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Review: Artful Subversion: Empress Dowager Cixi’s Image Making by Ying-chen Peng
Full text linkReview: Artful Subversion: Empress Dowager Cixi’s Image Making by Ying-chen Peng. Yale University Press, January 2023. 208 p. ill. ISBN 978-0-300-26343-5 (h/c), $50.00. Reviewed May 2023 by Katie Edmiston, Arts, Media & Design Librarian, Central Michigan University, Park Library, [email protected]
Related data for: Contention Minimized Bypassing in SMART NoC
No full textThis dataset contains keycodes for the proposed algorithms in the paper
Replication Data for: Reduced Worst-Case Communication Latency Using Single-Cycle Multi-Hop Traversal Network-on-Chip
No full textThis dataset contains the keycodes of this paper
<em>Artful Subversion: Empress Dowager Cixi’s Image Making</em>. By Ying-chen Peng. New Haven: Yale University Press, 2023. ISBN 978-0-300-26343-5. ix+196 pp. $50.
No full textReview of Ying-chen Peng, Artful Subversion: Empress Dowager Cixi's Image Making (New Haven: Yale, 2023)
Identification and attenuation of slat noise
Full text linkIn the case of civil transport aircraft, engines were the dominant noise source until the advent of the high-bypass ratio engines in the early 1970s. Since then, airframe noise has become more important, particularly during the approach-to-landing stage of aircraft operations. The main components of airframe noise are the flap side edge, leading edge slat, and the landing gear. Experiments in both the wind tunnel and via fly-over measurements have shown that the slat noise is a major contributor to the overall airframe noise during the landing approach for a commercial aircraft.To achieve the goal of reducing slat noise significantly without adversely affecting the aerodynamic performance of the wing, it is obligatory to improve the understanding of the mechanism of slat noise generation. Experiments and numerical simulations were performed to investigate the phenomena of slat noise. It was found that the slat broadband noise generation is governed by two kinds of mechanism. At a low angle of attack of the wing, the typical circulation region is not formed in the slat cove and the slat noise level is low. As the angle of attack increases to a certain value, vortical structures are intermittently generated due to flow interaction occurring between the shear layer originating from the slat cusp and the flow convected from the stagnation line on the main element. Intense slat noise is produced as the vortical structures approach the slat cove surface. With the angle of attack increasing further, the slat noise becomes weak again. The interaction effect tends to become weaker as the shear layer deviates away from the surface of the main element.Two approaches with the aim of attenuating the slat noise were experimentally and numerically studied. The first approach was to reduce the slat noise using air blown on the suction surface of the slat near its trailing edge. A numerical simulation showed that the slat noise levels over most of the frequencies, especially above a St number of 7, were obviously attenuated. In the second approach, a strip mounted on the pressure surface of the main element model was experimentally proven to be an effective method for reducing the broadband slat noise at an angle of attack of 8 degrees and a freestream velocity of 25 m/s. The position and height of the strip also influenced the level of the reduction.Several tonal noise components appear in the slat noise spectrum at an angle of attack of 4 degrees and a freestream velocity of 25 m/s. The dominant tone is associated with the vortex shedding off the slat cusp through the Kelvin-Helmholtz instability. This tone was successfully suppressed using a plasma actuator employing an open-loop control. A maximum reduction of 11 dB was achieved at a St number of approximately 19.7. A quasi-static feedback control system was also developed, wherein a controller is responsible for calculating the control inputs in terms of feedback signals. The experimental results show that the controller can work effectively to suppress the slat noise
Trachelas sinensis Chen, Peng et Zhao 1995
No full textTrachelas sinensis Chen, Peng et Zhao, 1995 (Figs. 36–41) Trachelas sinensis Chen, Peng & Zhao 1995: 161, f. 1–4; Song, Zhu & Chen 1999: 429, f. 256 A–B, I–J. Diagnosis. Among its close Trachelas relatives in China, this species is very similar to Trachelas japonicus Bösenberg et Strand, 1906, and can be distinguished from the latter only by: (1) bursa club-shaped, while oval in the latter; (2) triangular tibial apophysis from retrolateral view, subrectangular in the latter; (3) wider conductor, nearly trapeziform from ventral view, while relatively narrow, elongate oval in the latter. Redescription. Male. Total body length 3.94–4.23. A male was measured (Mt. Shennongjia), total length 4.23: cephalothorax 1.78 long, 1.53 wide; abdomen 2.45 long, 1.48 wide. Carapace red brown (Fig. 36), ovoid in dorsal view, narrower at anterior margin, highest between fovea and PER; densely covered with minute granulations. Fovea shallow, short and indistinct, located on posterior slope of carapace. Clypeal height 0.12. Eye diameter: AME 0.12, ALE 0.08, PME 0.10, PLE 0.10. Eye interdistance: AME–AME 