The aim of this bibliometric analysis was to evaluate the evolution of scientific research in hydrogen, focusing on green hydrogen production, storage, and utilization. Articles from prominent databases were analyzed, revealing a strong emphasis on sustainable hydrogen technologies through keywords like “hydrogen production”, “green hydrogen”, and “solar power generation”. Mature research areas include production methods and electrolysis, while emerging topics such as energy efficiency and policy are gaining traction. The most-cited papers, from Energy Conversion and Management to the International Journal of Hydrogen Energy, cover techno-economic assessments and case studies on deploying hydrogen technologies. Key findings highlight the variability of the Levelized Cost of Hydrogen (LCOH) across technologies and regions. Deep learning applications, including Fast Fourier Transform-based forecasting and explainable AI models, are transforming production optimization, while Life Cycle Assessment (LCA) emphasizes renewable energy’s role in reducing carbon intensity and resource consumption. Diverse strategies, such as fiscal incentives for wind energy and use of urban waste, underline the importance of local solutions. This analysis reflects the rapid growth of hydrogen research, driven by international collaboration and innovations in sustainable production, storage, and optimization. It is hoped that this paper will help to shed more light on the current and future understanding of green hydrogen.

In Peru, as in many countries worldwide, varying degrees of restrictions have been established on the movement of the population after the World Health Organization (WHO) declared the condition of pandemic by COVID-19. In Lima, there have been different degrees of compulsory social immobilization (CSI), and the resumption of activities was planned in three consecutive phases. To analyse and evaluate the influence of such restrictions on the evolution of environmental noise, an investigation was carried out in one of the main avenues in the city of Lima during various successive mobility restriction conditions. The sound pressure level was measured, and the traffic flow was also registered. Considering that in Peru there is no environmental noise monitoring system whatsoever, in situ data are extremely valuable and allow the environmental noise problem to be depicted, even if in a limited area of the big city. The results show that in spite of the strongly restrictive social immobilization conditions, the measured noise levels have remained above the WHO recommendations and often above the Peruvian environmental noise quality standards. The results highlight the need to properly assess the environmental noise and noise sources in the city of Lima as well as the number of people exposed in order to adequately implement effective and cost-efficient noise mitigation action plans.

The objective of this research was to evaluate the sustainability of a co-treatment system that combines Municipal Wastewater (MW) and Acid Mine Drainage (AMD) through the technique of intermittent electrocoagulation, applied as an advanced solution to improve contaminant removal efficiency and optimize energy balance. Four scenarios were analyzed: Treatment I (with a 1/7 ratio of urban wastewater to AMD), Treatment II (which includes an artificial wetland), Treatment IIIa (which introduces electrocoagulation to enhance sulfate removal and pH regulation), and Treatment IIIb (which employs a 1/15 ratio of AMD to eutrophic water). The methodology focused on calculating key sustainability indicators such as the Net Yield Ratio (EYR), Emergy Inversion Ratio (EIR), Environmental Loading Ratio (ELR), and Sustainability Index (SI), in order to assess the impact of each technology on the energy efficiency and environmental load of the system. The results showed that, although Treatment IIIa was effective in contaminant removal, the EIR increased to 0.18 and the ELR rose to 0.62, indicating a higher reliance on non-renewable inputs due to increased energy demand. However, Treatment IIIb, which combines electrocoagulation with eutrophic water, significantly improved the sustainability of the system, achieving an SI of 2.31 and an ELR of 1.22, reflecting a reduction in energy efficiency due to intensive use of external resources, but overall greater sustainability compared to the other scenarios. This research concludes that intermittent electrocoagulation, when integrated with synergistic resources like eutrophic water, can enhance contaminant removal efficiency and improve the use of renewable resources, minimizing environmental load and increasing the sustainability of wastewater treatment systems.

Después de que la Organización Mundial de la Salud estableciera la condición de pandemia por el COVID-19, los distintos países establecieron diversas restricciones para hacer frente a la enfermedad, en ese contexto el gobierno del Perú emitió la Declaratoria del Estado de Emergencia Sanitaria así como la regulación de las condiciones de Inmovilización Social Obligatoria que restringía el desarrollo de diversas actividades comerciales, el objetivo del estudio fue analizar y evaluar los efectos de las medidas restrictivas sobre el flujo vehicular y los niveles de ruido en la Avenida Brasil, una de las más importantes vías en la ciudad de Lima. El estudio tuvo una duración de cinco meses y su inicio coincidió con el comienzo de la primera inmovilización social, durante este periodo los niveles de ruido equivalente no sobrepasaron los Estándares de Calidad Ambiental (ECAs) tanto diurno (70 dBA) como nocturno (60 dBA), estableciéndose un Leq-diurno de 66,2 ± 3,7 dBA y un Leq-nocturno de 57,9 ± 1,6 dBA, Al final del periodo el nivel de ruido logra sobrepasar los ECAs registrando un Leq-diurno de 71,6 dBA y un Leq-nocturno de 63,5 dBA, por su parte el flujo vehicular en hora punta (07:00-08:00 h) se redujo hasta los 495 v/h en el primer día de inmovilización para terminar registrando 655 v/h al final del estudio

This research aims to evaluate the economic valuation of lead air pollution in the AA.HH. Virgen de Guadalupe, Callao, Peru. A survey was conducted with 182 residents, focusing on air quality, temporary exposure to pollution, aesthetic appreciation of the environment, willingness to accept (WTA) economic compensation, and willingness to pay (WTP) to mitigate lead air pollution. The data were analyzed using the logit model through STATA16 software. The results revealed that 62.09% of respondents were willing to accept economic compensation, while 56.04% expressed willingness to pay for reducing lead pollution. Furthermore, it was determined that the average monthly WTP is PEN 62.48 (USD 16.47), amounting to PEN 1,201,865.28 (USD 329,103.16) annually for the entire population of 1603 residents. In contrast, the average monthly WTA per resident is PEN 153.59 (USD 40.48), totaling PEN 2,954,457.24 (USD 809,010.16) annually due to lead air pollution. The study concluded that environmental perception, awareness, the desire to maximize present utility, and uncertainty about the future significantly influence the economic valuation of lead air pollution in this community.

The aim of the study was to evaluate the geochemistry of the Winchos Gabbro and its association with magnetite mineralization at the Winchospunta prospect located in Carhuamayo-Junin, Peru. The methodology included systematic sampling of 24 rock and mineralization samples, petrographic and geochemical laboratory analyses using X-ray diffraction and inductively coupled plasma mass spectrometry (ICP-MS), with emphasis on the mineralogical composition and geochemistry of major elements (Fe₂O₃, SiO₂, MgO), trace elements (V, Cr, Cu), and rare earth elements (LREE and HREE). The results indicated that the Winchos Gabbro contains 12–16% Fe₂O₃, while the Mitu Group volcanics contain 16–23%, in contrast with the massive magnetite in the region, which reaches Fe₂O₃ concentrations between 69% and 87%. These observations suggest a strong genetic connection between the Winchos Gabbro, the Mitu volcanics, and the formation of magnetite, reinforced by the association of trace elements such as V, Cr, and Cu, typical of magmatic and hydrothermal processes. Principal component analysis showed clear groupings, where elements like Cu and U are associated with hydrothermal phases, while Fe and Zn exhibit affinities with metal oxides. These results confirm that the magnetite mineralization in Winchospunta formed under conditions of hydrothermal-magmatic interaction, with differential contributions of elements from the intrusive and volcanic rocks, consolidating its potential as a significant mineral deposit.