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Geomorphometry plays a fundamental role in the study and analysis of the earth's surface, providing a conceptual and methodological basis for understanding the characteristics of the physical environment. In this context, the Grijalva and Usumacinta River basins (CGyU), shared by Mexico, Guatemala, and Belize, stand out for their water abundance, natural richness, and high vulnerability to extreme hydrometeorological events. The main objective of this research is the geomorphometric characterization of the CGyU. For this purpose, hierarchical classification was developed using Hammond's method and the process was automated using Geographic Information Systems (GIS) adapted by Dikau. The results revealed the existence of five main classes and eighteen subclasses of landforms in both watersheds. Based on these findings, we can conclude that the methodology employed proved to be reliable for describing landforms in these watersheds. Therefore, this study contributes to new research and the implementation of public policies related to land use planning, civil protection, and biodiversity, among others., La geomorfometría desempeña un papel fundamental en el estudio y análisis de la superficie terrestre, proporcionando una base conceptual y metodológica para comprender las características del medio físico. En este contexto, las cuencas del río Grijalva y Usumacinta (CGyU), compartidas por México, Guatemala y Belice, destacan por su abundancia hídrica, riqueza natural y alta vulnerabilidad a los eventos hidrometeorológicos extremos. El objetivo principal de esta investigación es la caracterización geomorfométrica de las CGyU. Para ello, se desarrolló la clasificación jerárquica mediante el método de Hammond y se automatizó el proceso utilizando Sistemas de Información Geográfica (SIG) adaptada por Dikau. Los resultados revelaron la existencia de cinco clases principales y dieciocho subclases de formas del terreno en ambas cuencas. Con base en estos hallazgos, podemos concluir que la metodología empleada demostró ser confiable para describir las formas del terreno en estas cuencas. Por tanto, este estudio contribuye al desarrollo de nuevas investigaciones y a la implementación de políticas públicas relacionadas al ordenamiento territorial, la protección civil, la biodiversidad.

The performance of an industrial air amplifier is assessed through experimental and numerical characterization, with a focus on examining the influence of various operating conditions (isolated, “blowing,” and “suction” modes) and direct geometric scaling of the device within the specified range of the injection gap (XXXXX) and the inlet pressure characteristic values. The findings underscore the presence of a linear trend of the entrained mass flow and a nonlinear decay of the amplification factor, both with notable sensitivity to the gap width. Numerical RANS simulations validate the experimental data, characterize the asymmetric flow downstream from the device, and facilitate the exploration of more complex scenarios. In this regard, scaling the device’s dimensions reveals an optimal aspect ratio between the minimum diameter (XXXXX) and XXXX to maximize the entrained mass flow. This research provides valuable insights into the behavior of air amplifiers, offering guidance for their design and application across various industrial contexts.

María Cecilia Marini,1 Martín Lucas Berra,2 Fernada Girado,3 Paula Alejandra Albera,4 Melina Sol del Papa,5 María Silvia Passerini,5 Alejandro Javier Aguilar6 1Ophthalmology Service, El Cruce-Nestor Kirchner High Complexity Hospital, Buenos Aires, Argentina; 2Cornea Transplant Service, Pedro Lagleyze Institute, Autonomous City of Buenos Aires, Argentina; 3Ophthalmology Service, Churruca-Visca Police Medical Complex, Autonomous City of Buenos Aires, Argentina; 4Ocular Surface Service, Santa Lucia Ophthalmological Hospital, Autonomous City of Buenos Aires, Argentina; 5Medical Affairs Department, Poen Laboratories, Autonomous City of Buenos Aires, Argentina; 6Ocular Surface Service, Lomas de San Isidro Medical Group, Buenos Aires, ArgentinaCorrespondence: Melina Sol del Papa, Medical Affairs Department, Poen Laboratories, Gómez de Fonseca 652, Autonomous City of Buenos Aires, C1407 ATL, Argentina, Tel +54 946 700100, Email investigacion@poen.net.arPurpose: To study the efficacy and toxic effects of bepotastine besilate 1.5% preservative-free (BB-PF) and olopatadine 0.2% BAK-preserved (OL-BAK) drops on the ocular surface of patients with allergic conjunctivitis.Patients and Methods: Ninety-seven patients with allergic conjunctivitis diagnosis participated in a prospective, multicenter, randomized, double-blind, controlled, parallel-group clinical trial. Patients received either BB-PF (n=48) or OL-BAK (n=49), both administered once daily in the morning. The patients were followed for 60 days. Ocular itching was the primary outcome measure. Secondary outcomes included ocular symptoms, signs, and non-ocular symptoms associated with rhinoconjunctivitis. Conjunctival impression cytology (CIC) was performed to evaluate histopathological changes related to the toxic effects of preservatives.Results: BB-PF treatment was associated with a 1.30 more probability of diminished ocular itching than OL-BAK (odds ratio (OR)=1.30; 95% CI=(0.96– 1.7); p=0.086). No statistically sig