1,721,247 research outputs found
Novel Bidirectional Single-phase Single-Stage Isolated AC–DC Converter With PFC for Charging of Electric Vehicles
No full textFull text access from Treasures at UT Dallas is restricted to current UTD affiliates (use the provided Link to Article).This paper proposes a novel bidirectional single-phase single-stage ac-dc converter for Electric Vehicle (EV) charging application. AC side of the proposed converter has current-fed half-bridge converter that is connected to the full-bridge converter on secondary side of a high-frequency transformer. Current at the input of the ac side can be regulated to realize power factor correction. The proposed converter achieves Zero Current Switching of primary side switches and zero current turn-ON for secondary side devices throughout the operation without any additional components. This paper also presents novel modulation technique and control algorithm to ensure soft switching throughout the operation range of the converter in both directions of power flow. Design equations are derived to help suitable selection of components for a given specification. Design of the converter, control strategy, and the results are presented for a 1.5-kVA converter for EV charger. © 2017 IEEE.This work was supported by the Qatar National Research Fund through NPRP under Grant NPRP 8-627-2-260.Erik Jonsson School of Engineering and Computer Scienc
Asystasia venui Anant Kumar, G. Krishna & Av. Bhattacharjee 2023, sp. nov.
No full textAsystasia venui Anant Kumar, G. Krishna & Av. Bhattacharjee sp. nov. FIGURES 2 & 3 Type:— INDIA. West Bengal, Howrah, Acharya Jagdish Chandra Bose Indian Botanic Garden, along bank of Janardanam Lake, 11.3 m, 22.55856° E & 88.29227° N, 20.11.2019, Anant Kumar, Gopal Krishna & Avishek Bhattacharjee 86184 (Holotype CAL, CAL0000033886; isotype CAL, CAL0000033887!). Diagnosis:— Asystasia venui is morphologically allied to A. atroviridis Anderson (1867: 526), but differs in having smaller calyx lobes (vs. longer calyx lobes); papillose ovary (vs. glandular hairy ovary); glabrous style throughout (vs. style pubescent basally); densely glandular pubescent capsules (vs. glabrous capsules). Description:—Erect or decumbent herbs, 30−60 cm high; stem purplish red, branched, quadrangular, sulcate, ribbed after drying, rooting at nodes on lower portion, pubescent when young, then glabrescent when old except for nodes. Leaves opposite, decussate, petiolate or uppermost pair sessile; petioles (0−) 0.5−8 cm long, sulcate, pubescent; lamina elliptic-ovate to elliptic-lanceolate, uppermost pair ovate to broadly ovate, smaller in size, 1.4−10 × 0.9−4.4 cm, chartaceous, base unequal, rounded, subcordate, attenuate, or decurrent onto petiole when young, margin entire, apex shortly acuminate, pubescent and green above, tuberculate, glabrous and whitish beneath, veins camptodromous, midvein prominent, impressed above, prominent below, pubescent, lateral veins 5−7 pairs, otherwise same as mid vein. Inflorescences terminal, condensed racemes, 1–4 cm long, 4−12-flowered, pubescent. Flowers ca. 2 cm across; pedicels slender, 1−1.2 cm long, pubescent. Bracts triangular, 1.2–1.5 mm long, apex acuminate, margin ciliate persistent; bracteoles ovate-lanceolate, 0.5–0.7 mm long, apex acute, margin ciliate, persistent. Calyx 5-lobed, pubescent and glandular-hairy outside, glabrous inside; tube 1–1.5 mm long; lobes linear-lanceolate, 3−3.5 mm long, apex acute. Corolla infundibuliform, ventricose, white, with a light