572,868 research outputs found
Litsea auriculata S. S. Chien & W. C. Cheng 1931
No full textLitsea auriculata S.S.Chien & W.C.Cheng (1931: 59). Type:— CHINA. Zhejiang [Chekiang]: Western Tian Mu Shan [W. Tien-mushan], elev. ca. 1100 m, 8 August 1929, S. S. Chien 601 (PE00028512, lectotype designated by Lin et al. 2016; isolectotypes A00041694, CQNM0015781, K000793089, NF2000700, NAS00070861, PE00028938, PE00434507). Remaining syntypes: CHINA. Zhejiang: Western Tian Mu Shan, elev. 800–1200 m, 17 April 1931, W. C. Cheng 2348 (A00041692, CQNM0015783, IBSC000227, K000793088, NF2000695, NY00355220, PE00028503, PE00028504, PE00028505, PE00028506) and W. C. Cheng 2349 (A00041693, CQNM0015784, IBSC0000229, K000793087, LBG00072037, NAS00070859, NAS00070860, NF2000694, NY00355221, PE00028508, PE00028509, PE00028510, PE00028511). Note:— In the protologue, Chien & Cheng (1931) designated S.S. Chien 601 (fruiting), W.C. Cheng 2348 (pistillate) and W.C. Cheng 2349 (staminate) deposited at the herbarium of Biological Laboratory of the Science Society of China as the type, and all of them are syntypes according to Art.9.6 (Turland et al. 2018). Lin et al. (2016) designated PE00028512 as the lectotype. The available isolectotypes and remaining syntypes are traced at the above listed herbaria.Published as part of Chen, Feng & He, Hai, 2022, The historical relics in Chongqing Natural History Museum: An annotated checklist of original materials for 37 names of Chinese seed plants, pp. 38-52 in Phytotaxa 530 (1) on page 42, DOI: 10.11646/phytotaxa.530.1.3, http://zenodo.org/record/582393
3D Online Multimedia and Games
No full textOnline applications have been gaining wide acceptance among the general public. Companies like Amazon, Google, Yahoo! and NetFlicks have been doing extremely well over the last few years largely because of people becoming more comfortable and trusting of the Internet. The increasing acceptance of online products makes it increasingly important to address some of the scientific techniques involved in developing efficient 3D online systems.
The topics discussed in this book broadly cover four categories: networking issues in online multimedia; joint texture-mesh simplification and view independent transmission; view dependent transmission and server-side rendering; content and background creation; and creating simple online games.
Contents:
Adaptive Bandwidth Monitoring for QoS Based Retrievel (A Basu et al.)
Wireless Protocols (A Khan)
Overview of 3D Coding and Simplification (I Cheng & L Ying)
Scale-Space Filtering and LOD — The TexMesh Model (I Cheng)
Adaptive Online Transmission of Photo-Realistic Textured Mesh (I Cheng)
Perceptual Issues in a 3D TexMesh Model (I Cheng)
Quality Metric for Approximating Subjective Evaluation of 3D Objects (A Basu et al.)
Perceptually Optimized 3D Transmission Over Wireless Networks (I Cheng & A Basu)
Predictive Schemes for Remote Visualization of 3D Models (P Zanuttigh & G M Cortelazzo)
A Rate Distortion Theoretic Approach to Remote Visualization of 3D Models (N Brusco et al.)
3D Content Creation by Passive Optical Methods (L Ballan et al.)
3D Visualization and Compression of Photorealistic Panoramic Backgrounds (P Zanuttigh et al.)
A 3D Game — Castles (G Xiao et al.)
A Networked Version of Castles (D Lien et al.)
A Networked Multiplayer Java3D Game — Siege (E Benner et al.)
Collaborative Online 3D Editing (I Cheng et al.
On Semialgebraic Range Reporting
Full text linkSemialgebraic range searching, arguably the most general version of range searching, is a fundamental problem in computational geometry. In the problem, we are to preprocess a set of points in ℝ^D such that the subset of points inside a semialgebraic region described by a constant number of polynomial inequalities of degree Δ can be found efficiently.
