PurposeThis study examines the impact of perceived value, materialism and tourist intention on willingness to pay a premium for ecotourism (WTPP).Design/methodology/approachData were collected and conducted in Vietnamese National Parks. The dataset consists of 927 valid responses by domestic travelers. Structural equation modeling (SEM) was used to test the proposed relationships among perceived value, materialism, tourist intention and tourists' WTPP.FindingsThis study found a significant positive effect of perceived value on both tourist intention and their WTPP. The results also indicated that materialism is revealed to have a totally negative influence on WTPP for ecotourism; its indirect effect is transmitted through tourist intention. These findings highlight that tourists are mainly attracted when they received unique information about eco-destination. Therefore, they tend to participate in ecotourism and decide to pay for ecotourism.Research limitations/implicationsFirst, the study findings contribute strategies for tourism providers in their marketing activities by segmenting the target market which can be based on tourists with materialistic and nonmaterialistic. Second, ecotourism marketers need to focus on increasing the unique image of ecological sites. These efforts will create a favorable action for tourists. Third, ecotourism providers might increase the prospective customer base among consumers who have materialistic behaviors. Furthermore, they can provide ecotourism promotion materials for targeting customers. Finally, government needs to consider strategies designed to enhance the eco-destination places and environmental intention.Practical implicationsFirst, the study has not compared the efficacy of two different measures which are affective and cognitive items in perceived value construct. Second, this research does not discuss about the interrelationships among other factors influencing tourists' WTPP. Third, the customers' demographic characteristics in this study did not explore because the difference on gender may be perceived differently in analyzing advertising. Fourth, this study was conducted in Vietnam, not in different countries and other different cultures.Originality/valueThis study investigates the impact of perceived value and materialism on ecotourism intention and tourists' WTPP for ecotourism. This study reveals the understanding of how individuals' concern about the value of ecological sites and influences their intention to actual behavior in engaging ecotourism. Significant practical implications are also provided for ecotourism providers, marketers and government. In general, government needs to consider strategies designed to enhance the eco-destination places and environmental intention. Ecotourism marketers need to focus on increasing the unique image of ecological sites. These efforts will create a favorable action for tourists. Otherwise, ecotourism providers might increase the prospective customer base among consumers who have materialistic behaviors. Furthermore, they can provide ecotourism promotion materials for targeting customers.

Background: The COVID-19 vaccine hesitancy or refusal has actually been a threat to global health. In the current situation, health profession students are at risk for SARS-CoV-2 infection during their internship at healthcare facilities. Furthermore, those future healthcare workers will advise people to accept the COVID-19 vaccination. Therefore, the attitude of students towards vaccine acceptance and the predicting factors needs to be elucidated. This study applied the Health Belief Model to determine predictors of COVID-19 vaccine acceptability among health professions students. Methods: 911 students participated in a cross‐sectional online survey in Vietnam. Multinomial logistic regression model determined predictors of the COVID-19 vaccine acceptability. Results: The overall vaccine acceptance, hesitancy, and refusal rates were 58% (95% CI: 54.7% - 61.3%), 40.4% (95% CI: 37.2% - 43.7%) and 1.5% (95% CI: 0.8% - 2.6%), respectively. Regarding vaccination hesitancy, a predictor such as "Receiving recent flu shots” had a negative correlation, whereas "Vaccines haves little efficacy & serious adverse effects” (Perceived barriers), nationality, and majors were positive correlates. For refusal, "Unvaccinated students feasibly infected COVID-19 during hospital internship” (Perceived susceptibility) was a negative correlate. For both hesitancy and refusal, "Mass media appreciating effectiveness and safety of vaccines" (Cues to action), and " Health professions students get serious complications of COVID-19 if not vaccinated" (Perceived severity) had a negative correlation. In contrast, "Manufacturers do not disclose adverse effects of vaccines" (Cues to action), and "Adverse effect causes death" (Perceived barrier) were positive correlates. Strong Health Belief Model predictors of vaccine refusal were "Manufacturers do not disclose adverse effects of vaccines" (Cues to action) (OR= 5.299, 95% CI: 1.687-16.641, p= 0.004), and "Adverse effect causes death" (Perceived barrier) (OR= 10.255, 95% CI = 3.528-29.814, p= 0.0005). Conclusion: Perceived susceptibility to and severity of COVID-19 might lead to vaccination acceptance among students. However, concerns of vaccine effectiveness and safety may still affect the choice of refusal or hesitancy in vaccination. Health information from mass media and transparency of vaccine effectiveness and safety could improve COVID-19 vaccine acceptance.

Background The COVID-19 vaccine hesitancy or refusal has actually been a threat to global health. In the current situation, health professions students are at risk for SARS-CoV-2 infection during their internship at healthcare facilities. Furthermore, those future healthcare workers will advise people to accept the COVID-19 vaccination. Therefore, the attitude of students towards vaccine acceptance and the predicting factors needs to be elucidated. This study applied the Health Belief Model to determine predictors of COVID-19 vaccine acceptability among health professions students. Methods Nine hundred eleven students participated in a cross-sectional online survey in Vietnam. Data were collected from 1st April to 30th June 2021. Data analysis was performed using SPSS software version 20.0 with Chi-square and Kruskal-Wallis tests before executing multinomial logistic regression to identify predictors of the COVID-19 vaccine acceptability Results The overall vaccine acceptance, hesitancy, and refusal rates were 58% (95% CI: 54.7% - 61.3%), 40.4% (95% CI: 37.2% - 43.7%) and 1.5% (95% CI: 0.8% - 2.6%), respectively. Regarding vaccination hesitancy, a predictor such as "Receiving recent flu shots” had a negative correlation, whereas "Vaccines have little efficacy & serious adverse effects” (Perceived barriers), nationality, and majors were positive correlates. For refusal, "Unvaccinated students feasibly infected COVID-19 during hospital internship” (Perceived susceptibility) was a negative correlate. For predicting both hesitancy and refusal, "Mass media appreciating effectiveness and safety of vaccines" (Cues to action), and " Health professions students get serious complications of COVID-19 if not vaccinated" (Perceived severity) were negative predictors. In contrast, "Manufacturers do not disclose adverse effects of vaccines" (Cues to action), and "Adverse effect causes death" (Perceived barrier) were recognized as positive predictors. Strong Health Belief Model predictors of vaccine refusal were "Manufacturers do not disclose adverse effects of vaccines" (Cues to action) with OR= 5.299(95% CI: 1.687-16.641, p= 0.004), and "Adverse effect causes death" (Perceived barrier) with OR= 10.255 (95% CI = 3.528-29.814, p= 0.0005). Conclusion Health professions students' acceptability of COVID-19 vaccination might be based on the perceived susceptibility to and severity of COVID-19, concerns about vaccine efficacy and safety, and the influence levels of information from various sources. Health education and measures to prevent the harmful effects of COVID-19 vaccine misinformation could potentially improve the acceptance rate of the COVID-19 vaccine

This paper investigates the recollision dynamics of the nonsequential double ionization process induced by linearly polarized laser pulses with the three-dimensional classical ensemble model. The results show that the correlated two-electron momentum distribution is contaminated by the double recollision events for sufficiently short laser wavelength. When the laser wavelength increases from near-infrared to mid-infrared, the single-recollision events are more prominent than the double-recollision one. Moreover, the mechanisms governing the nonsequential double ionization process are also thoroughly studied in the case of double-recollision.

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