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22. Research Progress on Effects of Laser Texture on Tribological Properties of Surface of Materials

Author

SONG Xiaorui, LI Shuangjian, HOU Yuanyuan, BA Zhaowen, ZHENG Hongyu, LIU Mingming

Subjects
laser texture, laser parameters, geometry topography, friction reduction mechanism, Materials of engineering and construction. Mechanics of materials, TA401-492, Technology
Abstract

Laser texture has been widely used in the fields of mechanical production， precision medical treatment， and material surface modification， because of its high precision， high speed， and low environmental pollution.Over the past 30 years， related researches have entered a stage of vigorous development， with the emergence of ultrafast laser texture technology.However， due to the wide variety of geometric topography and various arrangements and combinations，problems such as poor universality of parameter design in different materials still hinder the development of laser textured friction reduction research.Therefore， this work reviewed the development history of laser texture friction reduction researches from the aspects of geometrictopography， dimensional parameters， laser parameters， lubrication conditions， etc.The influences of the laser texture’s geometry topography， parameters and working conditions on the tribological properties were discussed， and the friction reduction mechanism of the laser texture under different lubrication conditions was summarized.Furthermore， the current problems of laser texturing technology were put forward， and its future development direction was prospected.

Published
2023
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27. Analysis of the enhancement of computer simulation on physical education teaching in colleges and universities

Author

Hou Yuanyuan and Ouyang Bo

Subjects
computer simulation, virtual reality technology, human movement modeling, teaching effectiveness, 03b70, Mathematics, QA1-939
Abstract

The integration of computer simulation and modeling into physical education represents a significant shift in teaching methodologies within higher education, prompted by the advancements of the digital era. This study scrutinizes the effectiveness of such technologies in augmenting student learning outcomes and pedagogical efficiency in PE courses. Through the application of virtual reality and precise movement modeling, the research contrasts the impacts of traditional teaching with those of computer-assisted simulations. Findings demonstrate that computer simulation significantly improves students’ physical fitness (by 15%) and skill proficiency (by 20%) and markedly increases their engagement with the subject matter. Additionally, the ability to practice in a simulated, hazard-free environment reduces the time required to master skills. These results support the broad implementation of simulation technologies in physical education, promising enhanced student motivation, skill development, and academic interest.

Published
2024
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34. Effect of Chlorine Dioxide Fumigation on Quality and Browning of Broad Beans

Author

ROUZHAHONG Nuerkaixi, HOU Yuanyuan, ZHAO Yaqin, ZHAO Liyan, ZHENG Yonghua, JIN Peng

Subjects
chlorine dioxide, broad beans, browning, storage and preservation, Food processing and manufacture, TP368-456
Abstract

To study the effect of chlorine dioxide fumigation on the preservation of postharvest broad beans, broad beans were fumigated with different concentrations of ClO2 (0, 15, 30 and 60 μL/L), stored at room temperature and evaluated for color difference, firmness, mass loss percentage, browning index and decay index after 0, 2, 4, 6 and 8 days. The results showed that compared to the control group, ClO2, at all concentrations tested, could inhibit the increase in mass loss percentage, browning index and decay index, and delay the decline in firmness, especially at a concentration of 30 μL/L. Furthermore, 30 μL/L ClO2 fumigation significantly reduced the respiratory intensity, inhibited chlorophyll degradation and malondialdehyde accumulation in broad beans during the 8-day storage period, suppressed the increase in superoxide anion generation rate and the accumulation of hydrogen peroxide, and maintained higher activities of superoxide dismutase (SOD) and catalase (CAT), suggesting that ClO2 fumigation could alleviate oxidative damage to the cell membrane. In addition, ClO2 treatment repressed the activities of polyphenol oxidase (PPO) and peroxidase (POD), maintained the activity of phenylalanine aminolyase (PAL) and the content of total phenols, and delayed the occurrence of browning. Moreover, ClO2 treatment increased the contents of vitamin C, soluble protein and starch, and inhibited the increase of the reducing sugar content in broad beans (P < 0.05), thus maintaining better quality of broad beans. In conclusion, 30 μL/L ClO2 fumigation effectively maintained the edible value of broad beans and improved the storage quality while enhancing the antioxidant capacity.

Published
2023
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