17,924 research outputs found
Author response: India and China in Africa: a comparative perspective of the oil industry by Raj Verma
No full textEarlier this month Ian Taylor reviewed India and China in Africa, a new book about Asian engagement in the West African oil industry. Here, the book’s author Raj Verma responds to Taylor’s comments, outlining the rationale and evidence for the framework used in the study. India and China in Africa: A comparative perspective of the oil industry. Raj Verma. London: Routledge. 2017
J. S. Verma
No full textSriram Panchu’s article “A Tribute to J S Verma” (EPW, 11 May 2013) was informative and illuminated the imprint of the late Jagadish Sharan Verma on the Indian judicial system and public life
Aspidophorodon (Aspidophorodon) harvensis Verma 1967
No full textAspidophorodon (Aspidophorodon) harvensis Verma, 1967 Aspidophorodon harvensis Verma, 1967: 507; Eastop & Hille Ris Lambers, 1976: 96; Blackman & Eastop, 1994: 569. Aspidophorodon (Aspidophorodon) harvensis Verma: Remaudière & Remaudière, 1997: 73; Stekolshchikov & Novgorodova, 2010: 44. Specimens examined. Paratype: apterous viviparous female, INDIA: Kashmir (Harven), 14.v. 1964, on Salix sp., coll. K. D. Verma (BMNH). Distribution. India. Host plant. Salix sp. Biology. This species feeds on undersides of leaves of Salix, sitting tightly along the veins (Verma, 1967). The life cycle is unknown.Published as part of Chen, Jing, Zhang, Bin, Zhu, Xichao, Jiang, Liyun & Qiao, Gexia, 2015, Review of the aphid genus Aspidophorodon Verma, 1967 with descriptions of three new species from China (Hemiptera: Aphididae: Aphidinae), pp. 551-576 in Zootaxa 4028 (4) on pages 558-559, DOI: 10.11646/zootaxa.4028.4.6, http://zenodo.org/record/24149
WELFake dataset for fake news detection in text data
No full textWe designed a larger and more generic Word Embedding over Linguistic Features for Fake News Detection (WELFake) dataset of 72,134 news articles with 35,028 real and 37,106 fake news. For this, we merged four popular news datasets (i.e. Kaggle, McIntire, Reuters, BuzzFeed Political) to prevent over-fitting of classifiers and to provide more text data for better ML training.
Dataset contains four columns: Serial number (starting from 0); Title (about the text news heading); Text (about the news content); and Label (0 = fake and 1 = real).
There are 78098 data entries in csv file out of which only 72134 entries are accessed as per the data frame.
This dataset is a part of our ongoing research on "Fake News Prediction on Social Media Website" as a doctoral degree program of Mr. Pawan Kumar Verma and is partially supported by the ARTICONF project funded by the European Union’s Horizon 2020 research and innovation program
A Unified Shell model for Buoyancy-Driven Turbulence
No full textWe construct a unified shell model for stably stratified and convective turbulence. Shell model simulation of stably stratified flow in turbulent regime exhibit Bolgiano-Obukhbov (BO) scaling in which the kinetic energy spectrum varies as . However, simulation of convective turbulence shows Kolmogorov's spectrum. These results are consistent with the direct numerical simulations of Kumar {\em et al.} [Phys. Rev. E {\bf 90}, 023016 (2014)]. We also observe a dual scaling ( and ) for a limited range of parameters in stably stratified flow
Lactarius kanadii Verma K., Mehmood, Uniyal & Sharma Y. P. 2022, sp. nov.
