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The influence of diethylaniline and toluene on the streamer propagation in cyclohexane between a point-plane gap under positive impulse voltage stress.

Liquid insulation is used in high voltage equipment such as power transformers as both dielectric medium and coolant. Breakdown in liquid insulation tends to be governed either by streamer initiation under more uniform fields, or by streamer propagation under more non-uniform fields. A model streame...
  • por Portal Padrão
  • publicado
  • 03/08/2022
  • 6:57 PM

Giving voice to the voiceless: connecting graduate students with high school students by incubating DRR plans through participatory mapping.

Purpose: The purpose of this study is to encourage graduate students to facilitate a participatory mapping activity with high school students, to have their voices heard in the disaster risk reduction (DRR) agenda. Design/methodology/approach: A participatory mapping, youth-led session, was conducte...
  • por Portal Padrão
  • publicado
  • 03/08/2022
  • 6:56 PM

Flood risk governance in Brazil and the UK: facilitating knowledge exchange through research gaps and the potential of citizen-generated data

Purpose The study aims to identify the gaps and the potentialities of citizen-generated data in four axes of warning system: (1) risk knowledge, (2) flood forecasting and monitoring, (3) risk communication and (4) flood risk governance. Design/methodology/approach Research inputs for this work were ...
  • por Portal Padrão
  • publicado
  • 03/08/2022
  • 6:54 PM

Importance of including soil moisture in drought monitoring over the Brazilian semiarid region: an evaluation using the JULES model, in situ observations, and remote sensing.

Soil moisture information is essential to monitoring of the intensity of droughts,the start of the rainy season, planting dates and early warnings of yield losses.We assess spatial and temporal trends of drought over the Brazilian semiaridregion by combining soil moisture observations from 360 stati...
  • por Portal Padrão
  • publicado
  • 07/07/2022
  • 3:53 PM

Avaliação de um processo de coprodução de conhecimento e engajamento de atores a partir de ferramentas da Educação Ambiental: práxis e ciência cidadã.

Este artigo apresenta uma análise sobre o processo formativo de um grupo de atores interessados na temática da Gestão dos Recursos Hídricos no estado de São Paulo, em especial, na Bacia do Paraíba do Sul. Tem como conceitos orientadores a pedagogia da práxise a ciência cidadã. A metodologia...
  • por Portal Padrão
  • publicado
  • 07/07/2022
  • 3:51 PM

Impacts of land use and land cover changes on hydrological processes and sediment yield determined using the SWAT model.

Land use and land cover (LULC) changes strongly affect local hydrology and sediment yields. The current study focused on a basin in the Brazilian Amazon and had the following three objectives: (1) to perform an effective diagnosis of flow and sediment yield, (2) to evaluate the impacts of LULC chang...
  • por Portal Padrão
  • publicado
  • 01/06/2022
  • 4:35 PM

Characteristics of lightning-caused wildfires in central Brazil in relation to cloud-ground and dry lightning

Lightning ignition is the major cause of natural wildfires in several regions worldwide. Determining if wildfires in remote uncontrolled areas result from natural lightning as opposed to anthropic action is a relevant and yet-unsolved challenge for large regions of the planet, with scientific and ma...
  • por Portal Padrão
  • publicado
  • 01/06/2022
  • 4:33 PM

Environmental vulnerability assessment of Brazilian Amazon Indigenous lands.

Amazonian Indigenous Lands (ILs) are human-environment systems facing a multitude of environmental threats. Yet, the resulting vulnerability of these systems are to date unknown. We adopt the theoretical vulnerability framework of the IPCC to assess the environmental vulnerability of Brazilian Amazo...
  • por Portal Padrão
  • publicado
  • 01/06/2022
  • 4:31 PM

Evaluating the performance of radiometers for solar overirradiance events.

This paper describes a methodology used to evaluate pyranometers and reference cell performance in relation to solar overirradiance (OIR) events. By definition, these events are characterized when global horizontal irradiance (GHI) exceeds the extraterrestrial horizontal irradiance (ETH) due to clou...
  • por Portal Padrão
  • publicado
  • 01/06/2022
  • 4:29 PM

Brazilian biomes distribution: past and future

The Last Glacial Maximum (LGM, 26.519 ka) was marked by atmospheric cooling, in contrast to the current warming climate, which will probably continue in the coming decades, according to climate models projections. The LGM to pre-industrial transition provides an opportunity to test the vegetation re...
  • por Portal Padrão
  • publicado
  • 01/06/2022
  • 4:27 PM

Climate change could reduce and spatially reconfigure cocoa cultivation in the Brazilian Amazon by 2050.

Cocoa is a plant with origins in northwestern South America with high relevance in the global economy. Evidence indicates that cocoa is sensitive to a dry climate, under which crop production is reduced. Projections for future climate change scenarios suggest a warmer and drier climate in the Amazon...
  • por Portal Padrão
  • publicado
  • 01/06/2022
  • 4:25 PM

Multitemporal spatial analysis of land use and land cover changes in the lower Jaguaribe Hydrographic sub-basin, Ceará, Northeast Brazil.

Aquaculture is currently one of the fastest growing food production systems globally, and shrimp is considered one of the most highly valued products. Our study area is the lower Jaguaribe River sub-basin (LJRSB), located in the northeastern part of Ceará in Brazil. The aquaculture activity in this...
  • por Portal Padrão
  • publicado
  • 01/06/2022
  • 4:23 PM