A novel bio-inspired algorithm, namely, Dingo Optimization Algorithm (DOA), is proposed for solving optimization problems. The DOA mimics the social behavior of the Australian dingo dog. The algorithm is inspired by the hunting strategies of dingoes which are attacking by persecution, grouping tactics, and scavenging behavior. In order to increment the overall efficiency and performance of this method, three search strategies associated with four rules were formulated in the DOA. These strategies and rules provide a fine balance between intensification (exploitation) and diversification (exploration) over the search space. The proposed method is verified using several benchmark problems commonly used in the optimization field, classical design engineering problems, and optimal tuning of a Proportional-Integral-Derivative (PID) controller are also presented. Furthermore, the DOA’s performance is tested against five popular evolutionary algorithms. The results have shown that the DOA is highly competitive with other metaheuristics, beating them at the majority of the test functions.

In this communication, the design and electromagnetic absorption of a metamaterial coating with a broad modulable absorption in the 8 to 12 GHz frequency range, corresponding to the X-band, is reported. The unit of the coating material consists of a chessboard with chess squares of different heights made of a rGO/Fe ₃ O ₄ /PPy composite. The influence of the height ratio of the chess squares in a $5 \times 5$ chessboard on the reflection loss ( $R_{L}$ ) response of electromagnetic radiation in the X band was studied in silico . The results demonstrate that the chessboard-like microwave absorber exhibit tunable response, with a maximum effective reflection loss of −37.43 dB/GHz in the X band range, ca. 24 % higher than the best single layer coating.

In this study, Fe₃O₄-chopped carbon fiber (CF) fillers with varying CF:Fe₃O₄ weight ratios (1:0.5, 1:0.75, and 1:1) were fabricated using the wet chemical reduction method. Different weight percentages (1, 3, 7 wt.%) of the CF/Fe₃O₄ fillers were used to fabricate lightweight, flexible, and porous thermoplastic polyurethane (p-TPU) composites for electromagnetic interference (EMI) shielding applications. Due to its poor electrical and magnetic properties, the TPU matrix alone exhibited negligible shielding effectiveness. The electromagnetic interference (EMI) performance of TPU composites is greatly affected by the amount of filler materials, the CF/Fe₃O₄ ratio, and the porous structure, which in turn influence the interfacial interactions between filler and p-TPU matrix. Effective electromagnetic attenuation is achieved by conductive CF network, interfacial polarization at CF/Fe₃O₄/TPU interfaces, and multiple internal reflections promoted by microstructural heterogeneity and porosity. A maximum EMI shielding effectiveness (SE_T) of 22.28 dB was achieved for a CF/Fe₃O₄/p-TPU composite with a filler load of 7 wt.%, a CF:Fe₃O₄ ratio of 1:1, and a porosity of 15%.

La evaluación del cumplimiento de los Objetivos del Desarrollo Sostenible (ODS) está a cinco años de distancia, en un contexto en el que se está llegando al límite de 1.5ºC en el calentamiento global. Este artículo revisa las investigaciones realizadas en el marco de los ODS respecto a energías limpias y almacenamiento de electricidad usando materiales abundantes y de menor impacto ambiental e incluso materiales generados a partir de residuos recuperados; materiales para temas de salud como la atenuación de radiación electromagnética y finalmente, el monitoreo de la calidad del ambiente en una zona urbana altamente industrializada, más algunas estrategias de remediación basadas en materiales avanzados. Estos trabajos se llevan a cabo por una red de investigación basada en Altamira, México entre instituciones consolidadas y de reciente creación.