166,531 research outputs found
Computational analysis of contamination in Kojima Lake using upwind-type finite element method
No full textWe have computed the phase of spreading contaminations in Kojima Lake by using the upwind-type finite element method. We have treated the two cases: the pollutant flows from the Sasagase river and from the Kurashiki River. We see that the upwind-type finite element method is effective in both cases, when the diffusion constant is quite small
Belonogaster schulthessi KOJIMA 2001
No full textBelonogaster schulthessi KOJIMA 2001 Belonogaster schulthessi n.sp.: KOJIMA 2001: 14 (descr. Ƌ ♀, Madagascar), 15 (figs 36-47), 19 (key). D i s t r i b u t i o n: Madagascar: Prov. Toamasina: Andekaleka (Rogez). Endemic.Published as part of J. M & Madl, M., 2009, A Catalogue of the Vespidae of the Malagasy Subregion (Insecta, Hymenoptera), pp. 1871-1935 in Linzer biologische Beiträge 41 (2) on page 1900, DOI: 10.5281/zenodo.528023
[Report to Chief J. E. Curry, by an unknown author #1]
No full textReport to Chief J. E. Curry, by an unknown author. The report contains a list of officers who gave depositions to the United States Attorney
[Report to Chief J. E. Curry, by an unknown author #2]
No full textReport to Chief J. E. Curry, by an unknown author. The report contains a list of officers who gave depositions to the United States Attorney
Kojima-1Lb is a mildly cold Neptune around the brightest microlensing host star
No full textWe report the analysis of additional multiband photometry and spectroscopy and new adaptive optics (AO) imaging of the nearby planetary microlensing event TCP J05074264+2447555 (Kojima-1), which was discovered toward the Galactic anticenter in 2017 (Nucita et al.). We confirm the planetary nature of the light-curve anomaly around the peak while finding no additional planetary feature in this event. We also confirm the presence of apparent blending flux and the absence of significant parallax signal reported in the literature. The AO image reveals no contaminating sources, making it most likely that the blending flux comes from the lens star. The measured multiband lens flux, combined with a constraint from the microlensing model, allows us to narrow down the previously unresolved mass and distance of the lens system. We find that the primary lens is a dwarf on the K/M boundary (0.581 +- 0.033 MO) located at 505 +- 47 pc, and the companion (Kojima-1Lb) is a Neptune-mass planet (20.0 +- 2.0 MO) with a semimajor axis of 1.08+0.62-0.18 au. This orbit is a few times smaller than those of typical microlensing planets and is comparable to the snow-line location at young ages. We calculate that the a priori detection probability of Kojima-1Lb is only ~35%, which may imply that Neptunes are common around the snow line, as recently suggested by the transit and radial velocity techniques. The host star is the brightest among the microlensing planetary systems (Ks = 13.7), offering a great opportunity to spectroscopically characterize this system, even with current facilities.</p
Arthula plebeja Ubaidillah and Kojima, sp. nov.
