We use 9.5-yr of BiSON Sun-as-a-star data to search for dependence of solar-cycle mode damping changes on the angular degree, l, of the data. The nature of the Sun-asa-star observations is such that for changes measured at fixed frequency, or for changes averaged across the same range in frequency, any l dependence present carries information on the latitudinal distribution of the agent (i.e., ...

The GaAs-based vertical-cavity surface-emitting laser (VCSEL) is the standard light source in today’s optical interconnects, due to its energy efficiency, low cost, and high speed already at low drive currents. The latest commercial VCSELs operate at data rates of up to 28Gb/s, but it is expected that higher speeds will be required in the near future. One important parameter for the speed is th...

We study the neutrino oscillation problem in the framework of the wave packet formalism. The neutrino state is described by a packet located initially in a region S (source) and detected in another region D at a distance R from S. We examine how the oscillation probability as a function of variable R can be derived from he oscillation probability as a function of time t, the latter being found ...

We develop a theory for surface modes at the nematic-isotropic interface in thermotropic nematogen-non-nematogen mixtures. We employ the dynamical generalization of the Landau-de Gennes model for the orientational (nonconserved) order parameter, coupled with the Cahn-Hilliard equation for concentration (conserved parameter), and include hydrodynamic degrees of freedom. The theory uses a general...

Propellant slosh is a potential source of disturbance critical to the stability of space vehicles. The slosh dynamics are typically represented by a mechanical model of a spring mass damper. This mechanical model is then included in the equation of motion of the entire vehicle for Guidance, Navigation and Control analysis. Our previous effort has demonstrated the soundness of a CFD approach in ...

Introduction We propose a new variant of smoothed aggregation (SA) suitable for nonsymmetric linear systems. SA is a highly successful and popular algebraic multigrid method for symmetric positive-definite systems [3, 2]. A relatively large number of significant parallel smoothed aggregation codes have been developed at universities, companies, and laboratories. Many of these codes are quite so...

Effects of uncertainties in gas damping models, geometry and mechanical properties on the dynamics of micro-electro-mechanical systems (MEMS) capacitive switch are studied. A sample of typical capacitive switches has been fabricated and characterized at Purdue University. High-fidelity simulations of gas damping on planar microbeams are developed and verified under relevant conditions. This and...

Heterogeneous oscillator networks consist of a dynamical function that describes the state (containing several parameters) and topology reflects connections between oscillators. Revealing macroscopic dynamics systems under different configurations parameters is topic worthy discussion comes with great challenges. In this study, we discuss effect parameter on damped free vibration classical spri...

We examine surface modes at the nematic-isotropic interface using the generalized dynamical Landau-de Gennes theory. We assume an isothermal, infinite, unbounded nematic-isotropic system characterized by a scalar order parameter, both phases having the same density and viscosity, respectively. The generalized dispersion relation is obtained and analyzed in particular cases. Order parameter rela...

The Viscous Beam is a wearable tremor-suppression orthosis that applies viscous resistance to motion of the wrist in flexion and extension. The orthosis reduces tremor amplitude and is small enough to be worn under the sleeve of a shirt. Hand and forearm cuffs couple the damper to the user. The cuffs permit full thumb and finger motion, wrist flexion and extension, and forearm pronation and sup...