67,291 research outputs found
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
Random walk over a hypersphere
No full textIn a recent paper the author had shown that a special case of S. M. Joshi
transform (so named after the author's reverent father) of distributions
(Sba f)(x)=〈f(y), lFl(a0;b0;ixy) lFl(a;b;−2ixy)〉
is a characteristic function of a spherical distribution. Using the methods developed in that paper; the problem of distribution of the distance CD, where C and D are points niformly distributed in a hypersphere, has been discussed in the present paper. The form of characteristic function has also been obtained by the method of projected distribution.
A generalization of Hammersley's result has also been developed. The main purpose of the paper is to show that although the use of characteristic functions, using the method of Bochner, is available in problems of random walk yet distributional S. M. Joshi transform can be used as a natural tool has been proved for the first time in the paper
Measurement of the ratio of branching fractions B(B0→K∗0γ )/B(B0s→φγ ) and the directCP asymmetry inB 0→K∗0γ
No full textThe ratio of branching fractions of the radiative B decays B0→K⁎0γ and B0s→ϕγ has been measured using an integrated luminosity of 1.0 fb−1 of pp collision data collected by the LHCb experiment at a centre-of-mass energy of s√=7TeV. The value obtained is
B(B0→K⁎0γ)B(B0s→ϕγ)=1.23±0.06(stat.)±0.04(syst.)±0.10(fs/fd),
where the first uncertainty is statistical, the second is the experimental systematic uncertainty and the third is associated with the ratio of fragmentation fractions fs/fd. Using the world average value for B(B0→K⁎0γ), the branching fraction B(B0s→ϕγ) is measured to be (3.5±0.4)×10−5.
The direct CP asymmetry in B0→K⁎0γ decays has also been measured with the same data and found to be
ACP(B0→K⁎0γ)=(0.8±1.7(stat.)±0.9(syst.))%.
Both measurements are the most precise to date and are in agreement with the previous experimental results and theoretical expectations
Branching fraction and CP asymmetry of the decays B+→K0Sπ+ and B+→K0SK+
No full textAn analysis of B+ → K0
Sπ+ and B+ → K0
S K+ decays is performed with the LHCb experiment. The pp
collision data used correspond to integrated luminosities of 1 fb−1 and 2 fb−1 collected at centre-ofmass
energies of
√
s = 7 TeV and
√
s = 8 TeV, respectively. The ratio of branching fractions and the
direct CP asymmetries are measured to be B(B+ → K0
S K+
)/B(B+ → K0
Sπ+
) = 0.064 ± 0.009 (stat.) ±
0.004 (syst.), ACP(B+ → K0
Sπ+
) = −0.022 ± 0.025 (stat.) ± 0.010 (syst.) and ACP(B+ → K0
S K+
) =
−0.21 ± 0.14 (stat.) ± 0.01 (syst.). The data sample taken at
√
s = 7 TeV is used to search for
B+
c
→ K0
S K+ decays and results in the upper limit ( fc · B(B+
c
→ K0
S K+
))/( fu · B(B+ → K0
Sπ+
)) <
5.8 × 10−2 at 90% confidence level, where fc and fu denote the hadronisation fractions of a ¯b
quark
into a B+
c or a B+ meson, respectively
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Planaeschna poumai Joshi & Kunte 2017, sp. nov.
