27,644 research outputs found
Supplementary Tables for Lei et al. (2023) submitted to Geophysical Research Letters
No full textThis file includes Supplementary Tables S1-S5 for: Lei, K., Wang, H., Wang, Y. L., Zhang, Q., & Li, X.-H. In Situ Zircon Si–O Isotopic Systematics of The Paleoarchean TTGs from Barberton and Their Tectonic Implications. Geophysical Research Letters, submitted in April 202
Risicoanalyse van Q-organismen in de glastuinbouw
No full textEen plantgezondheidsfonds of verzekering voor ondernemers kan ondernemers aansporen om het risico te verminderen op q-organismen, oftewel quarantaine(waardige) organismen. Het LEI maakte een model om de premies voor een dergelijk fonds te berekenen. Met behulp van een kwantitatieve analyse is een viertal Q-organismen, Tomatengeelkrulbladvirus, aardappelspindelknolviroïde (PSTVd), Thrips palmi en Clavibacter in kaart gebracht
q-Differential equations for q-classical polynomials and q-Jacobi-Stirling numbers
No full textWe introduce, characterise and provide a combinatorial interpretation for the so-called q-Jacobi–Stirling numbers.
This study is motivated by their key role in the (reciprocal) expansion of any power of a second order
q-differential operator having the q-classical polynomials as eigenfunctions in terms of other even order operators,
which we explicitly construct in this work. The results here obtained can be viewed as the q-version of
those given by Everitt et al. and by the first author, whilst the combinatorics of this new set of numbers is a
q-version of the Jacobi–Stirling numbers given by Gelineau and the second author
Hydnellum ailaoense L. Lei & Q. Zhao 2023, sp. nov.
No full textHydnellum ailaoense L. Lei & Q. Zhao, sp. nov. (Figs. 2, 3, 4) Index Fungorum number: IF900404; Facesoffungi number: FoF14128 Etymology:—The specificity “ ailaoense ” refers to the location where the type specimen was collected. Diagnosis:—Differs from other Hydnellum species by pileus uplifted squamosa, margin brownish beige to grey, the tuberculi of basidiospores usually isolated or grouped in 2 or more, and abundant-septate of the hyphae in context. Basidiocarp annual, solitary to gregarious, soft texture when fresh, and light in weight when dried. Pileus 4–7.5 cm diam, irregular circular, first broadly convex, becoming planar or center slightly depressed, margin incurved and occasionally incised with age, light brown (6D7) to brown (7E8), azonate, velutinate occasionally lobed with age, uplifted squamosa, tomentose at the early stage, becoming cuticle, crowded, gradually sparse and smooth toward the margin, dark brown (7F7) to black, margin of pileus grey (5C1) to brownish beige (6E3). Spines up to 1.5 mm long when dried, brown (7E8), 6–10 per mm, brown (7E5) at the base, white at the tip, gradually sparse towards the base of the stipe, and easy to fall off. Stipe 4–6.5 × 1–1.5cm, club-shaped, subeccentric to eccentric, light brown (6D5), brown (7E5), dark brown (7F8) to black, scabrous, denser spines on the surface, and gradually sparse to downward. Basidiospores 5.5–7 (–7.5) × 4.5–6 (–6.5) μm, L m = 6.3 μm, W m = 5.2 μm, Q = 1.09–1.33 (n = 60/2), Q m = 1.21 ± 0.08, subglobose, broadly elliptical to oval, brown, CB –, IKI –, irregular, with warty convexity, and tuberculi usually isolated or grouped in 2 or more, up to 1.0 µm. Basidia (32–) 35–51 (–56) × 5–9 µm, clavate, 4-spored, sterigmata 3–5 µm long, basal septa lacking clamps, cystidia and cystidioles absent. Mycelial structure: monotypic hyphal system, generative mycelium, with simple septa, and olive tissues in KOH, CB –, IKI –. Context: mostly 5–11 μm diam, usually thin-walled, hyaline, occasional branched, abundant-septate, and regularly to sub-regularly arranged. Spines: 2–5 μm diam, usually hyaline, thin-walled, frequently branched, more or less parallel along the spines, simple septate with straight. Habitat:—Solitary, growing on the ground dominated by Fagaceae and Pinaceae forests. Material examined:— CHINA, Yunnan Province, Nanhua county, Ailao Mountains, 24°54′0.122N, 100°47′24.599′′E, alt. 