The role played by di erent core processes in the changes in the Earth's rotation is assessed and fully dynamical models of the torsional Alfvén waves inside the uid core are reviewed. These waves, rst studied by Braginsky (1970), consist of geostrophic circulation. They have decadal periods and yield time changes in core angular momentum. They arise from small departures from an hypothetical q...

Increasing deployment of digital subscriber line (DSL) technology operating in the long wave, medium wave and sometimes short wave frequency ranges, has raised the question of how such systems interact with rival radio frequency sources and equipment. Two of the major standards bodies in the field, ITU and ETSI, imposed by the standardization of such promising technologies like ADSL, SHDSL and ...

E. M. C. Abreu, S. A. Diniz, C. Pinheiro and F. C. Khanna Departamento de F́ısica, Universidade Federal Rural do Rio de Janeiro BR 465-07, 23851-180, Seropédica, Rio de Janeiro, Brazil E-mail: [email protected] and [email protected] Centro de Ciências Exatas, Universidade Federal do Esṕırito Santo, Av. Fernando Ferrari s/n, Campus da Goiabeiras 29060-900 Vitória ES – Brazil E-mail: din...

This paper gives an analysis of noncontact monitoring of thoracic activity by electromagnetic coupling between a sensor coil and thoracic tissue (sometimes called Magnetic induction monitoring). In this context, thoracic activity comprises respiratory and cardiac activity as well as further body motion. The physical principle of the measurement technique is described and several wearable and st...

A manifestly gauge invariant formulation of the coupling of the Maxwell theory with an Einstein Cartan geometry is given, where the space time torsion originates from a massless Kalb-Ramond field augmented by suitable U(1) Chern Simons terms. We focus on the situation where the torsion violates parity, and relate it to earlier proposals for gravitational parity violation. Electronic address: pa...

Charges are often called the coupling constants because their strength determines the coupling, or interaction, strength with the corresponding fields. As we shall see shortly in greater detail, there is a striking symmetry between electric and magnetic fields in our description of electromagnetism. That is, the equations governing the dynamics of the electric and magnetic fields are unchanged ...

A simulation technique based on electromagnetic topology EMT theory is proposed for analyzing electromagnetic interference EMI coupling through apertures onto the two-transmission line enclosed within metallic structures. The electromagnetic interactions between apertures and the external-internal interactions were treated through the topological decomposition and the multistep iterative method...

An important issue in antenna array design is reduction of mutual coupling. In microstrip antennas this reduction can be achieved by using electromagnetic band-gap (EBG) structures. These structures prevent the propagation of surface waves on the substrate of a microstrip antenna array. This paper presents a new configuration of a planar compact electromagnetic bandgap structure to reduce mutua...

We present a formulation of electromagnetic spin-orbit coupling in magneto-optic media, and propose an alternative source of spin-orbit coupling to non-paraxial optics vortices. Our treatment puts forth a formulation of nonreciprocal transverse-spin angular-momentum-density shifts for evanescent waves in magneto-optic waveguide media. It shows that magnetization-induced electromagnetic spin-orb...