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Using the Batalin, Fradkin and Tyutin approach, the second-class higher derivative Maxwell–Chern–Simons–Proca model is converted into a mixed constrained one and then, the Hamiltonian path integral of the resulting mixed constrained system is constructed. The Hamiltonian path integral takes a manifestly Lorentz covariant form.

The main objective of our research is to identify the impact of recycling and waste reduction behavior on the sustainable tourism decisions of Romanian youngsters (18–25 years old). We used the PLS-SEM method and introduced four variables in the model: sustainable tourism decisions, the interest in recycling, the interest in waste reduction, and the interest in natural and less polluted touristic destinations. The main results emphasize the direct influence of recycling and waste reduction behaviors on the decisions made by Generation Z regarding sustainable tourism and on their preference for destinations that are better preserved and less touched by human intervention. The novelty of our research consists of the fact that we introduced variables such as waste reduction from the perspective of tourists because most studies address it as a management approach of the companies in the tourism sector. The findings are useful for managers in the tourism sector to create better strategies for attracting the younger generation who are preoccupied by environmental issues and sustainability in general.

The scientific literature comprises a relatively large palette of studies focusing on tourist preferences regarding the weather and climate at the destination. However, the findings do not allow for establishing a hierarchy of climate and environmental features of interest for tourism based on destination type (urban/rural/mountain/seaside), but mainly to list them. We aim to identify some characteristics of a potential climate service targeting tourists by addressing in particular three aspects: 1. which are the weather, climate and/or environmental features most commonly marked as of interest in the general case of 'any destination type' and for the particular case of rural destinations; 2. which are the delivery and presentation forms of greatest interest; 3. how willing would be the tourists to pay for such a service. To this end, we used a questionnaire with five closed questions regarding these aspects, disseminated in Romania and Italy. The results confirm some expectations based on scientific literature and highlight the user interest in information encompassing several climates and/or environmental aspects, preferably in one single product. The results may be valuable for developing and providing effective tourism-oriented climate and environmental products and contribute to a better user uptake of such products and services.

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