112,749 research outputs found
Prosopistoma someshwarensis Ramya Roopa, Selvakumar & Subramanian, n. sp.
No full textProsopistoma someshwarensis Ramya Roopa, Selvakumar & Subramanian n. sp. Figs. 2–12 Material examined. Holotype: mature larva, INDIA, Karnataka, Someshwara Wildlife Sanctuary, Seethanadi river, Dulli Hole, 13°28’49.82’’ N, 075°02’43.77’’ E, 91 m, 04.III.2016, Coll. S. Ramya Roopa [ZSISRC-I/E 19]. Paratypes: 2 mature larvae, same data as holotype [ZSISRC-I/E 20]; 15 mature larvae, INDIA, Karnataka, Someshwara Wildlife Sanctuary, Seethanadi river, Yele Hole, 13°32’18.48’’ N, 075°04’43.14’’ E, 676 m, 06.VI.2015, 28.XII.2015, 17.III.2016, Coll. S. Ramya Roopa; 3 mature larvae, INDIA, Karnataka, Someshwara Wildlife Sanctuary, Seethanadi river, Onakeabbi falls, 13°30’46.41’’ N, 075°04’31.04’’ E, 597 m, 01.VI.2015, Coll. S. Ramya Roopa; 3 mature larvae, INDIA, Karnataka, Someshwara Wildlife Sanctuary, Seethanadi river, Onakeabbi falls, 13°30’27.07’’ N, 075°05’17.06’’ E, 655 m, 25.XI.2015, Coll. S. Ramya Roopa. Description. Mature larva. Body length 4–4.5 mm excluding caudal filaments. Head uniformly reddish brown with median ocellus between antennae, width approximately 2.5 times length. Epicranial sutures clearly visible, passing through lateral ocelli and anterior margin of compound eyes, continuing to lateral margin of head (Fig. 2 A). Carapace general coloration reddish brown, with one pale-coloured circular depression on each side of midline of anterior region of carapace, present at approximately 0.26 times length of carapace from posterior margin of head (Fig. 2 B) and with many dark ridges including few ridges resembling longitudinal lines on surface (Fig. 2 C). Head. Antenna (Fig. 4) 7-segmented including scape and pedicel, longer than distance from antennal base to anterior margin of head; segment III longest and shorter than combined length of segments IV–VII. Labrum (Fig. 6) prominent when larva viewed dorsally, narrow, approximately 3.7 times wider than long, anterior margin fringed with dense fine setae. Left and right mandibles similar. Outer canine of mandibles longer and broader than inner canine, with three apical teeth, outer tooth small, inner tooth larger with margin serrated near apex with 4–5 small spines; inner canine with two apical teeth, inner one slightly larger, inner margin serrated near apex with 3–5 spines. 8–10 long serrated bristles arising from base of inner canine. Single stout, feathered seta present lateromedially on each mandible (Fig. 5). Maxillae (Fig. 7) crowned by rigid canine and three subequal moveable dentisetae; three long feathered, stout bristles arising near base of apical canine and dentisetae on galea-lacinia. Single unserrated bristle arising about two-thirds of way down sclerotized section of galea-lacinia. Length ratio of maxillary palp segments from basal one to apical one: 1.9:3.2:1. Labial palpi 3-segmented, length ratio of labial palp segments from basal one to apical one: 2:1.65:1 (Fig. 8). Legs. Dorsal margin of fore femur with 20 or 21 simple, short, feathery setae; ventral margin of fore tibia with 14 or 15 pectinate setae (Fig. 9). Tarsal claws of all three pairs of legs without denticles. Abdomen. Abdominal gills I–VI. Gill I large and branched (Fig. 10). Gill II broad, leaf-like and unbranched (Fig. 11). Gills III–V with multiple branching filaments (Fig. 12). Gill VI tiny, unbranched. Posterolateral projections of abdominal segments VII–IX broad, apex pointed (Figs. 2 & 3). Three retractile, short and feathery caudal filaments present. Sub-imago and Imago. Unknown. Distribution. India (Central Western Ghats). Etymology. This species is named after the place of collection, Someshwara Wildlife Sanctuary, Karnataka, India. Diagnosis. Prosopistoma someshwarensis n. sp. is most similar to P. alaini Bojková & Soldán 2015, a recently described species from Algeria (Bojková & Soldán 2015). However, P. someshwarensis n. sp. can be distinguished from all other species of Prosopistoma, including P. alaini, by the following combination of characters: (i) antenna 7-segmented including scape and pedicel; segment III the longest and shorter than combined length of segments IV–VII (Fig. 4); (ii) epicranial sutures clearly visible, passing through anterior margin of lateral ocelli and between compound eyes and antennal bases or through lateral ocelli and anterior margin of compound eyes, continuing to lateral margin of head (Fig. 2 A); (iii) carapace general coloration