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My Forecast by R Revathi Ramamurthy
No full textMy Forecast
R Revathi Ramamurthy, Former Dean & Principal of Shri Krishnaswamy College for Women, Annanagar , Chennai -4
Pressure fluctuations in centrifugal compressor diffusers
No full textThe unstable flow phenomenon like rotating stall and surge in centrifugal compressors occur at very low flow rates. These would cause unduly large vibrations in the turbo- machinery components and results in mechanical failure. It is important to detect this phenomenon and avoid it by means of early warning systems. An attempt has been made in this paper to study the pressure fluctuations using high frequency miniature transducers in vane and vaneless diffusers of a centrifugal compressor. The unstable nature of the flow is characterized. The observation from the measurements indicate the pressure fluctuations in the vane diffusers are getting amplified and carried to the exit of the diffuser whereas in the case of vaneless diffuser such a phenomena is not observed. The flow near the leading edge of diffuser plays an important role in diffuser performance. The unsteady pressure fluctuations in the diffuser are characterized in terms of instability parameter at various locations in the diffuser. The location where such an instability parameter is sensitive to the flow coefficient is identified as the diffuser throat. Through this instability parameter it is possible to provide early warning just before compressor goes into stall. (Author
Research and Development
No full textThis lecture was delivered by Prof. V. S. Ramamurthy during the First NIAS-DST Training Programme on ‘Impact of Globalisation’ held during October 20-24, 200
In the Making
No full textPhilip Osment’s VO, subtitled: "In The Making traces the journey of the rehearsal period of ‘Who’s Breaking’ by Philip Osment. The production was directed by Sita Ramamurthy and the sign assistant was Iona Fletcher." Osment talks and signs about the origin as of the play, which was to be about masculinity, not AIDS or deafness. The director wanted to use a deaf actor and so they made one of the characters deaf. Extract from the play introducing this character, Rob, and including Chris and Steve around whose relationship the play revolves. Ben Trott says that he and Iona had to teach Shaun Chawdhary to sign. Fletcher with Chawdhary; the same scene in the play with Chris and Rob arguing silently in sign language. The chorus piece, "Saturday Night. Best day of the week", rehearsed and performed in sign and words. Actress Jane Kemlo discussing signing and Trott discussing the role of signing in the play with Sita Ramamurthy and Fletcher, and thinking about it relation to dance. Ramamurthy directing rehearsal with actors in which signing becomes more choreographed. Performance of this restaurant sequence. Chawdhary talking about getting into signing as a language. Trott explaining how they mixed signing and mime. Play sequence set by the canal with Trott pretending to be a dog. Ramamurthy talking about the way of making the "Saturday Night" section more visual and suggests using the Stereo MCs as music to dance to. Rehearsing. Trott says he couldn’t hear the music well so had to feel the rhythm or pick it up from the other actors. Performance. Jeremy Sullivan talking about the mixture of sign, dance and gesture to communicate with the audience. Credits
Sophonia chandrai Meshram & Ramamurthy, 2013, sp. nov.
No full textSophonia chandrai sp. nov. (Figs. 1–13) Yellow. Forewing hyaline, yellowish, with pale brown stripe along anal margin rarely reaching apex of clavus, claval apex brown; second apical cell with black spot. Head angularly produced. Anterior margin of pronotum not extending beyond eyes. Anteclypeus not exceeding facial margin (Fig. 4). Frontoclypeus broad with distinct transverse ridges and face with distinct median carina. Frontal suture extending onto vertex, terminating laterad of ocelli (Fig. 4). Ocelli near lateral margins of crown, distance between eye and ocellus 3 X diameter of ocellus. Crown broadly concave and with irregular sculpturing anteriorly. Antennae situated somewhat at level with upper margin of eye in facial view. Scutellum 1.5 X as long as pronotum, transverse depression distinct and nearly reaching lateral margin. Pronotum 0.35 X longer than broad and 0.64 X