Sobre el status de Physalis ixocarpa Brot. ex Hormen

On the status of Physalis ixocarpa Brot. ex HormenPalabras clave. Taxonomía vegetal, Solanaceae, Physalis.Key words. Plant Taxonomy, Solanaceae, Physalis

Aportaciones a la flora de la provincia de Segovia

SANZ-ELORZA, M., DANA, E. & SOBRINO, E. 2002. Aportaciones a la flora de la provincia de Segovia. Bot. Complutensis 26: 35-46. Se presentan novedades referentes a quince especies de plantas fanerógamas de interés florístico y corológico para la provincia de Segovia, la mayoría alóctonas o xenófitas. De ellas, once se citan por primera vez en la provincia de Segovia. Las cuatro restantes son taxa que requieren algún tipo de aclaración en lo que concierne a su status en nuestra provincia. Para todas las especies se aportan mapas corológicos con indicación de la presencia a nivel de cuadrícula UTM de 10 x 10 km.SANZ-ELORZA, M., DANA, E. & SOBRINO, E. 2002. Contributions to the Segovia province flora (Spain). Bot. Complutensis 26: 35-46. In this paper, we provide chorological, cartographic and autecological information concerning fifteen vascular plant species in the administrative province of Segovia (Central Spain). The following taxa were recorded for the first time in the area: Eschscholzia californica Cham., Matthiola incana (L.) R.Br. subsp. incana, Diplotaxis catholica (L.) DC., Coronilla repanda (Poir.) Guss. subsp. dura (Cav.) Cout., Oenothera glazioviana Micheli, Stachys byzantina C. Koch, Solanum villosum Miller subsp. villosum, Solanum pseudocapsicum, Hemerocallis fulva (L.) L., Cortaderia selloana (Schultes & Schultes fil.) Ascherson & Graebner., Narcissus jonquilla L. All of them with the exception of Diplotaxis catholica and Narcissus jonquilla are aliens to Segovia. We also provide additional cartographic information about new populations of other four species: Rhus coriaria L., Amsinckia lycopsoides (Lehm.) Lehm., Solanum physalifolium Rusby var. nitidibaccatum (Bitter) Emonds, Achillea filipendulina Lam. the presence of which was already known in the area

La flora alóctona de Aragón (España)

En este trabajo, presentamos una aproximación a la flora alóctona de Aragón a partir de la información disponible en la bibliografía, complementada con la de nuestras propias observaciones y experiencia. Los resultados revelan que existen, al menos, 313 especies de plantas vasculares exóticas naturalizadas o subespontáneas en la región, de las cuales el 24 % manifiestan carácter invasor. No obstante, dentro de ellas solamente 17 son transformadoras, y menos aún las que suponen un riesgo para la conservación del medio natural. Pese a ello, no debe subestimarse la importancia del fenómeno por lo que recomendamos la vigilancia de las áreas más sensibles, que son, una vez más, los ambientes riparios y las comarcas de clima más suave.This paper examines the alien flora of Aragón (Spain), a vast region of the northeastern Iberian Peninsula. The source of data was mainly literature references, complemented with authors’ experience. We can stablish, by the results obtained, a regional catalogue of 313 alien vascular plants species, of which 17 are transformers. A number of them are potentially dangerous for natural ecosystems. We recommend be cautious and keeping watch on sensitive areas, as riparian habitats and temperate zones