Relatively recently, several major advances were made on this problem. Using algebraic techniques, "near-linear space" data structures [Agarwal et al., 2013; Matoušek and Patáková, 2015] with almost optimal query time of Q(n) = O(n^{1-1/D+o(1)}) were obtained. For "fast query" data structures (i.e., when Q(n) = n^{o(1)}), it was conjectured that a similar improvement is possible, i.e., it is possible to achieve space S(n) = O(n^{D+o(1)}). The conjecture was refuted very recently by Afshani and Cheng [Afshani and Cheng, 2021]. In the plane, i.e., D = 2, they proved that S(n) = Ω(n^{Δ+1 - o(1)}/Q(n)^{(Δ+3)Δ/2}) which shows Ω(n^{Δ+1-o(1)}) space is needed for Q(n) = n^{o(1)}. While this refutes the conjecture, it still leaves a number of unresolved issues: the lower bound only works in 2D and for fast queries, and neither the exponent of n or Q(n) seem to be tight even for D = 2, as the best known upper bounds have S(n) = O(n^{m+o(1)}/Q(n)^{(m-1)D/(D-1)}) where m = binom(D+Δ,D)-1 = Ω(Δ^D) is the maximum number of parameters to define a monic degree-Δ D-variate polynomial, for any constant dimension D and degree Δ.
In this paper, we resolve two of the issues: we prove a lower bound in D-dimensions, for constant D, and show that when the query time is n^{o(1)}+O(k), the space usage is Ω(n^{m-o(1)}), which almost matches the Õ(n^{m}) upper bound and essentially closes the problem for the fast-query case, as far as the exponent of n is considered in the pointer machine model. When considering the exponent of Q(n), we show that the analysis in [Afshani and Cheng, 2021] is tight for D = 2, by presenting matching upper bounds for uniform random point sets. This shows either the existing upper bounds can be improved or to obtain better lower bounds a new fundamentally different input set needs to be constructed
Dr. Glendon Swarthout
No full textHosted by Roger M. Busfield, MSU Assistant Professor of Speech and Theater, Meet the Author is designed to introduce a general audience to a contemporary author and their work through in-depth interviews. This episode features a conversation between Dr. Glendon Swarthout, prolific author and English professor at MSU, and assistant professors Sam S. Baskett and Theodore B. Strandness
Data for The colloidal nature of complex fluids enhances bacterial motility
No full textThe archived data are the post-processed final data corresponding to figures in the manuscript as well as codes used for generating key plots.IPRIME at University at Minnesota. US National Science Foundation CBET-1702352 and 2028652Kamdar, Shashank; Shin, Seunghwan; Leishangthem, Premkumar; Francis, Lorraine F; Xu, XinLiang; Cheng, Xiang. (2022). Data for The colloidal nature of complex fluids enhances bacterial motility. Retrieved from the University Digital Conservancy, https://doi.org/10.13020/nfr5-te36
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
Replication Data for: Observation of returning Thouless pumping
No full textThis repository contains the data and code used for the analyses presented in the manuscript "Cheng, Z., Yue, S., Long, Y. et al. Observation of returning Thouless pumping. Nat Commun 16, 9669 (2025). https://doi.org/10.1038/s41467-025-64671-w"
It is also related to preprint arXiv:2505.0680
Paraparatrechina umbranatis LaPolla and Cheng, sp. nov.
