171,481 research outputs found
Ca. 820-640 Ma SIMS U-Pb age signal in the peripheral Vijayan Complex, Sri Lanka: Identifying magmatic pulses in the assembly of Gondwana
No full textSri Lanka comprises three roughly north-south trending amphibolite- to granulite-facies lithotectonic complexes, from west to east the Highland Complex, the Wanni Complex, and the Vijayan Complex. These terranes were correlated with other East Gondwana continental terranes with similar lithologies forming at similar ages. The Wanni Complex and the Vijayan Complex have been interpreted as volcanic arc terranes brought together by a double-sided subduction. The Highland Complex represents the metamorphosed accretionary prism within the suture when the Wanni and Vijayan Complexes were juxtaposing against each other. In contrast to the Wanni and Highland Complexes, the Vijayan Complex has yielded only a few geochronological data with satisfactory precision. Previous studies suggested that the Vijayan Complex comprises ∼1100–924 Ma granitic gneisses, which were metamorphosed during ∼590–456 Ma. More recently, ∼772–617 Ma mafic intrusions have been identified. This study divides the Vijayan granitic gneisses and the associated melt products geochemically into a low-Nb series and a more primitive high-Nb series. Our SIMS U-Pb zircon data suggested that both series have protolith magmatic ages of ∼1062–935 Ma, and metamorphic ages of ∼580–521 Ma, which is consistent with previous work. However, some of the Vijayan granitic gneisses and granitic anatectic melt products at the Highland-Vijayan tectonic mixed zone preserve an additional Tonian-Cryogenian (∼820–630 Ma) age signal. This age signal suggested that felsic magmatism also occurred when mafic granulites were emplaced along the Highland-Vijayan boundary, which is broadly coeval with to the bimodal magmatism occurring along the Highland-Wanni boundary. This study also suggests that charnockitisation in the Vijayan Complex occurred at 562 ± 6 Ma during the Neoproterozoic regional metamorphism. The Tonian-Cryogenian signal preserved in the Highland-Vijayan tectonic mixed zone can also be found in the alkaline intrusion hosted by the Namuno Terrane and the Lurio Belt in Mozambique. This indicates a relationship between the Vijayan granitic gneisses and the Lurio foreland metagranitic basement, while the Namuno Terrane and the Lurio Belt are correlated with the Highland-Vijayan tectonic mixed zone. The ages and the isotope signatures of these granitic bodies further suggest a genetic relationship of these granitic bodies with various magmatic intrusions in East Antarctica.</p
Paramicrolaimus damodarani Jacob, Jaleel & Vijayan, 2015, sp. nov.
No full textDescription of Paramicrolaimus damodarani sp. nov. (Figs 2–4) Material examined. Holotype, two paratype males and two juveniles [Slide No.IO/SS/NEM/00021; Deposited at FORV Referral Centre, Centre for Marine Living Resources and Ecology, Kochi, Kerala, India.] collected from continental margin of south eastern Arabian Sea. Type locality. Holotype and paratype males: Continental margin of south eastern Arabian Sea—off Kannur, 11 ° 45 ’ 02” N, 74 ° 41 ’ 47 ” E, 95 m, 11.02. 2012 (FORVSS 295). Two juveniles: South eastern Arabian Sea—off Cape Comorin, 7 ° 09’ 12 ” N, 77 ° 19 ’ 14 ” E, 207 m, 21.04. 2005 (FORVSS 233). Sediment texture was silt with low percentages of clay, bottom temperature 26.6 °C, bottom salinity 35.65 psu, bottom dissolved oxygen concentration 2.98 ml/l. Description. Holotype (male): Body cylindrical, long and thread like. Total body length 1280 µm, a = 51.2, b = 9.14, c = 20.32. Body diameter 20 µm at the level of posterior cephalic setae, with maximum 25 µm at mid body and 25 µm at anus. Cuticle thick, striated; striation in the cephalic region weak, distinct at mid body and caudal region. Hypodermal gland cells present. Head without striation, slightly constricted at the level of amphids. Labial sensillae barely visible. Cephalic setae in two separate circles (6 + 4), with similar lengths (13–14 µm). Somatic setae present in cephalic (5 µm) and caudal (7 µm) regions. Buccal cavity irregular, with deep and narrow anterior part and posterior part with sclerotized walls, two teeth present as dorsal and right subventral projections. Amphids wide (11 µm), thick walled, transversely oval-shaped with a small dorsal limb, located 19 µm away from the anterior end. Oesophagus 140 Μm long with swollen anterior end, middle part thin and cylindrical; posterior end swollen resembling a slightly elongated or weak oesophageal bulb (35 Μm long and 10 Μm wide). Males diorchic. Spicules paired, equal in size, 28 µm long, strongly arcuate, proximally cephalate with a distinct ventral, raised