reddish brown, with one pale-coloured circular depression on each side of midline of anterior region of carapace (Fig. 2 B) and with few longitudinal line that looks like a ridge on its surface (Fig. 2 C); (iv) 8–10 long serrated bristles arising from the base of inner canine (Fig. 5); (v) ventral margin of fore-tibia with 14–15 pectinate setae (Fig. 9) and (vi) postero-lateral projections on abdominal segments VII–IX broad and apex pointed (Figs. 2 & 3). Ecology. The new species was collected from riffle habitat, underneath cobbles and gravel, in tributaries of the Seethanadi River, a west-flowing river in the central Western Ghats. The sampling sites were all located within tropical wet evergreen forests. The streams (Dulli Hole, Yele Hole and Onakeabbi falls) had average widths ranging from 0.92 m to 9.86 m and average depths ranging from 0.90 cm to 12.24 cm through the three seasons of sampling. The pH ranged from 6.26 to 8.48 and water temperature ranged from 20.8°C to 28.8°C.Published as part of Roopa, S. Ramya, Selvakumar, C., Subramanian, K. A. & Sivaramakrishnan, K. G., 2017, A new species of Prosopistoma Latreille, 1833 and redescription of P. indicum Peters, 1967 (Ephemeroptera: Prosopistomatidae) from the Western Ghats, India, pp. 591-599 in Zootaxa 4242 (3) on pages 593-595, DOI: 10.11646/zootaxa.4242.3.10, http://zenodo.org/record/37698
Sum of Products of Read-Once Formulas
No full textWe study limitations of polynomials computed by depth two circuits built over read-once formulas (ROFs). In particular,
1. We prove an exponential lower bound for the sum of ROFs computing the 2n-variate polynomial in VP defined by Raz and Yehudayoff [CC,2009].
2. We obtain an exponential lower bound on the size of arithmetic circuits computing sum of products of restricted ROFs of unbounded depth computing the permanent of an n by n matrix. The restriction is on the number of variables with + gates as a parent in a proper sub formula of the ROF to be bounded by sqrt(n). Additionally, we restrict the product fan in to be bounded by a sub linear function. This proves an exponential lower bound for a subclass of possibly non-multilinear formulas of unbounded depth computing the permanent polynomial.
3. We also show an exponential lower bound for the above model against a polynomial in VP.
4. Finally we observe that the techniques developed yield an exponential lower bound on the size of sums of products of syntactically multilinear arithmetic circuits computing a product of variable disjoint linear forms where the bottom sum gate and product gates at the second level have fan in bounded by a sub linear function.
Our proof techniques are built on the measure developed by Kumar et al.[ICALP 2013] and are based on a non-trivial analysis of ROFs under random partitions. Further, our results exhibit strengths and provide more insight into the lower bound techniques introduced by Raz [STOC 2004]
Lower Bounds for Multilinear Order-Restricted ABPs
No full textProving super-polynomial lower bounds on the size of syntactic multilinear Algebraic Branching Programs (smABPs) computing an explicit polynomial is a challenging problem in Algebraic Complexity Theory. The order in which variables in {x_1,...,x_n} appear along any source to sink path in an smABP can be viewed as a permutation in S_n. In this article, we consider the following special classes of smABPs where the order of occurrence of variables along a source to sink path is restricted:
1) Strict circular-interval ABPs: For every sub-program the index set of variables occurring in it is contained in some circular interval of {1,..., n}.
2) L-ordered ABPs: There is a set of L permutations (orders) of variables such that every source to sink path in the smABP reads variables in one of these L orders, where L 0.
We prove exponential (i.e., 2^{Omega(n^delta)}, delta>0) lower bounds on the size of above models computing an explicit multilinear 2n-variate polynomial in VP.
As a main ingredient in our lower bounds, we show that any polynomial that can be computed by an smABP of size S, can be written as a sum of O(S) many multilinear polynomials where each summand is a product of two polynomials in at most 2n/3 variables, computable by smABPs. As a corollary, we show that any size S syntactic multilinear ABP can be transformed into a size S^{O(sqrt{n})} depth four syntactic multilinear Sigma Pi Sigma Pi circuit where the bottom Sigma gates compute polynomials on at most O(sqrt{n}) variables.
