91,399 research outputs found
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
Measurement of the ratio of prompt χ c to J / ψ production in pp collisions at √s = 7 TeV
No full textThe prompt production of charmonium χ c and J / ψ states is studied in proton-proton collisions at a centre-of-mass energy of √s = 7 TeV at the Large Hadron Collider. The χ c and J / ψ mesons are identified through their decays χ c → J / ψ γ and J / ψ → μ + μ - using 36 pb - 1 of data collected by the LHCb detector in 2010. The ratio of the prompt production cross-sections for χ c and J / ψ, σ (χ c → J / ψ γ) / σ (J / ψ), is determined as a function of the J / ψ transverse momentum in the range 2 < p T J / ψ < 15 GeV / c. The results are in excellent agreement with next-to-leading order non-relativistic expectations and show a significant discrepancy compared with the colour singlet model prediction at leading order, especially in the low p T J / ψ region
Gated relational stacked denoising autoencoder with localized author embedding for global citation recommendation
No full textCitation recommendation is an effective and efficient way to facilitate authors finding desired references. This paper presents a novel neural network based model, called gated relational probabilistic stacked denoising autoencoder with localized author (GRSLA) embedding, for global citation recommendation task. Our model is comprised of two modules with different neural network architecture. For each citing and cited papers, we use a gated paper embedding module, which is extended from probabilistic stacked denoising autoencoder (PSDAE) by adding gated units, to obtain their paper vectors. The added gated units are able to utilize text information of cited paper to refine the vector representation of citing paper in multiple semantic levels. For an author in papers, we first apply topic model to obtain his/her semantic neighbors, and then use a localized author embedding (LAE) module to excavate author vector representation from semantic and explicit neighbors. Unlike most graph convolutional network (GCN) based methods, the LAE module is able to avoid computing global Laplacian in whole graph by taking limited neighbors. Moreover, the LAE module can also be stacked to absorb more neighbors, which makes our model have high extendibility. Based on the generation process of GRSLA, we also derive a learning algorithm of our model by maximum a posteriori (MAP) estimation. We conduct experiments on the AAN, DBLP and CORD-19 datasets, and the results show that GRSLA model works well than previous global citation recommendation methods
Correlation between soft-magnetic properties and T-x1-T-c in high B-s FeCoSiBPC amorphous alloys
No full textEffects of Co addition on magnetic properties and thermal parameters of high saturation magnetic flux density (B-s) Fe83-xCoxSi2B11P3C1 (x = 0, 5, 10, 15 and 20) amorphous alloys are investigated. The B-s of the Co-doped alloys can be effectively enhanced to 1.74 T from 1.67 T. Curie temperature (T-c) increases greatly and even exceeds the first crystallization temperature (T-x1) with the increase of Co content to x = 20. The soft-magnetic properties of these high B-s alloys deteriorate with the introducing of Co. It is found that soft-magnetic properties correlate strongly to temperature interval between T-c and T-x1 (T-x1-T-c) of the Co-doped high B-s FeSiBPC amorphous alloys. The domain structures are characterized via the Magneto-optical Kerr Microscope in order to demonstrate the importance of large T-x1-T-c on achieving good soft-magnetic properties. (C) 2015 Elsevier B.V. All rights reserved
Letter from Carl T. Hayden to C. H. Gensler, Havasupai Reservation
No full textLetter from Carl T. Hayden to C. H. Gensler, Havasupai Indian Reservation, regarding Hualapai and Cataract Canyons geography
Metal-catalysed C-Het (F, O, S, N) and C-C bond arylation
No full textThe formation of C-aryl bonds has been the focus of intensive research over the last decades for the construction of complex molecules from simple, readily available feedstocks. Traditionally, these strategies involve the coupling of organohalides (I, Br, Cl) with organometallic reagents (Mg, Zn, B, Si, Sn,...) such as Kumada-Corriu, Negishi, Suzuki-Miyaura, Hiyama and Sonogashira cross-couplings. More recently, alternative methods have provided access to these products by reactions with less reactive C-Het (F, O, S, N) and C-C bonds. Compared to traditional methods, the direct cleavage and arylation of these chemical bonds, the essential link in accessible feedstocks, has become increasingly important from the viewpoint of step-economy and functional-group compatibility. This comprehensive review aims to outline the development and advances of this topic, which was organized into (1) C-F bond arylation, (2) C-O bond arylation, (3) C-S bond arylation, (4) C-N bond arylation, and (5) C-C bond arylation. Substantial attention has been paid to the strategies and mechanistic investigations. We hope that this review can trigger chemists to discover more efficient methodologies to access arylation products by cleavage of these C-Het and C-C bonds
Troglocoelotes Li & Zhao & Zhang & Li 2019, gen. n.
