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Institutionelles Repositorium der Leibniz Universität Hannover
Institutional Repository
2925 Publications
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  • Digital mirror devices and liquid crystal displays in maskless lithography for fabrication of polymer-based holographic structures

    Rahlves, Maik; Kelb, Christian; Rezem, Maher; Schlangen, Sebastian; Boroz, Kristian; Gödeke, Dina; Ihme, Maximilian; Roth, Bernhard (2015)
    Polymer-based holographic and diffractive optical elements have gained increasing interest due to their potential to be used in a broad range of applications, such as illumination technology, micro-optics, and holography. We present a production process to fabricate polymer-based diffractive optical elements and holograms. The process is based on maskless lithography, which is used to fabricate optical elements in photoresist. We discuss several lab-level lithography setups based on digital m...

    Coupled coating formation simulation in thermal spray processes using CFD and FEM

    Prehm, J.; Xin, L.; Möhwald, Kai; Bach, Friedrich-Wilhelm (2011)
    This paper deals with the simulation of coating formation in Thermal Spray processes. That means that impingement and flattening of molten metal- or ceramic particles with a diameter of about 50 microns on a rough surface have to be regarded. In this work, this is accomplished use of the Volume of Fluid method. The disadvantage here is that only the pure flattening process can be considered. In order to implicate the shrinking of the particles due to cooling down after solidification, which i...

    Search for transient gravitational waves in coincidence with short-duration radio transients during 2007-2013

    Abbott, B.P.; Allen, Bruce; Aufmuth, P.; Bisht, A.; Danzmann, Karsten; Denker, T.; Heurs, M.; Kaufer, S.; Krueger, C.; Lough, J.D.; Lück, Harald; Sawadsky, A.; Schütte, D.; Steinmeyer, D.; Vahlbruch, H.;... (2016)
    We present an archival search for transient gravitational-wave bursts in coincidence with 27 single-pulse triggers from Green Bank Telescope pulsar surveys, using the LIGO, Virgo, and GEO interferometer network. We also discuss a check for gravitational-wave signals in coincidence with Parkes fast radio bursts using similar methods. Data analyzed in these searches were collected between 2007 and 2013. Possible sources of emission of both short-duration radio signals and transient gravitationa...

    Geometric dynamics of nonlinear circuits and jump effects

    Thiessen, Tina; Mathis, Wolfgang (2011)
    Purpose: This paper seeks to give an outline about the geometric concept of electronic circuits, where the jump behavior of nonlinear circuits is emphasized. Design/methodology/approach: A sketch of circuit theory in a differential geometric setting is given. Findings: It is shown that the structure of circuit theory can be given in a much better way than by means of a description of circuits using concrete coordinates. Furthermore, the formulation of a concrete jump condition is given. Origi...

    Noncommutative baby Skyrmions

    Ioannidou, Theodora; Lechtenfeld, Olaf (2010)
    A class of exact analytic noncommutative baby Skyrmions is obtained. The corresponding configurations have singular commutative limit but are stable against scaling due to the noncommutativity. We compute their energies, investigate their stability and determine the asymptotic two-Skyrmion interaction.
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