Now showing items 1-20 of 158

    • A computational model of open-irrigated electrode for endocardial RF catheter ablation 

      González-Suárez A.; Berjano E.; Guerra J.M.; Gerardo-Giorda L. (Computing in Cardiology, 2016-01-01)
      Radiofrequency catheter ablation (RFCA) is an important curative treatment for cardiac arrhythmias. However, during RFCA thrombus formation can occur when the electrode-tissue interface temperature exceeds 80°C. Open-irrigated ...
    • A differential equation with state-dependent delay from cell population biology 

      Getto P.; Waurick M. (Journal of Differential Equations, 2015-12-31)
      We analyze a differential equation, describing the maturation of a stem cell population, with a state-dependent delay, which is implicitly defined via the solution of an ODE. We elaborate smoothness conditions for the model ...
    • A model for stem cell population dynamics with regulated maturation delay 

      Alarcon T.; Getto P.; Marciniak-Czochra A.; Vivanco M.Dm. (Discrete and Continuous Dynamical Systems- Series A, 2011-12-31)
      We develop a structured population model for the maturation process of stem cells in the form of a state-dependent delay differential equation. Moreover, results on existence, uniqueness and positivity of solutions as well ...
    • A stylized model for the continuous double auction 

      Radivojevic T.; Anselmi J.; Scalas E. (Lecture Notes in Economics and Mathematical Systems, 2012-12-31)
      A stylized phenomenological model for the continuous double auction is introduced. This model is equivalent to two uncoupled M/M/1 queues. The conditions for statistical equilibrium (ergodicity) are derived. The results ...
    • Adapting Hybrid Monte Carlo methods for solving complex problems in life and materials sciences 

      Fernández-Pendás M. (2018-05-11)
      Efficient sampling is the key to success of molecular simulation of complex physical systems. Still, a unique recipe for achieving this goal is unavailable. Hybrid Monte Carlo (HMC) is a promising sampling tool offering a ...
    • Adaptive multi-stage integrators for optimal energy conservation in molecular simulations 

      Fernández-Pendás M.; Akhmatskaya E.; Sanz-Serna J.M. (Journal of Computational Physics, 2016-10-01)
      We introduce a new Adaptive Integration Approach (AIA) to be used in a wide range of molecular simulations. Given a simulation problem and a step size, the method automatically chooses the optimal scheme out of an available ...
    • Adaptive Splitting Integrators for Enhancing Sampling Efficiency of Modified Hamiltonian Monte Carlo Methods in Molecular Simulation 

      Akhmatskaya E.; Fernández-Pendás M.; Radivojevic T.; Sanz-Serna J. M. (Langmuir, 2017-10-24)
      The modified Hamiltonian Monte Carlo (MHMC) methods, i.e., importance sampling methods that use modified Hamiltonians within a Hybrid Monte Carlo (HMC) framework, often outperform in sampling efficiency standard techniques ...
    • Analytical evaluation of the performance of contact-Based messaging applications 

      Hernández-Orallo E.; Murillo-Arcila M.; Calafate C.T.; Cano J.C.; Conejero J.A.; Manzoni P. (Computer Networks, 2016-03-01)
      Communications in mobile opportunistic networks, instead of using the Internet infrastructure, take place upon the establishment of ephemeral contacts among mobile nodes using direct communication. In this paper, we ...
    • Anticipation via canards in excitable systems 

      Köksal Ersöz E.; Desroches M.; Mirasso C.; Rodrigues S. (Chaos: An Interdisciplinary Journal of Nonlinear Science, 2019-01-14)
      Neurons can anticipate incoming signals by exploiting a physiological mechanism that is not well understood. This article offers a novel explanation on how a receiver neuron can predict the sender’s dynamics in a ...
    • Assessment of van der Waals inclusive density functional theory methods for layered electroactive materials 

      Lozano A.; Escribano B.; Akhmatskaya E.; Carrasco J. (Physical Chemistry Chemical Physics, 2017-01-01)
      Computational-driven materials discovery requires efficient and accurate methods. Density functional theory (DFT) meets these two requirements for many classes of materials. However, DFT-based methods have limitations. One ...
    • Atomistic Insight into Ion Transport and Conductivity in Ga/Al-Substituted Li$_7$La$_3$Zr$_2$O$_{12}$ Solid Electrolytes 

