Exploració per tema "Helium"
Ara es mostren els items 1-20 de 22
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A rockoon closed helium buoyancy system; a first assessment
(British Interplanetary Society, 2023-03-30)
Article
Accés obertIt is believed that the use of rockoons will revolutionize the space industry by giving priority service to microsatellite developers that now are secondary payloads for large rocket companies. However, stratospheric ... -
ARMA model maximum entropy power spectral estimation
(1984-10)
Article
Accés obert -
Atomistic simulations and theoretical predictions of helium nucleation in liquid Pb-Li eutectic alloy
(2022)
Text en actes de congrés
Accés restringit per política de l'editorialLiquid Lead-Lithium Eutectic (LLE) alloy is a promising candidate coolant and/or breeder to attain tritium self-sufficiency in the EU DEMO breeding blanket design. Liquid metals are characterized with excellent heat-transport ... -
Carbon dioxide and helium dissolved gases in groundwater at central Tenerife Island, Canary Islands: chemical and isotopic characterization
(2015-10)
Article
Accés restringit per política de l'editorialSeismic-volcanic unrest was detected between 2004 and 2005 in the central and northwest zones of Tenerife Island (Canary Islands, Spain). With the aim of strengthening the program of geochemical and seismic-volcanic ... -
Development of flow regime maps for lead lithium eutectic–helium flows
(2020-09-01)
Article
Accés obertnstitute for Plasma Research (IPR), Gandhinagar (India) is currently involved in the design and development of its Lead-Lithium Ceramic Breeder (LLCB) module for testing in the International Thermo-nuclear Experimental ... -
Estudi i disseny del xassís d’un dron sustentat amb gas heli
(Universitat Politècnica de Catalunya, 2023-07-05)
Treball Final de Grau
Accés restringit per acord de confidencialitatL'objectiu d'aquest projecte és crear un dron sostingut amb heli que potenciï i millori l'autonomia i l'adaptabilitat dels drons comercials. El dron pot volar durant períodes més llargs utilitzant heli com a agent d'elevació, ... -
Excitonic insulator to superconductor phase transition in ultra-compressed helium
(2023-07-25)
Article
Accés obertHelium, the second most abundant element in the universe, exhibits an extremely large electronic band gap of about 20 eV at ambient pressures. While the metallization pressure of helium has been accurately determined, thus ... -
First-principles modeling of three-body interactions in highly compressed solid helium
(2015-12-31)
Article
Accés obertWe present a set of three-body interaction models based on the Slater-Kirkwood (SK) potential that are suitable for the study of the energy, structural, and elastic properties of solid He4 at high pressure. Our effective ... -
Henry's constant of helium in liquid alkali metals
(2024-02)
Article
Accés obertThe determination of the solubility of helium in liquid lithium and in lead-lithium eutectic systems is of crucial importance for the assessment of the reliability, safety and efficiency of future nuclear reactor plants ... -
High altitude balloon mission design and implementation for a mini-launcher
(Universitat Politècnica de Catalunya, 2011-04-08)
Treball Final de Grau
Accés obertDurante muchos años, las sondas estratosféricas han sido usadas para experimentos atmosféricos. Los nuevos globos de LATEX de bajo coste permiten poner hasta 4 kilogramos de carga de pago en el espacio cercano. Típicamente, ... -
Layering transition in superfluid helium adsorbed on a carbon nanotube mechanical resonator
(American Institute of Physics (AIP), 2019-04-23)
Article
Accés obertHelium is recognized as a model system for the study of phase transitions. Of particular interest is the superfluid phase in two dimensions. We report measurements on superfluid helium films adsorbed on the surface of a ... -
Liquid and solid phases of He-3 on graphite
(2016-04-04)
Article
Accés obertRecent heat-capacity experiments show quite unambiguously the existence of a liquid He-3 phase adsorbed on graphite. This liquid is stable at an extremely low density, possibly one of the lowest found in nature. Previous ... -
Microscopic approach to the response of 3 - 4 He mixtures
(American Physical Society (APS), 1996-10-01)
Article
Accés obertCorrelated-basis-function perturbation theory is used to evaluate the zero-temperature response S(q,¿) of 3-4He mixtures for inelastic neutron scattering, at momentum transfers q ranging from 1.1 to 1.8 A°-1. We adopt a ... -
Neutron Ionization of Helium near the Neutron-Alpha Particle Collision Resonance
(IOP, 2020-09-10)
Article
Accés obertNeutron-impact single and double ionization cross sections of the He atom are calculated near the neutron-alpha particle collision resonance. Calculations using the time-dependent close-coupling method for total and ... -
Nucleation of helium in liquid lithium at 843 K and high pressures
(Multidisciplinary Digital Publishing Institute (MDPI), 2022-04-13)
Article
Accés obertFusion energy stands out as a promising alternative for a future decarbonised energy system. In order to be sustainable, future fusion nuclear reactors will have to produce their own tritium. In the so-called breeding ... -
Nucleation of helium in pure liquid lithium
(American Institute of Physics (AIP), 2023-07-14)
Article
Accés obertTritium self-sufficiency in fusion nuclear reactors will be based on the neutron capture by lithium in the so-called breeding blankets of the reactor, a nuclear reaction that will produce helium along with tritium. The low ... -
Partially Diffusive Helium-Silica Compound under High Pressure
(Institute of Physics (IOP), 2022-06-01)
Article
Accés obertHelium is the second most abundant element in the universe, and together with silica, they are important components of giant planets. Exploring the reactivity and state of helium and silica under high pressure is crucial ... -
Path integral Monte Carlo. Algorithms and applications to quantum fluids
(Universitat Politècnica de Catalunya, 2002-07-11)
Tesi
Accés obertPath integral Monte Carlo (PIMC) is a method suitable for quantum liquid simulations at finite temperature. We present in this thesis a study of PIMC dealing with the theory and algorithms related to it, and then two ... -
Phase diagrams of He-4 on flat and curved environments
(2013-06)
Article
Accés obertBy means of diffusion Monte Carlo calculations, we obtained the phase diagrams of a first and second layer of 4He on graphene and on the outside of different isolated armchair carbon nanotubes with radii in the range 3.42 ... -
Quantum halo states in helium tetramers
(2017-01-12)
Article
Accés obertThe universality of quantum halo states enables a comparison of systems from different fields of physics, as demonstrated in two- and three-body clusters. In the present work, we studied weakly bound helium tetramers in ...