195,913 research outputs found
Melichares fici Narayanan & Ghai 1963
No full textMelichares fici Narayanan & Ghai , 1963 Melichares fici Narayanan & Ghai, 1963: 549. Melichares fici.— Gupta, 2003: 7. TYPE DEPOSITORY: National Pusa Collection, Indian Agricultural Research Institute, New Delhi, India. TYPE LOCALITY AND HABITAT: Indian Agricultural Research Institute Estate, New Delhi, India, on fruits of Ficus infectoria [Plantae: Moraceae]. NOTE: this species is provisionally maintained in this genus, but with major differences from the type species, especially the absence of st 4, the large number of teeth on the fixed and movable cheliceral digits, and the short peritreme.Published as part of De Moraes, Gilberto J., Britto, Erika P. J., Mineiro, Jefferson L. De C. & Halliday, Bruce, 2016, Catalogue of the mite families Ascidae Voigts & Oudemans, Blattisociidae Garman and Melicharidae Hirschmann (Acari: Mesostigmata), pp. 1-299 in Zootaxa 4112 (1) on page 199, DOI: 10.11646/zootaxa.4112.1.1, http://zenodo.org/record/39947
Blattisocius daci Narayanan & Ghai 1961
No full textBlattisocius daci (Narayanan & Ghai , 1961) Melichares (Blattisocius) daci Narayanan & Ghai, 1961: 18. Blattisocius daci.—Haines, 1979: 28; Zhang & Fan, 2010: 282; Britto et al., 2012: 50. TYPE DEPOSITORY: National Pusa Collection, Indian Agricultural Research Institute, New Delhi, India. TYPE LOCALITY AND HABITAT: Indian Agricultural Research Institute, New Delhi, India, collected from a laboratory colony of fruit flies Dacus cucurbitae and Dacus dorsalis (Animalia: Tephritidae) infested with phorid flies (Animalia: Phoridae). NOTE: Lindquist (1964 a: 206; 1964 b: 3895), Hughes (1976: 333) and Farrier & Hennessey (1993: 30) considered B. daci to be a junior synonym of Blattisocius mali (Oudemans, 1929). We adopted the interpretation of Haines (1979: 28), considering them to be distinct species.Published as part of De Moraes, Gilberto J., Britto, Erika P. J., Mineiro, Jefferson L. De C. & Halliday, Bruce, 2016, Catalogue of the mite families Ascidae Voigts & Oudemans, Blattisociidae Garman and Melicharidae Hirschmann (Acari: Mesostigmata), pp. 1-299 in Zootaxa 4112 (1) on page 133, DOI: 10.11646/zootaxa.4112.1.1, http://zenodo.org/record/39947
Performance and mechanism of sinusoidal leading edge serrations for the reduction of turbulence-aerofoil interaction noise
No full textThe dataset the results of a detailed experimental investigation into the effectiveness of sinusoidal leading edge serrations on aerofoils for the reduction of the noise generated by the interaction with turbulent flow.
The data underpins the paper P. Chaitanya?, P. Joseph, S. Narayanan?, C. Vanderwel, J. Turner, J. W. Kim, and B. Ganapathisubramani (2017), 'Performance and mechanism of sinusoidal leading edge serrations for the reduction of turbulence-aerofoil interaction noise', accepted in the Journal of Fluid Mechanics.</span
Moniligaster keralensis Narayanan & Sathrumithra & Anuja & Christopher & Thomas & Julka 2021, sp. nov.
