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Listar por palabra clave "Time domain"

Mostrando ítems 1-10 de 10

A time and frequency domain analysis of the effect of vibrating fuel assemblies on the neutron noise

Vidal-Ferràndiz, Antoni; Carreño, Amanda; Ginestar Peiro, Damián; Demazière, C.; Verdú Martín, Gumersindo Jesús (Elsevier, 2020-03)

[EN] The mechanical vibrations of fuel assemblies have been shown to give rise to high levels of neutron noise, triggering in some circumstances the necessity to operate nuclear reactors at a reduced power level. This work ...
Explicit finite-difference time-domain scheme for the simulation of 1-3 piezoelectric effect in axisymmetrical configurations

Ferri García, Marcelino; Camarena Femenia, Francisco; Redondo, Javier; Picó Vila, Rubén; Avis, Mark R. (Elsevier, 2012-09)

[EN] Numerical simulations are useful in the processes of design, development and optimization of transducers for non-destructive testing. In this work, a three-dimensional velocity-stress finite-difference model is presented ...
Modelling and simulations of reactor neutron noise induced by mechanical vibrations

Vidal-Ferràndiz, Antoni; Ginestar Peiro, Damián; Carreño, Amanda; Verdú Martín, Gumersindo Jesús; Dokhane, A.; Verma, V.; Perin, Y.; Herb, J.; Mylonakis, A.; Demazière, Christophe; Vinai, P. (Elsevier, 2022-11)

[EN] Mechanical vibrations of core internals are among the main perturbations that induce oscillations in the neutron flux field, also known as neutron noise. In this work, different simulation models for the study of the ...
Moisture profiles in cheese drying determined by TD-NMR: Mathematical modeling of mass transfer

Castell Palou, A; Rossello, Carmen; Femenia, Antoni; Bon Corbín, José; Simal, S. (Elsevier, 2011-06)

[EN] A time-domain nuclear magnetic resonance (TD-NMR) method is proposed to quick and easily determine moisture profiles during cheese drying. The method consists of a combined relaxation analysis, where the magnetization ...
Nmr relaxation reveals modifications in rubber phase dynamics during long-term degradation of high-impact polystyrene (HIPS)

Vilaplana, Francisco; Karlsson, Sigbritt; Ribes-Greus, A.; Schade, Christian; Nestle, Nikolaus (ELSEVIER SCI LTD, 2011)

[EN] The microstructure of rubber-modified polystyrene after thermal ageing at 90 °C and multiple extrusion was analyzed by time-domain nuclear magnetic resonance (TD-NMR) in a non-destructive manner. The transverse ...
PARCS vs CORE SIM neutron noise simulations

Olmo-Juan, Nicolás; Demazière, Christophe; Barrachina, T.; Miró Herrero, Rafael; Verdú Martín, Gumersindo Jesús (Elsevier, 2019-08)

[EN] In a nuclear reactor, even operating at full power and steady-state conditions, fluctuations are detected in the recording of any process parameter. These fluctuations (also called noise) could be of various origins, ...
Periodic time-domain modulation for the electrically tunable control of optical pulse train envelope and repetition rate multiplication

Tainta, Santiago; Erro Betran, Mª Jose; Amaya Ocampo, Waldimar Alexander; Garde. María José; Sales Maicas, Salvador; Muriel Fernandez, Miguel Angel (Institute of Electrical and Electronics Engineers (IEEE), 2012-01)

An electrically tunable system for the control of optical pulse sequences is proposed and demonstrated. It is based on the use of an electrooptic modulator for periodic phase modulation followed by a dispersive device to ...
Reconfigurable multiwavelength source based on electrooptic phase modulation of a pulsed laser

Beltrán Ramírez, Marta; Caraquitena Sales, José; Llorente Sáez, Roberto; Martí Sendra, Javier (Institute of Electrical and Electronics Engineers (IEEE), 2011-08-15)

[EN] A reconfigurable multiwavelength source based on time-domain electrooptic phase modulation of a pulsed laser is proposed and experimentally demonstrated. The technique permits great reconfiguration in the spectrum ...
Spectral self-imaging effect by time-domain multilevel phase modulation of a periodic pulse train

Caraquitena Sales, José; Beltrán, Marta; Llorente, Roberto; Martí Sendra, Javier; Muriel, Miguel A. (Optical Society of America, 2011)

[EN] We propose and analyze a novel (to our knowledge) approach to implement the spectral self-imaging effect of optical frequency combs. The technique is based on time-domain multilevel phase-only modulation of a periodic ...
Terahertz radiation shaping based on optical spectrum modulation in the time domain

Palací López, Jesús; Bockelt, Alexander Stefan; Vidal Rodriguez, Borja (Optical Society of America, 2012)

A terahertz shaping system based on optical fiber components as opposed to traditional free-space solutions is proposed. It is based on the time-domain modulation of the optical source spectrum. Standard singlemode fiber ...