No full text<i>Planaeschna poumai</i> sp. nov. <p>(Figs. 3–4)</p> <p> <b>Holotype.</b> ♂ (NCBS-AV 557), collected on the Senapati-Purul road near TNK village, Senapati District, Manipur, India (25.3756N, 94.2318E), 11.X.2016, Shantanu Joshi leg.</p> <p> <b>Paratype.</b> ♂ (NCBS-AV 585) and <b>allotype</b> ♀ (NCBS-AV 568): upstream from Mayangkhang village, Senapati District, Manipur, India (25.2304N, 94.0066E), 14.X.2016, Shantanu Joshi leg.</p> <p> <b>Etymology.</b> This species is named after the Poumai tribe, one of the larger extant Naga tribes in NE India, which predominantly inhabits the Senapati District of Manipur where the specimens were collected. There are no protected areas in this whole district, which makes community forests critical for biodiversity conservation.</p> <p> <b>Description of the holotype</b>. <i>Head</i> (Fig. 3 e). Labrum, labium, anteclypeus, postclypeus and frons yellow; mandibles brown; postclypeus with two faint brown markings; the crest of the frons and vertex black. Eyes dark green, in live specimens with blue in the center; postgenae marked yellow.</p> <p> <i>Thorax</i> (Fig. 3 d,f). Prothorax black, anterior edge of the mesostigmal plate yellow; propimeron greenish yellow. Synthorax with mesokatepisternum and metakatepisternum marked with yellow; dorsal stripes on mesepisternum green, pointing outwards, faintly yellow at the antealar ridge; mesepimeron marked with a greenish yellow stripe, thinner towards the subalar ridge; a triangular spot below subalar ridge on the mesepimeron and a small spot above the subalar ridge; metepimeron almost entirely yellow; both the mesepimeronic and metepimeronic stripes appear darker green towards the dorsal 1/3rd of its length in live specimens. Legs black; coxae and base of the femur marked with reddish brown; femur of the forelegs marked with yellow on the inside about half its length.</p> <p> <i>Wings.</i> Hyaline; triangle 3-celled (2 in left hw); anal loop 6/7-celled; anal triangle 3-celled; antenodals: 19/ 20 in the fw (a short incomplete nervure present on the left fw between the 2nd and 3rd nervures), 14 in the hw; venation denser towards the apices.</p> <p> <i>Abdomen</i> (Fig. 3 a,d,f). Marked with citron-yellow and green; S1 laterally marked with triangular spot pointing anteriorly, dorsal carina with a yellow stripe; S2 dorsally with a yellow stripe disconnected at the transverse carina; PD edge with a horizontal yellow stripe, laterally with bright yellow AL and PL markings separated by the auricle, the AL marking continuing on the lateral side of the auricle; the auricle posteriorly dark brown; S3–S7 with paired MD spots situated anteriorly about 2/3rd the length of each segment; S3–S7 also with AD and PD yellow stripes on the dorsal carina, reaching the MD spots on S3 and S4; the AD marking reduced on S5–S7, more pronounced and broader on S3; S3–S8 with paired anterio-ventral round yellow spots, these spots continuing dorsally connect to the small ML spots on S3–S7 and the base of the supplementary transverse carina; the ventral spots perfectly rounded on S8; S8 and S10 with paired round black ‘depressions’ dorsally, S9 and S10 black.</p> <p> <i>Anal appendages</i> (Fig. 4 a,b,d). Cerci black; paraprocts black, the central groove and ventral area dark yellow. Cerci twice the length of S10, paraprocts about half the length of cerci. Laterally both cerci and the paraprocts are curved upwards, the cerci are broader and curved slightly more upwards caudal 3/5th of its length, pointed at the apex. The apical 2/5th is spatulate divided in the middle by a lateral ridge. <i>Laterally</i>, the base is thinner and the dorsal half is concave. Paraprocts gently curved upwards, the tip conical, pointing upwards. <i>Dorsally</i>, the anterior cerci are thinner, the outer margin is straight for 1/10th the length of cerci, curved inwards thereafter; the apical spine of the cerci is pointed outwards, sharply pointed. Paraprocts triangular, blunt at the apex.</p> <p> <b>Measurements (mm):</b> abdomen (including anal appendages)=38.6, fw=33.9, hw=34.8.</p> <p> <b>Variation in the paratype (Anal appendages: Fig. 4 d).</b> Paratype male is very similar to the holotype. The PD markings on S2 edge without a thin yellow stripe like on the holotype. Triangle 3 or 4 (right hw) celled, anal triangle 3-celled, anal loop 5-celled. Antenodals: 16/ 17 in the fw, 14/ 16 in the hw.</p> <p> <b>Measurements (mm):</b> abdomen (including anal appendages)=38.5, fw=33.2, hw=33.7.</p> <p> <b>Description of the allotype</b> (Fig. 3 b–c, 4c). The specimen was accidentally decapitated while netting, and the head was lost in the stream beneath, hence the head is not described.</p> <p> <i>Thorax</i> (Fig. 3 c). Prothorax dark brown; the apex of the posterior lobe and the middle lobe black. Synthoracic markings very similar to the male; vibrant yellow-green. The propimeron, mesokatepisternum and metakatepisternum bright yellow; the paired dorsal stripes on the mesepisternum curving slightly outwards at the anterior end; antealar edge marked with faint yellow spots; the mesepimeronic stripe broad and slightly angulated, thinner at the dorsal end with a triangular spot right next to it near the subalar edge; another spot directly above the triangular spot above the subalar ridge; metepimeron marked almost entirely with bright yellowish green, ventral margin thinly brown; the mesepimeronic and metepimeronic markings appear more bright yellow towards the ventral half similar to the male. Legs black; coxae marked yellow posteriorly; basal half of the femur marked yellow posteriorly on the forelegs.