No full textLactarius kanadii Verma K., Mehmood, Uniyal & Sharma Y.P. sp. nov. 2 Figs. 5, 6. Mycobank:— MB842104 GenBank:— OL 691266 (holotype), OL 691518 (Paratype) Diagnosis:—Basidiocarps with greyish brown to dark brown pileus; abundant watery white latex which changes to yellowish orange; globose to subglobose basidiospores with winged ornamentations ≥ 2 μm high. Etymology:—In honor of Dr Kanad Das for his invaluable contribution to the systematics of Russulaceae in the Indian Himalayan Region. Typification:— INDIA. Jammu and Kashmir: Kathua district, Samanamanj, 1750m, N 32 o 42.997ʹ E 075 o 25.931ʹ, 01 August 2020, Komal Verma, LK-011 (CAL 1868, holotype). Description:— Pileus 65–80 mm diam., initially convex, plano-convex at maturity, at times infundibuliform with depressed centre; surface velvety, greyish brown (6F3-4) to dark brown (6F7); margin undulate, decurved. Lamellae 4–5 mm broad, subdecurrent to decurrent, cream white (1A2) to greyish yellow (4B4), staining light brown (5C5) to brownish orange (5D5) after 15–20 minutes, crowded (10–12/cm), edges concolorous, staining yellowish brown (5D8) when damaged; lamellulae plentiful, unevenly distributed, 8–9 lengths. Stipe 60–80 × 10–18 mm, cylindric, slightly tapered towards apex, surface smooth, concolorous with pileus. Context brittle, white to cream white (5D8), staining light orange (6A4–5) on exposure, stuffed in stipe; not staining with FeSO4 and KOH, brownish red (8D7–8) in guaiacol. Latex abundant, watery white (1A1), changing to light orange (6A4–5) or yellowish orange (6A5–6) on lamellae. Taste mild. Odour pleasant. Spore deposit not obtained. Basidiospores 6.8–8.17–9.5 × 6.0–7.8–9.0 μm, (n = 40, Q = 1.01–1.05–1.13), globose to subglobose, ornamentation composed of 1.5–2 μm high, winged, thick ridges and conical warts, short ridges between the larger ridges, forming an incomplete reticulum; plage inamyloid. Basidia 32–48 × 10–17 μm, subclavate, 2- or 4-spored; sterigmata 4.5–6 × 0.3–0.5 μm. Pleurocystidia absent. Pseudocystidia abundant, 7–9 μm diam., emergent up to 17–37 μm, unbranched. Cheilocystidia absent. Gill edges sterile. Cheiloleptocystidia abundant, 27–52 × 5–8 μm, emergent up to 10–25 μm, cylindric to clavate, apices round, with one to two cells at the base. Marginal cells 10–18 × 5–8 μm, cylindric to subclavate, often multiseptate, thin-walled, with brown intracellular pigmentation. Hymenophoral trama composed of abundant lactifers, up to 4–7 μm diam. Pileipellis a trichopalisade, 75–125 μm thick; suprapellis 40–55 μm deep, composed of cylindric to subclavate cells with brown intracellular pigmentation; subpellis 30–50 μm thick, composed of cylindrical to almost rounded cells. Stipitipellis a palisade to a trichopalisade, 38–55 μm thick; hyphae 6–8 μm diam., terminal cells with intracellular brown pigment. Habit and habitat: — Scattered, under Quercus sp. and Pinus roxburghii in subtemperate mixed forest. Additional specimens examined:— INDIA. Jammu and Kashmir, Kathua, Samanamanj, 1749 m, N 32º42.996ʹ E 075º25.931ʹ, 08 August 2020 K. Verma LK-021; Kathua, Garh 1700 m, 10 August 2020, K. Verma, LK-023. Notes:—Phylogenetically, Lactarius fuliginosus (98 % identity for 98–100 % query coverage using BLAST) and Lactarius picinus (98 % identity for 99–100 % query coverage using BLAST) are closest to Lactarius kanadii and these species could be confused in the field due to their similar macromorphology (basidiome shape, colors of pileus and lamellae). However, Lactarius picinus can be differentiated by its fuscous to brownish olive or sepia-coloured pileus, scant white latex which stains the lamellae salmon to reddish brown, slightly smaller, globose to broadly ellipsoid basidiospores, and its association with Picea sp. Lactarius fuliginosus, which is also close to Lactarius kanadii, can be differentiated by its velvety, greyish brown pileus, globose to broadly ellipsoid basidiospores with an almost complete reticulum, a pileipellis as a trichoepithelium, and its occurrence in coniferous and deciduous forests (Heilmann-Clausen et al. 1998, Stubbe & Verbeken 2012). Lactarius atromarginatus can be differentiated from Lactarius kanadii by its marginate lamellae, abundant watery white latex that turns pale lilac and basidiospores with ornamentation forming a complete reticulum (Verbeken & Horak 2000, Lee et al. 2018). In the context of Indian representatives of L. subg. Plinthogalus, Lactarius nodulisporus and L. singeri could be confused with Lactarius kanadii due to the dark colored basidiomes. However, Lactarius nodulisporus can be segregated from Lactarius kanadii by its white latex, adnexed, distant lamellae and presence of nodulose ornamentation on the basidiospores (Uniyal et al. 2018). Lactarius singer differs from Lactarius kanadii in having a strongly rugose pileus with white context that remains unchanged on exposure, a palisadic pileipellis, a stipitipellis as a trichoderm and occurrence with Quercus sp. and Abies sp. (Uniyal et al. 2018).Published as part of Verma, Komal, Mehmood, Tahir, Uniyal, Priyanka & Sharma, Yash Pal, 2022, Lactarius indoevosmus and L. kanadii (Russulaceae), two new species from the northwestern Himalayas, India, inferred from morphology and molecular data, pp. 165-177 in Phytotaxa 541 (2) on pages 172-175, DOI: 10.11646/phytotaxa.541.2.6, http://zenodo.org/record/638874
