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    <title>Transport Research International Documentation (TRID)</title>
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    <copyright>Copyright © 2026. National Academy of Sciences. All rights reserved.</copyright>
    <docs>http://blogs.law.harvard.edu/tech/rss</docs>
    <managingEditor>tris-trb@nas.edu (Bill McLeod)</managingEditor>
    <webMaster>tris-trb@nas.edu (Bill McLeod)</webMaster>
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      <title>Transport Research International Documentation (TRID)</title>
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      <link>https://trid.trb.org/</link>
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    <item>
      <title>Measuring health of highway network configuration against dynamic Origin-Destination demand network using weighted complex network analysis.</title>
      <link>https://trid.trb.org/View/1601906</link>
      <description><![CDATA[Ideal configuration or layout of highways should resemble the actual demands for the roads represented by Origin-Destination (OD) information. It would be beneficial if existing highways can be evaluated for their configurational fitness against the current demands, and newly planned highways can carefully be designed in terms of their layouts and topologies that would reflect the demands. Analysis techniques used for complex networks in the matured field of network theory can be applied for the highway layout health monitoring against the current OD information. This paper proposes a methodology of measuring the fitness of existing highways by comparing their structural configuration against conceptual OD networks using well-established techniques in network theory for complex networks. In the first phase, this paper conducts an empirical analysis and finds that both structural highway network and OD network follow the "power law" distribution as they are weighted by capacity and traffic volume respectively. It is also found that the power law coefficient of the OD network dynamically changes throughout the day and week. In the second phase, a noble methodology of weighting and measuring the health, of structural highway networks against OD networks by means of comparing their power law coefficients is proposed. It is found that the proposed method is effective at detecting deviations from ideal structural configurations associated with actual demands.]]></description>
      <pubDate>Tue, 21 May 2019 11:06:33 GMT</pubDate>
      <guid>https://trid.trb.org/View/1601906</guid>
    </item>
    <item>
      <title>Limit Analysis of Stability of Twin Shallow Tunnels Considering Surface Settlement</title>
      <link>https://trid.trb.org/View/1510046</link>
      <description><![CDATA[This work conducts the plane-strain stability analysis of unlined dual shallow-buried tunnel roof with considering settlement. By taking account of the nonlinearity of soils, nonlinear analysis with Power-Law failure criterion is conducted to describe the ground deformation around twin tunnels on the basis of the superposition technique. Due to the geomechanical difference between different parts of twin tunnels, analytical expressions of the two different shape curves which describe two different parts of neighborhood tunnels are obtained with the variation calculus, which are verified by numerical modelling. The dimensionless solutions for the stability number of twin tunnels are obtained by virtual work equations and also compared with those calculated by other collapse mechanisms. The stability number is derived to examine the effects of spacing between tunnels on the stability of tunnels. The parameter sensitivity analysis is carried out to explore the scope of failure soil block and the upper bound limit supporting load in twin tunnels.]]></description>
      <pubDate>Mon, 25 Jun 2018 13:49:43 GMT</pubDate>
      <guid>https://trid.trb.org/View/1510046</guid>
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    <item>
      <title>Predictive vehicle ride discomfort model based on in-situ Stevens power law parameters</title>
      <link>https://trid.trb.org/View/1501721</link>
      <description><![CDATA[The current dynamic ride comfort mathematical models do not use Maxwell arrangement of vehicle suspension occurring due to top mount and the discomfort weightings used are based on the shaker table tests which ignore the influence of vehicle dynamics, for example the effect of seat cushion. A refined integrated vehicle-occupant, 10 degrees of freedom model that includes top mounts is developed to estimate the occupant response to given harmonic input. The dynamic responses are combined with experimentally obtained in-situ discomfort indices for a car that incorporates the effects of features such as seat cushion. The Stevens power law parameters are estimated and compared with previous studies; the perception model is then used to predict discomfort index as a function of frequency. The influence of the relative stiffness of the top mount and suspension damping on the resonance frequencies is discussed. The acceleration in wheel hop mode can be ~3 times larger than that when top mount is not included. The influence of resonance frequencies suggests importance of not just using frequency average discomfort index while optimising suspension and seat parameters.]]></description>
      <pubDate>Thu, 22 Mar 2018 12:03:10 GMT</pubDate>
      <guid>https://trid.trb.org/View/1501721</guid>
    </item>
    <item>
      <title>Implementing General Power Law to Interconvert Linear Viscoelastic Functions of Modified Asphalt Binders</title>
      <link>https://trid.trb.org/View/1502172</link>
