Gestão Integrada de Águas Pluviais em Conjunto Habitacional Multifamiliar: Experimento Casa Nordeste 1.0

The increasing demand for water supply in large urban centers is destabilizing the hydric network connected to them. In this scenario, rainwater shows itself as a valid alternative source to supply the needs of this good. However, these alternative systems are proving difficult to implement, considering the current vertical density. The objective of this work was to analyze at a projectual level the operational, social and economic viability of an integrated rainwater reuse management model in the context of an evolving multifamily housing complex, composed of technologies previously developed by researchers and applied in the experiment CASA NORDESTE 1.0. As a result, the integrated system allows the optimization of the technologies in harmony with the building structure, saving of R$163.00 per month, considering a usable volume of 42,6 m³/month, then reducing local economic demands, allocation and energy. Finally, the project presents the potential viability in metropolis with problems of population density, urban drainage and water stress, besides presenting an evolutionary dynamics that can be expanded or suppressed according to the demand.A crescente demanda por água nos grandes centros urbanos vem ocasionando situações de estresse hídrico nas redes conectadas a eles. Nesse cenário, a água pluvial se mostra uma fonte alternativa válida para suprir as necessidades deste bem. Entretanto, as alternativas vêm se mostrando de difícil implementação, levando-se em consideração o adensamento vertical atual. Dito isso, este trabalho teve como objetivo analisar, a nível projetual, a viabilidade operacional, social e econômica de um modelo de gestão integrada de reuso de águas pluviais no contexto de conjunto de habitação multifamiliar evolutivo, composto por tecnologias desenvolvidas previamente por pesquisadores e aplicadas no experimento CASA NORDESTE 1.0. Como resultado, o sistema integrado permite a otimização das tecnologias, em harmonia com a estrutura do edifício, com uma economia de R$ 163,00 reais mensais, considerando um volume aproveitável de 42,6 m3/mês, reduzindo demandas locais econômicas, de alocação e energéticas. Por fim, o projeto apresenta potencial de viabilidade em metrópoles com problemas de adensamento populacional, drenagem urbana e estresse hídrico, além de apresentar uma dinâmica evolutiva podendo ser expandido ou suprimido de acordo com a demanda

Improved photocatalytic activity of d-FeOOH by using H2O2 as an electron acceptor.

In this work, d-FeOOH nanoparticles were synthesized by a simple co-precipitation method and used as a photocatalyst in the presence of H2O2 for the oxidation of Rhodamine B (RhB) dye under artificial light. The d-FeOOH was characterized by powder X-ray diffraction, 57Fe M?ssbauer spectroscopy, N2 adsorption/desorption and UV?vis diffuse reflectance measurements. The d-FeOOH nanoparticles have high specific surface area (101 m2 g 1) and optical bandgap energy of 2.02 eV. Under artificial light, only 59% of RhB (100 mL; 20 mg L 1) was photocatalytically degraded by d-FeOOH in 60 min reaction. However, after adding H2O2, the photocatalytic activity of d-FeOOH was significantly improved, reaching 87% of dye removal. Tests using scavengers of reactive species and EPR analysis revealed that h+ and OH are the main species in this system. Based on the experimental results, the mechanism of RhB photodegradation in the presence of d-FeOOH and H2O2 was proposed. By this mechanism, the OH can be formed by direct water oxidation or by H2O2 reduction, as the electron transfer from the conduction band of d-FeOOH to H2O2 is thermodynamically favorable. Moreover, the H2O2 retards the electron-hole recombination in d-FeOOH, thus increasing its photocatalytic activity. Given its high efficiency for degrading RhB in water, d-FeOOH revealed to be a promising photocatalyst to be tested in the oxidation of emerging pollutants for the environmental decontamination

Processo qu?mico de oxida??o do grafite para obten??o de ?xido de grafite, ?xido de grafeno e grafeno: uso do sistema Fenton como oxidante

Grafite foi oxidado pelo sistema Fenton (uma mistura de Fe2 eH202) para produzir ?xido de grafite. Este sistema ? ambientalmente mais favor?vel que os sistemas convencionais existentes, devido a rea??o de Fenton ocorrer ? temperatura ambiente e press?o atmosf?rica, como tamb?m por n?o haver libera??o de gases durante o processo de oxida??o do grafite. Uma vez formado o ?xido de grafite por este m?todo verde, a esfolia??o do mesmo em ultrassom de banho leva ? forma??o de ?xido de grafeno que pode posteriormente ser reduzido atrav?s de um agente redutor, para ent?o formar o grafeno, um material que tem ampla aplica??o em nanoeletr?nica, sensores,supercapacitores e cat?lise. O m?todo de oxida??o de grafite descrito aqui pode ser aplicado em qualquer processo qu?mico de produ??o de ?xido de grafite, ?xido de grafeno ou grafeno

Enhanced photocatalytic hydrogen generation from water by Ni(OH)2 loaded on Ni-doped d-FeOOH nanoparticles obtained by one-step synthesis.

