1,721,210 research outputs found
CO2 Capture and Removal System for a Gas-Steam Combined Cycle
No full textThis paper presents the study of a natural gas fired power cycle which includes a carbon dioxide capture plant based on an absorption and scrubbing system. The interest in this integration is due to the widespread use of combined cycles in the power generation sector because of their high energy conversion efficiency. Energy consumption of the capture and removal system and its influence on the energetic performance of the power plant have been calculated. Mass and heat balance calculations are carried out by using the software tools GateCycle for the combined cycle and Aspen+ Software for the absorption process. Results of plant performance calculations, including compression of the captured carbon dioxide, are presented. The results, compared to the combined cycle power plant with no carbon dioxide capture, have also been compared to the more commonly known carbon dioxide capture process based on atmospheric absorption with MEA
"Carte altomedievali e centri di documentazione. Ricerche storico-linguistiche e considerazioni teorico-metodologiche"
No full text
Effect of botulinum neurotoxin on the urinary bladder: novel insights on mechanism of action
No full textBotulinum neurotoxins (BoNTs) recently tarted to be used in common urologic practice for the treatment of neurogenic and non neurogenic detrusor overactivity (DO) refractory to all conventional treatments. The rationale was that botulinum toxin, particularly BoNT type A (BoNT/A), was able to block the presynaptic release of acetylcholine (ACh) from the parasympathetic efferent nerves thus paralyzing the detrusor smooth muscle, an action similar to that performed in skeletal muscles. With the present review we aimed at assessing the state of the art on the mechanisms of function of botulinum toxins in the management of urological dysfunctions. We searched PubMed using the medical subject heading (MeSH) term botulinum toxin in conjunction with any of the following terms: mechanism of action, bladder, afferent and efferent nervous transmission, urothelium and suburothelium, detrusor overactivity. Review articles and published abstracts were identified by limiting for review and abstract, respectively. The reference list of review and original papers were reviewed to identify any missed papers. A similar search strategy was applied in EMBASE using identical EMTREE terms. Recent evidences in in vivo and in in vitro studies suggest that in addition to a direct effect on detrusor motor innervation, BoNT/A also modulates intrinsic bladder reflexes through a multimodal effect on sensory pathways. Such mechanisms may contribute to the efficiency of this treatment and partly explain how it affects abnormal detrusor contractions more markedly than voluntary bladder emptying
Experimental Analysis, Monitoring and Control of Landfill Gas Emissions Through IR Thermography
No full textEffect of botulinum neurotoxin on the urinary bladder: novel insights on mechanism of action.
No full textBotulinum neurotoxins (BoNTs) recently tarted to be used in common urologic practice for the treatment of neurogenic and non neurogenic detrusor overactivity (DO) refractory to all conventional treatments. The rationale was that botulinum toxin, particularly BoNT type A (BoNT/A), was able to block the presynaptic release of acetylcholine (ACh) from the parasympathetic efferent nerves thus paralyzing the detrusor smooth muscle, an action similar to that performed in skeletal muscles. With the present review we aimed at assessing the state of the art on the mechanisms of function of botulinum toxins in the management of urological dysfunctions. We searched PubMed using the medical subject heading (MeSH) term botulinum toxin in conjunction with any of the following terms: mechanism of action, bladder, afferent and efferent nervous transmission, urothelium and suburothelium, detrusor overactivity. Review articles and published abstracts were identified by limiting for review and abstract, respectively. The reference list of review and original papers were reviewed to identify any missed papers. A similar search strategy was applied in EMBASE using identical EMTREE terms. Recent evidences in in vivo and in in vitro studies suggest that in addition to a direct effect on detrusor motor innervation, BoNT/A also modulates intrinsic bladder reflexes through a multimodal effect on sensory pathways. Such mechanisms may contribute to the efficiency of this treatment and partly explain how it affects abnormal detrusor contractions more markedly than voluntary bladder emptying
Implementation of a System for the Analysis and Evaluation of Advantages of Distributed Generation
No full textThis paper presents a research activity at the Industrial Engineering Department of the University of Perugia, Italy, aimed at the development of a software tool (Co.Gis®) based on the use of interactive vectorial maps which allows to help the design and selection of a distributed generation system. The software is aimed at helping the user in the selection of the main characteristics of distributed generation systems by means of a methodology that calculates the avoided losses on the electrical grid and many other economical and technical indicators. The software can also be used to quantify the environmental benefits, to help in the feasibility studies of distributed generation systems and to manage the data and to control groups of small generation systems (Virtual Power Plant). The geo-referenced database of the present co-generation systems has been constructed on the Italian territory, with 1606 installations and approximately 12.000 MWe installed electric power. A complete database, which also includes all the other non-cogenerative distributed generation systems installed on the territory of Umbria, a small region in center of Italy, was prepared. This database is a powerful tool to characterize immediately the type of users that use cogeneration plants, to know the requirements of the market and to characterize and propose innovative energy conversion systems. Another characteristic is the possibility to perform feasibility studies of cogeneration systems. This instrument allows a significant simplification of the technical-economic evaluation procedures for the installation of an industrial or civil cogeneration system. The feasibility study can be combined with the calculation of electrical losses on the electricity transmission grid. The calculation of the avoided electrical losses, in terms of avoided CO2, offers a valid instrument to evaluate the environmental impact of different electrical generation systems and shows the advantages offered by distributed generation in the traditional generation park in Italy
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
- …
