Numerical Prediction of Fugitive Dust Dispersion on Reclaimed Land in Korea

Seo, Il Won; Lee, I.-B.; Shin, Myeong-Ho; Lee, G.-Y.; Hwang, Hyunseung; Hong, Seong‐Doo; Bitog, J. P.; Yoo, Jeong-Kun; Kwon, Kilsung; Kim, Y.-H.; Bartzanas, Thomas

doi:10.13031/2013.30072

Cited by 116 publications

(166 citation statements)

References 18 publications

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“…Although room temperature magnetism and proximity effects have been reported using vdW magnets, [20][21][22] the lack of active spintronic device operation at room temperature significantly limits its practical application potential. [21,23,24] Furthermore, a lateral room temperature spin-valve device with vdW metallic magnets, an essential building block for proposed spin-based memory, logic, and neuromorphic computing architectures [25][26][27][28] has not been realized yet.…”

Section: Introductionmentioning

confidence: 99%

A Room‐Temperature Spin‐Valve with van der Waals Ferromagnet Fe₅GeTe₂/Graphene Heterostructure

et al. 2023

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can allow the discovery of basic new physical phenomena and the development of new device concepts. [1] The discovery of new vdW quantum materials and their heterostructures starting from graphene, insulators, semiconductors, superconductors, and topological materials has revolutionized both fundamental and applied research. [2,3] The most recent addition to this vdW family is magnets, which have offered various advantages over conventional magnets and opened new perspectives in vdW heterostructure designs. [4][5][6] In addition to the atomically thin and flat nature of vdW magnets, flexibility, gate tunability, strong proximity interactions, and twist angle between the layers can offer a unique degree of freedom and an innovative platform for device functionalities. [4,5] Recently, several vdW magnets have emerged with the discovery of insulating Cr 2 Ge 2 Te 6 , [7] semiconducting (CrI 3 , [8] CrBr 3 [9] ), and metallic Fe x GeTe 2 . [10,11] The insulating vdW magnets are useful for spin-filter tunneling [9,12] and proximityinduced magnetism, [13][14][15] whereas the metallic magnets can be used as electrodes in magnetic tunnel junctions, [16] observationThe discovery of van der Waals (vdW) magnets opened a new paradigm for condensed matter physics and spintronic technologies. However, the operations of active spintronic devices with vdW ferromagnets are limited to cryogenic temperatures, inhibiting their broader practical applications. Here, the robust room-temperature operation of lateral spin-valve devices using the vdW itinerant ferromagnet Fe 5 GeTe 2 in heterostructures with graphene is demonstrated. The room-temperature spintronic properties of Fe 5 GeTe 2 are measured at the interface with graphene with a negative spin polarization. Lateral spin-valve and spin-precession measurements provide unique insights by probing the Fe 5 GeTe 2 /graphene interface spintronic properties via spin-dynamics measurements, revealing multidirectional spin polarization. Density functional theory calculations in conjunction with Monte Carlo simulations reveal significantly canted Fe magnetic moments in Fe 5 GeTe 2 along with the presence of negative spin polarization at the Fe 5 GeTe 2 / graphene interface. These findings open opportunities for vdW interface design and applications of vdW-magnet-based spintronic devices at ambient temperatures.

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Section: Introductionmentioning

confidence: 99%

A Room‐Temperature Spin‐Valve with van der Waals Ferromagnet Fe₅GeTe₂/Graphene Heterostructure

et al. 2023

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“…We introduce a RINE system that exploits the thermal nonequilibrium between its color and mid-infrared emission parts for full-color sub-ambient cooling. The system in part is similar to previous novel radiative cooler designs that utilize a wavelength filter on top of a thermal emitter [34][35][36] or that place an IR-transparent solar panel above a vacuum-insulated thermal emitter. [37] However, previous approaches did not explicitly consider diverse color expression.…”

Section: Rine Systemmentioning

confidence: 99%

Daylong Sub‐Ambient Radiative Cooling with Full‐Color Exterior Based on Thermal Radiation and Solar Decoupling

