Search results for "carbon"
showing 10 items of 6057 documents
Husk Energy Supply Systems for Sunflower Oil Mills
2020
Together with solar, wind, and hydro renewable energy sources (RES), biomass constitutes an integral part of the high-renewables electricity systems. Considerable feedstocks for electricity generation are process-based residues. Ukraine is the world leader in sunflower seed production, therefore, husk (a by-product of oil production) is a promising biofuel for combustion- based power plants. The plants consume primarily electricity and fossil fuels (natural gas or fuel oil) for steam production. Their usage affects the edible oil production cost and impacts on climate change. The above facts force us to look for alternatives. By-product (husk) utilization can reduce exhaustible energy consu…
Contour map of the top of the regional geothermal reservoir of Sicily (Italy).
2015
An integrated review of existing geological and geophysical data – partly acquired during oil and gas exploration – combined with new data provided by deep geothermal studies of selected key areas, was used for the 3D modeling and mapping of the top of the geothermal reservoir developed at a regional scale in Sicily (Central Mediterranean). The resulting 1:500,000 scale map covers the area of the whole Sicily (about 25,700 km2) and is devoted to represent the main input for both the thermal modeling and the evaluation of geothermal potential at a regional scale. As the map indicates the distribution at depth of a likely target for geothermal drilling, it can be also used as a rough indicato…
A methodology for the control of the residual lifetimes of carbon fibre reinforced composite pressure vessels
2005
International audience; Pressure vessels must be periodically proof tested. Traditional techniques for metal vessels are inapplicable for composite vessels as the latter do not break by crack propagation so that the reasoning behind the traditional testing procedures is not appropriate. Damage accumulation leading to the degradation of a composite vessel is by fibre failure. Fibres show a wide distribution in strengths and loading a composite inevitably breaks some. The method which has been developed is supported by an analysis of delayed fibre failure due to the relaxation of the resin around fibre breaks. This provokes overloading of intact fibres neighbouring breaks. The time until a cr…
Complex multilayer carbon structures for green energetics
2017
The authors greatly acknowledge the IMIS2 project of the National Reform Programme of Latvia for financial support. The publication costs of this article were covered by the Estonian Academy of Sciences and the University of Tartu.
Ciclo del carbono y modelización biogeoquímica de un lago somero hipertrófico: la Albufera de Valencia
2015
Los lagos someros son uno de los ecosistemas acuáticos más numerosos a nivel global y hacen posible el desarrollo de multitud de actividades de interés económico y recreativo. En las últimas décadas, gran parte de estos lagos se han visto sujetos a un proceso de eutrofización cultural que a menudo conlleva una transición desde un estado "claro" caracterizado por una alta transparencia del agua y gran abundancia de macrófitos, a un estado "turbio" caracterizado por una baja transparencia del agua, dominancia de fitoplancton y macrófitos sumergidos prácticamente ausentes. El cambio que experimentó la Albufera de Valencia al estado turbio a principios de los años 1970 como resultado de un inte…
HAGHÌA TRIÀDA (CRETA): REINTEGRAZIONE DELLA LACUNA COME PRESENZA DELL’ASSENZA
2015
Il saggio intende presentare l’intervento, dei primi del sec. XX, nel palazzo-villa di Haghìa Triàda, nell’isola di Creta, per la conservazione del suo megaron. La sala possiede forma quasi quadrata, con sedili, ricoperti di lastre di gesso alabastrino, disposti nei tre lati; di fronte ad essa è una corte che la separa dall’esterno. La sala doveva avere una copertura sostenuta da pilastri di legno, che portavano le travi e i solai degli ambienti sovrastanti. Gli alloggiamenti, dove un tempo erano inseriti i pilastri di legno, risultavano perimetrati dalle lastre di gesso che ricoprivano le pareti della sala. In detti vani furono rinvenuti resti di legno carbonizzato, a testimonianza di un i…
Synthesis and biological evaluation of novel peptidomimetics as rhodesain inhibitors
2016
Novel rhodesain inhibitors were developed by combining an enantiomerically pure 3-bromoisoxazoline warhead with a 1,4-benzodiazepine scaffold as specific recognition moiety. All compounds were proven to inhibit rhodesain with Ki values in the low-micromolar range. Their activity towards rhodesain was found to be coupled to an in vitro antitrypanosomal activity, with IC50 values ranging from the mid-micromolar to a low-micromolar value for the most active rhodesain inhibitor (R,S,S)-3. All compounds showed a good selectivity against the target enzyme since all of them were proven to be poor inhibitors of human cathepsin L. Novel rhodesain inhibitors were developed by combining an enantiomeri…
The potential of γ-ray spectroscopy for soil proximal survey in clayey soils Le potentiel de la spectroscopie a rayons-γ lors de l’echantillonnage pe…
2013
La spettroscopia di raggi-γ misura la distribuzione e l’intensità della radiazione gamma emessa naturalmente dai suoli o dalle rocce. I radionuclidi più importanti nel suolo come fonte di raggi gamma sono: 40K, 232Th, 238U ed 137Cs, quest’ultimo di origine artificiale, principalmente legato all’esplosione di Chernobyl o ad inquinamenti radioattivi. La distribuzione e la quantità di questi radionuclidi è strettamente dipendente dalla mineralogia del parent material e dalla capacità di scambio cationico del suolo. Scopo di questo lavoro è quello di mostrare le potenzialità di un rilevamento prossimale con spettroscopia di raggi-γ in campi sperimentali con suoli argillosi della Sicilia occiden…
MECCANISMI DI DEFORMAZIONE IN ROCCE CARBONATICHE STRATIFICATE: IMPLICAZIONI PER LA CIRCOLAZIONE DEI GEOFLUIDI
2014
Nel presente lavoro è stata condotta un’analisi quali/quantitativa degli elementi strutturali che caratterizzano alcuni affioramenti carbonatici presenti nella zona di catena esterna della Sicilia occidentale (Monte Maranfusa e Montangna Grande), e nella zona di avampaese in Sicilia sud-orientale (Monti Iblei). Le proprietà petrofisiche delle rocce carbonatiche (porosità, permeabilità), sono strettamente legate all’evoluzione diagenetica di quest’ultime e cambiano in funzione della natura, dell’organizzazione e della forma degli elementi che le costituiscono (grani, pori, cemento, minerali, ecc.). Tali proprietà sono inoltre fortemente condizionate dalla natura delle discontinuità tettonich…
Carbon stocks in a 50‑year‑oldEucalyptus camaldulensisstand in Sicily, Italy
2015
Eucalyptus stands in semi-arid areas may contribute to enhance carbon (C) stocks in both biomass and soil. However, the limited information available is mainly focused on short-rotation plantations. In this study, the above- and below-ground C pools in five 50-year-old Eucalyptus camaldulensis Dehnh. stands planted on Miocenic evaporitic deposits in Sicily, Italy, with a xeric and thermic pedoclimate, were measured. Above-ground biomass was determined by partitioning and weighing branches, stem and leaves. Below-ground C pools included the determination of litter, root biomass, and soil organic and inorganic C. In terms of the above-ground biomass, the E. camaldulensis stand accumulated on …