Pedro camargo - Academia.edu (original) (raw)

Papers by Pedro camargo

Dalton Transactions

Controlling the nanoparticle morphology enables multimetallic nanorattles to achieve an increase ... more Controlling the nanoparticle morphology enables multimetallic nanorattles to achieve an increase of 152-fold in the peroxidase-like activity relative to Au nanoparticles.

Ciências Sociais Aplicadas em Revista

Com base nos crimes corporativos da Samarco, BHP Billiton e Vale, ocorridos em Mariana/MG (2015) ... more Com base nos crimes corporativos da Samarco, BHP Billiton e Vale, ocorridos em Mariana/MG (2015) e Brumadinho/MG (2019), é que se propõe o presente artigo, pensando os impactos da mineração por meio dos riscos de rompimento de barragens de rejeitos. Para isso nos munimos de duas perspectivas temporais (curto prazo e devir), e suas influências nos ecossistemas, empresas, economias e sociedade. Como resultado foi estruturado um ensaio teórico que se torna possível observar dois modelos analíticos, capazes de apresentar reflexões no mínimo, pertinentes ao atual modelo mineral. Com base nos impactos minerais, tendo como modelo a econômica ecológica, evidenciando como o princípio da entropia transforma a atividade mineral em uma ação de grande impacto ambiental, no presente e futuro, dado a segunda lei da termodinâmica. Como conclusão, podemos dizer que estudos e modelos desse tipo devem ser incentivados, afinal a reflexão que seus resultados trazem acerca das ações antrópicas do cotidi...

Revista de Ciência e Inovação, 2021

A gestão dos recursos naturais de maneira responsável é, sem dúvida, um dos maiores desafiosde ge... more A gestão dos recursos naturais de maneira responsável é, sem dúvida, um dos maiores desafiosde gestão ambiental. Para isso, técnicas de sensoriamento remoto têm sido cada vez mais usadasobjetivando um melhor e maior auxílio à decisão. Na margem Noroeste (B) do município de SãoFrancisco, Norte de Minas Gerais, localizado na bacia alto-média do rio São Francisco e onde oCerrado natural sofreu intensa degradação no intervalo de 41 anos (1975-2016), realizou-se opresente estudo, objetivando, através da metodologia de sobreposição de imagens cartográficas,utilizando-se a ferramenta IDW do software Arcgis 10.2, gerar um mapa capaz de apresentara média populacional da Periquiteira (Trema micrantha) por ponto de coleta. Pode-se concluir,após a exitosa experiência metodológica aqui presente, que o mapeamento sobreposto realizadoapresenta a Periquiteira (Trema micrantha) presente, basicamente, nos extremos Leste, Oeste,Sudeste e Sudoeste da área de estudo. Comparando-se o mapa gerado com a ca...

Kindlers Literatur Lexikon (KLL), 2020

Revista Geográfica Acadêmica, Jul 13, 2021

Responsible management of natural resources is one of the greatest challenges in environmental ma... more Responsible management of natural resources is one of the greatest challenges in environmental management. For this, remote sensing techniques have been increasingly used aiming at a better and greater decision aid. On the Northwest bank of the municipality of São Francisco, North of Minas Gerais, located in the upper-middle basin of the São Francisco River and where the natural Cerrado has suffered intense degradation in the last 45 years, the present study was carried out, aiming, through the overlay methodology of cartographic images, using the IDW tool of the ArcGis 10.2 software, generate a single map capable of showing the population average of 20 different plant species of ecological-economic interest per collection point. It can be concluded, after the methodological experience that the arboreal specimens that present the greatest potential for sustainable use from the regional ecological-economic point of view, are Pequi (Caryocar brasiliense), Cagaita (Eugenia dysenterica), Favela (Dimorphandra mollis), Monkey Pepper (Xylopia aromatica) and Umbu (Spondias tuberosa).

Changes Version 0.1.2 (2021-06-28) We closed a total of 2 issues (enhancements and bug fixes) thr... more Changes Version 0.1.2 (2021-06-28) We closed a total of 2 issues (enhancements and bug fixes) through 1 pull requests, since our last release on 2021-06-28. Issues Closed prep for release of version 0.1.2 (#180) Pull Requests prep for release of version 0.1.2 (#180) The following individuals contributed to this release:

Chemical Communications, 2022

Recent efforts on the use of controlled metal nanoparticles to establish structure–performance re... more Recent efforts on the use of controlled metal nanoparticles to establish structure–performance relationships in plasmonic catalysis are discussed.

Chemical Communications, 2020

A new tandem approach combines XRD and XANES for time-resolved in situ monitoring of the mechanoc... more A new tandem approach combines XRD and XANES for time-resolved in situ monitoring of the mechanochemical synthesis of gold nanoparticles.

