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Cobitis striata subsp. hakataensis Nakajima 2012, subsp. nov.
No full text<i>Cobitis striata hakataensis</i> Nakajima, subsp. nov. <p>(Figs. 3C, 4E, F, 5C, 6C)</p> <p> Hakata form of <i>Cobitis striata</i> (middle race): Nakajima <i>et al.</i> 2008: 13, fig. 2G; Hakata form of middle race of <i>Cobitis striata</i> complex: Kitagawa <i>et al.</i> 2009: 12, fig. 2E, F; <i>Cobitis</i> sp. 3 subsp. 3: Nakajima <i>et al.</i> 2012: 92, fig. 3c.</p> <p> <b>Holotype.</b> TKPM-P17342, male, 58.0 mm SL, Japan: Tatara River, Kasuya, Fukuoka Pref., Kyushu, 12. XII. 2010, J. Nakajima.</p> <p> <b>Paratypes.</b> JNC005, 1 male, 54.4 mm SL, same data as holotype; JNC041, 1 male, 60.4 mm SL, Tatara R., Kasuya, Fukuoka Pref., Kyushu, 23. V. 2005, J. Nakajima; KPM-NI29504, male, 55.0 mm SL, Tatara R., Kasuya, Fukuoka Pref., Kyushu, 18. V. 2008, J. Nakajima; MPM-FI1502, 1 male, 48.8 mm SL, same data; FKUN33756, 1 female, 87.4 mm SL, Naka R., Minami-ku, Fukuoka, Fukuoka Pref., Kyushu, 20. IV. 2005, J. Nakajima; JNC006, 1 male, 59.1 mm SL, Muromi R., Nishi-ku, Fukuoka, Fukuoka Pref., Kyushu, 13. V. 2010. E. Miyamura.</p> <p> <b>Non-type specimens.</b> 1 male and 2 females, 56.4–63.4 mm SL, same data as holotype; 1 male and 2 females, 64.0– 69.7 mm SL, Muromi R., Nishi-ku, Fukuoka, Fukuoka Pref., Kyushu, 5. VI. 2006, J. Nakajima; 2 males, 65.0, 65.7 mm SL, Tatara R., Kasuya, Fukuoka Pref., Kyushu, 23. V. 2005, J. Nakajima; 1 male and 1 female, 52.6, 55.5 mm SL, Tatara R., Kasuya, Fukuoka Pref., Kyushu, 18. V. 2008, J. Nakajima.</p> <p> <b>Diagnosis.</b> This subspecies is distinguishable from other Japanese striated spined loaches by the following characteristics: body size moderate, the mature size about 50–60 mm SL in males, 55–80 mm SL in females; lamina circularis at the base of the pectoral fin of adult male simple roundish plate, the upper segments of the first branched soft ray narrow and weak (Fig. 6C); PMN commonly 13; line L3 formed by incomplete longitudinal line, reaching to caudal base; line L4 formed by longitudinal jagged weblike line, reaching to postanal body, broader than L 3 in male of non-spawning season; line L5 organized in 11–14 roundish or ovoid blotches in non-spawning season; caudal fin and dorsal fin with 3–4 arcuate bars; upper spot at the caudal base jet-black comparable in size to eye diameter; lower spot at caudal base faint or missing; egg yolk diameter approximately 1.0mm; karyotype diploid.</p> <p> <b>Description.</b> Lateral view in Figure 3C illustrate body shape, form and position of fins. Morphometric and meristic data for 11 males and 5 females are summarized in Table 2. Dorsal-fin rays iii, 7; anal-fin rays iii, 5; pectoral-fin rays i, 7–8; pelvic-fin rays ii, 6; caudal-fin rays 8+8. Body elongate, laterally compressed. Head and snout elongated. Interorbital space narrow, convex. Caudal peduncle relatively compressed. Mouth small, inferior, arched with fleshy lips; lower lip divided with two well-developed lobes; upper lip with transverse wrinkles on surface. Barbels, 3 pairs, first on rostora, second on maxillae, third on maxillomandibula; each barbel well developed, length of maxillary barbel same as eye diameter; length of rostral and mandibular barbels shorter than that of maxillary barbel. Lateral line short, reaching the central region between the pectoral-fin base and the tip of the fin. PMN commonly 13 (range, 13–14). Very small cycloid scales on the trunk. Lamina circularis at the base of the pectoral fin of adult male simple roundish plate (Fig. 6C). The first branched soft ray of pectoral fin longer than the others; pectoral fin of the male relatively longer than that of the female. The upper segments of the first branched soft ray of pectoral fin narrow and weak. Dorsal-fin base equidistant from the base of the caudal fin and the tip of the snout. Pelvic-fin origin below first or second branched dorsal-fin ray. Anal fin not reaching caudal-fin base. Margin of anal and dorsal fins slightly roundish. Caudal fin slightly roundish. Largest recorded specimens: 65.7 mm SL male, 69.7 mm SL female.</p> <p> <b>Coloration.