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Swart, R.,Dobson, R.T. Korean Nuclear Society 2020 Nuclear Engineering and Technology Vol.52 No.2
The investigation into a full-scale 27 m high, by 6 m wide, thermosyphon loop. The simulation model is based on a one-dimensional axially-symmetrical control volume approach, where the loop is divided into a series of discreet control volumes. The three conservation equations, namely, mass, momentum and energy, were applied to these control volumes and solved with an explicit numerical method. The flow is assumed to be quasi-static, implying that the mass-flow rate changes over time. However, at any instant in time the mass-flow rate is constant around the loop. The boussinesq approximation was invoked, and a reasonable correlation between the experimental and theoretical results was obtained. Experimental results are presented and the flow regimes of the working fluid inside the loop identified. The results indicate that a series of such thermosyphon loops can be used as a cavity cooling system and that the one-dimensional theoretical model can predict the internal temperature and mass-flow rate of the thermosyphon loop.
Kumar, Vinod,Prakash, Jai,Singh, Jitendra Pal,Chae, Keun Hwa,Swart, C.,Ntwaeaborwa, O.M.,Swart, H.C.,Dutta, Viresh Elsevier 2017 Colloids and surfaces Biointerfaces Vol.159 No.-
<P><B>Abstract</B></P> <P>The Ag doped ZnO (ZnO:Ag) NPs with a hexagonal wurtzite structure were synthesized by a solution combustion method. X-ray absorption near edge structure (XANES) and X-ray photoelectron spectroscopy (XPS) were used to study the defects, local electronic and atomic structures before and after Ag doping. XPS and XANES studies confirmed the deficiency of concentration of defects in ZnO after Ag doping. The photoluminescence study showed the deep level emission in the orange-red region in addition to the band to band emission. It was also found that the defect related emission of ZnO was decreased with an increasing in Ag concentration. The antibacterial behaviour of ZnO and ZnO:Ag NPs was studied against the gram positive and gram negative bacteria. The role of Ag doping and defects in the ZnO NPs were discussed for the observed antibacterial and photoluminescence behaviour.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ag doped ZnO. </LI> <LI> Antibacterial study. </LI> <LI> XANES and XPS analysis. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Jarvin Mariadhas,Sarojini Jeeva Panchu,Hendrik C. Swart,Daniel Rani Rosaline,Govindasamy Murugadoss,Durai Govindarajan,Soorathep Kheawhom,Savairoyan Stephen Rajkumar Inbanathan,Awais Bokhari,Lai Fatt 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.128 No.-
Dangerous non-biodegradable compounds are released into the environment due to the increased humanpopulation and industrialization. A simple green synthesis approach of novel silver (Ag)-doped copperoxide (CuO) anchored graphene oxide (GO) nanosheets (Ag-CuO@GO) via energy-efficient microwaveheating method has been developed for photocatalytic and antimicrobial applications. Tea extract is usedas a capping and reducing agent. The prepared Ag-CuO@GO nanocomposites (NCs) used for photocatalyticand antimicrobial activities are investigated systematically. The highly crystalline, wellinterconnectedAg-CuO nanoparticles (NPs) over GO provide an enhanced surface area of 24.1 m2/gand an efficient pore diameter of 15.1 nm with more active sites. A reduced optical bandgap (Eg) of1.48 eV obtained for the Ag-CuO@GO NCs, less than that of the bare and Ag-CuO, indicates that it canfunction as an efficient photocatalyst by harvesting solar energy. As demonstrated by the suppressedPL of the ternary Ag-CuO@GO nanocatalysts, additional of Ag and GO can efficiently separate the chargecarriers. Ag-CuO@GO exhibited an 89% increase in the dye removal rate of MB dye and high antimicrobialactivity against S.aureus, E.coli and Candida albicans that that of bare CuO and binary NCs. The synthesizednovel Ag-CuO@GO NCs show promise as potential photocatalysts for the pollutant degradation andantimicrobial activity.
