Revealing a Hidden, Stable Spectral Structure of Urban Vehicular Traffic

On the base of experimental data it was revealed that type of wave breaking depends on wave asymmetry against the vertical axis at wave breaking point. The asymmetry of waves is defined by spectral structure of waves: by the ratio between amplitudes of first and second nonlinear harmonics and by phase shift between them. The relative position of nonlinear harmonics is defined by a stage of nonlinear wave transformation and the direction of energy transfer between the first and second harmonics. The value of amplitude of the second nonlinear harmonic in comparing with first harmonic is significantly more in waves, breaking by spilling type, than in waves breaking by plunging type. The waves, breaking by plunging type, have the crest of second harmonic shifted forward to one of the first harmonic, so the waves have "saw-tooth" shape asymmetrical to vertical axis. In the waves, breaking by spilling type, the crests of harmonic coincides and these waves are symmetric against the vertical axis. It was found that limit height of breaking waves in empirical criteria depends on type of wave breaking, spectral peak period and a relation between wave energy of main and second nonlinear wave harmonics. It also depends on surf similarity parameter defining conditions of nonlinear wave transformations above inclined bottom.

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Effectiveness of Containment Strategies to Control Vehicular Traffic on Roads in Dhaka, Bangladesh during COVID-19 Pandemic: Use of Google Map Based Real-Time Traffic Data

SSRN Electronic Journal ◽

10.2139/ssrn.3638853 ◽

2020 ◽

Author(s):

Niaz Mahmud Zafri ◽

Sadia Afroj ◽

Mohammad Ashraf Ali

Keyword(s):

Real Time ◽

Vehicular Traffic ◽

Traffic Data ◽

Real Time Traffic

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Effectively Utilization of Road Divider for Organized Vehicular Traffic using IoT

International Journal of Science and Engineering for Smart Vehicles ◽

10.21742/ijsesv.2018.2.1.01 ◽

2018 ◽

Vol 2 (1) ◽

pp. 1-10 ◽

Cited By ~ 1

Author(s):

Ch. Sekhar ◽

Keyword(s):

Vehicular Traffic

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Thermodynamic Green’s Functions and Spectral Structure

10.1093/oso/9780198791942.003.0007 ◽

2018 ◽

Author(s):

Norman J. Morgenstern Horing

Keyword(s):

Green’S Function ◽

Green's Function ◽

Green's Functions ◽

Green’S Functions ◽

Spectral Weight ◽

Statistical Thermodynamic ◽

Spectral Structure ◽

Imaginary Time ◽

Translational Invariance ◽

The One

Multiparticle thermodynamic Green’s functions, defined in terms of grand canonical ensemble averages of time-ordered products of creation and annihilation operators, are interpreted as tracing the amplitude for time-developing correlated interacting particle motions taking place in the background of a thermal ensemble. Under equilibrium conditions, time-translational invariance permits the one-particle thermal Green’s function to be represented in terms of a single frequency, leading to a Lehmann spectral representation whose frequency poles describe the energy spectrum. This Green’s function has finite values for both t>t′ and t<t′ (unlike retarded Green’s functions), and the two parts G1> and G1< (respectively) obey a simple proportionality relation that facilitates the introduction of a spectral weight function: It is also interpreted in terms of a periodicity/antiperiodicity property of a modified Green’s function in imaginary time capable of a Fourier series representation with imaginary (Matsubara) frequencies. The analytic continuation from imaginary time to real time is discussed, as are related commutator/anticommutator functions, also retarded/advanced Green’s functions, and the spectral weight sum rule is derived. Statistical thermodynamic information is shown to be embedded in physical features of the one- and two-particle thermodynamic Green’s functions.

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Estimating Pedestrian Impact on Coordination of Urban Corridors

Transportation Research Record Journal of the Transportation Research Board ◽

10.1177/0361198119844971 ◽

2019 ◽

Vol 2673 (7) ◽

pp. 265-280 ◽

Cited By ~ 1

Author(s):

Sharmin-E-Shams Chowdhury ◽

Aleksandar Stevanovic ◽

Nikola Mitrovic

Keyword(s):

Cycle Length ◽

Network Performance ◽

Traffic Signals ◽

High Fidelity ◽

Vehicular Traffic ◽

Traffic Demand ◽

Advantages And Disadvantages ◽

Street Traffic ◽

Pedestrian Impact ◽

Signal Operations

Pedestrian walk timings at most U.S. traffic signals are run in concurrence with relevant signal phases for vehicular traffic. This usually means that signal operations coordinated for the major street can be interrupted by a pedestrian call. Such an interruption may in practice last for a few minutes, thus causing increased delays and stops for major traffic flows. An alternative to this design is to increase the cycle length and embed pedestrian timings within the ring-barrier structure of the prevailing coordination plan. Both approaches have advantages and disadvantages. A fresh approach offered by this study is a comprehensive experimental design and holistic performance evaluation perspectives. The study examines the two abovementioned treatments of pedestrian timings for a small corridor of five intersections in Utah. The experiments have been done in a high-fidelity microsimulation environment with the Software-in-the-Loop version of the field controller (Econolite ASC/3). Findings show that either approach works well for very low traffic demands. When the traffic demand increases findings cannot be generalized as they differ for major coordinated movements versus overall network performance. While major-street traffic prefers no interruption of the coordinated operations, the overall network performance is better in the other case. This can be explained by the fact that avoiding interruptions is usually achieved at the expense of longer cycle length, which increases delay for everyone in the network.

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Mobility Strategies for Icy Conditions

Journal of Visual Impairment & Blindness ◽

10.1177/0145482x8407800806 ◽

1984 ◽

Vol 78 (8) ◽

pp. 365-366 ◽

Cited By ~ 1

Author(s):

Richard W. Larson

Keyword(s):

Vehicular Traffic ◽

Mobility Strategies

Techniques involving knee-bending, balancing, establishing a line of travel and using the cane are presented for pedestrian negotiation of sidewalks, street crossings, steps, slopes and other areas when they are likely to be slippery. Special features of ice, packed snow, thawing, and skidding are pointed out, with reference both to the blind traveler and to vehicular traffic.

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