480,320 research outputs found
S-Band Class-C-F Power Amplifier with 2nd Harmonic Control at the Input
Get PDFPower amplifiers (PAs) are the most power-consuming devices in a transmitter. Their performance in efficiency is crucial to the efficiency of the whole system. Therefore, the issue of high efficiency PA has remained hot over the years. This paper presents an approach to design an S-band single stage class-F PA biased in class-C condition. Through the manipulation of the 2nd harmonic at the input, shaping the voltage waveform at the gate node, a class-F PA with proper output matching network (OMN) is realized. The proposed class-C-F PA achieved 60% drain efficiency (DE) and 36.3 dBm of output power around the 3 dB compression point. The methodology of taking the input non-linearity into consideration is also presented. Its feasibility has been verified through both the design and measurements
Erratum to: Effect of moderate red wine intake on cardiac prognosis after recent acute myocardial infarction of subjects with Type 2 diabetes mellitus (Diabetic Medicine, (2006), 23, 9, (974-981), 10.1111/j.1464-5491.2006.01886.x)
No full textIn an article by Marfella et al, the author name C. Saron is incorrect and should be listed as C. Sardu. Therefore the correct author list is: R. Marfella, F. Cacciapuoti, M. Siniscalchi, F. C. Sasso, F. Marchese, F. Cinone, E. Musacchio, M. A. Marfella, L. Ruggiero, G. Chiorazzo, D. Liberti, G. Chiorazzo, G. F. Nicoletti, C. Sardu, F. D'Andrea, C. Ammendola, M. Verza and L. Coppola.In an article by Marfella et al, the author name C. Saron is incorrect and should be listed as C. Sardu. Therefore the correct author list is: R. Marfella, F. Cacciapuoti, M. Siniscalchi, F. C. Sasso, F. Marchese, F. Cinone, E. Musacchio, M. A. Marfella, L. Ruggiero, G. Chiorazzo, D. Liberti, G. Chiorazzo, G. F. Nicoletti, C. Sardu, F. D'Andrea, C. Ammendola, M. Verza and L. Coppola
Berberis pengii C. C. Yu & K. F. Chung. A. Fruiting 2014, sp. nov.
No full text8. Berberis pengii C.C.Yu & K.F.Chung, sp. nov. (Figs. 7E–H, 13). Type:— TAIWAN. Pingtung: Taiwu, Kuaiku Lodge, 22°36’48”N, 120°44’39”E, 2150 m, 18 April 2011, Chih-Chieh Yu 683 (holotype TAI -284283!). Diagnosis: Berberis pengii is similar to B. aristatoserrulata, B. chingshuiensis, and B. mingetsensis in its leaf shape, differing from the latters by its narrow-triangular or triangular-oblong outer sepals and from the former by its globose berries. Evergreen shrub or small tree-like shrub, 1.5–4 m tall. Mature stems yellowish-brown, not verruculose. Spines 3-fid, concolorous, 0.8–1.8 cm. Leaves subsessile or sometimes with short petioles ca. 2–5 mm; leaf blade elliptic or narrowlyelliptic, abaxially pale green sometimes pruinose, adaxially shiny green; 4.4–8.9 × 1.4–2.6 cm, leathery; midvein abaxially raised and adaxially impressed, lateral veins slightly raised, the secondary veins pinnate, jointly looped and multi-festooned, the tertiary veins weakly reticulated; base cuniform, margins densely spinose with spinules of 13–27 with 1.5–3.5 mm apart on each side, apex acute