An approach for computing AS/R systems travel times in a class-based storage configuration

This study provides an approach to compute the travel time for AS/R systems in a class-based storage environment. A regression analysis is completed in order to define the importance of the key predictors taken into account and to propose a formulation of travel times. The results show the reliability of the model and allow to evaluate the travel time through the identification of a complete list of predictors. The proposed approach supports managers in theex-ante definition of travel times for a warehouse. A correct evaluation of travel times enables a better monitoring of the performance of warehouse operations and can support practitioners in the choice of the configuration not only in terms of kind of cycle, but also from a policy assignment perspective. From a theoretical point of view, this work can be considered as an attempt to refine the existing methods to compute travel times

Cuantificación simultánea de colorantes en bebidas deportivas utilizando espectroscopia visible y PLS-1

En este trabajo se propone un nuevo procedimiento para la cuantificación de cuatro colorantes artificiales: rojo allura, azul brillante, tartrazina y amarillo ocaso, presentes en bebidas hidratantes de la marca Gatorade y Powerade. Se aplico espectroscopía visible y calibración multivariada. Los datos fueron tratados con el programa Matlab y la rutina MVC1 aplicando el método PLS-1. Los resultados de las predicciones aplicando este nuevo método, se compararon estadísticamente con los obtenidos aplicando el método de referencia (cromatografía líquida), en todos los casos los resultados fueron comparables. La desventaja es que el amarillo ocaso no pudo ser cuantificado por este método, aunque su presencia no interfiere con la determinación de los otros tres colorantes. Puede concluirse que este método es fácilmente aplicable para el control de calidad de colorantes en bebidas comerciales en laboratorios de baja complejidad, sin necesidad de recurrir a técnicas separativas y reactivos contaminantes.Fil: Rodríguez, María Celeste. Universidad Nacional del Litoral. Facultad de Bioquímica y Ciencias Biológicas; ArgentinaFil: Schenone, Agustina Violeta. Universidad Nacional del Litoral. Facultad de Bioquímica y Ciencias Biológicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Santa Fe; ArgentinaFil: Sobrero, M. S.. Universidad Nacional del Litoral. Facultad de Bioquímica y Ciencias Biológicas; ArgentinaFil: Marsili, N. R. . Universidad Nacional del Litoral. Facultad de Bioquímica y Ciencias Biológicas; Argentin

Numerical Models for the Prediction of Ship Airborne Noise Emissions

The airborne noise emitted by ships represents a pollution source affecting the surrounding environment and third parties. Nowadays, in addition to numerous other kinds of environmental impacts due to shipping activities, ship airborne radiated noise in the latest years has captured the attention of universities, industries, and Regulatory Bodies. Even though this problem can be quite annoying and has raised serious complaints from the citizens of areas close to ports, shipping routes along the coast, or inland waters, the acoustic impact of ships to date has not been subjected to systematic control. The problem is primarily driven by the presence of powerful sound sources on ships and the fact that inhabited areas are often in close proximity to areas where ships operate. In response to the need to regulate the noise emitted by ships, Lloyd's Register introduced a class notation in 2019 specifically for airborne noise emissions from ships. This notation also includes a procedure for granting the notation. Within this context, the development of mathematical models to predict the propagation of noise in the air can serve as a valuable tool for anticipating and controlling the impact of ship-related airborne noise. This paper, reports problems and methods on the practical implementation of the required classification checks, in particular as regards the simulation and validation problems. As an application example, a small part of the results obtained during an industrial research activity aimed at assessing the noise radiated into the air by a passenger ship is reported

Source characterization guidelines for noise mapping of port areas

Maritime transport for both passengers and freight is continuously increasing and, consequently, the global attention toward its sustainability is growing. Ships offer advantages in terms of environmental impact compared to other transportation systems but the increasing traffic volume is expected to increase pollutants. Noise produced in port areas has been neglected for too long, until the INTERREG Maritime programme Italy-France 2014\u20132020 has brought to light how citizen complaints are emerging for some of the main ports in the Mediterranean. However, port noise prevention and management is difficult as knowledge on specific sources is very limited in the literature. Furthermore, on field measurements are difficult to be performed given the complexity of the port area, where multiple types of sound emitters mix and confuse each other. Noise maps represent the first important step in order to align ports to the requirements set by the Environmental Noise Directive to the transportation infrastructures. Once computed, they are an excellent tool supporting port management towards the reduction of citizens\u2019 noise exposure while ensuring traffic growth. The present paper reports a guideline for the characterization of noise sources needed as inputs for the noise maps, as developed in the framework of the INTERREG Maritime programme Italy-France 2014\u20132020. On the basis of the current state of the art, a procedure has been elaborated for different categories of noise sources acting in port, ranging from stationary to moving ships, from mooring operations to loading/unloading operations, from industrial activities to road and railway traffic

