2,813 research outputs found
A spectral-galerkin coarse-mesh approach to solving the two-dimensional multigroup diffusion equations
No full textBased on the spectral-Galerkin method and domain decomposition method, a novel coarse-mesh model (SGCM) has been developed for solving the two-dimensional multigroup neutron diffusion equations. In this study, the reactor domain is decomposed into subdomains (or coarse meshes). Within any individual subdomain, the neutron diffusion equations with the Robin boundary condition are first reformulated in a weak (variational) form, which is then solved by means of the Legendre-spectral method. As for interfacial coupling between subdomains, it is relaxed by an interfacial relation of discontinuity between incoming and outgoing partial currents if discontinuity factors are considered on subdomain interfaces. The resulting discretized system with block-sparse-structured matrix is solved by the block successive over-relaxation method (BSOR). The method was examined with two well-known PWR benchmark problems and a realistic reactor core. It turns out that the method can generate not only extremely accurate assemblywise average quantities, but also satisfactory smooth homogenized fluxes, and heterogeneous reconstructed pinwise fluxes, which results from the fact that all the formulations are derived in a variational form in which the admissible solution space consists of higher-order Legendre polynomials. (C) 1997 Elsevier Science Ltd
Lesteva concava Cheng & Li & Peng 2019, new species
No full textLesteva (s. str.) concava, Cheng, Li & Peng, new species (Figs 2B, 3 G–H, 5D–F, 24) Type material (64 exs). Holotype: CHINA: ♂: ‘ China: Zhejiang Prov., Lin’an City (临安市), Mt. Qingliang (清 凉峰), 1050–1080 m, 8–10.v.2005, Zhu & Li leg. ’ / HOLOTYPE (red), L. concava sp. nov., det. Cheng, Li & Peng, 2019, SNUC. Paratypes: CHINA: 17 ♂♂, 34 ♀♀: same label data as holotype / PARATYPE (yellow), L. concava sp. nov., det. Cheng, Li & Peng, 2019, SNUC; 1 ♀: ‘ China: Anhui Prov., Anqing City (安庆市), Qianshan County (潜山县), Mt. Tainzhu (天柱山), 1150–1250 m, 25.iv.2005, Hu & Tang leg. ’ / PARATYPE (yellow), L. concava sp. nov., det. Cheng, Li & Peng, 2019, SNUC; 1 ♀: ‘ China: Anhui Prov., Chizhou City (池州市), Shitai County (石台县), Guniujiang N. R. (牯牛降自然保护区), alt. 300 m, 27.iv.2005, Hu & Tang leg. ’ / PARATYPE (yellow), L. concava sp. nov., det. Cheng, Li & Peng, 2019, SNUC; 1 ♀: ‘ China: Zhejiang Prov., Hangzhou City (杭州 市), Anji County (安吉 县), Mt. Longwang (龙王 山), 300–500 m, 24.iv.2004, Jing-Wen Zhu leg. ’ / PARATYPE (yellow), L. concava sp. nov., det. Cheng, Li & Peng, 2019, SNUC; 2 ♀♀: ‘ China: Zhejiang Prov., Hangzhou City (杭州市), Anji County (安吉县), Mt. Longwang (龙王山), 250–550 m, 24.iv.2006, Jin-Wen Li leg. ’ / PARATYPE (yellow), L. concava sp. nov., det. Cheng, Li & Peng, 2019, SNUC; 2 ♀♀: ‘ China: Zhejiang Prov., Hangzhou City (杭州市), Anji County (安吉县), Mt. Longwang (龙王山), 1050–1200 m, 15.v.2013, Chen & Pan leg. ’ / PARATYPE (yellow), L. concava sp. nov., det. Cheng, Li & Peng, 2019, SNUC; 1 ♀: ‘ China: Zhejiang Prov., Lin’an City (临安市), Mt. Tianmu (天目山), 800–1150 m, 2.v.2001, Jiao-Yao Hu leg. ’ / PARATYPE (yellow), L. concava sp. nov., det. Cheng, Li & Peng, 2019, SNUC; 1 ♀: ‘ China: Zhejiang Prov., Lin’an City (临安市), Mt. Tianmu, (天目山), 800–1150 m, 31.v.2006, Hu & Tang leg. ’ / PARATYPE (yellow), L. concava sp. nov., det. Cheng, Li & Peng, 2019, SNUC; 1 ♂: ‘ China: Zhejiang Prov., Lin’an City (临安市), Mt. Tianmu, (天目山), 830–900 m, 31.v.2010, Wang, Xu & Zhu leg. ’ / PARATYPE (yellow), L. concava sp. nov., det. Cheng, Li & Peng, 2019, SNUC; 1 ♂, 1 ♀: ‘ China: Zhejiang Prov., Quzhou City (衢州市), Jingning County (景宁 县), Baiyunlinqu (白云林区), 1100–1270 m, 07.v.2012, Jian-Qing Zhu leg. ’ / PARATYPE (yellow), L. concava sp. nov., det. Cheng, Li & Peng, 2019, SNUC. Description. Measurements (in mm) and ratios: BL 3.04–3.29; FL 2.36–2.48; HL 0.47–0.50; HW 0.59–0.62; PL 0.56–0.59; PW 0.65–0.68; EL 1.27–1.33; EW 1.18–1.21; HL/HW 0.75–0.79; PL/PW 0.86–0.90; EL/EW 1.07–1.11; HW/PW 0.90–0.95; PL/EL 0.44–0.46; AnL 1.39–1.42; AeL 0.46–0.50. Habitus as in Fig. 2B. Reddish brown, head usually darker, blackish brown; mouthparts fuscous brown; antennae yellowish brown; elytra with small subtriangular yellow maculae near middle; legs reddish brown, except of paler apex of tibiae and tarsi. Pubescence of body pale, evident and recumbent. Head subtriangular, coarsely and sparsely punctate, widest across eyes; eyes prominent, 1.86 times longer than temples; ocelli distinct, distance between ocelli 1.75 times as long as distance between ocellus and posterior margin of eye. Antennae elongate, relative lengths of the antennomeres I–XI: 1.54: 1: 1: 1: 1: 1: 1.15: 1.15: 1.15: 1.15: 1.77. Pronotum subcordate, moderately convex, widest near anterior third; lateral margins arcuate at anterior twothirds and nearly straight at posterior third; punctation and pubescence as that on head; disc with shallow U-shaped depression. Scutellum subtriangular, surface with fine punctation and pubescence. Elytra subtrapezoidal, gradually dilated posteriorly, posterior angles broadly rounded; punctation and pubescence distinctly finer and sparser than those on pronotum. Abdomen broad, widest at segment IV (first visible abdominal segment), then distinctly narrowed posteriorly. Tergites with dense, fine punctation and decumbent pubescence, devoid of microsculpture; middle of the tergites IV and V with one pair of tomentose patches, but patches on tergite V smaller and less transverse. Male. Apical margin of the tergite VIII (Fig. 3G) broadly concave; sternite VIII (Fig. 3H) transverse, apical margin weakly concave; median lobe of the aedeagus (Figs 5 D–F) slightly longer than parameres; parameres somewhat asymmetrical, each slightly narrowed in anterior half, with three long apical setae; internal sac without sclerotized spines and without distinct dark membranous structures. Female. Abdominal sternite VIII without concavity apically. In other morphological characters similar with males. Comparative notes. Lesteva concava is closest to L. cooteri Rougemont in sharing similar body size, and punctation and pubescence of the head and pronotum. These two species can be readily separated by the different coloration of the body, and especially the narrower aedeagus with longer median lobe and narrower and longer parameres in L. concava. For illustrations of L. cooteri see Figs 6A, 8 A–B, 9A–C and Rougemont (2000: figs 1, 13). Distribution and nature history. China: Anhui, Zhejiang (Fig. 24). Some specimens were sifted from leaf litter near a stream in mixed deciduous forests at Mt. Tianzhu, Anhui. Etymology. The new specific epithet refers to the broadly concave apical margin of the male tergite VIII.Published as part of Cheng, Zhi-Fei, Li, Li-Zhen & Peng, Zhong, 2019, New species and new records of Lesteva Latreille, 1797 (Coleoptera Staphylinidae: Omaliinae) from China, pp. 1-39 in Zootaxa 4560 (1) on pages 5-9, DOI: 10.11646/zootaxa.4560.1.1, http://zenodo.org/record/262725
Allozyme variation of Cyclobalanopsis championii (Fagaceae), a narrowly distributed species in southern Taiwan.
