Coal fly ash and steel slag valorisation throughout a vitrification process     

H. R. Guzmán-Carrillo  J. M. Pérez  E. A. Aguilar Reyes  M. Romero 《International Journal of Environmental Science and Technology》2018,15(8):1757-1766

The aim of this research was to evaluate the feasibility of using the vitrification process as an alternative solution to the disposal of a coal fly ash and metallurgical slags in landfills. The starting wastes were characterised in terms of chemical, granulometric, mineralogical, and microstructural analysis. A selected batch composition composed by 58.5% fly ash, 31.5% metallurgical slag and 10.0 Na₂O% (wt%) was melted at 1450 °C and poured to obtain monolithic glass samples. The environmental behaviour of the starting wastes and the resulting glass was evaluated by standard leaching tests, which shows that vitrification leads to a stabilisation process in which the inorganic components of the wastes are immobilised throughout their incorporation into the glass structure. Moreover, vitrification transforms those hazardous wastes into a new non-hazardous glass. A preliminary study shows that the new glass is suitable for developing glass–ceramic tiles appropriate for floor pavement and wall covering.  相似文献   

The Late Neoproterozoic magmatism in the Ediacaran series of the Eastern Pyrenees: new ages and isotope geochemistry   总被引：1，自引：0，他引：1  

J. M. Casas  M. Navidad  P. Castiñeiras  M. Liesa  C. Aguilar  J. Carreras  M. Hofmann  A. Gärtner  U. Linnemann 《International Journal of Earth Sciences》2015,104(4):909-925

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The educational attainment of the second generation and transnational shame: Toward deeper comparative analysis          下载免费PDF全文

Filomeno V. Aguilar Jr. 《Singapore journal of tropical geography》2015,36(3):300-304

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Demersal assemblages and depth distribution of elasmobrachs from the continental shelf and slope off the Balearic Islands (western Mediterranean)     

Massuti  Enric; Moranta  Joan 《ICES Journal of Marine Science》2003,60(6):1398

When this article was originally published the author's  相似文献   

Heterogeneous distribution of organochlorine contaminants in the blubber of baleen whales: implications for sampling procedures     

Alex Aguilar  A sumpci Borrell 《Marine environmental research》1991,31(4)

The concentration of DDTs and PCBs was determined in two strata (inner and outer) of the blubber of fin and sei whales from the eastern North Atlantic. In the two species residue levels of all organochlorines in the outer layer were significantly higher than in the inner one. The DDE/tDDT ratio did not show significant variation between strata, but the tDDT/PCB ratio was higher in the outer layer than in the inner one. Such differences between strata cannot be explained by variation in the quantity of lipids present in the blubber and probably indicate a constant organochlorine distribution pattern in the blubber of large whales. The differential role of the blubber strata in the fattening cycle, the heterogeneous lipid composition of blubber throughout its depth and the different turnover rates of pollutants in the layers are the probable factors responsible for these observed differences in pollutant distribution between blubber strata. Because of this heterogeneous distribution, blubber samples collected from cetaceans for pollutant analyses should include equal representation of all layers in order to be representative of the individual's pollutant load. This is especially important when sampling stranded specimens or taking biopsy samples from large free-ranging whales.  相似文献   

V-R diagram for spiral galaxies. New insights into the hubble sequence     

M. Prieto  A. Campos Aguilar  C. García 《Astrophysics and Space Science》1989,157(1-2):321-329

We examine the relation between the global parameters of spiral galaxies and their morphological type. We have represented the rotational velocityV at a radius of 25 mag arc sec^–2 against this radiusR for a sample of 56 galaxies. Different types of galaxies appear separated on this diagram. We have plotted above theV-R diagram isolines of total mass, angular momentum and mean surface density for isolated galaxies with circular motion in centrifugal equilibrium showing: (1) That the parameter that represents the morphological type is the mean surface density or its observational parameterV ²/R. (2) From aV-R diagram we can easily see what kinds of correlations we expect to find between the global properties of galaxies and their morphological type. (3) For every morphological type of galaxies there is a critical mass above which there is a change in its dynamical behaviour. Finally, consideringV ²/R as representative of the morphological type, we can deduce theoretically the empirical Tully-Fisher relation and the dependence of the slope and the zero point on the morphological type. The separation in logV that we expect to find for different types of galaxies for a constant luminosity is the same order as the experimental errors in the determination of logV. This explains the tight power-law relationship observed between this and the luminosity.  相似文献   

Biological soil crusts exhibit a dynamic response to seasonal rain and release from grazing with implications for soil stability   总被引：2，自引：0，他引：2  

A. Jimenez Aguilar  E. Huber-Sannwald  J. Belnap  D.R. Smart  J.T. Arredondo Moreno 《Journal of Arid Environments》2009,73(12):1158-1169