Optimization Model of a Tandem Water Reservoir System Management

This paper presents a complex approach for modelling of a tandem reservoir systems for water drainage management. The model has been built over a segment of a river with a certain parameters of water inflow, water outflow, required power production and max possible flood occurrence. Then the segments may be replicated with specific parameters to simulate whole system of the river. The model has been optimized in order to obtain the water drainage operation policy with regards of current and expected water volumes in the reservoirs ratio, required power production revenue, and minimal flood occurrence. Model has been verified on a walk-through basis. The obtained results demonstrate good reliability disregards broad possible variations of the managed parameters and provide the optimal water drainage for minimum flood occurrence and desired power production revenue

Sound Absorption of Polyimide Foams, an Experimental Study

Polyimide foam panels have emerged as advanced solutions in naval, nautical, aeronautical, and railway industries, overcoming limitations associated with the high densities and thicknesses of traditional thermal and acoustic insulation materials. This study aims to experimentally characterize the sound absorption coefficient of both standard and mechanically crushed polyimide foams within the 200-4300 Hz frequency range, utilizing the Standing Wave method with three microphones. Thermally cut samples, designed for thermal insulation, show significant absorption in high-frequency ranges but are less effective at lower frequencies. Remarkably, the mechanical compression of these samples transforms closed pores into open and interconnected structures, substantially enhancing absorption at lower frequencies. This phenomenon is also observed in acoustically cut samples. Polyimide foam shows tuneable sound absorption, with the degree of enhancement dependent on variables such as the number of compression cycles, the applied force magnitude and rotational forces (not evaluated in this paper). Further investigation into these mechanical influences promises insights into optimizing the acoustic performance of polyimide-based solutions

Macrohongos presentes en un área de manejo renegenerativo de bosque de Mata Atlántica (Misiones, Argentina)

Macrofungi present in a recovered zone of Atlantic Forest (Misiones, Argentina). Atlantic Forest is an ecosystem historically managed without restrictions. Over the years, this situation led to a fragmentation of the forest environment with the consequent loss of habitats for all kinds of organisms in the region. The present work is a checklist of macrofungi found in a native forest in Oberá (Misiones, Argentina), where conservation and regeneration practices have been held since 2009 to recover its natural state. Sampling took place in different seasons for 3 years. 136 species have been identified, distributed in 13 orders, 32 families and 86 genera. The objective of the present work was to set a precedent of macrofungi diversity in the area. This will allow studying macrofungi ecological succession and their potential as bio-indicators of forest recovery.El Bosque de Mata Atlántica es un ecosistema que histórica y continuamente se ve sometido a manejo forestal desmedido. Esto ha generado una fragmentación del ambiente boscoso con su consecuente pérdida de hábitat para todo tipo de organismos de la región. El objetivo del presente trabajo fue generar un listado de especies de macrohongos presentes en un área de manejo de bosque regenerativo en la zona de Oberá (Misiones, Argentina), donde desde 2009 se llevan a cabo tareas de recuperación y regeneración de biodiversidad del Bosque de Mata Atlántica. Se realizaron muestreos a campo en diferentes estaciones durante 3 años. Como resultado se presenta un catálogo de especies de macrohongos presentes en la zona que consta de 136 especies distribuidas en 13 órdenes, 32 familias y 86 géneros. Este conocimiento permitirá profundizar estudios en distintos grupos de macrohongos y analizar su capacidad como bioindicadores del estado de conservación de la zona de Bosque Atlántico en proceso de recuperación

Studying functional networks in human brain through intracerebral spontaneous EEG

none6G.Arnulfo; A.Pigorini; M.Massimini; L.Nobili; A.Schenone; M.M. FatoArnulfo, Gabriele; Pigorini, A.; Massimini, M.; Nobili, L.; Schenone, Andrea; Fato, MARCO MASSIM