No full textArthula plebeja Ubaidillah and Kojima, sp. nov. (Figs 1–10) Diagnosis. Body mostly brown. Antenna with 23–24 flagellomeres in female, 27–28 flagellomeres in male; propleuron densely punctured; first metasomal tergum not strongly widened posteriorly, its apical width about 1.5 x basal width, not very long, about 2.7 x as long as its apical width; second tergum slightly shorter than or about as long as its apical width. Female. Body length about 7.5–10 mm (n = 5) (holotype about 10 mm), forewing length about 6–7.5 mm (n = 5) (holotype about 7.5 mm). Body mostly brown; stained with black along anterior margin of pronotum and anterior margin of mesoscutum, on prepectus, median part of mesopleoron, sub-lateral and sub-ventral parts of propodeum, and all coxae (Fig. 1). Head and mesosoma with following yellow marks: stripe encircling eye and connected to transverse wide band below toruli, ill-defined band along apical margin of clypeus, narrow band along posterior margin of pronotum, paired oval anterolateral spots on mesoscutum, oval anterior spot on axilla, paired semi-rounded spots on dorsellum, posterior half of propodeum medially, and transverse stripe along posterior margin of each of second to fifth metasomal terga. Head in frontal view (Fig. 2) suboval, nearly 1.4 x as wide as high, in dorsal view (Fig. 3) about 2 x as wide as long; occipital carina complete. Area among ocelli weakly raised, unmargined by either carina or suture; anterior and posterior ocelli nearly the same size; distance between inner margins of posterior ocelli about 1.5 x their diameter, and about 0.8 of distance between outer margin of posterior ocellus and inner eye margin. Eye oval, bare, in frontal view inner margins nearly parallel; in profile maximum width of eye about 2 x that of gena. Malar space about 0.4 of eye height. Face slightly raised medially, with paired broad and shallow oblique grooves diverging dorsally from bases of toruli. Clypeus oval, slightly convex, depressed ventromedially, separated from supraclypeal area by shallow arched groove, which is deeper in the ventrolateral corners. Maxillary palpus with five palpomeres; labial palpus with four palpomeres. Mandible tapering apically, with two teeth; dorsal tooth slightly larger and longer than ventral one (Fig. 4). Antenna filiform, narrowing apically, with 23 (holotype) or 24 flagellomeres (3 paratypes), or number asymmetric (1 paratype); first flagellomere about 2.7 x as long as its apical width, about 1.6 x as long as second flagellomere; second to seventh flagellomeres nearly equal in length; subsequent flagellomeres becoming narrower and shorter towards apical part of flagellum; terminal flagellomere bullet-shaped, nearly 2 x as long as its basal width (but 1.4–1.6 x as long as wide when the flagellum has 24 flagellomeres). Mesonotum closely punctured, densely covered with short setae; notaulus narrow, impressed, traceable in anterior half of mesoscutum; disk of mesoscutum moderately punctured, strongly wrinkled along notauli and over broad area behind their terminus, and alongside margins of lateral disk. Scutellum slightly convex dorsally, finely, closely punctured. Propodeum densely covered with short setae, coarsely reticulated to densely punctured medially and laterally, with short longitudinal rugae on anterior margin; median longitudinal carina absent. Mesopleuron densely covered with short setae, closely punctured, most coarsely on median disk; propodeal spiracle elliptical. Forewing (Fig. 5) radial cell 3.0– 3.5 x as long as wide; costal notch distinct; 2 m-cu with two bullae. Hind wing with distal abscissa of 1 A complete. Metasoma finely and closely punctured, densely covered with short setae. First tergum (Figs 6, 7) weakly widening posteriorly, in dorsal view apical width about 1.5 x basal width, length (measured in lateral view as the distance from the apical margin of basal slit to posterodorsal corner of the tergum) about 2.7 x its apical width, without glymma, basal half with