Fakultät für Mathematik und Physik

 

Neueste Zugänge

  • Krivonos, Sergey; Lechtenfeld, Olaf; Sorin, Alexander (Amsterdam : Elsevier B.V., 2017)
    We associate with each simple Lie algebra a system of second-order differential equations invariant under a non-compact real form of the corresponding Lie group. In the limit of a contraction to a Schrödinger algebra, these ...
  • Hinken, David; Schinke, Carsten; Herlufsen, Sandra; Schmidt, Arne; Bothe, Karsten; Brendel, Rolf (College Park, MD : American Institute of Physics, 2011)
    We report in detail on the luminescence imaging setup developed within the last years in our laboratory. In this setup, the luminescence emission of silicon solar cells or silicon wafers is analyzed quantitatively. Charge ...
  • Bothe, K.; Ramspeck, K.; Hinken, D.; Schinke, Carsten; Schmidt, J.; Herlufsen, S.; Brendel, R.; Bauer, J.; Wagner, J.-M.; Zakharov, N.; Breitenstein, O. (College Park, MD : American Institute of Physics, 2009)
    We study the emission of light from industrial multicrystalline silicon solar cells under forward and reverse biases. Camera-based luminescence imaging techniques and dark lock-in thermography are used to gain information ...
  • Peest, Christian; Schinke, Carsten; Brendel, Rolf; Schmidt, Jan; Bothe, Karsten (College Park, MD : American Institute of Physics, 2017)
    Spectrophotometers are operated in numerous fields of science and industry for a variety of applications. In order to provide confidence for the measured data, analyzing the associated uncertainty is valuable. However, the ...
  • Schinke, Carsten; Bothe, Karsten; Peest, Peter Christian; Schmidt, Jan; Brendel, Rolf (College Park, MD : American Institute of Physics, 2014)
    We present data of the coefficient of band-to-band absorption of crystalline silicon at 295 K in the wavelength range from 950 to 1350 nm and analyze its uncertainty. The data is obtained from measurements of reflectance ...
  • Johannsmeier, Sonja; Heeger, Patrick; Terakawa, Mitsuhiro; Kalies, Stefan; Heisterkamp, Alexander; Ripken, Tammo; Heinemann, Dag (Bellingham, WA : S P I E - International Society for Optical Engineering, 2017)
    Gold nanoparticle mediated laser stimulation of neuronal cells allows for cell activation on a single-cell level. It could therefore be considered an alternative to classical electric neurostimulation. The physiological ...
  • Kallweit, Nicole; Baumhoff, Peter; Krueger, Alexander; Tinne, Nadine; Heisterkamp, Alexander; Kral, Andrej; Maier, Hannes; Ripken, Tammo (Bellingham, WA : S P I E - International Society for Optical Engineering, 2016)
    Optical cochlea stimulation is under investigation as a potential alternative to conventional electric cochlea implants in treatment of sensorineural hearing loss. If direct optical stimulation of spiral ganglion neurons ...
  • Höhl, Martin; Meinhardt-Wollweber, Merve; Schmitt, Heike; Lenarz, Thomas; Morgner, Uwe (Bellingham, WA : S P I E - International Society for Optical Engineering, 2016)
    Resonant enhancement of Raman signals is a useful method to increase sensitivity in samples with low concentration such as biological tissue. The investigation of resonance profiles shows the optimal excitation wavelength ...
  • Tinne, N.; Nolte, L.; Antonopoulos, G.C.; Schulze, J.; Andrade, J.; Heisterkamp, A.; Meyer, H.; Warnecke, A.; Majdani, Omid; Ripken, T. (Bellingham, WA : S P I E - International Society for Optical Engineering, 2016)
    The presented study focuses on the application of scanning laser optical tomography (SLOT) for non-destructive visualization of anatomical structures inside the human cochlea ex vivo. SLOT is a laser-based highly efficient ...
