45,247 research outputs found
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>SU</mml:mi><mml:mo>(</mml:mo><mml:mi>N</mml:mi><mml:mo>)</mml:mo></mml:mrow></mml:math> fractional quantum Hall effect in topological flat bands
No full textWe study N-component interacting particles (hardcore bosons and fermions) loaded in topological lattice models with SU(N)-invariant interactions based on exact diagonalization and density matrix renormalization group method. By tuning the interplay of interspecies and intraspecies interactions, we demonstrate that a class of SU(N) fractional quantum Hall states can emerge at fractional filling factors ν = N/(N + 1) for bosons [ν = N/(2N + 1) for fermions] in the lowest Chern band, characterized by the nontrivial fractional Hall responses and the fractional charge pumping. Moreover, we establish a topological characterization based on the K matrix and discuss the close relationship to the fractional quantum Hall physics in topological flat bands with Chern number N.School of Natural Sciences and Mathematic
Sheng : the mixed language of Nairobi
No full textThe purpose of this dissertation is to determine whether Sheng, a language spoken in the Eastlands area of Nairobi, Kenya, is a mixed language (incorporating Swahili, English and local vernaculars). The study focuses on the lexicon and morphosyntax, but social factors are examined as well. Three broad research questions are addressed: (1) Does Sheng have a core vocabulary separate from that of Swahili? (2) How do the system morphemes of Sheng compare with those of Swahili? And (3) in what manner does Sheng provide its speakers a new identity?With respect to question one, the core lexicon, like Russenorsk's, Trio-Ndjuka's and Michif's, manifests a nearly fifty-fifty split in Sheng (52% Swahili; 48% other), making it a mixed language lexically.As for question two, the analysis reveals that Sheng has a composite morphosyntax. No object or relative affixes are marked on the verb. Predicate-argument structure from English has provided a null relativizer. The aerial feature imperfective suffix -a(n)g- is preferred 68% of the time. Noun classes show convergence leveling. The marker ma- serves as the generic plural. The diminutive markers, (ka-, to-), constitute a complete non-Swahili subsystem. Consequently, Sheng is also a mixed language morphosyntactically.In reference to question three, a negative correlation exists between competence in Sheng and income and housing. Though the affluent display a negative attitude towardSheng, they agree with the lower socio-economic groups that Sheng has a communicative utility in metropolitan Kenya. A comparison of the usage in the different residential areas establishes that community-wide grammatical norms (i. e., stability) exist in Sheng. Over two decades without institutional support for Swahili provided a niche in which Sheng, a non-standard language variety, flourished and a new urban identity emerged.Eastlanders walk a linguistic tightrope, balancing between the labels mshamba (`rube') and Mswahili (`slick talker'). However, Sheng provides a sociolinguistic embodiment symbolizing what nuances their existence. Over time, speakers formed a new identity group, whose language was initially `off target' (1899-1963) but subsequently became deliberate postcolonially. Finally, the name of the language itself (Sheng < LiSheng < lish-eng < English) results from and is symbolic of this social transformation.Thesis (Ph. D.)Department of Englis
MBER Space-Time Decision Feedback Equalization assisted Multiuser Detection for Multiple Antenna Aided SDMA Systems
