Browsing by Keywords "Physics"

Now showing items 1-20 of 24

    • Active physics 

      Eisenkraft, Arthur (It's About Time, 2016)

    • Anti-de sitter-wave solutions of higher derivative theories 

      Gürses, M.; Hervik, S.; Şişman, T. Ç.; Tekin, B. (American Physical Society, 2013)
      We show that the recently found anti-de Sitter (AdS)-plane and AdS-spherical wave solutions of quadratic curvature gravity also solve the most general higher derivative theory in D dimensions. More generally, we show that ...

    • Archimedes' principle as an application of the divergence theorem 

      Altintas, A. (Institute of Electrical and Electronics Engineers, 1990)
      A derivation is provided that allows one to obtain Archimedes' principle as an application of the divergence theorem.

    • Beaming of light and enhanced transmission via surface modes of photonic crystals 

      Bulu, I.; Caglayan, H.; Ozbay, E. (Optical Society of America, 2005-11-15)
      We report beaming and enhanced transmission of electromagnetic waves by use of surface corrugated photonic crystals. The modes of a finite-size photonic crystal composed of dielectric rods in free space have been analyzed ...

    • Conductance of ferromagnetic nanowires 

      Mehrez, H.; Ciraci, S. (American Physical Society, 1998)
      The conductance distribution obtained from an ensemble of stretching ferromagnetic nanowires or point contacts do not exhibit peaks near the integer multiples of 2e2/h. This observation has been interpreted as the absence ...

    • Diodelike asymmetric transmission of linearly polarized waves using magnetoelectric coupling and electromagnetic wave tunneling 

      Mutlu, M.; Akosman, A. E.; Serebryannikov, A. E.; Ozbay, E. (American Physical Society, 2012-05-24)
      An asymmetric, reciprocal, diffraction-free transmission of linearly polarized waves in a new diodelike, three-layer, ultrathin, chiral structure is studied theoretically and experimentally. The exploited physical mechanism ...

    • Effective mass calculations for two-dimensional gas of dipolar fermions 

      Seydi, I.; Abedinpour, S. H.; Tanatar, B. (Springer New York LLC, 2017)
      We consider a two-dimensional system of ultracold dipolar fermions with dipole moments aligned in the perpendicular direction. We use the static structure factor information from Fermi-Hypernetted-Chain calculations to ...

    • Exohydrogenated single-wall carbon nanotubes 

      Yildirim, T.; Gülseren, O.; Ciraci, S. (American Physical Society, 2001)
      An extensive first-principles study of fully exohydrogenated zigzag (n,0) and armchair (n,n) single-wall carbon nanotubes (CnHn), polyhedral molecules including cubane, dodecahedrane, and C60H60 points to crucial differences ...

    • First-principles investigation of structural and electronic properties of solid cubane and its doped derivatives 

      Yildirim, T.; Ciraci, S.; Kılıç, Ç.; Buldum, A. (American Physical Society, 2000)
      The electronic and structural properties of molecular and solid cubane have been studied by first-principles, self-consistent field total energy calculations. Calculated molecular properties such as equilibrium geometry ...

    • First-principles study of the iron pnictide superconductor BaFe2 As2 

      Aktürk, E.; Ciraci, S. (American Physical Society, 2009)
      This paper presents our study on the atomic, electronic, magnetic structures, and phonon modes of the low-temperature orthorhombic phase of undoped BaFe2As2 crystal. The electronic structure is characterized by a sharp ...

    • Inflation and inflation uncertainty: a dynamic framework 

      Berument, M. H.; Yalcin, Y.; Yildirim J. (Elsevier BV, 2012)
      This paper aims to investigate the direct relationship between inflation and inflation uncertainty by employing a dynamic method for the monthly country-region-place United States data for the time period 1976-2007. While ...

    • A measurable force driven by an excitonic condensate 

      Hakioǧlu, T.; Özgün, E.; Günay, M. (American Institute of Physics Inc., 2014)
      Free energy signatures related to the measurement of an emergent force (≈10-9N) due to the exciton condensate (EC) in Double Quantum Wells are predicted and experiments are proposed to measure the effects. The EC-force is ...

    • Metal-insulator transition induced by random dipoles 

      Larcher, M.; Menotti, C.; Tanatar, B.; Vignolo, P. (American Physical Society, 2013)
      We study the localization properties of a test dipole feeling the disordered potential induced by dipolar impurities trapped at random positions in an optical lattice. This random potential is marked by correlations which ...

    • Nonequilibrium fractional Hall response after a topological quench 

      Ünal, F. N.; Mueller, E. J.; Oktel, M. O. (American Physical Society, 2016)
      We theoretically study the Hall response of a lattice system following a quench where the topology of a filled band is suddenly changed. In the limit where the physics is dominated by a single Dirac cone, we find that the ...

    • ODTü Fizik Bölümü Tarihi 

      Ulu, Bora; Turan, Eray; Ünal, Batuhan Kürşat; Demir, İrem; Dal, Deniz (Bilkent University, 2018)
      Orta Doğu Teknik üniversitesi 15 Kasım 1956 tarihinde Orta Doğu Yüksek Teknoloji Enstitüsü adı altında kuruldu. ODTü Fizik Bölümü ise 1960 yılında kurulmuştur. Bu çalışmada bölümün kuruluşundan itibaren öğretim üyeleri, ...

    • On existence of an x-integral for a semi-discrete chain of hyperbolic type 

      Zheltukhin K.; Zheltukhina N. (Institute of Physics Publishing, 2016)
      A class of semi-discrete chains of the form t1x = f (x,t,t1,tx) is considered. For the given chains easily verifiable conditions for existence of x-integral of minimal order 4 are obtained. © Published under licence by IOP ...

    • On the stabilization of periodic orbits for discrete time chaotic systems 

      Morgül, Ö. (Elsevier, 2005-02)
      In this Letter we consider the stabilization problem of unstable periodic orbits of discrete time chaotic systems. We propose a novel and simple periodic delayed feedback law and present some stability results. These results ...

    • Pentagonal nanowires: a first-principles study of the atomic and electronic structure 

      Sen, P.; Gülseren, O.; Yildirim, T.; Batra, I. P.; Ciraci, S. (American Physical Society, 2002)
      We performed an extensive first-principles study of nanowires in various pentagonal structures by using pseudopotential plane wave method within the density functional theory. Our results show that nanowires of different ...

    • The power of physical representations 

      Akman, V.; ten Hagen, P. J. W. (AAAI Press, 1989)
      Commonsense reasoning about the physical world, as exemplified by 'Iron sinks in water' or 'If a ball is dropped it gains speed,' will be indispensable in future programs. We argue that to make such predictions (namely, ...

    • Reversible band-gap engineering in carbon nanotubes by radial deformation 

      Gülseren, O.; Yildirim, T.; Ciraci, S.; Kılıç, Ç. (American Physical Society, 2002-03)
      We present a systematic analysis of the effect of radial deformation on the atomic and electronic structure of zigzag and armchair single wall carbon nanotubes using the first-principle plane wave method. The nanotubes ...