803 research outputs found
Lampygnatha ikuoi Pineda & Koike & Barros 2019, sp. nov.
No full textLampygnatha ikuoi sp. nov. (Figs. 5–11) Type Material (3♂♂). Holotype ♂, “ Brazil, São Paulo, Campos do Jordão, Fazenda Lavrinhas, 1900 m a.s.l. 22°43’16.53”S 45°25’27.58”W. Collected with entomological net, 11:00 am~13:00pm, 18.x.1996, R.M. Koike leg. ” // “ Holotype / Lampygnatha ikuoi gen. & sp. nov. / Pineda, Koike & Barros 2019” [red label printed] (MZUEL). Paratypes : 2 ♂, same data as holotype, except 22.x.1997 // “ Paratype / Lampygnatha ikuoi gen. & sp. nov. / Pineda, Koike & Barros 2019” [yellow label printed] (CPCP). Description. Holotype male: Total length, 20.57mm; prothorax length, 3.1mm; prothorax width at its widest point, 8.04mm; elytral length, 14.9mm; humeral width, 7.34mm. Body dorsally has a longitudinal concavity at the middle, delimited by two distinct carinae / costae from head to near the elytral tip (Fig. 5). Coloration. General coloration black and orange matte; head black with rhomboidal macula white; prothorax orange, excluding base and median depression of pronotal disc; elytra black, except costae and epipleurae orange from base to apical ⅓; venter black with abdominal ventrites with longitudinal orange line on each side, ventrites 1–5 with a common white macula decreasing in size from 1 to 5, ventrite 5 with only a small spot. Setae black or orange. Tip of tarsal claws reddish. Head. Strongly excavated medially from vertex to frons; frons moderately pilose with long, black setae; antennae serrate from 4th antennomere; clypeus coarse punctate and glabrous, with anterior emargination exposing the membrane between clypeus and labrum (Fig. 9); labrum small, transverse, with anterior margin bearing a row of rigid setae. Pronotum. 1.9 times wider than long; finely punctate, base rugose; broader than elytra; lateral margins diverging strongly from base in a more or less straight line to a globiform projection about ⅓ from base; anterior and lateral margins with thick, convex border; anterior margin sinuose, in the middle convex and slightly concave at sides of median convexity. Disc mainly concave, with a large square median depression, delimited at sides by two distinct carinae; a shorter but more excavated anterior depression, and two lateral depressions, separated at middle by a distinct carina. Scutellum. Pentagonal, 1.4 times wider than long; excavate on disc; impunctate. Elytra. 1.86 times longer than wide; superficially punctate-rugose, excepting near the scutellum, where roughness is deeper; without striae, each elytron with a single longitudinal costa bearing a row of coarse punctures, extending from near apex to base (reaching basal margin of elytra); apices with two small spines separated by a concave notch. Venter. Prosternal process flat, without anterior prominence; moderately pilose with long, orange setae. Legs with tibiae with a pair of short spurs at the apex. Abdominal ventrites moderately punctate, with fine setae, shorter than those of the prosternal process. Aedeagus. Strongly sclerotised, widened medially; relatively wide, about 2.9 times longer than widest part at middle. Parameres strongly narrowed laterally in apical ⅓, finger-like in apical ⅓ (ventrally), apex slightly notched with sparse punctures and long setae. Median lobe acuminate at apex, ventrally with three longitudinal grooves. Female. Unknown. Intraspecific variation. Total length, 19.81–20.78mm. Except in size, no significant morphological variation has been found. Etymology. The specific name is dedicated to Ikuo Koike, father of the second author, who passed away in 2018. Biology. Adults were observed on leaves or feeding on flowers of Croton alchorneicarpus Croizat (Euphorbiaceae) (Figs. 1, 3, 4). C. alchorneicarpus plants did not exceed 4 meters in height in the study site. Activity was only observed between 11:00am to 13:00pm, probably because the insects are more likely to fly during the heat of the day. Specimens were collected using an entomological net during October, 1996 and October, 1997 in Fazenda Lavrinhas, located in the city of Campos do Jordão, Brazil (see material examined).Published as part of Pineda, Cristian R., Koike, Ricardo M. & Barros, Rafael C., 2019, A new genus and species of Stigmoderini Lacordaire, 1857 (Coleoptera: Buprestidae: Buprestinae) from Southeast Brazil with notes on its hypothesized mimicry complex, pp. 542-550 in Zootaxa 4686 (4) on page 544, DOI: 10.11646/zootaxa.4686.4.4, http://zenodo.org/record/349653
