1,041 research outputs found
Analysis of power balance in a helicon plasma source
No full textThis thesis analyses the Helicon Injected Inertial Plasma Electrostatic Rocket (HIIPER), a space propulsion concept consisting of a helicon source for plasma generation and an ion extraction method using a nested pair of inertial electrostatic confinement (IEC) grids that are asymmetrically designed. In this study, the HIIPER setup was modelled based on the previous experimental data of the plasma characteristics obtained to account for various power loses and understand the major contributors to the low efficiency and final thrust performance. The loses to the quartz tube wall was substantially higher than the loses at the metal bellow region and the loses due to ionization and excitation. Future improvements in Langmuir probe design to characterize the plasma and the feasible changes to the experimental setup are provided in this study.Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2022-05-01The student, Hariharan Manickam Vaithiyanathan, accepted the attached license on 2020-04-30 at 11:52.The student, Hariharan Manickam Vaithiyanathan, submitted this Thesis for approval on 2020-04-30 at 12:09.This Thesis was approved for publication on 2020-05-12 at 11:33.DSpace SAF Submission Ingestion Package generated from Vireo submission #15126 on 2020-08-25 at 17:28:30Made available in DSpace on 2020-08-26T23:57:20Z (GMT). No. of bitstreams: 2
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Previous issue date: 2020-05-12Embargo set by: Seth Robbins for item 115750
Lift date: 2022-08-26T23:57:28Z
Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD systemEmbargo set by: Seth Robbins for item 115750
Lift date: 2022-08-26T23:58:55Z
Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD systemAuthor requested U of Illinois access only (OA after 2yrs) in Vireo ETD systemU of I Onl
POSS–Tetraalkylammonium Salts: A New Class of Ionic Liquids
No full textA series of new polyhedral oligomeric silsesquioxane ionic
liquids (POSS-ILs) based on the trimethylpropylammonium dielectric constants, which, conversely, display slight differences
originating from the nature of the anions. The long
alkyl-chain substituents on the POSS core infer on this series
of ILs an overall hydrophobic character and solution properties
comparable to those of classic cationic surfactants, resulting
in an effective extractant capability of polyanions
from aqueous solutions. Their solution diffusion properties,
as investigated by room-temperature dynamic light scattering,
solution conductivity, density, and osmometric measurements,
do not provide evidence for the occurrence of any
hepta(isooctyl)octasilsesquioxane cation and a variety of
anions have been synthesized and characterized. Their thermal
behavior has been ascertained by thermogravimetric
and differential thermal analyses and differential scanning
calorimetry; room temperature conductivity, dielectric constants,
and dynamic contact angles have been investigated
as well. The obtained data show that the presence of the
POSS moiety is responsible not only for their thermal properties,
but also for their low room-temperature conductivity and significant self-assembling processes
Role of demographic and psychological factors on vaccine reluctance in Covid-19: A systematic review
No full textToxicity on Dengue Mosquito Vectors Through Myristica fragrans-Synthesized Zinc Oxide Nanorods, and Their Cytotoxic Effects on Liver Cancer Cells (HepG2)
No full textDengue is an arbovirus mainly vectored by Aedes mosquitoes. Its prevention and control depends to effective vector control measures. Cancer causes millions of death every year. Most of the anticancer drugs have high toxicity and low specificity of action, leading to systemic toxicity and severe side effects. Thus, the development of effective tools is a priority. We fabricated zinc oxide nanoparticles using the Myristica fragrans extract as a reducing and stabilizing agent. Nanoparticles were studied using UV–vis spectrophotometry, Fourier transform infrared spectroscopy, X-ray diffraction, zeta potential, dynamic light scattering, energy dispersive X-ray analysis, field emission scanning electron microscopy and transmission electron microscopy. ZnO nanorods were highly effective against A. aegypti young instars, with LC50 ranging from 3.44 (larva I) to 14.63 ppm (pupa). Nanorods showed adult LC50 of 15.004 ppm. ZnO nanorods exhibited dose-dependent cytotoxicity against human hepato-cancer cells (HepG2). After 48 and 24 h of incubation, the IC50 were 20 and 22 μg/ml, respectively. Nanorods triggered the induction of apoptosis. Overall, this study highlights that the possibility to employ M. fragrans-synthesized ZnO nanorods in mosquito control, as well as in the development of novel chemotherapeutic agents with reduced systemic toxicity