2498 m, 17 August 2021, Lei Lei, ALS16 (HKAS 125553, holotype); ibid., alt. 2337 m., 18 August 2021, Lei Lei, ALS236 (HKAS 125554). Notes: — Hydnellum ailaoense is characterized by its light brown to brown pileus, dark brown to black uplifted squamosa, margin brownish beige to grey, basidiospores subglobose, broadly elliptical to oval, the tuberculi usually isolated or grouped in 2 or more, and abundant-septate of the hyphae in context. Morphologically, H. ailaoense resembles H. underwoodii in azonate pileal surface, spiny stipe, similar-sized basidiospores, and olive tissues in KOH. However, H. ailaoense can be easily distinguished from H. underwoodii by its darker colour of basidiocarp, the relatively smooth margin of the pileus, finer hyphae of pileus (5–11 μm vs. up to 20 μm) and spines (2–5 μm vs. up to 9 μm). The scale size and arrangement of the former are irregular, while the scales of the latter are very small (1–2 mm) and subzonately arranged (Banker 1906, Baird et al. 2013). Phylogenetically, our new taxa Hydnellum ailaoense (HKAS 125553) forms a well-supported clade, and is grouped as a sister clade to H. underwoodii with 100% ML bootstrap support and 1.00 Bayesian probability in nLSU-ITS multi-gene phylogeny (Fig. 1).Published as part of Lei, Lei, Luangharn, Thatsanee, Yu, Feng-Ming, Li, Wei-Jiao, Li, Wen-Chun & Zhao, Qi, 2023, A novel hydnoid species of Hydnellum (Bankeraceae, Thelephorales) from southwest China, pp. 291-300 in Phytotaxa 600 (5) on pages 295-297, DOI: 10.11646/phytotaxa.600.5.4, http://zenodo.org/record/812941
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Network Q
No full textA press release from Network Q announcing that they will begin featuring Brian McNaught, a gay columnist and author, for a monthly segment
Network Q
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Tobin's Q and Financial Policy
No full textRecent research in macroeconomics has emphasized the importance of linking the financial and real sectors and the need for working with optimizing models. Tobin’s Q model of investment would appear to provide a framework that can satisfy these two criteria. In contrast to the original presentation of the Q model, the formal development has not recognized that the firm actively participates in a number of financial markets; in this broader context, we show that Q is likely to be an uninformative and possibly misleading signal for investment expenditures . We then endeavor to turn this negative theoretical result to positive advantage in resolving a number of empirical problems with Q models, but the modifications dictated by the theory receive little support from the data.
A Q-learning based multi-strategy integrated artificial bee colony algorithm with application in unmanned vehicle path planning
No full textArtificial bee colony (ABC) is a prominent algorithm that offers great exploration capabilities among various meta-heuristic algorithms. However, its monotonous and one-dimensional search strategy limits its searching performance in the solving process. Thus, to address this issue, a Q-learning based multi-strategy integrated ABC algorithm (QMABC) is proposed. In the QMABC, multiple search strategies are proposed to utilize different individual experiences and search approaches for solution updates. Then, Q-learning is employed for strategy selection. In comparison to previous studies, this paper introduces more effective state and action configurations within the framework of Q-learning. To evaluate the performance of the QMABC, CEC 2017 benchmark functions are adopted to compare it to different meta-heuristic algorithms including ABC based and non-ABC based algorithms. Moreover, applications in path planning are implemented to further verify the effectiveness of the QMABC. Overall, it should be highlighted that the proposed QMABC demonstrates superiority in both numerical and practical experiments.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Discrete Mathematics and Optimizatio
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