19,938 research outputs found
Linking microsimulators of bus stops and traffic operations: the case of PASSION and BusSIGSIM
The aim of this article is to explore the linkage of two microsimulators developed at theUniversity College London. At present, these models deal independently with buses ateither bus stops or traffic networks. First, both microsimulators are described in somedetail. The generic way in which both models can be connected is then proposed. As aresult of this analysis, the main issues for a comprehensive introduction of public transportvehicles (buses) into microscopic traffic simulators are highlighted. One practical outcomeof this study is that the improvement in the representation of buses in microscopic trafficsimulators will allow the engineers to take into account traffic management measures thatotherwise will not be assessed
Study of passenger-bus-traffic interactions on bus stop operations
Buses are the unsung heroes of public transport in modern cities around the world in high,medium and low income countries. However, the bus system is usually cobbled by poordesign which has resulted from poor understanding of how a busThis paper examines theimpacts of the interactions between buses, passengers and traffic on bus operations, especiallyin relation to delays and capacity at bus stops. First, the principles of bus stop operations arepresented. Issues like the stages of bus stop operations, the classification of times spent at busstops, causes of delays, and the interaction between bus flow and stop delays are analysed.This leads to the necessity of microscopic simulation to study stops operations. Then, anillustration of the sort of understanding that can be achieved with a simulation modem isshown. Simulation experiments regarding arrival patterns of buses and passengers, boardingtimes, difficulties for buses to leave the stop, and vehicle capacity are presented. Resultsindicate that it is important not to underestimate the real situation found at bus stops, asdesigning for ideal conditions will be insufficient if the reality is different
Simple one-dimensional quantum-mechanical model for a particle attached to a surface
We present a simple one-dimensional quantum-mechanical model for a particle
attached to a surface. We solve the Schr\"odinger equation in terms of Weber
functions and discuss the behavior of the eigenvalues and eigenfunctions. We
derive the virial theorem and other exact relationships as well as the
asymptotic behaviour of the eigenvalues. We calculate the zero-point energy for
model parameters corresponding to H adsorbed on Pd(100) and also outline the
application of the Rayleigh-Ritz variational method
Developing of the smart textile for energy expenditure monitoring
Peer ReviewedPostprint (published version
Bayesian decision making in human collectives with binary choices
Here we focus on the description of the mechanisms behind the process of
information aggregation and decision making, a basic step to understand
emergent phenomena in society, such as trends, information spreading or the
wisdom of crowds. In many situations, agents choose between discrete options.
We analyze experimental data on binary opinion choices in humans. The data
consists of two separate experiments in which humans answer questions with a
binary response, where one is correct and the other is incorrect. The questions
are answered without and with information on the answers of some previous
participants. We find that a Bayesian approach captures the probability of
choosing one of the answers. The influence of peers is uncorrelated with the
difficulty of the question. The data is inconsistent with Weber's law, which
states that the probability of choosing an option depends on the proportion of
previous answers choosing that option and not on the total number of those
answers. Last, the present Bayesian model fits reasonably well to the data as
compared to some other previously proposed functions although the latter
sometime perform slightly better than the Bayesian model. The asset of the
present model is the simplicity and mechanistic explanation of the behavior.Comment: 8 pages, 6 figures, 1 tabl
The confined hydrogen atom with a moving nucleus
We study the hydrogen atom confined to a spherical box with impenetrable
walls but, unlike earlier pedagogical articles on the subject, we assume that
the nucleus also moves. We obtain the ground-state energy approximately by
means of first--order perturbation theory and by a more accurate variational
approach. We show that it is greater than the one for the case in which the
nucleus is clamped at the center of the box. Present approach resembles the
well-known treatment of the helium atom with clamped nucleus
Is there a prescribed parameter's space for the adiabatic geometric phase?
The Aharonov-Anandan and Berry phases are determined for the cyclic motions
of a non-relativistic charged spinless particle evolving in the superposition
of the fields produced by a Penning trap and a rotating magnetic field.
Discussion about the selection of the parameter's space and the relationship
between the Berry phase and the symmetry of the binding potential is given.Comment: 7 pages, 2 figure
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