Fast Transmitarray Synthesis with Far-Field and Near-Field Constraints.

Millimeter-wave communications can potentially provide high-data-rate transmission. In addition, in the case of indoor small cells, new needs related to the radiation pattern of the antennas are emerging. In this work, a technique for the synthesis of planar transmitarray antennas with simultaneous near-field and far-field requirements is proposed. It is based on an iterative process, going from synthesized sources to generated field and back, through three operations: near-field computation as the sum of far-field contributions from the array elements, and inverse and direct fast Fourier transforms. As a result, the technique is very efficient from the point of view of computing time. In order to demonstrate the ability of the method, two examples are studied: one of them with a null in the near-field region and the other with a focal point, both pointing simultaneously in a specific far-field direction. The results are validated by manufacturing two dielectric "quasi-planar" prototypes at 26 GHz. The measure of the prototypes is in good agreement with the results advanced by the algorithm. These preliminary results suggest that the method can be extended to more complex scenarios.

Deepint.net: A Rapid Deployment Platform for Smart Territories.

This paper presents an efficient cyberphysical platform for the smart management of smart territories. It is efficient because it facilitates the implementation of data acquisition and data management methods, as well as data representation and dashboard configuration. The platform allows for the use of any type of data source, ranging from the measurements of a multi-functional IoT sensing devices to relational and non-relational databases. It is also smart because it incorporates a complete artificial intelligence suit for data analysis; it includes techniques for data classification, clustering, forecasting, optimization, visualization, etc. It is also compatible with the edge computing concept, allowing for the distribution of intelligence and the use of intelligent sensors. The concept of smart cities is evolving and adapting to new applications; the trend to create intelligent neighbourhoods, districts or territories is becoming increasingly popular, as opposed to the previous approach of managing an entire megacity. In this paper, the platform is presented, and its architecture and functionalities are described. Moreover, its operation has been validated in a case study where the bike renting service of Paris-Vélib' Métropole has been managed. This platform could enable smart territories to develop adapted knowledge management systems, adapt them to new requirements and to use multiple types of data, and execute efficient computational and artificial intelligence algorithms. The platform optimizes the decisions taken by human experts through explainable artificial intelligence models that obtain data from IoT sensors, databases, the Internet, etc. The global intelligence of the platform could potentially coordinate its decision-making processes with intelligent nodes installed in the edge, which would use the most advanced data processing techniques.

Estudio sobre la lixiviación de cadmio, cromo y plomo de un limpiador lingual en saliva artificial / Study on the leaching of cadmium, chromium and lead from a tongue cleaner onto artificial saliva

Objetivos: Determinar la presencia y concentración de los metales plomo, cadmio y cromo migrados desde el limpiador lingual "Alitest" en saliva artificial, y estimar la exposición oral a estas sustancias. Material y métodos: Diseño pre-experimental y analítico, para cuantificar las sustancias que son liberadas desde el limpiador lingual al contacto con saliva artificial. Los metales fueron analizados por AAS. Se estimaron los valores de exposición por ingesta oral que fueron comparados con valores de ingesta diaria tolerable para cada grupo etario. Resultados: Se cuantificó la migración de cadmio y cromo en concentraciones promedio de 0.008mg/L y 0.437 mg/L, respectivamente. La concentración de plomo estuvo por debajo de los niveles detectables utilizando el método. A partir de estos valores se estimó la ingesta oral para cada grupo etario y se comparó con el valor provisional de ingesta mensual tolerable (PTMI) o Dosis de Referencia (RfD). Conclusiones: Las sustancias se cuantificaron en concentraciones normales, que no excedieron los valores máximos recomendados.

Objectives: To determine the concentration of heavy metals cadmium and chromium leached from the tongue cleaner "Alitest" into artificial saliva and to assess oral exposure of these substances. Material and methods: Analytical pre-experimental design, to determine the amount of those substances released from the tongue cleaner onto artificial saliva and to quantified them by AAS. Assessment of exposure from oral intake values and comparison with the Provisional Tolerable Monthly Intake (PTMI) or Reference Dose (RfD) values. Results: Cadmium and chromium leachated into artificial saliva were quantified in concentrations of 0.008mg/L and 0.437 mg/L, respectively. Lead concentration was under detectable levels using the method. These values were used to estimate the oral intake for each age group and were compared to PTMI or RfD values. Conclusions: The substances were found in normal concentrations, none exceeding the maximum values of PTMI or RfD.