The transitions between two states of a bistable system are investigated experimentally and analyzed in the framework rare-event statistics. Considering disk pendulum swept by flow wind tunnel, bistability aerodynamic branches is observed, with spontaneous from one branch to other. waiting times before transition distributed following double-exponential as function control parameter, spanning f...

We consider a system of coupled Klein-Gordon equations, which models one-dimensional nonlinear wave processes in two-component media. We find both linear and nonlinear solutions involving the exchange of energy between the different components of the system. The solutions are a continuum generalization of the classical example of energy exchange in Mandelshtam’s system of coupled pendulums. PAC...

A physical pendulum consisting of a circular disk at the end of a thin metal rod is connected to a low-friction rotary motion sensor, so that its angular position and velocity can be accurately measured. The disk can be oriented either perpendicular or parallel to the plane of swing to give significant or negligible air drag, respectively. The motion is analytically modeled in phase space. A qu...

Josephson [8] predicted in 1962 that a DC tunnel current would flow between two superconductors connected by a thin insulating layer of thickness less than about 20 Å in the absence of a voltage difference, an effect now called the DC Josephson effect. The quantum-mechanical current, called the superconducting current, arises from the tunneling of Cooper pairs of electrons of opposite spin and ...

In this paper the UK civil servant directly responsible for managing the action research programme Active Learning for Active Citizenship (ALAC), sets out in brief the policy context within which the programme developed. He explains how concepts of active citizenship and community development were brought together in the early 21st century by the British Government, in a programme of 'civil ren...

A primary limitation on crane operations is the difficulty of controlling payload oscillations. Given the significance of cranes, it is not surprising that a large amount of research has been dedicated to eliminating crane payload oscillation. Numerous feedbackbased control methods have been proposed. Command-shaping is another method that has received significant attention. This paper compares...

In this paper a computational algorithm for nonlinear balanced realization and model reduction based on Taylor series expansion is proposed. This algorithm requires recursive computations with respect to the order of the Taylor series in which we need to solve linear equations with unknown parameters in each step. Furthermore, the proposed method is applied to a double pendulum system. Some num...

(1) Center for Wave Phenomena, Colorado School of Mines, Golden, USA (2) GFZ German Research Centre for Geosciences, Potsdam, Germany (3) Dept. of Earth Sciences, Utrecht University, Utrecht, Netherlands (4) R&D Seismology and Acoustics, Royal Netherlands Meteorological Institute (KNMI), De Bilt, Netherlands (5) NIED National Research Institute for Earth Science and Disaster Prevention, Tsukuba...

The synchronous interaction between a sloshing fluid and its container may take place when the motion of the container is not prescribed a priori. When a partially-filled container is suspended as a bifilar pendulum, the fluid contributes to the restoring force by its weight through the wire suspensions and may either augment or diminish the restoring force through hydrodynamic interaction with...