No full textInclusion of biological factors in parallel architecture NTCP model for radiation-induced liver disease
No full textNaphthazarin and methylnaphthazarin cause vascular dysfunction by impairment of endothelium-derived nitric oxide and increased superoxide anion generation.
No full textGlypican-3-mediated oncogenesis involves the Insulin-like growth factor-signaling pathway.
No full textSphaeromacrops yunnanensis Tang & Cheng 2020, sp. n.
No full textSphaeromacrops yunnanensis Tang & Cheng sp. n. (Figs. 1–6) Type material. Holotype. China: Yunnan: ♂, glued on a card with labels as follows: “ China, Yunnan Prov., Xi- shuangbanna, Nabanhe A. R., Guomenshan, 26. IV.2009, Meng leg.” “ Holotype / Sphaeromacrops yunnanensis / Tang & Cheng” [red handwritten label] (SHNU). Paratypes. 1♂ 1♀, same data as for the holotype (SHNU); 2♂♂, Xishuangbanna, Nabanhe A. R., 18.VI.2009, Meng leg. (SHNU, NWM). Description. Body black, forebody with dark olive- green metallic lustre; antennal segments I–III reddish, segment IV reddish with base narrowly yellowish, segment V blackish with base narrowly yellowish, segment VI reddish to blackish with base narrowly yellowish, segment VII with base narrowly yellowish and remaining portion varying from black to white, segments VIII–XI white, sometimes the apical portion of the terminal segment may be darker; legs reddish; basisternum reddish; shoulders and deflexed portion of elytra reddish; abdominal segments with posterior margins and paratergites reddish. Measurements of male: BL: 11.2–11.4 mm, FL: 5.9–6.3 mm. HL: 1.72–1.81 mm, HW: 1.97–2.08 mm, EYL: 0.77–0.81 mm, TL: 0.72–0.74 mm, PL: 1.63–1.85 mm, PW: 1.38–1.47 mm, EL: 2.40–2.55 mm, EW: 2.25–2.40 mm. HW/HL: 1.11–1.16, TL/EYL: 0.91–0.93, PL/PW: 1.17–1.26, EL/EW: 1.06–1.07. Measurements of female: BL: 12.5 mm, FL: 7.0 mm. HL: 1.93 mm, HW: 2.32 mm, EYL: 0.89 mm, TL: 0.77 mm, PL: 1.89 mm, PW: 1.66 mm, EL: 2.84 mm, EW: 2.68 mm. HW/HL: 1.21, TL/EYL: 0.87, PL/PW: 1.14, EL/ EW: 1.06. Head subquadrate, tempora slightly narrowed behind eyes; eyes strongly and spherically prominent; portion between eyes with punctation longitudinally confluent, interstices narrow and smooth, forming long rugae and an indistinct midline, two admedian impunctate patches at level of half-length of eyes; posterior half of head with punctures more or less regular and very dense, those near the posterior margin of head transversely confluent, interstices reduced to sharp ridges; pubescence of head fine, brownish with some modified silvery setae on vertex; antennal segment I distinctly longer than segment III, segment IV distinctly oblong, segments V and VI slightly longer than segment IV, segments VII–IX slightly wider than segment VI, segment X slightly shorter than segment IX, segment XI slightly longer than segment IX. Pronotum with punctation and interstices similar to those of posterior portion of head, pair of admedian impunctate patches very indistinct, as wide as diameter of punctures, posterior medial impunctate patch well developed, anterior half with scattered punctures and posterior half smooth; pubescence mostly brownish with some grouped white setae forming several indistinct tomentose patches; scutellum densely punctate, posterior half with cluster of dark setae. Elytra with punctation and interstices similar to those of pronotum, though punctures are slightly smaller in average and interstices