Jeon

Son

Min

et al. 2022

Advanced Optical Materials

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triple by 2050, [1] which is alarming. Of more concern is that the majority of the cooling systems currently in use rely on electric power generated by fossil fuels, leaving large carbon footprints. To break this vicious cycle, much attention has been paid recently to radiative cooling because it can achieve sub-ambient cooling without using electricity. Its physical principle is based on both the release of radiative heat into extraterrestrial space and near-perfect solar reflection. [2][3][4][5][6][7][8][9] Comprehensive studies have examined such cooling schemes including energy-saving buildings, [10,11] functional textiles, [12,13] and energy harvesting systems. [14,15] In radiative cooling, however, extreme solar-reflecting conditions restrict the visual appearance of cooling surfaces to white, [4][5][6][7]12] ultra-bright, [16][17][18][19] or silvery [2,8] colors. Historically, visual discomfort by dazzling exteriors has been a great issue in building design, [20,21] so several countries legally regulate the use of solar reflective materials in buildings; particularly in Singapore where the solar reflection from glassy materials should be less than 20%. [22] In addition, lack of aesthetics of cooling surfaces may be objectionable in the commercial and social arena [23] despite the advantages of saving energy. Therefore, color diversity in radiative cooling is a practically important problem with no obvious solution.A potential approach is to use thermally optimized spectral absorptance designs, which can suppress the solar thermal load while retaining the same color. [18,19,[24][25][26] Nevertheless, studies have shown that the diminution of solar thermal load via wavelength selection is fundamentally insufficient to realize sub-ambient cooling for the majority of colors. [24,27] A different approach is to scatter light in different directions according to its wavelength. [28] This can achieve a colorful iridescent effect, but is not a viable solution when a consistent color is required or total reflectance is regulated. Yet another approach is photoluminescence, which recycles the absorbed photons for color exhibition rather than converting them to heat. [29][30][31][32] In a recent study, we revealed that sub-ambient cooling is possible for all colors based on the ideal photoluminescent process. [27] While this is also a promising approach, it requires the development of optimal photoluminescent colorants for each target color. It is still not clear whether it is possible to achieve sub-ambient cooling with any color using only currently available materials.In the current study, we present a colored radiative cooling system that can appear in arbitrary exterior colors while cooling Terrestrial radiative cooling is an intriguing way to mitigate the accelerating cooling demands in the residential and commercial sectors by offering zeroenergy cooling. However, the ultra-white or mirror-like appearance of radiative coolers can be visually sterile and raise safety issues when applied to building facades and ve...

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“…Recently, cooling colorless objects have been carried out by controlling the two light bands: increasing solar reflection and mid-IR radiation with various methods [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] .…”

Section: Introductionmentioning

confidence: 99%

Cooling colors below the ambient temperature

Wang¹,

xing²,

shu³

et al. 2023

Preprint

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The colors of objects are generally originated from reflecting desired light in the desired direction and absorbing the undesired light, which will substantially produce heating. Many efforts have been made to focus on cooling the colorful objects. However, a cooling strategy to cool colorful objects beyond a limit of temperature below the ambient temperature while fully preserving the excellent color properties of high saturation and large viewing field is still a great challenge, as it is rather difficult to independently control the four light bands simultaneously: high diffusion of desired light, low absorption of undesired complementary visible light, low absorption of near-IR light, and high emission of mid-IR light. Inspired by Morpho butterflies, we reported here a robust configure consisting of a multilayer, a disorder structure, and a total reflection layer to cool colorful objects to overcome the challenge. Numerical simulations and experimental measurements demonstrated that our configure can cool a class of colorful objects to not only a temperature of around 2 °C below the ambient temperature, but also with ultra-high saturations (100%) and a wide range of viewing angles (±60°), indicating a great potential for energy sustainability of colorful objects such as buildings, vehicles, facilities, and equipment.

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Numerical Prediction of Fugitive Dust Dispersion on Reclaimed Land in Korea

Cited by 116 publications

References 18 publications

A Room‐Temperature Spin‐Valve with van der Waals Ferromagnet Fe₅GeTe₂/Graphene Heterostructure

A Room‐Temperature Spin‐Valve with van der Waals Ferromagnet Fe₅GeTe₂/Graphene Heterostructure

Daylong Sub‐Ambient Radiative Cooling with Full‐Color Exterior Based on Thermal Radiation and Solar Decoupling

Cooling colors below the ambient temperature

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Numerical Prediction of Fugitive Dust Dispersion on Reclaimed Land in Korea

Cited by 116 publications

References 18 publications

A Room‐Temperature Spin‐Valve with van der Waals Ferromagnet Fe5GeTe2/Graphene Heterostructure

A Room‐Temperature Spin‐Valve with van der Waals Ferromagnet Fe5GeTe2/Graphene Heterostructure

Daylong Sub‐Ambient Radiative Cooling with Full‐Color Exterior Based on Thermal Radiation and Solar Decoupling

Cooling colors below the ambient temperature

Contact Info

Product

Resources

About

A Room‐Temperature Spin‐Valve with van der Waals Ferromagnet Fe₅GeTe₂/Graphene Heterostructure

A Room‐Temperature Spin‐Valve with van der Waals Ferromagnet Fe₅GeTe₂/Graphene Heterostructure