No full text<i>Moniligaster keralensis</i> Narayanan & Julka, sp. nov. <p>(Figure 3)</p> <p> <b>Type material.</b> <i>Holotype</i>: Clitellate (ZSI/ WGRC / IR /INV/8839), evergreen forest, Kurichikanam in Konni Reserve Forest (9°12'17.8"N, 77°00'36.3"E) (10 km from Kokkathodu), Pathanamthitta District, Kerala, India, 03 May 2015, 534 m a.s.l., S. Sathrumithra, J.K. Joseph and A. Sasi. <i>Paratypes</i>: 4 clitellates (ZSI/ WGRC / IR /INV/8840), collection data as for holotype.</p> <p> <b>Other material.</b> 41 specimens altogether. 3 clitellates (ACESSD /EW/729), <i>Elettaria cardamomum</i> and <i>Piper nigrum</i> plantation, Chathurangappara in Cardamom Hill Reserve (9°53’46.8”N, 77°13 5.3”E), Idukki District, Kerala, India, 12 January 2011, 1105 m a.s.l., S.P. Narayanan; 1 clitellate and 7 aclitellates (ACESSD /EW/730), evergreen forest, Aluvamkudy (9°16'7.8"N, 77°00'16.8"E), Pathanamthitta District, Kerala, India, 21 August 2013, 513 m a.s.l., S.P. Narayanan, S. Sathrumithra, D. Kuriakose and A. Sasi; 1 clitellate and 6 aclitellates (ACESSD / EW/731), riparian stretch, Mundomoozhy (9°14'43.8"N, 76°55'20.1"E), Pathanamthitta District, Kerala, India, 21 August 2013, 68 m a.s.l., S.P. Narayanan, S. Sathrumithra, D. Kuriakose and A. Sasi; 4 aclitellates (ACESSD / EW/732), evergreen forest, Kottavasal in Achankovil Reserve Forest (9°4'17.4"N, 77°12'24.5"E), Kollam District, Kerala, India, 22 August 2013, 474 m a.s.l., S.P. Narayanan, T. Augustine, A. Sasi, S. Sathrumithra and D. Kuriakose; 1 clitellate (ACESSD /EW/733), evergreen forest, near to Ambanad estate in Achankovil Reserve Forest (9°02'26.4"N, 77°07'06.3"E), Kollam District, Kerala, India, 24 August 2013, 795 m a.s.l., S.P. Narayanan, D. Kuriakose, S. Sathrumithra, T. Augustine and A. Sasi; 1 clitellate (ACESSD /EW/734), mixed crop area, Peruvanthanam (9°33'55.3"N, 76°56'7.7"E), Idukki District, Kerala, India, 22 July 2014, 213 m a.s.l., J.K. Joseph; 1 clitellate and 4 aclitellates (ACESSD /EW/735), semi evergreen forest, Thannithodumoozhy in Konni Reserve Forest (9°15'19.0"N, 76°55'36.4"E), Kollam District, Kerala, India, 10 June 2016, 94 m a.s.l., S. Sathrumithra; 1 clitellate and 4 aclitellates (ACESSD /EW/736), <i>Tectona grandis</i> plantation, Pananthodu in Konni Reserve Forest (9°13’37.4”N, 76°55’26.8”E), Pathanamthitta District, Kerala, India, 10 July 2016, 105 m a.s.l., S. Sathrumithra; 1 clitellate and 6 aclitellates (ACESSD /EW/737), <i>Hevea brasiliensis</i> plantation, Chengara (9°15’2.1”N, 76°51’54”E), Pathanamthitta District, Kerala, India, 23 August 2016, 88 m a.s.l., S. Sathrumithra.</p> <p> <b>Diagnosis.</b> Colour bluish. Length 71–129 mm, diameter 4–5.5 mm, segments 109–195. Secondary male apertures paired, large transverse slits, slightly lateral to <i>b</i> setal lines, at intersegmental furrow 10/11. Spermathecal pores paired, small transverse slits, close to <i>cd</i> setal lines, at intersegmental furrow 7/8. Genital markings absent. Gizzards four in segments 14–19. Vas deferens a mass of hairpin loops, mass as large as testis sac, entering prostate directly, near the ectal end. Prostates glandular, tubular with irregular margins, slightly flattened, prostatic capsule tubular, prostatic duct bent downwards and narrowed. Spermathecal atrial glands bilobed in segment 7, glands bound together, duct of each gland about as long as the common atrial duct.</p> <p> <b>Description.