or attenuate. Inflorescence a fascicle, 4–7-flowered. Bracts absent. Pedicel pale green, 0.4–1.6 cm. Bracteoles absent. Flowers yellow. Sepals in 3 whorls, outer sepals with midveins slightly raised yellow or reddish tinge narrowly-triangular or triangularly-oblong 5 × 1 mm, middle sepals yellow or reddish tinge ovate 7.5 × 2.5 mm, inner sepal yellow obovate 8 × 4 mm. Petals elliptic, 7 × 4 mm, base clawed with a pair of narrowly-ovoid nectaries very close to each other, apex acutely emarginated with margins slightly ragged. Stamens bright yellow ca. 5 mm, anther connective of stamen distinct, apex truncate. Pistil 5.5 mm long, usually red. Ovules 6 or 8. Berries black, globose or sub-globose ca. 10 × 10 mm, more or less pruinose, estylose. Phenology: — Flowering April–May; Fruiting April–June, October, November. Distribution & habitat: — Berberis pengii is large understory shrubs of 1–2 m tall commonly found in the coniferous and broad-leaved mixed forests in the southern Central Mountain Range at 2100 to 2500 m (Fig. 6B). Etymology:—The specific epithet is named in honor of Dr. Ching-I Peng, mentor and collaborator of the senior author, for his continuous guidance, supports, and friendship, and for his great contribution to the studies of Asian Flora. Chinese name: NJfi灣小ª Proposed IUCN conservation status: —Nearly Threatened. Berberis pengii is endemic to south Taiwan and its natural range is mostly within the range of national preservation areas. Therefore we propose a provisional IUCN category of NT for the species (IUCN 2012). Additional specimen examined: — TAIWAN. Kaohsiung: Dagueii Lake, 2150 m, 11 February 2009, Yu 338 (TAI), near the Blue Ghost Lake, 2400 m, 10 February 2009, Yu 339 (TAI), Juniper Camping Site, 2250 m, 12 February 2009, Yu 378 (TAI), the “Big Field” near Dagueii Lake, 2250 m, 10 February 2009, Yu 379 (TAI); near Camp Yukuting, 2400 m, 12 February 2009, Yu 355, 358 (TAI); Dona Logging Trail, 2100 m, 12 February 2009, Yu 347 (TAI). Pingtung: Peitawushan, 3000 m, 6 June 1988, Huang 13670 (TAI), 2400–2600 m, 30 November 1997, Liu 146 (TNM), 2500– 2900 m, 24 April 2008, Wu 165 (TNM); en route from the first Lodge to Chih-pen-chu-shan, 1900 m, 10 March 1990, Lin 408 (HAST); Pa-yu lake to Lakalakashan, 14 February 1993, Yang 30239 (HAST, PE); Kuaiku Lodge, 2250–2900 m, 2 April 1994, Chen 595 (HAST, TNM), 1600–2150 m, 9 October 2006, Wang 9342 (TNM), 2150 m, 18 April 2011, Yu 683 (TAI); Tamaru Camping Site, near Damumushan, 2200 m, 21 May 2009, Yu 325 (TAI); behind Nantawushan, 2500 m, 2 May 2009, Yu 330 (TAI); Linpalapalashan, 2300 m, 22 May 2009, Yu 377 (TAI). Taitong: near Shishuitoushan, 2300 m, 11 February 2009, Yu 341 (TAI).Published as part of Yu, Chih-Chieh & Chung, Kuo-Fang, 2014, Systematics of Berberis sect. Wallichianae (Berberidaceae) of Taiwan and Luzon with description of three new species, B. schaaliae, B. ravenii, and B. pengii, pp. 61-99 in Phytotaxa 184 (2) on pages 85-88, DOI: 10.11646/phytotaxa.184.2.1, http://zenodo.org/record/514650
Berberis ravenii C. C. Yu & K. F. Chung. A. Flowering 2014, sp. nov.
