183,647 research outputs found
Acoustic radiation due to scattering of T-S wave by the mean-flow distortion induced by steady local suction
No full textSubstantial sound waves can be generated by boundary-layer instability modes when the latter are scattered by a rapid mean-flow distortion. This is a rather generic mechanism and operates when an oncoming T-S wave is scattered by a steady local suction slot. This paper focuses on this problem by extending a recently developed Local Scattering Theory (Wu & Dong, J. Fluid Mech. submitted), where a so-called transmission coefficient, defined as the ratio of the T-S wave amplitude downstream of the scatter to that upstream, is introduced to characterize the effect of a local scatter on boundary-layer instability and transition. As in the earlier work, the mathematical formulation is based on triple-deck formulism, but in order to accommodate the acoustic far field, which was not considered in the paper mentioned, the unsteady terms in the upper deck, which play a leading-order role in radiation, are retained, and the influence of the radiated sound on the near-wall perturbation is included. The upper deck equation for the pressure is the Helmholtz equation rather than the Laplace equation. This leads to a modified pressure-displacement relation, which is coupled with the linearized boundary-layer equations in the lower deck. Discretization of the whole system formulates a generalized eigenvalue problem, which is solved numerically. It is found that suction suppresses oncoming T-S waves, and this effect increases with the suction velocity and the slot width. The directivity is ndependent of the flow parameters only when the Mach number is low. The intensity of the radiated sound in general increases with the frequency, the suction velocity and the width of the suction slot. Interestingly, for O(1) suction velocities, the radiated sound is very weak, indicating that the gain of stabilizing effect does not cause aeroacoustic penalty
A boundary element model for nonlinear viscoelasticity
No full textThe boundary element methodology is applied to the analysis of non-linear viscoelastic solids. Theadopted non-linear model uses the same relaxation moduli as the respective linear relations but with a time shiftdepending on the volumetric strain. Nonlinearity introduces an irreducible domain integral into the originalintegral equation derived for linear viscoelastic solids. This necessitates the evaluation of domain strains, whichrelies on proper differentiation of an integral with a strong kernel singularity. A time domain formulation isimplemented through a numerical integration algorithm. The effectiveness of the developed numerical tool isdemonstrated through the analysis of a plate with a central crack. The results are compared with respectivepredictions by the finite element metho
Cidariplura maraho Wu & Owada 2013
No full textCidariplura maraho Wu & Owada, 2013 (Figs 15, 16, 33, 42, 52) Cidariplura maraho Wu & Owada, in Wu et al., 2013: 151, figs 14–16, 41, 42, 62, 73, 82. Type material. Holotype, ♂, Taiwan, Nantou County, Meifeng, 2,100 m, 29. VI. 2012, TFRI147244 S. Wu & W. C. Chang leg. (TFRI) (Fig. 15). Paratypes (9♂ 4♀): the same collecting locality as that of holotype, 1♂, 18. VII. 1990, TFRI00010165, Y. C. Chang leg.; the same locality, 3♂, 20. VII. 2011, TFRI00128724 ♂, S. Wu & W. C. Chang leg. (TFRI); Hualien, Ci’en, 1,950 m, 2♂, 28. VI. 2011, S. Wu & W. C. Chang leg.; the same locality, 1♂, 18. VII. 2011, S. Wu & W. C. Chang leg. (TFRI); Pilu-Shenmu, 2,000 m, 1♀, 16.VII. 2012, M. Owada & L. C. Shih leg. (ESRI); Nantou, Biluxi, 1♂, 12. VII. 2011, C. M. Fu leg.; Turnyuan, 1♀, 23. VI. 2007, 1,950 m, C. M. Fu leg. (NMNS); Taichung, Wuling, 1,850 m, 1♀, 10–12. VIII. 1990, M. Owada leg. (NSMT); Hualien, Tsu’en, 1,990 m, 1♂, 26. VI. 1989, M. Owada leg. (NSMT); Nantou, Hotso [Lushan Spa], 1♀, 26–29. VI. 1973, M. Owada leg. (NSMT). Additional material examined (2♂ 2♀). Hualien, Tsu’en, 2,000 m, 1♀, 13. VII. 2015, NSMT3284 ♀, M. Owada & L. Shih leg. (NSMT); Nantou, Sunlinksea, 1,700 m, 1♂, 25. VI. 2017, NSMT3283 ♂, M. Owada & L. Shih leg. (NSMT); Kaohsiung, Tianchi-2, 2,280 m, 1♂ 1♀, 6. VII. 2015, M. Owada & C.