Transportation Research Record: Journal of the Transportation Research Board, 2020

The increasing effect of Transport Network Companies (TNCs) in major US cities, allied to the exp... more The increasing effect of Transport Network Companies (TNCs) in major US cities, allied to the expectation that connected and autonomous vehicles (CAVs) will become the prevailing type of automobile on the streets in the coming decades, requires such a trend to be reflected in our forecasting models. Yet, most of the efforts undertaken in the United States and elsewhere are largely focused on understanding the demand for such types of transportation and have left aside the analysis of crucial differences in envisaged systems, such as pooled versus single-occupancy vehicles, use of CAVs as access modes to mass transit, and the cost corresponding to different levels of service in citywide systems. In this paper we introduce a new algorithm for modeling pooled CAVs and a framework for integrating this into traditional forecasting models. We also present the preliminary results of an application of the proposed methodology to the metropolitan region of Vancouver, British Columbia. The re...

The availability of large sensor-generated transportation datasets has increased rapidly in many ... more The availability of large sensor-generated transportation datasets has increased rapidly in many parts of the world, but it has not yet been fully leveraged by transportation modellers in the USA, Australia and elsewhere. Further, the low quantity and quality of data available for freight transportation planning model development requires modellers to extract as much information as possible from every dataset. On a different note, the general public and decision makers have been increasingly demanding of well-crafted visual depictions of data and model results, especially for GIS-enabled data, but such demand requires outputs of data processing that are not standard in the transportation/freight modelling practice. While GPS data from vehicles has the potential to provide a wealth of data for route choice behaviours, cross-validation of traditional vehicle classification counts, and vehicle movement animations, these areas have yet to be fully explored. In the case of freight modelling, the absence of sufficient data to support modelling makes it even more pressing to extract all possible information from datasets for freight-carrying vehicles. This means moving beyond the use of truck GPS data for simple travel time and speed measurements but rather developing methods to extract highly detailed truck activity data depicting route selection, trip chaining, and stop clusters, for instance. Before these detailed analyses for passenger or freight GPS data are possible, it is necessary to first reconstruct the vehicle routes based on their GPS data. This paper presents an algorithm for route reconstruction leveraging solely open source software, and presents a test case based on bus GPS data for a European city, as currently no truck GPS data is freely available for research purposes. The steps necessary for applying this algorithm to proprietary vehicle GPS data are also presented. OBJECTIVES AND MOTIVATIONS The last decade has seen a rapid increase in the availability of large transportation datasets generated by a variety of sensors such as Global Position Systems (GPS), cell phones, and in-pavement and roadside sensors. This robust data, however, has not been fully leveraged for development of either passenger or freight transportation planning models. Rather, these valuable data sets have seen limited use in transportation planning models as sources of network travel time information or more generally for national level performance measurement programs. In parallel, the quantity and quality of data available for freight transportation planning model development pales in comparison to what is routinely collected for developing passenger transportation models. This is due in part to privacy concerns across most industry sectors, which limits the type and level of detail of data made available. Also, unlike passenger travel, freight movements are the result of complex global supply chains and economic conditions which widen the scope of data needed to accurately model freight movements. Thus, it becomes more pressing to extract all possible information from the datasets that are currently available for freight-carrying vehicles. This means moving beyond the use of advanced datasets for simple travel time and speed measurements and instead developing methods to extract highly detailed truck activity data depicting route selection, trip chaining, stop clusters, and other trip characteristics.

Revista Semiárido De Visu, 2021

A gestão dos recursos naturais de maneira responsável é, sem dúvida, um dos maiores desafios de g... more A gestão dos recursos naturais de maneira responsável é, sem dúvida, um dos maiores desafios de gestão ambiental. Para isso, técnicas de sensoriamento remoto têm sido cada vez mais usadas objetivando um melhor e maior auxílio à decisão. Na margem Noroeste (B) do município de São Francisco, Norte de Minas Gerais, localizado na bacia alto-média do rio São Francisco e onde o Cerrado natural sofreu intensa degradação no intervalo de 41 anos (1975-2016), realizou-se o presente estudo, objetivando, através da metodologia de sobreposição de imagens cartográficas, utilizando-se a ferramenta IDW do software Arcgis 10.2 gerar um mapa capaz de apresentar a média populacional do Jequitibá Branco (Cariniana estrellensis) por ponto de coleta. Pode-se concluir, após a exitosa experiência metodológica aqui presente, que o mapeamento sobreposto aqui realizado apresenta essa espécie com uma alta quantidade de indivíduos, ocorrendo, em especial nas regiões Norte e Sul. Comparando-se com o mapa gerado ...

Increase in congestion in all major Australian cities and a perceived expansion of the peak perio... more Increase in congestion in all major Australian cities and a perceived expansion of the peak periods has suggested that peak-spreading is already happening in those cities. This paper summarizes an effort to demonstrate that this effect is a reality in Australia and a modelling framework to augment a traditional 4-step model with a departure time choice subcomponent. Model estimation and validation results are also presented.