longer than crown (Fig. 5). Forewing without appendix (Fig. 6). Male genitalia. Pygofer triangular, slightly pointed at apex, with several macrosetae at posterior margin, ventral process long, thin with pointed apex (Fig. 12). Subgenital plate broader at base than at apex, with median row of stout macrosetae (Fig. 8). Style preapical lobe robust, apophysis slender, apex with short, beaklike extension (Fig. 7). Connective Y-shaped with stem 3 X as long as arms, apex expanded (Fig. 11). Aedeagus robust, membranous. Dorsal apodeme robust with one pair of long, recurved apical process about as long as dorsal apodeme in lateral view; two pairs of lateral shorter, spinelike processes, one basolaterally and one near apex; aedeagal shaft curved ventrally in proximal 0.33, posteriorly in middle 0.33 and dorsally in distal 0.33 region; apex flared and rounded (Figs. 9 & 10). Female genitalia. Hind margin of seventh sternite almost straight, with median bilobed short extension (Fig. 13), ovipositor extending well beyond pygofer. Measurements. Male 4.8 mm long, 1.1 mm wide across eyes, 0.83 mm wide across hind margin of pronotum. Female 5.5 mm long, 1.33 mm wide across eyes, 1.2 mm wide across hind margin of pronotum Type material. Holotype ♂, INDIA: Manipur: Tupul (25 ° 6 ' 29 "N 92 ° 21 ' 42 "E, 1379 M), 07.vii. 2012, Mercury vapour lamp, Roni, K. Paratypes 3 ♂ & 4 ♀, same data as Holotype (NPC). Etymology. The species is named after Dr. C A. Viraktamath in recognition of his invaluable contributions to the taxonomy of leafhoppers. Remarks. Sophonia chandrai sp. nov. resembles S. complicata Viraktamath & Wesley, but can be distinguished by the shape of the aedeagus (features of S. complicata in parentheses): Pygofer ventral process long, thin with pointed apex without spinelike branch at base (slender process arises, directed caudally, upcurved at right angles at midlength, apex slightly hooked, bearing spinelike branch at base). Dorsal apodeme of aedeagus robust with one pair of long, recurved, apical process about as long as dorsal apodeme in lateral view; two pairs of lateral shorter, spinelike processes, one basolaterally and one near apex (two arms of dorsal apodemes well separated, wing like, completely covering entire length of shaft laterally, each arm with dorsomedian, caudal, and caudoventral, long processes). Sophonia complicata Viraktamath & Wesley Sophonia complicata Viraktamath & Wesley 1988: 210, Figs. 208–220 Material examined. Paratype ♂ & 1 ♀, INDIA: Mizorum: Aizawl, 18.xi. 1981, C. S. Wesley Coll. (NPC). In the key to the species of Sophonia by Viraktamath and Wesley (1988), the new species runs to Sophonia complicata Viraktamath & Wesley, but the male genitalia characters do not agree. Couplet 10 can be modified as follows to include the new species 10. Vertex with median, broad, orange stripe continued on pronotum, anteriorly narrowed; posterior half on pronotum broadned and blackish, scutellum blackish (Viraktamath & Wesley 1988: Figs 154–155); pygofer process short, blade-like, and pointed at apex Viraktamath & Wesley 1988: Fig. 159); aedeagus shaft tubular with apical, ventrally directed, platelike process (Viraktamath & Wesley 1988: Figs 162–163)...................................................... illuminata (Distant) - Vertex, pronotum, and scutellum whitish yellow; pygofer process long, slender and elbowed (Fig. 12); aedegus not as above.................................................................................................... 11 11. Two arms of dorsal apodeme well separated, winglike, completely covering entire length of shaft laterally Viraktamath & Wesley 1988: Figs 218–220)).................................................... complicata Viraktamath & Wesley - Dorsal apodeme robust with one pair of long, recurved, apical process about as long as dorsal apodeme in lateral view; two pairs of lateral shorter, spinelike processes, one basolaterally and one near apex (Fig. 9 & 10)............. chandrai sp. nov.Published as part of Meshram, Naresh M. & Ramamurthy, V. V., 2013, Description of a new evacanthine leafhopper species Sophonia chandrai sp. nov., with new record of Chudania axona (Hemiptera: Cicadellidae) from India, pp. 224-230 in Zootaxa 3717 (2) on pages 225-227, DOI: 10.11646/zootaxa.3717.2.6, http://zenodo.org/record/22307
Eusynnada canariumi Kojima, Ayri & Ramamurthy, 2016, sp. nov.
