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Mostrando ítems 2297-2316 de 2397
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Ultrasound-assisted synthesis of polyacrylamide-grafted sodium alginate and its application in dye removal
(2018) [Artículo de periódico]A polymeric adsorbent based on sodium alginate (SAG) grafted with polyacrylamide (PAM) (SAG-g-PAM) was synthesized using an ultrasound-assisted method. The addition polymerization was carried out with ammonium persulfate ... -
Ultrastable phonon frequencies in α-quartz-type BPO4 at high temperature
(2019) [Artículo de periódico]The Raman modes of α-quartz-type boron phosphate were found to be extremely stable in frequency over a large temperature range from 300–1000 K. In order to determine the origin of this behavior, the material was also studied ... -
Uncertainty assessment in hydrodynamic modeling of floods generated by dam break
(2018) [Artículo de periódico]The objective of the present work was to evaluate sources of uncertainty in dam break simulations for areas with contrasting characteristics: one in a narrow valley with high slopes, and another an open valley with low ... -
Uncertainty in climate change impacts on water resources in the Rio Grande Basin, Brazil
(2011) [Artículo de periódico]We quantify uncertainty in the impacts of climate change on the discharge of Rio Grande, a major tributary of the Paraná River in South America and one of the most important basins in Brazil for water supply and hydro-electric ... -
Understanding industry 4.0 : definitions and insights from a cognitive map analysis
(2019) [Artículo de periódico]Goal: The purpose of this paper is to present an analysis of Industry 4.0 concepts and technologies through the lens of practitioners and scholars with considerable expertise in this field. Design / Methodology / Approach: ... -
Unidades fitofisionômicas em mesoescala no Pantanal Norte e suas relações com a geomorfologia
(2010) [Artículo de periódico]Este trabalho teve por objetivo caracterizar e quantificar as unidades fitofisionômicas em mesoescala e estabelecer suas relações com a intensidade e duração da inundação e com a topografia. O estudo foi realizado no Sítio ... -
Univer-cidade : considerações sobre o Campus do Vale da UFRGS na mobilidade urbana do bairro Santa Isabel, Viamão, RS
(2019) [Artículo de periódico]O presente artigo trata da expansão da mobilidade urbana a partir da implantação de Instituições de Ensino Superior (IES), cujo objetivo foi identificar a relação existente entre o bairro viamonense Santa Isabel e o Campus ... -
Unraveling the phase behavior, mechanical stability, and protein reconstitution properties of polymer-lipid hybrid vesicles
(2023) [Artículo de periódico]Hybrid vesicles consisting of natural phospholipids and synthetic amphiphilic copolymers have shown remarkable material properties and potential for biotechnology, combining the robustness of polymers with the biocompatibility ... -
Unveiling fungal community structure along different levels of anthropic disturbance in a South American subtropical lagoon
(2023) [Artículo de periódico]Studies of fungal communities through amplicon metagenomics in aquatic environments, particularly in freshwater ecosystems, are still relatively recent. Unfortunately, many of these water bodies are facing growing threats ... -
Urban parks with adjacent bike lanes: a factor in attracting cyclist users?
(2023) [Artículo de periódico]Usually, the research about urban parks, cyclists, and the cycling network are not evaluated together, nor are their interactions, resulting in a need to understand the correlations between these issues related to both ... -
Use of a griffith tube to evaluate the anaerobic sludge sedimentation in a UASB reactor treating an effluent with long-chain fatty acids
(2017) [Artículo de periódico]This paper proposes to study the sedimentation characteristics of anaerobic sludge, by determining the settling velocity of sludge granules with the Griffith Tube. This is a simple, low-cost method, suitable for use in ... -
Use of Different Kinds of Solutes Alternative to Sucrose in Osmotic Dehydration of Yacon
(2015) [Artículo de periódico]The present work aimed to evaluate glycerol, maltodextrin, polydextrose and sorbitol for the osmotic dehydration of yacon for diabetics, keeping its properties as prebiotic. Osmotic dehydration was carried out using a yacon ... -
Use of gravity separation in metals concentration from printed circuit board scraps
(2014) [Artículo de periódico]The amount of solid waste generated by all segments of society has increased in past decades. Annually, in Brazil, 96,000 tonnes of electronic scrap are generated from computers. The incorrect disposal of this waste creates ... -
Use of large-scale hydrological models to predict dam break-related impacts
(2020) [Artículo de periódico]In this research study, the MGB-IPH (acronym for Large Scale Model in Portuguese - Modelo de Grandes Bacias) was used to simulate the propagation of a dam breach hydrograph estimated from predictor equations for the Três ... -
Use of nanoscale zero-valent iron for remediation of clayey soil contaminated with hexavalent chromium : batch and column tests
(2020) [Artículo de periódico]This study investigated the reduction of hexavalent chromium (Cr(VI)) in a clayey residual soil using nanoscale zero-valent iron (nZVI). Five di erent ratios between nZVI and Cr(VI) were tested in batch tests (1000/11; ... -
Use of the swat model for hydro-sedimentologic simulation in a small rural watershed
(2012) [Artículo de periódico]Mathematical models have great potential to support land use planning, with the goal of improving water and land quality. Before using a model, however, the model must demonstrate that it can correctly simulate the ... -
Use of wollastonite as a flux for bone China bodies
(2012) [Artículo de periódico]The utilization of wollastonite as a flux in bone china was investigated in this work. Ceramic industry is always looking to optimize the use of fluxes as a way of reducing energy costs associated with firing. Wollastonite ... -
Using conducting polymers as active agents for marine antifouling paints
(2015) [Artículo de periódico]Antifouling coatings were prepared with paints containing polyaniline (PAni) and derivatives as active pigment, and evaluated by antifouling performance on metallic or polyvinyl chloride substrates. The paints, PAni and ... -
Using cost-volume-profit to analyse the viability of implementing a new distribution center
(2016) [Artículo de periódico]Firms are constantly improving their activities in order to become more competitive. With the diffusion of international competition and easier access to global markets, effective logistic and inventory management strategies ... -
Using genetic algorithms to accelerate automatic software generation for microprocessor functional testing
(2006) [Artículo de periódico]