-M. Fu leg. (NSMT). Diagnosis. The species is easily distinguished from other species in C. gladiata complex due to the paler ground coloration of the wings and the more contrasting forewing medial region, the less curved transversal lines on both wings, and the medial part of the corpus bursae, which is incised with longitudinal wrinkles. Distribution and phenology. Endemic to Taiwan. The adults occur from June to August.Published as part of Wu, Shipher, Owada, Mamoru & Wang, Min, 2019, Review of Cidariplura Butler, 1879 (Lepidoptera, Erebidae, Herminiinae). Part 1: the Cidariplura gladiata species complex, pp. 489-502 in Zootaxa 4668 (4) on page 496, DOI: 10.11646/zootaxa.4668.4.3, http://zenodo.org/record/344986
Cidariplura shanmeii Wu & Owada 2013
No full textCidariplura shanmeii Wu & Owada, 2013 (Figs 17, 18, 28, 43, 53) Cidariplura gladiata ab. ochreimacula Strand, 1919: 149, aberration, unavailable infrasubspecific name. Cidariplura gladiata: Wang, 1994: 397; Wang, 2001: 12, nec Butler, 1879. Cidariplura shanmeii Wu & Owada, in Wu et al., 2013: 148, figs 3, 4, 7, 8, part. Type material. Holotype, ♂, Taiwan, Chiayi Co., Shanmei, 800 m, 8. VII. 2011, TFRI128721, S. Wu & W. C. Chang leg. (TFRI) (Fig. 17). Paratypes (8♂ 5♀): Taiwan, the same collecting locality as that of the holotype, 1♂, 5. VIII. 2011, W. C. Chang & S. Wu leg.; the same locality, 1♂, 2. XI. 2011, W. C. Chang & S. Wu leg.; Nantou, Lianhuachi, 600 m, 1♂, 21. V. 2009, C. C. Kuo leg.; the same locality, 1♂, 10. V. 2010, TFRI151527, C. C. Kuo leg.; the same locality, 3♂, 23. VII. 2009, C. C. Kuo leg.; the same locality, 1♂, 12. VII. 2010, C. C. Kuo leg.; 1♂, 10. VIII. 2010, C. C. Kuo leg.; Pingtung, Shouka, 1♀, 450 m, 27. X. 2011, Y. C. Lin leg.; the same locality, 2♀, 22. III. 2012, Y. C. Lin leg.; the same locality, 1♂, 19. VII. 2012, Y. C. Lin leg.; the same locality, 2♀, 15. VIII. 2012, Y. C. Lin leg.; Hualien, Guanfu, 1 ♂, 180 m, 9. VIII. 2010, leg. Y. C. Lin leg.; the same locality, 1♂, 13. IX. 2010, Y. C. Lin leg. (TFRI). Additional material examined. Taiwan. Ilan, Fushan Botanical Garden, 700 m, 1♂, 12, 15–16. VI. 2015, NSMT3305 ♂, M. Owada & S. Wu leg.; the same locality, 2♂ 1♀, 12. V. 2019, NSMT3474 ♂, NSMT3475 ♀, M. Owada & S. Wu leg. (NSMT); Nantou, Lienhuachih [=Lianhuachi], 700 m, 2♂, 17–18. VII. 2012, NSMT3297 ♂ (NSMT), NSMT3300 ♂ (ESRI), M. Owada & L. Shih leg., Huisun Linchang, 770 m, 2♂, 21–22. VI. 2017, NSMT3306 ♂ (NSMT), NSMT3307 ♂ (ESRI), M. Owada & L. Shih leg., Aowanda, 1,000 m, 1♂, 9. V. 2013, NSMT3281 ♂ (NSMT), M. Owada, L. Shih & Y. Chen leg. Notes. Wu et al. (2013) described C. shanmeii with the illustration of the holotype of C. shanmeii, however the illustrated structures in Wu et al. (2013: figs 37, 38, male; 64, female; 69, labial palpus; 80, male foreleg), actually belong to the new species, C. hbun sp. nov., described below. Diagnosis. Externally C. shanmeii and C. hbun are difficult to be separated, but the former species can be distinguished from the latter by the narrowed white forewing discocellular spot, rather than a wider and more yellowish-white spot; the costal process of the valva is digitiform rather than stouter and curved downwards; the distinctively shorter distal portion of valva rather than nearly equal in length as costal