No full text9. Berberis ravenii C.C.Yu & K.F.Chung, sp. nov. (Figs. 14, 15). Type:— TAIWAN. Kaohsiung: Maolin, Shuangguie Lake Major Wild Life Habitat, Lake Upunuhu (Wan-shan-shen Lake), 22°54’53”N, 120°49’41”E, 2150 m, 7 February 2009, Chih-Chieh Yu 267 (holotype TAI-284282!). Diagnosis: Berberis ravenii differs from all Taiwanese species of sect. Wallichianae in having purplish or red mature shoots of the first year, and lanceolate to narrowly-lanceolate leaves. It is similar to B. mingetsensis, differing from the latter by its sparsely spinose margin of leaves with 17–28 spinules, and between each is 2–3 mm apart (v.s. leaf margins remotely spinose, with 6–16 spinules of 3–9 mm apart). Small evergreen shrub, more or less decumbent, 0.5–1 m tall. Mature stems purplish red, terete, not verruculose. Spines 3-fid, concolorous, 0.8–2.3 cm. Leaves subsessile; leaf blade elliptic to lanceolate, abaxially green or dark green not pruinose, adaxially green or dark-greenish; 5.5–9.5 × 1.2–2.0 cm, slightly leathery; midvein abaxially raised and adaxially impressed, lateral veins slightly raised, the secondary veins pinnate, jointly looped and muliti-festooned, the tertiary veins reticulate; base cuneate, margins sometimes slightly revolute and remotely spinose with spinules of 16–28 with 2–3 mm apart on each side, apex acuminate or mucronate. Inflorescence a fascicle, 4–7-flowered. Bracts absent. Pedicel pale green, 1.3–1.5 cm. Bracteoles absent or 2, pale yellow or greenish-yellow triangular 1 × 1 mm. Flowers pale yellow, greenish-yellow. Sepals in 3 whorls, outer sepals yellow or reddish tinge or pale green ovate 2.5 × 2 mm, middle sepals yellow ovate 4 × 2.5 mm, inner sepals yellow obovate 5 × 4.5 mm. Petals obovate, 4.5 × 3 mm, base clawed with a pair of ovoid nectaries close to each other, apex incised. Stamens pale yellow ca. 3 mm, anther connective of stamen distinct, apex truncate. Pistil 4 mm long. Ovules 2 or 3. Berries black, ellipsoid ca. 7 × 4 mm, not pruinose, estylose. Phenology: — Flowering April; Fruiting February. Distribution & habitat: — Berberis ravenii occurs in the coniferous and broadleaved mixed forests of Shuanggui Lake Major Wildlife Habitat of southern Central Mountain Range at 1400 to 2300 m (Fig. 6A & 6D). Etymology:—The specific epithet commemorates Dr. Peter H. Raven, mentor of the senior author, for his enduring support, guidance, and encouragement, and for his tremendous contribution to botanical research and the conservation of global biodiversity. Chinese name: ⁂武小ª Proposed IUCN conservation status: —Data Deficient (DD). Berberis ravenii is currently known only from the mid-elevation cloud forests in Shuanggui Lake Major Wildlife Habitat and its precise distributional range remains to be explored (IUCN 2012). Additional specimen examined:— TAIWAN. Kaohsiung: Chunyunshan, 700 m, 7 March 1996, Liou 5 ( TAIF); mountains near Lake Dalubaling, 2150 m, 8 February 2009, Yu 265, 277, 279 (TAI); Peak 2080 near Lake Upunuhu, 2080 m, 6 February 2009, Yu 271 (TAI); Shihsueitoushan Front Peak, 2200 m, 7 February 2009, Yu 282 (TAI); Lake Upunuhu, 2150 m, 7 February 2009, Yu 287, 293 (TAI); Damumushan, 2400 m, 21 May 2009, Yu 322, 323 (TAI). Pingtong: Chutunshan Japanese Subpolice Office, 12 August 1937, Ito 516 (TAI); Kuaiku, 23 January 1988, Kuoh 13554 (TNM); en route to Tawushan, 2100-3090 m, 16-17 July 1988, Huang et al. 13678 (TAI); Linpalapalashan, 2300 m, Apr. 2008, Yu 127, 130, 132, 134, 327 (TAI); Wantoulanshan, 1900 m, 6 February 2009, Yu 289 (TAI); Paiwanese historical trail (south line), 1400 m, 27 December 2009, Yu 269, 270, 272, 276, 362 (TAI); Southern flank Wutoushan, 2000 m, 28 December 2009, Yu 380 (TAI); trail to North peak of Tawushan, 2305 m, 29 December 2009, Yu 278, 294, 299 (TAI); near South peak of Tawushan, 2200 m, 2 May 2009, Yu 329 (TAI).Published as part of Yu, Chih-Chieh & Chung, Kuo-Fang, 2014, Systematics of Berberis sect. Wallichianae (Berberidaceae) of Taiwan and Luzon with description of three new species, B. schaaliae, B. ravenii, and B. pengii, pp. 61-99 in Phytotaxa 184 (2) on page 88, DOI: 10.11646/phytotaxa.184.2.1, http://zenodo.org/record/514650