No full textThis paper proposes a space-time decision feedback equalization (ST-DFE) assisted multiuser detection (MUD) scheme for multiple receiver antenna aided space division multiple access systems. A minimum bit error rate (MBER) design is invoked for the MUD, which is shown to be capable of improving the achievable bit error rate performance and enhancing the attainable system capacity over that of the standard minimum mean square error (MMSE) design. An adaptive implementation of the MBER ST-DFE assisted MUD is proposed using a stochastic gradient-based least bit error rate algorithm, which is demonstrated to consistently outperform the classical least mean square (LMS) algorithm, while achieving a lower computational complexity than the LMS algorithm for the binary signalling scheme. Our simulation results demonstrate that the MBER ST-DFE assisted MUD is more robust to channel estimation errors as well as to potential error propagation imposed by decision feedback errors, compared to the MMSE ST-DFE assisted MUD. Index Terms—Decision feedback equalizer, minimum bit error rate, minimum mean square error, multiple antennas, multipleinput multiple-output, multiuser detection, space-division multiple access, space-time processing
Flavonoid Composition in the Leaves of Twelve Litsea and Neolitsea Plants
No full textThis study was aimed to study the chemodiversity of flavonoids in the Formosan Litsea and Neolitsea plants. Applications of LC-SPE-NMR and LC/MS hyphenated techniques in analyzing polar constituents from the leaves of . acuminata, L. hypophaea, N. acuminatissima, and N. konishii led to the identification of 13 known flavonoids and one new flavonol dioside, quercetin 3-O(2-O-beta-D-apiofuranosyl)- alpha-L-rhamnopyranoside. The quantity and variety of flavonoid composition in the leaves of 12 Litsea and Neolitsea plants were examined to enable more effective utilization of such bioactive ingredients. Of these, N. acuminatissima was found to contain the most quantity of flavonoids (ca. 0.24%, w/w, leaves)
1ST MEASUREMENT OF GAMMA(D(S)(+)-]MU+NU)/GAMMA(D(S)(+)-]PHI-PI+)
No full textComplete Author List:
ACOSTA D, ATHANAS M, MASEK G, PAAR H, BEAN A, GRONBERG J, KUTSCHKE R, MENARY S, MORRISON RJ, NAKANISHI S, NELSON HN, NELSON TK, RICHMAN JD, RYD A, TAJIMA H, SCHMIDT D, SPERKA D, WITHERELL MS, PROCARIO M, YANG S, BALEST R, CHO K, DAOUDI M, FORD WT, JOHNSON DR, LINGEL K, LOHNER M, RANKIN P, SMITH JG, ALEXANDER JP, BEBEK C, BERKELMAN K, BESSON D, BROWDER TE, CASSEL DG, CHO HA, COFFMAN DM, DRELL PS, EHRLICH R, GALIK RS, GARCIASCIVERES M, GEISER B, GITTELMAN B, GRAY SW, HARTILL DL, HELTSLEY BK, JONES CD, JONES SL, KANDASWAMY J, KATAYAMA N, KIM PC, KREINICK DL, LUDWIG GS, MASUI J, MEVISSEN J, MISTRY NB, NG CR, NORDBERG E, OGG M, PATTERSON JR, PETERSON D, RILEY D, SALMAN S, SAPPER M, WORDEN H, WURTHWEIN F, AVERY P, FREYBERGER A, RODRIGUEZ J, STEPHENS R, YELTON J, CINABRO D, HENDERSON S, KINOSHITA K, LIU T, SAULNIER M, SHEN F, WILSON R, YAMAMOTO H, ONG B, SELEN M, SADOFF AJ, AMMAR R, BALL S, BARINGER P, COPPAGE D, COPTY N, DAVIS R, HANCOCK N, KELLY M, KWAK N, LAM H, KUBOTA Y, LATTERY M, NELSON JK, PATTON S, PERTICONE D, POLING R, SAVINOV V, SCHRENK S, WANG R, ALAM MS, KIM IJ, NEMATI B, ONEILL JJ, SEVERINI H, SUN CR, ZOELLER MM, CRAWFORD G, DAUBENMIER CM, FULTON R, FUJINO D, GAN KK, HONSCHEID K, KAGAN H, KASS R, LEE J, MALCHOW R, MORROW F, SKOVPEN Y, SUNG M, WHITE C, WHITMORE J, WILSON P, BUTLER F, FU X, KALBFLEISCH G, LAMBRECHT M, ROSS WR, SKUBIC P, SNOW J, WANG PL, WOOD M, BORTOLETTO D, BROWN DN, FAST J, MCILWAIN RL, MIAO T, MILLER DH, MODESITT M, SCHAFFNER SF, SHIBATA EI, SHIPSEY IPJ, WANG PN, BATTLE M, ERNST J, KROHA H, ROBERTS S, SPARKS K, THORNDIKE EH, WANG CH, DOMINICK J, SANGHERA S, SHELKOV V, SKWARNICKI T, STROYNOWSKI R, VOLOBOUEV I, ZADOROZHNY P, ARTUSO M, HE D, GOLDBERG M, HORWITZ N, KENNETT R, MONETI GC, MUHEIM F, MUKHIN Y, PLAYFER S, ROZEN Y, STONE S, THULASIDAS M, VASSEUR G, ZHU G, BARTELT J, CSORNA SE, EGYED Z, JAIN V, SHELDON P, AKERIB DS, BARISH B, CHADHA M, CHAN S, COWEN DF, EIGEN G, MILLER JS, OGRADY C, URHEIM J, WEINSTEIN A
"Closing the R&D Gap, Evaluating the Sources of R&D Spending"
No full textBoth spending and tax policies have been implemented in the United States with the goal of stimulating private sector research and development (R&D). Karier questions whether current R&D policy, especially the research and experimentation tax credit, can contribute to closing the gap between nondefense expenditures on R&D in the United States and such expenditures in other countries, such as Japan and Germany. He also explores possible changes to our current R&D policy to make it more effective.
