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Search Results: 1 - 10 of 223794 matches for " R. Ghetti "
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Fishery biology of the goldfish Carassius auratus (Linnaeus, 1758) in Lake Trasimeno (Umbria, Italy) Biologie halieutique du carassin Carassius auratus (Linnaeus, 1758) dans le lac Trasimeno (Ombrie, Italie)
Lorenzoni M.,Dolciami R.,Ghetti L.,Pedicillo G.
Knowledge and Management of Aquatic Ecosystems , 2010, DOI: 10.1051/kmae/20010001
Abstract: The fishery biology of the goldfish Carassius auratus was studied in Lake Trasimeno by analysing the selectivity of the equipment that can be used to control this invasive species. Sampling was conducted monthly from February 2003 to January 2004 by means of electrofishing, fyke-nets and gill-nets of different-sized mesh (22, 25, 28, 35, 40, 50, 70 and 80 mm). The average value of the CPUEs of goldfish caught was 10175.48 g·10 2·m 2 for gill-nets, 246.97 g·h 1 for fyke-nets and 606.50 g·min 1 for electrofishing. The efficiency of electrofishing was not uniform in all periods of the year, the mean CPUEs being highest in spring, when specimens of reproductive age were preferentially caught. Gill-nets yielded abundant catches of goldfish in all seasons, and displayed good sampling efficiency even in winter. With regard to the selectivity of gill-nets, estimated optimum selection lengths for each mesh size were: 11.92 cm, 13.55 cm, 15.18 cm, 18.97 cm, 21.68 cm, 27.10 cm, 37.94 cm and 43.36 cm. The results of this research demonstrate that the various fishing techniques can be effectively combined with the aim of controlling the goldfish population in Lake Trasimeno. La biologie halieutique du carassin Carassius auratus a été étudiée dans le lac Trasimeno par analyse de sélectivité des équipements utilisables pour contr ler cette espèce invasive. L’échantillonnage a été conduit mensuellement de février 2003 à janvier 2004 par pêche électrique, verveux et filets maillants de différentes tailles de maille (22, 25, 28, 35, 40, 50, 70 and 80 mm). La valeur moyenne des CPUE de carassin était de 10175,48 g·10 2·m 2 pour les filets maillants, de 246,97 g·h 1 pour les verveux et de 606,50 g·min 1 pour la pêche électrique. L’efficacité de la pêche électrique n’est pas uniforme suivant les périodes de l’année, les CPUE moyennes sont plus fortes au printemps, quand les individus en age de se reproduire sont principalement pêchés. Les captures de carassin par filet maillant sont abondantes en toute saison et montrent même une bonne efficacité en hiver. Compte tenu de la sélectivité des filets, les longueurs modales sélectionnées par chaque taille de maille sont : 11,92 cm, 13,55 cm, 15,18 cm, 18,97 cm, 21,68 cm, 27,10 cm, 37,94 cm et 43,36 cm. Les résultats de ces recherches montrent que les différentes techniques de pêche peuvent être efficaces en étant combinées pour contr ler la population de carassins du lac Trasimeno.
Correlations and Characterization of Emitting Sources
G. Verde,A. Chbihi,R. Ghetti,J. Helgesson
Physics , 2006, DOI: 10.1140/epja/i2006-10109-6
Abstract: Dynamical and thermal characterizations of excited nuclear systems produced during the collisions between two heavy ions at intermediate incident energies are presented by means of a review of experimental and theoretical work performed in the last two decades. Intensity interferometry, applied to both charged particles (light particles and intermediate mass fragments) and to uncharged radiation (gamma rays and neutrons) has provided relevant information about the space-time properties of nuclear reactions. The volume, lifetime, density and relative chronology of particle emission from decaying nuclear sources has been extensively explored and has provided valuable information about the dynamics of heavy-ion collisions. Similar correlation techniques applied to coincidences between light particles and complex fragments are also presented as a tool to determine the internal excitation energy of excited primary fragments as it appears in secondary-decay phenomena.