near posterior margin distinctly larger; pubescence mostly brownish with some grouped white setae forming several tomentose patches. Abdominal tergites III–V with pair of slightly divergent accessory basal lines; tergite VIII with posterior margin hardly emarginated at middle; tergites III, IV and VIII covered with white fur-like pubescence, tergite V with pair of dark tomentose dots at middle surrounded with white fur-like pubescence, tergite VI with dark heart-shaped tomentose patch at middle decorated with some white setae along its lateral sides, tergite VII with white tomentose patch at middle, not reaching the lateral sides of tergite, middle of posterior margin of this patch connected to dark longitudinal tomentose patch, styli covered with white fur-like pubescence on dorsal surface. Front legs with tarsomere V slightly longer than tarsomeres IV and III combined. Male. Sternite VIII emarginated at middle of posterior margin, sternite IX (Fig. 3) emarginated at middle of posterior margin. Aedeagus (Figs. 4, 5) slender, median lobe with apical portion slightly asymmetrical; paramere as long as median lobe, bent to left side in ventral view, apical portion (Fig. 6) truncated and bearing two groups of peg setae along the inside of the lateral margin. Female. Sternite VIII with posterior margin broadly rounded. Distribution. China (Yunnan). Remarks. The new species can be easily distinguished from other species by the posterior margin of abdominal tergite VIII without distinct emargination at middle. It can also be distinguished from S. antennalis (Cameron, 1932) and S. nepalensis Schillhammer, 2001 by the much smaller body size, and from S. strigosifrons Schillhammer, 2001, S. varicornis (Coiffait, 1977) and S. gracilis Schillhammer, 2001 by the indistinct admedian patches of the pronotum. Etymology. The specific name is derived from “ Yunnan ”, the type locality of the species.Published as part of Tang, Liang & Cheng, Zhi-Fei, 2020, Sphaeromacrops Schillhammer new to China with description of a new species (Coleoptera, Staphylinidae), pp. 297-300 in Zootaxa 4779 (2) on pages 298-300, DOI: 10.11646/zootaxa.4779.2.11, http://zenodo.org/record/383346
Lesteva elongata Cheng & Li & Peng 2019, new species
No full text<i>Lesteva</i> (<i>s. str.</i>) <i>elongata</i> Cheng, Li & Peng, new species <p>(Figs 11A, 13 A–B, 14A–C, 34)</p> <p> <b>Type material</b> (31 exs). <b>Holotype: CHINA:</b> ♂: ‘ China: Zhejiang Prov., Lin’an City (临安市), Mt. Qingliang (清 凉峰), alt. 1080 m, 9–10.v.2005, Zhu & Li leg. ’ / HOLOTYPE (red), <i>L. elongata</i> <b>sp. nov.</b>, det. Cheng, Li & Peng, 2019, SNUC. <b>Paratypes: CHINA:</b> 9 ♂♂, 15 ♀♀: same label data as holotype / PARATYPE (yellow), <i>L. elongata</i></p> <p> <b>sp. nov.</b>, det. Cheng, Li & Peng, 2019, SNUC; 1 ♂, 4 ♀♀: ‘ China: Zhejiang Prov., Lin’an City (临安市), Mt. Tianmu (天目 山), 800–1150 m, 19.v.2006, Hu & Tang leg.’ / PARATYPE (yellow), <i>L. elongata</i> <b>sp. nov</b>., det. Cheng, Li & Peng, 2019, SNUC; 1 ♀: ‘ China: Zhejiang Prov., Lin’an City (临安市), Mt. East Tianmu (东天目山), 1050–1150 m, 13.iv.2011, Peng & Zhu leg.’ / PARATYPE (yellow), <i>L. elongata</i> <b>sp. nov</b>., det. Cheng, Li & Peng, 2019, SNUC.</p> <p> <b>Description.</b> Measurements (in mm) and ratios: BL 2.76–3.16; FL 2.14–2.42; HL 0.37–0.44; HW 0.53–0.59; PL 0.50–0.59; PW 0.62–0.68; EL 1.15–1.30; EW 1.09–1.21; HL/HW 0.63–0.82; PL/PW 0.80–0.90; EL/EW 1.06–1.17; HW/PW 0.85–0.90; PL/EL 0.41–0.47; AnL 1.32–1.34; AeL 0.43–0.47.