keel-like structure at mid-length. Gubernaculum parallel to spicule, simple in shape with lateral wing in the middle part. Seven distally expanded, cuticularised, protruding, precloacal supplements, each with distal thorn-like structures at their tips. First anterior and last posterior precloacal supplements slightly smaller than those between. Tail conoid, attenuated, ventrally coiled; 63 µm in length. Short, broad terminal spinneret present, strongly cuticularised, with long terminal setae arising from it dorsally. Females and Juveniles. Females not found; juveniles resemble males in general morphology (Table 1). Diagnosis. Cuticle finely striated. Conspicuous amphids with thick wall, transversely oval-shaped with a small dorsal limb. Spicules paired, strongly arcuate, proximally cephalate with a distinct central keel. Gubernaculum simple, plate-like, with a lateral wing in the middle part. Seven cuticularised, protruding, ventrally placed precloacal supplements. Tail conoid with a cuticularised terminal spinneret. Relationships. The general shape of the body and the spicular apparatus, position and number of cephalic setae, and position and shape of the amphid place the present specimens in Paramicrolaimus Wieser, 1954 (Figs 2–4; Tables 1 & 2). They are most similar to Paramicrolaimus mirus Tchesunov, 1988 in the general shape of the body, buccal cavity, oesophagus, size and shape of amphid and shape of gubernaculum. Paramicrolaimus damodarani sp. nov. strongly differs from P. mirus in body length (1.28 mm vs 4.06 mm), length of cephalic setae (6 + 8 µm vs 13 + 14–15 µm), a -value (105–106 vs 51–52.4), b - value (21.7–21.8 vs 8.8–9.1), c -value (28–40.5 vs 18.8–20.3), number of precloacal supplements (7 vs 9), shape and size of spicular apparatus (28 µm vs 23 µm), and in having a terminal spinneret which is absent in P. mirus (Figs 2–4, Tables 1 & 2). Specimens of P. mirus from the Yellow Sea (Huang & Zhang, 2005) showed larger measurements in all morphological characters compared with P. damodarani sp. nov. (Table 2). Also, the spicule of P. mirus has a velum (Huang & Zhang 2005) whereas P. damodarani sp. nov. has a central keel at mid-length. The gubernaculum in both the species were plate-shaped with a lateral wing in middle part but is of different size (19 µm vs 18 µm). The spinneret of P. damodarani sp. nov. has strongly cuticularised walls and the setae in the caudal region are longer (Figs 2, 3) than in P. mirus. Paramicrolaimus damodarani sp. nov. can be differentiated from P. spirulifer in being smaller (1.28 mm vs 4.43 mm) in all morphological measurements in addition to the number of precloacal suppliments (7 vs 6) and the shape of the gubernaculum (Figure 2–4; Table 2). While Wieser, 1959 reported 6 precloacal supplements in P. spirulifer, Jensen (1978) counted 10 in the redescription of the species. The gubernaculum in P. spirulifer is weakly sclerotized and apparently surrounds the distal parts of the spicules but in P. damodarani sp. nov. it is plate-shaped with a lateral wing in the middle part. Etymology. The species is named in honour of Prof. R. Damodaran, with deep gratitude and in appreciation of his invaluable contributions to benthic studies in India.Published as part of Jacob, Jini, Jaleel, Abdul & Vijayan, Anil Kumar, 2015, A new species of the rare nematode genus Paramicrolaimus Wieser, 1954 (Chromadorida: Paramicrolaimidae) from the south eastern Arabian Sea, pp. 563-571 in Zootaxa 3904 (4) on pages 566-568, DOI: 10.11646/zootaxa.3904.4.5, http://zenodo.org/record/23306
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Mitomycin C in highly myopic eyes - Author reply
No full textOphthalmology. 2005 Feb;112(2):208-18; discussion 219.
Mitomycin C modulation of corneal wound healing after photorefractive keratectomy in highly myopic eyes.
Gambato C, Ghirlando A, Moretto E, Busato F, Midena E.
SourceRefractive Surgery Service and Antimetabolite Therapy Research Unit, Department of Ophthalmology, University of Padova, Padova, Italy.
Abstract
PURPOSE: To evaluate the role of topical mitomycin C in corneal wound healing (CWH) after photorefractive keratectomy (PRK) in highly myopic eyes.
DESIGN: Prospective, double-masked, randomized clinical trial.
PARTICIPANTS: Seventy-two eyes of 36 patients affected by high (>7 diopters) myopia.
METHODS: In each patient, one eye was randomly assigned to PRK with intraoperative topical 0.02% mitomycin C application, and the fellow eye was treated with a placebo. Postoperatively, mitomycin C-treated eyes received artificial tears (3 times daily, tapered in 3 months), whereas the fellow eye was treated with fluorometholone sodium 2% and artificial tears (3 times daily, tapered in 3 months).
