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  • Open Access


    Extraction and Characterization of Litopenaeus vannamei’s Shell as Potential Sources of Chitosan Biopolymers

    Che Engku Noramalina Che Engku Chik1, Amyra Suryatie Kamaruzzan1, Ahmad Ideris Abdul Rahim1, Fathurrahman Lananan2,3, Azizah Endut4, Siti Aslamyah5, Nor Azman Kasan1,*

    Journal of Renewable Materials, Vol.11, No.3, pp. 1181-1197, 2023, DOI:10.32604/jrm.2023.022755

    Abstract Chitin is the second most abundant polysaccharide, produced mainly as an industrial waste stream during crustacean processing. Chitin can be derived into chitosan through the deacetylation process. Conversion of shrimp waste into chitosan via the deacetylation process could be considered a practical approach for shell waste remediation. In this study, chitosan’s physicochemical characteristics extracted from two types of Pacific white leg shrimp, L. vannamei’s shell (i.e., rough and smooth), were compared with commercial chitosan. The yield, moisture, ash, solubility, water and fat binding capacity were measured. The degree of deacetylation (DDA) was calculated using FTIR, and their chemical Structure was… More > Graphic Abstract

    Extraction and Characterization of <i>Litopenaeus vannamei</i>’s Shell as Potential Sources of Chitosan Biopolymers

  • Open Access


    Thermodynamics of Molten Pool Predicted by Computational Fluid Dynamics in Selective Laser Melting of Ti6Al4V: Surface Morphology Evolution and Densification Behavior

    Donghua Dai1,2, Dongdong Gu1,2,*, Qing Ge1,2, Chenglong Ma1,2, Xinyu Shi1,2, Han Zhang1,2

    CMES-Computer Modeling in Engineering & Sciences, Vol.124, No.3, pp. 1085-1098, 2020, DOI:10.32604/cmes.2020.010927

    Abstract The three-dimensional physical model of the randomly packed powder material irradiated by the laser beam was established, taking into account the transformation of the material phase, the melt spreading and the interaction of the free surface of the molten pool and the recoiling pressure caused by the material evaporation during the selective laser melting. Influence of the processing parameters on the thermal behavior, the material evaporation, the surface morphology and the densification behavior in the connection region of the molten pool and the substrate was studied. It was shown that the powder material underwent the transformation from the partial melting… More >

  • Open Access


    Reconstruction and Evaluation of 3D Fracture Surface Morphology

    K. Slámečka1, J.Pokluda1, P. Ponížil 2, P. Šandera1

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.1, No.4, pp. 153-160, 2007, DOI:10.3970/icces.2007.001.153

    Abstract In the paper a procedure for evaluation of the fracture surface morphology is described in detail. It consists of the stereophotogrammetrical 3D surface reconstruction followed by the Delaunay triangulation of obtained set of surface points. The potential of the procedure is demonstrated using fracture surfaces generated under combined bending-torsion fatigue loading of specimens made from high-strength low-alloy Cr-Al-Mo steel. Fracture profiles extracted from calculated 3D meshes are characterized by the root mean square roughness and the Hurst exponent. As a main result of the analysis the critical portion of the torsion loading component after which the character of the crack… More >

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