74,255 research outputs found
The transition from 3C SiC(111) to graphene captured by ultra high vacuum scanning tunneling microscopy
No full textIn this paper we clarify the transformation mechanism of 3C-SiC into graphene upon thermal decomposition, by a combination of high resolution Scanning Tunneling Microscopy (STM) images and first principle calculations. We studied the transition from 3C-SiC to graphene by high temperature annealing of C-terminated 3C SiC (1 1 1)/Si (1 1 1) samples in Ultra High Vacuum. By using STM we were able to observe very clear atomic resolution images of the transition from SiC (v33)R30࠴o a new intermediate stage SiC View the MathML source (very close to the graphene (2 נ2) reconstruction) after annealing at 1250 î We also obtained images of the transformation of the intermediate structure into a (1 נ1) monolayer graphene, caused by further sublimation of atoms in the subsurface layer. We have interpreted the results by using Density Functional Theory - Local Density Approximation calculations, which give full account of the SiC (v33)R30࠲econstruction, but fail to describe the SiC View the MathML source structure due to its incommensurability with the 3C-SiC (1 1 1) lattice.Full Tex
Epinephelus cameronii Gupta 1963, n
No full textEucreadium cameronii Gupta 1963 Synonyms: Hamacreadium manteri Gupta & Kumari, 1974 n . syn. Records. From Securicula gora (Hamilton) [as Chela gora (Hamilton)] (Cypriniformes: Cyprinidae) from Varanasi, Uttar Pradesh, India by Gupta (1963). From S. gora [as Chela gora] from Kanpur, Uttar Pradesh, India by Gupta & Govind (1983). From the large razorbelly minnow, Salmophasia bacaila (Hamilton) [as Chela bacaila (Hamilton)] (Cyprinidae) and Se. gora [as Chela gora] from Ludhiana and Rupnagar, Punjab, India by Gupta & Kumari (1974) as H. manteri. Remarks. The specimens described by Gupta & Kumari (1974) clearly do not belong in Hamacreadium because the genital pore is medial, the ovary is entire, the vitelline field reaches to the oral sucker and the hosts are freshwater fishes. The oral and ventral suckers are also of similar size, suggesting a species of Eucreadium, three species of which have been proposed from cyprinids in India: E. cameronii, Eucreadium hemlatae Gupta & Govind, 1983 and Eucreadium jhingrani Srivistava & Singh, 1967. The description of Gupta & Kumari (1974) is indistinguishable from E. cameronii and so H. manteri is synonymised with that species here.Published as part of Martin, Storm B., Cutmore, Scott C., Ward, Selina & Cribb, Thomas H., 2017, An updated concept and revised composition for Hamacreadium Linton, 1910 (Opecoelidae: Plagioporinae) clarifies a previously obscured pattern of host-specificity among species, pp. 151-187 in Zootaxa 4254 (2) on page 174, DOI: 10.11646/zootaxa.4254.2.1, http://zenodo.org/record/54586
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Early Buddhist architecture of Bengal: morphological study on the vihāra of c. 3rd to 8th centuries
No full textThis dissertation examines the evolution of early Buddhist architectural forms of Bengal, specifically its vihāra and shrine structures. In general, this research explores Gupta and post-Gupta (c. third to eighth centuries AD) vihāra architecture of Bengal, where the primary focus is on the Buddhist shrine architecture constructed during this period. There is a preconception amongst historians that the period between the Gupta and the Pāla periods was characterized by disorder and chaos, commonly known as the period of Matsyanyayam. This is the reason why discussions on the architectural history of Bengal have generally commenced from the Pāla period (c. 750 AD onwards). Analyzing extant and new evidences this study argues that the Buddhist architecture of Bengal thrived during the intervening period, albeit under the patronage of local kings and rulers. In the field of art and sculpture it is accepted that Buddhist Pāla art was a continuation of previous Gupta art forms, where post-Gupta period acted as the transition or a bridge. Following this general pattern, as this thesis argues, the rectangular Gupta shrine plan takes a mature cruciform shape during the Pāla period through a complex morphological development. The nature of Buddhist shrine architecture in Bengal during the early Gupta, later Gupta, and post-Gupta periods is described in the light of analyzed archaeological findings and architectural trends
Noncentral moderate deviations for time-changed multivariate Lévy processes with linear combinations of inverse stable subordinators
Get PDFThe term noncentral moderate deviations is used in the literature to mean a class of large deviation principles that, in some sense, fills the gap between the convergence in probability to a constant (governed by a reference large deviation principle) and a weak convergence to a non-Gaussian (and non-degenerating) distribution. Some noncentral moderate deviation results in the literature concern time-changed univariate Lévy processes, where the time-changes are given by inverse stable subordinators. In this paper we present analogue results for multivariate Lévy processes; in particular
the random time-changes are suitable linear combinations of independent inverse stable subordinators
Neolebouria leiperi Gupta 1956, n. comb.
