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Search Results: 1 - 10 of 1742 matches for " Dario Bovio "
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Planning against forest fires: prevention more than extinction
Bovio G
Forest@ , 2006,
A new text-book on the management of forest ecosystems
Bovio G
Forest@ , 2011, DOI: 10.3832/efor0668-008
Abstract: A review is provided of a recently published text-book which describes, with emphasis on Italian forest ecosystems, ecologically-based approaches and methods for forest management and planning across different spatial scales.
The Abdominal Circulatory Pump
Andrea Aliverti, Dario Bovio, Irene Fullin, Raffaele L. Dellacà, Antonella Lo Mauro, Antonio Pedotti, Peter T. Macklem
PLOS ONE , 2009, DOI: 10.1371/journal.pone.0005550
Abstract: Blood in the splanchnic vasculature can be transferred to the extremities. We quantified such blood shifts in normal subjects by measuring trunk volume by optoelectronic plethysmography, simultaneously with changes in body volume by whole body plethysmography during contractions of the diaphragm and abdominal muscles. Trunk volume changes with blood shifts, but body volume does not so that the blood volume shifted between trunk and extremities (Vbs) is the difference between changes in trunk and body volume. This is so because both trunk and body volume change identically with breathing and gas expansion or compression. During tidal breathing Vbs was 50–75 ml with an ejection fraction of 4–6% and an output of 750–1500 ml/min. Step increases in abdominal pressure resulted in rapid emptying presumably from the liver with a time constant of 0.61±0.1SE sec. followed by slower flow from non-hepatic viscera. The filling time constant was 0.57±0.09SE sec. Splanchnic emptying shifted up to 650 ml blood. With emptying, the increased hepatic vein flow increases the blood pressure at its entry into the inferior vena cava (IVC) and abolishes the pressure gradient producing flow between the femoral vein and the IVC inducing blood pooling in the legs. The findings are important for exercise because the larger the Vbs the greater the perfusion of locomotor muscles. During asystolic cardiac arrest we calculate that appropriate timing of abdominal compression could produce an output of 6 L/min. so that the abdominal circulatory pump might act as an auxiliary heart.
Bad surprise while looking at the reform of “laurea magistrale” in Forestry and Environmental Sciences in the Italian University
Bovio G,Minotta G
Forest@ , 2006,
Abstract: The authors report the great surprise on the recent reform of "laurea magistrale" in Forestry and Environmental Sciences in the Italian University, that does not take into account at all some fundamental disciplines like silviculture and forest management.
Tree encroachment dynamics in heathlands of north-west Italy: the fire regime hypothesis
Ascoli D,Bovio G
iForest : Biogeosciences and Forestry , 2010, DOI: 10.3832/ifor0548-003
Abstract: Tree encroachment is one of the primary conservation issues in Calluna-heathlands, a priority habitat in Europe. Improving understanding of the ecological factors that trigger transitions to woodlands is key to developing strategies for heathlands management. The irrational use of fire has been recognized as one of the key factors that drives the loss of heathlands of north-west Italy. The effect of high frequency pastoral burning on the replacement of heathlands by grasslands has been documented by several studies. The relationship between fire and tree encroachment is less clear. The paper examines the effect of the fire regime on the encroachment of Populus tremula L. and Betula pendula Roth. in the heathland. The study was carried out at the Managed Nature Reserve of Vauda (7° 41’ E, 45° 13’ N), which includes one of the most valuable heathlands of north-western Italy. The experimental design consisted of analysing the age structure, dendrometric variables and the species composition of three aspen and birch stands, circular-shaped and isolated within the heathland matrix. From 1986 to 2009 all stands experienced the same fire regime due to pastoral burning. Wildfires of similar behaviour occurred in 1998, 2003 and 2008 and determined the stand structure observed in 2009. The results evidenced that fire acts as a catalyst not only for seedlings establishment, as previously documented, but also for woodland expansion in the heathland. After initial establishment, stands showed a concentric encroachment dynamic, mainly due to aspen root suckering after post-fire stem mortality, whose steps of expansion coincided with the return interval of wildfires. Moreover, aspen determined the loss of heathland characteristic species, whose relative abundances were inversely correlated to aspen density along a gradient from the stands centre to the surrounding heathland. The regulation of current burning practices by prescribed burning, integrated with rational grazing, presents the next research questions to be addressed.
