5,498 research outputs found
Optical Peregrine rogue waves of self-induced transparency in a resonant erbium-doped fiber
No full textThe resonant interaction of an optical field with two-level doping ions in a cryogenic
optical fiber is investigated within the framework of nonlinear Schrödinger and Maxwell-Bloch
equations. We present explicit fundamental rational rogue wave solutions in the context of
self-induced transparency for the coupled optical and matter waves. It is exhibited that the
optical wave component always features a typical Peregrine-like structure, while the matter waves
involve more complicated yet spatiotemporally balanced amplitude distribution. The existence
and stability of these rogue waves is then confirmed by numerical simulations, and they are shown
to be excited amid the onset of modulation instability. These solutions can also be extended,
using the same analytical framework, to include higher-order dispersive and nonlinear effects,
highlighting their universality
Some Key Problems Related to Radioactive Ion Beam Physics
No full textThe latest progress made in the field of radioactive ion beam physics is outlined and the key problems still under investigation are indicated. The focal points are the limit of nuclear existence, shell evolution and new magic numbers, halo and cluster structures, new excitation modes, and strong coupling between reaction channels. This field is still at a starting phase and much more new outcomes are foreseen.Physics, Fluids & PlasmasSCI(E)EI中国科学引文数据库(CSCD)0ARTICLE5360-3631
[[alternative]]Lian...dou/ye Construction
No full text[[abstract]]The thesis deals with the ‘lian…dou/ye …’ construction in modern Chinese. In order to clarify the informational status of ‘lian…’, issues on topic and focus are shown in the first part of this thesis. Then, discussions on semantic functions and conversational implicatures of this construction constitute the sencond part. Lastly, the formal complexity and pedagogical instructions will be presented as well.
Roughness Induced Boundary Layer Transition in Incompressible Flow
No full textThe fluid dynamics process leading to laminar-turbulent transition behind an isolated roughness element is investigated in the incompressible regime using particle image velocimetry. The study covers the effect of roughness size and geometry on the promotion of transition. The measurement domain covers a large streamwise range from the near wake to the onset of the turbulent regime. Planar PIV measurements reveal the basic flow pattern and the turbulent structure of the flow characterizing by the velocity fluctuation statistics (RMS of the streamwise and wall-normal velocity component and Reynolds shear stress). The high Reynolds shear stress level reaching the region near the wall in the downstream area indicates the onset of turbulent boundary layer
Children's stories by Ye Shengtao
No full text(in English) In this master's thesis, we will thoroughly examine two significtant fairy tale collections by the Chinese author Ye Shengtao Daocaoren (1923) and Gudai yingxiong de shixiang (1931). Our motivation is to gain a deeper understanding and appreciation of Ye Shengtao's works for children and explore their didactic value. The first part of the thesis deals with the general historical context of children's literature and the genre of fairy tales, the following part deals with the historical and cultural context focused on the field of education in China. Our goal is to explore and understand the views of Chinese intellectuals at the beginning of the 20th century, as well as Western educators, and gain a deeper understanding of Ye Shengtao's pedagogical work and his pedagogical inspirations. In the analytical part, we then determine and examine the main motifs of Ye Shengtao's fairy tales and address the question of how Ye Shengtao uses and transforms literary elements and motifs from Western authors' fairy tales. As a part of the analysis, we will also focus on the structure of the stories in these collections, and we also examine the characteristics of the characters and the environment in order to understand the author's didactic motivations in his realistic portrayal of the fairy tale world
Numerical investigation of energy deposition for supersonic flow over a 2-D diamond-shaped airfoil