International institutions have highlighted the necessity to generate knowledge about urban biodi... more International institutions have highlighted the necessity to generate knowledge about urban biodiversity, their ecological interactions and the effects of climate change. However, these knowledge remains unknown for the majority of cities around the world. The aim of this study was to determine what information has been produced in relation to climate and urban biodiversity nationally and internationally. We conducted a literature search using Scopus and databases of national universities and research institutes. We found 725 publications internationally and 115 publications in Colombia. We found an increase in the number of publications regarding urban biodiversity in the last 20 years. Internationally, most studies were conducted in Europe and 86 % of the publications focused on the study of plants in green areas and urban forests. In Colombia, almost half of the publications compiled were undergraduate theses and in general 45 % of publications focused on characterizations of spe...

Managing natural resources responsibly is undoubtedly one of the greatest environmental managemen... more Managing natural resources responsibly is undoubtedly one of the greatest environmental management challenges. Therefore, remote sensing techniques have been increasingly used aiming at better and greater decision making. The present study was carried out in the northwestern (B) portion of the municipality of Sao Francisco, Northern state of Minas Gerais, Brazil, located in the upper-middle basin of the Sao Francisco River and where natural Cerrado suffered severe degradation over a 41-year interval (1975-2016). The objective of the study was, through the methodology of cartographic image overlap, by using the IDW tool of ArcGIS 10.2 software, to generate a map capable of presenting the population average of the baruzeiro ( Dipteryx alata ) by collection point. It can be concluded, from the successful methodological experience presented herein, that baruzeiro tree specimens, if used sustainably, can contribute to local development given their commercial potential. Their responsible ...

Gold (Au) nanoparticles are known to be highly active towards a wide variety of heterogeneous cat... more Gold (Au) nanoparticles are known to be highly active towards a wide variety of heterogeneous catalytic transformations, including oxidation, reduction, C-C coupling reactions, and others.1 Among these transformations, silane oxidations are especially attractive as silanols are a key element in the production of silicon-containing materials.2 However, conventional routes for the silane oxidation generally require the presence of strong and toxic oxidants such as permanganate and dichromate.2 Here, we demonstrate that high catalytic performances (TOF = 590000 h-1) could be achieved towards the green oxidation of silanes and H2 production under ultralow Au loadings (0.001 – 0.0002 mol % in terms of Au) employing H2O as the oxidant, 25 oC as the reaction temperature, and MnO2 nanowires decorated with ultrasmall Au NPs (having diameters of 3 nm or less) as catalysts.

Microscopy and Microanalysis, 2021

Further improvements and mechanistic understanding of the electrocatalytic enhancements towards t... more Further improvements and mechanistic understanding of the electrocatalytic enhancements towards the oxygen reduction reaction (ORR) are required to meet cost/energy demands and thus enable their practical applications in polymer electrolyte fuel cells. An investigation of the electrocatalytic enhancement mechanisms and stability of controlled electrocatalysts comprised Pt nanoparticles supported on TiO2/C materials was herein performed. The catalysts were prepared by depositing Pt, over the surface of TiO2 colloidal spheres. These materials were then supported onto Vulcan carbon to produce Pt/TiO2/C. The effect of Pt coverage at the TiO2 surface as well as the Pt/TiO2 loading on carbon over their ORR activity and stability were investigated. Results indicate that the control over Pt coverage at the surface played a pivotal role on activity optimization, in which an association between Pt content at the TiO2 surface and ORR activity was established. The ORR activity and stability wer...

ChemCatChem, 2021

Designing efficient anode CO-tolerant electrocatalysts is critical in low-temperature fuel cell c... more Designing efficient anode CO-tolerant electrocatalysts is critical in low-temperature fuel cell catalysts fueled either by H 2 /CO or alcohol. We demonstrate that the incorporation of TiO 2 nanocubes (TiO 2 NCs) on Carbon Vulcan supports, followed by the synthesis of Pt NPs at their surface (Pt/TiO 2 NCs-C material), led to improvements in performance towards the electrooxidation of carbon monoxide, ethanol, methanol, ethylene glycol, and glycerol in acidic media relative to the commercial Pt/C and Pt/ TiO 2-C counterparts employing commercial TiO 2. The nanocubes enabled changes in the electronic properties of Pt NPs while contributing to the bifunctional mechanism as compared to Pt/ C and Pt/TiO 2-C with commercial TiO 2. Fuel cell experiments fed with H 2 /CO steam showed that Pt/TiO 2 NCs-C employing nanocubes was resistant to CO-poisoning, yielding superior performance in operational conditions. The results reported herein have important implications for developing electrocatalysts with superior performances in PEMFCs.