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Item type:Publication, Design of a ventilation control system in underground mines and tunnels(2021-09-19)Today no one is free of accidents, especially in high-risk work environments such as in-mine and/or tunnel work. It is quite common that in this type of high-risk activities and where evacuation accesses are distant from the area of operations, the response time plays an important role in the event of a dangerous event, which can materialize in an accident if necessary. you do not act quickly. Having a realtime ventilation monitoring and control system helps us as a tool to prevent a possible risk event. This control system, by constantly monitoring the ventilation inside the tunnel or inside the mine, can send us an alert to a web server that can be monitored through a computer and/or a smartphone that is on the surface when there is a lack of air, when the temperature rises considerably and the humidity begins to rise or the air flow is minimal then the system will activate an alert to the different monitoring or control devices. Additionally, this prototype contributes to saving energy because it will automate the switching on of the fans only in the presence of people in the work area. This prototype thus achieves real-time supervision and allows us to make the best decision when faced with an event that endangers human life in the workplace. Keywords—Temperature; esp-32; Arduino; air sensor, mine, ventilation, work safe - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Vegetation warming and greenness decline across Amazonia during the extreme drought of 2023(Multidisciplinary Digital Publishing Institute (MDPI), 2024-07-01)In 2023, most parts of the world experienced exceptional heat. In particular, anomalous warm temperatures and heatwave events were evidenced across South America during the second half of the year. The situation was particularly critical in the Amazon region in terms of not only hydrometeorological drought but also ecological and socioeconomic impacts. In this study, remote-sensing data collected from the Moderate Resolution Imaging Spectroradiometer (MODIS) were used to observe the changes in temperature and vegetation across Amazonia during the exceptional drought of 2023. This analysis was based on anomalies in the land surface temperature (LST) and vegetation indices: the enhanced vegetation index (EVI) and the normalized difference vegetation index (NDVI). The amplitude of the LST (AMP-LST), an indicator of the energy partitioning between the latent and sensible heat flux, and fire counts were also considered. The results show widespread and extreme warming across Amazonia during the austral spring in 2023, accompanied by a decline in vegetation greenness, water stress conditions across northern Amazonia, and an enhanced fire occurrence across central and northern Amazonia. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Direct Mosquito Feedings on Dengue-2 Virus-Infected People Reveal Dynamics of Human Infectiousness(Public Library of Science, 2023-09-01)Dengue virus (DENV) transmission from humans to mosquitoes is a poorly documented, but critical component of DENV epidemiology. Magnitude of viremia is the primary determinant of successful human-to-mosquito DENV transmission. People with the same level of viremia, however, can vary in their infectiousness to mosquitoes as a function of other factors that remain to be elucidated. Here, we report on a field-based study in the city of Iquitos, Peru, where we conducted direct mosquito feedings on people naturally infected with DENV and that experienced mild illness. We also enrolled people naturally infected with Zika virus (ZIKV) after the introduction of ZIKV in Iquitos during the study period. Of the 54 study participants involved in direct mosquito feedings, 43 were infected with DENV-2, two with DENV3, and nine with ZIKV. Our analysis excluded participants whose viremia was detectable at enrollment but undetectable at the time of mosquito feeding, which was the case for all participants with DENV-3 and ZIKV infections. We analyzed the probability of onward transmission during 50 feeding events involving 27 participants infected with DENV-2 based on the presence of infectious virus in mosquito saliva 7–16 days post blood meal. Transmission probability was positively associated with the level of viremia and duration of extrinsic incubation in the mosquito. In addition, transmission probability was influenced by the day of illness in a non-monotonic fashion; i.e., transmission probability increased until 2 days after symptom onset and decreased thereafter. We conclude that mildly ill DENV-infected humans with similar levels of viremia during the first two days after symptom onset will be most infectious to mosquitoes on the second day of their illness. Quantifying variation within and between people in their contribution to DENV transmission is essential to better understand the biological determinants of human infectiousness, parametrize epidemiological models, and improve disease surveillance and prevention strategies. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Radon emissions as indicators of changes in tropical Andean ecosystems emerging after glacial retreat under climate forcing(Springer Science+Business Media, 2026-03-01)This study examines radon emissions as potential proxies for environmental change in tropical Andean ecosystems undergoing rapid glacier retreat due to climate forcing. The research was conducted in the proglacial zone of the Yana Ucsha glacier in the Peruvian Andes, where field campaigns between July and November 2023 yielded radon measurements at approximately 28-day intervals across ten monitoring sites (M1–M10). Radon flux was measured using LR115 detectors and complemented by analyses of soil texture and the topographic wetness index (TWI) to assess the influence of environmental variables. Results demonstrate that radon emissions are strongly modulated by soil moisture, which in turn is regulated by regional air temperature and glacier runoff. A significant inverse relationship was identified between radon exhalation and regional air temperature, indicating that warmer periods suppress radon release due to increased soil moisture from enhanced glacier melt. Conversely, the coldest monitoring interval (second period) exhibited markedly higher radon exhalation, reaching up to 0.45 and 0.32 Bq m−2 h−1 at sites M1 and M4, respectively—approximately four to five times greater than the baseline range (0–0.10 Bq m−2h−1) observed during other periods. This pronounced temporal anomaly coincided with lower regional air temperatures, reduced glacier runoff, and drier soil conditions, highlighting strong climatic control on radon emissions. These findings suggest that ongoing glacier retreat and climate change may constrain or reduce radon emission rates in Andean proglacial environments, with important implications for environmental monitoring and ecosystem dynamics. Overall, this study provides novel insights into the interactions among cryospheric, atmospheric, and radon dynamics in the tropical Andes.1