Abstract Structural rejuvenation is one of the key topics in the field of metallic glasses (MGs). In this work, we evaluated the combined effects of annealing treatment and elastic cyclic loading to discover pathways for promoting structural rejuvenation and improving the mechanical properties in the MGs. Using molecular dynamics (MD) simulations, it was revealed that the sole cyclic loading led to the increase of rejuvenation degree; however, a saturated state was observed upon the 40th cycle. On the other side, the sample exposed to the combined treatment exhibited a slight relaxation at the first step of cycling process and then a sharp rejuvenation degree was detected in the material. The thorough analyses indicated that the change in the fraction of coordination polyhedrons at the relaxation stage was the main reason for the extra rejuvenation in the sample exposed to the combined treatments. The results also suggest that the combination of rejuvenation treatments improves the magnitude of rejuvenation in the amorphous alloys. It should be noted that the increase of rejuvenation in the alloying systems accompanied with a reduction in the tensile strength and an enhancement in the homogenous plastic deformation.

Abstract Many difficulties relating to food safety have been solved thanks to the employment of strong mass spectrometric detectors in conjunction with liquid chromatography. In this study, samples were fractionated using gel permeation chromatography and liquid/liquid extraction, and liquid chromatography/mass spectrometry (LC/MS) and gas chromatography/mass spectrometry were used to detect possible genotoxicant(s) in recycled paperboard. As a genotoxicity indicator, the rec-assay was utilized. Abietic acid (AA) and dehydroabietic acid (DHA) and were discovered in the recycled paperboard to be genotoxic. AA and DHA were found in 2 of 5 virgin products and all seven recycled food-contact products. AA and DHA total levels in virgin goods were 990 and 240 mg/g, respectively, whereas recycled products had 200990 mg/g. The total quantity of AA and DHA content in DNA-damaging activity and paper products were shown to have a strong connection. Furthermore, genotoxic effects in paper products matched standard chemicals well, showing that AA and DHA were primarily responsible for the genotoxic effects of these paper products.

Abstract Green tea is high in polyphenols - compounds that have a variety of physiological functions. Microwave-assisted extraction (MAE) was used in this study to extract polyphenols from green tea. The MAE of the phenols in green tea was studied using an orthogonal configuration. As a result of UV/vis spectrophotometric methods, the total phenol content of tea infusions was determined. Polyphenols are plant-based chemicals that we acquire from specific foods. They may provide health advantages and are high in antioxidants. Polyphenols are considered to enhance or aid in the treatment of cardiovascular disease, neurodegenerative illness, diabetes, weight management concerns, and digestive problems. Each of the following factors has an impact on extraction: microwave intensity, microwave irradiate time, and frequency of microwave irradiation, as well as the tea/water ratio. Microwave radiation at 600 watts for 3 minutes at a frequency of once produced the best extraction results with a tea/water ratio of 1:20. As compared to traditional methods, MAE has a number of advantages. These include shorter extraction times, energy savings, and reduced environmental impact. A significant source of worry for food suppliers and users is the oxidation of dietary lipids. Antioxidant compounds have been used to prevent the oxidation of lipids. Synthetic antioxidant additions used today include C11H16O2 (BHA), C10H14O2 (TBHQ), and C15H24O (BHT). Toxicological and nutritional concerns, on the other hand, restrict their use. A variety of foods use green tea as a natural preservative because of its powerful antioxidant and antibacterial properties.

Abstract The characterization of strain rate effects near glass transition temperature (Tg) gives important information on flow behavior of metallic glasses (MGs). For this purpose, the tensile strain rate jump test was carried out near glass transition temperature to evaluate the flow behaviors of ZrCoAl(Si) MG ribbons. The primary thermal analyses showed that the Si minor addition into the ZrCoAl alloy leads to the betterment of thermal stability and the glass forming ability (GFA), correlated with the small size of Si atoms and subsequent formation of denser atomic clusters and thermodynamically liquid stabilization in the system. The tensile strain rate jump test indicated that minor adding of Si element decreases the sensitivity of glassy alloy to the flow stress and improves the stability of amorphous structure under increase in the strain rate and applied temperature. It was also observed that the viscosity behavior is more stable with the increase of the strain rate and temperature in the Si-added sample, implying the high capability of viscoplastic response in this state.