser]. "Bruchverhalten von Polymeren bei kryogenen Temperaturen / Thomas Saatkamp." Karlsruhe : KIT-Bibliothek, 1991. http://d-nb.info/1155474171/34.
Full textSchmalfuß, Eva [Verfasser]. "Charakterisierung von polymeren Pigmenten in Rotwein / Eva Schmalfuß." München : Verlag Dr. Hut, 2017. http://d-nb.info/1137024410/34.
Full textSchütz, Simon [Verfasser]. "Optische Spezialfasern aus Polymeren und Fluoridglas / Simon Schütz." München : Verlag Dr. Hut, 2013. http://d-nb.info/1045989061/34.
Full textChristoph, Gerrit [Verfasser]. "Bruchprozesse von Polymeren bei tiefen Temperaturen / Gerrit Christoph." Karlsruhe : KIT-Bibliothek, 1996. http://d-nb.info/1117701166/34.
Full textVIX, ARMELLE. "Structure et demouillage de films minces de polymeres cristaux liquides / struktur und entnetzung ultradunner filme aus flussigkristallinen polymeren." Paris 6, 1998. http://www.theses.fr/1998PA066697.
Full textRahimi, Khosrow [Verfasser], and Günter [Akademischer Betreuer] Reiter. "Controlling the crystal growth and morphology of conjugated polymers = Kontrolle des Kristallisation und Morphologie von konjugierten Polymeren." Freiburg : Universität, 2013. http://d-nb.info/112347530X/34.
Full textKurzhals, Steffen [Verfasser], Wolfgang H. [Akademischer Betreuer] Binder, and Franz [Akademischer Betreuer] Stelzer. "Crossover Chemistry on ROMP-Polymers : Überkreuzungsreaktionen an ROMP-Polymeren / Steffen Kurzhals. Betreuer: Wolfgang H. Binder ; Franz Stelzer." Halle, Saale : Universitäts- und Landesbibliothek Sachsen-Anhalt, 2013. http://d-nb.info/1037725417/34.
Full textStaudt, Byron Helmut. "Funktionelle Polymere mittels kontrollierter Polymerisationstechniken: Von der Massenspektrometrie endfunktionalisierter Polymere und den mechanischen Eigenschaften photovernetzbarer Blockcopolymere." Doctoral thesis, Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2019. http://hdl.handle.net/11858/00-1735-0000-002E-E585-F.
Full textHossain, Mokarram [Verfasser]. "Modelling and computation of polymer curing = Modellierung und Simulation der Aushärtung von Polymeren / vorgelegt von Mokarram Hossain." Erlangen : [Univ. Erlangen-Nürnberg, Lehrstuhl für Techn. Mechanik], 2010. http://d-nb.info/1013120612/34.
Full textKukula, Hildegard. "Lineare und verzweigte Blockcopolymere aus Polypeptiden und synthetischen Polymeren." Phd thesis, [S.l.] : [s.n.], 2001. http://pub.ub.uni-potsdam.de/2001/0014/kukula.pdf.
Full textGerstung, Vanessa. "Analytik von komplexen Polymeren mittels der Feld-Fluss-Fraktionierung." [S.l. : s.n.], 2002. http://www.diss.fu-berlin.de/2002/117/index.html.
Full textMichalke, Wolfgang. "Computersimulationen zu energetischen und topologischen Effekten bei polymeren Netzwerken." [S.l. : s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=965107078.
Full textTrinkle, Stefan. "Einfluss der Topologie auf die rheologischen Eigenschaften von Polymeren." [S.l. : s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=963865420.
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