39,302 research outputs found
Gu Xiong : The River
No full textGu Xiong’s installation “The River” is described by O’Brian as a meditation on migrancy and displacement. The author situates the work within the life of the artist, who left China because of political oppression, and the history of the Canadian West, which has marginalized its Chinese inhabitants. Short poetic texts by Gu Xiong in which he identifies with spawning salmon are included. Biographical notes. 19 bibl. ref
Pestalotiopsis abietis C. M. Tian & M. Gu 2021, sp. nov.
No full text<i>Pestalotiopsis abietis</i> C.M. Tian & M. Gu, <i>sp. nov.</i> Figure 2 <p> <b>MycoBank no:</b> MB 832473.</p> <p> <i>Etymology</i>:— <i>abietis</i>, named after the host <i>Abies fargesii</i></p> <p> <b>Asexual morph</b>: <i>Conidiomata</i> pycnidial in culture on PDA, globose, scattered or gregarious and confluent, semi-immersed, dark brown, 100–650 μm diam. <i>Conidiophores</i> often reduced to conidiogenous cells. <i>Conidiogenous cells</i> discrete ampulliform to lageniform, smooth, thin-walled, hyaline, with 1–2 proliferations, sometimes remain vegetative. <i>Conidia</i> 19.9–31.2 × 5.8–8.0 μm (<i>x</i> = 24.0 × 6.8 μm), fusiform, straight to slightly curved, 4–septate, basal cell conic to obconic, hyaline or slightly olivaceous, thin and verruculose, 2.4–8 μm long (<i>x</i> = 4.7 μm), with three median cells, doliform, concolourous, olivaceous, septa and periclinal walls darker than the rest of the cell, together 11.4–17.6 μm long (<i>x</i> = 14.8 μm) second cell from base 3.5–6.4 μm (<i>x</i> = 5 μm); third cell 3.8–6.1 μm (<i>x</i> = 4.9 μm); fourth cell 4– 5.8 μm (<i>x</i> = 4.9 μm); apical cell hyaline, conic, 2.4–6 μm long (<i>x</i> = 4.3 μm); with 1–3 tubular apical appendages (mainly 3), arising from the apex of the apical cell, 7.6–20.6 μm long (<i>x</i> = 14.1 μm); basal appendage 1.3–5.2 μm long.</p> <p>......continued on the next page</p> <p>......continued on the next page</p> <p>......continued on the next page</p> <p>The ex-type strains are marked with *, and NA means not available.</p> <p> <i>Culture characteristics:</i> —Colonies on PDA attaining 25–45 mm diam after 7 d at 25 °C, with smooth edge, whitish, with sparse aerial mycelium on the surface with black, gregarious conidiomata; reverse similar in color.</p> <p> <i>Materials examined:</i> — CHINA, Shaanxi Prov., Ningshan County, Qinling Mountain, Huoditang forest park, 33°26’7”N 108°26’48”E, 1570 m a.s.l., on needles of <i>Abies fargesii</i>, N. Jiang & C.M. Tian, 3 July 2018 (Holotype BJFC-S1584, ex-type CFCC 53011; <i>ibid.</i> living culture CFCC 53012 and CFCC 53013).</p> <p> <i>Notes:</i> —This new species is introduced as molecular data showed it to be distinct, which is also supported by morphological traits. In the phylogram, <i>P. abietis</i> appears most closely related to <i>P. parva</i>. However, <i>P. parva</i> has shorter conidia compared with <i>P. abietis</i> (16.5–20 μm in <i>P. parva</i> vs. 19.9–31.2 μm in <i>P. abietis</i>) (Maharachchikumbura <i>et al.</i> 2014b). Therefore, we confirmed that <i>P. abietis</i> could be described as a new taxon.</p>Published as part of <i>Gu, Mo, Hu, Dong-Wei, Han, Bing, Jiang, Ning & Tian, Cheng-Ming, 2021, Pestalotiopsis abietis sp. nov. from Abies fargesii in China, pp. 93-105 in Phytotaxa 509 (1)</i> on pages 96-101, DOI: 10.11646/phytotaxa.509.1.4, <a href="http://zenodo.org/record/5426012">http://zenodo.org/record/5426012</a>
Constructing a Distance Sensitivity Oracle in O(n^2.5794 M) Time
No full textWe continue the study of distance sensitivity oracles (DSOs). Given a directed graph G with n vertices and edge weights in {1, 2, … , M}, we want to build a data structure such that given any source vertex u, any target vertex v, and any failure f (which is either a vertex or an edge), it outputs the length of the shortest path from u to v not going through f. Our main result is a DSO with preprocessing time O(n^2.5794 M) and constant query time. Previously, the best preprocessing time of DSOs for directed graphs is O(n^2.7233 M), and even in the easier case of undirected graphs, the best preprocessing time is O(n^2.6865 M) [Ren, ESA 2020]. One drawback of our DSOs, though, is that it only supports distance queries but not path queries.
