a b s t r a c tVertical axis wind turbines like the Darrieus turbine appear to be promising for the conditions of low wind speed, but suffer from a low efficiency compared to horizontal axis turbines. A fully detailed numerical analysis is introduced in this work to improve the global performance of this wind turbine. A comparison between ANSYS Workbench and Gambit meshing tools for the numerical modeling is performed to summarize a final numerical sequence for the Darrieus rotor performance. Then, this model sequence is applied for different blade airfoils to obtain the best performance. Unsteady simulations performed for different speed ratios and based on URANS turbulent calculations using sliding mesh approach. Results show that the accuracy of ANSYS Workbench meshing is improved by using SST Komega model but it is not recommended for other turbulence models. Moreover, this CFD procedure is used in this paper to assess the turbine performance with different airfoil shapes (25 airfoils). The results introduced new shapes for this turbine with higher efficiency than the regular airfoils by 10%. In addition, blade pitch angle has been studied and the results indicated that the zero pitch angle gives best performance.
The research aims to develop a valid, effective, and practice guidance for laboratory practice of Islamic science-integrated plant anatomy-physiology. The study is development research of Plomp development model. The study consists of five phases, namely the preliminary investigation phase, design phase, realization or construction phase, test, evaluation, and revision phase, and implementation phase. Devices developed were tested to students of Biology Education Department, Universitas Islam Negeri (UIN) Alauddin, Makassar in the Even Semester 2017/2018 Academic Year. The research results indicate that the laboratory practice guidance developed has met valid criteria with content validation average of one practice criteria with device applicability in category three meaning that most of the devices are implemented. Effective criteria with 92% of students who performed the laboratory practice give positive responses to the overall item questioned, and 100% assistants provide positive response on 93.33% items asked.
This article attempts to evaluate emotive meanings across languages and cultures expressed and elicited semiotically from viewers. It investigates the challenges of subtitling emotive feelings in the American film Homeless to Harvard (2003) into Arabic. It adopts Paul Thibault’s (2000. The multimodal transcription of a television advertisement: Theory and practice. In Anthony Baldry (ed.), Multimodality and multimediality in the distance learning age, 311–385. Campobasso: Palladino Editore) method of multimodal transcription and Feng and O’Halloran’s (2013. The multimodal representation of emotion in film: Integrating cognitive and semiotic approaches. Semiotica 197(1/4). 79–100) framework of the multimodal representation of emotion to formulate strategies for subtitling emotion from English into Arabic. Additionally, Feng and O’Halloran’s (2013. The multimodal representation of emotion in film: Integrating cognitive and semiotic approaches. Semiotica 197(1/4). 79–100) framework is adapted to show how stylistic choices (e.g., cinematography, music, soundtracks, etc.) and semiotic expressions can elicit emotion from viewers. The social semiotic model is employed to investigate how emotive representation is realized through verbal and non-verbal items. The findings showed that the filmmakers had properly used stylistic choices and various semiotic techniques to elicit emotion from the viewer derived from the emotion of the film’s heroine.
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