</p> <p>Habitus as in Fig. 11A. Blackish brown; antennae and ocelli testaceous; elytra with distinct oblique testaceous maculae extending from the humeral angle to the suture at middle; femora fuscous, tibiae paler, tarsi yellowish. Body with pale pubescence, evident and recumbent.</p> <p>Head subtriangular, coarsely and sparsely punctate, widest across eyes; eyes moderately convex, 1.71 times longer than temples; ocelli distinct, distance between ocelli slightly more than twice as long as distance between ocellus and inner margin of eye. Antennae elongate, relative lengths of the antennomeres I–XI: 1.58: 1: 1.08: 1.08: 1.08: 1.17: 1.17: 1.08: 1.08: 1: 1.92.</p> <p>Pronotum subcordate, moderately convex and transverse, widest at anterior middle; lateral margins arcuate at anterior two-thirds and nearly straight at posterior third; punctation and pubescence similar to that on head; disc with shallow U-shaped depression. Scutellum subtriangular, surface with fine punctation and pubescence.</p> <p>Elytra subtrapezoidal, gradually dilated posteriorly, posterior angles broadly rounded; punctation and pubescence distinctly finer and sparser than those on pronotum.</p> <p>Abdomen broad, widest at segment IV (first visible abdominal segment) then narrowed posteriorly; surface of tergites closely covered with very fine punctation, without microsculpture; tomentose patches on first exposed tergite V small and less transverse.</p> <p>Male. Apical margin of the tergite VIII (Fig. 13A) truncate; sternite VIII (Fig. 13B) transverse, apical margin strongly concave; median lobe of the aedeagus (Figs 14 A–C) distinctly shorter than parameres, narrowing toward the apex; parameres somewhat asymmetrical, each slightly narrowed in anterior half, with four long apical setae; internal sac without sclerotized spines and without distinct dark membranous structures.</p> <p>Female. Abdominal sternite VIII without concavity apically. In other morphological characters similar with males.</p> <p> <b>Comparative notes.</b> Based on the body size and coloration, as well as on the punctation and pubescence, the new species is most similar to <i>L. erythra</i> Ma, Li & Zhao from which it differs by the coloration of the legs, by the shape of maculae on elytra and morphology of the aedeagus. For illustrations of <i>L. erythra</i> see 11B, 13C–D, 14D–F and Ma, Li & Zhao (2012a: figs 2, 6–8).</p> <p> <b>Distribution and natural history.</b> China: Zhejiang (Fig. 34). Some specimens were sifted from moss on rocks near a stream in mixed deciduous forests at Mt. East Tianmu, Zhejiang.</p> <p> <b>Etymology.</b> The specific epithet alludes to the elongated parameres of the aedeagus.</p>Published as part of <i>Cheng, Zhi-Fei, Li, Li-Zhen & Peng, Zhong, 2019, New species and new records of Lesteva Latreille, 1797 (Coleoptera Staphylinidae: Omaliinae) from China, pp. 1-39 in Zootaxa 4560 (1)</i> on pages 12-17, DOI: 10.11646/zootaxa.4560.1.1, <a href="http://zenodo.org/record/2627254">http://zenodo.org/record/2627254</a>
Lesteva obesa Cheng & Li & Peng 2019, new species