</b> External: Colour bluish; body circular in cross section. Dimensions: Holotype: 71 mm by 4.5 mm at segment 9, segments 109; paratypes: 82–89 mm by 4–5 mm at segment 9, segments 135–149; other materials: 92–129 mm by 4.5–5.5 mm at segment 9, segments 166–195. Setae lumbricine, closely paired, present from segment 2; setal formula <i>aa</i> = 7–8.75 <i>ab</i> = 1.08–1.46 <i>bc</i> = 9.33–11.67 <i>cd</i> = 0.2–0.27 <i>dd</i> at segment 8, <i>aa</i> = 6.2–8.75 <i>ab</i> = 0.91–1 <i>bc</i> = 7.75–11.67 <i>cd</i> = 0.31–0.44 <i>dd</i> at segment 20 (n=3). Clitellum annular, on segments 10–13, intersegmental furrows distinct, colour reddish. Spermathecal pores small transverse slits, aligned between setae <i>cd</i>, at intersegmental furrow 7/8. Male pores paired, minute, at the centre of short, eversible penes, secondary male apertures oval-shaped at intersegmental furrow 10/11 (Fig. 3A). Female pores paired, minute, at intersegmental furrow 11/12, slightly median to <i>b</i> setal lines. Nephridiopores minute, present from segment 3, aligned with <i>d</i> setal lines. Genital markings absent.</p> <p>Internal: Septum 5/6 slightly muscular, septa 6/7/8/9 muscular, septum 9/10 delicate. Gizzards four in segments 14–19; intestinal origin in segments 27–29. Commissures of extra-oesophageal vessels present on posterior faces of septa 8/9 and 9/10. Testis sacs paired, in segments 9–11 on one side and dislocated to segments 13–14 on the other side but retaining connection with septum 9/10 through a narrow tube like membranous structure; vas deferens in segments 9–10, coiled into a mass of hairpin loops, mass as large as testis sac, entering near the ectal end of the prostate gland directly without entering musculature. Prostates paired, extending from segment 11 to segments 13–14, glandular, tubular and somewhat flattened with irregular margins (Fig. 3B); capsule tubular, slightly enlarged ectally before its junction with prostatic duct (Fig. 3C); prostatic duct bent downwards, narrowed and slightly muscular, much shorter than gland, about one ninth of the combined length of the gland and duct. Spermathecae paired in segment 8, ampulla elongate-ovoidal, each with a long coiled duct penetrating septum 7/8 to discharge at junction of ducts of dichotomous atrial glands in segment 7; atrial glands bound together with one on top of the other (Fig. 3D), duct of each gland, almost as long as the common atrial duct. Ovarian chamber complete, ovisacs in segments 12–16. Nephridia avesiculate; functional at segment 10.</p> <p> <b>Etymology.</b> The specific epithet ‘ <i>keralensis’</i> is derived from the name of the Indian state of Kerala, where this species was collected.</p> <p> <b>Ingesta.</b> Colloid of fine soil (silt) with tiny pieces of quartz and brown organic particles.</p> <p> <b>Habitat.</b> Evergreen and semi-evergreen forests and plantations of cardamom, black pepper, teak and rubber.</p> <p> <b>Biology.</b> The species shows serpentine movement when disturbed. Autotomy and regeneration of lost parts appear to be common.</p> <p> <b>Distribution.</b> India: Kerala State: widespread in the middle and higher altitude regions of Idukki District: Chathurangappara, Peruvanthanam; Pathanamthitta District: Aluvamkudy, Chengara, Kurichikanam, Mundomoozhy, Pananthodu, Thannithodumoozhy; and Kollam District: Kottavasal, near to Ambanad estate (Fig. 4).</p> <p> <b>Remarks.</b> <i>Moniligaster keralensis</i> <b>sp. nov.</b> belongs to the same group of species as <i>M. bahli</i> <b>sp. nov.</b> (see remarks there) and <i>M. blakemorei</i> <b>sp. nov.</b>. The species are compared in Table 1. Differences of <i>M. keralensis</i> <b>sp. nov.</b> to other species of the group are as follows: <i>M. keralensis</i> <b>sp. nov.</b> is distinguished from <i>M. gravelyi</i> by the junction of vas deferens with the prostate glands at ectal rather than at ental end and intestinal origin (in segments 27–29 vs segment 25). <i>M. keralensis</i> <b>sp. nov.</b> differs from <i>M. troyi</i> in the shape of the prostate glands (tubular vs club-shaped), body dimensions (length 71–129 mm vs 60–63 mm; diameter 4–5.5 mm vs 3.5–3.7 mm), junction of vas deferens with the prostate glands (at ectal end vs about middle) and length of atrial gland duct (almost as long as common atrial duct vs about one fourth the length of common atrial duct). For differences of <i>M. bahli</i> <b>sp. nov.