Two-stage Class F-C Power Amplifier with an Optimum 2nd Harmonic Control at the Power Stage Input
No full textThis paper presents a two stage Class F-C power amplifier working at S-band. It achieves PAE larger than 60% and an output power of 36 dBm over frequency range 2.27 GHz to 2.44 GHz. The harmonic injection approach is used into the design. By introducing an additional driver stage and a proper inter-stage matching network, the optimum ratio between the 2nd harmonic and the fundamental one is obtained at the gate of power stage, in order to realize a Class F-C PA. The design procedure and the feasibility of harmonic manipulation at the input of the relevant stage is also presented in this paper
Some formulas for the Appell function F 1 (a, b, b′; c; w, z)
No full textSome new relations for the Appell function F 1 (a, b, b′; c; w, z) are obtained including differentiation and integration formulas, integral representations, series and recurrence relations. Some integrals are given which can be expressed in terms of F 1 and confluent Appell functions (Humbert functions) Φ1, Φ2, Φ
REDESCRIPTION AND SYSTEMATIC STATUS OF NEOCAPILLARIA PHOXINI YU ET WANG, 1994 (NEMATODA: CAPILLARIIDAE)
No full textRe-examination of the syntypes of the capillariid nematode Neocapillaria phoxini Yu et Wang, 1994, the type species of Neocapillaria Yu et Wang, 1994, described from the intestine of the freshwater fish Phoxinus lagowskii variegatus Gunther (Cyprinidae) from China, confirmed its morphological similarity with species of Freitascapillaria Moravec, 1987, to which it is transferred as Freitascapillaria phoxini (Yu et Wang, 1994) comb. n. Consequently, Neocapillaria Yu et Wang, 1994 (a homonym to Neocapillaria Moravec, 1987) and Sinocapillaria Moravec et Spratt, 1998 become junior synonyms of Freitascapillaria. Skrjabinocapillaria gigantea is transferred to Freitascapillaria as F. gigantea (Wang, 1984) comb. n.Re-examination of the syntypes of the capillariid nematode Neocapillaria phoxini Yu et Wang, 1994, the type species of Neocapillaria Yu et Wang, 1994, described from the intestine of the freshwater fish Phoxinus lagowskii variegatus Gunther (Cyprinidae) from China, confirmed its morphological similarity with species of Freitascapillaria Moravec, 1987, to which it is transferred as Freitascapillaria phoxini (Yu et Wang, 1994) comb. n. Consequently, Neocapillaria Yu et Wang, 1994 (a homonym to Neocapillaria Moravec, 1987) and Sinocapillaria Moravec et Spratt, 1998 become junior synonyms of Freitascapillaria. Skrjabinocapillaria gigantea is transferred to Freitascapillaria as F. gigantea (Wang, 1984) comb. n
Synthesis and spectroscopic characterization of a series of substituted cyclopentadienyl Group 4 fluorides; crystal structure of the acetylacetonato complex [(acac) 2 (??-C 5 Me 5 )Zr(??-F)SnMe 3 Cl]
No full textA series of mono- and di-substituted cyclopentadienyl Group 4 fluorides [Ti{eta-C(5)H(3)R(R')-1,3}F-n(m)], (n = m = 2 and n = 1, m = 3; R = H or SiMe(3); R' = H, Me or SiMe(3)), [Ti(eta-C(5)Me(5))(2)F-2] and [Zr(eta-C5H5)(2)F-2] have been-prepared via the reaction of the corresponding chlorides with SnMe(3)F. The compounds have been characterized by means of H-1 and F-19 NMR, IR and mass spectroscopy and chemical analyses. The solvent dependence of the reactions using SnMe,F is discussed. To demonstrate the wide applicability of this fluorinating system the acetylacetonatofluoro complex [(acac)(2)(eta-C(5)Me(5))Zr(eta-F)SnMe(3)Cl] has been prepared and its crystal structure determined
