We examine the effect of photodarkening-induced pump light absorption on Yb-doped fiber thermal loading. In these experiments, the fiber is cladding pumped at 915nm, air cooled by natural convection, and monitored with a midinfrared thermal camera. The fiber temperature is found to correlate with progressive photodarkening. The maximum observed fiber temperature was 120 degrees C, recorded at a pump power of 10.5W. The observed increase in fiber temperature can be explained by a model that takes into account the combined effects of the Yb-silica quantum defect, the temperature dependence of the Yb-absorption cross section, and photodarkening-induced loss at 915nm. We hypothesize that the latter effect results in the progressive activation of temperature-dependent photochemical processes (e.g., bleaching) and is an important consideration with regard to the accurate modeling of Yb-doped fiber photodarkening kinetics.
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http://dx.doi.org/10.1364/AO.49.004139 | DOI Listing |
Poult Sci
January 2025
Institute of Microbiology and Molecular Genetics, University of the Punjab, Lahore, Pakistan. Electronic address:
Escherichia coli (E. coli) is a widely distributed pathogenic bacterium that poses a substantial hazard to poultry, leading to the development of a severe systemic disease known as colibacillosis. Colibacillosis is involved in multimillion-dollar losses to the poultry industry each year worldwide.
View Article and Find Full Text PDFInt J Biol Macromol
January 2025
Tianjin Key Laboratory of Pulp & Paper, Tianjin University of Science and Technology, Tianjin, 300457, PR China; State Key Laboratory of Biobased Fiber Manufacturing Technology, Tianjin University of Science and Technology, Tianjin 300457, PR China. Electronic address:
Poly (lactic acid) (PLA) is a widely produced bio-based polymer known for its biodegradability and renewability, but its brittleness, low heat resistance, and weak mechanical properties limit its broader use. To address these challenges, TEMPO-oxidized cellulose nanofibers (TOCNF) were extracted from dissolving pulp using TEMPO oxidation and high-pressure homogenization. These TOCNF were modified with silane to reduce hydrophilicity and improve compatibility with PLA.
View Article and Find Full Text PDFJ Phys Chem B
January 2025
Department of Engineering Mechanics, KTH Royal Institute of Technology, 100 44 Stockholm, Sweden.
We here explore confinement-induced assembly of whey protein nanofibrils (PNFs) into microscale fibers using microfocused synchrotron X-ray scattering. Solvent evaporation aligns the PNFs into anisotropic fibers, and the process is followed in situ by scattering experiments within a droplet of PNF dispersion. We find an optimal temperature at which the order parameter of the protein fiber is maximized, suggesting that the degree of order results from a balance between the time scales of the forced alignment and the rotational diffusion of the fibrils.
View Article and Find Full Text PDFSci Rep
January 2025
Engineering Research Center of Flexible Radiation Protection Technology, Universities of Shaanxi Province, Xi'an Polytechnic University, Xi'an, 710048, Shaanxi, China.
The impact of light radiation, a predominant energy release mechanism in nuclear explosions, on material properties is of critical importance. This investigation employed an artificial light source to replicate the effects of nuclear explosion radiation and utilized a physical information neural network (PINN) to examine the temperature evolution and corresponding changes in the mechanical properties of carbon fiber/epoxy composites (CFEC). A light source simulating nuclear explosion's light radiation was built to irradiate the CFEC, then measure the reflection spectrum and temperature of samples.
View Article and Find Full Text PDFInt J Biol Macromol
January 2025
College of Food and Bioengineering, Qiqihar University, Qiqihar 161006, PR China; Engineering Research Center of Plant Food Processing Technology, Ministry of Education, Qiqihar 161006, PR China. Electronic address:
This study aimed to establish a microwave-assisted method (MAE) for the efficient extraction of polysaccharides from dandelion roots. This study investigated the molecular structure and bioactivity of the polysaccharides from dandelion roots. Extraction conditions were optimized using response surface methodology (RSM).
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