process; the digitiform, straight costal process rather than curved ventrally and tapering; the saccular process is extremely small and curved rather than robust and rod-like pointing parallelly with distal portion of valva; the ductus bursae is extremely narrowed compared to the moderate width of other species in the complex. Re-description. Due to the existence of specimens belonging to both C. shanmeii and C. hbun sp. nov. in the paratype series of C. shanmeii (sensu Wu & Owada, in Wu et al., 2013), we re-describe C. shanmeii herein to clarify the identity of that species. Measurements. Forewing length 12–14 mm in males (n= 17); 12–14 mm in females (n= 5). Eye round; antenna ciliate, male with a pair of long bristles on each segment, length of bristle 2 X diameter of shaft in median region. Head, all segments of thorax as well as femur, tibia and 1st tarsal segment chocolate brown. Male labial palpus (Fig. 28) modified as follows: 1st segment very long, upcurved along frons, surpassing vertex, smoothly covered with ordinary scales; 2nd segment bent at a right angle from the 1st, slender, slightly curved, 0. 5 X shorter than 1st, reaching the anterior part of thorax, internally with specialized ochreous scales which are elongated and enlarged at their apices; 3rd segment long, 3 X longer than 2nd, basal part of labial palpus as wide as medial part, internally with long ochreous scales slender and almost twice as long as those in the 2 nd segment. Labial palpus in female: 3 rd shorter than 2 nd, slender, tapering towards apex. Legs: male foretibia with apical spine. Forewing broad, slightly excurved, apex nearly forming right angle; ground coloration chocolate brown; antemedial and postmedial line slender, light ochreous, the former oblique, wave-like, the latter smoothly excurved outward at discal cell part; discocellular spot white, slender and lunate-shaped; submarginal line slender, ochreous, wave-like; outer margin ochreous; marginal scales chocolate brown. Hindwing chocolate brown; medial line ochreous with one ochreous spot situating at outside of tornal area; outer margin ochreous; marginal scales chocolate brown. Abdomen brown, 8th segment unmodified. Male genitalia (Fig. 43)—Uncus broad, stout, apex hook-like. Tegumen and vinculum long, equal in length; saccus V-shaped, medial part elongated anteriorly. Valva trifurcate, costal process, straight and digitiform, distal portion of valva broad, saccular process short, curved and digitiform. Juxta plate-like, transtilla indistinct. Aedeagus stout, straight, 1. 25 X longer than valva; vesica densly scobinate without cornutus. Female genitalia (Fig. 53)—Papillae anales membranous with short hair-like setae; both pairs of apophyses slender, moderate length; ductus bursae as long as corpus bursae, with a pair of slender lateral sclerites. Corpus bursae elliptical, basal half part surrounded by dense internal spinose patch; ductus seminalis arising from lateral base of corpus bursae, broadened and coiled basally. Distribution and phenology. Endemic to Taiwan. The adults occasionally occur from March to November.Published as part of Wu, Shipher, Owada, Mamoru & Wang, Min, 2019, Review of Cidariplura Butler, 1879 (Lepidoptera, Erebidae, Herminiinae). Part 1: the Cidariplura gladiata species complex, pp. 489-502 in Zootaxa 4668 (4) on pages 497-498, DOI: 10.11646/zootaxa.4668.4.3, http://zenodo.org/record/344986
Bønnelycke, E-M. S., Giacon, T. A., Bosco, G., Kainerstorfer, J. M., Paganini, M., Ruesch, A., Wu, J., McKnight, J. C. "Cerebral haemodynamic and systemic physiological changes in trained freedivers completing sled-assisted dives to two different depths"