No full textGenus Troglocoelotes Z. Zhao & S. Li gen. n. (Figs 1–15) Type species. Troglocoelotes yumiganen sis Z. Zhao & S. Li gen. n. Etymology. The generic name refers to the cave habitat and coelotine spiders. The gender is masculine. Diagnosis. Troglocoelotes is closely related to Guilotes Z. Zhao & S. Li 2018 based on the copulatory organs morphology but can be distinguished by having 3 promarginal and 2 retromarginal teeth (Fig. 1D) vs. with 5–6 promarginal and 5 retromarginal teeth in Guilotes, eyes reduced (Fig. 1A) or absent (Fig. 1B) vs. normal in Guilotes (Fig. 1C); male palp: median apophysis slice-shaped and with a bent tip (Figs 5 B–C, 8B–C, 10B–C, 12B– C) vs. spoon-shaped, cymbium not suddenly narrowing (Figs 5C, 8C, 10C, 12C), conductor without outgrowth, tegulum and bulbus not intumescent as in Guilotes (Figs 5A, 8A, 10A, 12A); epigyne: epigynal teeth located anteriorly (Fig. 1 E–F) or medially (Figs 7A, 9A) vs. posteriorly, spermathecae ellipsoidal, anterior parts specialized, coiled by copulatory ducts, slender and long (Fig. 1 G–H) vs. spermathecae long and heads fused with copulatory ducts. Description. Small to medium sized with a total length between 3.83–9.28. Coloration: carapace and chelicerae brown; abdomen and spinnerets pale; legs yellowish or pale. Prosoma, posterior radial furrows and both sides of fovea, and chelicerae covered with hairs. Chelicerae with 3 promarginal and 2 retromarginal teeth. Eyes reduced or absent. Legs without black annular striations, leg formula 4123. Abdomen covered with hairs, with cardiac pattern in the most species, without any other marks. Spinnerets: the proximal segment is as long as the basal segment. Male palp: patellar apophysis long in the most species (Figs 8 B–C, 12B–C), but short in T. liangensis (Fig. 5 B–C), wide at base in T. tortus (Fig. 10 B–C); VTA wide and short (the tip just over patellar tibia) (Fig. 5 B–C); RTA about 1/2 the length of VTA (Figs 5C, 8C, 10C, 12C); cymbial furrow in most species long (Figs 5C, 8C, 10C), about 1/2 the length of cymbium in T. yumiganensis (Fig. 12C); embolus filiform, beginning at 6 to 7 o’clock position (Figs 5 A–C, 8A–C, 10A–C, 12A–C); conductor simple but in most species with a blunt dorsal apophysis (Figs 8 B–C, 10B–C) and a lamella (Figs 5B, 10B, 12B); median apophysis slice-shaped with bent tip (Figs 5 B–C, 8B–C, 10B–C, 12B–C). Epigyne: atrium small (Figs 3A, 4A, 6A, 7A, 9A, 11A, 13A); epigynal teeth vary in shape but point medially in the most species (Figs 3A, 4A, 6A, 7A, 9A, 13A); hoods absent; copulatory ducts long and semi-transparent with light color, spermathecae ellipsoidal with dark color, anterior parts specialized, coiled by copulatory ducts, slender and long (Figs 3B, 4B, 6B, 7B, 9B, 11B, 13B). Natural history. All species of Troglocoelotes gen. n. were collected from the deep zone of moist and dark caves (Fig. 15). Characteristics like reduced eyes and pale body coloration indicate they are true troglobionts. Distribution. Guizhou and Guangxi, China (Fig. 14). Comments. The relationships of coelotine spiders were recently analyzed using 8 genes from 286 species in 19 genera (Zhao & Li 2017). The molecular topologies supported Troglocoelotes as a new genus and suggested that Guilotes is the sister-group (Fig. 2).Published as part of Li, Bing, Zhao, Zhe, Zhang, Chuntian & Li, Shuqiang, 2019, Troglocoelotes gen. n., a new genus of Coelotinae spiders (Araneae, Agelenidae) from caves in South China, pp. 219-238 in Zootaxa 4554 (1) on pages 220-222, DOI: 10.11646/zootaxa.4554.1.7, http://zenodo.org/record/262352
FIGURE 2 in Three new species of the genus Vappolotes Zhao & Li, 2019 (Araneae, Agelenidae) from southwest China
No full textFIGURE 2. Male palp of Vappolotes longshan sp. n., holotype. A prolateral view B ventral view C retrolateral view. Scale bar: equal for A, B, and C. Abbreviations: AC = anterior conductor; CF = cymbial furrow; DC = dorsal conductor; E = embolus; EB = embolic base; LTA = lateral tibial apophysis; PA = patellar apophysis; PC = posterior conductor; RTA = retrolateral tibial apophysis; ST = subtegulum; T = tegulum; TS = tegulum sclerite.Published as part of Li, Bing, Zhao, Zhe & Li, Shuqiang, 2023, Three new species of the genus Vappolotes Zhao & Li, 2019 (Araneae, Agelenidae) from southwest China, pp. 325-336 in Zootaxa 5270 (2) on page 328, DOI: 10.11646/zootaxa.5270.2.8, http://zenodo.org/record/786501
FIGURE 5 in Three new species of the genus Vappolotes Zhao & Li, 2019 (Araneae, Agelenidae) from southwest China
No full textFIGURE 5. Male palp of Vappolotes hei sp. n., holotype. A prolateral view B ventral view C retrolateral view. Scale bar: equal for A, B, and C. Abbreviations: AC = anterior conductor; CF = cymbial furrow; DC = dorsal conductor; E = embolus; EB = embolic base; LTA = lateral tibial apophysis; PA = patellar apophysis; PC = posterior conductor; RTA = retrolateral tibial apophysis; ST = subtegulum; T = tegulum; TS = tegulum sclerite.Published as part of Li, Bing, Zhao, Zhe & Li, Shuqiang, 2023, Three new species of the genus Vappolotes Zhao & Li, 2019 (Araneae, Agelenidae) from southwest China, pp. 325-336 in Zootaxa 5270 (2) on page 332, DOI: 10.11646/zootaxa.5270.2.8, http://zenodo.org/record/786501
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