Zobrazeno 1 - 10
of 131
pro vyhledávání: '"Leon Poladian"'
Publikováno v:
Systematic Biology. 63:726-742
Molecular phylogenetic studies of homologous sequences of nucleotides often assume that the underlying evolutionary process was globally stationary, reversible, and homogeneous (SRH), and that a model of evolution with one or more site-specific and t
Autor:
Leon Poladian
Publikováno v:
International Journal of Mathematical Education in Science and Technology. 44:865-876
Compulsory mathematics service units for the life sciences present unique challenges: even students who learn some specific skills maintain a negative attitude to mathematics and do not see the relevance of the unit towards their degree. The focus on
Autor:
Richard Lwin, Maryanne C. J. Large, Leon Poladian, Sergio G. Leon-Saval, Jerome Poulin, Alexander Argyros
Publikováno v:
Journal of Lightwave Technology. 30:192-197
We report on a study of the loss mechanisms in microstructured polymer optical fibers (mPOF), resulting in the fabrication of mPOF with a loss equal to that of commercial polymer optical fibers of 0.16 dB/m at 650 nm, nearing the limit imposed by mat
Autor:
J. D. Fitz Gerald, Maryanne C. J. Large, Stephen T. Hyde, Leon Poladian, Holger Averdunk, Shelley F. J. Wickham, Frank Brink, Gerd E. Schröder-Turk
Publikováno v:
Journal of Structural Biology. 174:290-295
The structure of the porous three-dimensional reticulated pattern in the wing scales of the butterfly Callophrys rubi (the Green Hairstreak) is explored in detail, via scanning and transmission electron microscopy. A full 3D tomographic reconstructio
Autor:
Mark Straton, Eun Hee Min, Andrew Docherty, Alexander Argyros, François Ladouceur, Ziyi Ge, Kok Hou Wong, Leon Poladian
Publikováno v:
Frontiers of Optoelectronics in China. 3:67-70
Circular birefringence is a property of chiral materials. In this work, we consider the use of chiral materials in optical fibres to produce circularly birefringent optical fibres and in fibres where a contrast in circular birefringence contributes t
Autor:
Leon Poladian, Alexander Argyros, Raman Kashyap, Maryanne C. J. Large, Andrew Docherty, Jerome Poulin
Publikováno v:
Journal of Lightwave Technology. 27:1610-1616
There has been considerable recent success in fabricating large-core highly multimoded polymer air-clad fibers suspended by thin bridges. These thin bridges are constructed by surrounding a solid core preform by many capillary tubes, the adjacent wal
Autor:
Leon Poladian
Publikováno v:
Natural Computing. 9:263-282
Any crossover operator has both beneficial and detrimental effects: it can bring building blocks together or it can tear them apart. In this paper, we provide evidence that the recombination can be biased towards its more beneficial aspects by modify
Publikováno v:
Optical and Quantum Electronics. 39:1091-1102
Microstructured polymer optical fibres (mPOFs) can be more easily fabricated in unusual geometries than their silica counterparts, allowing a more diverse range of structures to be explored. We have used evolutionary algorithms to explore a variety o
Publikováno v:
Physica B: Condensed Matter. 394:229-232
This paper reviews some examples of structural colour in nature, and examples in which these structures have served as a direct inspiration for technological applications, for example, in display technology or optical security. In other cases, biolog
Publikováno v:
Journal of Lightwave Technology. 25:1177-1183
A uniform transverse temperature profile is crucial for the direct draw of microstructured optical fibers (MOFs). This can be difficult to achieve for preforms made from materials of poor thermal conductivity, such as polymer. In this paper, we have