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2 Autobusy : technika, eksploatacja, systemy transportowe

2 2010

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Target financing effect on the ecological situation in Latvia

100%

Grishin S. , Schiptsov O.

tom R. 11, nr 6

Ecological problem is a challenge to the mankind. Each country must solve it and serious financial support is required for its solution. This paper contains the statistical data of the ecological problem budgeting and of the harmful substance emission volume in Latvia. Over the period of ten years the dynamics of influence of financing the ecological situation in Latvia has been established. Based on the Latvian ecological statistical data, sample correlation and flexibility coefficients are computed and the regression level is determined. Due to the absence of the data about the transport streams influence, the given statistical data about the ecological situation in Latvia is not complete.

Mathematical model for determination of exhaust concentration dynamics in urban atmosphere under unknown turbulent air flow velocity

71%

Guseynov S. , Kopytov E. , Grishin S. , Schiptsov O. , Rimshans J.

tom R. 11, nr 6

The paper proposes the 3-D nonlinear mathematical model for analytic determination of exhaust concentration dynamics in the city regions under the important stipulation that an airflow velocity is not a priory known. To determine an unknown airflow velocity the nonlinear mathematical model is proposed and this nonlinear model is solved by analytical method. In this model it is provided that the turbulent and molecular diffusion coefficient changes depending on the vertical remoteness above the ground surface. The proposed model can be used for solutions of operative problems on urban traffic organization, of long-term planning of urban agglomeration development and new highway building.