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Beam-plasma dynamics in finite-length, collisionless inhomogeneous systems
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Engineering a Galinstan-based ferromagnetic fluid for heat management
Full text linkThe development of increasingly smaller electronic devices brings on heat dissipation challenges, which can severely hinder their performance. Consequently, there is a critical need to maintain the working temperature of these devices at optimal values. At room temperature, the versatile design and adaptability of fluidic thermal switches makes them an auspicious solution. In this work, the large heat conductivity and magnetic material compatibility of Galinstan motivated the production of a novel ferromagnetic fluid. Through mechanical alloying within an inert atmosphere, we embedded Ni microparticles in a Galinstan matrix, which provided a liquid metal with a ferromagnetic behavior. This fluid is suitable for a wide range of applications in thermal management. Here, we experimentally demonstrate that a Galinstan-based mixture containing 2.6 wt% of Ni can serve as heat exchange medium in a magnetically activated fluidic thermal switch device. This mixture establishes an optimal thermal bridge between heat source and sink, enabling heat dissipation from the source. This effect intensifies with the device operating frequency, reaching a maximum temperature span of 19.8 % and a maximum switching ratio of 1.26. These results demonstrate the potential of the developed fluid to be integrated into fluidic technologies for temperature control of electronic components.Engineering a Galinstan-based ferromagnetic fluid for heat managementpublishedVersio
The Impact of Operant Resources on the Task Performance of Learners via Knowledge Management Process
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Design, synthesis and theoretical simulations of novel spiroindane-based enamines as p-type semiconductors
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A Preliminary Analysis of a Nuclear Power Plant Startup for a Physics-Based Model of a Digital Twin
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Design of multi-luminescent silica-based nanoparticles for the detection of liquid organic compounds
Full text linkTracer testing in reservoir formations is utilised to determine residual oil saturation as part of optimum hydrocarbon production. Here, we present a novel detection method of liquid organic compounds by monodisperse SiO2 nanoparticles (NPs) containing two luminophores, a EuIII:EDTA complex and a newly synthesised fluorophore based on the organic boron-dipyrromethene (BODIPY)-moiety. The particles exhibited stable EuIII PL emission intensity with a long lifetime in aqueous dispersion. The fluorescence of the BODIPY was also preserved in the aqueous environment. The ratiometric PL detection technique was demonstrated by using toluene and 1-octanol as model compounds of crude oil. The optimal synthesis conditions were found to give NPs with a diameter of ~100 nm, which is suitable for transport through porous oil reservoir structures. The cytotoxicity of the NPs was confirmed to be very low for human lung cell and fish cell lines. These findings demonstrate the potential of the NPs to replace the hazardous chemicals used to estimate the residual oil saturation. Moreover, the ratiometric PL detection technique is anticipated to be of benefit in other fields, such as biotechnology, medical diagnostics, and environmental monitoring, where a reliable and safe detection of a liquid organic phase is needed.Design of multi-luminescent silica-based nanoparticles for the detection of liquid organic compoundspublishedVersio
A Concept for a Multipurpose Time-of-Flight Neutron Reflectometer at Compact Neutron Sources
Full text linkThe design of a time-of-flight neutron reflectometer proposed for the new generation of compact neutron sources is presented. The reflectometer offers the possibility to use spin-polarized neutrons. The reflectometer design presented here takes advantage of a cold neutron source and uses neutrons with wavelengths in the range of 2–15 Å for the unpolarized mode. In general, due to tight spatial restrictions and the need to avoid moving parts inside the beam channel, a multi-channel collimator guide and reflective neutron guide are used for the first section of the instrument. This enables definition of the desired wavelength band and easy selection of one out of three different Q-resolutions. A low background for the collimator system and the reflectometer is ensured by employing a tangential beam channel and an in-channel sapphire filter. The second section is the time-of-flight (TOF) system, which uses a double-disk neutron chopper followed by polarization elements, the sample environment and the neutron detector system. Monte Carlo simulations and neutron beamline intensity measurements are presented. The design considerations are adoptable for neutron sources where space is limited and sections of the instrument are in a high-radiation environment.A Concept for a Multipurpose Time-of-Flight Neutron Reflectometer at Compact Neutron SourcespublishedVersio
