For the Remotely Piloted Aircraft Systems (RPAS) market to continue its current growth rate, cost-effective "Detect and Avoid" systems which enable safe beyond visual line of sight (BVLOS) operations are critical. We propose an audio-based "Detect and Avoid" system, composed of microphones and an embedded computer, which performs real-time inferences using a sound event detection (SED) deep learning model. Two state-of-the-art SED models, YAMNet and VGGish, are fine-tuned using our aircraft sounds dataset and their performances are compared for a wide range of configurations. YAMNet, whose MobileNet architecture is designed for embedded applications, outperformed VGGish both in terms of aircraft detection and computational performance. YAMNet's optimal configuration, with > 70% true positive rate and precision, results from combining data augmentation and undersampling with the highest available inference frequency (i.e. 10 Hz). While our proposed "Detect and Avoid" system already allows the detection of small aircraft from sound in real time, a larger dataset, sensor fusion, or the use of cloud-based services for remote computations could further improve its performance.

Purpose This study aims to propose and test a model of educational quality in marketing-management by incorporating resource-capability variables that are linked to learning outcomes for students and the competitive positioning of universities. Design/methodology/approach Drawing on the resource-dependence theory, this study develops a comprehensive model for measuring educational quality. A sample comprising Spanish university teachers has been used to test the hypothesised relationships by using a two-stage least squares regression analysis while controlling for the possible effect of the public/private nature of the university. Findings The results validate the model and show that educational capabilities are reliable variables for predicting the educational quality of marketing-management programmes at Spanish universities. Research limitations/implications Similar to all educational research studies, certain problems have been acknowledged with respect to the data and the theoretical constructs that are used in the study. Future studies can replicate this study’s model by using more direct objective measures of the theoretical constructs and extend the study to other countries with different educational contexts. Practical implications The results provide guidance to marketing teachers at a university in designing high-quality marketing-management educational programmes and in developing self-diagnostic tools that can determine a university’s likelihood of competitive success. Originality/value This study is one of the few studies to apply the resource-dependence theory to the analysis of the variables associated with the quality of marketing-management education. In doing so, the study presents original multiitem scales to improve the measurement of model constructs.

Una consecuencia de la actual pandemia por COVID-19, es el incremento del uso de desinfectantes, como el amonio cuaternario e hipoclorito de sodio. Debido a esto, se ha generado un aumento en la contaminación de las aguas, siendo necesario buscar soluciones a esta nueva problemática. Esta investigación pretende comparar los mecanismos existentes, para posteriormente elegir el más adecuado en la remediación del agua contaminada por amonio cuaternario e hipoclorito de sodio, a partir de una búsqueda bibliográfica. Se realizó una selección de documentos, para su posterior estudio, donde se organizaron a través de una tabla comparativa y un diagrama. De los resultados analizados, se presentan cuatro métodos para la descontaminación del agua: (I) fotólisis, (II) electro-oxidación, (III) carbón activado y (IV) contactor de membrana. Se puede concluir que carbón activado es el mejor candidato, es la forma más eficiente para la descontaminación de aguas por sus características, como su capacidad de reutilización y adsorción de compuestos, transformándolos en metabolitos menos tóxicos.

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Se analiza la problemática esencial planteada por la cristiandad en el esfuerzo de Pablo de Tarso por universalizar el mensaje de la fe más allá de las limitaciones propias de la razón ("los griegos buscan sabiduría") y del signo ("los judíos procuran señales"). Se indica cómo la tradición paulina opta por la "locura de la predicación" como medio y salida del cristianismo para acceder a la salvación por vía de la "locura de la cruz".