</b> <i>Male in the non-spawning season</i> (Figs. 3C, 4E). Body yellowish white with dark brown pigmentation in fresh specimens. Clear streak running from the tip of snout to the occiput, crossing to the eye. Upper part of head, opercle and snout covered with oval or amorphous shape spots. Body pigmentation organized in one middorsal and four lateral zones. Line L1 consisting of a series of 14–16, saddles or oval-shaped blotches, irregularly chained to each other. Line L2 formed by longitudinal jagged line, reaching to middorsal region, often fused with L1. Line L3 formed by incomplete longitudinal line, reaching to caudal base. Line L4 formed by longitudinal jagged weblike line, reaching to postanal body, broader than L3. Line L5 organized in 11–14 blotches from upper part of the pectoral fin to the caudal-fin base; blotches roundish or ovoid. Caudal fin and dorsal fin with 3–4 arcuate bars. Anal fin pigmented along the fin rays. Upper spot at the caudal base jet-black comparable in size to eye diameter, lower spot at the caudal base faint or missing.</p> <p> <i>Male in the spawning season</i> (Fig. 4F). Line L4 not visible or formed by faint longitudinal line, present only in anterior half of body. Lines L3 and L5 well developed with broad stripes from the upper part of the pectoral-fin base to the caudal-fin base.</p> <p> <i>Female</i> (Fig. 5C). Appearance similar to males in the non-spawning season, but number of blotches of line L5 tends to be more than in the male, line L5 of female organized in 11–17 blotches.</p> <p> <b>Sexual dimorphism.</b> Males have roundish lamina circularis at the base of the pectoral fin, but females do not. Generally, the body size of females is larger than that of males.</p> <p> <b>Egg diameter.</b> 0.98 ± 0.05 mm (females, N = 3; collected from the Tatara River system, Fukuoka Prefecture).</p> <p> <b>Karyotype.</b> Diploid (Kitagawa <i>et al.</i> 2009).</p> <p> <b>Distribution.</b> Rivers flowing into Hakata Bay, northern Kyushu: Fukuoka Prefecture (Nakajima <i>et al.</i> 2008).</p> <p> <b>Habitat and biology.</b> This species inhabits sandy-mud bottoms of the middle and lower reach of rivers. Life histories are unknown.</p> <p> <b>Etymology.</b> The subspecific name is derived from the popular common name of the Fukuoka City area in which the type locality is situated.</p> <p> <b>Remarks.</b> The genetic features have been reported by Kitagawa <i>et al.</i> (2009).</p> <p> <b>Japanese name.</b> Hakata-suji-shima-dojyô.</p>Published as part of <i>Nakajima, Jun, 2012, Taxonomic study of the Cobitis striata complex (Cypriniformes, Cobitidae) in Japan, pp. 103-130 in Zootaxa 3586</i> on pages 115-11
Certain Cases of Hikita-Nakajima conjecture
No full textLet be an affine Nakajima quiver variety, and is the corresponding BFN Coulomb branch. Assume that can be resolved by the (smooth) Nakajima quiver variety . The Hikita-Nakajima conjecture claims that there should be an isomorphism of (graded) algebras , where is a torus acting on preserving the Poisson structure, is the (Poisson) deformation of over \mathfrak{s}=\on{Lie}S, is a generic one-dimensional torus acting on , and is the algebra of schematic -fixed points of . In this thesis we prove the Hikita-Nakajima conjecture for \mathfrak{M}= \widetilde{\C^2/ \Gamma} (Kleinian singularities) and Gieseker variety ( space). In the latter case we produce the isomorphism explicitly on generators. We also describe the Hikita-Nakajima isomorphism above using the realization of as
the spectrum of the center of the rational Cherednik algebra corresponding to and identify all the algebras that appear in the isomorphism with the center of the degenerate cyclotomic Hecke algebra.Ph.D
Hikita-nakajima conjecture for the Gieseker variety
No full textLet M0 be an affine Nakajima quiver variety, and let M be the corresponding BFN Coulomb branch. Assume that M0 can be resolved by the (smooth) Nakajima quiver variety M. The Hikita-Nakajima conjecture claims that there should be an isomorphism of (graded) algebras H∗