      <description><![CDATA[Interconversion between the relaxation modulus and creep compliance, which forms a constitutive linear viscoelastic function for asphalt binders, is a classical challenge, even when such a constitutive function is required to be determined at low temperatures based on the bending beam rheometer (BBR) test. Adopting the general power law, a new method was introduced that could precisely fulfill such an interconversion at low temperatures for BBR test data. In order to verify the proposed method, an experimental program was performed on a neat asphalt binder and two modified asphalt binders using crumb rubber and polyphosphoric acid (PPA) individually. Material characteristics were determined from the test data, and they were applied in a numerical framework to simulate BBR test behavior. To ensure the accuracy of using the general power law for interconversion, the results of this approach are compared with well-known approaches introduced by Hopkins and Hamming and Park and Schapery. Numerical results have shown good agreement with the test data.]]></description>
      <pubDate>Thu, 22 Mar 2018 12:03:05 GMT</pubDate>
      <guid>https://trid.trb.org/View/1502172</guid>
    </item>
    <item>
      <title>A study of human mobility behavior dynamics: A perspective of a single vehicle with taxi</title>
      <link>https://trid.trb.org/View/1403486</link>
      <description><![CDATA[In this paper, the authors first research on the distance distribution of human mobility with single vehicle based on the driving data from a taxi company in South China. Different from conventional exponential distribution, the authors discover the mobility distance with taxi follows power-law distribution. Further, they proposed a model which may explain the mechanism for the power-law distribution: mobility distance is constrained by time and fare. Specifically, the relationship between fare and mobility distance follows piecewise function, and responds to individual sensitivity; the relationship between time and mobility distance follows significant logarithmic relationship. These two factors, especially the logarithmic relationship between time and mobility distance, may contribute to a power-law distribution instead of an exponential one. Finally, with a simulation model, the authors verify the significant power-law distribution of human mobility behavioral distance with a single vehicle, by supplementing factors of waiting time and fare.]]></description>
      <pubDate>Thu, 28 Apr 2016 14:42:58 GMT</pubDate>
      <guid>https://trid.trb.org/View/1403486</guid>
    </item>
    <item>
      <title>On the topological properties of urban complex supply chain network of agricultural products in mainland China</title>
      <link>https://trid.trb.org/View/1371524</link>
      <description><![CDATA[Based on the complex network theory, the authors investigated the urban supply chain network of agricultural products in mainland China. Their research shows that the degree distribution of the urban supply chain network of agricultural products in mainland China follows the power-law behavior, and the network has scale-free and high disassortative properties. In this paper, the scaling exponent of the degree distribution of the network is calculated with two methods, the degree correlations of the network are studied, and the assortativity coefficient of the network is calculated. The network displayed high disassortativity in its degree. These properties found in the urban supply chain network of agricultural products in mainland China are very different from other social networks.]]></description>
      <pubDate>Mon, 02 Nov 2015 09:00:28 GMT</pubDate>
      <guid>https://trid.trb.org/View/1371524</guid>
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    <item>
      <title>Multilinear and Nonlinear Power Law Modeling of Motor Vehicle Force-Deflection Response for Uniaxial Front Impacts</title>
      <link>https://trid.trb.org/View/878408</link>
      <description><![CDATA[This research details methods for deriving force-deflection model parameter estimates for frontal collision response in the context of the general multilinear formulation, which subsumes prior bilinear and saturation force models. Furthermore, a nonlinear power law force-deflection model is introduced in conjunction with methods for determining model coefficients from full-width engagement front to rigid barrier collision tests. For both families of models, methods are shown for the separate but coupled evaluation of the loading and unloading phases. The relationship between the force-deflection response and the peak force-crush response for both model families is discussed. Worked examples are shown detailing the practical implementation of the derived analytical models.]]></description>
      <pubDate>Fri, 30 Jan 2009 07:38:39 GMT</pubDate>
      <guid>https://trid.trb.org/View/878408</guid>
    </item>
    <item>
      <title>Rut Accumulation and Power Law Models for Low-Volume Pavements Under Mixed Traffic</title>
      <link>https://trid.trb.org/View/848692</link>
      <description><![CDATA[The fourth-power law has been used for more than 40 years to assist the modeling of the damage that accumulates in pavements due to different traffic load levels and differing numbers of load applications. This paper studies the applicability and the limits of applicability of this law to typical low-volume road pavements with no or only thin seals that obtain their structural performance primarily from the aggregate base (or equivalent) layer and for which pavements’ deterioration is overwhelmingly due to rutting. After behavior of unbound granular pavement materials has been reviewed, data from four sources is used to show that it is sometimes impossible to model real pavement response by any power relationship. Furthermore, power values, even when usable, are highly variable and can vary widely with construction material and with distress criteria. It is shown that, even when a power law is a reasonable way of interpreting data, a value for the law of 4 is not. Some suggestions are given for alternative approaches and adaptations.]]></description>
      <pubDate>Mon, 25 Feb 2008 14:36:50 GMT</pubDate>
      <guid>https://trid.trb.org/View/848692</guid>
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