Train Velocity
Mostrando 1-12 de 13 artigos, teses e dissertações.
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1. Estimação de velocidade de composições usando processamento de vídeo / Speed estimation.of trains using vídeo processing
This dissertation aims to study a method of estimating the speed of railway vehicles using video processing. The proposed system uses cameras disposed alongside railways to monitor traffic as well as estimate train speeds. Such a system would allow the machinist to have a backup control system, regardless of the control systems already used by the operator o
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 05/08/2011
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2. Recent developments in superstatistics
We provide an overview on superstatistical techniques applied to complex systems with time scale separation. Three examples of recent applications are dealt with in somewhat more detail: the statistics of small-scale velocity differences in Lagrangian turbulence experiments, train delay statistics on the British rail network, and survival statistics of cance
Brazilian Journal of Physics. Publicado em: 2009-08
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3. Decision making strategies for real time trains movement planning / Estrategias de decisão para o planejamento de circulação de trens em tempo real
Railways plays a major role in freight and passenger transportation in the whole world. The Brazilian railway system has suffered a process of abandon and deterioration from 1960 to 1990. Since 1990 the privatization of the national railways brought new investments and in the last years the demand for railway transportation has increased significantly. Railw
Publicado em: 2007
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4. A DYNAMIC INTERACTION MODEL OF TRACK RAILWAY STRUCTURAL ELEMENTS / UM MODELO DE INTERAÇÃO DINÂMICA ENTRE OS ELEMENTOS ESTRUTURAIS DE UMA VIA FÉRREA
In a railway, the vehicle interacts dynamically with a track superstructure (rails, rail pad and sleepers) and sub-structure (ballast, sub-ballast, sub- grade). Passengers comfort, environmental loading (ground vibration) and frequency of maintenance works of vehicles as well as of the track are deter- mined by the way all the structural elements interact. T
Publicado em: 2006
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5. A new robotic drive joint friction compensation mechanism using neural networks
The knowledge of realistic dynamic models to robotic actuators would be of great aid in the synthesis of control laws to robot manipulators, mainly in cases of great precision robotic or even for manipulators with flexible links. In this paper we present a training scheme and propose a structure of neural network (NN) to learn the friction torque of a geared
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2003-04
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6. Bubble-Bubble Interaction in Horizontal Two-Phase Slug Flow
Modelling of the slug structure requires a new effort on fundamental research. To clarify some aspects of the horizontal slug flow, an experimental study of the behaviour of two isolated bubbles in a single-phase liquid flow was performed. This procedure was adopted to avoid the overlap of different phenomena induced by a train of long bubbles. The experimen
Journal of the Brazilian Society of Mechanical Sciences. Publicado em: 2001
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7. Variabilidade interanual de campos atmosféricos totais e zonalmente assimétricos / Interannual variability of total and zonally asymmetric atmospheric fields
Interannual variability of total and zonally asymmetric atmospheric fields is studied through analyses of variances and Empirical Orthogonal Function (EOF) patterns as well as using correlation maps between principal component time series and filtered anomalous time series of some variables for DJF and JJA periods. The period of study spans from 1979 to 1995
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 12/03/1998
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8. Interannual variability of total and zonally asymmetric atmospheric fields / Variabilidade interanual de campos atmosféricos totais e zonalmente assimétricos
Interannual variability of total and zonally asymmetric atmospheric fields is studied through analyses of variances and Empirical Orthogonal Function (EOF) patterns as well as using correlation maps between principal component time series and filtered anomalous time series of some variables for DJF and JJA periods. The period of study spans from 1979 to 1995
Publicado em: 1998
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9. Advances in sedimentation velocity analysis.
On February 20, 1996, a workshop titled "Advances in Sedimentation Velocity Analysis" was held at the Biophysical Society meeting in Baltimore, Maryland, in honor of Professor David Yphantis's 65th birthday. Although he is known more for his work with sedimentation equilibrium, David's work on instrumentation and data analysis is the foundation for many of t
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10. Characterization of concentration- and use-dependent effects of quinidine from conduction delay and declining conduction velocity in canine Purkinje fibers.
The dynamic response of squared conduction velocity, theta 2, to repetitive stimulation in canine Purkinje fibers with quinidine was studied using a double-microelectrode technique. With stimulation, a frequency-dependent monoexponential increase in conduction delay (CD) and a decline in theta 2 were observed. The exponential rates and changes in steady-stat
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11. Neuroeffector characteristics of sweat glands in the human hand activated by regular neural stimuli.
1. Intraneural electrical stimuli (0.3-1.2 mA, 0.2 ms) were delivered via a tungsten microelectrode inserted into a cutaneous fascicle in the median nerve at the wrist in twenty-eight normal subjects. The effects on sweat glands within the innervation zone were monitored as changes of skin resistance and water vapour partial pressure (WVPP). Regional anaesth
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12. Multiarm spirals in a two-dimensional cardiac substrate
A variety of chemical and biological nonlinear excitable media, including heart tissue, can support stable, self-organized waves of activity in a form of rotating single-arm spirals. In particular, heart tissue can support stationary and meandering spirals of electrical excitation, which have been shown to underlie different forms of cardiac arrhythmias. In
National Academy of Sciences.