Influenza della giurisprudenza di diritto pubblico nella valutazione delle imprese
G. Ghetti
Aestimum , 1983,
Abstract:
The Role of Phase Space in Complex Fragment Emission from Low to Intermediate Energies
L. G. Moretto,R. Ghetti,K. X. Jing,L. Phair,K. Tso,G. J. Wozniak
Physics , 1996,
Abstract: The experimental emission probabilities of complex fragments by low energy compound nuclei and their dependence upon energy and atomic number are compared to the transition state rates. Intermediate-mass-fragment multiplicity distributions for a variety of reactions at intermediate energies are shown to be binomial and thus reducible at all measured transverse energies. From these distributions a single binary event probability can be extracted which has a thermal dependence. A strong thermal signature is also found in the charge distributions. The n-fold charge distributions are reducible to the 1-fold charge distributions through a simple scaling dictated by fold number and charge conservation.
Analysis of charged particle emission sources and coalescence in E/A = 61 MeV $^{36}$Ar + $^{27}$Al, $^{112}$Sn and $^{124}$Sn collisions
V. Avdeichikov,R. Ghetti,J. Helgesson,B. Jakobsson,P. Golubev,N. Colonna,H. W. Wilschut
Physics , 2004, DOI: 10.1016/j.nuclphysa.2004.02.023
Abstract: Single-particle kinetic energy spectra and two-particle small angle correlations of protons ($p$), deuterons ($d$) and tritons ($t$) have been measured simultaneously in 61A MeV $^{36}$Ar + $^{27}$Al, $^{112}$Sn and $^{124}$Sn collisions. Characteristics of the emission sources have been derived from a ``source identification plot'' ($\beta_{source}$--$E_{CM}$ plot), constructed from the single-particle invariant spectra, and compared to the complementary results from two-particle correlation functions. Furthermore, the source identification plot has been used to determine the conditions when the coalescence mechanism can be applied for composite particles. In our data, this is the case only for the Ar + Al reaction, where $p$, $d$ and $t$ are found to originate from a common source of emission (from the overlap region between target and projectile). In this case, the coalescence model parameter, $\tilde{p}_0$ -- the radius of the complex particle emission source in momentum space, has been analyzed.
The complement: a solution to liquid drop finite size effects in phase transitions
L. G. Moretto,K. A. Bugaev,J. B. Elliott,R. Ghetti,J. Helgesson,L. Phair
Physics , 2004, DOI: 10.1103/PhysRevLett.94.202701
Abstract: The effects of the finite size of a liquid drop undergoing a phase transition are described in terms of the complement, the largest (but still mesoscopic) drop representing the liquid in equilibrium with the vapor. Vapor cluster concentrations, pressure and density from fixed mean density lattice gas (Ising) model calculations are explained in terms of the complement. Accounting for this finite size effect is key to determining the infinite nuclear matter phase diagram from experimental data.
Messianismos em conflito: interpreta??o teológico-política de os sert?es
Ghetti, Pablo Sanges;
Lua Nova: Revista de Cultura e Política , 2010, DOI: 10.1590/S0102-64452010000200006
Abstract: the essay investigates the theological-political grounds of euclides da cunha's seminal work, os sert?es, with special emphasis put on the relation between messianism and potential construction of the nation. this paper does not simply apply the "theological-political" model to the reading of the work, in order to prove once more the structural equivalence between theological and political concepts. more than that, it analyses the conflicts of the period on the basis of theological-political exigencies. it thus understands opportunities and consequences of its ruins (in the double sense of caused destruction and of the ruin of the theological-political structure itself). with regard to the complex brazilian messianic tradition, this essay contributes to a new critical perception of the os sert?es role.