No full textThe research models inviscid compressible flow at Mach 2 over a two dimensional diamond-shaped airfoil. The objective is to study the interaction of the energy deposition added in the upstream flow on the airfoil. Theoretical results without energy deposition in the inlet boundary and numerical results with no filaments, infinitely long symmetric filament, symmetric pulsed filament, and asymmetric pulsed filament, for Mach number, temperature, pressure in the flow field domain, are obtained. An analysis is performed on the drag coefficient acting on the airfoil. FLUENT, Gambit, and C++ are used for the numerical simulation.M.S.Includes bibliographical referencesby Ye Zh
Xizicus (Paraxizicus) Liu 2004
No full textSubgenus Xizicus (Paraxizicus) Liu, 2004 Xizicus (Paraxizicus) Liu, 2004. In: Yang, X.K. (Ed.). Insects from Mt. Shiwandashan Area of Guangxi, 100; Liu, Zhou & Bi, 2010. In: Xu, H.C. & Ye, T.X. (Eds.). Insects of Fengyangshan National Nature Reserve, 82. Type species: Xizicus (Paraxizicus) anisocercus Liu, 2004. Subgeneric diagnosis. Body small, medium size for the tribe Meconematini. Body yellowish brown. Dorsal surface of head with 4 longitudinal dark brown stripes. All wings fully developed, tegmina with distinct dark spots; hind wings longer than tegmina. Apices of genicular lobes of hind femora darkish. Posterior margin of male tenth abdominal tergite with a pair of processes; cerci divided into two branches; genitalia with a pair of membranous lobes; subgenital plate elongate, styli positioned in the middle of lateral margins. Ovipositor nearly straight, ventral valve with a small hook at apex.Published as part of Feng, Jiyuan, Chang, Yanlin & Shi, Fuming, 2016, A revision of the subgenus Xizicus (Paraxizicus) Liu, 2004 (Orthoptera: Tettigoniidae: Meconematinae), pp. 570-576 in Zootaxa 4138 (3) on page 571, DOI: 10.11646/zootaxa.4138.3.9, http://zenodo.org/record/27199
Liu wang qu: ge, ge ju.
No full text江陵詞 ; 雪厂曲 ; 集體編劇雪厂, 葉瓊, 江凌.Music in number notation.Jiang Ling ci ; Xuechang qu ; ji ti bian ju Xuechang, Ye Qiong, Jiang Ling
Boundary layer transition induced by distributed roughness array
No full textThe effects of a finite, spanwise-periodic array of cylindrical roughness elements on boundary layer transition over a NACA 0012 airfoil are investigated at a chord-based Reynolds number of 1.44×105 by using hotwire anemometry and infrared thermography. Both the number and the spanwise spacing of roughness elements in the array are varied in order to study their effect on the wake flow topology. Spanwise interaction between the roughness elements has an effect on the connection and the merging of neighbouring low-speed regions, which results in the formation of merged low-speed blobs (MLSs) that modify the spatial distribution and the amplitudes of the velocity streaks. When the spanwise distance between adjacent roughness elements equals 1.5 times the cylinder diameter, the transition location moves rapidly upstream. In this case, the two neighbouring low-speed regions overlap with each other in the near wake of the roughness, leading to the maximum growth in the velocity streak amplitude and the velocity fluctuations. The number of roughness elements affects the total number of MLSs within the boundary layer. For a single MLS behind a pair of cylinders, the Kelvin-Helmholtz instability dominates the growth of velocity fluctuations around the three-dimensional shear layers. When three cylinders are placed in the array, two MLSs appear in the near wake, which coalesce in to one low-speed blob downstream before the onset of transition, revealing the importance of Kelvin-Helmholtz instability.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Wind Energ
Proposed BISOL Facility – a Conceptual Design
No full textIn China, a new large-scale nuclear-science research facility, namely the "Beijing Isotope-Separation-On-Line neutron-rich beam facility (BISOL)", has been proposed and reviewed by the governmental committees. This facility aims at both basic science and application goals, and is based on a double-driver concept. On the basic science side, the radioactive ion beams produced from the ISOL device, driven by a research reactor or by an intense deuteron-beam ac- celerator, will be used to study the new physics and technologies at the limit of the nuclear stability in the medium mass region. On the other side regarding to the applications, the facility will be devoted to the material research asso- ciated with the nuclear energy system, by using typically the intense neutron beams produced from the deuteron-accelerator driver. The initial design will be outlined in this report
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