4,181 research outputs found
Fractional statistical dynamics and fractional kinetics
We apply the subordination principle to construct kinetic fractional
statistical dynamics in the continuum in terms of solutions to Vlasov-type
hierarchies. As a by-product we obtain the evolution of the density of
particles in the fractional kinetics in terms of a non-linear Vlasov-type
kinetic equation. As an application we study the intermittency of the
fractional mesoscopic dynamics.Comment: Published in Methods of Functional Analysis and Topology (MFAT),
available at http://mfat.imath.kiev.ua/article/?id=890. arXiv admin note:
text overlap with arXiv:1604.0380
Synthesis of carbon nanostructures by chemical vapour deposition over Ni-Al co-oxides using plastic solid waste as precursor
Europe contributed with 18.5% of the almost 3!50 Mton of plastics produced worldwide in 2017.
Polypropylene (PP) and light and heavy density polyethylene (LOPE and HOPE, respectively)
represents near 49.1% of the plastics produced in Europe. Packaging is the main application of these
plastics, so typically they have one-single use. In 2014, 25.8 Mton of post-consumer plastic solid wastes
(PSWs) ended up in the official waste streams (54.0% of the demanded quantity), 69.2% being
recovered through recycling (7.7 Mton) and enen~y recovery processes (10.2 Mton), the remaining
30.8% sent to landfill [1]. Concerns about usage and disposal are diverse and include accumulation of
PSWs in landfills and in natural habitats, physic;al problems for wildlife resulting from ingestion or
entanglement in plastic and the leaching of chemicals from plastic products [2]. The incineration of
PSWs contributes to pollution due to harmful and tC»xic emissions and both incineration and mechanical
recycling are costly and may or may not be economically viable in different situations [3]. More attractive
strategies are the production of carbon nanomate!rials using PSWs as carbon precursors [4]. In this
work, Ni-AI eo-oxide nanoparticles were synthesiz,ed by eo-precipitation and employed as catalysts in
the chemical vapour deposition of CNTs when using LOPE as carbon precursor and as model
compound of plastic solid waste. Fig. 1 shows the scanning electron micrographs of the carbon
nanostructures prepared at 1000 °C during 1 h in a tubular furnace under 10 NmL·min·1 nitrogen flow.
As can be observed, CNTs and carbon nanospheres were produced.This work is a result of Project "PLASTIC_TO_FUEL&IMATs - Upcycling Waste Plastics into Fuel and Carbon
Nanomaterials", with the reference POCI-01-0145-FEDER-031439, through the Competitiveness and
Internationalization Operational Program. supported by the European Regional Development Fund (ERDF); the
Associate Laboratory LSRE-LCM- UID/EQU/50020/2019 - funded by national funds through FCT/MCTES (PIDDAC);
and CIMO UID/AGR/00690/2019 through FEDER under Program PT2020.info:eu-repo/semantics/publishedVersio
CARACTERIZAÇÃO DOS RECURSOS HÍDRICOS SUBTERRÂNEOS NO MUNICÍPIO DE SANTA ROSA - RS
A água é um recurso natural essencial à vida, por isso se faz necessário que se haja um conhecimento amplo sobre sua quantidade e qualidade. Este trabalho apresenta uma análise das águas subterrâneas no município de Santa Rosa localizado no estado do Rio Grande do Sul. Tendo como objetivo principal caracterizar os recursos hídricos subterrâneos do município através de uma espacialização cartográfica, realizar uma avaliação das características físico-químicas e hidrodinâmicas das águas subterrâneas, e cadastrar os poços tubulares na área urbana e rural. Para tanto, utilizou-se para a execução do estudo, dados pré-existentes na página eletrônica do Sistema de Informações de Águas Subterrâneas (SIAGAS), na Prefeitura Municipal de Santa Rosa, e em empresas de perfuração de poços, realizou-se também pesquisa de campo com o uso do “Global Position System” (GPS) e técnicas computacionais. Para caracterizar as águas subterrâneas, fez-se a análise de parâmetros físico-químicos em amostras coletadas em campo. Como resultado mais relevante desta pesquisa tem-se o cadastro dos poços tubulares para um possível monitoramento e a geração de diversos mapas indicando a espacialização da qualidade da água. Desta forma, esse estudo contribuirá para o planejamento adequado do município de Santa Rosa-RS trazendo subsídios aos órgãos gestores e à sociedade.Water is a natural resource essential to life, so it is necessary that there is a broad knowledge about their quantity and quality. This paper presents an analysis of groundwater in the Santa Rosa state Southern Brazil. Its main goal is to characterize the groundwater resources of the municipality through a spatial map, conduct an assessment of the physico-chemical and hydrodynamic groundwater. Were registered their wells in urban and rural areas. Were used to carrying out the study, pre-existing data on the website of the Groundwater Information System (SIAGAS), the prefecture of City of Santa Rosa. Were executed contacts with the companies well drilling and was carried out also field research with the use of Global Position System (GPS) and computational techniques. To characterize the groundwater, was executed the analysis of physical and chemical parameters in samples collected in the field. As most relevant result of this research has been the registration the position wells for a possible monitoring and generation of several maps showing the spatial distribution of water quality. Thus, this study will contribute to the proper planning of the municipality of Santa Rosa bringing benefits to governing bodies and society
Systems chemo-biology analysis of DNA damage response and cell cycle effects induced by coal exposure
Cell cycle alterations are among the principle hallmarks of cancer. Consequently, the study of cell cycle regulators has emerged as an important topic in cancer research, particularly in relation to environmental exposure. Particulate matter and coal dust around coal mines have the potential to induce cell cycle alterations. Therefore, in the present study, we performed chemical analyses to identify the main compounds present in two mineral coal samples from Colombian mines and performed systems chemo-biology analysis to elucidate the interactions between these chemical compounds and proteins associated with the cell cycle. Our results highlight the role of oxidative stress generated by the exposure to the residues of coal extraction, such as major inorganic oxides (MIOs), inorganic elements (IEs) and polycyclic aromatic hydrocarbons (PAH) on DNA damage and alterations in the progression of the cell cycle (blockage and/or delay), as well as structural dysfunction in several proteins. In particular, IEs such as Cr, Ni, and S and PAHs such as benzo[a]pyrene may have influential roles in the regulation of the cell cycle through DNA damage and oxidative stress. In this process, cyclins, cyclin-dependent kinases, zinc finger proteins such as TP53, and protein kinases may play a central role
Self-intersection local times for multifractional Brownian motion in higher dimensions: A white noise approach
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