</b> and <i>M. blakemorei</i> <b>sp. nov.</b>, see the remarks sections of these species.</p>Published as part of <i>Narayanan, S. Prasanth, Sathrumithra, S., Anuja, R., Christopher, G., Thomas, A. P. & Julka, J. M., 2021, Three new species and four new species records of earthworms of the genus Moniligaster Perrier, 1872 (Clitellata: Moniligastridae) from Kerala region of the Western Ghats Biodiversity Hotspot, India, pp. 381-397 in Zootaxa 4949 (2)</i> on pages 386-388, DOI: 10.11646/zootaxa.4949.2.11, <a href="http://zenodo.org/record/4636238">http://zenodo.org/record/4636238</a>
K R Narayanan Oration (1994 to Present)
No full textThe Narayanan Lectures are among the major public lectures within ANU. They honour a past-President of India, Dr K R Narayanan. Each year this oration has been delivered by a major public figure. The list of distinguished speakers includes Dr Raja J. Chelliah, Professor Jagdish Bhagwati, Professor U R Rao, Mr P. Chidambaram, Dr C. Rangarajan, Professor Lord Meghnad Desai, Professor Pranab Bardhan, Dr Vijay Kelkar, Professor M S Swaminathan, Dr K. Kasturirangan, Dr R. Pachauri, Ms Sunita Narain, Professor Roddam Narasimha, Mr Montek S. Ahluwalia, Dr D. Subbarao and Dr Kaushik Basu.We would like to thank the Australia-India Council, the Australian Bureau of Statistics, Network Economics Consulting Group, the College of Asia and the Pacific and College of Business and Economics at ANU, as well as the Australian Centre for International Agricultural Research (ACIAR), for their generous financial support of these lectures
Publication productivity of Prof. P.S. Narayanan: A Scientometric Portrait
Get PDFIn this study, researchers were made an attempt to analyse research output of Prof. P S Narayanan was scientists from IISc Bengaluru, under the scientometric framework. For this study data is obtained from the Web of Science database. Prof. Narayanan has published 89 research papers among these highest numbers of research papers were published in the year 1978 when he was 52 years old. 32.59% papers were authored by 3 authors. He has published 14.61 % of his research papers in Ferroelectrics during 1978-94. 120 times his research papers were cited and published in Indian Journal of Pure Applied Physics
Airfoil noise reductions through leading edge serrations
No full textThis paper provides an experimental investigation into the use of leading edge (LE) serrations as a means of reducing the broadband noise generated due to the interaction between the aerofoil’s LE and impinging turbulence. Experiments are performed on a flat plate in an open jet wind tunnel. Grids are used to generate isotropic homogeneous turbulence. The leading edge serrations are in the form of sinusoidal profiles of wavelengths, ?, and amplitudes, 2h. The frequency and amplitude characteristics are studied in detail in order to understand the effect of LE serrations on noise reduction characteristics and are compared with straight edge baseline flat plates. Noise reductions are found to be insignificant at low frequencies but significant in the mid frequency range (500 Hz–8 kHz) for all the cases studied. The flat plate results are also compared to the noise reductions obtained on a serrated NACA-65 aerofoil with the same serration profile. Noise reductions are found to be significantly higher for the flat plates with a maximum noise reduction of around 9 dB compared with about 7 dB for the aerofoil. In general, it is observed that the sound power reduction level (?PWL) is sensitive to the amplitude, 2h of the LE serrations but less sensitive to the serration wavelength, ?. Thus, this paper sufficiently demonstrates that the LE amplitude acts as a key parameter for enhancing the noise reduction levels in flat plates and aerofoils
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