Oh, Se-Kyung,Baek, Jeong-In,Weigand, Karl M,Venselaar, Hanka,Swarts, Herman G P,Park, Seong-Hyun,Hashim Raza, Muhammad,Jung, Da Jung,Choi, Soo-Young,Lee, Sang-Heun,Friedrich, Thomas,Vriend, Gert,Koend Macmillan Publishers Limited 2015 EUROPEAN JOURNAL OF HUMAN GENETICS Vol.23 No.5
<P>Hereditary sensorineural hearing loss is an extremely clinical and genetic heterogeneous disorder in humans. Especially, syndromic hearing loss is subdivided by combinations of various phenotypes, and each subtype is related to different genes. We present a new form of progressive hearing loss with migraine found to be associated with a variant in the ATP1A2 gene. The ATP1A2 gene has been reported as the major genetic cause of familial migraine by several previous studies. A Korean family presenting progressive hearing loss with migraine was ascertained. The affected members did not show any aura or other neurologic symptoms during migraine attacks, indicating on a novel phenotype of syndromic hearing loss. To identify the causative gene, linkage analysis and whole-exome sequencing were performed. A novel missense variant, c.571G>A (p.(Val191Met)), was identified in the ATP1A2 gene that showed co-segregation with the phenotype in the family. In silico studies suggest that this variant causes a change in hydrophobic interactions and thereby slightly destabilize the A-domain of Na+/K+-ATPase. However, functional studies failed to show any effect of the p.(Val191Met) substitution on the catalytic rate of this enzyme. We describe a new phenotype of progressive hearing loss with migraine associated with a variant in the ATP1A2 gene. This study suggests that a variant in Na+/K+-ATPase can be involved in both migraine and hearing loss.</P>
Global Perspectives on Democracy and Public Stadium Finance
Timothy Kellison,Michael P. Sam,Sungil Hong,Kamilla Swart,Michael J. Mondell 글로벌지식마케팅경영학회 2020 Journal of Global Sport Management Vol.5 No.4
Arenas, ballparks, and stadiums built for professional sports teams or mega-events all around the world often come with large public costs. In democratic states, citizens are assumed to have a role in public policymaking, but previous research suggests the strength of this role can vary case-to-case. To examine the incidence of public stadium finance and public participation across the geopolitical landscape, a collective case study was employed and organized into regime type (i.e., full democracies, flawed democracies, hybrid regimes, authoritarian regimes). The results of the study show clear contrasts in the financing mechanisms within and between regime types. Additionally, each case-study grouping contained examples of citizen-led public participation, though the efficacy of these democratic actions is questionable. This review complements the growing literature on public policy and stadium finance by assessing public engagement in current stadium-subsidy debates around the world.
Luminescence investigations on LiAl_5O_8:Tb^3+ nanocrystalline phosphors
Shreyas S. Pitale,Vinay Kumar,Indrajit Nagpure,O.M. Ntwaeaborwa,H.C. Swart 한국물리학회 2011 Current Applied Physics Vol.11 No.3
Tb^3+-doped porous LiAl_5O_8 nanophosphors were successfully synthesized using a single step combustion method. Structural characterization of the luminescent material was carried out with X-ray diffraction (XRD) analysis and high resolution transmission electron microscopy (HRTEM). Surface composition was estimated from X-ray photoelectron and Auger spectroscopic techniques. The average particle size was estimated as 37 ± 3 nm. Luminescence properties were studied by the photoluminescence spectroscopy. The phosphor showed intense luminescence in the green region due to the magnetic dipole transition of 5^D_4→7^F_5 of the Tb^3+ ion at 543 nm under 241 nm excitation. The intense 4f―4f transitions of Tb^3+outshine the luminescence from host which would otherwise deteriorate the color quality of the display device under operation.
L. Reddy,T.J. Nkosi,P.L. Masiteng,A. Balakrishna,H.C. Swart,O.M. Ntwaeaborwa 한국물리학회 2020 Current Applied Physics Vol.20 No.5
Ca3(PO4)2:1mol%Ce3+/xGd3+ (where x = 0.5, 1.0, 3.0 and 5.0 mol%) phosphors were synthesized by the conventional combustion synthesis method. The X-ray diffraction patterns showed their rhombohedral structure with space group of R3c. The optical properties including reflectance, excitation and emission were investigated. The band gaps of the phosphors were calculated from diffuse reflectance spectra data using the Kubelka–Munk function. The photoluminescence (PL) excitation spectra exhibited the broadband 4f–5d transition of Ce3+ ions centered at ~265 nm. The PL emission properties of the Ca3(PO4)2:Ce3+/Gd3+ phosphors were studied as a function of the Gd3+ ion concentration. The Ca3(PO4)2:Ce3+/Gd3+ phosphor had a wide emission band ranging from 320 to 400 nm, and peaking at 365 nm. This emission is ascribed to the transition from the higher 5d band to 2F7/2, 2F5/2 states of the Ce3+ ion. The 365 nm peak shifted to longer wavelengths with increasing concentration of the Gd3+ ion. The CIE chromaticity diagram of Ca3(PO4)2:Ce3+/Gd3+ phosphor showed tunable emission colour from violet to violet-blue, suggesting that this phosphor can act as a source of violet-blue colour for application in information displays, phototherapy and photoluminescent liquid crystal displays.