In Northern Mexico, long-term grazing has substantially degraded semiarid landscapes. In semiarid systems, ecological and hydrological processes are strongly coupled by patchy plant distribution and biological soil crust (BSC) cover in plant-free interspaces. In this study, we asked: 1) how responsive are BSC cover/composition to a drying/wetting cycle and two-year grazing removal, and 2) what are the implications for soil erosion? We characterized BSC morphotypes and their influence on soil stability under grazed/non-grazed conditions during a dry and wet season. Light- and dark-colored cyanobacteria were dominant at the plant tussock and community level. Cover changes in these two groups differed after a rainy season and in response to grazing removal. Lichens with continuous thalli were more vulnerable to grazing than those with semi-continuous/discontinuous thalli after the dry season. Microsites around tussocks facilitated BSC colonization compared to interspaces. Lichen and cyanobacteria morphotypes differentially enhanced resistance to soil erosion; consequently, surface soil stability depends on the spatial distribution of BSC morphotypes, suggesting soil stability may be as dynamic as changes in the type of BSC cover. Longer-term spatially detailed studies are necessary to elicit spatiotemporal dynamics of BSC communities and their functional role in biotically and abiotically variable environments.  相似文献   

Correlations between pedological parameters in relation to lithology and soil type in Almería (SE Spain)     

M. Sierra  F.J. Martínez  C. Sierra  J. Aguilar 《Journal of Arid Environments》2009,73(4-5):493-498

South-eastern Spain can be considered as a model of desertification in the Mediterranean environment. The desertification intensity varies according to two different geomorphological areas: glacis and badlands. The modal soil of the glacis area is calcic Luvisol, for which the severity of degradation depends on the degree of aridity and human activities, which give rise to the following degradation series: calcic Luvisol – luvic Calcisol – haplic, petric or aridic Calcisol. The badland area is more desertified than the glacis area. The modal soils in the badland area depend exclusively on the parent material: aridic Arenosols on sand; eutric, calcaric or gypsiric Regosols on silt and calcilutite; aric Gypsisols on gypsum; and aric Solonchaks on parent material rich in halite. Luvisols, Gypsisols and Solonchaks can be considered relict paleosols that developed in a wetter climate than the prevailing arid conditions that make clay illuviation or the formation of gypsic or salic horizons impossible. Soil quality reduction is shown by creating a database for soils’ physical and chemical properties, ranging in classes that facilitate the use of these properties as an effective tool for decision making with regard to desertification.  相似文献   

On the vertical families of two-dimensional tori near the triangular points of the Bicircular problem     

Enric Castellà  Àngel Jorba 《Celestial Mechanics and Dynamical Astronomy》2000,76(1):35-54

This paper focuses on some aspects of the motion of a small particle moving near the Lagrangian points of the Earth–Moon system. The model for the motion of the particle is the so-called bicircular problem (BCP), that includes the effect of Earth and Moon as in the spatial restricted three body problem (RTBP), plus the effect of the Sun as a periodic time-dependent perturbation of the RTBP. Due to this periodic forcing coming from the Sun, the Lagrangian points are no longer equilibrium solutions for the BCP. On the other hand, the BCP has three periodic orbits (with the same period as the forcing) that can be seen as the dynamical equivalent of the Lagrangian points. In this work, we first discuss some numerical methods for the accurate computation of quasi-periodic solutions, and then we apply them to the BCP to obtain families of 2-D tori in an extended neighbourhood of the Lagrangian points. These families start on the three periodic orbits mentioned above and they are continued in the vertical (z and ż) direction up to a high distance. These (Cantor) families can be seen as the continuation, into the BCP, of the Lyapunov family of periodic orbits of the Lagrangian points that goes in the (z, ż) direction. These results are used in a forthcoming work [9] to find regions where trajectories remain confined for a very long time. It is remarkable that these regions seem to persist in the real system. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   

A new methodology based on littoral community cartography dominated by macroalgae for the implementation of the European Water Framework Directive     

Ballesteros E  Torras X  Pinedo S  García M  Mangialajo L  de Torres M 《Marine pollution bulletin》2007,55(1-6):172-180

Macroalgae is a biological key element for the assessment of the ecological status in coastal waters in the frame of the European Water Framework Directive (WFD, 2000/60/EC). Here we propose a methodology for monitoring water quality based on the cartography of littoral and upper-sublittoral rocky-shore communities (CARLIT, in short). With the use of spatial databases, GIS, and available information about the value of rocky-shore communities as indicators of water quality, it is possible to obtain an environmental quality index representative of the ecological status of rocky coasts. This index, which completely fulfils the requirements of the WFD, is expressed as a ratio between the observed values in the sector of shore that is being assessed and the expected value in a reference condition zone with the same substrate and coastal morphology (Ecological Quality Ratio, EQR). The application of this index to the coast of Catalonia (North-Western Mediterranean) is presented.  相似文献