0.08, AME–ALE 0.04, PME–PME 0.10, PME–PLE 0.10; MOA 0.31 long, anterior width 0.36, posterior width 0.30. Chelicerae dark orange, stout, covered with minute granulations; promargin with three teeth, retromargin with two teeth. Endites longer than wide, convex on lateral margin. Sternum shield-shaped, light brown. Legs brown, without spines and cusps. Leg formula 1423 (Table 9). Abdomen yellow brown, with two pairs of sigilla, posterior part with five light grey chevrons on its dorsal surface. Venter of abdomen light brown. Male palp as illustrated (Figs 37–39). Femur largely concave on the distal part ventrally; patella with long finger-shaped apophysis ventrally and a small distal apophysis dorsally; tibia with a triangular apophysis retrolaterally. Cymbium round at base, long and slender, bent ventrally on distal part and without cymbial furrow. Tegulum rounded at base, enclosing twisted loop of sperm duct from embolus to upper part of tegular apophysis. Embolus broad, curved, flattened and long, originating prolaterally, with broad tip composed of membranous and sclerotic parts; tegular apophysis hook-shaped retrolaterally; conductor large and flat, trapezoid, situated prolaterally distally. Female. Carapace colour, eye arrangement, abdominal colouration as for male. Total body length 4.18– 5.30. A female specimen was measured (Mt. Shennongjia), total length 4.37; cephalothorax 1.89 long, 1.62 wide; abdomen 2.48 long, 1.58 wide. Clypeal height 0.12. Eye diameters: AME 0.12, ALE 0.11, PME 0.10, PLE 0.10. Eye interdistances: AME–AME 0.05, AME–ALE 0.03, PME–PME 0.08, PME–PLE 0.08; MOA 0.28 long, anterior width 0.27, posterior width 0.30. Legs brown, without spines and cusps. Leg formula 1423 (Table 10). Epigynum as illustrated (Figs. 40–41). Copulatory openings concave, longitudinally oval, expanded to an oval atrium on the anteromedian. Bursa club-shaped, situated laterally of copulatory openings; spermathecae small globose, smaller than bursa, situated in the posterior part of epigynum, connecting with the copulatory ducts through thinner and longer ducts; fertilization ducts short, arising from the posterolateral ends of the spermathecae. Material types. Male holotype, 22 October 1991, female ‘allotype’, 26 December 1991, 1 female paratype, 10 April 1991, 1 female paratype, 10 June 1991, all collected from Xincun Tea farmland (alt. 134m), Jiujiang Town, Xiushui County, Jiangxi Province, the specimens were deposited in Biology Department, Hubei University, not examined. Material examined. CHINA: Hubei, Shennongjia Natural Reserve, Muyuping, 2 Ƥ, 13, 24 September 2001, M. S. Zhu and J. X. Zhang leg. (MHBU); Fang County, Cave Guanyin, 9 Ƥ, 53, 26 September 2001, M. S. Zhu and J. Y. Yang leg. (MHBU); Shiyan City, 1 Ƥ, 28 September 2001, J.Y. Yang leg. (MHBU). Guizhou, Daozhen County, Dashahe Natural Reserve, 1 Ƥ, 23 May 2004, Z. S. Zhang leg. (MHBU). Anhui, 1 3, no locality or date, Y. J. Xu leg. (MHBU).Published as part of Zhang, Feng, Fu, Jian-Ying & Zhu, Ming-Sheng, 2009, A review of the genus Trachelas (Araneae: Corinnidae) from China, pp. 40-58 in Zootaxa 2235 on pages 53-57, DOI: 10.5281/zenodo.19041
Weighted Reduced Basis Method for Stochastic Optimal Control Problems with Elliptic PDE Constraint
No full textIn this paper we develop and analyze an efficient computational method for solving stochastic optimal control problems constrained by an elliptic partial differential equation (PDE) with random input data. We first prove both existence and uniqueness of the optimal solution. Regularity of the optimal solution in the stochastic space is studied in view of the analysis of stochastic approximation error. For numerical approximation, we employ a finite element method for the discretization of physical variables, and a stochastic collocation method for the discretization of random variables. In order to alleviate the computational effort, we develop a model order reduction strategy based on a weighted reduced basis method. A global error analysis of the numerical approximation is carried out, and several numerical tests are performed to verify our analysis
A new algorithm for high-dimensional uncertainty quantification based on dimension-adaptive sparse grid approximation and reduced basis methods
No full textIn this work we develop an adaptive and reduced computational algorithm based on dimension-adaptive sparse grid approximation and reduced basis methods for solving high-dimensional uncertainty quantification (UQ) problems. In order to tackle the computational challenge of "curse of dimensionality" commonly faced by these problems, we employ a dimension-adaptive tensor-product algorithm [16] and propose a verified version to enable effective removal of the stagnation phenomenon besides automatically detecting the importance and interaction of different dimensions. To reduce the heavy computational cost of UQ problems modelled by partial differential equations (PDE), we adopt a weighted reduced basis method [7] and develop an adaptive greedy algorithm in combination with the previous verified algorithm for efficient construction of an accurate reduced basis approximation. The efficiency and accuracy of the proposed algorithm are demonstrated by several numerical experiments
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