No full textRaw NIRS and arterial blood gas data included in the analysis for the following paper: Bønnelycke, E-M. S., Giacon, T. A., Bosco, G., Kainerstorfer, J. M., Paganini, M., Ruesch, A., Wu, J., McKnight, J. C. "Cerebral haemodynamic and systemic physiological changes in trained freedivers completing sled-assisted dives to two different depths".</p
Control and Filtering for Discrete Linear Repetitive Processes with H infty and ell 2--ell infty Performance
No full textRepetitive processes are characterized by a series of sweeps, termed passes, through a set of dynamics defined over a finite duration known as the pass length. On each pass an output, termed the pass profile, is produced which acts as a forcing function on, and hence contributes to, the dynamics of the next pass profile. This can lead to oscillations which increase in amplitude in the pass to pass direction and cannot be controlled by standard control laws. Here we give new results on the design of physically based control laws for the sub-class of so-called discrete linear repetitive processes which arise in applications areas such as iterative learning control. The main contribution is to show how control law design can be undertaken within the framework of a general robust filtering problem with guaranteed levels of performance. In particular, we develop algorithms for the design of an H? and dynamic output feedback controller and filter which guarantees that the resulting controlled (filtering error) process, respectively, is stable along the pass and has prescribed disturbance attenuation performance as measured by and – norms
On the Pontryagin-Steenrod-Wu theorem
No full textWe present a short and direct proof (based on the Pontryagin-Thom construction) of the following Pontryagin-Steenrod-Wu theorem: (a) Let M be a connected orientable closed smooth (n+1)-manifold, n>=3. Define the degree map deg: \pi^n(M) \to H^n(M;Z) by the formula deg f=f*[S^n], where [S^n] \in H^n(M;Z) is the fundamental class. The degree map is bijective if there exists \beta \in H_2(M,Z/2Z) such that \beta \cdot w_2(M)\ne 0. If such \beta does not exist, then deg is a 2-1 map; and (b) Let M be an orientable closed smooth (n+2)-manifold, n>=3. An element \alpha lies in the image of the degree map if and only if \rho_2 \alpha \cdot w_2(M)=0, where \rho_2 :Z \to Z/2Z is reduction modulo 2
Rome. The Centre(s) Elsewhere
No full textRome: The Centre(s) Elsewhere is the result of a Berlage Institute postgraduate studio led by Pier Vittorio Aureli and Martino Tattara, in collaboration with Gabriele Mastrigli. The book proposes both the definition of a new urban strategy for the city of Rome and a critical framework through which to understand the city’s history. Going beyond the grandeur of the past and the uncertainty of the present, Rome: The Centre(s) Elsewhere offers a project for the city’s possible future by reclaiming the greatest and yet currently neglected asset of its urban structure: the consular roads system. The book is a critical and concise pamphlet about urban design and the project of the city. It represents an attempt to gather into one approach the issues of large-scale design, political thinking, and urban history. The publication is based on a research at the Berlage Institute Rotterdam entitled Rome: The Centre(s) Elsewhere, which took place during the 2008–2009 academic year. The research was presented first at The Berlage Institute in Rotterdam then in an international conference and an exhibition entitled Rome: The Centre(s) Elsewhere, held at the Casa dell’Architettura from 9 June to 7 July 2010 and organized as part of the Festa dell’Architettura of Rome 2010. Together with being co-curator of the research exhibition, Gabriele Mastrigli is author of the exhibition design
Pupopsis subtorquilla Wu & Gao, 2010, sp. nov.
