Browsing Τμήμα Φυσικής / Department of Physics by Title

Now showing items 291-310 of 1410

    • Article  

      A facility for pion-induced nuclear reaction studies with HADES 

      HADES Collaboration; Adamczewski-Musch, J.; Arnold, O.; Behnke, C.; Belounnas, Amel; Belyaev, A.; Berger-Chen, J. C.; Biernat, J.; Blanco, A.; Blume, C.; Böhmer, M.; Bordalo, P.; Chernenko, S.; Chlad, C.; Deveaux, C.; Dreyer, J.; Dybczak, A.; Epple, E.; Fabbietti, L.; Fateev, O.; Filip, P.; Fonte, P.; Franco, C.; Friese, J.; Fröhlich, I.; Galatyuk, T.; Garzón, J. A.; Gernhäuser, R.; Golubeva, M.; Guber, F.; Gumberidze, M.; Harabasz, S.; Heinz, T.; Hennino, T.; Hlavac, S.; Höhne, C.; Holzmann, R.; Ierusalimov, A.; Ivashkin, A.; Kämpfer, B.; Karavicheva, T.; Kardan, B.; Koenig, I.; Koenig, W.; Kolb, B. W.; Korcyl, G.; Kornakov, G.; Kotte, R.; Kugler, A.; Kunz, T.; Kurepin, A.; Kurilkin, A.; Kurilkin, P.; Ladygin, V.; Lalik, R.; Lapidus, K.; Lebedev, A.; Lopes, L.; Lorenz, M.; Mahmoud, T.; Maier, L.; Mangiarotti, A.; Markert, J.; Maurus, S.; Metag, V.; Michel, J.; Mihaylov, D. M.; Morozov, S.; Müntz, C.; Münzer, R.; Naumann, L.; Nowakowski, K. N.; Palka, M.; Pechenov, V.; Pechenova, O.; Petukhov, O.; Pietraszko, J.; Przygoda, W.; Ramos, S.; Ramstein, B.; Reshetin, A.; Rodriguez-Ramos, P.; Rosier, P.; Rost, A.; Sadovsky, A.; Salabura, P.; Scheib, T.; Schmidt, C. J.; Schmidt-Sommerfeld, K.; Schuldes, H.; Schwab, E.; Scordo, A.; Scozzi, F.; Seck, F.; Sellheim, P.; Siebenson, J.; Silva, L.; Sobolev, Y. G.; Spataro, S.; Ströbele, H.; Stroth, J.; Strzempek, P.; Sturm, C.; Svoboda, O.; Tlusty, P.; Traxler, M.; Tsertos, Haralambos; Usenko, E.; Wagner, V.; Wendisch, C.; Wiebusch, M. G.; Wirth, J.; Zanevsky, Y.; Zumbruch, P. (2017)
      The combination of a production target for secondary beams, an optimized ion optical beam line setting, in-beam detectors for minimum ionizing particles with high rate capability, and an efficient large acceptance spectrometer ...
    • Article  

      A fast route to modified gravitational growth 

      Baker, T.; Ferreira, P.; Skordis, C. (2014)
      The growth rate of the large-scale structure of the Universe has been advocated as the observable par excellence for testing gravity on cosmological scales. By considering linear-order deviations from general relativity, ...
    • Article  

      Femtosecond carrier dynamics in implanted and highly annealed polycrystalline silicon 

      Lioudakis, Emmanouil E.; Nassiopoulou, Androula Galiouna; Othonos, Andreas S. (2006)
      We have studied the ultrafast optical response of highly implanted and highly annealed polycrystalline silicon films using 400 nm ultrashort amplified pulses with fluence ranging between 8 mJ cm-2 to 56 mJ cm -2. Transient ...
    • Article  

      Femtosecond carrier dynamics in In 2O 3 nanocrystals 

      Othonos, Andreas S.; Zervos, Matthew; Tsokkou, Demetra (2009)
      We have studied carrier dynamics in In 2O 3 nanocrystals grown on a quartz substrate using chemical vapor deposition. Transient differential absorption measurements have been employed to investigate the relaxation dynamics ...
    • Article  

      Femtosecond carrier dynamics of Inx Ga1-x N thin films grown on GaN (0001): Effect of carrier-defect scattering 

      Lioudakis, Emmanouil E.; Othonos, Andreas S.; Iliopoulos, Eleftherios; Tsagaraki, K.; Georgakilas, A. (2007)
      Ultrafast carrier dynamics in ultrathin Inx Ga1-x N ternary alloys were investigated in detail, using femtosecond transient differential optical absorption measurements. Measurements were performed with probing wavelengths ...
    • Article  

      Femtosecond dynamics in single wall carbon nanotube/poly(3-hexylthiophene) composites 

      Lioudakis, Emmanouil E.; Othonos, Andreas S.; Alexandrou, Ioannis (2008)
      Femtosecond transient absorption measurements on single wall carbon nanotube/poly(3-hexylthiophene) composites are used to investigate the relaxation dynamics of this blended material. The influence of the addition of ...
    • Conference Object  