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Identifying idiolect in forensic authorship attribution: an n-gram textbite approach
No full textForensic authorship attribution is concerned with identifying authors of disputed or anonymous documents, which are potentially evidential in legal cases, through the analysis of linguistic clues left behind by writers. The forensic linguist “approaches this problem of questioned authorship from the theoretical position that every native speaker has their own distinct and individual version of the language [. . . ], their own idiolect” (Coulthard, 2004: 31). However, given the diXculty in empirically substantiating a theory of idiolect, there is growing concern in the Veld that it remains too abstract to be of practical use (Kredens, 2002; Grant, 2010; Turell, 2010). Stylistic, corpus, and computational approaches to text, however, are able to identify repeated collocational patterns, or n-grams, two to six word chunks of language, similar to the popular notion of soundbites: small segments of no more than a few seconds of speech that journalists are able to recognise as having news value and which characterise the important moments of talk. The soundbite oUers an intriguing parallel for authorship attribution studies, with the following question arising: looking at any set of texts by any author, is it possible to identify ‘n-gram textbites’, small textual segments that characterise that author’s writing, providing DNA-like chunks of identifying material
FIGURE 6. Pimoa zekogensis n in Three new species of the spider genus Pimoa Chamberlin & Ivie, 1943 (Araneae, Pimoidae) from Qinghai-Tibet Plateau of China
No full textFIGURE 6. Pimoa zekogensis n. sp., male holotype, left palp. A, Ventral view; B, Retrolateral view; C, Ventral view; D, Dorsal view. Scale bars, A–D, 0.2 mm.Published as part of Irfan, Muhammad, Wang, Lu-Yu, Zhao, Jingxia & Zhang, Zhi-Sheng, 2022, Three new species of the spider genus Pimoa Chamberlin & Ivie, 1943 (Araneae, Pimoidae) from Qinghai-Tibet Plateau of China, pp. 318-330 in Zootaxa 5092 (3) on page 326, DOI: 10.11646/zootaxa.5092.3.4, http://zenodo.org/record/588121
FIGURE 1. Pimoa pingwuensis n in Three new species of the spider genus Pimoa Chamberlin & Ivie, 1943 (Araneae, Pimoidae) from Qinghai-Tibet Plateau of China
No full textFIGURE 1. Pimoa pingwuensis n. sp., male holotype, left palp. A, Prolateral view; B, Retrolateral view; C, Ventral view; D, Dorsal view. Scale bars, A–D, 0.2 mm.Published as part of Irfan, Muhammad, Wang, Lu-Yu, Zhao, Jingxia & Zhang, Zhi-Sheng, 2022, Three new species of the spider genus Pimoa Chamberlin & Ivie, 1943 (Araneae, Pimoidae) from Qinghai-Tibet Plateau of China, pp. 318-330 in Zootaxa 5092 (3) on page 322, DOI: 10.11646/zootaxa.5092.3.4, http://zenodo.org/record/588121
Data for: The second member of bacterial UDP-N-acetyl-D-glucosamine:heparosan alpha-1, 4-N-acetyl-D-glucosaminyltransferase superfamily: GaKfiA from Gallibacterium anatis
No full textsupplementary material
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