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Acoustic Eigenanalysis with Radial Basis Functions

100%

Majkut L. , Olszewski R.

Acta Physica Polonica A

2014

tom 125

nr 4A

A-77-A-83

The paper concerns the eigenanalysis of acoustic cavities with the use of radial basis functions (RBF). The Kansa collocation method was used for determination of the natural frequencies and eigenvectors of 1D, 2D and 3D acoustic fields. Due to validation analysis of the proposed method, in simple examples like 1D, 2D rectangle and 3D rectangular parallelepiped all calculated eigenferquency and eigenvectors were compared with exact (analytical) results. All results indicate that using of multiquadric radial basis functions provide a results with very high accuracy in comparison to analytical results. In the paper a new method for determining the shape parameter of the multiquadric radial basis functions is described.

Acoustic Field Distortions Caused by Helium-Filled Balloons

80%

Majkut L. , Olszewski R. , Pluta M.

Acta Physica Polonica A

2014

tom 125

nr 4A

A-84-A-87

In this paper, an automated measurement system was proposed that uses a probe hung below a remotely controlled balloon to measure parameters of the acoustic field in the whole volume of a room. The study was conducted to estimate distortions that such system may cause in the acoustic field at the measurement point. The most significant source of the distortions will be the buoyancy element - one large balloon or a number of smaller ones. This paper considers different spatial configurations of spherical balloons with regards to alterations they cause in the acoustic pressure levels measured below them. Interior of a room without and with a group of spherical balloons was modeled using the boundary element method. Using a larger number of smaller spheres instead of a single large one did not significantly reduce the related distortions. However, using two spheres slightly decreased distortions when the distance between the balloons and the recording point was relatively small.

An instrument for measuring the spectral distribution of upward radiance above the sea

80%

Olszewski R. , Darecki M. , Sokolski M.

Oceanological Studies

1995

nr 68/8

15-25

The paper presents a prototype instrument for simultaneous measurements of upweling radiance and downweling irradiance over the sea surface in seven spectral channels.The utility of this instrument in its major applications has been shown.(i) in contactless investigations of sea water components, and (ii) in the calibration and validation of remote sensing data.The paper also presents the technical specifications of the instrument, ita operationg principles and results if field data.

Relationship between microsatellite marker alleles on chromosomes 1-5 originating from the Rhode Island Red and Green-legged Partrigenous breeds and egg production and quality traits in F2 mapping population

61%

Wardecka B. , Olszewski R. , Jaszczak K. , Zieba G. , Pierzchala M. , Wicinska K.

Journal of Applied Genetics

2002

tom 43

nr 3

319-329

The objective of this study was to determine the relationship between the origin of marker alleles from the Rhode Island Red (RIR) and Green-legged Partrigenous (GlP) breeds and chosen egg production and quality traits in F2 generation consisting of 10 full-sib families. Polymorphism analysis of 23 microsatellite markers within the mapping population (519 F2) was made. In parental generation 17 alleles were identified as specific for the GlP and 23 for the RIR. The least squares method was used to evaluate the significance of effects of genotype (GlP/GlP, RIR/RIR, GlP/RIR) on the analysed quantitative traits. Thirty traits of egg production and quality were measured during the laying period. It was shown that the effects of the genotype (GlP/GlP, RIR/RIR, GlP/RIR) at the loci on analysed traits of F2 animals were diversified. Significant effects were found for 16 traits. These results confirm that the analysed microsatellite loci may be linked to the genes affecting egg production and quality traits. The loci examined and the experimental population constitutes a valuable material for QTL mapping (linkage analysis).