130,505 research outputs found
Hyphoderma marginatum Z. Y. Duan & C. L. Zhao 2023, sp. nov.
No full textHyphoderma marginatum Z.Y. Duan & C.L. Zhao, sp. nov. Figs. 3, 4 MycoBank no.: MB 847109 Etymology:— marginatum (Lat.) refers to the basidiomata with upwarping margin of the specimens. Holotype:— CHINA. Yunnan Province, Puer, Zhenyuan County, Xieqipo Forestry Park, E101°5′54″, N25°00′50″, elev. 1500 m, on fallen angiosperm branch, 1 October 2017, CLZhao 3404 (SWFC). Fruiting body:— annual, resupinate, adnate, membranous, without odor and taste when fresh, and up to 20 cm long, 2.5 cm wide, and 30–100 µm thick. Hymenial surface smooth, slightly cream when fresh, cream on drying, cracking, hard fragile. Margin sterile, narrow, upwarping, cream, up to 2 mm wide. Hyphal structure: — Monomitic, generative hyphae with clamp connections,colorless, thin-walled, frequently branched, interwoven, 2.5–4.5 µm in diam, IKI–, CB–, tissues unchanged in KOH. Hymenium: — Cheilocystidia cylindrical, slightly wider at the top, slightly constricted, thin-walled, 30–48.5 × 7.5–11.5 µm; basidia clavate to subcylindrical, slightly constricted in the base to somewhat sinuous, with 4 sterigmata and a basal clamp connection, 21–31.5 × 5–7 µm; basidioles in shape similar to basidia, but slightly smaller. Basidiospores: — (8.5–)9–10(–10.5) × 3.5–4.5(–5) µm, L = 9.68 µm, W = 3.99 µm, Q = 2.42 (n = 30/1), cylindrical, colorless, thin-walled, smooth, with irregular vacuole inside, IKI–, CB–.Published as part of Duan, Ziyan, Guan, Qianxin, Luo, Kaiyue & Zhao, Changlin, 2023, Morphological and molecular identification of three new resupinate species of Hyphoderma (Hyphodermataceae, Agaricomycetes) from East Asia, pp. 1-19 in Phytotaxa 599 (1) on page 7, DOI: 10.11646/phytotaxa.599.1.1, http://zenodo.org/record/798914
Leofa Prasutagus
No full textCHECKLIST OF Leofa (Prasutagus) species L. (P.) curtulus (Motschulsky, 1863). Sri Lanka, India. Deltocephalus oneratus Melichar, 1911. Sri Lanka. L. (P.) forcipatus Duan and Zhang sp. nov. China. L. (P.) palearctica Zahniser, 2008. Spain. L. (P.) pulchellus Distant, 1918. India, China. L. (P.) yangae Duan and Zhang sp. nov. China.Published as part of Duan, Yani & Zhang, Yalin, 2009, Review of the grassland leafhopper subgenus Leofa (Prasutagus) Distant (Hemiptera: Cicadellidae: Deltocephalinae: Chiasmini), pp. 35-43 in Zootaxa 1972 on page 36, DOI: 10.5281/zenodo.18505
Analysis of the conform process: a specific form of aluminium extrusion.
No full textSince the Conform process was patented 30 years ago, there have only been approximately 200 machines sold worldwide. Given that Conform competes economically with conventional extrusion and is also reported to be a more energy
efficient process, it is surprising that the use of Conform is not more widespread in today's increasingly environmentally conscious and high-production focussed world. One explanation for this is likely to be due to the fact that there is still limited knowledge of the thermo-mechanical behaviour of the workpiece during extrusion.
Furthermore, for the aluminium industry, there are still issues remaining regarding the production of flash and the quality of the extrudate in terms of mechanical properties. This study provides the reader with the findings of the research and experimental work undertaken by the author, his co-workers and fellow specialists, in the field of aluminium extrusion including Conform. The experimental work includes both laboratory experiments performed with a direct extrusion press and an experimental machine set up to replicate the Conform process. The experimental work is also simulated using finite element modelling techniques. The results from these analyses are then validated by comparing industrial and experimental data. The finite element analyses are enhanced by using parallel processing technology and user sub-routines. The author proposes new models to allow for the study of the different sub-processes in Conform. These include the coining of the feedstock, formation of the upset zone, extrusion of the flash, the filling-up of the expansion chamber / feeder plate and the extrusion of the extrudate. The author also investigates methods which predict microstructure and surface cracks in the extrudate. The author suggests innovative techniques to improve the efficiency of finite element analysis in metal forming. Finally the author recommends procedures for the study of structural integrity and the optimisation of the tooling used in Conform
Hyphoderma tropicum Z. Y. Duan & C. L. Zhao 2023, sp. nov.
