91,091 research outputs found
Journal for Geometry and Graphics
No full textThe singular coincidence in 2022, 25th anniversary of the publication of the first issue of the Journal of Geometry and Graphics (JGG), 30th anniversary of the establishment of the International Society for Geometry and Graphics (ISGG), and 80th birthday of Hellmuth Stachel, Professor of Geometry at the Technical University of Vienna (now retired), founder and former Editor in Chief of the JGG, and co-founder of ISGG, suggested the idea of this special issue.
The Editorial Board, formed by the current Editor in Chief who launched the proposal, the President, the Vice-Presidents, and the Treasurer of ISGG, decided to publish the issue as part of the JGG series, in order to reach the audience of readers familiar with the journal, and with the person to whom this issue is dedicated.
The volume includes two editorial sections, “Personal Memories” and “Scientific Contri butions”, in the aim of reflecting the wide spectrum of competences and interests of Hellmuth Stachel, deepened and shared in a life actively spent between research and education, without missing some personal items and anecdotes.
“Personal Memories” consist of short contributions written by people being, or having been, closely connected with Hellmuth Stachel over more than three decades, who share their personal records about his role in science, education, and community services.
“Scientific Contributions” refer to the world wide scientific impact of Hellmuth Stachel, and consist of a number of papers on topics related to Geometry and Graphics, written by authors of various backgrounds and generations, invited from the three ISGG world regions (Asia/Australia/Oceania, Europe/Near East/Africa, North America/South America).
May this special issue celebrating such an exemplary academic profile, inspire all the readers, as well as the whole JGG and ISGG communities, and, why not, initiate a new editorial line inside the JGG series.
On behalf of JGG and ISGG, we warmly address to Professor Hellmuth Stachel our birthday wishes, and cordial greetings to his family and his wife Mrs. Henrike.
The Guest Editorial Board of JGG 26/1
Liang-Yee Cheng, Luigi Cocchiarella, Hans-Peter Schr ̈ocker, Kumiko Shiin
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
The L-p-to-L-q boundedness of commutators with applications to the Jacobian operator
No full textSupplying the missing necessary conditions, we complete the characterisation of the L-p -> L-q boundedness of commutators [b, T] of pointwise multiplication and Calderon-Zygmund operators, for arbitrary pairs of 1 q, our results are new even for special classical operators with smooth kernels. As an application, we show that every f is an element of L-p(R-d) can be represented as a convergent series of normalised Jacobians J(u) = det del uof u is an element of (over dot(W))(1,dp)(R-d)(d). This extends, from p = 1 to p > 1, a result of Coifman, Lions, Meyer and Semmes about J:. (over dot(W))(1,d)(R-d)(d) -> H-1(R-d), and supports a conjecture of Iwaniec about the solvability of the equation Ju = f is an element of L-p(R-d). (C) 2021 The Author(s). Published by Elsevier Masson SAS.Peer reviewe
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.
ISGG: Cooperative Mission in the AI Era
No full textAt the 21st International Conference on Geometry and Graphics (ICGG2024, August, 2024), an international panel was organized with the In- stitutional Members and Associated National Organizations of ISGG to discuss cooperative mission in the AI era and its relation to the International Society for Geometry and Graphics. This is a summary of the discussion with the panel members Luigi Cocchiarella (Italy), Liang-Yee Cheng (Brazil), Michal Zamboj (Czech Republic), Hans-Peter Schro ̈cker (Austria), Hongming Cai (China), Eva Wohlleben (Germany), Stefano Bertocci (Italy), and Hirotaka Suzuki (Japan)
Rapid degradation of p-arsanilic acid with simultaneous arsenic removal from aqueous solution using Fenton process
No full textAlthough banned in some developed countries, p-arsanilic acid (p-ASA) is still used widely as a feed additive for swine production in many countries. With little uptake and transformation in animal bodies, nearly all the p-ASA administered to animals is excreted chemically unchanged in animal wastes, which can subsequently release the more toxic inorganic arsenic species upon degradation in the environment. For safe disposal of the animal wastes laden with p-ASA, we proposed a method of leaching the highly water-soluble p-ASA out of the manure first, followed by treatment of the leachate using the Fenton process to achieve fast oxidation of p-ASA and removal of the inorganic arsenic species released (predominantly arsenate) from solution simultaneously. The effects of solution