Fluid motions within planetary cores generate magnetic fields through dynamo action. These core processes are driven by thermo-compositional convection subject to the competing influences of rotation, which tends to organize the flow into axial columns, and the Lorentz force, which tends to inhibit the relative movement of the magnetic field and the fluid. It is often argued that these forces a...

Rayleigh damping forces are commonly introduced in the numerical simulations of nonlinear structures run to assess structural performance in case of an earthquake. Their purpose is to account for energy dissipative mechanisms not otherwise explicitly represented in the model. When caused by interactions between the structure and its surrounding environment, energy dissipation is external to the...

0167-9317/$ see front matter 2012 Elsevier B.V. A http://dx.doi.org/10.1016/j.mee.2012.02.022 ⇑ Corresponding author. Tel.: +82 31 219 2488; fax E-mail address: [email protected] (K. Lee). This study proposes a new dual-axis sensing gyroscope based on SAW (surface acoustic wave), in which two substrates are bonded together and completely sealed. The gyroscope on the bottom substrate is used fo...

the ground state rotational bands of some rare earth nuclei show a rather strange behaviour at large values of angular momenta. the nuclear moment of inertia teta increases smoothly with angular momentum i up to i=12. then at about i=14 there is a sudden increase in the moment of inertia. the plot of teta versus the square of the angular velocity w gives a s-shaped curve. we attempt here to rep...

ROBUST OBSERVERS AND CONTROLLERS FOR MARINE SURFACE VESSELSUNDERGOING MANEUVERING AND COURSE-KEEPING TASKS byNASSIM SAADDINE KHALEDAugust 2010Advisor: Prof. Nabil G. ChalhoubMajor: Mechanical EngineeringDegree: Doctor of Philosophy The dynamic behavior of marine surface vessels is highly nonlinear. Moreover, itis significantly influenced by environmental disturba...

This paper discusses a new technique that reproduces a stable cloth without introducing excessive damping artifacts. Semi-implicit integration methods have been widely used in cloth simulations for their high stability and speed. Artificial internal damping forces are derived from the linearization process of semi-implicit integration. This makes the system highly stable. However, the artificia...

Given, in an arbitrary spacetime (M, g), a 2-dimensional timelike submanifold Σ and an observer field n on Σ, we assign gravitational, centrifugal, Coriolis and Euler forces to every particle worldline λ in Σ with respect to n. We prove that centrifugal and Coriolis forces vanish, for all λ in Σ with respect to any n, if and only if Σ is a photon 2-surface, i.e., generated by two families of li...