Prediction of two bladed horizontal axis wind turbine acoustics

Wind power industry has been a growing market and maturing technology for several decades. Increasing wind power generation necessitates closer installation of wind turbines to people and their residences. For that reason, wind turbine noise becomes a serious and controversial phenomenon and it is anticipated to become more stringent issue while wind power generation is increased recently. The aim of this study was to propose a methodology to predict the wind turbine blade noise by using two dimensional blade section flows and noise analysis/simulation and combining the noise sources to evaluate the total blade noise with reasonable accuracy. Within the scope of this work, the purpose was to perform a two dimensional flow and noise simulation for the two bladed NREL Phase VI wind turbine with the aid of a commercially available Computational Fluid Dynamics (CFD) software ANSYS-FLUENT by using User Defined Functions after applying some corrections under certain assumptions. Analysis results were compared with the 12% scaled model of NREL Phase VI wind turbine acoustic noise measurements conducted in In Korea Aerospace Research Institute (KARI) at the low speed wind tunnel. Blade noise of the measurements were compared with the analysis results at different wind speeds of 5.4 m/s, 7.4 m/s, 12.3 m/s, and 13.3 m/s. For the tip region and inboard area of the blade, reasonable agreement was achieved at certain wind speeds. Additionally, the summation of the contribution from the each blade section was used to predict the total noise emission

Evaluation of the SMN and NAIP genes in a family: homozygous deletion of the SMN2 gene in the fetus and outcome of the pregnancy.

PubMed ID: 19397406[No abstract available

TRANSMEMBRANE ACTIVATOR AND CAML INTERACTOR (TACI) HAPLOINSUFFICIENCY IN B-CELL DYSFUNCTION IN A PATIENT WITH SMITH-MAGENIS SYNDROME

WOS: 000380178500015PubMed ID: 2948583

Association of interleukin-1beta and interleukin-1 receptor antagonist gene polymorphisms in Turkish children with atopic asthma

PubMed ID: 18926055Asthma is a complex genetic disease. Genetic and functional characteristics of interleukin (IL)-1 support a role as an asthma locus for the IL-1 family on chromosome 2q12-21. This study was performed to investigate the relationship between polymorphisms of IL-1beta promoter region -511C/T and IL-1 receptor antagonist (IL-1Ra) gene (IL-RN) and bronchial asthma in Turkish children. Children were divided into two groups: (1) bronchial asthma (n = 328) and (2) healthy control (n = 246). Polymerase chain reaction was used to resolve the IL-1beta -511C/T and the IL-1Ra intron 2 polymorphisms. Plasma IgE concentrations were measured by immunoassays, and skin-prick tests were done in children with atopic diseases. The number of genotype CC and C allele in the control groups in IL-1beta -511C/T polymorphisms increased. The number of genotype 1/1 in the asthma groups and genotypes 1/2 and 5/5 and 5 allele in the control groups in IL-1Ra intron 2 gene polymorphism increased. Serum spIgE level increased in the 2/2 genotype in the asthma groups in IL-1Ra intron 2 gene polymorphism. Based on these results, we conclude that there was an association of pediatric asthma with the IL-1beta -511C/T and IL-1Ra intron 2 gene polymorphism. Based on these findings, it has been proposed that IL-1beta -511C/T and IL-Ra intron 2 gene polymorphism are useful markers for prediction of asthma. Copyright © 2008, OceanSide Publications, Inc., U.S.A