This research is focused on the study of the physical, chemical, mechanical, and thermal properties of a newly identified natural stem fiber, Cyperus pangorei. The chemical composition of Cyperus pangorei fibers (CPF) such as cellulose, lignin, ash, moisture, and wax contents was evaluated. Besides these, the fiber density was determined and the apparent diameter was measured using an optical microscope. Further, tensile, thermal, XRD, and FT-IR studies were performed to evaluate the suitability of the fiber as a reinforcement. The surface topography of CPF was analyzed using scanning electron microscopy (SEM). Encouraging properties such as increased stiffness, fiber texture, and higher thermal stability suggest the suitability of CPF as reinforcement in polymer matrices.

This paper proposes a structured, integrated decision model for evaluating suppliers by combining the fuzzy analytical hierarchy process (FAHP) and grey relational analysis (GRA). The qualitative and partially-known information is incorporated in this decision model using the fuzzy set theory. In this proposed methodology, the weights of the evaluation criteria are calculated by using FAHP, then the ranking of the suppliers is determined by using GRA. Finally to show the robustness of the model, a sensitivity analysis is also performed. In this study, the supplier selection problem of an electroplating industry in the southern part of India was investigated, demonstrating the effectiveness of this developed integrated model. This model can help in solving the complex decision in supplier selection practice. The results generated from the model are properly validated and finally a systematic solution with decision support is provided for decision makers. This model can be integrated with other decision support systems of similar kinds of industries.

The morphological, physicochemical, mechanical and thermal properties of Veldt-grape stem fibre and wild date palm leaf stalk fibre are described in this work, which are seldom studied before. The botanical name of Veldt-grape stem fibre and wild date palm leaf stalk fibre are known as Cissus quadrangularis and Phoenix reclinata, respectively. The morphological analysis of vegetable fibres showed the presence of cracks, microvoids and impurities on the surfaces of Veldt-grape stem fibre and wild date palm leaf stalk fibre. Veldt-grape stem fibre possessed the lowest diameter and density of approximately 0.2668 mm and 1.2128 g/cm³, respectively, compared to wild date palm leaf stalk fibre. An X-ray diffraction and Fourier transform infrared analysis of Veldt-grape stem fibre and wild date palm leaf stalk fibre exhibited the presence of cellulose I_β with a crystallinity index of 30.9% and 38.8%, respectively. Wild date palm leaf stalk fibre contained high surface roughness in the range of 0.904 µm than Veldt-grape stem fibre (0.611 µm). Tensile tests displayed that wild date palm leaf stalk fibre has highest tensile strength of around 66 MPa, and Veldt-grape stem fibre has highest strain to failure of around 6% in comparison with other fibre. The thermogravimetric analysis indicates that thermal stability of Veldt-grape stem fibre and wild date palm leaf stalk fibre is better up to 230℃ and 250℃, respectively, which are well within the polymerisation process temperature.