Sweeping has no effect on renormalized turbulent viscosity
No full textWe perform renormalization group analysis (RG) of the Navier-Stokes equation in the presence of constant mean velocity field , and show that the renormalized viscosity is unaffected by , thus negating the ``sweeping effect", proposed by Kraichnan [Phys. Fluids {\bf 7}, 1723 (1964)] using random Galilean invariance. Using direct numerical simulation, we show that the correlation functions for and differ from each other, but the renormalized viscosity for the two cases are the same. Our numerical results are consistent with the RG calculations
On 2-Verma modules for quantum sl(2)
No full textIn this paper we study the superalgebra An, introduced by the authors in previous work on categorification of Verma modules for quantum sl2. The superalgebra An is akin to the nilHecke algebra, and shares similar properties. We also prove a uniqueness result about 2-Verma modules on k-linear 2-categorie
Fig. 3 in Redescription And New Host Record Of Diplostamenides Sciaenae (Monogenea, Microcotylidae) And Its Phylogenetic Status Using Molecular Markers
No full textFig. 3. Phylogenetic tree topology of parital 28S rRNA nucleotide sequence data for the members of microcotytlidae and outgroup of members of diclidophoridae through NJ and ME methods. The bootstrap values for 1000 replicates are shown as in the phylogram and branch length is genetic distance between taxa.Published as part of Verma, A. K., Verma, J. & Agrawal, N., 2018, Redescription And New Host Record Of Diplostamenides Sciaenae (Monogenea, Microcotylidae) And Its Phylogenetic Status Using Molecular Markers, pp. 37-46 in Vestnik Zoologii 52 (1) on page 43, DOI: 10.2478/vzoo-2018-0005, http://zenodo.org/record/645457
Cobalt-nhc Complexes and Diazabutadienes in Activation of Mono/Diboron Compounds and Their Application in C-b Coupling Reactions
No full textBoronic acid(esters) have been well recognized as an indispensable coupling partner in the Suzuki-Miyaura cross coupling reactions producing a vast spectrum of molecules, applicable in the diverse field ranging from medicinal to materials sciences.[1] Transition metal catalyzed synthesis of boronic esters from diborons with the assistance of bases is a well-established methodology[2]. In this thesis, the cobalt-N-Heterocyclic carbene complexes catalyzed borylation of organic compounds and interaction of diazabutadienes with diboron compounds will be discussed.
(i) In the first section, Co(IMes)2Cl2 catalyzed borylation of aryl halides will be discussed. [3a] The robust protocol, operating under mild condition facilitate the borylation of a diverse range of aryl halides with great efficacy, which includes the challenging aryl chlorides. The preliminary mechanistic studies suggest that base-bis(pinacolato)diboron adduct reduces the Co(IMes)2Cl2 complex to generate Co(IMes)2Cl complex, which acts as an active catalytic species.
(ii) The second section deals with catalytic synthesis of primary and secondary alkyl boronic esters using alkyl halides. [3b] The in situ generated Co-NHC complex, in assistance with base and diboron compound, produces the corresponding borylated product from alky halides. The reaction proceeds under very mild conditions and covers a wide range of alkyl halides, including chlorides having different functional groups.
(iii) In the third section, development in selective hydroboration of vinyl arenes and aliphatic alkenes will be discussed. [3c] Catalyzed by Co(I)NHC complex, the alkene hydroboration by pinacol borane gives Markovnikov selective product with good selectivity, where the regio-selectivity is controlled by phenyl substituent. In absence of that, complete inversion in the selectivity has been observed. The preliminary mechanistic cycle suggests that the catalytic cycle proceeds via oxidative addition of pinacol borane to [Co] followed by alkene insertion and reduction elimination steps.
(iv) The last section discusses the interaction of diazabutadiene molecules with diboron compounds. [3d] The diazabutadiene derivatives have been observed to completely cleave the B-B bond of Bis(catacolato)diboron and Bis(dithiocatacolato)diboron. The preliminary findings hint towards homolytic cleavage of the B-B bond by concerted interaction of the two nitrogen atoms of diazabutadiene with the two boron atoms of the diboron from the same face.
References:
[1] Boronic Acids-Preparation and Applications in Organic Synthesis, Medicine and Materials, 2nd ed.; Hall, D. G., Ed.; Wiley-VCH: Weinheim, 2011.
[2] Neeve, E. C.; Geier, S. J.; Mkhalid, I. A. I.; Westcott, S. A.; Marder, T. B. Diboron(4) Compounds: From Structural Curiosity to Synthetic Workhorse. Chem. Rev. 2016, 116, 9091-9161.
[3] (a) Verma, P. K.; Mandal, S.; Geetharani, K. ACS Catal. 2018, 8, 4049-4054. (b) Verma, P. K.; Prasad, K. S.; Varghese, D.; Geetharani, K. Org. Lett. 2020, 22, 4, 1431-1436. (c) Verma, P. K.; Setulekshmi, A. S.; Geetharani, K. Org. Lett. 2018, 20, 7840-7845. (d) Verma, P. K.; Meher, N. K.; Geetharani, K. Accepted for publication in Chem. Commun., Manuscript ID: CC-COM-06-2021-002881.R2
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