      Femtosecond laser inscription of Bragg and complex gratings in coated and encapsulated silica and low-loss polymer optical fibers 

      Kalli, Kyriacos; Lacraz, A.; Polis, M.; Othonos, Andreas S. (SPIE, 2015)
      The development of wavelength filters, such as Bragg and superstructure gratings in glass and polymer optical fibers, using a femtosecond laser is reported. By using a femtosecond laser operating in the green, which offers ...
    • Article  

      Femtosecond time-resolved study in InxGa1-xN (0001) ultrathin epilayers: Effects of high indium mole fraction and thickness of the films 

      Lioudakis, Emmanouil E.; Othonos, Andreas S.; Dimakis, Emmanouil; Georgakilas, A. (2006)
      In view of promising full-solar-spectrum photovoltaic systems based on Inx Ga1-x N ternary alloys, femtosecond time-resolved study in ultrathin epilayers was employed in order to extract the fundamental properties of ...
    • Article  

      Fermion-monopole system reexamined. IV 

      Panagopoulos, Haralambos G.; Yamagishi, H. (1985)
      The chiral properties of the fermion-monopole system are investigated in detail. For one species of massless Dirac fermions, we show that the chiral symmetry is spontaneously broken, even in the presence of anomalies. The ...
    • Conference Object  

      Few-electron systems in a quantum dot in a magnetic field: The Wigner molecule and paired electron phases 

      Avetisyan, A. A.; Moulopoulos, Konstantinos (2006)
      We have developed a variational many-body description for few-electron systems in a parabolic quantum dot in an external magnetic field. The ground state energy of the electronic system has been theoretically investigated ...
    • Article  

      Few-electron systems in a quantum dot in a magnetic field: Wigner phase and broken-symmetry spin-singlet state 

      Avetisyan, A. A.; Moulopoulos, Konstantinos; Djotyan, Anahit P. (2008)
      The nature of the ground state of a few-electron system in a parabolic two-dimensional (2D) quantum dot (QD) is theoretically investigated on the basis of a variational many-body approach within a second quantized formulation. ...
    • Article  

      Fiber Bragg gratings 

      Othonos, Andreas S. (1997)
      Since the discovery of photosensitivity in optical fibers there has been great interest in the fabrication of Bragg gratings within the core of a fiber. The ability to inscribe intracore Bragg gratings in these photosensitive ...
    • Book  

      Fiber Bragg gratings fundamentals and applications in telecommunications and sensing 

      Othonos, Andreas S.; Kalli, Kyriacos (Artech House, 1999)
    • Conference Object  

      Fiber Bragg-grating-based laser sensor 

      Wallace, Colin G.; Othonos, Andreas S.; Uttamchandani, Deepak G. (1995)
      Fiber Bragg gratings are attracting increasing attention as sensors for the measurement of strain, temperature, and pressure. They are equally important as wavelength selective reflectors for fiber, and to a lesser extent, ...
    • Conference Object  

      Fiber laser sensor array 

      Alavie, A. Tino; Karr, Shawn E.; Othonos, Andreas S.; Measures, Raymond M. (Publ by Society of Photo-Optical Instrumentation Engineers, 1993)
      An intracore Bragg grating and a broadband reflector are used as cavity end mirrors of a tunable Erbium-doped fiber laser where the Bragg grating serves the dual purpose of the tuning element and the sensor. This fiber ...
    • Article  

      Fibre Bragg gratings 

      Othonos, Andreas S.; Kalli, Kyriacos; Pureur, D.; Mugnier, A. (2006)
    • Article  

      Field dependent free ion yields of room temperature tetramethyl liquids and their mixtures 

      Geer, S.; Holroyd, R. A.; Ptohos, Fotios (1990)
      Ionization currents and free ion yields have been measured as a function of the applied electric field in tetramethylgermanium and tetramethylin exposed to energetic gamma rays, and in binary mixtures of 2,2,4,4 ...
    • Article  

      Field strength correlations in the QCD vacuum 

      Di Giacomo, A.; Panagopoulos, Haralambos G. (1992)
      We determine by numerical simulation on a lattice the correlation function of the gauge field strengths in the QCD vacuum. © 1992.
    • Article  

      Field strength correlators in QCD at zero and non-zero temperature 

      Di Giacomo, A.; Meggiolaro, E.; Panagopoulos, Haralambos G. (1997)
      We study, by numerical simulations on a lattice, the behaviour of the gauge-invariant field strength correlators in QCD both at zero temperature, down to a distance of 0.1 fm, and at finite temperature, across the deconfinement ...
    • Article  

      Field-independent anisotropy in layered superconductors 

      Theodorakis, Stavros; Feinberg, D. (1992)
      Multilayered superconducting SW structures with inequivalent layers are considered, where superconductivity in W (weakly superconducting) layers is induced through their proximity with the S (strongly superconducting) ...