Infrared drying is an advanced drying method that preserves the nutritional value of the dried object. Currently, dragon fruit drying on a static tray by hot air circulation reveals disadvantages of long drying time and ununiform moisture distribution. In this study, Vietnam red dragon fruit was dehumidified in a vertical cylindrical infrared dryer. The drying mode includes radiation intensity in the range of 4 to 6 kW/m2 and air velocity in the range of 1 to 3 m/s to investigate moisture transfer parameters and vitamin content in dragon fruit. The drying time was fixed at 10 hours to evaluate the final moisture content and vitamin contents. Henderson and Pabis drying model was adopted with the coefficient of determination greater than 0.98. Results show that the moisture diffusivity in the infrared drying was achieved in the range of 2.3e-9 to 3.9e-9 m2/s. Moisture transfer coefficient of the dragon fruit varied in the range of 4e-5 to 1.2e-4 m/s. The Biot number in the drying by an infrared lamp ranged from 40 to 80. Vitamin C in dried dragon fruit has a high content of up to 13.5 mg/100 g. The current dragon fruit drying by infrared lamp reveals negligible surface resistance to mass transfer. The infrared drying of dragon fruit is a feasible alternative to preservation. Also, seeking of an optimal tray rotation speed may be further improvement of the drying rate.
This study examinesthe factors affecting tourist experience expectations in the Central Highlands of Vietnam. A survey questionnaire and focus group discussion were used to gather data from tourists visiting the region. This study was conducted through a cross-sectional survey using purposeful sampling (n=200). Multivariable linear regression analysis techniques and moderator regression were applied to prove the proposed hypotheses. The results of the study revealed that psychological factors, such as motivation and perception, were also identified as important determinants of experience expectations. Socio-cultural factors, such as cultural values and norms, were found to play a role in shaping experience expectations, while economic factors, such as budget and exchange rate, were found to be critical in determining experience expectations. Environmental factors, such as climate and environmental quality, were also found to have a significant impact on experience expectations. The findings of this study contribute to our understanding of the factors influencing tourist experience expectations and have implications for tourism stakeholders in the Central Highlands of Vietnam.
In the context of globalization, English is becoming more and more critical in developing countries like Vietnam. Learning English in this country is compulsory and systematic from preschool to higher education. As a result, English proficiency put tremendous pressure on Vietnamese workers to have more job opportunities and increased income. The objective of this study was to examine the role of English proficiency in the satisfaction, performance, and wages of Vietnamese workers. This study was conducted through a cross-sectional survey using purposeful sampling (n=200). Multivariable linear regression analysis techniques and moderator regression were applied to prove the proposed hypotheses. The research results show that English proficiency has a positive and significant relationship with Vietnamese workers’ satisfaction, performance, and salary. The factor of language proficiency is a moderating variable between employee satisfaction and compensation.
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