</p> <p> <i>Wings.</i> Antenodals: 13–14 in the hw, 19 in the fw. Base of the wings tinted yellow and the area near the node faintly yellow. Median space not traversed by any cross-veins. The triangle is made up of four cells in the hw and three cells in the fw. Pterostigma dark brown, spanning a little more than 2 cells.</p> <p> <i>Abdomen</i> (Fig. 3 b,c). S1 laterally marked with a broad yellow stripe, broader posteriorly; dorsally marked with a thin yellow line; S2 yellow laterally, small, brown, rounded marking on both sides resembling the markings in the area posterior to the auricle of males; a dorsal yellow stripe on S2, S3–S7 with yellow ventro-lateral anterior spots, PL longitudinal spots on S3–S5; S3–S7 with thin yellow AD and PD stripes on the carina disconnected at the center where paired triangular MD spots are present, smaller than the male; S8 marked yellow at the posteriordorsal edge; S8, S9 and S10 black, lower half is dark yellow continuing on to the vulvar scale.</p> <p> <i>Ovipositor</i> (Fig. 4 c). Covered with dry mud suggesting that the female had oviposited or attempted to so in muddy waters. The sternite and ovipositor dark-brown; ovipositor and style extend posteriorly till the base of cerci; cerci about the length of S10, pointed at the apex.</p> <p> <b>Measurements (mm):</b> abdomen (including anal appendages)=47, fw=40, hw=42.</p> <p> <b>Diagnosis.</b> The shape of male anal appendages and the abdominal pattern is similar to <i>P. intersedens</i> (Martin, 1909), the only Indian species of this genus. <i>P. poumai</i> differs with respect to the following diagnostic characters: (a) in both sexes the abdominal pattern differs from <i>P. intersedens</i> in that the paired MD spots on S2 are not present, S9 and S10 unmarked with yellow dorsally, and the PD abdominal spots absent or reduced on S3– S10; (b) the lateral ridge divides the apex of cerci in equal proportions, whereas in <i>P. intersedens</i> the portion below the ridge is more expanded; (c) the posterior half of cerci is not as widely expanded as that in <i>P. intersedens</i>; (d) the apical expansion of cerci laterally angled straight, not curved upwards like <i>P. intersedens</i>; and (e) in both sexes of <i>P. intersedens</i> S2 is laterally yellow; but in <i>P. poumai</i> <b>sp. nov.</b> the lateral yellow markings on S2 of both males is broken posterior to the auricle; this lateral yellow stripe in the female is marked with a round brown spot. The reduced abdominal markings distinguish this species from all other <i>Planaeschna</i> species.</p>Published as part of <i>Joshi, Shantanu & Kunte, Krushnamegh, 2017, Two new dragonfly species (Odonata: Anisoptera: Aeshnidae) from north-eastern India, pp. 259-268 in Zootaxa 4300 (2)</i> on pages 263-266, DOI: 10.11646/zootaxa.4300.2.7, <a href="http://zenodo.org/record/838265">http://zenodo.org/record/838265</a>
FIGURE 5 in A new species of Cephalaeschna Selys, 1883 (Odonata: Anisoptera: Aeshnidae) from Neora Valley National Park, West Bengal, India, with notes on C. acanthifrons Joshi & Kunte, 2017 and C. viridifrons (Fraser, 1922)
No full textFIGURE 5: A. Cephalaeschna acanthifrons holotype from Arunachal Pradesh, thorax [Photo by Subhajit Mazumder]; B. Cephalaeschna viridifrons from Neora Valley National Park, West Bengal, India [Photo by the author]; C. C. acanthifrons, face [Photo by Subhajit Mazumder]; D. C. viridifrons from Neora Valley National Park, face [Photo by the author]; E. C. viridifrons from Neora Valley National Park, abdomen dorsal view [Photo by the author]; F. C. acanthifrons holotype, anal appendages [Photo by Shantanu Joshi, NCBS]; G. C. viridifrons from Assam, anal appendages (reproduced from Asahina 1981a); H. C. viridifrons from Nepal, anal appendages (reproduced from Asahina 1981a); I. C. viridifrons from Neora Valley National Park, anal appendages [Photo by the author].Published as part of Dawn, Prosenjit, 2021, A new species of Cephalaeschna Selys, 1883 (Odonata: Anisoptera: Aeshnidae) from Neora Valley National Park, West Bengal, India, with notes on C. acanthifrons Joshi & Kunte, 2017 and C. viridifrons (Fraser, 1922), pp. 371-380 in Zootaxa 4949 (2) on page 378, DOI: 10.11646/zootaxa.4949.2.10, http://zenodo.org/record/463619
Search for B-c(+) decays to two charm mesons
No full textA search for decays of B-c(+) mesons to two charm mesons is performed for the first time using data corresponding to an integrated luminosity of 3.0 fb(-1), collected by the LHCb experiment in pp collisions at centre-of-mass energies of 7 and 8 TeV. The decays considered are B-c(+)-> D-(s)(()*())(+) (D) over bar (()*()0) and Bc(+)-> D-(s)(()*D-)+(()*())(0), which are normalised to high-yield B+-> D-(s)(+)(D) over bar (0)decays. No evidence for a signal is found and limits are set on twelve B-c(+) decay modes. (C) 2018 The Author(s). Published by Elsevier B.V
Planaeschna poumai Joshi & Kunte 2017, sp. nov.
