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Abstract The residual circulation of the Ria de Muros, a large coastal embayment in NW Spain, are studied using a three-dimensional baroclinic finite-difference model. The driving forces considered by the model include the tide, winds, river inflows and density forcing at the open boundary. In situ data of current velocity and direction, water level, wind velocity and direction, river discharge, and temperature and salinity are used for model validation. Simulated and observed time series of water level and current velocity are in good agreement. Once validated, the model is applied to compute the residual circulation induced by the relevant agents of the ria hydrodynamics—the tide, an upwelling-favourable wind characteristic of spring and summer, a downwelling-favourable wind typical of winter, and freshwater inflows associated with high river runoff. The resulting residual circulation differ notably. The tide does not generate significant residual flows except in the inner ria. By contrast, winds and river discharges induce important residual flows throughout; in the middle and outer ria they generate a 3D residual circulation pattern which renders the conventional two-layer scheme of estuarine circulation too simplistic in this case. Thus, this first application of a 3D numerical model to the Ria de Muros sheds new light on its fundamental hydrodynamics.

Tire valorization by catalytic cracking of scrap tires pyrolysis oil has been investigated in a riser simulator reactor under fluid catalytic cracking (FCC) unit conditions using an equilibrated FC...

This book presents contributions on new technologies in building and construction. Buildings are complex elements that impact environment significantly. The sustainability of this sector requires a holistic and multidisciplinary approach that allows adequate strategies to be established to reduce its environmental impact. This heterogeneity is represented in these chapters, which have been developed by researchers from different countries. The book is divided into three sections: (i) analysis, (ii) design and modeling, and (iii) solutions. The book chapters together represent an advance in current knowledge about new technologies in building and construction, crucial for researchers, engineers, architects, policy makers, and stakeholders.

A one-pot, microwave-assisted protocol has been developed for the synthesis of 5,6-dihydroquinazolinones that incorporate structural fragments from chalcones, acetylacetoacetate, ammonium formate and formamide. This process generates two rings, two carbon–carbon and three carbon–nitrogen bonds and does not require the use of chromatographic purification. The dihydroquinazolinones were efficiently aromatized without the need for metal-based oxidants by a microwave-assisted halogenation–elimination sequence in the presence of N-bromosuccinimide, again in the absence of chromatographic purification.

A heuristic algorithm for solving the cluster problem is presented in this paper. The algorithm exploits both the contour tableau and the newly developed path concept, and does not require the choice of a starting node. Experimental results show that the method is competitive with other published algorithms as far as border size is concerned. Furthermore, resultant fill-in is kept small.

AbstractEthanol induces severe alterations in membrane trafficking in hepatocytes and astrocytes, the molecular basis of which is unclear. One of the main candidates is the cytoskeleton and the molecular components that regulate its organization and dynamics. Here, we examine the effect of chronic exposure to ethanol on the organization and dynamics of actin and microtubule cytoskeletons and glucose uptake in rat astrocytes. Ethanol‐treated cells cultured in either the presence or absence of fetal calf serum showed a significant increase in 2‐deoxyglucose uptake. Ethanol also caused alterations in actin organization, consisting of the dissolution of stress fibres and the appearance of circular filaments beneath the plasma membrane. When lysophosphatidic acid (LPA), which is a normal constituent of serum and a potent intercellular lipid mediator with growth factor and actin rearrangement activities, was added to ethanol‐treated astrocytes cultured without fetal calf serum, it induced the re‐appearance of actin stress fibres and the normalization of 2‐deoxyglucose uptake. Furthermore, ethanol also perturbed the microtubule dynamics, which delayed the recovery of the normal microtubule organization following removal of the microtubule‐disrupting agent nocodazole. Again, pre‐treatment with LPA prevented this alteration. Ethanol‐treated rodent fibroblast NIH3T3 cells that constitutively express an activated Rho mutant protein (GTP‐bound form) were insensitive to ethanol, as they showed no alteration either in actin stress‐fibre organization or in 2‐deoxyglucose uptake. We discuss the putative signalling targets by which ethanol could alter the cytoskeleton and hexose uptake and the cytoprotective effect of LPA against ethanol‐induced damages. The latter opens the possibility that LPA or a similar non‐hydrolysable lipid derivative could be used as a cytoprotective agent against the noxious effects of ethanol.

Abstract Decarbonizing world economies implies the deployment of “green technologies”, meaning a renovation of the energy sector towards using renewable sources and zero emission transport technologies. This renovation will require huge amounts of raw materials, some of them with high supply risks. To assess such risks a new methodology is proposed, identifying possible bottlenecks of future demand versus geological availability. This has been applied to the world development of wind power, solar photovoltaic, solar thermal power and passenger electric vehicles for the 2016–2050 time period under a business as usual scenario considering the impact on 31 different raw materials. As a result, 13 elements were identified to have very high or high risk, meaning that these could generate bottlenecks in the future: cadmium, chromium, cobalt, copper, gallium, indium, lithium, manganese, nickel, silver, tellurium, tin and zinc. Tellurium, which is mostly demanded to manufacture solar photovoltaic cells, presents the highest risk. To overcome these constraints, measures consisting on improving recycling rates from 0.1% to 4.6% per year could avoid material shortages or restrictions in green technologies. For instance, lithium recycling rate should increase from 1% to 4.8% in 2050. This study aims to serve as a guideline for developing eco-design and recycling strategies.

A Life Cycle Assessment (LCA) with focus on carbon footprint, followed by Life Cycle Costing (LCC) of municipal solid waste (MSW) management were conducted in a residential area of a medium-sized European city of 80,000 inhabitants. The initial results showed high environmental impacts and lack of economic sustainability, due to the high amounts of waste landfilled, the low extent of separate collection, low performance of mechanical-biological treatment as well as absence from alternatives to landfilling of non-recyclable materials. Taking this result as a baseline scenario, three improvement.s were tested with the aim of turning the carbon footprint of the local MSW management system into a neutral value: (i) increased separate collection of recyclables, (ii) enhanced biogas production and (iii) refuse-derived fuel (RDF) production. Successively adding the improvements, three alternative improved scenarios were defined, until reaching a negative carbon footprint, meaning that an optimised system would avoid GHG emissions. The proposed changes were sufficient to achieve carbon neutrality, as well as reduce overall environmental impacts, but were not enough for achieving economic sustainability due to the great influence of collection costs, especially for separate collection. It was concluded that by using an adequate combination of several treatment options and increasing the separate collection of recyclable materials it is possible to turn MSW management into a carbon neutral activity as well as improve its economic balance.

A methodology is proposed based on thermogravimetric analysis, deconvolution of the DTG signal and empirical correlations for characterizing biomass fuels for boilers and combustors. This methodology allows determining accurately and in a short time the main parameters required for industrial operation, as are the higher heating value (HHV), the contents of moisture, volatile matter, fixed carbon, ashes, carbon, hydrogen and oxygen, and the kinetic parameters of the thermal decomposition of the biomass. At the present time, these parameters are obtained by using specific equipment that are much more sophisticated and expensive than the methodology proposed. Twelve types of vegetable lignocellulosic biomasses have been used in the study, i.e., wastes from wood industry, food industry and agriculture. The comparison of the results obtained, based on the methodology developed in this paper, with those published in the literature evidence the validity of the methodology for a wide range of materials.