286,966 research outputs found

    A New Look at Translation: Teaching tools for language and literature

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    Does translation have a place in the modern language or literature classroom? This article argues that as long as translation is recognized as a distinct skill rather than a path to language acquisition it can and should play a role in language instruction. The rising popularity of Web-based machine translation (WBMT) sites among students points to a need to help foreign language learners better understand the translation process. Along with a discussion of how instructors can minimize inappropriate use of WBMT, the article provides examples of how translation in the proper context can be used productively to teach both language and literature. It also shows that teachers have much to gain by supporting translation and interpretation as professional options for advanced language learners. Examples are given in Spanish

    Large-scale instabilities in a STOVL upwash fountain

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    The fountain flow created by two underexpanded axisymmetric, turbulent jets impinging on a ground plane was studied through the use of laser-based experimental techniques. Velocity and turbulence data were acquired in the jet and fountain flow regions using laser doppler velocimetry and particle image velocimetry. Profiles of mean and rms velocities along the jet centreline are presented for nozzle pressure ratios of two, three and four. The unsteady nature of the fountain flow was examined and the presence of large-scale coherent structures identified. A spectral analysis of the fountain flow data was performed using the Welch method. The results have relevance to ongoing studies of the fountain flow using large eddy simulation techniques

    Zigzag Decodable Fountain Codes

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    This paper proposes a fountain coding system which has lower space decoding complexity and lower decoding erasure rate than the Raptor coding systems. The main idea of the proposed fountain code is employing shift and exclusive OR to generate the output packets. This technique is known as the zigzag decodable code, which is efficiently decoded by the zigzag decoder. In other words, we propose a fountain code based on the zigzag decodable code in this paper. Moreover, we analyze the overhead for the received packets, decoding erasure rate, decoding complexity, and asymptotic overhead of the proposed fountain code. As the result, we show that the proposed fountain code outperforms the Raptor codes in terms of the overhead and decoding erasure rate. Simulation results show that the proposed fountain coding system outperforms Raptor coding system in terms of the overhead and the space decoding complexity.Comment: 11 pages, 15 figures, submitted to IEICETransactions, Oct. 201

    On turbulent particle fountains

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    We describe new experiments in which particle-laden turbulent fountains with source Froude numbers 20>Fr_{0}>6 are produced when particle-laden fresh water is injected upwards into a reservoir filled with fresh water. We find that the ratio UU of the particle fall speed to the characteristic speed of the fountain determines whether the flow is analogous to a single-phase fountain (U1U\ll 1) or becomes a fully separated flow (U1U\geqslant 1). In the single-phase limit, a fountain with momentum flux MM and buoyancy flux BB oscillates about the mean height, hm=(1.56±0.04)M3/4B1/2h_{m}=(1.56\pm 0.04)M^{3/4}B^{-1/2}, as fluid periodically cascades from the maximum height, ht=hm+Δhh_{t}=h_{m}+{\rm\Delta}h, to the base of the tank. Experimental measurements of the speed uu and radius rr of the fountain at the mean height hmh_{m}, combined with the conservation of buoyancy, suggest that Fr(hm)=u(gr)1/21Fr(h_{m})=u(g^{\prime }r)^{-1/2}\approx 1. Using these values, we find that the classical scaling for the frequency of the oscillations, ωBM1{\it\omega}\sim BM^{-1}, is equivalent to the scaling u(hm)/r(hm)u(h_{m})/r(h_{m}) for a fountain supplied at z=hmz=h_{m} with Fr=1Fr=1 (Burridge &amp; Hunt, J. Fluid Mech., vol. 728, 2013, pp. 91–119). This suggests that the oscillations are controlled in the upper part of the fountain where Fr1Fr\leqslant 1, and that they may be understood in terms of a balance between the upward supply of a growing dense particle cloud, at the height where Fr=1Fr=1, and the downward flow of this cloud. In contrast, in the separated flow regime, we find that particles do not reach the height at which Fr=1Fr=1: instead, they are transported to the level at which the upward speed of the fountain fluid equals their fall speed. The particles then continuously sediment while the particle-free fountain fluid continues to rise slowly above the height of particle fallout, carried by its momentum.</jats:p

    Fountain Codes with Multiplicatively Repeated Non-Binary LDPC Codes

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    We study fountain codes transmitted over the binary-input symmetric-output channel. For channels with small capacity, receivers needs to collects many channel outputs to recover information bits. Since a collected channel output yields a check node in the decoding Tanner graph, the channel with small capacity leads to large decoding complexity. In this paper, we introduce a novel fountain coding scheme with non-binary LDPC codes. The decoding complexity of the proposed fountain code does not depend on the channel. Numerical experiments show that the proposed codes exhibit better performance than conventional fountain codes, especially for small number of information bits.Comment: To appear in Proc. 6th International Symposium on Turbo Codes and Iterative Information Processin

    Q-switched, cavity-dumped, mode-locked laser

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    Continuous-wave laser can achieve higher rate of emission through Q-switching. Technique keeps Q, energy storage rating, of laser cavity at low value while ion population inversion is being built up. Then Q is suddenly switched to high value just before instability occurs

    \u27La Maggior Porcheria Del Mondo\u27: Documents for Ammannati\u27s Neptune Fountain

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    The story of the creation of the Neptune Fountain on the Piazza della Signoria in Florence is long and tortuous. Scholars have drawn on a wealth of documentary material regarding the competition for the commission, the various phases of the fountain\u27s construction, and the critical reception of its colossus, both political and aesthetic. A collection of unpublished letters at the Getty Research Center in Los Angeles offers a new perspective on the making of this major public monument. Sent by Bartolomeo Ammannati to the prvveditore of Pisa, they chronicle the artist\u27s involvement in the procurement and transportation of marble from Carrara and Seravezza for the chariot and basin of the fountain during the years 1565-73. The correspondence, excerpts from which are published here, shows that Ammannati faced numerous delays and mishaps, and continual pressure from his patrons during this second phase of the fountain\u27s construction. The letters provide further insight into the personality of one of the most important artists at the court of Duke Cosimo I, whose role required the skills of a project manager and negotiator. The commission for a grandiose fountain in Florence\u27s main square took much longer to complete than had been expected and taxed the artist\u27s patience, persistence and resourcefulness. [excerpt

    Maya and Nahuatl in the Teaching of Spanish

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