Now showing items 21-40 of 525

    • Transitional behaviour in the transformation from active end planes to stable loops caused by annealing 

      Endo, Morinobu; Lee, Byoung-Ju; Kim, Yoong Ahm; Kim, Yong-jung; Muramatsu, Hiroyukim; Yanagisawa, Takahashi; Hayashi, Takuya; Terrones Maldonado, Mauricio; Dresselhaus, Mildred (IOP Publishing, 2003)
      "Here we investigate the stabilization process on the active outer/inner surfaces (or the end plane of a graphene sheet) for shortened cup-stacked-type carbon nanotubes caused by annealing, utilizing both analytic and ...
    • Theoretical characterization of several models of nanoporous carbon 

      Valencia Hernández, Felipe; Romero Castro, Aldo Humberto; Hernandez, Eduardo R.; Terrones Maldonado, Mauricio; Terrones Maldonado, Humberto (IOP Publishing, 2003)
      "Elastic, electronic and vibrational properties of seven models of nanoporous carbon are reported. The studied structures are periodic graphitic arrangements with heptagonal and octagonal rings of carbon, known as Schwarzites. ...
    • Curved nanostructured materials 

      Terrones Maldonado, Humberto; Terrones Maldonado, Mauricio (IOP Publishing, 2003)
      "Graphite is a layered material that is very flexible, in which each layer is able to curve in order to form cages, nanotubes, nanocoils, nanocones, etc. In this paper, we demonstrate that various synthetic routes are ...
    • Sistemas finitos bajo presión 

      Baltazar Rojas, Samuel Eleazar (2004)
      "El estudio de estructuras bajo condiciones extremas como altas presiones, pueden entregarnos nuevas configuraciones y/o situaciones que son metaestables bajo condiciones normales. Estas transiciones pueden estar asociadas ...
    • Barotropic FRW cosmologies with a Dirac-like parameter 

      Rosu Barbus, Haret-Codratian; López Sandoval, Román (2004)
      "Using the known connection between Schroedinger-like equations and Dirac-like equations in the supersymmetric context, we discuss an extension of FRW barotropic cosmologies in which a Dirac mass-like parameter is introduced. ...
    • Classical harmonic oscillator with Dirac-like parameters and possible applications 

      Rosu Barbus, Haret-Codratian; Cornejo Pérez, Octavio; López Sandoval, Román (2004)
      "We obtain a class of parametric oscillation modes that we call K-modes with damping and absorption that are connected to the classical harmonic oscillator modes through the “supersymmetric” one-dimensional matrix procedure ...
    • The hyperbolic, the arithmetic and the quantum phase 

      Saniga, Metod; Planat, Michel; Rosu Barbus, Haret-Codratian (2004)
      "We develop a new approach of the quantum phase in an Hilbert space of finite dimension which is based on the relation between the physical concept of phase locking and mathematical concepts such as cyclotomy and the ...
    • Mutually unbiased bases and finite projective planes 

      Saniga, Metod; Planat, Michel; Rosu Barbus, Haret-Codratian (2004)
      "It is conjectured that the question of the existence of a set of d+1 mutually unbiased bases in a d-dimensional Hilbert space if d differs from a power of a prime number is intimately linked with the problem of whether ...
    • New direction in nanotube science 

      Terrones Maldonado, Mauricio; Jorio, Ado; Endo, Morinobu; Rao, Apparao; Kim, Yoong Ahm; Hayashi, Takuya; Terrones Maldonado, Humberto; Charlier, Jean Christophe; Dresselhaus, George F.; Dresselhaus, Mildred (Elsevier, 2004)
      "We review the latest advances in the production and state-of-the art characterization of B- and N-doped carbon nanotubes (CNTs) and nanofibers. We briefly discuss different approaches to producing these novel doped ...
    • Novel curved and strained carbon-based nanostructures: a theoretical study of their electronic properties and their response to laser excitations. 

      Valencia Hernández, Felipe (2005)
      "In this thesis we review and discuss, from a theoretical point of view, the physical properties of a wide variety of carbon-based nano-materials. This work is focused on systems in which the atomic structures exhibit one ...
    • Espectroscopía óptica aplicada al análisis químico de la sangre 

      Araujo Andrade, Cuauhtémoc (2005)
      "El análisis de algunos constituyentes de la sangre provee información de diagnostico en los procedimientos clínicos. Motivo por el cual es de gran interés en la comunidad medica el desarrollo de métodos ópticos mediante ...
    • The three-step master equation: class of parametric stationary solutions 

      Rosu Barbus, Haret-Codratian; Reyes, Marco A.; Valencia Hernández, Felipe (2005)
      "We examine the three-step master equation from the standpoint of the general solution of the associated discrete Riccati equation. We report by this means stationary master solutions depending on a free constant parameter, ...
    • Synchronization of the frenet-serret linear system with a chaotic nonlinear system by feedback of states 

      Solís Perales, Gualberto Celestino; Rosu Barbus, Haret-Codratian; Hernández Rosales, Crescencio (2005)
      "A synchronization procedure of the generalized type in the sense of Rulkov et al [Phys. Rev. E 51, 980 (1995)] is used to impose a nonlinear Malasoma chaotic motion on the Frenet-Serret system of vectors in the differential ...
    • Frenet-Serret vacuum radiation, detection proposals and related topics 

      Rosu Barbus, Haret-Codratian (2005)
      "The paradigmatic Unruh radiation is an ideal and simple case of stationary vacuum radiation patterns related to worldlines defined as Frenet-Serret curves. We review the corresponding body of literature as well as the ...
    • Mutually unbiased phase states, phase uncertainties, and Gauss sums 

      Planat, Michel; Rosu Barbus, Haret-Codratian (2005)
      "Mutually unbiased bases (MUBs), which are such that the inner product between two vectors in different orthogonal bases is a constant equal to 1/d?, with d the dimension of the finite Hilbert space, are becoming more and ...
    • Nonlinear software sensor for monitoring genetic regulation processes with noise and modeling errors 

      Ibarra Junquera, Vrani; Torres González, Luis Adolfo; Rosu Barbus, Haret-Codratian; Argüello Astorga, Gerardo Rafael (2005)
      "Nonlinear control techniques by means of a software sensor that are commonly used in chemical engineering could be also applied to genetic regulation processes. We provide here a realistic formulation of this procedure ...
    • Riccati nonhermiticity with application to the Morse potential 

      Cornejo Pérez, Octavio; López Sandoval, Román; Rosu Barbus, Haret-Codratian (2005)
      "A supersymmetric one-dimensional matrix procedure, similar to the relationships of the same type between Dirac and Schrodinger equations in particle physics, is described in the general terms. By this means, we are able ...
    • Supersymmetric pairing of kinks for polynomial nonlinearities 

      Rosu Barbus, Haret-Codratian; Cornejo Pérez, Octavio (2005)
      "We show how one can obtain kink solutions of ordinary differential equations with polynomial nonlinearities by an efficient factorization procedure directly related to the factorization of their nonlinear polynomial part. ...