MAIN OUTCOME MEASURES: Uncorrected visual acuity (UCVA) and best-corrected visual acuity (BCVA), contrast sensitivity, manifest refraction, and biomicroscopy. Contrast sensitivity was determined using the Pelli-Robson chart. Corneal confocal microscopy documented CWH.
RESULTS: Mean follow-up was 18 months (range, 12-36). No side effects or toxic effects were documented. At 12-month follow-up examination, UCVAs (logarithm of the minimum angle of resolution) were 0.4+/-0.48 and 0.5+/-0.53 (P = .03) in mitomycin C-treated eyes and corticosteroid-treated eyes, respectively. At 1 year, corneal haze developed in 20% of corticosteroid-treated eyes, versus 0% of mitomycin C-treated eyes. At 12, 24, and 36 months, corneal confocal microscopy showed activated keratocytes and extracellular matrix significantly more evident in untreated eyes (Ps = 0.004, 0.024, and 0.046, respectively).
CONCLUSION: Topical intraoperative application of 0.02% mitomycin C can reduce haze formation in highly myopic eyes undergoing PRK.
Comment in
Ophthalmology. 2006 Feb;113(2):357; author reply 357-8
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
sj-docx-1-pic-10.1177_09544062231195400 – Supplemental material for Static and dynamic behaviour of aluminium infiltrated ceramic foam at high volume fraction
No full textSupplemental material, sj-docx-1-pic-10.1177_09544062231195400 for Static and dynamic behaviour of aluminium infiltrated ceramic foam at high volume fraction by Sindhumathi Ramalingam, Krishnaraj Vijayan, Jayakrishnan Nampoothiri and Prasanth Achuthamenon Sylajakumari in Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science</p
A Multi-Language Comparison of Influences on Author Verification using Character N-Grams
No full textWe create a new multi-language corpus for author verification based on Wikipedia talkpages, and evaluate the influence that differences in topic and time have on character n-gram author profiles. Topic alignment between two texts is found to increase author verification precision, and an authors writing style is found to change over time, but not more significantly after 3 years than after 1 year.Information ArchitectureWISElectrical Engineering, Mathematics and Computer Scienc
A 0.12mm<sup>2</sup> Wien-Bridge Temperature Sensor with 0.1°C (3σ) Inaccuracy from -40°C to 180°C
No full text Resistor-based temperature sensors can achieve much higher resolution and energy efficiency than conventional BJT-based sensors [1], but they typically occupy more area (> 0.25 mm 2 ) and have lower operating temperatures (le 125 {circ} {C}) [2]-[4]. This work describes a 0.12mm 2 resistor-based sensor that uses a Wien-bridge (WB) filter to achieve 0.1 {circ} {C} (3 sigma) inaccuracy from - 40 {circ} {C} to 180 {circ} {C}. Compared to a state-of-the-art WB sensor [4], it occupies 6 × less area and achieves comparable relative accuracy over a 76% wider operating range. Session 10.3 Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Electronic InstrumentationMicroelectronic
FIGURE 7 in Two new species of Simulium (Gomphostilbia) (Diptera: Simuliidae) from South India
No full textFIGURE 7. Molecular analyses of two new species from India: (a) Maximum likelihood phylogenetic tree of closely related members of Simulium based on COI gene sequences (Bootstrap values are shown on the branches); (B) multiple sequence alignment by MUSCLE; (C) superimposed protein structure of COI gene sequences of two new species with closely related species.Published as part of Anbalagan, Sankarappan, Vijayan, Suruliyandi, Balachandran, Chellapandian, Thiyonila, Berchmans & Surya, Aathmanathan, 2020, Two new species of Simulium (Gomphostilbia) (Diptera: Simuliidae) from South India, pp. 57-72 in Zootaxa 4742 (1) on page 71, DOI: 10.11646/zootaxa.4742.1.3, http://zenodo.org/record/367446
A ±25A Versatile Shunt-Based Current Sensor with 10kHz Bandwidth and ±0.25% Gain Error from -40°C to 85°C Using 2-Current Calibration
No full textAccurate current sensing is critical in many industrial applications, such as battery management and motor control. Precise shunt-based current sensors have been reported with gain errors of less than 1% over the industrial temperature range (-40°C to 85°C) [1]–[4]. However, since they are intended for coulomb counting, their bandwidth is limited to a few tens of Hz, making them unsuitable for battery impedance or motor-current sensing. This paper presents a current sensor with a wide (10kHz) bandwidth and a tunable temperature compensation scheme (TCS), which allows it to be flexibly used with different types of shunts while maintaining high accuracy. A low-cost room-temperature calibration scheme is proposed to optimize gain flatness over temperature by exploiting the shunt's self-heating at large currents. Over the industrial temperature range and a ±25A current range, it achieves state-of-the-art gain error (±0.25%) with both low-cost PCB and stable metal-alloy shunts.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Electronic InstrumentationMicroelectronic
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