Policy recommendations for promoting touristic attractivity from local government perspective in innovative environments

The COVID-19 pandemic situation has had unprecedented negative consequences in the tourism sector, especially in the hotel industry, which has implied negative shocks directly and indirectly in city revenues, employment and economy. Recent research has indicated that technology is becoming central in finding solutions for tourism recovery through the development of newor improved ICT-enabled tourism services, which could help to achieving a higher attraction of tourists and other sources of foreign investments to cities. This paper therefore seeks to analyse the impact of blockchain technologies (BCT) on the tourism business for attracting new customers to cities with the aim at gaining insights regarding public policies to be taken by local governments for improving tourism business in their city. To achieve this aim, this paper provides an empirical research on the impact of BCT on both lowering prices and improving service quality of lodging accommodations by a sample of lodging accommodations in different Italian cities, providing insights to know if the implementation of BCT on hospitality business, can help city governments to improve smart living into the urban space, deriving some recommendations for city government to take public policies to favour the implementation of these technologies into the hospitality industry

Amphibia, Anura, Strabomantidae, <i>Pristimantis permixtus</i> Lynch, Ruiz-Carranza, and Ardila-Robayo, 1994: Distribution extension, Valle del Cauca, Colombia

Pristimantis permixtus is a moderate sized frog tipically of upper cloud forests and sub-páramo areas. Herewe provide the second record and southernmost of P. permixtus in the Occidental Cordillera in the department of Valle delCauca, Vereda Chicoral, municipality of La Cumbre, Colombia

Wigner phase space distribution as a wave function

We demonstrate that the Wigner function of a pure quantum state is a wave function in a specially tuned Dirac bra-ket formalism and argue that the Wigner function is in fact a probability amplitude for the quantum particle to be at a certain point of the classical phase space. Additionally, we establish that in the classical limit, the Wigner function transforms into a classical Koopman-von Neumann wave function rather than into a classical probability distribution. Since probability amplitude need not be positive, our findings provide an alternative outlook on the Wigner function's negativity.Comment: 6 pages and 2 figure

Effective gravity from a quantum gauge theory in Euclidean space-time

We consider a $SO(d)$ gauge theory in an Euclidean $d$-dimensional space-time, which is known to be renormalizable to all orders in perturbation theory for $2\le{d}\le4$. Then, with the help of a space-time representation of the gauge group, the gauge theory is mapped into a curved space-time with linear connection. Further, in that mapping the gauge field plays the role of the linear connection of the curved space-time and an effective metric tensor arises naturally from the mapping. The obtained action, being quadratic in the Riemann-Christoffel tensor, at a first sight, spoils a gravity interpretation of the model. Thus, we provide a sketch of a mechanism that breaks the $SO(d)$ color invariance and generates the Einstein-Hilbert term, as well as a cosmological constant term, allowing an interpretation of the model as a modified gravity in the Palatini formalism. In that sense, gravity can be visualized as an effective classical theory, originated from a well defined quantum gauge theory. We also show that, in the four dimensional case, two possibilities for particular solutions of the field equations are the de Sitter and Anti de Sitter space-times.Comment: 20 pages; Final version accepted for publication in Class.Quant.Gra

Aluminización de aceros ferriticos-martensiticos (hcm-12a) mediante cvd-fbr

Los recubrimientos de Aluminio son bien conocidos por tener una buena resistencia a la oxidación y a la sulfidización debido a la formación de una capa protectora de alúmina. La Deposición Química en Fase de Vapor mediante Lecho Fluidizado (CVD-FBR), debido a que es un proceso en el que se consiguen altas trasferencias de masa y calor a bajas temperaturas de operación. Además, tiene la ventaja de que se trabaja a presión atmosférica. La deposición de recubrimientos de Al sobre el acero ferrítico (HCM-12A) ha sido desarrollada mediante CVD-FBR. Los parámetros iniciales del proceso fueron determinados por la simulación termodinámica del proceso con la ayuda del programa informático “Thermocalc software”