Prescribed burning in Italy: issues, advances and challenges
Ascoli D,Bovio G
iForest : Biogeosciences and Forestry , 2013, DOI: 10.3832/ifor0803-006
Abstract: Prescribed burning has been carried out since the late 1970s in several southern European countries. Italy hosted some pioneer experiences in the early ’80s, but these did not follow up into practical implementation, and few studies and applications were carried out in subsequent years. In the last decade, a new interest arose and several experiences were carried out. We aim to illustrate the limitations, advances and challenges of prescribed burning in Italy by reviewing the national literature of the last 40 years on this subject. Unfavorable land characteristics, conflicting management goals, a hostile socio-cultural environment, and an inadequate regulatory framework have supposedly limited the application of prescribed burning in Italy. Nevertheless, in the last 20 years the legislation at the regional level has been updated to consider the use of fire, and new procedures to authorize prescribed fires allowed for experiments and application, even within National Parks. From 2005 to 2012, prescribed burning programs for fire hazard reduction, forest and range management, biodiversity conservation and firefighter training were implemented throughout Italy. Several vegetation and fuel types were involved (e.g., broadleaved and coniferous forests, Mediterranean and continental shrubland, grassland, slash). Studies on fire behavior and effects helped to set prescriptions for specific objectives and environments. Results were transferred to professionals through training sessions. Some of the challenges ahead are improving the legislative framework, e.g., by introducing a certification for the use of fire, and addressing issues of pastoral fire through conflict resolution programs. Prescribed burning in Italy could be developed by committing to carry out ecological studies on its implications to silviculture, range management and habitat conservation.
"ProgettoBosco": a decision-support system as educational tool at the University level
Bianchi M,Bovio G,Camia A,Cantiani P
Forest@ , 2006,
Abstract: The Decision Support System called "ProgettoBosco", build up for preparing sustainable forest management plans, has been tested as an educational tool at the university level in Italy. This software was succesfully tested with the collaboration of 120 students from the Forestry Faculties of Turin and Tuscia (Viterbo). We show here that using this software students were able to organize effectively data, that have been used to compile, in a rather short time (one week), two forest managent plans, having an extension of 250 and 100 ha.
Educating towards Musical Historical Heritage: What Difficulties?  [PDF]
Elita Maule, Dario De Cicco
Creative Education (CE) , 2012, DOI: 10.4236/ce.2012.326163
Abstract: How does one set about helping children and teenagers to understand the different musical styles and genres, the historical context pertaining to works of music and composers, or the historical aesthetic appreciation of the musical repertoire? Are these aims achievable and simple to attain with students? This article intends to focus on this very aspect, deemed important and included in all the national curricula throughout Europe. It will show that the teacher’s familiarity with the specialist musical code could lead him/her to take for granted technical knowledge that the student does not actually possess and that the problems of temporal conceptualization should represent an object of careful reflection for all teachers.
Approaches to Low Fuel Regression Rate in Hybrid Rocket Engines
Dario Pastrone
International Journal of Aerospace Engineering , 2012, DOI: 10.1155/2012/649753
Abstract: Hybrid rocket engines are promising propulsion systems which present appealing features such as safety, low cost, and environmental friendliness. On the other hand, certain issues hamper the development hoped for. The present paper discusses approaches addressing improvements to one of the most important among these issues: low fuel regression rate. To highlight the consequence of such an issue and to better understand the concepts proposed, fundamentals are summarized. Two approaches are presented (multiport grain and high mixture ratio) which aim at reducing negative effects without enhancing regression rate. Furthermore, fuel material changes and nonconventional geometries of grain and/or injector are presented as methods to increase fuel regression rate. Although most of these approaches are still at the laboratory or concept scale, many of them are promising. 1. Introduction Hybrid rocket engines (HREs) are chemical rockets which present interesting advantages over liquid rocket engines (LREs) and solid rocket motors (SRMs) and can provide a safe and affordable option for many applications. They have recently come to the fore as they have been chosen to power the second stage of the Tier One, the winner of the $10 million X-Prize [1]. The Tier One (http://www.scaled.com/projects/tierone/) was the first privately-developed reusable vehicle able to perform a manned suborbital flight over 100?km. The first stage of the Tier One is a twin-turbojet carrier-launch aircraft, called the White Knight, which is able to bring the second stage to 15?km altitude. The second stage, the SpaceShipOne, is a reusable three-place manned space plane, powered by an N2O/HTPB hybrid rocket engine. This HRE has a burning time of about 80 seconds and it is able to produce an average thrust of 75?kN with a vacuum specific impulse of about 250?s. The Tier One was retired after winning the X-Prize, but it remains proof that HREs may be the key propulsion system of the emerging space market [2]. In HREs, oxidizer and fuel are separated and stored in two different physical phases. In the most common configuration, a liquid or gaseous oxidizer and a solid-fuel grain are employed (direct HRE). In the conventional configuration the grain is cylindrical with a circular port. Due to this propellant storage, HREs have a peculiar combustion process as shown Figure 1. A boundary layer is formed when the oxidizer is injected into the port of the fuel grain. After ignition a diffusion flame is formed inside this layer. The fuel deriving from the solid grain is gasified by the heat coming
Dario Damjani?
Rudarsko-Geolo?ko-Naftni Zbornik , 2009,
Abstract: Drill stem testing of the exploration well consisted of two flow and two pressure build-up periods. Gas was obtained. Modified isochronal test was used during testing the well after completion. Except gas, small quantity of condensate and traces of oil and water were obtained. Both pressure build-up analyses showed that formation permeability is low. DST pressure build-up analysis showed that wellbore damage is present. This was proved later, when acid treatment was performed, by which skin was removed and production increased significantly. Data obtained by well testing are very important for future productivity prediction and determination of optimal well completion and surface facility construction.
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