Aportaciones a la flora de la provincia de Segovia (España) II

Se presentan en este trabajo datos de interés florístico y corológico, referentes a dieciocho especies de plantas fanerógamas, para la comunidad de Castilla y León, la mayoría alóctonas o xenófitas. Se citan por primera vez en la provincia de Segovia Polycarpon tetraphyllum, Papaver somniferum, Wisteria sinensis, Coriandrum sativum, Origanum majorana, Salpichroa origanifolia, Buddleja davidii, Orobanche rapun-genistae, Lonicera japonica, Aster novi-belgii, Galinsoga parviflora, Cosmos bipinnatus y Artemisia verlotiorum. Es novedad para la provincia de Valladolid Crataegus azarolus, y se cita por primera vez en la provincia de Soria Buddleja davidii. Consolida ajacis, Ipomoea purpurea, Solanum physalifolium var. nitidibaccatum y Gaillardia aristata requieren algún tipo de aclaración en lo que concierne a su status en las provincias de Segovia y Palencia. Para dieciséis de las especies se aportan mapas corológicos con indicación de la presencia a nivel de cuadrícula UTM de 10 x 10 km

Contribution to the knowledge of alien vascular flora of Castilla and León

Se analizan algunas especies de flora vascular alóctona de Castilla y León (España

Effect of pressure on the behavior of copper-, iron-, and nickel-based oxygen carriers for chemical-looping combustion

8 pages, 8 figures, 2 tables.The combustion process integrated by coal gasification and chemical-looping combustion (CLC) could be used in power plants with a low energy penalty for CO2 capture. This work analyzes the main characteristics related to the CLC process necessary to use the syngas obtained in an integrated gasification combined cycle (IGCC) power plant. The kinetics of reduction with H2 and CO and oxidation with O2 of three high-reactivity oxygen carriers used in the CLC system have been determined in a thermogravimetric analyzer at atmospheric pressure. The iron- and nickel-based oxygen carriers were prepared by freeze-granulation, and the copper-based oxygen carrier was prepared by impregnation. The changing grain size model (CGSM) was used for the kinetic determination, assuming spherical grains for the freeze-granulated particles containing iron and nickel and a platelike geometry for the reacting surface of the copper-based impregnated particles. The dependence of the reaction rates on temperature was low, with the activation energy values varying from 14 to 33 kJ mol-1 for the reduction and 7 to 15 kJ mol-1 for the oxidation. The reaction order depended on the reacting gas and oxygen carrier, with values ranging from 0.25 to 1. However, an increase in the operating pressure for the IGCC + CLC system increases the thermal efficiency of the process, and the CO2 is recovered as a high pressure gas, decreasing the energy demand for further compression. The effect of pressure on the behavior of the oxygen carriers has been analyzed in a pressurized thermogravimetric analyzer at 1073 K and pressures up to 30 atm. It has been found that an increase in total pressure has a negative effect on the reaction rates of all the oxygen carriers. Moreover, the use of the CGSM with the kinetic parameters obtained at atmospheric pressure predicted higher reaction rates than those experimentally obtained at higher pressures, and therefore, the kinetic parameters necessary to design pressurized CLC plants must be determined at the operating pressure. © 2006 American Chemical Society.This work was carried out with financial support from the European Coal and Steel Community Project (7220-PR125) and the Spanish Ministry of Education and Science (Project CTQ 2004-04034). The authors thank Dr. Anders Lyngfelt and Dr. Tobias Mattisson for the preparation of the freeze-granulated particles.Peer Reviewe

Contribución al conocimiento de las xenófitas en España: catálogo provisional de la flora alóctona de Almería

Contribution to the knowledge about xenophyte.s in Spain: Provisional check - list of alien flora in Almería.Palabras clave. Biodiversidad, invasiones biológicas, especies alktonas, sureste ibérico.Key words. Biodiversity, biological invasions, exotic species, South-eastern Iberia') Peninsula

Calcination of calcium-based sorbents at pressure in a broad range of CO2 concentrations