violet-purple blotch on the middle lobe of lower lip, glandular-hairy outside, glabrous inside; tube 2–2.3 cm long, base cylindrical for 1.5–1.7 cm long, throat 5–6 mm long; lobes 5, elliptic-ovate, 5−7 × 4–4.5 mm, apex obtuse. Stamens 4, didynamous, inserted at base of throat, slightly exserted; filaments white, slender, shorter pair 5−5.5 mm long, longer pair 8−8.5 mm long, connate at the base in pairs, glabrous; anthers white with a vertical violet-black band on the sides, oblong, 1.2–1.5 cm long, spurred at base, connective beyond the anther cells, glabrous. Ovary green, oblong or columnar, compressed, 1.2−1.5 mm long, papillose, basally surrounded by fleshy, dull white, nectariferous disc, 2-celled; ovules 2 in each cell; style white, filiform, 2.4–2.6 cm long, glabrous; stigma shortly 2-lobed, smooth. Capsules green, clavate, compressed, 1.4–2.2 cm long, dehiscent, densely glandular hairy. Seeds 4, suborbicular, flattened, ca. 3 mm across, tuberculate, rugose, dentate along margins, borne on ca. 2 mm long, hook-like retinacula. Phenology:—Flowering and fruiting from September to December. Habitat: — The new species grows along lakes in shady area at an elevation of about 10 m. The association includes Rivina humilis L., Ruellia tuberosa L., Cardiospermum halicacabum L., Mikania micrantha Kunth and Plumbago zeylanica L. and grasses etc. Distribution:—The species is distributed in Howrah, West Bengal, India so far. Etymology:—The new species is named after Dr Potharaju Venu, Former Senior Scientist of Botanical Survey of India, for his significant contribution to the taxonomy of Indian Acanthaceae. Notes:— The Indian species of the genus can be categorized in two groups on the basis of shape of corolla tube, i.e. Group 1 comprises three species Asystasia atroviridis Anderson (1867: 526), A. neesiana (Wallich 1830: 73) Nees (1832: 89), A. venui Anant Kumar, G. Krishna & Av. Bhattacharjee sp. nov. having cylindrical, shortly funnelshaped corolla tube upwards, and Group 2 having 10 species A. chelonoides Nees (1832: 89), A. crispata Bentham (1852: 647), A. dalzelliana Santapau (1948: 276), A. gangetica (Linnaeus 1756: 3) Anderson (1860: 235), A. indica H.J. Chowdhery & Av. Bhattacharjee (2006: 211), A. macrocarpa Nees (1832: 89), A. mysorensis (Roth 1821: 303) Anderson (1867: 524), A. pusilla C.B. Clarke (1889: 55), A. travancorica Beddome (1872: 39), and A. variabilis (Nees 1847: 165) Trimen (1895: 324) with tubular-ventricose corolla tube (FIGURE 1). Out of these, five species are endemic to India, e.g., A. crispata, A. dalzelliana, A. indica, A. pusilla, and A. travancorica. Lindau (1895) erected a new genus Asystasiella Lindau (1895: 326) to accommodate the species of Group one with two species, viz. A. neesiana and A. atroviridis, and it was considered to be different from Asystasia by having a narrow cylindric corolla tube and stachel pollen (spheroidal with spines). Ensermu et al. (1992) discussed the delimitation of the genus based on pollen morphology. Since, the genus Asystasia encompasses considerable variation in inflorescence form, corolla morphology, and pollen type, therefore, the genus Asystasiella was included within Asystasia (Manzitto-Tripp et al. 2022). The generic circumscription of Asystasia, Asystasiella, Mackaya and other related genera should be delimitated by molecular phylogenetic study along with pollen morphology. Das (1939: 408) incorrectly transferred these three species from Asystasia to Mackaya as M. atroviridis (Anderson 1867: 526) Das (1939: 448), M. macrocarpa (Nees 1832: 89) Das (1939: 447), and M. neesiana (Wallich 1830: 73) Das (1939: 447), respectively. However, the genus Mackaya is characterized by two fertile stamens without spurs and with two staminodes, while Asystasia has all four fertile stamens with spur at the base of anthers. Deng and Wu (2009: 308) stated that these three species were quite different from Mackaya in having four stamens and they preferred to place them in Asystasia rather than in Mackaya. Based on the above mentioned reasons the new species fits with Asystasia instead of Mackaya and hence, we are describing it here under Asystasia. The new species was wrongly identified as Asystasia chelonoides Nees by Chowdhery and Pandey (2007). However, it can be easily distinguished from Asystasia chelonoides by its long tubular-cylindrical corolla and densely flowered racemes. Comparison of diagnostic characters of the new species with its most allied species is provided in detail in Table 1. Additional specimens examined (Paratypes):— INDIA. West Bangal: Acharya Jagdish Chandra Bose Indian Botanic Garden, along bank of Janardanam Lake, 10 m, 22.55847° E & 88.29214° N, 23.11.2020, Anant Kumar, Gopal Krishna & Avishek Bhattacharjee 86185 (CAL); Acharya Jagdish Chandra Bose Indian Botanic Garden, along bank of Janardanam Lake, 11 m, 22.55862° E & 88.29233° N, 20.11.2018, Anant Kumar, Gopal Krishna & Avishek Bhattacharjee 81601 (CAL); Acharya Jagdish Chandra Bose Indian Botanic Garden, Division 9, 12 m, 22.55746° E & 88.29357° N, 23.09.2010, Avishek Bhattacharjee 72736 (CAL).Published as part of Kumar, Anant, Krishna, Gopal & Bhattacharjee, Avishek, 2023, Asystasia venui (Justicieae: Acanthaceae): A new species from West Bengal, India, pp. 239-247 in Phytotaxa 600 (4) on pages 241-244, DOI: 10.11646/phytotaxa.600.4.3, http://zenodo.org/record/809394
sj-docx-1-pie-10.1177_09544089221143887 - Supplemental material for Experimental investigation on magnetorheological fine finishing of EN-8 steel alloy mold surface for cylindrical plastic bottle caps
No full textSupplemental material, sj-docx-1-pie-10.1177_09544089221143887 for Experimental investigation on magnetorheological fine finishing
of EN-8 steel alloy mold surface for cylindrical plastic bottle caps by Sunil Kumar Paswan, Kunal Arora and Anant Kumar Singh in Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering</p
sj-docx-1-pie-10.1177_09544089211050156 - Supplemental material for Investigation of magnetorheological fluid-based finishing process for improving the functional performance of hydraulic cylinder
No full textSupplemental material, sj-docx-1-pie-10.1177_09544089211050156 for Investigation of magnetorheological fluid-based finishing process for improving the functional performance of hydraulic cylinder by Sunil Kumar Paswan, Ankit Aggarwal and Anant Kumar Singh in Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering</p
sj-docx-2-pie-10.1177_09544089211050156 - Supplemental material for Investigation of magnetorheological fluid-based finishing process for improving the functional performance of hydraulic cylinder
No full textSupplemental material, sj-docx-2-pie-10.1177_09544089211050156 for Investigation of magnetorheological fluid-based finishing process for improving the functional performance of hydraulic cylinder by Sunil Kumar Paswan, Ankit Aggarwal and Anant Kumar Singh in Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering</p
Brachystemma calycinum var. emarginatum Anant Kumar 2023, var. nov.