No full text<i>Neolebouria leiperi</i> (Gupta, 1956) n. comb. <p> <b>Synonyms:</b> <i>Hamacreadium leiperi</i> Gupta, 1956.</p> <p> <b>Records.</b> From an unidentified “marine catfish” in the Gulf of Mannar by Gupta (1956).</p> <p> <b>Remarks.</b> This species was described based on two specimens and was considered a synonym of <i>H</i>. <i>mutabile</i> by Hafeezullah (1971). However, the ovary is distinctly tri-lobed, the genital pore is distinctly inter-caecal and the anterior extent of the excretory vesicle was not described. Therefore, it is consistent with the current concept of <i>Neolebouria</i>. In particular, it closely resembles species placed in the “maorum” body-type group by Dronen <i>et al</i>. (2014), which are characterised by an elongate linguiform body, a relatively small equatorial ventral sucker and a distinctly post-bifurcal and inter-caecal genital pore. One of these species, <i>N</i>. <i>capoori</i>, was also described from Indian waters, but that species is smaller (1,920–2,520 <i>vs</i> 3,500–5,500 µm long) and has larger pre-ovarian and post-testicular areas. Therefore, <i>N</i>. <i>leiperi</i> n. comb. is considered a distinct species of <i>Neolebouria</i>. Although Gupta (1956) possibly described <i>N</i>. <i>krusadaiensis</i> and <i>N</i>. <i>leiperi</i> from the same host species, perhaps even individual “catfish”, on the basis of limited material, the two appear to be distinct species because the former has a prebifurcal genital pore.</p>Published as part of <i>Martin, Storm B., Cutmore, Scott C., Ward, Selina & Cribb, Thomas H., 2017, An updated concept and revised composition for Hamacreadium Linton, 1910 (Opecoelidae: Plagioporinae) clarifies a previously obscured pattern of host-specificity among species, pp. 151-187 in Zootaxa 4254 (2)</i> on page 176, DOI: 10.11646/zootaxa.4254.2.1, <a href="http://zenodo.org/record/545862">http://zenodo.org/record/545862</a>
Ganita-Bhârati. Bulletin of the Indian Society for History of Mathematics, Ed. R. C. Gupta
No full textGanita-Bhârati. Bulletin of the Indian Society for History of Mathematics, Ed. R. C. Gupta. In: Revue d'histoire des sciences, tome 37, n°1, 1984. p. 96
Ganita-Bhârati. Bulletin of the Indian Society for History of Mathematics, Ed. R. C. Gupta
No full textGanita-Bhârati. Bulletin of the Indian Society for History of Mathematics, Ed. R. C. Gupta. In: Revue d'histoire des sciences, tome 37, n°1, 1984. p. 96
Parapanteles arka Gupta, n. sp.
