Laboratory experiments were used to explore the influence of spatial focusing and diffraction on the evolution of unsteady, three-dimensional, deep-water wave-packets with a constant-steepness spectrum. The wave-packets were generated by thirteen independently programmed paddles and evolved to breaking near the midpoint of a 4m x 11 m test section. Detailed measurements of surface displacements...

The Baer and Rinzel model of dendritic spines uniformly distributed along a dendritic cable is shown to admit a variety of regular traveling wave solutions including solitary pulses, multiple pulses and periodic waves. We investigate numerically the speed of these waves and their propagation failure as functions of the system parameters by numerical continuation. Multiple pulse waves are shown ...

This note describes an interferometric reformulation of linear wave-based inverse problems, such as inverse source and inverse Born scattering. Instead of fitting data directly, we propose to match cross-correlations and other quadratic data combinations that generalize cross-correlations. This modification exhibits surprising robustness to modeling uncertainties of a kinematic nature. Three op...

A number of emerging dynamic traffic analysis applications, such as regional or statewide traffic assignment, require a theoretically rigorous and computationally efficient model to describe the propagation and dissipation of system congestion with bottleneck capacity constraints. An open-source light-weight dynamic traffic assignment (DTA) package, namely DTALite, has been developed to allow a...

This paper concerns the analysis of the screw theory-based kinematic modeling in order to ease the programming process. To do so, an object-oriented computational framework is developed from this analysis. Screw theory and related tools are well used in motion analysis of open and closed kinematic chains, typical of robotic manipulators, in an uniform and systematic way. Their use in the invers...

The accurate model-based servo-control of wheeled mobile robots (WMRs) relies upon the formulation of realistic kinematic and dynamic models. We* identify six special WMR characteristics (closed-chains, hig her-pair joints, unactuated and unsensed joints, friction, and pulse-width modulation) that require methodologies for modeling and control beyond those conventionally applied to stationary m...

We formulate the kinematic equations-of-motion of wheeled mobile robots incorporating conuentionaI, omnidirectional, and ball wheels. While our approach parallels the kinematic modeling of stationary manipulators, we extend the methodology to accommodate such special characteristics of wheeled mobile robots as multiple closed-link chains, higher-pair contact points between a wheel and a surface...

it is proposed to use a single base platform in the persian gulf considering its low depth and more appropriate environmental conditions in comparison to north sea and mexico gulf where this kind of platform is very popular. the pile of platform is responsible for transmission of environmental loads resulted from waves, currents, wind and dead loads to foundation of platform. using sacs 5.3 sof...

This paper presents the motion planning for the redundant parallel kinematic mechanism using joint torque distribution that satisfies a path of the end-effector. The redundant parallel kinematic mechanism more numbers of actuator than numbers of degrees-of-freedom, and it has the advantage of bigger workspace than non-redundant parallel kinematic mechanism by eliminating singularities. The redu...

We consider a dynamo wave in the solar convective shell for the kinematic αω-dynamo model. The spectrum and eigenfunctions of the corresponding equations are derived analytically with the aid of the WKB method. Our main aim here is to investigate the dynamo wave behavior in the vicinity of the solar poles. Explicit expressions for the incident and reflected waves are obtained. The reflected wav...