Full runner removal theorem for Ariki-Koike algebras
No full textWe consider the representation theory of the Ariki-Koike algebra, a -deformation of the group algebra of the complex reflection group . We define the addition of a runner full of beads for the abacus display of a multipartition and investigate some combinatorial properties of this operation. We focus our attention on the -decomposition numbers, i.e. the polynomials arising from the Fock space representation of the quantum group . Using Fayers\u27 LLT-type algorithm for Ariki-Koike algebras, we relate -decomposition numbers for different values of for the class of -multiregular multipartitions, by adding a full runner of beads to each component of the abacus displays for the labelling multipartitions.Minor revisions. To appear on the Journal of Algebra. arXiv admin note: text overlap with arXiv:0908.1749 by other author
Branching Functions ofA(1)n−1and Jantzen–Seitz Problem for Ariki–Koike Algebras
No full textAbstractWe study the restrictions of simple modules of Ariki–Koike algebras Hm(v) with set of parametersv=(ζ; ζv0, …, ζvl−1), whereζis annth root of unity, to their subalgebras Hm−j(v). Using a theorem of Ariki and the crystal basis theory of Kashiwara, we relate this problem to the calculation of tensor product multiplicities of highest weight irreductible representations of the affine Lie algebraA(1)n−1. These multiplicities have a combinatorial description in terms of higher level paths or highest-lift multipartitions. This enables us to solve the Jantzen–Seitz problem for Ariki–Koike algebras, that is, to determine which irreducible representations of Hm(v) restrict to irreducible representations of Hm−1(v). From a combinatorial point of view, this problem is identical to that of computing the tensor product of anA(1)n−1-module of levelland one of level 1. We also consider natural generalisations of the Jantzen–Seitz problem corresponding to the product of a levellmodule by a levell′>1 module, and from the commutativity of tensor products, we deduce a remarkable symmetry between the generalised Jantzen–Seitz conditions and the sets of parameters of the Ariki–Koike algebras
Fractal Views: A Fractal-Based Method for Controlling Information Display
No full texting methods; fractals; information visualization; program display; UI theory 1. INTRODUCTION As computer systems evolve, the capability of restoring and managing information increases more and more. At the same time, computer users must view increasing amounts of information through video displays which are physically limited in size. Displaying information 1 effectively is a main concern in many software applications. For example, in visual programming systems[Shu 1988], graphic representations become very complex if the number of visual elements increases. In hypertext 1 The word "information" is used as a structured set of primitive elements which is specific to each application. Author's address: 481 Minor Hall, School of Optometry, University of California, Berkeley, CA 94720-2020. email: [email protected]; (permanent address: Graduate School of Information Systems, University of Electro-Communications, 1--5--1, Chofugaoka, Chofu, Tokyo 182, Japan. email: [email protected]..
Branching functions of A (1) n-1 and Jantzen-Seitz problem for Ariki-Koike algebras
No full textWe study the restrictions of simple modules of Ariki-Koike algebras Hm (v) with set of parameters v = (i; i v0 ; : : : ; i v l\Gamma1 ), where i is an nth root of unity, to their subalgebras Hm\Gammaj (v). Using a theorem of Ariki and the crystal basis theory of Kashiwara, we relate this problem to the calculation of tensor product multiplicities of highest weight irreducible representations of the affine Lie algebra A (1) n\Gamma1 . These multiplicities have a combinatorial description in terms of higher level paths or highest-lift multipartitions. This enables us to solve the Jantzen-Seitz problem for Ariki-Koike algebras, that is, to determine which irreducible representations of Hm (v) restrict to irreducible representations of Hm\Gamma1 (v). From a combinatorial point of view, this problem is identical to that of computing the tensor product of an A (1) n\Gamma1 -module of level l and one of level 1. We also consider natural generalisations of the Jantzen-Seitz problem co..