No full textParapanteles arka Gupta n. sp. Plates. III–V & XXI. Figs 11 −20, 78. Female. Holotype (Fig. 11). Body length = 3.30 mm. Diagnosis. Propodeum areola 1.05 × longer than wide; anterior diagonal carinae of propodeum shallowly merging anterior margin of propodeum. Hind tibia (0.73) 2.4 × longer than exserted part of ovipositor (0.30). First metasomal tergal plate longer than wide; second tergum wider than long; second tergum median length subequal to that of third tergum. Ovipositor sheaths curved and hairy at apex; gently decurved, projecting beyond apex of gaster. Body colour. Black. Head black. Ocelli brown, antenna scape distinctly yellowish brown (pedicel dark brown) black, eyes dark brownish black with pale yellow palps, apex of mandible yellowish brown and base dark brown. Fore and mid leg with coxa and trochanter black, femur yellow brown except brown patch at extreme basal tip, tibia yellow, tarsi brown, apex of apical tarsus brown; hind leg with coxa and trochanter black, femur yellow brown except brown patch at extreme basal tip, tibia yellow except brown infuscation at apical 1 / 5 th, tibial spurs yellowish brown, tarsus brown, apical 1 / 4 th of basitarsus yellow. Mesosoma black. Wings hyaline, veins C+SC+R and metacarpus (R 1) dark brown; pterostigma brown (except extreme pale apex), vein (RS+M)a, m-cu, 1 M testaceous; veins r, 2 RS light brown and 2 M dark brown; hind wing veins translucent. Tegula brown black. Head. (Fig. 12). Eyes densely setose. Face rough with shallow closely placed punctations; vertex rough and dull with sparse pilosity; clypeus densely setose. Head wider than long, width (0.85)/height (0.77) = 1.1; compound eye height = 0.43 mm; inter tentorial pit distance = 0.21 mm; width of face at dorsal clypeal edge = 0.44 mm; clypeus width = 0.17 mm; vertex width = 0.63 mm; length of first flagellomere = 0.25 mm; width of first flagellomere = 0.09 mm; length of second flagellomere = 0.22 mm; width of second flagellomere = 0.09 mm; length of third flagellomere = 0.20 mm; width of third flagellomere = 0.09 mm; terminal flagellomere length = 0.11 mm; terminal flagellomere width = 0.06 mm; penultimate flagellomere length = 0.91 mm; penultimate flagellomere width = 0.07 mm; terminal flagellomere length/width = 1.83; malar space height(0.13)/basal width of mandible(0.09) = 1.4; ocello-ocular distance = 0.13 mm; inter-ocellar distance = 0.14; face width at upper edge of posterior ocelli = 0.57 mm. Mesosoma (Figs 14 & 14 A). Mesosoma median length = 1.28 mm; mesosoma length/width (1.05) = 1.21. Mesoscutum with coarse punctate sculpture that fades near the scutellar groove with shallow pilosity; scutoscutellar groove distinctly crenulate with 12 deep costulae; scutellum with shallow and distantly placed punctations, scutellum with shallow pilosity, laterally with costulate sculpture which become narrower and elongated towards posterior edge; posterior band of scutellum polished; metanotum subrectangular. Mesopleuron dull rugose with dense pilosity in diagonal anterior half (posterior half smooth shiny and devoid of setae). Metapleuron smooth and shiny, anterior pit deep. Hind coxae shiny, laterally with shallow punctures. Propodeum with clearly defined wide, strong and shiny areola (areola devoid of setae); propodeum rugose with shallow pilosity (setae confined near the lateral edges) in basal half excluding areola. Areola 1.05 × longer than wide; anterior diagonal carinae of propodeum shallowly merging anterior margin of propodeum (evident in KOH treated samples Fig. 14 A); areola open near the anterior edge; costulae complete and prominent, anterior diagonal carinae sloping down behind spiracles; spiracles large and oval. Wings (Fig. 13). Pterostigma length (0.34)/height (0.24) = 1.42. 