No full textPlanaeschna poumai sp. nov. (Figs. 3–4) Holotype. ♂ (NCBS-AV 557), collected on the Senapati-Purul road near TNK village, Senapati District, Manipur, India (25.3756N, 94.2318E), 11.X.2016, Shantanu Joshi leg. Paratype. ♂ (NCBS-AV 585) and allotype ♀ (NCBS-AV 568): upstream from Mayangkhang village, Senapati District, Manipur, India (25.2304N, 94.0066E), 14.X.2016, Shantanu Joshi leg. Etymology. This species is named after the Poumai tribe, one of the larger extant Naga tribes in NE India, which predominantly inhabits the Senapati District of Manipur where the specimens were collected. There are no protected areas in this whole district, which makes community forests critical for biodiversity conservation. Description of the holotype. Head (Fig. 3 e). Labrum, labium, anteclypeus, postclypeus and frons yellow; mandibles brown; postclypeus with two faint brown markings; the crest of the frons and vertex black. Eyes dark green, in live specimens with blue in the center; postgenae marked yellow. Thorax (Fig. 3 d,f). Prothorax black, anterior edge of the mesostigmal plate yellow; propimeron greenish yellow. Synthorax with mesokatepisternum and metakatepisternum marked with yellow; dorsal stripes on mesepisternum green, pointing outwards, faintly yellow at the antealar ridge; mesepimeron marked with a greenish yellow stripe, thinner towards the subalar ridge; a triangular spot below subalar ridge on the mesepimeron and a small spot above the subalar ridge; metepimeron almost entirely yellow; both the mesepimeronic and metepimeronic stripes appear darker green towards the dorsal 1/3rd of its length in live specimens. Legs black; coxae and base of the femur marked with reddish brown; femur of the forelegs marked with yellow on the inside about half its length. Wings. Hyaline; triangle 3-celled (2 in left hw); anal loop 6/7-celled; anal triangle 3-celled; antenodals: 19/ 20 in the fw (a short incomplete nervure present on the left fw between the 2nd and 3rd nervures), 14 in the hw; venation denser towards the apices. Abdomen (Fig. 3 a,d,f). Marked with citron-yellow and green; S1 laterally marked with triangular spot pointing anteriorly, dorsal carina with a yellow stripe; S2 dorsally with a yellow stripe disconnected at the transverse carina; PD edge with a horizontal yellow stripe, laterally with bright yellow AL and PL markings separated by the auricle, the AL marking continuing on the lateral side of the auricle; the auricle posteriorly dark brown; S3–S7 with paired MD spots situated anteriorly about 2/3rd the length of each segment; S3–S7 also with AD and PD yellow stripes on the dorsal carina, reaching the MD spots on S3 and S4; the AD marking reduced on S5–S7, more pronounced and broader on S3; S3–S8 with paired anterio-ventral round yellow spots, these spots continuing dorsally connect to the small ML spots on S3–S7 and the base of the supplementary transverse carina; the ventral spots perfectly rounded on S8; S8 and S10 with paired round black ‘depressions’ dorsally, S9 and S10 black. Anal appendages (Fig. 4 a,b,d). Cerci black; paraprocts black, the central groove and ventral area dark yellow. Cerci twice the length of S10, paraprocts about half the length of cerci. Laterally both cerci and the paraprocts are curved upwards, the cerci are broader and curved slightly more upwards caudal 3/5th of its length, pointed at the apex. The apical 2/5th is spatulate divided in the middle by a lateral ridge. Laterally, the base is thinner and the dorsal half is concave. Paraprocts gently curved upwards, the tip conical, pointing upwards. Dorsally, the anterior cerci are thinner, the outer margin is straight for 1/10th the length of cerci, curved inwards thereafter; the apical spine of the cerci is pointed outwards, sharply pointed. Paraprocts triangular, blunt at the apex. Measurements (mm): abdomen (including anal appendages)=38.6, fw=33.9, hw=34.8. Variation in the paratype (Anal appendages: Fig. 4 d). Paratype male is very similar to the holotype. The PD markings on S2 edge without a thin yellow