An experiment-based assessment of the feasibility of the CO2 geological storage in unexploited coal beds in northern Spain     

Celestino Gonzalez-Nicieza  M. Inmaculada Alvarez-Fernandez  M. Belen Prendes-Gero  Consuelo Pizarro-Garcia  Aldo O. Oliva-Gonzalez 《Environmental Earth Sciences》2014,71(8):3673-3684

The storage of CO₂ in unused coal mines is a viable option for reducing emissions of CO₂, whose accumulation in the atmosphere is one of the main contributors to global warming. Understanding CO₂ behaviour and storage capacity of the coal is an important first step before injecting the CO₂. We used experimental equipment to extract coal from a mine and to obtain a representative sample of both its internal structure (in terms of cleats, macropores, mesopores and micropores) and occluded gases. Storage capacity was studied in terms of variations in gas pressure. The adsorption isotherm was experimentally obtained applying a procedure specifically designed to avoid altering the coal. An unused coal bed was selected to determine how much CO₂ it could adsorb and to study the feasibility of storing power plant CO₂ in this kind of mine.  相似文献   

Holocene evolution of the Mar Chiquita coastal lagoon area (Argentina) indicated by pollen analysis     

Silvina Stutz  Aldo R. Prieto  Federico I. Isla 《第四纪科学杂志》2006,21(1):17-28

Palynologycal information was integrated with the aim to study vegetation history and environmental changes in Mar Chiquita coastal lagoon area (in the southeast of Buenos Aires province, Argentina) related to sea‐level fluctuations during the Holocene. Prior to 5000 yr BP a mosaic of psammophytic and halophytic communities developed on extensive sandy flats. Between 4000 and 2500 yr BP, during a period of sea‐level stabilisation, similar halophytic communities developed in the south and in the middle part of the present lagoon. Between 4500 and 3500 yr BP hydrophytic and halophytic communities developed in Laguna Hinojales. Beginning 2500 yr BP, when sea level was nearing its present position, modern plant communities became established. Pollen records suggest that littoral evolution of the area was much more complex than previous models have described, introducing new evidence of the geomorphological evolution of Mar Chiquita coastal lagoon. The estuarine environment was delimited by a system of barrier islands instead of a linear prograding barrier, as has been proposed. Copyright © 2005 John Wiley & Sons, Ltd.  相似文献   

Host galaxies and black hole masses of low- and high-luminosity radio-loud active nuclei     

Renato Falomo  Nicoletta Carangelo  Aldo Treves 《Monthly notices of the Royal Astronomical Society》2003,343(2):505-511

  相似文献   

An optical view of BL Lacertae objects     

Renato?FalomoEmail author  Elena?Pian  Aldo?Treves 《Astronomy and Astrophysics Review》2014,22(1):73

BL Lac objects are active nuclei, hosted in massive elliptical galaxies, the emission of which is dominated by a relativistic jet closely aligned with the line of sight. This implies the existence of a parent population of sources with a misaligned jet that have been identified with low-power radiogalaxies. The spectrum of BL Lacs, dominated by non-thermal emission over the whole electromagnetic range, together with bright compact radio cores, high luminosities, rapid and large amplitude flux variability at all frequencies and strong polarization makes these sources an optimal laboratory for high energy astrophysics. A most distinctive characteristic of the class is the weakness or absence of spectral lines, that historically hindered the identification of their nature and ever thereafter proved to be a hurdle in the determination of their distance. In this paper, we review the main observational facts that contribute to the present basic interpretation of this class of active galaxies. We overview the history of the BL Lac objects research field and their population as it emerged from multi-wavelength surveys. The properties of the flux variability and polarization, compared with those at radio, X-ray and gamma-ray frequencies, are summarized together with the present knowledge of the host galaxies, their environments, and central black hole masses. We focus this review on the optical observations, which played a crucial role in the early phase of BL Lacs studies, and in spite of extensive radio, X-ray, and recently gamma-ray observations, could represent the future major contribution to the unveiling of the origin of these sources. In particular, they could provide a firm conclusion on the long debated issue of the cosmic evolution of this class of active galactic nuclei and on the connection between formation of supermassive black holes and relativistic jets.  相似文献   

Handbook of groundwater engineering     

Aldo Fiori 《水文科学杂志》2017,62(16)

  相似文献   

In situ correlations between PAH and biotransformation activities in mussels and fish     

Jean-Francois Narbonne  Philippe Garrigues  Anne Mathieu  Christophe Raoux  Daniel Ribera  Jean-Louis Monod  Aldo Viarengo  Jean-Pierre Salaün  Marc Lafaurie 《Marine environmental research》1989,28(1-4)

  相似文献   

Fractionation of oxygen and hydrogen isotopes in evaporating water   总被引：1，自引：0，他引：1  

