197,639 research outputs found
Combined Production of Hydrogen and Power from Heavy Oil Gasification: Pinch Analysis, Thermodynamic and Economic Evaluations
No full textIntegrated Gasification Combined Cycle (IGCC) represents a commercially proven technology available for the combined production of hydrogen and electricity power from coal and heavy residue oils. When associated with CO2 capture and sequestration facilities, the IGCC plant gives an answer to the search for a clean and environmentally compatible use of high sulphur and heavy metal contents fuels, the possibility of installing large size plants for competitive electric power and hydrogen production, and a low cost of CO2 avoidance.
The paper describes two new and realistic configurations of IGCC plant fed by refinery heavy residues and including a CO2 capture section, which are proposed on the basis of the experience gained in the construction of similar plants. They are based on oxygen blown entrained bed gasification and sized to produce a large amount of hydrogen and to feed one or two gas turbines of the combined cycle unit. The main thermodynamic and technological characteristics of the total plants are evaluated focusing on the heat integration between syngas cooling and combined cycle sections.
Moreover, the overall performance characteristics and investment cost are estimated to supply a reliable estimate for the cost of electricity, given a value for the hydrogen selling price
[Rezension von:] Belloni Zecchinelli, M.; Belloni, L. M.: Palazzo Gallio. - Menaggio <CO> : 1993
No full textCombined Production of Hydrogen and Power from Heavy Oil Gasification: Pinch Analysis, Thermodynamic and Economic Evaluations
No full text
The rhomboid family of intramembrane proteases, conserved regulators of cell communication
No full textThe development of multicellular organisms relies heavily on cell communication. Cells send and receive complex sets of signals, harmonising their growth and differentiation with that of other, often distant, cell populations. In animals, the Epidermal Growth Factor Receptor (EGFR) is an important mediator of cell communication. EGFR activation regulates various developmental events in nematodes, insects and vertebrates. In addition, mutations in human EGFRs have been associated with a number of cancers. In Drosophila, a key event triggering EGFR signalling is the regulated release of the extracellular portion of EGFR ligands. Rhomboid (Rho), an unusual polytopic protease, cleaves the transmembrane, inactive ligand precursor into an active, soluble form. Both the target sequence and Rho s catalytic site are embedded within the membrane bilayer and for this reason the reaction has been described as regulated intramembrane proteolysis.The work presented in this thesis begins with the characterisation of a classical fly mutation, roughoid (ru). Our results indicate that ru acts as a novel, positive regulator of EGFR signalling during eye development in Drosophila. ru was subsequently identified as rhomboid-3, one of seven rhomboid related genes encoded in the fly genome. Unexpectedly, we found that sequences related to Rhomboid are also common in unicellular organisms. A single microbial Rho has been previously studied, the aarA gene from the human pathogen Providencia stuartii. Strikingly, AarA appears to have a corresponding function to that of the Drosophila Rho: it is necessary for the release of a peptide-signal, which mediates cell communication in P. stuartii. AarA was indeed capable of substituting for the fly Rho in vivo. Vice versa, the fly Rho-1 restored the ability of aarA mutant bacteria to produce the extracellular signal mediating cell communication. These results suggest that Rho-mediated proteolysis might represent a very ancient mechanism for cell communication.The Drosophila genome contains seven Rhomboids. We began to investigate the possibility of additional substrates by analyzing the respiratory system phenotype observed in ru/rho-3 mutant embryos. During embryogenesis, specialised tracheal branches target and invade the ventral nerve cord, part of the central nervous system (CNS). In ru/rho-3 mutants, these branches are misrouted, and inappropriately cross the CNS midline. Also in this context Rho-3 functions to activate an EGFR ligand. Yet, the results reveal an unusual role for the pathway in the repulsion of migrating epithelial cells. EGFR ligands act as chemoattractants for a variety of cells in vivo and in vitro, including tumors. Our results provide a proof of principle that the EGFR can also mediate repulsion from the signal source.List of scientific papersI. Gallio M, Kylsten P (2004). "The roughoid locus identifies a novel function involved in epidermal growth factor receptor signalling in Drosophila." (Manuscript)II. Gallio M, Kylsten P (2000). "Providencia may help find a function for a novel, widespread protein family." Curr Biol 10(19): R693-4 https://pubmed.ncbi.nlm.nih.gov/11050401III. Gallio M, Sturgill G, Rather P, Kylsten P (2002). "A conserved mechanism for extracellular signaling in eukaryotes and prokaryotes. " Proc Natl Acad Sci U S A 99(19): 12208-13. Epub 2002 Sep 09 https://pubmed.ncbi.nlm.nih.gov/12221285IV. Gallio M, Englund C, Kylsten P, Samakovlis K (2004). "Rhomboid-3 orchestrates Slit-independent repulsion of tracheal branches at the CNS midline." Development (In Print) </p
The use of xylazine or acepromazine does not interfere in the lameness evaluation by inertial sensors
No full textAbstract not availableMarcos da Silva Azevedo, Flávio Desessards De La Côrte, Karin Erica Brass, Miguel Gallio, Ricardo Pozzobon, Marco Aurélio Ferreira Lopes, Luis Felipe Dias Lope
Studio di fattibilità di mini-celle del punto fisso del Gallio usate come riferimento di temperatura per applicazioni spaziali
No full textLa misura spettrale della radiazione infrarossa emessa dalla terra è uno dei metodi
più adoperati per studiare il bilancio radiativo terrestre. In questo contesto si
inserisce l’accordo ASI-CNR/INO n. 2021-33-HH.0 denominato “FORUM Balloon -
Sviluppo di un prototipo per pallone stratosferico”, nel quale l’INRiM si è impegnato
a sviluppare mini-celle del punto di fusione del gallio da montare su un prototipo di
corpo nero realizzato presso l’INO-CNR. L’obiettivo è quello di avere un riferimento
stabile e riproducibile di temperatura con il quale tarare i termometri a bordo del
corpo nero durante il volo. Il riferimento in questione essendo uno dei punti fissi della
Scala Internazionale di Temperatura (STI-90) assicura un alto livello di accuratezza
e la riferibilità diretta al sistema internazionale SI.
In questo rapporto tecnico sono riassunti i risultati ottenuti con un primo prototipo di
mini cella realizzata e caratterizzata interamente all’INRiM. L’obiettivo principale è
stato quello di conseguire il livello di miniaturizzazione richiesto affinché possa
essere agevolmente collocata ed integrata all’interno delle sorgenti di radianza a
corpo nero mantenendo allo stesso tempo inalterate le prestazioni. Nello specifico
si è resa necessaria la riduzione di almeno un ordine di grandezza in termini
dimensionali e di oltre due in termini di massa rispetto ad una cella al punto fisso
del gallio di tipo tradizionale utilizzata a livello di laboratorio primario per la taratura
dei termometri campione a resistenza di platino
Dr. Duane M. Jackson, Morehouse College, July 2011
No full textThis video is a conversation with Dr. Duane M. Jackson. Dr. Jackson talks about his paper, "Recall and the Serial Position Effect: The Role of Primacy and Recency on Accounting Students' Performance." Jackie Daniel, AUC Woodruff Library, is the interviewer
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