In 2002, paleolatitude data led researchers from the Ocean Drilling Program to investigate whether the Hawaiian Emperor Bend resulted from a moving hotspot and/or true polar wander as opposed to forming solely as a result of plate movement. In 1963 J. Tuzo Wilson had proposed that the bend was caused by a change in direction of plate movement over the hotspot. With new findings and more extensi...

We demonstrate that high transmission through sharp bends in photonic crystal waveguides can be described by a simple model of the Fano resonance where the waveguide bend plays a role of a specific localized defect.We derive effective discrete equations for two types of the waveguide bends in two-dimensional photonic crystals and obtain exact analytical solutions for the resonant transmission a...

At passage of an ultra-high-energy particle through a bent crystal coherent bremsstrahlung is emitted but with characteristic frequencies distributed continuously, in relation with the crystal bend profile. For practical crystals, such radiation can be calculated by the stationary phase approximation technique. The radiation spectrum averaged over the impact parameters is evaluated. Its charact...

The current effort to make integrated optical chips requires guiding light around sharp corners with a radius of curvature on the order of a wavelength. Light propagates in conventional waveguides as a result of total internal reflection at the interface between the high-refractive index guiding layer and its low-index surroundings. However, bends in the conventional index-contrast waveguides a...

We have developed a powerful parallel genetic algorithm design tool for photonic crystal and waveguide structures. The tool employs a small-population-size genetic algorithm (microgenetic algorithm) for global optimization and a two-dimensional finite-difference time-domain method to rigorously design and optimize the performance of photonic devices. We discuss the implementation and performanc...

Bending of DNA induced by M.Msp I, one of the m5C-DNA methyltransferases, has been investigated using circular permutation analysis. The M.Msp I MTase induced sharp bends in DNA containing its recognition sequence 5'-CCGG-3'which was estimated to be 142+/-4 degrees and 132+/-4 degrees for circularly permuted DNA fragments of 127 and 1459 bp respectively. The bend centre was found to be asymmetr...

A family of large bending dipoles has been successfully magnetically measured, installed and is operational in the high power IR-FEL. These magnets are unique in that they bend the beam 180 degrees on a 1 meter radius. The optics requirements for the magnets include low fields, large horizontal apertures, tight field homogeneity, high repeatability of core field & integrated field, and control ...

Composites using natural fibers are being widely developed and researched, this is because easy to find abundant. In study, the used were bamboo fiber banana stems. Banana has good mechanical properties find, while a low density. aim was determine effect of orientation treatment on tensile strength toughness reinforced composites polyester matrix. The variation 30o 90o, alkali bleaching treatme...