Evaluation of the Performance of Vortex Generators on the DU 91-W2-250 Profile using Stereoscopic PIV

Stereoscopic PIV measurements investigating the effect of Vortex Generators on the lift force near stall and on glide ratio at best aerodynamic performance have been carried out in the LM Glasfiber wind tunnel on a DU 91-W2-250 profile. Measurements at two Reynolds numbers were analyzed; Re=0.9·10 6 and 2.4·10 6 . The results show that one can resolve the longitudinal vortex structures generated by the devices and that mixing is created close to the wall, transferring high momentum fluid into the near wall region. It is also seen that the vortex generators successfully can obstruct separation near stall

TOPFARM wind farm optimization tool

A wind farm optimization framework is presented in detail and demonstrated on two test cases: 1) Middelgrunden and 2) Stags Holt/Coldham. A detailed flow model describing the instationary flow within a wind farm is used together with an aeroelastic model to determine production and fatigue loading of wind farm wind turbines. Based on generic load cases, the wind farm production and fatigue evaluations are subsequently condensed in a large pre-calculated database for rapid calculation of lifetime equivalent loads and energy production in the optimization loop.. The objective function defining the optimization problem includes elements as energy production, turbine degradation, operation and maintenance costs, electrical grid costs and foundation costs. The objective function is optimized using a dedicated multi fidelity approach with the locations of individual turbines in the wind farm spanning the design space. . The results are over all satisfying and are giving some interesting insights on the pros and cons of the design choices. They show in particular that the inclusion of the fatigue loads costs give rise to some additional details in comparison with pure power based optimization. The Middelgrunden test case resulted in an improvement of the financial balance of 2.1 M€ originating from a very large increase in the energy production value of 9.3 M€ mainly counterbalanced by increased electrical grid costs. The Stags Holt/Coldham test case resulted in an improvement of the financial balance of 3.1 M€

Speech Technology to Support Phonics Learning for Kindergarten Children at Risk of Dyslexia

We present the AiRO learning environment for kindergarten children at risk of developing dyslexia. The AiRO frontend, easy to use for pupils down to 5 years old, introduces each spelling task with pictural and auditive cues. AiRO responds to spelling attempts with phonetic renderings (synthetic voice). Below, we introduce the didactic and technical principles behind AiRO before presenting our first experiment with 50 kindergarten pupils. Our subjects were pre- and post-tested on reading an spelling. After four weeks of AiRObased training the experimental group significantly out-performed the control group, suggesting that a new CALLbased pedagogical approach to prevent dyslexia for some children may be within reach

Adverse effects from counterfeit and mislabeled medicine containing tapentadol and carisoprodol

When self-administration with counterfeit or mislabeled medicine is suspected, comprehensive laboratory analysis should be preferred over immunoassay screening to avoid false negative results. Carisoprodol, which was formerly a popular muscle relaxant drug in many countries, has reappeared on illegal drug markets, and may cause an itching, purple-colored rash, even after a single dose.</p