the oil-paper insulation is a type of an inexpensive combination insulation system in oil-filled power transformers. in this study the dielectric and strength properties of canola oil and mineral oil impregnated hand-sheet papers were investigated. all hand sheets were made of unbleached bagasse soda pulp with two different freeness levels of 200 ± 25 ml, csf and 400± 25 ml,csf. after drying th...

We discuss the constraints that recent observations place on circular polarisation in AGN. In many sources the circular polarisation is variable on short timescales, indicating that it originates in compact regions of the sources. The best prospects for gleaning further information about circular polarisation are high resolution VLBI and scintillation ‘imaging’ which probe source structure on m...

Synthetic Aperture Radar (SAR) and optical images contain different types of land cover information. Moreover, whereas like-polarisation SAR images are predominately influenced by surface backscattering properties, the volume backscattering characteristics of surfaces are well represented by SAR cross-polarisation data. Hence, combined use of likeand cross-polarisation data could enhance the la...

D J Ives, National Physical Laboratory UK. ([email protected]) Abstract Many of the sources used in optical fibre systems are highly polarised and thus for highly accurate power measurements the polarisation dependent response (PDR) of the power meter becomes an important parameter. The use of Optical Spectrum Analysers (OSA) to test components and measure the relative powers in WDM systems ...

Two fundamental laser physics phenomena--dissipative soliton and polarisation of light are recently merged to the concept of vector dissipative soliton (VDS), viz. train of short pulses with specific state of polarisation (SOP) and shape defined by an interplay between anisotropy, gain/loss, dispersion, and nonlinearity. Emergence of VDSs is both of the fundamental scientific interest and is al...

Accurate determination of the specific absorption rate (SAR) is an important aspect in understanding the interaction between electromagnetic fields (EMF) and living matter. Influences due to dielectric properties, shape, and size of the exposed tissues have been considered to play an important role in the determination of SAR distributions in anatomical rat models [1-2]. Direction and polarisat...

A key aspect of animal development is the appropriate polarisation of different cell types in the right place at the right time. Such polarisation is often precisely coordinated relative to the axes of a tissue or organ, but the mechanisms underlying this coordination are still poorly understood. Nevertheless, genetic analysis of animal development has revealed some of the pathways involved. Fo...

We address the intrinsic polarisation and screening of external electric field in a broad range ordered twisted configurations multilayer graphene, using an ab initio approach combining density functional theory Wannier function formalism. show that graphene is intrinsically polarized due to crystal effect, effect often neglected tight-binding models bilayer similar systems. This polarization o...

A Monte Carlo light scattering code incorporating aligned non-spherical particles is described. The major effects on the flux distribution, linear polarisation and circular polarisation are presented, with emphasis on the application to Young Stellar Objects (YSOs). The need for models with non-spherical particles in order to successfully model polarisation data is reviewed. The ability of this...

High-spectral resolution polarisation measurements of the clear daylight sky reveal an unexpected rich spectral fine-structure in the polarisation superimposed on the more familiar broad-band continuum. This polarisation spectrum shows the spectral fingerprints of scattering and absorption processes which is illustrated with radiative transfer calculations. In particular, radiative transfer cal...