1 RS length = 0.07 mm; 1 r = 0.28 mm; 2 Rs = 0.14 mm; 1 CUa length (0.18)/ 1 CUb length (0.25) = 0.72; RS+Ma length = 0.49 mm; RS+Mb = 0.14 mm; M+CU length = 1.05 mm; Hind wing: 1 M length = 0.38 mm; 1 M length (0.38)/M+CU length (0.36) = 1.05; length r-m (0.22)/length cu-a (0.25) = 0.88; 1 A length = 0.27 mm. Metasoma (Fig. 15). Metasoma median length = 1.77 mm (including exserted ovipositor = 0.30 mm); first tergum length/apical width/basal width/median width = 0.53 / 0.28 / 0.40 / 0.37 mm; apical 3 / 4 th rugose with punctations; apical 1 / 4 th comparatively smooth; widening from base to apex. Second and subsequent tergites with fine granulations. Second tergum wider than long, second tergum median length subequal to that of third tergum. First tergum basal width = 0.28 mm; first tergum apical width = 0.4 mm; first tergum median width = 0.37 mm; second tergum basal width = 0.55 mm; second tergum median length = 0.19; second tergum apical width = 0.66 mm; third tergum median length = 0.19 mm; Ovipositor (Figs 15 A, 78) = 0.90 mm. Ovipositor sheaths projecting beyond the apex of gaster. Exserted part of ovipositor = 0.30 mm. Ovipositor sheaths long and slender in lateral view, hairy in apical half; gently decurved, projecting beyond apex of gaster. PLATES III. Parapanteles arka n. sp. Figs 11−14. Female: 11 —Habitus. 12 —Head. 13 —Fore wing. 14 — Mesosoma & mediotergites 1−2. 14 A—Mesosoma (KOH treated). PLATES IV. Parapanteles arka n. sp. Figs 15 – 15 A. 15 —Metasoma. 15 A—Ovipositor. PLATES V. Parapanteles arka n. sp. Figs 16−20. 16 —Host caterpillar, Curetis thetis (Drury). 17 — Curetis thetis pupa. 18 —Caterpillar of C. thetis with cocoons of P. arka n. sp. 19 —Adult female of C. thetis. 20 —Adult male of C. thetis. Hind tibia (0.73) 2.4 × longer than exserted part of ovipositor (0.30). Male. Similar to female. Host. Curetis thetis (Drury) (Lepidoptera: Lycaenidae) on the host plant Millettia (= Pongamia) pinnata (L.) Panigrahi (Fabaceae) (Figs 16−20). Type material. Holotype, one female on card, INDIA, Karnataka, Jalahalli, 14.viii. 13, coll. Ashok Sengupta, ex. larvae of Curetis thetis (Drury) (Lepidoptera: Lycaenidae) (Fig. 18) on (= Pongamia) pinnata (L.) Panigrahi (Fabaceae). Paratypes, two females and two males on card, with same data as holotype. Repository. All types & specimens deposited in NBAII, Bangalore, India. Code. NBAII /Bra/Mic/Para/ arka / 14813 -A(Holotype), NBAII /Bra/Mic/Para/ arka / 14813 -B (Paratype). Etymology. The specific epithet ‘ arka ’ is of Sanskrit origin and is coined after the host ‘ Curetis thetis ’ commonly known as ‘ Indian Sunbeam’. ‘ Arka ’ in sanskrit means ‘sunbeam’.Published as part of Gupta, Ankita, Churi, Paresh V., Sengupta, Ashok & Mhatre, Sarang, 2014, Lycaenidae parasitoids from peninsular India with description of four new species of microgastrine wasps (Hymenoptera: Braconidae) along with new insights on host relationships, pp. 439-470 in Zootaxa 3827 (4) on pages 444-448, DOI: 10.11646/zootaxa.3827.4.2, http://zenodo.org/record/25237
Properties of Tests Concerning Covariance Matrices of Normal Distributions
Get PDF1 online resource (PDF, 13 pages)Gupta, Somesh Das; Giri, N. C.. (1971). Properties of Tests Concerning Covariance Matrices of Normal Distributions. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/199137
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