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Now showing items 97 - 112 of 86129

  • Cyclic symmetries of A(n)-quiver representations

    Nadler, David  

    This note contains a combinatorial construction of symmetries arising in symplectic geometry (partially wrapped or infinitesimal Fukaya categories), algebraic geometry (derived categories of singularities), and K-theory (Waldhausen's S-construction). Our specific motivation (in the spirit of expectations of Kontsevich) is a combinatorial construction of categorical quantizations of Lagrangian skeleta of symplectic manifolds. The main result of this paper gives an immediate solution in the one-dimensional case of ribbon graphs. (C) 2014 Elsevier Inc. All rights reserved.
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  • A converse theorem for GL(n)

    Andrew R. Booker   M. Krishnamurthy  

    Abstract We complete the work of Cogdell and Piatetski-Shapiro [3] to prove, for n ≥ 3 , a converse theorem for automorphic representations of GL n over a number field, with analytic data from twists by unramified representations of GL n − 1 .
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  • A straightforward green synthesis of N-(tert-butylsulfinyl)imines

    Lv, Xirui   Zhou, Yue   Zhang, Anguo   Zhou, Lihong   Zeng, Qingle  

    A straightforward and environment-friendly protocol for the synthesis of valuable chiral N-(tert-butylsulfinyl)imines has been developed. Different from traditional process with benzaldehydes as substrates, arylmethyl alcohols, benzylthiol, dibenzyl ether, thioether, and disulfide are used as alternative substrates to react with tert-butanesulfinamide in the presence of (KOBu)-Bu-t under air for the synthesis of chiral N-(tert-butylsulfinyl)imines. This is a transition metal-free, mild, cost-effective, and simple process.
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  • In a box: a narrative of a/n (under)grounded Iranian musician

    Nasim Niknafs  

    Due to years of precarious sociopolitical circumstances before and after the 1979 revolution, Iranian youth developed an acute sense of music making and learning unique to their locales, representing their deep-rooted desire to make their own music, and to move away from the state’s heavy-handed intrusion into their act of music making, and years of continuous religious/national identity crisis. Through narrative inquiry, the current research examines the life stories of Raam, an underground rock musician, who started his musical career unofficially in Iran with the assistance of his peers and family members, but later left the country to pursue his musicianship officially and outside the imposed regulations. During these years, Raam, along with fellow Iranian musicians, created an underground music scene that followed the sentiments of anarchism, do-it-yourself, and the Temporary Autonomous Zone (TAZ). This scene became one of Iran’s core music learning and teaching platforms where creativity, collaboration, and sense of camaraderie set the tone for the movement, striving for change and self-expression. Through Raam’s life stories, one can read the story of a generation of Iranian youths’ inevitable political music education; one in which local activism is of great significance, and hides small but steady acts of subversion.
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  • A Faber–Krahn Inequality for the Cheeger Constant of $$N$$ N -gons

    Bucur, Dorin   Fragalà, Ilaria  

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  • [N[N]] compounds in Russian: A growing family of constructions

    Kapatsinski, Vsevolod; Vakareliyska, Cynthia  

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  • ON CONGRUENCES OF THE FORM σ(n) ≡ a (mod n)

    ANAVI, ARIA   POLLACK, PAUL   POMERANCE, CARL  

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  • Constructing a Gene Team Tree in Almost O (n lg n) Time.

    Wang, Biing-Feng   Lin, Chien-Hsin   Yang, I-Tse  

    An important model of a conserved gene cluster is called the gene team model, in which a chromosome is defined to be a permutation of distinct genes and a gene team is defined to be a set of genes that appear in two or more species, with the distance between adjacent genes in the team for each chromosome always no more than a certain threshold delta. A gene team tree is a succinct way to represent all gene teams for every possible value of delta. The previous fastest algorithm for constructing a gene team tree of two chromosomes requires O(n lg n lglg n) time, which was given by Wang and Lin. Its bottleneck is a problem called the maximum-gap problem. In this paper, by presenting an improved algorithm for the maximum-gap problem, we reduce the upper bound of the gene team tree problem to O(n lg n alpha(n)). Since alpha grows extremely slowly, this result is almost as efficient as the current best upper bound, O(n lg n), for finding the gene teams of a fixed delta value. Our new algorithm is very efficient from both the theoretical and practical points of view. Wang and Lin's gene-team-tree algorithm can be extended to k chromosomes with complexity O(kn lg n lglg n). Similarly, our improved algorithm for the maximum-gap problem reduces this running time to O(kn lg n alpha(n)). In addition, it also provides new upper bounds for the gene team tree problem on general sequences, in which multiple copies of the same gene are allowed. =20
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  • SUN-381 GLOMERULAR AREA Ä°N PRÄ°MARY GLOMERULAR DÄ°SEASES

    Turgut, D.; Colak, A.; Koksal Cevher, S.; Coskun Yenigun, E.; Dede, F.  