Our main technical ingredient is an algorithm that computes the inverse of a degree-d polynomial matrix (i.e. a matrix whose entries are degree-d univariate polynomials) modulo x^r. The algorithm is adapted from [Zhou, Labahn and Storjohann, Journal of Complexity, 2015], and we replace some of its intermediate steps with faster rectangular matrix multiplication algorithms.
We also show how to compute unique shortest paths in a directed graph with edge weights in {1, 2, … , M}, in O(n^2.5286 M) time. This algorithm is crucial in the preprocessing algorithm of our DSO. Our solution improves the O(n^2.6865 M) time bound in [Ren, ESA 2020], and matches the current best time bound for computing all-pairs shortest paths
Episcaphium dabashanum Sheng & Gu, sp. nov.
No full textEpiscaphium dabashanum Sheng & Gu, sp. nov. (Figs. 8–14) Type material. Holotype: CHINA: Chongqing City: m#, 31 º 51 ’ 227 ”N, 109 º07’ 174 ”E, lower Huang’an-Gou, East Daba-shan, Chengkou County, alt. 2039 m, 22–23.IV. 2008, HUANG Hao & XU Wang leg. Description. BL: 4.6 mm. PW: 1.8 mm. Body including abdomen and legs black, antennal segments 1 to 6 and palpi dark reddish brown, antennal club black. Frons at narrowest point 0.45 mm wide, punctation coarse and dense on median portion, becoming fine and sparse towards eyes, near neck puncture diameters larger than puncture intervals. Punctation fine and sparse on tempora, finer and sparser on median portion of neck, without punctures laterally. Neck transversely microsculptured, except on smooth centre. Pronotum with lateral margin oblique, antebasal puncture row interrupted at middle, impressed laterally. Discal punctures very fine and sparse. Elytra impressed in apical fifth, without lateral impression, with four discal puncture rows consisting of very fine punctures. First and second rows starting at about basal ninth, third and fourth rows joined to basal row. First row short, ending slightly after mid-length of elytron, second and third somewhat close to each other, ending at about same level as fourth row, slightly behind apical third of elytron. Mesoventral process (Fig. 10) with raised, ridge-like edges, grooved in middle. Metaventrite (Fig. 11) extremely finely punctate, lacking microsculpture, with medio-apical impression distinct but shallow and narrowed anteriorly, with two small oval impressions near metacoxae. Sternite 3 finely and sparsely punctate, with transverse microsculpture in wide median portion, obsolete laterally. The following sternites finely and sparsely punctate, with microsculpture consisting of transverse striae. Abdominal tergites very finely and sparsely punctured, with microsculpture consisting of transverse striae on apical half. Male sexual character. Segments 1 to 3 of protarsi slightly widened. Aedeagus (Figs. 12, 13) 1.31 mm long. Median lobe with apical portion inflexed in lateral view. Basal process relatively large and prominent. Parameres slightly sinuate in lateral view. Internal sac (Fig. 7) with a pair of apical sclerotized rods and a pair of vertical laminae. Apical (when retracted) portion of internal sac covered by fine spine-like structures oriented proximally. Distribution. China (Chongqing). Remarks. This new species is very similar to E. catenatum Löbl, 1999, but it may be distinguished by the characters listed in the key. Etymology. This species name is derived from “Dabashan”, its type locality.Published as part of Sheng, Chun & Gu, Fu-Kang, 2009, Two new species of the genus Episcaphium Lewis (Coleoptera, Staphylinidae, Scaphidiinae) of China, pp. 35-38 in Zootaxa 2325 on pages 37-38, DOI: 10.5281/zenodo.27542
Deng Erya jiu cang jia gu.
