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Tatiana Petrova
Faculty of Physics, Lomonosov Moscow State University, Leninskiye Gory, 1, 199991 Moscow, Russia

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Journal article
Published: 09 September 2020 in Sustainability
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The integral indexes are used to measure trends and monitor progress in transportation complex development. The selection of the indicators, included in indexes, is related to the data availability (depends on existence of a specific data sources). The aim of this paper is to provide a development methodology of Integral Index of Traffic Planning (Integral TP Index), which is based on the primary data on vehicle speeds, traffic volumes, number of accidents, etc., for Moscow and allows for basic assessment of transport situation in Russian’s capital. The proposed methodology is a combination of economic and urban approaches to analyze the key indicators of transportation planning efficiency in the metropolis. Four groups of indicators are considered: traffic management efficiency, traffic management quality, transit efficiency and road safety. The integral index considers traffic volumes for various roads and their contributions to the overall transportation system. Division of streets by type (highways, rings, center) makes it possible to take into account specifications the radial-ring streets structure of Moscow. The constructed index is applied to the analysis of Moscow transportation statistics in 2012–2017 provided by the Moscow Traffic Management Center, Yandex and TomTom.

ACS Style

Tatiana Petrova; Andrey Grunin; Arthur Shakhbazyan. Integral Index of Traffic Planning: Case-Study of Moscow City’s Transportation System. Sustainability 2020, 12, 7395 .

AMA Style

Tatiana Petrova, Andrey Grunin, Arthur Shakhbazyan. Integral Index of Traffic Planning: Case-Study of Moscow City’s Transportation System. Sustainability. 2020; 12 (18):7395.

Chicago/Turabian Style

Tatiana Petrova; Andrey Grunin; Arthur Shakhbazyan. 2020. "Integral Index of Traffic Planning: Case-Study of Moscow City’s Transportation System." Sustainability 12, no. 18: 7395.

Preprint
Published: 24 June 2020
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Real-time estimation of the parameters characterising infectious disease transmission is important for optimization quarantine interventions during outbreaks. One of the most significant parameters is the effective reproduction number - number of secondary cases produced by a single infection. The current study presents an approach for estimating the effective reproduction number and its application to COVID-19 outbreak. The method is based on fitting SIR epidemic model to observation data in a sliding time window and allows to show real-time dynamics of reproduction number at any phase of epidemic for countries globally. Online data on COVID-19 daily cases of infections, recoveries, deaths are used.Finally, time-dependent reproduction number is explored in connection with dynamics of peoples mobility. The method allows to assess the disease transmission potential and understand the effect of interventions on epidemics spread. It also can be easily adapted to future outbreaks of different pathogens. The tool is available online as Python code from the Github repository.

ACS Style

Tatiana Petrova; Dmitry Soshnikov; Andrey Grunin. Estimation of Time-Dependent Reproduction Number for Global COVID-19 Outbreak. 2020, 1 .

AMA Style

Tatiana Petrova, Dmitry Soshnikov, Andrey Grunin. Estimation of Time-Dependent Reproduction Number for Global COVID-19 Outbreak. . 2020; ():1.

Chicago/Turabian Style

Tatiana Petrova; Dmitry Soshnikov; Andrey Grunin. 2020. "Estimation of Time-Dependent Reproduction Number for Global COVID-19 Outbreak." , no. : 1.

Journal article
Published: 20 August 2016 in Computation
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An extremely interesting problem in aero-hydrodynamics is the sound radiation of a single vortical structure. Currently, this type of problem is mainly considered for an incompressible medium. In this paper a method was developed to take into account the viscosity and thermal conductivity of gas. The acoustic radiation frequency of a cylindrical vortex on a flat wall in viscous heat-conducting gas (air) has been investigated. The problem is solved on the basis of the Navier–Stokes equations using the small initial vorticity approach. The power expansion of unknown functions in a series with a small parameter (vorticity) is used. It is shown that there are high-frequency oscillations modulated by a low-frequency signal. The value of the high frequency remains constant for a long period of time. Thus the high frequency can be considered a natural frequency of the vortex radiation. The value of the natural frequency depends only on the initial radius of the cylindrical vortex, and does not depend on the intensity of the initial vorticity. As expected from physical considerations, the natural frequency decreases exponentially as the initial radius of the cylinder increases. Furthermore, the natural frequency differs from that of the oscillations inside the initial cylinder and in the outer domain. The results of the paper may be of interest for aeroacoustics and tornado modeling.

ACS Style

Tatiana Petrova; Fedor Shugaev. Calculation of the Acoustic Spectrum of a Cylindrical Vortex in Viscous Heat-Conducting Gas Based on the Navier–Stokes Equations. Computation 2016, 4, 32 .

AMA Style

Tatiana Petrova, Fedor Shugaev. Calculation of the Acoustic Spectrum of a Cylindrical Vortex in Viscous Heat-Conducting Gas Based on the Navier–Stokes Equations. Computation. 2016; 4 (3):32.

Chicago/Turabian Style

Tatiana Petrova; Fedor Shugaev. 2016. "Calculation of the Acoustic Spectrum of a Cylindrical Vortex in Viscous Heat-Conducting Gas Based on the Navier–Stokes Equations." Computation 4, no. 3: 32.