Boaz Luz  Eugeni Barkan  Aldo Shemesh 《Geochimica et cosmochimica acta》2009,73(22):6697-316

Variations in oxygen and hydrogen isotope ratios of water and ice are powerful tools in hydrology and ice core studies. These variations are controlled by both equilibrium and kinetic isotope effects during evaporation and precipitation, and for quantitative interpretation it is necessary to understand how these processes affect the isotopic composition of water and ice. Whereas the equilibrium isotope effects are reasonably well understood, there is controversy on the magnitude of the kinetic isotope effects of both oxygen and hydrogen and the ratio between them. In order to resolve this disagreement, we performed evaporation experiments into air, argon and helium over the temperature range from 10 to 70 °C. From these measurements we derived the isotope effects for vapor diffusion in gas phase (ε_{diff(HD¹⁶O)} for D/H and ε_{diff(H2¹⁸O)} for ¹⁸O/¹⁶O). For air, the ratio ε_{diff(HD¹⁶O)}/ε_{diff(H2¹⁸O)} at 20 °C is 0.84, in very good agreement with Merlivat (1978) (0.88), but in considerable inconsistency with Cappa et al. (2003) (0.52). Our results support Merlivat’s conclusion that measured ε_{diff(HD¹⁶O)}/ε_{diff(H2¹⁸O)} ratios are significantly different than ratios calculated from simplified kinetic theory of gas diffusion. On the other hand, our experiments with helium and argon suggest that this discrepancy is not due to isotope effects of molecular collision diameters. We also found, for the first time, that the ε_{diff(HD¹⁶O)}/ε_{diff(H2¹⁸O)} ratio tends to increase with cooling. This new finding may have important implications to interpretations of deuterium excess (d-excess = δD − 8δ¹⁸O) in ice core records, because as we show, the effect of temperature on d-excess is of similar magnitude to glacial interglacial variations in the cores.  相似文献   

Asbestiform and non-asbestiform morphologies in a talc and vermiculite mine from the province of Córdoba (Argentina): a case study     

Leticia Lescano  Francisco Locati  Jorge Sfragulla  Silvina Marfil  Aldo Bonalumi  Pedro Maiza 《Environmental Earth Sciences》2017,76(18):631

In this work, a talc and vermiculite mine from the province of Córdoba (Argentina) was investigated with special emphasis on the occurrence of asbestiform and non-asbestiform phases. The meta-ultramafic rock was studied by a multimethodological approach, complementing field studies with petrographic-mineralogical, compositional and morphological analyses. Samples were examined by stereomicroscopy, polarizing light microscopy, SEM–EDS, XRD, DSC-TGA and FTIR. Complementary, compositional and textural analyses were performed with FE-SEM–EDS and EPMA. Talc-rich veins with a laminar and fibrous appearance were at first recognized. However, the fibrous morphology observed both in the field and by microscopy is due to an apparent habit because of the sample orientation. To avoid erroneous interpretations, studies by secondary electron images (SEM) are fundamental to carrying out this type of analysis. Tremolite was identified in different zones of the outcrop; however, only ~40% of the crystals located in the vermiculite zone have dimensions to be considered as asbestiform fibres in the range of respirable particles. In these types of complex deposits affected by superimposed metamorphic, igneous and deformational events, multimethodological approaches are necessary to develop models of occurrence of asbestiform morphologies that may be applicable to other with similar characteristics.  相似文献   

Biochemical effects of trace metals     

Aldo Viarengo 《Marine pollution bulletin》1985,16(4):153-158

  相似文献   

Thermal state of the Campi Flegrei caldera inferred from seismic attenuation tomography     

Salvatore de Lorenzo  Paolo Gasparini  Francesco Mongelli  Aldo Zollo 《Journal of Geodynamics》2001,32(4-5)

A three-dimensional Qp image of the Campi Flegrei caldera between 0 and 3 km of depth has been inferred by the inversion of P rise time and pulse width data of 87 local earthquakes recorded during the last bradiseismic crisis by a local array deployed in the area by the University of Wisconsin. The availability of both thermal measurements in 5 deep boreholes and of a heat flow surface map of the area allowed us to calibrate the local temperature F vs. Qp relationship. The comparison of Qp, Vp and Vp/Vs images, combined with hydrogeological and geochemical data from deep boreholes, allowed us to distinguish some low-Qp anomalies related to the presence of fluids in the rocks from a deep low-Qp anomaly related to the conductive cooling of a magma reservoir. The deep anomaly is located in the same zone where several authors believe that the volcanic and magmatic activity migrated after the Neapolitan Yellow Tuff eruption. Moreover this anomaly includes the area where the existence of a magma chamber at depth between 4 and 5 km was inferred by an active seismic experiment.  相似文献