pH, dosages of H2O2 and Fe2+, and the presence of dissolved organic matter (DOM) on the treatment efficiency were systematically investigated. Under the optimum treatment conditions (0.53 mmol L-1 Fe2+, 2.12 mmol L-1 H2O2, and initial pH of 3.0), p-ASA (10 mg-As L-1) could be completely oxidized to As(V) within 30 min in pure water and 4 natural water samples, and at the final pH of 4.0, the residual arsenic levels in solution phase were as low as 1.1 and 20.1-43.4 mu g L-1 in the two types of water matrixes, respectively. The presence of humic acid significantly retarded the oxidation of p-ASA by scavenging HO center dot, and inhibited the As(V) removal through competitive adsorption on ferric hydroxide. Due to the high contents of DOM in the swine manure leachate samples (TOC at similar to 500 mg L-1), much higher dosages of Fez} (10.0 mmol L-1) and H202 (40.0 mmol L-1) and a longer treatment time (120 min) were required to achieve near complete oxidation of p-ASA (98.0%), while maintaining the levels of residual arsenic in the solution at <70.0 mu g L-1. The degradation pathway of p-ASA in the Fenton process was proposed based on the major degradation products detected. Together, the results demonstrate that the Fenton process is promising as an efficient, robust, and low-cost treatment method for controlling the risk of p-ASA in the animal wastes generated at factory farms. (C) 2015 Elsevier Ltd. All rights reserved.Natural Science Foundation of China [41322024, 41202251, 41472324]; National Program for Support of Top-notch Young ProfessionalsSCI(E)[email protected]
boundedness of Forelli-Rudin type operators on the unit ball of
No full textWe completely characterize boundedness of two classes of
Forelli-Rudin type operators on the unit ball of for all . The results are not only a complement to
some previous results on Forelli-Rudin type operators by Kures and Zhu in 2006
and the first author in 2015, but also a high dimension extension of some
results by Cheng, Fang, Wang and Yu in 2017.Comment: 20 pages; 1 figur
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>
Paraparatrechina brunnella LaPolla and Cheng, sp. nov.
No full textParaparatrechina brunnella LaPolla and Cheng, sp. nov. (Fig. 3, 16, 17) Holotype worker, CAMEROON: Nkoemvon; 1980; F 49 (D. Jackson) (BMNH); 8 paratype workers, same locality as holotype (BMNH, NMNH). Worker diagnosis: small size (TL 1.2–1.6); head, mesosoma, and gaster brown, contrasting with yellowishbrown antennae and mandibles; golden pubescence covering body (especially visible on head). Compare with: P. albipes WORKER. Measurements (n= 10): TL: 1.23–1.58; HW: 0.32–0.37; HL: 0.37–0.41; EL: 0.09–0.12; SL: 0.35–0.46; PW: 0.22–0.29; WL: 0.35–0.52; PDH: 0.19–0.25; PrFL: 0.29–0.37; PrFW: 0.1–0.12; GL: 0.45– 0.65. Indices: CI: 81–94; REL: 23–28; SI: 102–124; FI: 30–38 Head brown, with contrasting yellowish-brown antennae and mandibles; cuticular surface shining; head slightly longer than broad. Golden pubescence covers head. Scapes surpass posterior margin by about the length of the first funicular segment. Mesosoma brown and compact; fine golden pubescence covers entire dorsum of mesosoma. Pronotum rises steeply from anterior margin to dorsum. Propodeum low, with a very short, angular dorsal face followed by a long declivitous face; petiole yellowish-brown. Procoxae brown; meso/metacoxae whitish-yellow; trochanters white; femurs and tarsi yellowish-brown, becoming lighter towards last tarsal segments; gaster brown. Etymology. The species epithet is a Latin diminutive adjective meaning brown and small, in reference to the main color of the body and the generally small size of ants in this genus. Non-type material examined: CAMEROON: Nkoemvon, 1980 (D. Jackson); GABON: 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); GHANA: Tafo (B. Bolton); KENYA: Kakamega Forest, E 34 ° 52 ’ 16, N 00° 19.49 (H. Garcia). Notes. P. albipes could be confused with this species if the pro/mesonotal white patch is not distinct on P. albipes. P. brunnella possess more pubescence on the head and mesosoma than P. albipes, and has a shorter scape (brunnella range: 0.35–0.46 mm compared with albipes range: 0.48–0.53 mm).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 7-8, DOI: 10.5281/zenodo.19380
De Maiestate / Praeside M. Jacobo Thomasio, Moralis Philosoph. P. P., publice disputabit Johannes Dunte, R. L. Author & Respon: ad diem 9. Septembr. H L. Q. C.
No full textDE MAIESTATE / PRAESIDE M. JACOBO THOMASIO, MORALIS PHILOSOPH. P. P., PUBLICE DISPUTABIT JOHANNES DUNTE, R. L. AUTHOR & RESPON: AD DIEM 9. SEPTEMBR. H L. Q. C.
De Maiestate / Praeside M. Jacobo Thomasio, Moralis Philosoph. P. P., publice disputabit Johannes Dunte, R. L. Author & Respon: ad diem 9. Septembr. H L. Q. C. (1)
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