stripe like on the holotype. Triangle 3 or 4 (right hw) celled, anal triangle 3-celled, anal loop 5-celled. Antenodals: 16/ 17 in the fw, 14/ 16 in the hw. Measurements (mm): abdomen (including anal appendages)=38.5, fw=33.2, hw=33.7. Description of the allotype (Fig. 3 b–c, 4c). The specimen was accidentally decapitated while netting, and the head was lost in the stream beneath, hence the head is not described. Thorax (Fig. 3 c). Prothorax dark brown; the apex of the posterior lobe and the middle lobe black. Synthoracic markings very similar to the male; vibrant yellow-green. The propimeron, mesokatepisternum and metakatepisternum bright yellow; the paired dorsal stripes on the mesepisternum curving slightly outwards at the anterior end; antealar edge marked with faint yellow spots; the mesepimeronic stripe broad and slightly angulated, thinner at the dorsal end with a triangular spot right next to it near the subalar edge; another spot directly above the triangular spot above the subalar ridge; metepimeron marked almost entirely with bright yellowish green, ventral margin thinly brown; the mesepimeronic and metepimeronic markings appear more bright yellow towards the ventral half similar to the male. Legs black; coxae marked yellow posteriorly; basal half of the femur marked yellow posteriorly on the forelegs. Wings. Antenodals: 13–14 in the hw, 19 in the fw. Base of the wings tinted yellow and the area near the node faintly yellow. Median space not traversed by any cross-veins. The triangle is made up of four cells in the hw and three cells in the fw. Pterostigma dark brown, spanning a little more than 2 cells. Abdomen (Fig. 3 b,c). S1 laterally marked with a broad yellow stripe, broader posteriorly; dorsally marked with a thin yellow line; S2 yellow laterally, small, brown, rounded marking on both sides resembling the markings in the area posterior to the auricle of males; a dorsal yellow stripe on S2, S3–S7 with yellow ventro-lateral anterior spots, PL longitudinal spots on S3–S5; S3–S7 with thin yellow AD and PD stripes on the carina disconnected at the center where paired triangular MD spots are present, smaller than the male; S8 marked yellow at the posteriordorsal edge; S8, S9 and S10 black, lower half is dark yellow continuing on to the vulvar scale. Ovipositor (Fig. 4 c). Covered with dry mud suggesting that the female had oviposited or attempted to so in muddy waters. The sternite and ovipositor dark-brown; ovipositor and style extend posteriorly till the base of cerci; cerci about the length of S10, pointed at the apex. Measurements (mm): abdomen (including anal appendages)=47, fw=40, hw=42. Diagnosis. The shape of male anal appendages and the abdominal pattern is similar to P. intersedens (Martin, 1909), the only Indian species of this genus. P. poumai differs with respect to the following diagnostic characters: (a) in both sexes the abdominal pattern differs from P. intersedens in that the paired MD spots on S2 are not present, S9 and S10 unmarked with yellow dorsally, and the PD abdominal spots absent or reduced on S3– S10; (b) the lateral ridge divides the apex of cerci in equal proportions, whereas in P. intersedens the portion below the ridge is more expanded; (c) the posterior half of cerci is not as widely expanded as that in P. intersedens; (d) the apical expansion of cerci laterally angled straight, not curved upwards like P. intersedens; and (e) in both sexes of P. intersedens S2 is laterally yellow; but in P. poumai sp. nov. the lateral yellow markings on S2 of both males is broken posterior to the auricle; this lateral yellow stripe in the female is marked with a round brown spot. The reduced abdominal markings distinguish this species from all other Planaeschna species.Published as part of Joshi, Shantanu & Kunte, Krushnamegh, 2017, Two new dragonfly species (Odonata: Anisoptera: Aeshnidae) from north-eastern India, pp. 259-268 in Zootaxa 4300 (2) on pages 263-266, DOI: 10.11646/zootaxa.4300.2.7, http://zenodo.org/record/83826
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