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Mostrando ítems 54-73 de 118

    • openAccess   High order integrators obtained by linear combinations of symmetric-conjugate compositions 

      Casas, Fernando; Escorihuela-Tomàs, Alejandro Elsevier (2022-02-01)
      A new family of methods involving complex coefficients for the numerical integration of differential equations is presented and analyzed. They are constructed as linear combinations of symmetric-conjugate compositions ...

    • openAccess   Highly tempering infinite matrices 

      Bernal González, Luis; Conejero, J. Alberto; murillo arcila, marina; Seoane Sepúlveda, Juan Springer Milan (2017-02)
      In this short note, it is proved the existence of in nite matrices that not only preserve convergence and limits of sequences but also convert every mem- ber of some dense vector space consisting, except for zero, of ...

    • openAccess   Homomorphic encoders of profinite abelian groups I 

      Ferrer, María V.; Hernández, Salvador Elsevier (2023-05)
      Let {Gi |i ∈ N} be a family of finite Abelian groups. We say that a subgroup G ≤ i∈N Gi is order controllable if for every i ∈ N there is ni ∈ N such that for each c ∈ G, there exists a ∈ G satisfying that a|[1,i] = ...

    • openAccess   Hölder regularity for the Moore-Gibson-Thompson equation with infinite delay 

      Abadias, Luciano; Lizama, Carlos; murillo arcila, marina American Institute of Mathematical Sciences (AIMS) (2018-01)
      We characterize the well-posedness of a third order in time equation with infinite delay in Holder spaces, solely in terms of spectral properties concerning the data of the problem. Our analysis includes the case of the ...

    • openAccess   Interpolation sets in spaces of continuous metric-valued functions 

      Ferrer González, María Vicenta; Hernández, Salvador; Tárrega Ruiz, Luis Elsevier (2018-10)
      Let X and K be a Cech-complete topological group and a compact group, ˇ respectively. We prove that if G is a non-equicontinuous subset of CHom(X; K), the set of all continuous homomorphisms of X into K, then there is a ...

    • openAccess   Invertibles in topological rings: a new approach 

      Garcia-Pacheco, Francisco; Miralles, Alejandro; murillo arcila, marina Springer (2021-11-15)
      Every element in the boundary of the group of invertibles of a Banach algebra is a topological zero divisor. We extend this result to the scope of topological rings. In particular, we define a new class of semi-normed ...

    • openAccess   Locally recoverable J-affine variety codes 

      Galindo, Carlos; Hernando, Fernando; Munuera, Carlos (2020-06)
      A locally recoverable (LRC) code is a code over a finite eld Fq such that any erased coordinate of a codeword can be recovered from a small number of other coordinates in that codeword. We construct LRC codes correcting ...

    • openAccess   Lower bounds for the volume with upper bounds for the Ricci Curvature in dimension three 

      Gimeno, Vicent Wiley (2020)
      In this note, we provide several lower bounds for the volume of a geodesic ball within the injectivity radius in a 3‐dimensional Riemannian manifold assuming only upper bounds for the Ricci curvature.

    • openAccess   Maximal lp-regularity for discrete time Volterra equations with delay 

      Lizama, Carlos; murillo arcila, marina Taylor & Francis (2019-07-08)
      In this paper, we investigate the existence and uniqueness of solutions belonging to the vector-valued space ℓp(Z,X) by using Blunck's theorem on the equivalence between operator-valued ℓp-multipliers and the notion of ...

    • openAccess   MDS, Hermitian almost MDS, and Gilbert–Varshamov quantum codes from generalized monomial-Cartesian codes 

      Barbero Lucas, Beatriz; Hernando, Fernando; Martín-Cruz, Helena; McGuire, Gary Springer Nature (2024-03-01)
      We construct new stabilizer quantum error-correcting codes from generalized monomial-Cartesian codes. Our construction uses an explicitly defined twist vector, and we present formulas for the minimum distance and dimension. ...

