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Modeling of acoustic field for a parametric focusing source using the spheroidal beam equation

100%

Yu L. , Li J. , Shi C.

nr Special Issue S1

A theoretical model of acoustic field for a parametric focusing source on concave spherical surface is proposed. In this model, the source boundary conditions of the Spheroidal Beam Equation (SBE) for difference frequency wave excitation were studied. Propagation curves and beam patterns for difference frequency component of the acoustic field are compared with those obtained for Khokhlov-Zabolotskaya-Kuznetsov (KZK) model. The results demonstrate that the focused parametric model of SBE is good valid for a large aperture angle in the strongly focused acoustic field. It is also investigated that high directivity and good focal ability with the decreasing of downshift ratio and the increasing of half-aperture angle for the focused parametric model of SBE

Quantification of Chaetomium globosum spores in house dust samples

100%

Shi C. , Provost N. B. , Desroches T. , Miller J. D.

nr 3

Study on integration of VTS simulator into net system of ship-handling simulators

100%

Zhang Y. , Ma J. , Shi C. , Hu Q.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

2007

tom Vol. 1, no. 4

381--385

VTS Simulator Training has been a part of VTS operator training program according to IMO/IALA documents. It is a developing direction of VTS simulator to offering a more real-like simulative training as in actual practices. This paper proposed an approach to integrate VTS simulator with Internet system of multiple ship-handling simulators. Utilizing Agent/MAS technology, VTS simulators will play the role of VTS in participating in the interactive simulated training based on Internet. It facilitates a real environment in the VTS training and thus entails better effects.