  • Lang, Adam; Engelberg, Dirk; Smith, Nicholas T.; Trivedi, Divyesh; Horsfall, Owen; Banford, Anthony; Martin, Philip A.; Coffey, Paul; Bower, William R.; Walther, Clemens; Weiß, Martin; Bosco, Hauke; Jenkins, Alex; Law, Gareth T.W. (Amsterdam : Elsevier B.V., 2018)
    Laser Induced Breakdown Spectroscopy (LIBS) has the potential to allow direct, standoff measurement of contaminants on nuclear plant. Here, LIBS is evaluated as an analytical tool for measurement of Sr and Cs contamination ...
  • Cuntz, M.J. (Ljubljana : Society of Mathematicians, Physicists and Astronomers of Slovenia, 2018)
    We present a technique to produce arrangements of lines with nice properties. As an application, we construct (224) and (264) configurations of lines. Thus concerning the existence of geometric (n4) configurations, only ...
  • Bunk, S.; Ivanova, T.A.; Lechtenfeld, Olaf; Popov, Alexander D.; Sperling, M. (College Park, MD : American Physical Society, 2014)
    We investigate instantons on sine-cones over Sasaki-Einstein and 3-Sasakian manifolds. It is shown that these conical Einstein manifolds are Kähler with torsion (KT) manifolds admitting Hermitian connections with totally ...
  • Ivanova, T.A.; Lechtenfeld, Olaf; Popov, Alexander D.; Szabo, R.J. (College Park, MD : American Physical Society, 2013)
    We revisit the problem of constructing instantons on ADE orbifolds R4/Γ and point out some subtle relations with the complex structure on the orbifold. We consider generalized instanton equations on R4/Γ which are BPS ...
  • Lechtenfeld, Olaf; Popov, Alexander D. (Melville, NY : AIP Publishing, 2012)
    We consider the six-sphere S6 = G2/SU(3) and its twistor space 𝒵=G2/U(2) associated with the SU(3)-structure on S6. It is shown that a Hermitian Yang-Mills connection (instanton) on a smooth vector bundle over S6 is ...
  • Popov, Alexander D. (College Park, MD : American Physical Society, 2015)
    We consider Yang-Mills theory with a matrix gauge group G on a direct product manifold M=Σ2×H2, where Σ2 is a two-dimensional Lorentzian manifold and H2 is a two-dimensional open disc with the boundary S1=∂H2. The ...
  • Lechtenfeld, Olaf; Popov, Alexander D. (Amsterdam : Elsevier, 2016)
    It was pointed out by Shifman and Yung that the critical superstring on X10=R4×Y6, where Y6 is the resolved conifold, appears as an effective theory for a U(2) Yang–Mills–Higgs system with four fundamental Higgs scalars ...
  • Lechtenfeld, Olaf; Popov, Alexander D. (Melville, NY : AIP Publishing, 2016)
    We consider Yang-Mills theory with N = 1 super-translation group in eleven auxiliary dimensions as the structure group. The gauge theory is defined on a direct product manifold Σ3 × S1, where Σ3 is a three-dimensional ...
  • Ivanova, T.A.; Lechtenfeld, Olaf; Popov, Alexander D. (College Park, MD : American Physical Society, 2017)
    We consider pure SU(2) Yang-Mills theory on four-dimensional de Sitter space dS4 and construct a smooth and spatially homogeneous magnetic solution to the Yang-Mills equations. Slicing dS4 as R×S3, via an SU(2)-equivariant ...
  • Larenz, R.W. (Berlin : De Gruyter, 1955)
    Im Anschluß an frühere Untersuchungen über mit Ladungstrennung verbundene Strömungen großer Amplitude im kompressiblen Plasma wird ein einfacher, auf dem Zusammenwirken von Plasmaströmungen beruhender Mechanismus für die ...
  • Larenz, R.W. (Berlin : De Gruyter, 1955)
    In einer konsequenten Theorie des kompressiblen Plasmas muß die Ladungstrennung berücksichtigt werden, besonders dann, wenn makroskopische Geschwindigkeiten auftreten, die mit der Schallgeschwindigkeit vergleichbar oder ...

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