S (M, C) C[MC× s ], where S M0 is a torus acting on M0 preserving the Poisson structure, Ms is the (Poisson) deformation of M over s = Lie S, C× is a generic one-dimensional torus acting on M, and C[MC× s ] is the algebra of schematic C×-fixed points of Ms. We prove the Hikita-Nakajima conjecture forM = M(n,r) Gieseker variety (ADHM space). We produce the isomorphism explicitly on generators. We also describe the Hikita-Nakajima isomorphism above using the realization of Ms as the spectrum of the center of the rational Cherednik algebra corresponding to Sn (Z/rZ)n and identify all the algebras that appear in the isomorphism with the center of the degenerate cyclotomic Hecke algebra (generalizing
some results of Shan, Varagnolo, and Vasserot)
Complexity of Approximate Conflict-Free, Linearly-Ordered, and Nonmonochromatic Hypergraph Colourings
No full textUsing the algebraic approach to promise constraint satisfaction problems, we establish complexity classifications of three natural variants of hypergraph colourings: standard nonmonochromatic colourings, conflict-free colourings, and linearly-ordered colourings.
Firstly, we show that finding an -colouring of a k-colourable r-uniform hypergraph is NP-hard for all constant 2 ≤ k ≤ and r ≥ 3. This provides a shorter proof of a celebrated result by Dinur et al. [FOCS'02/Combinatorica'05].
Secondly, we show that finding an -conflict-free colouring of an r-uniform hypergraph that admits a k-conflict-free colouring is NP-hard for all constant 2 ≤ k ≤ and r ≥ 4, except for r = 4 and k = 2 (and any ); this case is solvable in polynomial time. The case of r = 3 is the standard nonmonochromatic colouring, and the case of r = 2 is the notoriously difficult open problem of approximate graph colouring.
Thirdly, we show that finding an -linearly-ordered colouring of an r-uniform hypergraph that admits a k-linearly-ordered colouring is NP-hard for all constant 3 ≤ k ≤ and r ≥ 4, thus improving on the results of Nakajima and Živný [ICALP'22/ACM TocT'23]
Medication equivalent dose program in R
No full textCitation: Shinsuke Koike, Yoji Hirano, Shinichiro Nakajima, Kentaro Morita, Medication equivalent dose program in R, Psychiatry and Clinical Neurosciences, 79(6), 356-357, 2025-03-31, https://doi.org/10.1111/pcn.1381
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
Measuring Firms’ R&D Effects on Technical Progress: Japan in the 199
No full textOne of the important public policy issues in science and technology is to ascertain if and how firms' investments in research and development (R&D) contribute to technical progress at firm and industry levels. Griliches (1979) made a pioneering contribution to our understanding of economic growth by pointing out that accumulation of firms' investments in R&D and creation of knowledge will lead to technical progress. In this paper we present a method based on index number theory for estimating technical progress and then apply it for estimating technical progress for Japanese manufacturing firms in the 1990s. Estimated technical progress is then used to test the above Griliches hypothesisR&D; Japan; technical progress; economic growth
"Closing the R&D Gap, Evaluating the Sources of R&D Spending"
No full textBoth spending and tax policies have been implemented in the United States with the goal of stimulating private sector research and development (R&D). Karier questions whether current R&D policy, especially the research and experimentation tax credit, can contribute to closing the gap between nondefense expenditures on R&D in the United States and such expenditures in other countries, such as Japan and Germany. He also explores possible changes to our current R&D policy to make it more effective.
Reply to the 'Comment on "Robust scalable high throughput production of monodisperse drops"' by M. Nakajima, Lab Chip, 2017, 17, DOI: 10.1039/C7LC00181A
No full textThis reply to the comment by Nakajima on our article that appeared in Lab on a Chip (E. Amstad, M. Chemama, M. Eggersdorfer, L. R. Arriaga, M. Brenner and D. A. Weitz, Lab Chip, 2016, 16, 4163-4172) highlights the differences between the microchannel step emulsification devices developed by the Nakajima group and the millipede device reported by us in Lab on a Chip.SMA
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
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