Representations of Ariki-Koike algebras and Grobner-Shirshov bases
No full textIn this paper, we investigate the structure of Ariki–Koike algebras and their Specht modules using Gröbner–Shirshov basis theory and combinatorics of Young tableaux. For a multipartition , we find a presentation of the Specht module given by generators and relations, and determine its Gröbner–Shirshov pair. As a consequence, we obtain a linear basis of consisting of standard monomials with respect to the Gröbner–Shirshov pair. We show that this monomial basis can be canonically identified with the set of cozy tableaux of shape .The research of the first author was supported by KOSEF Grant # 98-0701-01-5-L and the Young Scientist Award, Korean Academy of Science and Technology
A University Forests lecture for HUSTEP (Hokkaido University Short-Term Exchange Program) on the ancient forest culture of Hokkaido University campus
No full textIntroduction:Hokkaido University campus has been designated a National Archelogical Site (K39 Site and K435 Site)(Yoshiwaki 1986, Kosugi 2003, 2005, 2008). Therefore, there there are many excavations related to ancient vegatation, such as seeds, pollen fossil, wooden tools and charred wood. These excavation allow us to estimate ancient forest vegetation and the wood utilization of ancient people who lived in the area of what is now Hokkaido University campus. Watanabe et al. (2005), the first author, has been identifying the buried ancient woods found at sites on Hokkaido University campus since 2003. The results, including charred wood, have been reported in archeological excavation reports. However, no one has summarized these results in relation to wood identification and pollen fossil analysis, or systematically organized the date concerning the ancient forest culture, i.e., ancient forest vegetation and wood utilization of ancient people who lived in the area of Hokkaido University. To clarify the ancient forest culture is important because it can lead to an understanding of how ancient people managed forests and we may learn from them forest managemanet techniques suitable for the current global climate changes. Hokkaido University Forests has developed a course on "Environmental Science for Biological Resources" as a part of "Hokkaido University Short Term Exchange Program", HUSTEP(Sasa and Koike 2002, Koike et al. 2006, 2007). To introduce "Ancient Forest Culture" of Hokkaido University campus, we created panels that summarize the results of the wood identification and pollen fossil analysis using the accumulated archeological data from excavations on Hokkaido University campus
Ramanujan-Shen's differential equations for Eisenstein series of level 2
No full textRamanujan (1916) and Shen (1999) discovered differential equations for
classical Eisenstein series. Motivated by them, we derive new differential
equations for Eisenstein series of level 2 from the second kind of Jacobi theta
function. This gives a new characterization of a system of differential
equations by Ablowitz-Chakravarty-Hahn (2006), Hahn (2008), Kaneko-Koike
(2003), Maier (2011) and Toh (2011). As application, we show some arithmetic
results on Ramanujan's tau function.Comment: 21 page
Design of soft x-ray varied-line-spacing (VLS) high-dispersion laminar-type grating coated with super-mirror-type (SMT) multilayer for flat-field spectrograph in a region of 2?4 keV
No full textA soft x-ray varied-line-spacing (VLS) laminar-type spherical grating with super-mirror-type (SMT) multilayer was designed for a soft x-ray high resolution flat-field spectrographs in a region of 2?4 keV. Effective groove density of the designed VLS grating is 3,200 lines/mm, and local groove density varies from 2,700 to 3,866 lines/mm. Geometrical imaging property was evaluated by numerical calculations. The resolving power estimated by means of ray tracing was up to ca. 103. For the evaluation of diffraction efficiency, the SMT multilayer structure designed for 3,200 lines/mm in our previous work, M. Koike et al., Rev. Sci. Instrum. 94, 045109 (2023), was employed, and the numerical calculation was performed considering the local groove density of VLS grooves, and local incidence angle being affected by curvature of spherical surface and geometrical relation between the source and incidence point on the grating. The results showed that the SMT coated grating exhibited about one order of magnitude higher diffraction efficiency compared with an Au-coated grating.journal articl
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