Les couleurs de Rome et de Florence The colours of Rome and Florence
Mario Augusto Lolli Ghetti
Bulletin du Centre de recherche du chateau de Versailles , 2007, DOI: 10.4000/crcv.74
Abstract: La couleur est un sujet d’actualité en Italie, en raison des intérêts économiques liés à la réutilisation, précédée de la restauration, des batiments des centres historiques, et aux phénomènes de dégradation des matériaux de construction des fa ades. Certaines interventions sur des monuments célèbres ont fait l’objet d'une importante couverture médiatique et ont déclenché un phénomène en cha ne dont les conséquences sont très surprenantes. La couleur chaude de Rome et celle, bien plus froide, de Florence sont modifiées de manière très sensible. à Rome, on assiste à un éclaircissement général de la couleur vers les tons du travertin ou de la couleur de l’air, au détriment des rouges et des jaunes ocres habituels. à Florence, on commence à voir des couleurs vives sur les fa ades des batiments, caractéristiques du xixe siècle ou bien des verts et des azurs plus typiques du xviie siècle, qui viennent de remplacer la bichromie traditionnelle du blanc de l'enduit et du gris de la pierre serena. Le r le de l'architecte chargé de la conservation de ces monuments est le contr le et la juste orientation de ces changements du go t. Colour is an ongoing concern in Italy due to the economic benefits that can be obtained from the restoration and re-use of buildings at historical sites, and because of the deterioration of the construction materials used in facades. Some of the work carried out on famous monuments has received considerable media attention and triggered a chain reaction, the consequences of which are very surprising. The warm colours of Rome and the colder tones of Florence have been modified to a considerable degree. In Rome, colours have been generally lightened towards that of travertine, or that of the air, to the detriment of the usual reds and yellow ochres. In Florence, bright colours are appearing on facades, either those characteristic of the nineteenth century or else greens and blues more typical of the seventeenth century, which have replaced the traditional bicoloured effect of white mortar and grey serena stone. The role of the architect entrusted with the conservation of these monuments is to ensure the correct application of these changes in taste.
Light cluster production in E/A = 61 MeV 36Ar + 112,124Sn reactions
R. Ghetti,J. Helgesson,V. Avdeichikov,B. Jakobsson,N. Colonna,G. Tagliente,H. W. Wilschut,V. L. Kravchuk
Physics , 2005,
Abstract: Experimental kinetic energy distributions and small-angle two-particle correlation functions involving deuterons and tritons are compared for 36Ar+ 112,124Sn collisions at E/A = 61 MeV (i.e. for systems similar in size, but with different isospin content). A larger triton yield is observed from the more neutron-rich system, as predicted by IBUU simulations, while the emission times of the light clusters are found to be the same for the two Sn-target systems. For both systems, the time sequence tau_{d} < tau_{p} < tau_{t}, is deduced for charged particles emitted from the intermediate velocity source.
Bank Vole Prion Protein As an Apparently Universal Substrate for RT-QuIC-Based Detection and Discrimination of Prion Strains
Christina D. Orrú?,Bradley R. Groveman?,Lynne D. Raymond?,Andrew G. Hughson?,Romolo Nonno?,Wenquan Zou?,Bernardino Ghetti,Pierluigi Gambetti?,Byron Caughey
PLOS Pathogens , 2015, DOI: 10.1371/journal.ppat.1004983
Abstract: Prions propagate as multiple strains in a wide variety of mammalian species. The detection of all such strains by a single ultrasensitive assay such as Real Time Quaking-induced Conversion (RT-QuIC) would facilitate prion disease diagnosis, surveillance and research. Previous studies have shown that bank voles, and transgenic mice expressing bank vole prion protein, are susceptible to most, if not all, types of prions. Here we show that bacterially expressed recombinant bank vole prion protein (residues 23-230) is an effective substrate for the sensitive RT-QuIC detection of all of the different prion types that we have tested so far – a total of 28 from humans, cattle, sheep, cervids and rodents, including several that have previously been undetectable by RT-QuIC or Protein Misfolding Cyclic Amplification. Furthermore, comparison of the relative abilities of different prions to seed positive RT-QuIC reactions with bank vole and not other recombinant prion proteins allowed discrimination of prion strains such as classical and atypical L-type bovine spongiform encephalopathy, classical and atypical Nor98 scrapie in sheep, and sporadic and variant Creutzfeldt-Jakob disease in humans. Comparison of protease-resistant RT-QuIC conversion products also aided strain discrimination and suggested the existence of several distinct classes of prion templates among the many strains tested.
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