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  • YTH Domain: A Family of N 6 -methyladenosine (m 6 A) Readers

    Liao, Shanhui   Sun, Hongbin   Xu, Chao  

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  • Toy unboxing: living in a(n unregulated) material world

    Craig, David; Cunningham, Stuart  

    The phenomenon of toy unboxing describes rapidly scaling and commercialising videos featuring the opening, assembling and demonstration of children's toys, often by children, across social media platforms. This phenomenon has fostered concerns by parents and advocates around children's access to and participation in social media. This article provides a brief history of this phenomenon, noting the very limited scholarship on the issue while engaging with the new regulatory questions it provokes. We describe how these videos represent forms of creator labour and operate within the structural and material interests of social media entertainment (SME). SME refers to a proto-industry featuring professionalising-amateur content creators engaging in content innovation and media entrepreneurship across multiple social media platforms to aggregate global fan communities and incubate their own media brands. Our analysis accounts for how unboxing videos work for children both as agents and as small businesses and provides pointers to more nuanced regulatory approaches.
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  • Is N,N-dimethylglycine N-oxide a choline and betaine metabolite?

    Lever, Michael   McEntyre, Christopher J.   George, Peter M.   Chambers, Stephen T.  

    Choline metabolism is by oxidation to betaine, which is demethylated to N,N-dimethylglycine; dimethylglycine is oxidatively demethylated to sarcosine. This pathway is important for osmoregulation and as a source of methyl groups. We asked whether another metabolite was involved. We synthesized the N-oxide of dimethylglycine (DMGO) by oxidizing dimethylglycine with peracetic acid, and measured DMGO in human plasma and urine by HPLC-MS/MS with positive ion detection, using two chromatography procedures, based on ion exchange and HILIC separations. The molecular ion DMGOH(+) (m/z =3D 120) yielded four significant fragments (m/z =3D 103, 102, 58 and 42). The suspected DMGO peak in human body fluids showed all these fragments, and co-chromatographed with added standard DMGO in both HPLC systems. Typical plasma concentrations of DMGO are under 1 mu mol/l. They may be lower in metabolic syndrome patients. Urine concentrations are higher, and DMGO has a higher fractional clearance than dimethylglycine, betaine and choline. It was present in all of over 80 human urine and plasma samples assayed. Plasma DMGO concentrations correlate with plasma DMG concentrations, with betaine and choline concentrations, with the osmolyte myo-inositol, and strongly with urinary DMGO excretion. We conclude that DMGO is probably a normal human metabolite.
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  • A comparative study of small 3d-metal oxide (FeO)n, (CoO)n, and (NiO)n clusters

    Gutsev, G. L.   Belay, Kalayu G   Ramachandran, Bala Ramu   Gutsev, Lavrenty G   Bozhenko, K. V.  

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  • Control of a Driftless Bilinear Vector Field on $n$-Sphere

    Muralidharan, Vijay   Mahindrakar, Arun D.   Saradagi, Akshit  

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  • Albertyn lewer ’n onskatbare bydrae tot die Afrikaanse drama

    Krüger, Lida  

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  • COCOMPACT LATTICES ON (A)over-tilde(n) BUILDINGS

    Capdeboscq, Inna   Rumynin, Dmitriy   Thomas, Anne  

    We construct cocompact lattices Gamma(')(0) < Gamma(0) in the group G =3D PGL(d)(F-q((t))) which are type-preserving and act transitively on the set of vertices of each type in the building Delta associated to G. These lattices are commensurable with the lattices of Cartwright-Steger Isr. J. Math. 103 (1998), 125-140. The stabiliser of each vertex in Gamma(')(0) is a Singer cycle and the stabiliser of each vertex in Gamma(0) is isomorphic to the normaliser of a Singer cycle in PGL(d)(q). We show that the intersections of Gamma(')(0) and Gamma(0) with PSLd(Fq((t))) are lattices in PSLd (F-q((t))), and identify the pairs (d, q) such that the entire lattice Gamma(')(0) or Gamma(0) is contained in PSLd(F-q((t))). Finally we discuss minimality of covolumes of cocompact lattices in SL3(F-q((t))). Our proofs combine the construction of Cartwright-Steger Isr. J. Math. 103 (1998), 125-140 with results about Singer cycles and their normalisers, and geometric arguments.
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