11 figures, 3 tablesThe calcination reaction of two limestones and a dolomite with different porous structures was studied by thermogravimetric analysis. The effects of calcination temperature (1048-1173 K), particle size (0.4 2.0 mm), CO2 concentration (0 80%) and total pressure (0.1 1.5 MPa) were investigated. SEM analysis indicated the existence of two different particle calcination models depending on the sorbent type: a shrinking core model with a sharp limit between the uncalcined and calcined parts of the particle and a grain model with changing calcination conversion at the particle radial position. The appropriate reaction model was used to determine the calcination kinetic parameters of each sorbent. Chemical reaction and mass transport in the particle porous system were the main limiting factors of the calcination reaction at the experimental conditions. A Langmuir-Hinshelwood-type kinetic model using the Freundlich isotherm was proposed to account for the effect of the CO2 during sorbent calcination. This allowed us to predict the calcination conversion of very different sorbents in a broad range of CO2 partial pressures. Total pressure also inhibited the sorbent calcination. This fact was accounted for by an additional decrease in the molecular diffusion coefficient with increasing total pressure with respect to that indicated by Fuller's equation.This research was carried out with the financial support from the Comisión Interministerial de Ciencia y Tecnología (CICYT) (Project No. AMB 98-0883). The authors thank Dr. Diego Alvárez for his assistance with the SEM technique.Peer Reviewe

The use of ilmenite as oxygen-carrier in a 500Wth Chemical-Looping Coal Combustion unit

12 pages, 13 figures, 6 tablesChemical-Looping Combustion, CLC, is a promising technology to capture CO2 at low cost in fossil-fuelled power plants. In CLC the oxygen from air is transferred to the fuel by a solid oxygen-carrier that circulates between two interconnected fluidized-bed reactors: the fuel- and the air-reactor. This work studies the CLC technology in a 500Wth facility fuelled with bituminous coal with ilmenite as oxygen-carrier. The effect of temperature and coal particle size on coal conversion and combustion efficiency was assessed. Char gasification and combustion of both gasification products and volatile matter were evaluated. At higher temperatures, gasification and combustion reactions are promoted. Carbon capture and combustion efficiencies grow with the temperature, with faster increase at temperatures higher than 910°C. The outgoing unburnt gases come from volatile matter that was not fully oxidized by ilmenite. Little CH4 was measured and there were neither hydrocarbons heavier than CH4 nor tars in the fuel-reactor outlet. At 870°C the char conversion was 15% and reached 82% at 950°C. The combustion efficiency in the fuel-reactor increased from 70% at 870°C to 95% at 950°C. The results show that ilmenite has good behavior as oxygen-carrier and that optimizing CLC with coal can lead to energy production with high CO2 capture.This work was partially supported by the European Commission, under the RFCS program (ECLAIR Project, Contract RFCP-CT-2008-0008), from Alstom Power Boilers and by the Spanish Ministry of Science and Innovation (Project ENE2010-19550). A. Cuadrat thanks CSIC for the JAE Pre. fellowship. Alberto Abad thanks to the Ministerio de Ciencia e Innovación for the financial support in the course of the I3 Program.Peer Reviewe

Sobre la presencia de cactáceas naturalizadas en la costa meridional de Cataluña

The authors report on the finding of eight new alien cacti naturalised in the Baix Camp (Tarragona). Three of these are new records for Europe, two are new records for Spain and one is a first record for Tarragona province. Two further species are not new floristic records however some revision of their status in Catalonia is required. Discussed is the extensive use of alien plant species in garden design in the area and the mildness of the local climatic conditions which has resulted in the greatest accumulation of naturalised cacti in Europe.En una riera de la comarca del Baix Camp (Tarragona) hemos encontrado ocho especies de cactáceas alóctonas naturalizadas. De ellas, tres son nuevas para Europa, dos nuevas para España, una nueva para la provincia de Tarragona y, finalmente, otras dos sin ser novedad florística requieren aclaraciones en lo concerniente a su estatus en Cataluña. Este hallazgo representa la mayor biodiversidad de cactáceas citada hasta el momento para toda Cataluña, para toda la Península Ibérica e incluso para toda Europa. La introducción de especies exóticas en general y de cactáceas en particular se ve favorecida en esta comarca de la costa mediterránea por el desarrollo de una jardinería basada casi exclusivamente en elementos foráneos y en la existencia de una climatología muy favorable