No full text李宗焜拓摹并題."鄧爾雅(一八八四-一九五四)舊藏甲骨. 一九六九年五月鄧祖玄奉母葉多福女士之命以其父爾雅先生所藏甲骨慨贈香港中文大學聯合書院. 二〇一五年夏移藏大學圖書館""乙未仲冬余應香港中文大學圖書館李露絲館長之邀為館藏甲骨之儲存與展示貢愚余以坐言不如起行遂為之董理重為類次並施拓摹携歸裱冊而還之且識數語以記因緣李宗焜於史語所""Deng Erya (yi ba ba si - yi jiu wu si) jiu cang jia gu. Yi jiu liu jiu nian wu yue Deng Zuxuan feng mu Ye Duofu nü shi zhi ming yi qi fu Erya xian sheng suo cang jia gu kai zeng Xianggang Zhong wen da xue Lian he shu yuan. Er ling yi wu nian xia yi cang Da xue tu shu guan""Yi wei zhong dong yu ying Xianggang Zhong wen da xue tu shu guan Li Lusi guan zhang zhi yue wei guan cang jia gu zhi chu cun yu zhan shi gong yu yu yi zuo yan bu ru qi xing sui wei zhi dong li chong wei lei ci bing shi tuo mo xie gui biao ce er huan zhi qie shi shu yu yi ji yin yuan Li Zongkun yu Shi yu suo"In accordion binding.Li Zongkun tuo mo bing ti
Algan A., Mazerol M.T., Henry M. et Selosse J. — Vols et voleurs de véhicules à moteur. Un aspect particulier de la délinquance juvénile
No full textGu. A. Algan A., Mazerol M.T., Henry M. et Selosse J. — Vols et voleurs de véhicules à moteur. Un aspect particulier de la délinquance juvénile. In: Population, 21ᵉ année, n°5, 1966. pp. 1047-1048
Recommended from our members
The Global Sporting Power Elite: Eileen Gu
No full textThis chapter examines the geopolitical environment elite athletes, such as 2022 Beijing Winter Olympic Games double-gold-medallist Eileen Gu, are experiencing. Gu is exemplary of a modern, successful young athlete caught in the conflict between two superpowers as she navigates her dual identity in the eyes of the public. The chapter analyses the complexities of the geopolitical maelstrom in sport, documents Gu’s dual Chinese and American cultural identities, and extrapolates the hallmarks of a contemporary global citizen of sport through Gu. The chapter concludes by debating the risks and benefits to each country of the international movement of elite athletes, including economic development, cultural and political contexts, and international competitiveness
Krenn-Gu Conjecture for Sparse Graphs
No full textGreenberger–Horne–Zeilinger (GHZ) states are quantum states involving at least three entangled particles. They are of fundamental interest in quantum information theory, and the construction of such states of high dimension has various applications in quantum communication and cryptography. Krenn, Gu and Zeilinger discovered a correspondence between a large class of quantum optical experiments which produce GHZ states and edge-weighted edge-coloured multi-graphs with some special properties called the GHZ graphs. On such GHZ graphs, a graph parameter called dimension can be defined, which is the same as the dimension of the GHZ state produced by the corresponding experiment. Krenn and Gu conjectured that the dimension of any GHZ graph with more than 4 vertices is at most 2. An affirmative resolution of the Krenn-Gu conjecture has implications for quantum resource theory. Moreover, this would save huge computational resources used for finding experiments which lead to higher dimensional GHZ states. On the other hand, the construction of a GHZ graph on a large number of vertices with a high dimension would lead to breakthrough results.
In this paper, we study the existence of GHZ graphs from the perspective of the Krenn-Gu conjecture and show that the conjecture is true for graphs of vertex connectivity at most 2 and for cubic graphs. We also show that the minimal counterexample to the conjecture should be 4-connected. Such information could be of great help in the search for GHZ graphs using existing tools like PyTheus. While the impact of the work is in quantum physics, the techniques in this paper are purely combinatorial, and no background in quantum physics is required to understand them
Study of in-flight and impact dynamics of non-spherical particles from HVOF guns
No full textHigh velocity oxygen fuel thermal spray has been widely used to deposit hard composite materials such as WC-Co powders for wear-resistant applications. Unlike gas atomized spherical powders, WC-CO powders form a more complex geometry. The knowledge gained from the existing spherical powders on process control and optimization may not be directly applicable to WC-Co coatings. This paper is the first to directly examine nonspherical particle in-flight dynamics and the impingement process on substrate using computational methods. Two sets of computational models are developed. First, the in-flight particles are simulated in the CFD-based combusting gas flow. The particle information prior to impact is extracted from the CFD results and implemented in a FEA model to dynamically track the impingement of particles on substrate. The morphology of particles is examined extensively including both spherical and nonspherical powders to establish the critical particle impact parameters needed for adequate bonding. <br/
Schoengastiella (Schoengastiella) paraconfuciana Wang and Gu 1983
No full textSchoengastiella (Schoengastiella) paraconfuciana Wang and Gu, 1983: PALPublished as part of Nielsen, David H., Robbins, Richard G. & Rueda, Leopoldo M., 2021, Annotated world checklist of the Trombiculidae and Leeuwenhoekiidae (1758 - 2021) (Acari: Trombiculoidea), with notes on nomenclature, taxonomy, and distribution, pp. 1-243 in Zootaxa 4967 (1) on page 33, DOI: 10.11646/zootaxa.4967.1.1, http://zenodo.org/record/474551
- …