No full textParaparatrechina umbranatis LaPolla and Cheng, sp. nov. (Fig. 9, 16, 17) Holotype worker, GABON: Prov. Ogooue-Martime; Res. Monts Doudou; 24.5 km 303 ° WNW Doussala; 2 °14.0’S, 10 ° 23.9 ’E; 18.iii. 2000; elev. 630 m (B.L. Fisher # 2276) (CASC); 8 paratype workers, same locality as holotype (CASC, USNM) Worker diagnosis: body distinctly bicolored, with gaster much darker than head and mesosoma. Compare with: P. oreias and P. subtilis WORKER. Measurements (n= 12): TL: 1.19–1.57; HW: 0.34–0.36; HL: 0.38–0.41; EL: 0.098–0.112; SL: 0.38–0.43; PW: 0.21–0.27; WL: 0.42–0.49; PDH: 0.18–0.23; PrFL: 0.31–0.34; PrFW: 0.098–0.112; GL: 0.39–0.7. Indices: CI: 87–92; REL: 25–29; SI: 108–120; FI: 30–36 Head yellowish-brown to light brown, with antennae mandibles, and medial area between antennae slightly lighter; head slightly longer than broad. A dense layer of fine, short, slightly decumbent pubescence covers head. Scapes surpass posterior margin by about the length of the first funicular segment; scape with a dense, slightly decumbent pubescence. Mesosoma yellowish-brown to light brown; fine pubescence covers entire mesosomal dorsum; lateral portions of the mesosoma are distinctly shinier than the dorsum. Pronotum rises steeply from anterior margin to dorsum. Propodeum possesses a short, angular dorsal face, with a long declivitous face. Legs generally lighter colored than mesosoma, becoming whitish towards last tarsal segments. Procoxae usually darker brown than meso/metacoxae; gaster conspicuously darker than head and mesosoma and is covered in a dense layer of pubescence. Etymology. The species epithet is a Latin noun in apposition, a compound of umbra (=shade) and natis (=rump), in reference to the fact that the gaster is much darker in color than the head and mesosoma. Non-type material examined: ANGOLA: Salazar, 9–15.iii. 1972 (P.M. Hammond); GABON: Prov. Ogooue-Maritime, Res. Monts Doudou, 25.2 km 304 ° NW Doussala, 10 ° 23.7 ’ E, 2 ° 13.6 ’ S, 14.iii. 2000, elev. 640 m (B.L. Fisher); Prov. Ogooue-Maritime, Res. Monts Doudou, 24.5 km 303 ° WNW Doussala, 10 ° 23.9 ’ E, 2 ° 14.0’ S, 18.iii. 2000, elev. 630 m (B.L. Fisher); Prov. Ogooue-Maritime, Reserve de la Moukalaba- Dougoua, 7km NW Doussala, 10 ° 32.65 ’ E, 2 19.84 ’ S, 21.iii. 2000, elev. 110 m (S. van Noort); KENYA: Buyangu Nature Reserve, 0.37 ° N, 34.87 ° E (R. Snelling & A. Espira). Notes. This species is easily recognizable by the distinctly darker gaster (brown) contrasting with the yellow-brown head and mesosoma. While many Paraparatrechina species display various coloration patterns between the different tagmata this is the only species that could be considered truly bicolored.Published as part of Lapolla, John S., Cheng, Chiu H. & Fisher, Brian L., 2010, Taxonomic revision of the ant (Hymenoptera: Formicidae) genus Paraparatrechina in the Afrotropical and Malagasy Regions, pp. 1-27 in Zootaxa 2387 on pages 15-16, DOI: 10.5281/zenodo.19380
Acer sinopurpurascens W. C. Cheng
No full textAcer sinopurpurascens W.C.Cheng in Chien & Cheng (1931: 62). Type:— CHINA. Zhejiang [Chekiang]: Western Tian Mu Shan [Tienmu-shan], elev. 1200–1300 m, 23 April 1931, W. C. Cheng 2424 (PE00023445, lectotype designated by Lin et al. 2009; isolectotypes A00245405, CQNM0015724, IBSC0002074, K000640863, NAS00071819, PE00023443, PE00023446, PE00023448). Remaining syntypes: CHINA. Zhejiang: Western Tianmushan, elev. ca. 845, 16 August 1929, S. S. Chien 845 (A00050488, CQNM0015723, NAS00071817, NAS00071818, NY00337718, PE00023444, K000640862); elev. 1200–1300 m, 23 April 1931, W. C. Cheng 2429 (A00245404, IBSC0002073, K000640864, LBG00076624, PE00023447). Note: —In the protologue, Chien & Cheng (1931) designated three gatherings as types of flowering, staminate and pistillate, respectively. Lin et al. (2009) chose a duplicate of staminate at PE (00023445) as the lectotype. The isolectotypes and remaining syntypes are listed above.Published as part of Chen, Feng & He, Hai, 2022, The historical relics in Chongqing Natural History Museum: An annotated checklist of original materials for 37 names of Chinese seed plants, pp. 38-52 in Phytotaxa 530 (1) on page 46, DOI: 10.11646/phytotaxa.530.1.3, http://zenodo.org/record/582393
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