No full textLesteva (s. str.) obesa Cheng, Li & Peng, new species (Figs 16A, 18 A–B, 19A–C, 34) Type material (1 ex.). Holotype: ♂: ‘ China: Chongqing City (重庆市), Chengkou County (城口县), Mt East Dabashan (东大巴山), upper Huang’an Gou (黄安沟), N31.51.785, E109.09.459, alt. 2039 m, 22–23.iv.2008, Hao Huang & Wang Xu leg. ’ / HOLOTYPE (red), L. obesa sp. nov., det. Cheng, Li & Peng, 2019, SNUC. Description. Measurements (in mm) and ratios: BL 2.50; FL 1.72; HL 0.41; HW 0.53; PL 0.53; PW 0.60; EL 1.13; EW 1.29; HL/HW 0.77; PL/PW 0.88; EL/EW 0.88; PL/EL 0.82; AnL 1.38; AeL 0.50. Habitus as in Fig. 16A. Reddish brown, head usually darker, blackish brown; mouthparts and antennae fuscous brown; elytra reddish brown, but lateral and posterior margin paler; elytra with obscure oblique dark red maculae, extending from shoulders toward suture in middle of the elytra; femora fuscous brown, tibiae paler, tarsi yellowish brown. Pubescence of body pale, evident and recumbent. Head subtriangular, with very coarse and dense punctation, widest across eyes; eyes moderately large and prominent, twice as long as temples; ocelli distinct, distance between ocelli 1.22 times as long as distance between ocellus and inner margin of the compound eye. Antennae elongate, relative lengths of the antennomeres I–XI: 1.54: 1: 1: 1.08: 1.08: 1.08: 1: 1: 1: 1: 1.77. Pronotum subcordate, distinctly convex, moderately transverse widest near anterior third; lateral margins arcuate at anterior two-thirds and nearly straight at posterior third; punctation and pubescence coarser and sparser than those on head; disc with shallow U-shaped impression. Scutellum subtriangular, with fine and sparse punctation and pubescence. Elytra subtrapezoidal, gradually dilated posteriorly, posterior angles broadly rounded; punctation and pubescence distinctly finer and sparser than those on pronotum. Abdomen broad, widest at segment IV (first visible abdominal segment) then narrowed posteriorly; surface of tergites somewhat closely covered with very fine punctation and pubescence, without microsculpture; tergite V with a pair of large and moderately transverse tomentose patches. Male. Apical margin of the tergite VIII (Fig. 18A) weakly concave; sternite VIII (Fig. 18B) transverse, apical margin strongly concave. Median lobe of the aedeagus (Figs 19 A–C) significantly wide basally, narrowing toward apex, slightly longer than parameres; parameres somewhat asymmetrical, with four short apical setae. Female. Unknown. Comparative notes. Based on the coloration of the body, punctation and pubescence of the head and pronotum and shape of the median lobe of the aedeagus, the new species is most similar to L. qinlingmontis Rougemont (Shaanxi: Qinling Shan), from which it can be distinguished by a shallow U-shaped impression on the disc of the pronotum, shapes of the elytra and slender parameres. For illustrations of L. qinlingmontis see Rougemont. (2017: 3, 3a). Distribution and natural history. The type locality is situated in Mt. East Dabashan to the Chengkou County, northern Chongqing, near Shaanxi Province (Fig. 34). The specimen was sifted from leaf litter near a stream in mixed deciduous forests at an altitude of 2039 m. Etymology. The specific epithet ‘ obesa ’ mean ‘obese’, referring to the morphology of the body in the male of the new species.Published as part of Cheng, Zhi-Fei, Li, Li-Zhen & Peng, Zhong, 2019, New species and new records of Lesteva Latreille, 1797 (Coleoptera Staphylinidae: Omaliinae) from China, pp. 1-39 in Zootaxa 4560 (1) on pages 19-20, DOI: 10.11646/zootaxa.4560.1.1, http://zenodo.org/record/262725
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