No full text11. Pupopsis subtorquilla sp. nov. Figs. 1, 3 I, 11 A– 11 C; Table 2 Type material. Holotype: HBUMM-05429–specimen 2 (fms), Yuxushan Hill, 10 km north of town of Wenxian, site No. 0 45, 1070 m a.s.l., 32 ° 57 ʹ 35.5 ʹ N, 104 ° 40 ʹ 41.6 ʹ E, Wenxian County, S. Gansu, China, 2006 –IX– 27, leg. M. Wu, J. Liu, W. Zheng & L. Gao. Paratypes: HBUMM-05429–specimens 1, 3– 13, (12 fms), same collection data as holotype; HBUMM-05545–specimens 1–3, (3 fms), 829 m a.s.l., 32 ° 51 ʹ 44.7 ʹ N, 104 ° 50 ʹ 48.2 ʹ E, Hendan Village, along national highway no. 212, S. Gansu, China, 2006 –IX– 29, leg. M. Wu, J. Liu, W. Zheng & L. Gao; HBUMM- 0 0 349 (1 fms), Bikou, 720 m a.s.l., 32 ° 48 ʹ, 105 ° 12 ʹE, Wenxian County, Gansu, China, 2004 –IV– 18, leg. M. Wu; HBUMM-00314–specimens 1–4 (4 fms), Wenxian, Shangdanpu, 1450 m a.s.l., 33 °0ʹN, 104 ° 36 ʹE, 2004 –IV– 22, leg. M. Wu; HBUMM-00337–specimens 1–3 (3 fms), Wenxian, 2004 –IV– 7, leg. M. Wu. Type locality. Yuxushan Hill, 10 km north of Wenxian, Wenxian County, S. Gansu. Material examined. Type material. Distribution. Wenxian County, Gansu. Etymology. The new species is named for its congener, P. torquilla, to which it is taxonomically closest. The epithet is a noun in apposition. Diagnosis. Shell with 6.500–7.500 whorls. Height 7.0– 8.4, diam. maj. 3.5–4.5. Parietal tooth present. Columellar tooth prominent and expanded inward. Palatal tooth ridge-like. Shell. Bulbous-ovate; apex not acuminate; dextral; thick-shelled; solid; opaque; glossy; with 6.500–7.025 – 7.500 whorls. Whorls never spirally grooved; somewhat convex. Embryonic shell smooth; not polished; with 1.250–1.554 – 2.500 whorls. Postnuclear whorls wrinkled. Suture simple. Last whorl gradually ascending toward aperture; rounded at periphery. Shell 7.0– 7.8–8.4 high; 3.5 –4.0– 4.5 in diam. maj. Height/diam. maj. ratio 1.79– 1.97 – 2.30. Aperture subovate; almost vertical; its insertions separated; 2.5–2.9 – 3.4 high, 2.3–2.6 – 2.8 wide. Ratio of shell height to aperture height 2.27–2.71 – 3.16. Palatal margin rounded. Peristome expanded, sharp. Palatal tooth ridge-like, extending through nearly the entire body whorl. Parietal callus distinct. Angular tubercle and parietal tooth present. Columellar margin reflexed; with one tooth which is hardly visible in apertural view but extends inward along the columella. Umbilicus a narrow slit. Shell, including upper whorls, uniformly light corneousbrown; aperture white. Remarks. The new species is close to P. torquilla due to similar size and the development of the apertural armature. However, the shell of the new species is much more swollen, with much fewer whorls and the columellar tooth is almost invisible in apertural view.Published as part of Wu, Min & Gao, Linhui, 2010, A review of the genus Pupopsis Gredler, 1898 (Gastropoda: Stylommatophora: Enidae), with the descriptions of eight new species from China, pp. 1-27 in Zootaxa 2725 on page 20, DOI: 10.5281/zenodo.19998
- …