Finally, we compare the above models with other standard models for computing multilinear polynomials
author-bios-SRD-19-0063.R1 – Supplemental material for The Network Structure of Police Misconduct
No full textSupplemental material, author-bios-SRD-19-0063.R1 for The Network Structure of Police Misconduct by George Wood, Daria Roithmayr and Andrew V. Papachristos in Socius</p
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
On Identity Testing and Noncommutative Rank Computation over the Free Skew Field
No full textThe identity testing of rational formulas (RIT) in the free skew field efficiently reduces to computing the rank of a matrix whose entries are linear polynomials in noncommuting variables [Hrubeš and Wigderson, 2015]. This rank computation problem has deterministic polynomial-time white-box algorithms [Ankit Garg et al., 2016; Ivanyos et al., 2018] and a randomized polynomial-time algorithm in the black-box setting [Harm Derksen and Visu Makam, 2017]. In this paper, we propose a new approach for efficient derandomization of black-box RIT. Additionally, we obtain results for matrix rank computation over the free skew field and construct efficient linear pencil representations for a new class of rational expressions. More precisely, we show:
- Under the hardness assumption that the ABP (algebraic branching program) complexity of every polynomial identity for the k×k matrix algebra is 2^Ω(k) [Andrej Bogdanov and Hoeteck Wee, 2005], we obtain a subexponential-time black-box RIT algorithm for rational formulas of inversion height almost logarithmic in the size of the formula. This can be seen as the first "hardness implies derandomization" type theorem for rational formulas.
- We show that the noncommutative rank of any matrix over the free skew field whose entries have small linear pencil representations can be computed in deterministic polynomial time. While an efficient rank computation was known for matrices with noncommutative formulas as entries [Ankit Garg et al., 2020], we obtain the first deterministic polynomial-time algorithms for rank computation of matrices whose entries are noncommutative ABPs or rational formulas.
- Motivated by the definition given by Bergman [George M Bergman, 1976], we define a new class of rational functions where a rational function of inversion height at most h is defined as a composition of a noncommutative r-skewed circuit (equivalently an ABP) with inverses of rational functions of this class of inversion height at most h-1 which are also disjoint. We obtain a polynomial-size linear pencil representation for this class which gives a white-box deterministic polynomial-time identity testing algorithm for the class
Variations on the Author
No full text“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
sj-docx-1-trd-10.1177_26330040221133124 – Supplemental material for Building cross-border collaborations to increase diversity and accelerate rare disease drug development – meeting report from the inaugural IndoUSrare Annual Conference 2021
No full textSupplemental material, sj-docx-1-trd-10.1177_26330040221133124 for Building cross-border collaborations to increase diversity and accelerate rare disease drug development – meeting report from the inaugural IndoUSrare Annual Conference 2021 by Harvinder Kour Khera, Nisha Venugopal, Ramya T. Karur, Rakesh Mishra, Reena V. Kartha and Harsha K. Rajasimha in Therapeutic Advances in Rare Disease</p
Durgades aviana Viraktamath
No full textDurgades aviana Viraktamath (Figs. 3,7,11,15,37–41) Durgades aviana Viraktamath 2004: 367, Viraktamath 2011: 42 Measurements. Male 4.3 mm long, 1.56 mm wide across eyes, 1.023 mm wide across hind margin of pronotum Material examined: INDIA, 1♂ 9 ♀ Himachal Pradesh: Kinnaur District, Powari (31°31'42"N 78°16'19"E), 14.viii.2017, Sweep net Coll., Ramya, N. 1♂ Sikkim: Lachung, 21.xi.2015, sweep net, N. M. Meshram Coll., 8♂ Uttarakhand: Tehri Garhwal, 12.x.1988, sweep net, V. V. Ramamurthy Coll. (NPC). Remarks: This species was well described by Viraktamath (2011) but there are minor variations in the male genitalia which one can expect in widely distributed species. Photographic illustrations provided here will add to the original description.Published as part of Meshram, Naresh M., Rai, Stuti, Rajgopal, N. N. & Ramya, N., 2018, Two new species of tribe Agalliini (Hemiptera: Cicadellidae: Megophthalminae) with note on intraspecific variations, pp. 442-450 in Zootaxa 4378 (3) on page 445, DOI: 10.11646/zootaxa.4378.3.11, http://zenodo.org/record/116992
Synthesis, characterization, crystal structure and biological studies of silver(I) complexes derived from coumarin-tethered N-heterocyclic carbene ligands
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