Browsing DFis-Artículos, capítulos, libros... by Title
Now showing items 52-71 of 135
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Floating potential in electronegative plasmas for non-zero ion temperatures
(2018)The floating potential of a Langmuir probe immersed in an electronegative plasma is studied theoretically under the assumption of radial positive ion fluid movement for non-zero positive ion temperature: both cylindrical and ... -
Floating potential method using a thermionic emissive probe including an ionizing and collisional presheath.
(IOP Publishing, 2022)This article studies the interaction of an argon plasma with an emissive probe considering the effect of both ionization and ion-neutral collisions. The floating potential is determined from the I-V characteristic curves ... -
Gamma Dose Rate Measurements in Northern Spain: Influence of Local Meteorological Scenarios on Radiological “False Alarms” in a Real-Time Radiological Monitoring Network
(MDPI, 2024)The present study characterizes gamma dose rate (GDR) concentrations in Bilbao, located in the northern Iberian Peninsula, utilizing a comprehensive 10-min interval database spanning from 2009 to 2018. This station belongs ... -
Gap variability upon packing in organic photovoltaics
(Plos, 2020-06-16)The variation of the HOMO-LUMO band gap is explored for varying packing arrangements of the 4mod BT-4TIC donor-acceptor molecule pair, by means of a high-throughput ab-initio random structure search of packing possibilities. ... -
Gas temperature and air fraction diagnosis of helium cold atmospheric plasmas by means of atomic emission lines
(Elsevier, 2022)In this work, we present a new method allowing the determination of both the gas temperature and the air fraction in non-thermal atmospheric helium plasmas. This new UV-Atomic Emission Spectroscopy technique based on the ... -
Gas temperature determination in microwave discharges at atmospheric pressure by using different Optical Emission Spectroscopy techniques
(Elsevier, 2013)Non-thermal plasmas sustained at atmospheric pressure are considered as a very promising technology for different purposes, in which the knowledge of the gas temperature is an important issue. In this paper, the gas ... -
Heat pulse propagation and anomalous electron heat transport measurements on the optimized stellarator W7-X
(IOP Publishing, 2021)The optimized stellarator Wendelstein 7-X (W7-X) is designed to have an approximately quasi-isodynamic magnetic configuration with reduced neoclassical transport in comparison to a classical stellarator, and turbulent ... -
High-performance plasmas after pellet injections in Wendelstein 7-X
(IOP Publishing, 2020)A significant improvement of plasma parameters in the optimized stellarator W7-X is found after injections of frozen hydrogen pellets. The ion temperature in the post-pellet phase exceeds 3 keV with 5 MW of electron heating ... -
Impact of the temperature ratio on turbulent impurity transport in Wendelstein 7-X
(IOP Publishing, 2020)First experimental observations in the Wendelstein 7-X stellarator indicate that the impurity confinement can be explained by turbulent processes. In particular, plasma discharges with increased ion to electron temperature ... -
Increasing the production of high-quality graphene nanosheet powder: The impact of electromagnetic shielding of the reaction chamber on the TIAGO torch plasma approach
(Elsevier, 2024)Microwave-induced plasmas (MIPs), and specifically the TIAGO device (Torche à Injection Axiale sur Guide d’Ondes), offer a streamlined, cost-effective, and environmentally friendly technique for producing high-quality ... -
Influence of collisions in a fluid model for the warm-ion sheath around a cylindrical Langmuir probe
(IOP Publishing, 2019)A long cylindrical Langmuir probe immersed in a collisional plasma is modelled by using fluid equations in which the collision term is introduced assuming a constant ion mean free path. The physical magnitudes of the system ... -
Influence of gas flow on the axial distribution of densities, temperatures and thermodynamic equilibrium degree in surface-wave plasmas sustained at atmospheric pressure
(Elsevier, 2019)In this paper, a discussion about the influence of the gas flow on the axial distribution of plasma densities, temperatures and thermodynamic equilibrium degree in argon surface-wave discharges sustained at atmospheric ... -
Influence of the argon admixture on the reactive oxide species formation inside an atmospheric pressure oxygen plasma jet
(Nature, 2024-02-10)In this work, a new atmospheric pressure plasma generated in a wire-to-multiwire dielectric barrier discharge on pure oxygen is introduced. This special geometry of 13 wires (one central wire and 12 ones on the external ... -
Innovación docente en las jornadas de recepción de alumnado de E.S.O. y Bachillerato al Departamento de Física
(UCOPress, 2017)Este proyecto ha tratado de incorporar la participación de alumnos del Grado de Física, en concreto de 4º curso, en una de las actividades que se realizan en el Departamento de Física, las “Jornadas de recepción de alumnado ... -
Ion injection in electrostatic particle-in-cell simulations of the ion sheath
(2017)A particle injection algorithm has been developed for its use in electrostatic particle-in-cell (PIC) simulations of the ion sheath which takes place in the surroundings of a planar electrode immersed in a plasma when ... -
Ionization and excitation probabilities of a hydrogen atom suddenly released from penetrable confinement
(Taylor & Francis, 2018)The problem of the stability of the hydrogen atom when it is released from a confining environment is studied. The stability is analysed in terms of excitation and ionization probabilities of the final state for different ... -
Ionization probability of the hydrogen atom suddenly released from confinement
(Wiley, 2017)The problem of the stability of a confined atom when it is extracted from the confining cavity has been investigated, modeled by a spherical hard wall potential. The ionization probability when the atom is released from ... -
Isotopic effects on covalent bond confined in a penetrable sphere
(American Chemical Society, 2015)A model of confinement of the covalent bond by a finite potential beyond the Born−Oppenheimer approximation is presented. A two-electron molecule is located at the center of a penetrable spherical cavity. The Schrödinger ... -
LiH−(X2Σ+)+3,4He rotational quenching at ultralow energies: spin-flip and isotopic effects from quantum dynamics on an ionic system
(Springer, 2009)We study in this work the quantum scattering between a helium atom and a LiH− molecule at low and ultralow energies. For the noble gas we have considered the two natural isotopes 3He, 4He, plus a “mock” 3.5He. Our aim ... -
Local weather phenomenon Galerna influences daily radon concentrations in northern Iberian Peninsula
(Elsevier, 2024)One of the main factors that affect urban air quality is meteorology. The objective of this study is to understand and characterise the influence that “Galerna” (GL) (an abrupt westerly change over the northern coast of ...