Extraction, purification, and characterization of polysaccharides from marine algae Gracilaria lemaneiformis with anti-tumor activity

• Published in: Nuclear engineering and design Vol. 338; p. 269
• Main Authors: Shi, Fulin, Yan, Xiaolin, Cheong, Kit-Leong, Liu, Yang
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier BV 01-11-2018
• Subjects: Algae; Anticancer properties; Antitumor agents; Boundary conditions; Harmonic excitation; Modal damping; Nuclear energy; Nuclear engineering; Nuclear fuel elements; Nuclear fuels; Nuclear physics; Nuclear power plants; Nuclear safety; Pellets; Polysaccharides; Purification; Rods; Saccharides; Stiffness; Vibration; Vibration damping; Vibrations; Zirconium; Zirconium base alloys
• ISSN: 0029-5493; 1872-759X

Single zirconium alloy nuclear fuel rods with clamped-clamped boundary conditions and subjected to harmonic excitation at various force levels were experimentally studied. Different configurations were implemented, and the fuel rods were tested in air and submerged in quiescent water. Moreover, the effect of the contained fuel pellets was also reproduced by representative metallic pellets inside the rods. Non-linear stiffness and damping parameters were extracted from experimental vibration response curves by means of a specifically-developed identification tool. For the cases where the fuel pellets were removed or axially compressed, it was found that the axial-symmetry of the fuel rod resulted in a pronounced one-to-one internal resonance. The internal motion of the fuel pellets is a source of friction and impacts during vibrations, thus complicating further the linear and non-linear dynamic behavior of the system. A very significant increase of the viscous modal damping with the vibration amplitude was observed during geometrically non-linear vibrations, which is particularly relevant and in advantage of safety.