Pristidia ramosa Yu, Sun & Zhang 2012
No full textPristidia ramosa Yu, Sun & Zhang, 2012 Figs 9–17 Pristidia ramosa Yu, Sun & Zhang, 2012: 45, f. 1–16. (male holotype; 6 male and 2 female paratypes from China, Jiangxi Province, Mt. Jinggang) Clubiona expansa Huang & Chen, 2012: 55, f. 15A–G. (male holotype; 1 male and 1 female paratypes from China, Taiwan Province, New Taipei City). Syn. N. Material examined. CHINA: Taiwan, New Taipei City, District Pinglin (24o55’55.78"N, 121°42′41.10"E, 210m), 19 July 2013, F. Liu and W.Gan leg., 1 male (HUBU-TW- 130177) and 1 female (HUBU-TW- 130178); Guizhou, Mt. Fanjing, Taiping village (24o55’55.78"N, 121o42’41.10"E, 634m), 24 May 2015, M. Yan and J.Li leg., 1 female (HUBU-GZ- 150249). Diagnosis. Pristidia ramosa can be easily distinguished from P. cervicornuta sp. nov. by the embolus distinctly longer, the presence of basal teeth on the RTA, RTA expanded, with a blunt tip, and by the absence of TA (Figs 13, 14). Yu, Sun & Zhang (2012: 45) highlighted the differences of this species from P. prima. Description. See Yu, Sun & Zhang (2012). Intraspecific variation. There is almost no difference between the male from Taiwan (HUBU-TW- 130177, Figs 10, 12–14) and the holotype from Jiangxi (Yu, Sun & Zhang 2012: figs 1–7, 12–14). However, some intraspecific variation is exhibited by females from different localities, mostly related to different degrees of sclerotization. The female from Taiwan (HUBU-TW- 130178, Fig. 11) is distinctly larger in size and darker in color than the paratype from Jiangxi (Yu, Sun & Zhang, 2012: fig. 8). Furthermore, in HUBU-TW- 130178, the epigynal ventral plate is more sclerotized (Fig. 15) than in the paratype (Yu, Sun & Zhang 2012: fig. 9); both spermathecae and bursae are totally transparent in HUBU-TW- 130178 (Fig. 16), while more sclerotized in the paratype (Yu, Sun & Zhang 2012: figs 10, 16). Natural history. The spiders inhabit forests in low mountain areas (210–800 m). This is in accordance with data of the type locality provided by Yu, Sun & Zhang (2012) and Huang & Chen (2012). Distribution. Mt. Jinggang in Jiangxi, Mt. Fanjing in Guizhou and New Taipei City in Taiwan, China. The present data showed the extension of the known range of this species of about 560 km to the northwest (Mt. Fanjing) and of 750 km to the southeast (Taiwan) from the type locality (Fig. 17). Remark. Although we have not examined the type specimens of C. expansa, the long filiform embolus, the expanded RTV with a subapical flange, the bell-shaped atrium, and the course of vulvar duct system shown in the original illustrations (Huang & Chen 2012, fig. 15A–G), leave no doubts on this synonymy. Huang & Chen (2012) was published in May, 2012 (day of publication not specified), while Yu, Sun & Zhang (2012) was published in May, 3, 2012. According to the article 21.3 of the International Code of Zoological Nomenclature, the publication date of Huang & Chen (2012) must be specified as May, 31, 2012. Consequently, C. expansa is here considered as a junior synonym of P. ramosa.Published as part of Yu, Hao, Zhang, Jianshuang & Chen, Jian, 2017, Taxonomy of the genus Pristidia Deeleman-Reinhold, 2001 (Araneae: Clubionidae) in China, pp. 411-418 in Zootaxa 4306 (3) on pages 413-416, DOI: 10.11646/zootaxa.4306.3.7, http://zenodo.org/record/84452
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