Eurydice arabica Jones 1974
No full text<i>Eurydice arabica</i> Jones, 1974 <p>(Fig. 5 a, b)</p> <p> <i>Eurydice arabica</i> Jones 1974: 202, fig. 2a–g.— Bruce 1986: 221.</p> <p> <b>Material examined</b>. 3 females (SMF 40852) low tide, subtidal sand, Bahrain sta. 850805A5, Mashtan Island, coll. D.A. Jones 1985; 1 juv (SMF 40853) subtidal sand, Kuwait, Al-Ahmad Sea City waterways, sta. NS06 coll. B.R. Sontakke 2009.</p> <p> <b>Remarks.</b> This species has been extensively collected in the Red Sea (Jones 1974; Dexter 1986 /7; Dexter 1989) from intertidal sand, but present records from Bahrain and Kuwait are the first for the Arabian Gulf.</p> <p> The appendix masculina and pleotelson posterior margin are figured (Fig. 5 a, b), together with those of <i>E. paxilli</i> (Fig. 5 d, e) and <i>E. inermis</i> (Fig. 5 f) to assist with the identification key.</p>Published as part of <i>Jones, David Alan & Nithyanandan, Manickam, 2012, Taxonomy and distribution of the genus Eurydice Leach, 1815 (Crustacea, Isopoda, Cirolanidae) from the Arabian region, including three new species, pp. 45-57 in Zootaxa 3314</i> on page 55, DOI: <a href="http://zenodo.org/record/210845">10.5281/zenodo.210845</a>
Highly untangled multiwalled carbon nanotube@polyhedral oligomeric silsesquioxane ionic hybrids: Synthesis, characterization and nonlinear optical properties
No full textAbstract Highly de-bundled multiwalled carbon nanotube (MWCNT) polymer nanohybrids were obtained via ionic assembling of a novel POSS-polyimidazolium-ionic liquid (POSS = polyhedral oligomeric silsesquioxanes) with oxidized MWCNTs. The synthesis, accomplished by a simple bilayer chloroform/water metathetical reaction process, was promoted by the high surfactant properties of POSS-imidazolium-polyionic liquid, which assisted the effective de-bundling, dispersion and purification of the as prepared POSS@MWCNT polymers in organic media, via a surface coating mechanism. The presence of remarkably intense radial breathing modes (RBMs) in Raman spectra, both in solution and as solid, corroborates the effectiveness of the de-bundling process induced by the amphiphilic POSS polymeric ionic liquid (polyIL). This was, further, substantiated by scanning and transmission electron microscopy images. The nonlinear optical (NLO) behavior of POSS@MWCNT was investigated by Z-scan technique, which revealed a remarkable susceptibility χ(3) of 2.38·10-7 esu mainly due to a dispersive effect. A good optical limiting (OL) performance, under a 532 nm pulsed excitation, was observed as well
Cheiriphotis Walker 1904
No full textGenus <i>Cheiriphotis</i> Walker, 1904 <p> Syn.: <i>Cheirophotis</i> Walker, 1904</p>Published as part of <i>Al-Kandari, Manal, Polikarpov, Igor, Nithyanandan, Manickam, Al-Yamani, Faiza & Grintsov, Vladimir, 2023, An annotated checklist of the Amphipoda (Crustacea) of Kuwait, north-western Arabian Gulf, pp. 1-36 in Zootaxa 5351 (1)</i> on page 14, DOI: 10.11646/zootaxa.5351.1.1, <a href="http://zenodo.org/record/8391121">http://zenodo.org/record/8391121</a>
Urothoe Dana 1852
No full textGenus <i>Urothoe</i> Dana, 1852d <p> Syn.: <i>Egidia</i> Costa, 1853</p>Published as part of <i>Al-Kandari, Manal, Polikarpov, Igor, Nithyanandan, Manickam, Al-Yamani, Faiza & Grintsov, Vladimir, 2023, An annotated checklist of the Amphipoda (Crustacea) of Kuwait, north-western Arabian Gulf, pp. 1-36 in Zootaxa 5351 (1)</i> on page 25, DOI: 10.11646/zootaxa.5351.1.1, <a href="http://zenodo.org/record/8391121">http://zenodo.org/record/8391121</a>
Bemlos Shoemaker 1925
No full textGenus <i>Bemlos</i> Shoemaker, 1925 <p> Syn.: <i>Lembopsis</i> Pearse, 1912</p>Published as part of <i>Al-Kandari, Manal, Polikarpov, Igor, Nithyanandan, Manickam, Al-Yamani, Faiza & Grintsov, Vladimir, 2023, An annotated checklist of the Amphipoda (Crustacea) of Kuwait, north-western Arabian Gulf, pp. 1-36 in Zootaxa 5351 (1)</i> on page 12, DOI: 10.11646/zootaxa.5351.1.1, <a href="http://zenodo.org/record/8391121">http://zenodo.org/record/8391121</a>
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