A comparison of the acoustic and aerodynamic measurements of a model rotor tested in two anechoic wind tunnels

Two aeroacoustic facilities--the CEPRA 19 in France and the DNW in the Netherlands--are compared. The two facilities have unique acoustic characteristics that make them appropriate for acoustic testing of model-scale helicopter rotors. An identical pressure-instrumented model-scale rotor was tested in each facility and acoustic test results are compared with full-scale-rotor test results. Blade surface pressures measured in both tunnels were used to correlated nominal rotor operating conditions in each tunnel, and also used to assess the steadiness of the rotor in each tunnel's flow. In-the-flow rotor acoustic signatures at moderate forward speeds (35-50 m/sec) are presented for each facility and discussed in relation to the differences in tunnel geometries and aeroacoustic characteristics. Both reports are presented in appendices to this paper. ;.)

Modelling and optimisation of the operation of a radiant warmer

This paper presents numerical calculations of the temperature field obtained for the case of a neonate placed under a radiant warmer. The results of the simulations show a very non-uniform temperature distribution on the skin of the neonate, which may cause increased evaporation leading to severe dehydration. For this reason, we propose some modifications on the geometry and operation of the radiant warmer, in order to make the temperature distribution more uniform and prevent the high temperature gradients observed on the surface of the neonate. It is concluded that placing a high conductivity blanket over the neonate and introducing additional screens along the side of the mattress, thus recovering the radiation heat escaping through the side boundaries, helped providing more uniform temperature fields.The European Union for the Marie Curie Fellowship grant awarded to the Centre for CFD, University of Leeds

Post-functionalized iridium Zr-MOF as a promising recycle catalyst for the hydrogenation of aromatics

[EN] The multifunctional heterogeneous catalyst iridium–Zr-based MOF is able to effectively catalyze the hydrogenation of aromatic compounds in high yields under mild conditions. The catalyst was found to be highly active and reusable, giving similar reactivity and selectivity after at least five catalytic uses.We thank the MINECO of Spain (project MAT2011-29020-C02-02), Consolider-Ingenio 2010-(CSD-0050-MULTICAT). for financial support. A.M.R.A. thanks MINECO for the FPI program.Rasero Almansa, AM.; Corma Canós, A.; Iglesias, M.; Sánchez Alonso, F. (2014). Post-functionalized iridium Zr-MOF as a promising recycle catalyst for the hydrogenation of aromatics. Green Chemistry. 16(7):3522-3527. https://doi.org/10.1039/c4gc00581cS3522352716

EFFECT OF WARM-UP INTENSITY ON ATHLETIC PERFORMANCE IN REDUCED TEMPERATURE ENVIRONMENT

M. Corette, S. Sankar, M. Boxwell, C.J. Wutzke Gonzaga University, Spokane, WA A dynamic-warm up is important when exercising in reduced temperature climates. However, little is known about the influence of warm-up intensity on factors such as flexibility or torque production in a reduced temperature environment. PURPOSE: To determine the influence of warm-up intensity on range of motion and torque production in a reduced temperature environment. METHODS: Thirteen young, unimpaired adults completed a dynamic warm-up in an environmental chamber at 3.3 ℃ (48° F). Participants performed two conditions at different warm-up intensities (high: 85% heart-rate max or low: 50% heart-rate max), followed by a 60 second run and five consecutive hamstring curl trials. A seven-unit inertial sensor system was placed on the lower extremity of participants to record knee range of motion (ROM) during the 60 second post-warm-up run. A handheld dynamometer was used to record peak muscle torque while performing maximal hamstring curls. Passive knee ROM was collected with a goniometer at three intervals: Prior to the dynamic warm-up, post dynamic warm-up, and following the 60 second run. RESULTS: No difference was found between hamstring curls at the 50% HR max warm-up (188.60±57.72 Nm) and 85% HR max warm-up (203.08±64.66 Nm) conditions (p=0.168). At the 50% HR max warm-up condition, it was found that torque following the warm-up (112.69 ± 1.81 Nm) was lower than torque prior to warm-up (115.85 ± 1.87 Nm, p=0.012). However, at the 85% HR max warm-up, there was no difference in torque (p=0.712). CONCLUSION: Increased intensity during warm-up resulted in greater passive knee ROM. Therefore, a high intensity warm-up may be beneficial for individuals engaged in exercise in reduced temperature conditions