Studying waterlogged archaeological wood moisture characteristics can provide strong support for the safe dehydration and preservation of wooden artifacts. Herein, six samples with contents 154%–968% chosen from two ancient Chinese shipwrecks, Nanhai No. 1 Changjiangkou 2, non-degraded modern relevant corresponding species were selected to study by low-temperature nuclear magnetic resonance (NM...

The effect of thermal treatment on the chemical components, equilibrium moisture content (EMC), and shrinkage teak juvenile wood was studied. Heartwood sapwood samples were thermally-treated at 180 ºC 200 ºC. Extractive, Klason lignin, holocellulose, α-cellulose contents, as well pH untreated woods, determined. EMC reached five relative humidity (RH) levels using saturated salt solutions: 86...

The objective of this research was to establish comparatively some relevant features Turkey oak and sessile wood, in order better understand the drying behavior these species. analyzed samples were obtained from freshly harvested trees same age, originating Southern Sub-Carpathians. microscopic analysis revealed that has larger earlywood pores than oak. In heartwood, they are partly filled with...

Using the equations of motion of pulse width and chirp, we present an analytical method for designing dispersion-managed (DM) fiber systems without optical losses. We show that the initial Gaussian pulse considered for the analytical design of periodically amplified DM fiber systems with losses will propagate as a proximity fixed point. Then averaging the DM soliton fields obtained from the slo...

We discuss the efficiency with which coherent plane waves can be coupled to single-mode fibers in the presence of deterministic or stochastic misalignments of the fiber relative to the focal point of a lens. We point out how the alignment demands can be relaxed by means of graded-index-lens fiber-pigtailed collimators.

In this paper, the first- and fourth-order fiber Bragg grating (FBG)-based axial strain sensors are proposed. The FBGs inscribed in step-index polymer optical fibers (POFs) (TOPAS core ZEONEX cladding) via point-by-point (PbP) direct-writing technique. A first-order FBG with a single peak is obtained pulse fluence of 7.16 J/cm2, showing sensitivity 1.17 pm/με. After that, seven peaks 1.81 J/cm2...