two weak, sub-median carinae; spiracle strongly produced as tubercle at mid-length of the tergum; second tergum 0.9 –1.0x as long as its apical width; apical width of second tergum 2.0– 2.4 that of first tergum. Ovipositor relatively short (Figs 1, 8), about as long as length of terminal sternum; ovipositor sheath hairy. Male. Body length about 8–8.5 mm (n = 6), forewing length about 6.5–7 mm (n = 6). Similar to female, but apical yellow bands on metasomal segments wider than in female (Figs 9, 10); antenna with 27–28 flagellomeres; first flagellomere proportionally slightly longer than in female, nearly 3 x as long as its apical width; terminal flagellomere 1.8–2.3 x and 1.3–1.7 x as long as its basal width for flagellum with 27 and 28 flagellomeres, respectively. Type series. Holotype: Ƥ (repository: Australian National Insect Collection, CSIRO, Canberra), labeled (slash indicates new line) “ AUSTRALIA, N.S.W. / Cabbage Tree Creek / (along Kings Highway) / 35 ° 34 ’S, 105 °02’E / emerged 10.vii. 2004 from / Ropalidia plebeiana nest / kept in laboratory / Nest collected iiiiv. 2004 / J. Kojima” and “ HOLOTYPE / female / Arthula plebeja Ubaidillah & Kojima ”. Paratypes: 10 specimens (Australian National Insect Collection, Museum Zoologicum Bogoriense and Natural History Collection of Ibaraki University): 2 Ƥ 23, same data as holotype; 1 Ƥ, “ Australia, N.S.W. / Cabbage Tree Creek / 35 ° 34 ’S, 105 °02’E / 29.ii. 2000. J. Kojima”; 1 Ƥ 13, “ Australia, ATC / Canberra, emerged in vii. 2004 / from Ropalidia plebeiana nest / collected in iii-iv 2004 / J. Kojima; 33, “ Australia, NSW / 35 ° 39 ’S, 105 °09’E / 1.9 km in driveway distance / from Batemans Bay in / direction of Canberra / emerged on 16.vii. 2004 [12.viii. 2004 (for 23)] / from R. plebeiana nests / coll. in iii-iv 2004, J. Kojima.” Etymology. The specific name, plebeja, is a Latin adjective meaning “plebeian,” used after the specific name of the host paper wasp, Icaria plebeja de Saussure, 1863, non 1862 (= Ropalidia plebeiana Richards, 1978). Remarks. This species is similar to A. flavofasciata in the shape of the antenna and metasoma, both of which seem to be key characters to distinguish Arthula species, but can be easily distinguished from A. flavofasciata by having the first metasomal tergum weakly widened posteriorly (apical width about 1.5 x as wide as the basal width vs. about 2.0x in A. flavofasciata), and the dorsal surface of the same tergum in profile more or less smoothly curved (angled in A. flavofasciata). Arthula plebeja is distinctly different from the other two species, A. brunneocornis and A. formosanus, by the female antenna having the smallest number of flagellomeres (23–24 in A. plebeja vs. 26–27 in A. brunneocornis vs. 28 in A. formosanus), and in the proportionally shorter first two metasomal segments (in A. brunneocornis and A. formosanus, the first tergum much elongated and the second tergum distinctly longer than the apical width).Published as part of Ubaidillah, Rosichon, Yamaguchi, Goshi & Kojima, Jun-Ichi, 2009, A new Arthula Cameron (Ichneumonidae, Cryptinae) parasitoid of Ropalidia plebeiana Richards (Vespidae) and host of Amoturoides breviscapus Girault (Torymidae) (Hymenoptera), pp. 45-50 in Zootaxa 2274 on pages 46-47, DOI: 10.5281/zenodo.19104
Parapolybia crocea Saito-Morooka, Nguyen & Kojima, sp. nov.