No full text<i>Brachystemma calycinum</i> var. <i>emarginatum</i> Anant Kumar, <i>var</i>. <i>nov</i>. (Fig. 1) <p> <b>Type:</b> — INDIA. West Bengal, Alipurduar, Buxa Wildlife Sanctuary, Tashigaon to Rovers point, 12 February 2014, <i>Kumar 59917</i> (holotype CAL!, isotype CAL!).</p> <p> <b>Diagnosis:</b> — <i>Brachystemma calycinum</i> var. <i>emarginatum</i> differs from <i>B. calycinum</i> var. <i>calycinum</i> by densely pilose bracts; petals elliptic-oblong to elliptic-lanceolate, emarginate or bifid at apex, about equal to sepals in length; about 3 times as long as broad; stamens equal to staminodes.</p> <p> <b>Etymology:</b> —The epithet ‘ <i>emarginatum’</i> refers to emarginate or bifid petals, one of the diagnostic features that differentiate the new variety from proper variety.</p> <p> <b>Flowering & fruiting times:</b> —January–April.</p> <p> <b>Habitat:</b> —The new variety grows in shrubs dominated by <i>Maesa indica</i> (Roxburgh 1824: 230) Sweet (1826: 268) in open places in semi-evergreen hill forests, and on hedge plants and tea plantations.</p> <p> <b>Distribution:</b> — India in West Bengal (Buxa Wildlife Sanctuary, Alipurduar and Neora Valley National Park, Kalimpong).</p> <p> <b>Other specimens examined:</b> — <i>Brachystemma calycinum</i> var. <i>emarginatum</i>. INDIA: <b>West Bengal</b>, Neora Valley National Park, Asalay, 27.015517N & 88.759635E, 589.3m, 22.02.2020, <i>Ranjan, Krishna & Kumar 86862</i> (Paratype, CAL!).</p> <p> <i>Brachystemma calycinum</i> var. <i>calycinum</i>. INDIA: <b>Sikkim Terai</b>, Rhishop, <i>Hb. J. And.</i> 14 February 1867, <i>without collector’s name s.n.</i> (CAL!, Acc. no. 41507); <b>Assam</b>, Kobo, 01 December 1911, <i>Burkill 35944</i> (CAL!, Acc. no. 41514); <b>Assam</b>, Robong, 1400m, 24 December 1911, <i>Burkill 37353</i> (CAL!, Acc. no. 41512); <b>Manipur</b>, Ukhrul, 6000ft, 10 March 1948, <i>S. K. Mukerjee 2431</i> (CAL!); <b>Mizoram</b>, Vansil, Lushai hills, year of collection not readable, <i>Mann s.n.</i> (CAL!, Acc. no. 41516).</p> <p> <b> Note on the type of <i>Brachystemma calycinum</i>:</b> — Don (1825: 216) described the genus <i>Brachystemma</i> and listing one species (<i>B. calycinum</i> D.Don) which is therefore the generitype of the genus (see Art. 10.1-Note 1 of ICN). Don (1825), after a detailed description reported “Hab. in Nepalia. Wallich” so referring to a Wallich’s collection. According to Stafleu and Cowan (1988: 38), Don’s <i>Prodromus</i> is based on Wallich’s specimens preserved at BM, CGE, FI, LINN (Smith’s Herbarium), and PR and “perhaps in various other herbaria”. I traced 7 Wallich’s specimens at BM, CAL, E, and K. Wallich (1829 –1849) mentioned two localities (Napalia and Pandua) in his “Numerical List” but Don (1825) described the genus based on specimens collected from Nepal. Hence, only 4 out of 7 specimens found (those collected in Nepal) can be considered as original material for <i>B. calycinum</i>. They are: K000568116 (http://apps. kew.org/herbcat/getImage.do?imageBarcode=K000568116), K000568119 (http://apps.kew.org/herbcat/getImage. do?imageBarcode=K000568119), BM000583343, and E00317572. Hara & Williams (1979: 53) reported “Wall. s.n., ann. 1819” as a type of <i>B. calycinum</i>. According to the Art. 7.11 of ICN (see also Prado <i>et al.</i> 2015) these two authors inadvertently lectotypified Don’s name.</p>Published as part of <i>Kumar, Anant, 2023, A new variety of Brachystemma calycinum (Caryophyllaceae) from West Bengal, India with notes on its typification, pp. 259-263 in Phytotaxa 598 (3)</i> on page 260, DOI: 10.11646/phytotaxa.598.3.8, <a href="http://zenodo.org/record/7970024">http://zenodo.org/record/7970024</a>
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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