No full text<i>Hyphoderma tropicum</i> Z.Y. Duan & C.L. Zhao, <i>sp. nov.</i> Figs. 5, 6 <p>MycoBank no.: MB 847192</p> Etymology:— <i>tropicum</i> (Lat.) refers to the locality (tropics) of the specimens. <p> <i>Holotype:—</i> CHINA. Yunnan Province, Wenshan, Wenshan National Nature Reserve, E 104°40′32″, N 23°19′32″, elev. 1258 m, on fallen angiosperm branch, 28 July 2019, CLZhao 17308 (SWFC).</p> <p> <b> <i>Fruiting body</i>:—</b> annual, resupinate, adnate, soft coriaceous when fresh, hard coriaceous upon drying, without odor and taste when fresh, and up to 20 cm long, 3 cm wide, and 100–200 µm thick. Hymenial surface tuberculate, white to cream when fresh, cream on drying, cracking. Margin sterile, narrow, and white to cream, up to 1–2 mm wide.</p> <p> <b> <i>Hyphal structure</i>: <i>—</i></b> Monomitic; generative hyphae with clamp connections,colorless, thin-walled, frequently branched, interwoven, 2.5–5 µm in diam, IKI–, CB–, tissues unchanged in KOH.</p> <p> <b> <i>Hymenium</i>: <i>—</i></b> Cystidia moniliform, thin-walled, 65–102.5 × 5.5–7.5 µm; basidia clavate, slightly constricted in the base to somewhat sinuous, with 4 sterigmata and a basal clamp connection, 29.5–38 × 4–6 µm; basidioles in shape similar to basidia, but slightly smaller.</p> <p> <b> <i>Basidiospores</i>: <i>—</i></b> 6.5–7.5(–8) × (2.5–)3–4 µm, L = 7.3 µm, W = 3.38 µm, Q = 2.16 (n = 30/1), ellipsoid to cylindrical, colorless, thin-walled, smooth, IKI–, CB–.</p>Published as part of <i>Duan, Ziyan, Guan, Qianxin, Luo, Kaiyue & Zhao, Changlin, 2023, Morphological and molecular identification of three new resupinate species of Hyphoderma (Hyphodermataceae, Agaricomycetes) from East Asia, pp. 1-19 in Phytotaxa 599 (1)</i> on pages 9-12, DOI: 10.11646/phytotaxa.599.1.1, <a href="http://zenodo.org/record/7989145">http://zenodo.org/record/7989145</a>
Figure 3 from: Duan L-D, Lin Y, Lu Z (2019) Ophiorrhiza shiqianensis (Rubiaceae), a new species from Guizhou, China. PhytoKeys 121: 43-51. https://doi.org/10.3897/phytokeys.121.30570
No full textFigure 3 Ophiorrhizahunanica. Neotype (designated by Duan et al. 2014), showing subterranean stem internodes 1–2 cm long and inflorescences 5- to many-flowered
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
PHYSICAL INTERPRETATION OF TORSION-ROTATIONAL PARAMETERS IN METHANOL AND ITS ISOTOPOMERS: COMPARISON OF GLOBAL FIT AND CENTRIFUGAL CALCULATION RESULTS
No full textY.B. Duan and K. Takagi, Phys, Lett. A 207, 203(1995). Y.B. Duan, L. Wang, X. T. Wu, I. Mukhopadhyay, and K. Takagi, J. Chem. Phys. 111, 2385-2391(1999). Y. B. Duan, L. Wang, I. Mukhopadhyay, and K. Takagi. J. Chem. Phys. 110, 927-935(1999). Y. B. Duan, L. Wang, and K. Takagi, J. Mol. Spectrosc. 193, 418-433(1999). Y. B. Duan, A. B. McCoy, J. Mol Spectrosc., 199 302-306(2000). Y. B. Duan, A. B. McCoy, L. Wang, and K. Takagi, J. Chem. Phys. 112, 212-219(2000). Y. B. Duan, A. B. McCoy, L. Wang, and K. Takagi, J. Chem, Phys., (2000), submitted.Author Institution: Department of Chemistry, The Ohio State UniversityThe molecular parameters for and methanol and its isotopomers , and with O-16, 17 and 18 will be presented. Two methods have been used to determine the parameters. One uses the recent formulation of the centrifugal distortion effects in terms of the potential parameters for a molecule that contains a three-fold symmetric internal . The other uses through a global fit to observed high resolution microwave, millimeter wave and Fourier transform far-infrared spectra based on a reduced torsion-rotational Hamiltonian . The calculated parameters, in particular the constants that represent interactions between torsion and rotation, are used to interpret the relationships among the terms in the reduced Hamiltonian. By calculating the molecular parameters from several potential energy functions for methanol isotopomers we can check the quality of these potentials. Finally, the calculated parameters are compared with the parameters that were obtained from global fits. The good agreements between the calculated centrifugal distortion terms and those derived from the fits to the spectra demonstrates that the derived formulae provide a useful tool for understanding the physical origins and mass dependence of fundamental molecular
Figure 1 from: Yin D-H, Huang T-F, Lu Z, Duan L-D (2021) A new species and a new series of Elatostema (Urticaceae) from south-western China. PhytoKeys 180: 65-71. https://doi.org/10.3897/phytokeys.180.65813
No full textFigure 1 Elatostema xingyiense L.D. Duan & D.H.Yin A habit B male flower C male inflorescence in fresh specimen D male inflorescence E male inflorescence and secondary peduncle F female inflorescence in fresh specimen G female inflorescence H blades in fresh specimen I bract longitudinally 3-ribbed. Photos: Lin-Dong Duan and Dan–Hong Yin
Square Dancing with the Stars to Enhance Dynamic Hirschman Linkages?
No full textIn this Presidential Address, the author takes the reader on a reconnaissance of his life and time as a regional scientist. He points out scenery he found scintillating along the way, hoping that some may pick up the banner and chew on a few of the ideas for a while. He suggests a revisit to Albert O. Hirschman’s notion of key sectors and more empirical analysis related to Marcus Berliant’s and Masahisa Fujita’s notion of knowledge creation and transfer.Presidential Address, San Antonio, Texas, March 29, 2014 (53rd Meetings of the Southern Regional Science Association
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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