No full text<i>Eusynnada canariumi</i> sp. nov. <p>(Figs. 3, 4, 7, 8, 13, 24–30)</p> <p> <b>Description.</b> Male. Length: 4.4–4.8 mm; width: 1.9–2.0 mm.</p> <p> Male. Very similar to <i>E. plaxioides</i> except derm concolorous reddish brown except antennae and tarsi slightly paler; rostrum slightly shorter than pronotum (9: 10); antennae inserted at middle in female; prothorax 1.3 times as wide as long; elytra 1.6 times as long as wide; front tibiae slightly dentate ventrally near apex; aedeagal body truncate at caudal margin, apodemes short, about 1/3 of aedeagal body.</p> <p>Female. Resembles male except rostrum longer than pronotum (13–15: 10); antennae inserted at middle of rostrum.</p> <p> <b>Type series.</b> Holotype: male, Doi Suthep-Doi Pui, Thailand, 4–7.vii.1995, H. Kojima (TUA). Paratypes, 3 males and 2 females, same data as the holotype; 1 male and 5 females, Port Blair, S. Andaman, India, 16.xii.1991, Venna (NPC) [teneral].</p> <p> <b>Etymology.</b> This species is named after the plant genus <i>Canarium</i> on which weevils were collected.</p> <p> <b>Biology.</b> Weevils were collected from <i>Canarium euphyllum</i> Kurz. (Burseraceae) on Andaman Island. Weevils were also captured on a flowering tree probably belonging to <i>Neolamarckia</i> sp. (Rubiaceae) in Thailand by using an insect net with a long handle, which is about 6 m in length.</p> <p> <b>Distribution.</b> Andaman Island (India), Thailand.</p> <p> <b>Comment.</b> This new species is easily separable from the type species by the coloration.</p>Published as part of <i>Kojima, Hiroaki, Ayri, Shaloo & Ramamurthy, V. V., 2016, Eusynnada, a resurrected genus of Ochyromerina (Coleoptera: Curculionidae: Curculioninae: Tychiini), with description of a second species from India and Thailand, pp. 469-476 in Zootaxa 4066 (4)</i> on pages 474-475, DOI: 10.11646/zootaxa.4066.4.7, <a href="http://zenodo.org/record/270556">http://zenodo.org/record/270556</a>
Aceria Keifer 1944
No full textGenus Aceria Keifer, 1944 Type species: Eriophyes tulipae Keifer 1938:185.Published as part of Joshi, S., Menon, P. & Ramamurthy, V. V., 2011, A New Eriophyid, Aceria Madhucae N. Sp. (Acari: Eriophyidae) From India, pp. 295-301 in Acarologia 51 (3) on page 297, DOI: 10.1051/acarologia/20112014, http://zenodo.org/record/466706
Patterns of electro-magnetic response in topological semi-metals
No full textTopological semimetals are gapless states of matter which have robust and unique electromagnetic responses and surface states. In this thesis, we consider semimetals which have point like Fermi surfaces in various spatial dimensions which naturally occur in the transition between th order weak topological insulators and a trivial insulating phase. These semimetals include those of Dirac and Weyl type. We construct these phases by layering strong topological insulator phases in lower dimensions. This perspective helps us understand their effective response field theory, which is generally characterized by a -form which represents a source of Lorentz violation and can be read off from the location of the singular points in momentum space and the helicities/chiralities of the singularities. We motivate and derive effective response actions for the 2D and 3D Dirac semi-metals, the Weyl semimetal, the 3D line node semi-metal and the 3D mirror protected topological crystalline insulator.Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2019-08-22 without embargo termsThe student, Srinidhi Ramamurthy, accepted the attached license on 2019-01-03 at 22:31.The student, Srinidhi Ramamurthy, submitted this Dissertation for approval on 2019-01-03 at 22:36.This Dissertation was approved for publication on 2019-01-07 at 16:12.DSpace SAF Submission Ingestion Package generated from Vireo submission #13348 on 2019-08-22 at 14:39:05Made available in DSpace on 2019-08-23T19:51:23Z (GMT). No. of bitstreams: 3
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Previous issue date: 2019-01-0
Acalitus delhiensis Menon, Joshi & Ramamurthy 2009
No full textAcalitus delhiensis Menon, Joshi & Ramamurthy, 2009: 65 — Holotype female (IARI), from Salvadora persica (Salvadoraceae), Iari, New Delhi, India.Published as part of LIU, DONG, YI, TIAN-CI, XU, YUN & ZHANG, ZHI-QIANG, 2013, new mite species described during 2007 to 2012 3663, pp. 1-102 in Zootaxa 3663 (1) on page 39, DOI: 10.11646/zootaxa.3663.1.1, http://zenodo.org/record/563059
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