Flexural design of textile-reinforced concrete (TRC) using warp-knitted fabric with improving fiber performance index (FPI)

Bending capacity of textile-reinforced concrete (TRC) is often limited by low penetration of the concrete into inner filaments of fabric rovings. To improve this limitation, we used warp-knitted fabric with different rovings as weft inserted then introduce a fibers performance index (FPI) as sign of the textile reinforcing efficiency. On the base of equilibrium condition models and comparing with experimental data, the FPI is simulated. The influence of different number of rovings and also different layers, on the maximum load, displacement, toughness, and failure modes is discussed. Furthermore, the FPI was improved by partially impregnated fabrics with spotted epoxy. This technique considerably increased FPI from 0.21 for the fabric without epoxy to 0.5 and improved bending properties of TRC.     

碳纤维复合材料在体育器材上的应用

碳纤维及其复合材料不仅在航天航空、汽车及其他工业领域得到广泛应用,而且也是体育器材开发最好的选材之一。介绍碳纤维增强复合材料(CFRP)应用在体育器材方面的优势以及成型工艺。通过典型实例阐述碳纤维这种高新技术材料运用于比赛器械,极大地推动了体育运动成绩的提高。碳纤维及其复合材料已成为发展现代体育器材必不可少的新材料之一。     

Interfacial performance and durability of textile reinforced concrete

The aim of this work is to understand the bonding characteristics between various yarn structures and cement matrix which was studied by yarn pull out test. In this work, the effect of accelerated ageing under alkaline environment for different types of fibers i.e. Basalt, Polypropylene, Polyester, and Jute is studied in order to comparatively evaluate their weight loss and reduction of tensile strength. SEM images are also used for studying the morphology of alkali degraded fibers. Material characterization can also be done by FTIR, XRD, ICP, Zeta potential, and UV spectrometer.     

Determination of Ge(IV) in rice in a mercury-coated glassy carbon electrode in the presence of catechol

Electrochemical adsorptive cathodic stripping voltammetry determination of Ge(IV) using the catechol complex on a mercury-coated (MC) electrode was prepared using a glassy carbon electrode (GCE), the peak potential of which was −0.5 V vs. Ag/AgCl on MCGCE. The various parameters of the catechol concentration, its pH, and others were optimized. The linear working ranges were obtained in the concentration of 2–700 μg L⁻¹ Ge(IV). The relative standard deviation at the Ge(IV) concentration of 50 μg L⁻¹ was 1.37% (n = 15) using the optimum condition, and the detection limit was found to be 0.6 μg L⁻¹ (8.26 × 10⁻⁹ M) (S/N = 3), with an adsorption time of 180 s. The Ge(IV) response was highly linear. This developed method was applied to Ge(IV) to determine the presence of rice grains.     

Açaí (Euterpe oleraceae) ‘BRS Pará’: A tropical fruit source of antioxidant dietary fiber and high antioxidant capacity oil

This article reports a study of the concentrations of dietary fiber (DF) and antioxidant capacity in fruits (pulp and oil) of a new açaí (Euterpe oleraceae) cultivar—‘BRS-Pará’, with a view to determine the possibility of using it as a source of antioxidants in functional foods or dietary supplements. Results show that ‘BRS-Pará’ açaí fruits has a high content of DF (71% dry matter) and oil (20.82%) as well as a high antioxidant capacity in both defatted matter and oil. ‘BRS-Pará’ Açaí fruits can be considered as an excellent source of antioxidant dietary fiber. Antioxidant capacity of açaí ‘BRS-Pará’ oil by DPPH assay was higher (EC₅₀ = 646.3 g/g DPPH) than extra virgin olive oil (EC₅₀ = 2057.27 g/g DPPH). These features provide açaí ‘BRS-Pará’ fruits with considerable potential for nutritional and health applications.