Naresuan University Journal
Not a member yet
39887 research outputs found
Sort by
Effect of Urea-to-Fatty Acid Ratio and Crystallization Temperature on the Fatty Acid Composition of Rice Bran Oil Concentrate by Urea Complexation
No full text Processes for the production of polyunsaturated fatty acid (PUFA)concentrates have important because of the beneficial properties of these substances to human health and in functional foods. This study investigated the changes in different urea-to-fatty acid (U/FA) ratios (1:1, 2:1 and 3:1, w/w) and crystallization temperatures (-10, 0 and 10oC) on the fatty acid composition of rice bran oil concentrate, compared with native rice bran oil (control). Overall, the amount of PUFA in the rice bran oil concentrate increased as U/FA ratios increased and crystallization temperature decreased, while saturated fatty acids (SFA) and monounsaturated fatty acids (MUFA) decreased. The results showed that the U/FA ratio at 3:1 had the highest PUFA (56%) among complexation treatments. The higher PUFA concentrations in low-temperature crystallization were obtained at -10oC, with PUFA rising to 60.6%.
Keywords: Polyunsaturated fatty acids, Rice bran oil concentrate, Urea inclusion, Crystallization temperatur
Determinants of Thai Individuals Behavioral Intention towards Online Fitness Program on YouTube during COVID-19 Pandemic
Full text link The purpose of this research is to investigate the determinants of Thai individuals behavioral intention towards online fitness program on YouTube during COVID-19 pandemic situation. The conceptual framework is presented on how effort expectancy, performance expectancy, social influence, attitude, desire, personal innovativeness influence behavioral intention of Thai individuals. The samples of 500 respondents were collected from online and offline questionnaires by using multi-stage sampling technique. Stratified random sampling was used to group users in three age generation and purposive sampling and convenience sampling to reach target respondents. The study applied the Structural Equation Model (SEM) and Confirmatory Factor Analysis (CFA) to analyze the data and confirm goodness-of-fit of the model and hypotheses. The results of goodness-of-fit indicated the model is consistent with empirical data and hypothesis testing results indicated that effort expectancy, performance expectancy, social influence, attitude, desire, and personal innovativeness have a significant influence on behavioral intention. The researcher also found that social influence, effort expectancy and performance expectancy showed significant impact on attitude as mediator of desire which also greatly influences behavioral intention. Behavioral intention of online fitness program on YouTube users is determined by effort expectancy, performance expectancy, social influence, attitude, desire, and personal innovativeness. Hence, fitness YouTube channel owners are recommended to apply these instruments to enhance behavioral innovation when using online fitness program on YouTube.
Keywords: Behavioral Intention, Online Fitness, YouTube, COVID-19, Thai Individual
School Management Strategies to Improve the Career Skills in a Multicultural Society
No full text The objectives of this research were: 1) to investigate the priority needs and factors contributing to improving the career skills in a multicultural society, 2) to construct and verify school management strategies to improve the career skills in a multicultural society, and 3) to study the results of the implementation of school management strategies to improve the career skills in a multicultural society. Instruments used in this research were an AIC technique and a meeting record form. Data were analyzed by content analysis and summarizing. The results revealed as follows: 1) Results of investigating the priority needs consisted of education, career skills, economy, and environment, 2) Results of factors contributing to improve the career skills in a multicultural society consisted of budgets, workplace, resource persons, technology or innovation, management, and sustainability, 3) Results of construction school management strategies consisted of education, career skills, management, and sustainability, 4) Results of verification strategies were the cooperative selection and prioritization the projects, and 5) Results of implementation the school management strategies to improve the career skills in a multicultural society, the stakeholders were very satisfactions.
Keywords: Management, Strategies, Career, Skills, Multicultura
Distribution and Microplastic Pollution and Its Associated Heavy Metal Contamination from an Urban Canal: A Case Study of Saen Saeb Canal, Thailand
No full text Microplastics are emerging as a widespread environmental contaminant in all ecological systems, including the aquatic environment. This study examined the distribution of microplastics, and heavy metals extracted from microplastics, on the surface water of Saen Saeb canal. This canal is subjected to many human activities and has a large accumulation of garbage. Samples of microplastics were collected by a modified pump. The average microplastics concentrations were 479 p/m3 or 0.0856 g/m3 (size of 1-0.3 mm) and 261 p/m3 or 0.0415 g/m3 (size of 0.3-0.1 mm). The dominant colors of these microplastics were transparent-brown and transparent. These microplastics are related to land-based sources which break into secondary microplastics. Film and fiber/line were predominantly investigated in the surface water sample. Their chemical structures were analyzed by Fourier Transformed Infrared Spectroscopy (FTIR) which were confirmed to be polymeric with polypropylene (PP) and polyethylene (PE) being the most abundant. Heavy metals (cadmium, copper, lead, chromium and zinc) were also detected in the microplastics. Since this urban canal connects two main rivers which flow into the Gulf of Thailand, many aquatic organisms in the river might have an effect on this pollution. The results of this study showed that a strong recommendation to enforce the improvement of solid waste collection to prevent pollutants from entering the environment is necessary.
Keywords: microplastics, Saen Saeb canal, heavy metal, plastic debris, FTI