Ni(OH)2 loaded on Ni-doped d-FeOOH photocatalysts were prepared by a simple and low-cost one-step precipitation method. The effect of Ni(OH)2 nanoparticles and Ni2+ doping on the photocatalytic hydrogen production rates by d-FeOOH in aqueous suspension was investigated. The results showed that the photocatalytic H2-production activity of d-FeOOH was significantly enhanced by doping with Ni2+ ions and by loading Ni(OH)2 on its surface. The maximum H2-production was obtained for the sample with 20 wt% Ni, which provided 5746 mmol h 1 g 1. This high photocatalytic H2-production is due to the combined effects of Ni2+ doping and Ni(OH)2 loaded on the d-FeOOH surface. The Ni2+ doping increased the conductivity and charge transfer in d-FeOOH, whereas the Ni(OH)2 improved the charge separation in the d-FeOOH and, consequently, the photocatalytic H2-production activity

Performance of a modular ton-scale pixel-readout liquid argon time projection chamber

The Module-0 Demonstrator is a single-phase 600 kg liquid argon time projection chamber operated as a prototype for the DUNE liquid argon near detector. Based on the ArgonCube design concept, Module-0 features a novel 80k-channel pixelated charge readout and advanced high-coverage photon detection system. In this paper, we present an analysis of an eight-day data set consisting of 25 million cosmic ray events collected in the spring of 2021. We use this sample to demonstrate the imaging performance of the charge and light readout systems as well as the signal correlations between the two. We also report argon purity and detector uniformity measurements, and provide comparisons to detector simulations

Supernova Pointing Capabilities of DUNE

International audienceThe determination of the direction of a stellar core collapse via its neutrino emission is crucial for the identification of the progenitor for a multimessenger follow-up. A highly effective method of reconstructing supernova directions within the Deep Underground Neutrino Experiment (DUNE) is introduced. The supernova neutrino pointing resolution is studied by simulating and reconstructing electron-neutrino charged-current absorption on $^{40}$Ar and elastic scattering of neutrinos on electrons. Procedures to reconstruct individual interactions, including a newly developed technique called ``brems flipping'', as well as the burst direction from an ensemble of interactions are described. Performance of the burst direction reconstruction is evaluated for supernovae happening at a distance of 10 kpc for a specific supernova burst flux model. The pointing resolution is found to be 3.4 degrees at 68% coverage for a perfect interaction-channel classification and a fiducial mass of 40 kton, and 6.6 degrees for a 10 kton fiducial mass respectively. Assuming a 4% rate of charged-current interactions being misidentified as elastic scattering, DUNE's burst pointing resolution is found to be 4.3 degrees (8.7 degrees) at 68% coverage

Performance of a modular ton-scale pixel-readout liquid argon time projection chamber

International audienceThe Module-0 Demonstrator is a single-phase 600 kg liquid argon time projection chamber operated as a prototype for the DUNE liquid argon near detector. Based on the ArgonCube design concept, Module-0 features a novel 80k-channel pixelated charge readout and advanced high-coverage photon detection system. In this paper, we present an analysis of an eight-day data set consisting of 25 million cosmic ray events collected in the spring of 2021. We use this sample to demonstrate the imaging performance of the charge and light readout systems as well as the signal correlations between the two. We also report argon purity and detector uniformity measurements, and provide comparisons to detector simulations

Performance of a modular ton-scale pixel-readout liquid argon time projection chamber

International audienceThe Module-0 Demonstrator is a single-phase 600 kg liquid argon time projection chamber operated as a prototype for the DUNE liquid argon near detector. Based on the ArgonCube design concept, Module-0 features a novel 80k-channel pixelated charge readout and advanced high-coverage photon detection system. In this paper, we present an analysis of an eight-day data set consisting of 25 million cosmic ray events collected in the spring of 2021. We use this sample to demonstrate the imaging performance of the charge and light readout systems as well as the signal correlations between the two. We also report argon purity and detector uniformity measurements, and provide comparisons to detector simulations

Performance of a modular ton-scale pixel-readout liquid argon time projection chamber

International audienceThe Module-0 Demonstrator is a single-phase 600 kg liquid argon time projection chamber operated as a prototype for the DUNE liquid argon near detector. Based on the ArgonCube design concept, Module-0 features a novel 80k-channel pixelated charge readout and advanced high-coverage photon detection system. In this paper, we present an analysis of an eight-day data set consisting of 25 million cosmic ray events collected in the spring of 2021. We use this sample to demonstrate the imaging performance of the charge and light readout systems as well as the signal correlations between the two. We also report argon purity and detector uniformity measurements, and provide comparisons to detector simulations