Search

This study evaluates the mechanical strength of 3D-printed objects of composite material. The composite material considered in this study comprises onyx as the base material with glass fiber and carbon fiber as the internal reinforcements. 3D printing using composite materials generally involves laminating fiber reinforcements in the form of layers within the printed part. To analyze the effect of such reinforcements on the printed parts, specimens were prepared by varying the number of layers and arrangement conditions of the reinforcement. The analysis shows that the tensile strength of the composite increases with the number of reinforcement layers due to the effect of the fibers on the longitudinal direction and a larger bonding area between the internal Onyx and the fibers. Furthermore, higher tensile strength is observed when the reinforcements are laminated at regular intervals than when they are arranged in the center. This study serves as a database for 3D printing fiber-reinforced composites aiding future research in comparing and optimizing their strength according to the 3D printing conditions.

Ho Chi Minh City is considered a safe land of perching birds, where diverse and colorful cultures converge. Experiencing many difficulties throughout history, Ho Chi Minh City has been growing and developing to affirm the country’s leading position. Alongside the city’s economic and social development, the cultural environment has been significantly diversified. For instance, the imprints of families with foreign elements as the result of transnational marriages - have become the trend of the 21st century. The article summarizes, discusses, and analyzes related articles, including theories, regarding the topic: “The Life of families with foreign elements in Ho Chi Minh City” with the literature review approach.

This study investigates safety accidents in physical education classes which account for the largest part of the elementary school safety accidents...

The reporter gene encodes enzymes whose activities are visable by staining with a chromogenic substrate. The reporter gene is developmentally neutral as proved by the normal developmental potential of LacZ positive embryos. In order to clarify the early expression of the myogenin-LacZ gene during mouse embryogenesis, transgenic mice harboring the reporter gene linked to the myogenin flanking region have been developed. Stereoscopic visualization of LacZ expression of these transgenic mouse F1 embryos revealed that the LacZ gene expression in rostral somites appeared to correspond to myogenin which was first detected in mesodermal tissues at high levels at 8.0 days p.c. (post coitum), Which is the furthermore, LacZ expression in the somites and in the limb bud was observed at 10.5 days p.c. and 11.5 days p.c. respectively. At 12.5 days p.c., LacZ gene expression in cells started to migrate to the ventral region of the embryo, where eventually LacZ gene-expressed cells formed the abdominal musculature. This suggested that the role of the myogenin gene is crucial for muscle formation and for myogenic progenitors that migrate from the somite into the developing limb bud. The results also indicated that the myogenin gene is potentially involved in the early stages of muscle determination.