289 research outputs found

    An Examination of Effective lnstructional Strategies for EFL Compositions by Japanese EFL University Students : An Exploratory Study

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    The effectiveness of feedback to improve EFL students' writing skills is the subject of intense debate (Ferris,2004; Truscott,2007).The current study concerns the effectiveness of written feedback in the development of the correct selection of articles. Two groups of students received feedback on their written assignments. The first was a class of nine Japanese EFL students who received grammatical feedback and feedback on content,to weekly essays which had been set for homework. The second group consisted of two students who completed emailed diary entries in English and received feedback from the teacher in the form of replies and not on grammar. Although the feedback concerned general areas of grammar and content,the focus of this study is limited to progress in the correct choice of articles. Neither study demonstrated an improvement in this respect apart from one student in the second group who only received feedback on content. This suggests that unfocused feedback has little influence on the correct choice of articles. Further study could investigate the effectiveness of focused corrective feedback, as has been successfully demonstrated by Ellis at al. (2008),and supplemented with written and oral meta-linguistic explanations, as has been suggested by Bitchener (2008)

    ALMA 1.3 Millimeter Map of the HD 95086 System

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    Planets and minor bodies such as asteroids, Kuiper-belt objects and comets are integral components of a planetary system. Interactions among them leave clues about the formation process of a planetary system. The signature of such interactions is most prominent through observations of its debris disk at millimeter wavelengths where emission is dominated by the population of large grains that stay close to their parent bodies. Here we present ALMA 1.3 mm observations of HD 95086, a young early-type star that hosts a directly imaged giant planet b and a massive debris disk with both asteroid- and Kuiper-belt analogs. The location of the Kuiper-belt analog is resolved for the first time. The system can be depicted as a broad (ΔR/R\Delta R/R \sim0.84), inclined (30\arcdeg±\pm3\arcdeg) ring with millimeter emission peaked at 200±\pm6 au from the star. The 1.3 mm disk emission is consistent with a broad disk with sharp boundaries from 106±\pm6 to 320±\pm20 au with a surface density distribution described by a power law with an index of --0.5±\pm0.2. Our deep ALMA map also reveals a bright source located near the edge of the ring, whose brightness at 1.3 mm and potential spectral energy distribution are consistent with it being a luminous star-forming galaxy at high redshift. We set constraints on the orbital properties of planet b assuming co-planarity with the observed disk.Comment: accepted for publication in A

    A Constraint-Based Approach to Visual Speech for a Mexican-Spanish Talking Head

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    A common approach to produce visual speech is to interpolate the parameters describing a sequence of mouth shapes, known as visemes, where a viseme corresponds to a phoneme in an utterance. The interpolation process must consider the issue of context-dependent shape, or coarticulation, in order to produce realistic-looking speech. We describe an approach to such pose-based interpolation that deals with coarticulation using a constraint-based technique. This is demonstrated using a Mexican-Spanish talking head, which can vary its speed of talking and produce coarticulation effects

    High Temperature, Wireless Seismometer Sensor for Venus

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    Space agency mission plans state the need to measure the seismic activity on Venus. Because of the high temperature on Venus (462? C average surface temperature) and the difficulty in placing and wiring multiple sensors using robots, a high temperature, wireless sensor using a wide bandgap semiconductor is an attractive option. This paper presents the description and proof of concept measurements of a high temperature, wireless seismometer sensor for Venus. A variation in inductance of a coil caused by the movement of an aluminum probe held in the coil and attached to a balanced leaf-spring seismometer causes a variation of 700 Hz in the transmitted signal from the oscillator/sensor system at 426? C. This result indicates that the concept may be used on Venus
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