No full textParapolybia crocea Saito-Morooka, Nguyen & Kojima, sp. nov. (Figs 3, 4, 53 –64, 84, 87) Parapolybia indica: Yamane et al. 1995: 75 (syn.: P. takasagona Sonan, 1944), 77; Kurzenko 1995: 282 (key); Yamane et al. 1999: 452. Parapolybia indica indica: van der Vecht 1966: 26 (key), 27, fig. 11 a, part. Diagnosis. This species is similar to P. indica, but distinguished from the latter by the following characters: female paired longitudinal yellow band on mesoscutum and paired yellow spots on T 2 distinct; male genital volsella apically rounded. Type material. HOLOTYPE: ♀, JAPAN: Shimonomiya, Daigo, Ibaraki, 15.ix.2014, 36° 49 ' 15 ''N, 140 ° 23 '07''E, 190 m, F. S.-Morooka [IUNH]. PARATYPES. JAPAN: Ibaraki: 2 ♀ [IUNH], Mito, 24.vii. 2008, S. Nohara; 4 ♀ 2 ♂ [IUNH], Daigo, 24–27.viii. 2010, J. Kojima; 2 ♂ [IUNH], Diago, 15.ix. 2014, F. S.-Morooka; 3 ♀ [IUNH] Shimonomiya, Daigo, 36 ° 49 ' 15 ''N 140 ° 23 '07.5''E, 190 m, 30.vii. 2014, J. Kojima; 1 ♂ [NIAES], Kouyadai, Tsukuba, 15–26.ix. 1993, T. Matsumura; Tokyo: 14 ♂ [NIAES], Mt. Takao, J. Minamikawa, [6 ♂, 9.ix. 1963; 1 ♂, 15.ix. 1963; 6 ♂, 22.ix. 1963; 1 ♂, 29.ix. 1963]; Chiba: 2 ♀ [NIAES], Godaibata, Kimitsu, M. Nitta et al. [1 ♀, 2– 9.vii. 1997; 1 ♀, 25.vi.– 2.vii. 1997]; Yamanashi: 2 ♂ [NIAES], Shiotu, 14.ix. 1964. KOREA: Seoul: 20 ♀ (IUNH), 37 ° 28 'N, 126 ° 57 'E, Seoul National Univ., 12.viii. 2010, J. Kojima, [10 ♀, Nest#Pp-K- 2010 - 2; 10 ♀, Nest#Pp-K- 2010 - 3]. CHINA: Guangdong (=Kwangtung): 1 ♀ (BPBM), N. Kwangtung, Loh-Chang Dist., 11.ix. 1947, J.L. Gressitt. VIETNAM: Vinh Phuc: 2 ♀ 1 ♂ (IUNH), Tam Dao, 900–1200 m, 30.vii– 3.viii. 2012, D.T. Tran. Other material. JAPAN: Akita: 3 ♀ (IUNH), Yuse SA, Kazuno, 40 °07' 33 ''N 140 ° 50 '06''E, ca. 275m, 6.ix. 2014, J. Kojima; 10 ♀ (IUNH), Kosaka PA, Kosaka, 40 ° 20 ' 40 ''N 140 ° 43 ' 53 ''E, ca. 260 m, 5.x. 2014, J. Kojima; Iwate: 3 ♀ (IUNH), Kinshuko SA, Nishiwaga, 39 ° 17 ' 56 ''N 140 ° 50 ' 35 ''E, ca. 310 m, 5.ix. 2014, J. Kojima; Fukushima: 1 ♀ (IUNH), Ishikawa-machi, 37 °08' 26.90 ''N 140 ° 27 ' 39.46 ''E, ca. 400 m, 14.viii– 25.xi. 2013, Bait Traps, F. S.- Morooka; Saitama: 1 ♀ (IUNH), Kumagaya, 36 °06'N; 139 ° 22 'E, 50 m, 9–17.viii. 2012, Bait Traps, F.S.-Morooka; 1 ♀ (IUNH), Nourin park, Fukaya, 36 °06'N; 139 ° 17 'E, 90 m, F. S.-Morooka; Tokyo: 1 ♀ (SEHU), Mt. Mitake, 23.vi. 1962, K. Kondo; 2 ♂, Mt. Takao, 27.viii. 1966, M. Suwa; Toyama: 1 ♀ (SEHU), Ooiwa, Toyama, 27.vii. 1983, S. Takagi; Gifu: 1 ♀ (SEHU), Dachi, Tokishi, 8.x– 8.xii. 2007, Malaise Trap, S. Tsukamoto; Shizuoka: 3 ♀ 4 ♂ (SEHU), Shizuoka, Hirano, T. Hattori, (3 ♀ 3 ♂, 18.ix.1977, 1 ♂, 14.ix. 1977); Wakayama: 1 ♂ (SEHU), Kozagawa, Wakayama-shi, 21.ix. 1974, T. Kumata; 2 ♀ 1 ♂ (SEHU), Kiiohshima, Kushimoto-cho, E. Ikeda [2 ♀, 29.iv.1991, 1 ♂, 6.ix. 1990]; 1 ♀ (IUNH), Megurogawa, Wakayama, 24.vii. 2000, J. Kojima; Kochi: 1 ♀ (SEHU), Kochi-shi, 16.ix. 1934, K. Oike; Nagasaki: 2 ♀ (IUNH), Mine, Tsushima, 34 ° 27 ' 41 ''N 129 ° 18 ' 42 ''E, 26.vii. 2014, J. Kojima; Fukuoka: 3 ♀ (SEHU), [2 ♀, Hisayama, Fukuoka, 2.vii. 1992, E. Ikeda; Kyoto: 1 ♀, Daimonjiyma, Sakyo, Kyoto[-shi], 28.vii. 1992]; Kumamoto: 1 ♂ (SEHU), Neko-Dake, Takamori-cho, 12.ix. 2006, S. Imamura; 1 ♀, Otogase, chouyou-son, 30.iv. 2007, S. Imamura; Kagoshima: 1 ♀ (SEHU), Mt. Takakuma, 26.iv. 1967, T. Kocha; 1 ♀ (SEHU), Kirishima jingu, 500–900 m, 10–12.vi. 1980, M. Suwa; 2 ♀ (SEHU), 31 ° 53 'N, 130 ° 50 'E, Kirishima onsen, Makizono-cho, 24–25.viii. 2002, T. Yoshida; 3 ♀ (SEHU), Y. Rokusawa [1 ♀, vi. 2004; 1 ♀, Oyamda-cho, Kagoshima-shi, 3.vii. 2004; 1 ♀, Kenminno-mori, Aira-cho, 14.v. 2004]; 4 ♀ (SEHU), Isa, Okujissou, 28.vii. 2007, T. Yamasaki. CHINA: Fujian: 1 ♀ (BPBM), Foochow, vii. 1924, J.F. Illingworth; Hong Kong: 1 ♀ (BPBM), N.T. Taipokau, 15.vi. 1964, W.J. Voss & W.M. Hui. TAIWAN: Taipei: 1 ♀ (NMNS), Yangminshan, 27–28.vii. 1998, M.M. Yang & M.L. Chan; Yilan: 1 ♀ (TARI, PARATYPE of Paraplybia takasagona Sonan), Taiheizan [=Taipingshan], ii. 1930, S. Minowa, 84; Taoyuan: 1 ♀ (NMNS), No.07 Prov. RD, 43–57 km, 11–12.ix. 1999, M.M. Yang; Nantou: 1 ♀ (NMNS), Lienhuachin, 2.v– 12.vi. 2001, C.S. Lin & W.T. Yang. VIETNAM: Cao Bang: 2 ♀ (IUNH), Thanh Cong, Nguyen Binh, J. Kojima et al. [1 ♀, 22 ° 32.5 'N, 105 ° 52 'E, 7.viii. 2012; 1 ♀, 22 ° 34 'N, 105 ° 53 'E, 9.viii. 2012]; Hoa Binh: 8 ♀ (IUNH / IEBR), Pa Co, Mai Chau, 20 ° 44.5 'N, 104 ° 53.5 'E, 1450 m, 27.viii. 2006, L.T.P. Nguyen, F. Saito & J. Kojima, Nest#VN-Pp- 2006 - 16. LAOS: Vientiane: 4 ♀ (BPBM), Ban Van Heue, [2 ♀, 14–15.iv. 1965, J.L. Gressitt; 1 ♀, 20 km E of Phou-know-kuei, 15–31.iv. 1965, native collector; 1 ♀, 20 km E of Phou-know-kuei, 1–15.iv. 1965, J.A. Rondon]. THAILAND: Chon Buri: 1 ♀ (BPBM), Ban Bang Phra, 6.iii. 1968, D.E. Hardy. Description. FEMALE. Body length 12.0–15.0 mm; fore wing length 10.5–14.5 mm. Head in frontal view, about as wide as high (Fig. 53). Gena developed, somewhat swollen laterally, but hardly visible in frontal view of head (Fig. 53), in lateral view about as wide as eye (Fig. 54). Ocelli close to each other (Fig. 55); distance between anterior and posterior ocelli rarely longer than half of Od; POD less than Od; anterior ocellus diameter 0.25–0.28 mm, larger than Od (0.22–0.27 mm); OOD 1.9 × as large as Od. Eyes with sparse, short setae. T 1 long (2.9–3.9 mm long, Figs 56–57), posteriorly swollen dorsally, 3.0 × longer than the maximum height, 2.5 × as long as its own maximum width. Color. Body ground color yellow (Fig. 3); following parts brown to dark brown: scape and pedicel dorsally, anterior margin of clypeus, teeth of mandible, narrow ill-defined band in bottom of supraclypeal area, spot above antennal socket, vertex, median spot on pronotal collar, narrow band along posterodorsal margin of pronotum, median furrow of mesopleuron, anterior margin of mesoscutum, mesoscutum except for paired longitudinal yellow bands, anterior margin, median line and dorsolateral lines of propodeum, dorsal side of T 1, T 2 –T 6 except for paired large basal yellow spots, posterior margin of S 2 –S 5. Legs yellow; mid and hind trochanters, dorsal line of femur, apical one-third of tibia, brown. Wings semihyaline, pale brown (Figs 3–4). MALE. Body length 12.0–13.0 mm; fore wing length 12.0–13.0 mm. Head in frontal view 0.9 × as wide as high (Fig. 58). Ocelli close to each other (Fig. 59); distance between anterior and posterior ocelli less than Od; POD less than Od; anterior ocellus diameter 0.24–0.29 mm, larger than Od (0.21–0.26 mm); OOD about equal to Od. F 11 1.6 × as long as F 10 (0.7–0.8 mm, Fig. 60). T 1 less swollen than in female (3.1–3.4 mm long, Figs 61–62), 3.3 × longer than the maximum height, 2.8 × as long as its own maximum width. Parameral spine with dense hairy setae (Fig. 63). Digitus apically slightly bulged. Proximal margin of aedeagus ventrally produced (Fig. 64). Color. Similar to female, but narrow brown band at bottom of supraclypeal area and small spot above antennal socket absent. Etymology. The specific name originates from a Latine croceus (yellow, golden) with reference to the body coloration. Distribution. Japan (except Hokkaido and south of Kuchino-jima island in the Nansei Islands) (Yamane et al. 1999, Takamizawa 2005, cited as “ Parapolybia indica ”), South Korea, China (Guangdong, Fujian, Hong Kong), Taiwan, Thailand, Laos, Vietnam (North Vietnam). Remarks. In