    • openAccess   Method to determine which quantum operations can be realized with linear optics with a constructive implementation recipe 

      Garcia-Escartin, Juan Carlos; Gimeno, Vicent; Moyano-Fernández, Julio José American Physical Society (2019-08-02)
      The evolution of quantum light through linear optical devices can be described by the scattering matrix S of the system. For linear optical systems with m possible modes, the evolution of n input photons is given by a ...

    • openAccess   Modeling Influence of Soil Properties in Different Gradients of Soil Moisture: The Case of the Valencia Anchor Station Validation Site, Spain 

      CARBÓ , ESTER; Juan, Pablo; Añó, Carlos; Chaudhuri, Somnath; Díaz-Avalos, Carlos; Lopez-Baeza, Ernesto Taylor and Francis (2021-12-19)
      The prediction of spatial and temporal variation of soil water content brings numerous benefits in the studies of soil. However, it requires a considerable number of covariates to be included in the study, complicating ...

    • openAccess   Modeling spatial dependencies of natural hazards in coastal regions: a nonstationary approach with barriers 

      Chaudhuri, Somnath; Juan, Pablo; Serra, Laura; Varga, Diego; Saez, Marc Springer (2023)
      Natural hazards like floods, cyclones, earthquakes, or, tsunamis have deep impacts on the environment and society causing damage to both life and property. These events can cause widespread destruction and can lead to ...

    • openAccess   Multiple photon effective Hamiltonians in linear quantum optical networks 

      García-Escartín, Juan Carlos; Gimeno, Vicent; Moyano-Fernández, Julio José Elsevier (2019)
      We give an alternative derivation for the explicit formula of the effective Hamiltonian describing the evolution of the quantum state of any number of photons entering a linear optics multiport. The description is based ...

    • openAccess   New and improved orbits of historical comets: Late 4th and 5th century 

      Marco Castillo, Francisco José; Martínez Usó, María José; Sicoli, Piero; Gorelli, Roberto Elsevier (2022-05-22)
      Since as early as the 19th century, many scholars have devoted themselves to the calculation of sets of orbital elements for particular historical comets. In many cases, these studies have led to proposing orbits that have ...

    • openAccess   New binary and ternary LCD codes 

      Galindo, Carlos; Geil, Olav; Hernando, Fernando; Ruano, Diego IEEE (2018-05-09)
      LCD codes are linear codes with important cryptographic applications. Recently, a method has been presented to transform any linear code into an LCD code with the same parameters when it is supported on a finite field ...

    • openAccess   No-go theorems for photon state transformations in quantum linear optics 

      V. Parellada, Pablo; Gimeno i Garcia, Vicent; Moyano-Fernández, Julio José; Garcia-Escartin, Juan Carlos Elsevier (2023)
      We give a necessary condition for photon state transformations in linear optical setups preserving the total number of photons. From an analysis of the algebra describing the quantum evolution, we find a conserved quantity ...

    • openAccess   Norm-Attaining Tensors and Nuclear Operators 

      Dantas, Sheldon; Jung, Mingu; Roldán, Óscar; Rueda Zoca, Abraham Springer (2022-06)
      Given two Banach spaces X and Y, we introduce and study a concept of norm-attainment in the space of nuclear operators (𝑋�,𝑌�) and in the projective tensor product space 𝑋�⊗ˆ𝜋�𝑌�. We exhibit positive and negative ...

    • openAccess   Novel symplectic integrators for the Klein-Gordon equation with space- and time-dependent mass 

      Bader, Philipp; Blanes, Sergio; Casas, Fernando; Kopylov, Nikita Elsevier (2019-04)
      We consider the numerical time-integration of the non-stationary Klein–Gordon equation with position- and time-dependent mass. A novel class of time-averaged symplectic splitting methods involving double commutators is ...

    • openAccess   Numerical integrators based on the Magnus expansion for nonlinear dynamical systems 

      Hajiketabi, M.; Casas, Fernando Elsevier (2020-03-15)
      Explicit numerical integration algorithms up to order four based on the Magnus expansion for nonlinear non-autonomous ordinary differential equations are presented and tested on problems possessing qualitative (very often, ...