The experimental results confirm the low dispersion characteristics of porous fibers compared to microwires and a 0.012 birefringence for 0.65 THz is achieved for porous fiber with asymmetrical air-hole shape. Introduction: In recent years there has been increased interest in low loss and low dispersion THz waveguides as potential substitutes for the free-space optics in terahertz spectroscopy ...

The Sudarium of Oviedo has been studied intensively with a petrographic (polarizing) microscope. It is composed of pure flax fibers, and they show the same characteristics as the Shroud of Turin. The technology used to prepare the linen cloth appears to be identical to that described for Roman times by Pliny the Elder (Natural History XIX, 3, 16-18). Flax fibers are mostly crystalline cellulose...

This review brings up to date material on the pulm'J:iary receptors with vagal afferent fibers. The­re a:·e essentially three typs of pulmonary receptors, 1) pulmonary stretch receptors, 2) irritant receptors, 3) type J pulmonary receptors. Their location, natu- 1 al stimulus, excitatory stimulus, reflex effects ancl their responses to chemical substances for three kind of recptas a,e discussed...

An ideal scaffold material is one that closely mimics the natural environment in the tissue-specific extracellular matrix (ECM). Therefore, we have applied hyaluronic acid (HA), which is a main component of the cartilage ECM, to chitosan as a fundamental material for cartilage regeneration. To mimic the structural environment of cartilage ECM, the fundamental structure of a scaffold should be a...

Germanium optical fibers have been fabricated using a high pressure chemical deposition technique to deposit the semiconductor material inside a silica capillary. The amorphous germanium core material has a small percentage of hydrogen that saturates the dangling bonds to reduce absorption loss. Optical transmission measurements were performed to determine the linear losses over a broad mid-inf...

258 is one where the piezoactivity and mechanical properties can be altered individually so that the mechanical stiffness of the material can be controlled for particular applications or tuned to match that of the surroundings (e.g., air or water) for increased transduction sensitivity. Here, we present a new piezoelectric material based on a helical biopolymer with an inherently large electric...

We report about a new type of nonlinear photonic crystal fibers allowing broadband four-wave mixing and supercontinuum generation. The microstructured optical fiber has a structured core consisting of a rod of highly nonlinear glass material inserted in a silica tube. This particular structure enables four wave mixing processes with very large frequency detuning (>135 THz), which permitted the ...