addition to the references listed in the synonimies, all of the refernces describing biological aspects of the Japanese population under “ Parapolybia indica ”, such as Sekijima et al. (1981), Sugiura et al. (1983 a, b), Kojima (1992 a, b) and Saito-Morooka (2014), are of this species.Published as part of Saito-Morooka, Fuki, Nguyen, Lien T. P. & Kojima, Jun-Ichi, 2015, Review of the paper wasps of the Parapolybia indica species-group (Hymenoptera: Vespidae, Polistinae) in eastern parts of Asia, pp. 215-235 in Zootaxa 3947 (2) on pages 227-229, DOI: 10.11646/zootaxa.3947.2.5, http://zenodo.org/record/23272
Lyapunov Stability Analysis of Higher Order 2D Systems
No full textWe prove a necessary and sufficient condition for the asymptotic stability of a 2D system described by a system of higher-order linear partial difference equations. We use the definition of asymptotic stability given by Valcher in “Characteristic Cones and Stability Properties of Two-Dimensional Autonomous Behaviors”, IEEE Trans. Circ. Syst. — Part I: Fundamental Theory and Applications, vol. 47, no. 3, pp. 290–302, 2000. This property is shown to be equivalent to the existence of a vector Lyapunov functional satisfying certain positivity conditions together with its divergence along the system trajectories. We use the behavioral framework and the calculus of quadratic difference forms based on four variable polynomial algebra
A polynomial algebraic approach to Lyapunov stability analysis of higher-order 2D systems
No full textWe introduce a four-variable polynomial matrix equation which plays an essential role in the stability analysis of discrete 2-D systems and in the computation of Lyapunov functions for such systems; we call this the 2-D polynomial Lyapunov equation (2-D PLE). We also give necessary and sufficient conditions for the stability of "square" 2-D systems based on solutions of the 2-D PLE satisfying additional properties
Characterization of solutions of the discrete-time algebraic Riccati equation based on quadratic difference forms
No full textThis paper is concerned with a characterization of all symmetric solutions to the discrete-time algebraic Riccati equation (DARE). Dissipation theory and quadratic difference forms from the behavioral approach play a central role in this paper. Along the line of the continuous-time results due to Trentelman and Rapisarda [H.L. Trentelman, P. Rapisarda, Pick matrix conditions for sign-definite solutions of the algebraic Riccati equation, SIAM J. Contr. Optim. 40 (3) (2001) 969–991], we show that the solvability of the DARE is equivalent to a certain dissipativity of the associated discrete-time state space system. As a main result, we characterize all unmixed solutions of the DARE using the Pick matrix obtained from the quadratic difference forms. This characterization leads to a necessary and sufficient condition for the existence of a non-negative definite solution. It should be noted that, when we study the DARE and the dissipativity of the discrete-time system, there exist two difficulties which are not seen in the continuous-time case. One is the existence of a storage function which is not a quadratic function of state. Another is the cancellation between the zero and infinite singularities of the dipolynomial spectral matrix associated with the DARE, due to the infinite generalized eigenvalues of the associated Hamiltonian pencil. One of the main contributions of this paper is to demonstrate how to resolve these difficulties
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