      García Daza F. A.; Rincón Bonilla M.; Llordés A.; Carrasco J.; Akhmatskaya E. (ACS Applied Materials & Interfaces, 2018-12-12)
      Garnet-structured Li$_{7}$La$_{3}$Zr$_{2}$O$_{12}$ is a promising solid electrolyte for next-generation solid-state Li batteries. However, sufficiently fast Li-ion mobility required for battery applications only emerges ...
    • Band structures of cylindrical AlN/GaN quantum dots with fully coupled piezoelectric models 

      Prabhakar S.; Melnik R. (Proceedings of SPIE - The International Society for Optical Engineering, 2010-12-31)
      We study the coupled electro-mechanical effects in the band structure calculations of low dimensional semiconductor nanostructures (LDSNs) such as AlN/GaN quantum dots. Some effects in these systems are essentially nonlinear. ...
    • Band structures of laterally coupled quantum dots, accounting for electromechanical effects 

      Prabhakar S.; Melnik R.; Patil S. (Journal of Physics: Conference Series, 2010-12-31)
      In a series of recent papers we demonstrated that coupled electro-mechanical effects can lead to pronounced contributions in band structure calculations of low dimensional semiconductor nanostructures (LDSNs) such as quantum ...
    • Breast cancer dormancy can be maintained by small numbers of micrometastases 

      Willis L.; Alarcon T.; Elia G.; Jones J.L.; Wright N.A.; Tomlinson I.P.M.; Graham T.A.; Page K.M. (Cancer Research, 2010-12-31)
      Late relapse of breast cancer can occur more than 25 years after primary diagnosis. During the intervening years between initial treatment and relapse, occult cancers are maintained in an apparent state of dormancy that ...
    • Brinicles as a case of inverse chemical gardens 

      Cartwright J.H.E.; Escribano B.; González D.L.; Sainz-Díaz C.I.; Tuval I. (Langmuir, 2013-12-31)
      Brinicles are hollow tubes of ice from centimeters to meters in length that form under floating sea ice in the polar oceans when dense, cold brine drains downward from sea ice to seawater close to its freezing point. When ...
    • Causality, 'superluminality', and reshaping in undersized waveguides 

      Sokolovski D.; Akhmatskaya E. (ECCOMAS 2012 - European Congress on Computational Methods in Applied Sciences and Engineering, e-Book Full Papers, 2012-12-31)
      We analyse the reshaping mechanism leading to apparently 'superluminal' advancement of a pulse traversing an undersized section of a waveguide. For frequencies below the first inelastic threshold (cut off one), there are ...
    • Chemical-garden formation, morphology, and composition. I. Effect of the nature of the cations 

      Cartwright J.H.E.; Escribano B.; Sainz-Díaz C.I. (Langmuir, 2011-12-31)
      We have grown chemical gardens in different sodium silicate solutions from several metal-ion salts-calcium chloride, manganese chloride, cobalt chloride, and nickel sulfate-with cations from period 4 of the periodic table. ...
    • Chemical-garden formation, morphology, and composition. II. Chemical gardens in microgravity 

      Cartwright J.H.E.; Escribano B.; Sainz-Díaz C.I.; Stodieck L.S. (Langmuir, 2011-12-31)
      We studied the growth of metal-ion silicate chemical gardens under Earth gravity (1 g) and microgravity (μg) conditions. Identical sets of reaction chambers from an automated system (the Silicate Garden Habitat or SGHab) ...
    • Classification of resonance Regge trajectories and a modified Mulholland formula 

      Sokolovski D.; Akhmatskaya E. (Physics Letters, Section A: General, Atomic and Solid State Physics, 2011-12-31)
      We employ a simple potential model to analyze the effects which a Regge trajectory, correlating with a bound or a metastable state at zero angular momentum, has on an integral cross section. A straightforward modification ...
    • Coarse-graining RNA nanostructures for molecular dynamics simulations 

      Paliy M.; Melnik R.; Shapiro B.A. (Physical Biology, 2010-12-31)
      A series of coarse-grained models have been developed for study of the molecular dynamics of RNA nanostructures. The models in the series have one to three beads per nucleotide and include different amounts of detailed ...