136 research outputs found
Lectures on Brill-Noether theory
No full textThese notes are the summary of lectures given by the author, in the framework of Joint Lectures of F. Flamini and E. Sernesi, at the Workshop
”Curves and Jacobians”, organized by the Korean Institute of Advanced Study (Seoul) and held on October 18-21, 2010, at Sol Beach Resort, Yangyang (Korea
Francesco Flamini dantista
No full textQuesto lavoro di tesi analizza il lavoro critico di Francesco Flamini come critico dantesco e il contributo dei suoi studi all’esegesi del poema. Si presenta una breve biografia dell’autore, l’analisi della sua opera principale di critica dantesca in due volumi I significati reconditi della Commedia di Dante e il suo fine supremo e, infine, lo studio della fortuna critica delle sue interpretazioni e l’analisi diretta di alcuni passi del poema, in particolare Inf., I 30. È qui inclusa un’appendice con alcune missive inedite di Flamini di argomento dantesco e una bibliografia completa delle opere del critico.
This thesis analyses Francesco Flamini's work as a Dante critic and the contribution of his studies to the exegesis of the poem. It presents a brief biography of the author, an analysis of his main work of Dantean criticism in two volumes I significati reconditi della Commedia di Dante e il suo fine supremo, and then a study of the critical fortunes of his interpretations and a direct analysis of some passages of the poem, in particular Inf. I 30. There is also an appendix containing some of Flamini's unpublished letters on Dante and a complete bibliography of the critic's works
Equivalence of families of singular schemes on threefolds and fourfolds
No full textThe main purpose of this paper is twofold. We first
analyze in detail the meaningful geometric aspect of the method
introduced in previous papers of the author, concerning
families of irreducible, nodal "curves" on a smooth, projective threefold X.
This analysis gives some geometric interpretations not investigated in the previous papers and
highlights several interesting connections with families of other singular geometric
"objects" related to X and to other varieties.
Then, we use this method to study analogous
problems for families of singular divisors on ruled fourfolds suitably
related to X. This enables us to show that Severi varieties of vector bundles
on X can be rephrased in terms of "classical" Severi varieties of divisors
on such fourfolds
Family leadership, family involvement and mutuality HRM practices in family SMEs
No full textIn the present study we argue that a more fine-grained perspective, taking into account different situations of family members' involvement and the actual implementation of HRM practices and policies, is needed to provide an accurate picture of family firms as employers. Our study is carried out on a unique sample of 849 family firms in Italy and focuses on the conditions and consequences of adopting mutuality-promoting HRM practices in the family business context
Strategic Effects and Incentives in Multi-issue Bargaining Games
No full textThe focus of the paper is on issue-by-issue bargaining procedures in which parties are allowed to differ not only in their valuations of the issues but also in their rates of time-preference. We show that the interplay of the forces in the bargaining game is complex and standard assumptions in the literature, such as a common discount factor, can be strong. We investigate the SPE of the game when the order of the issues can be changed and show that parties can have the same preferences over agendas when they both agree over the importance of an issue or when they disagree (if corner solutions are allowed and/or there is a difficult/urgent issue).
Dynamic Accumulation in Bargaining Games
No full textIn many bargaining situations the decisions that parties take at one point in time affect their future bargaining opportunities. We consider an ultimatum bargaining game in which parties can decide not only how to share a current surplus but also how much to invest in order to generate future surpluses. We show that there is a unique Markov perfect equilibrium (MPE) in which a proposer consumes the whole surplus not invested. Moreover, when the proposer has a sufficiently high discount factor, his MPE investment level is higher than his opponent’s, for a given capital stock. Finally, we show that bargaining can lead to overinvestment.
Long-run Negotiations withDynamic Accumulation
No full textTMany negotiations are characterised by dynamic accumulation: current agreements affect future bargaining possibilities. We study such situations by using repeated bargaining games in which two parties can decide how much to invest and how to share the residual surplus for their own consumption. We show that there is a unique (stationary) Markov Perfect Equilibrium characterised by immediate agreement. Moreover, in equilibrium a relatively more patient party invests more than his opponent. However, being more patient can make a player worse off. In addition, we derive the conditions under which we obtain an efficient investment path. Our results are robust to different bargaining procedures, different rates of time preference and elasticities of substitution.exports; control function; GMM; matching; TFP; sample selection
De gustibus non disputandum est: l'analisi sensoriale nella selezione di oli essenziali contro la zanzara tigre asiatica Aedes albopictus (Diptera Culicidae)
No full textI repellenti sono il principale strumento di prevenzione delle malattie trasmesse dalle zanzare che rappresentano una minaccia per milioni di persone in tutto il mondo. Gli oli essenziali sono promettenti alternative ai repellenti sintetici dato che hanno bassa tossicità nei confronti dei vertebrati e sono eco-compatibili. Tuttavia, benché gli studi che evidenziano le ottime proprietà anti-zanzara di molti oli essenziali siano numerosi, pochissime sono le indicazioni circa la loro accettabilità da parte dell’uomo quando usati come ingredienti di formulati repellenti ad uso topico o come spray ambientali. In questo lavoro abbiamo verificato la bioattività di alcuni oli essenziali nei confronti della zanzara tigre asiatica (Aedes albopictus (Skuse) Diptera Culicidae) e confrontato tale bioattività con la loro “gradevolezza” per il sistema sensoriale umano. A questo scopo, gli oli essenziali (OE) di Artemisia verlotiorum Lamotte (Asteraceae), Lavandula dentata L. (Lamiaceae) e Ruta chalepensis L. (Rutaceae) sono stati analizzati chimicamente mediante GC-MS e testati nei confronti di Ae. albopictus per determinare la loro attività repellente nei confronti degli adulti, la deterrenza all’ovideposizione e l’efficacia larvicida. Inoltre, alfine di selezionare l’OE non solo più efficace ma anche più gradevole come ingrediente nella formulazione di repellenti topici abbiamo eseguito uno screening olfattivo mediante un panel di esperti. Tutti gli EO testati hanno mostrato una significativa attività repellente contro femmine di Ae. albopictus, hanno inibito l'ovideposizione in prove di pieno campo e hanno esercitato una chiara attività larvicida. I risultati ottenuti dall’analisi sensoriale hanno indicato che il miglior profilo odoroso è stato quello associato all’EO di A. verlotiorum, mentre quello di R. chalepensis ha mostrato la più bassa piacevolezza. I test effettuati hanno indicato quindi l’EO di A. verlotiorum come il più gradito dal sistema sensoriale umano e il più sgradito a quello della zanzara tigre asiatica assicurando la completa protezione della pelle trattata contro le punture di Ae. albopictus per un tempo più lungo di circa il 60% rispetto al repellente sintetico DEET
Not just for beer: evaluation of spent hops (Humulus lupulus L.) as a source of ecofriendly repellents for insect pests of stored foods
No full textSpent hops is a waste produced in large amount by the brewing industry. Rhyzopertha dominica and
Sitophilus granarius are insects that cause important economic losses of stored foods. In this study, for the first time, spent hops has been evaluated as a source of essential oil (EO) and chemicals with repellent activity against R. dominica and S. granarius. Spent hops EO yield was 0.11 %. The terpenes myrcene, a-humulene, and b-caryophyllene were its main components (47 %). Spent hops EO RD50 values were 0.01 and 0.19 lL cm-2 for R. dominica and S. granarius, respectively. Among the chemicals, myrcene was able to exert the highest repellency against R. dominica (RD50 = 0.27 lM cm-2), while limonene was the most effective compound against S. granarius (RD50 = 0.89 lM cm-2). These results indicate spent hops as an excellent source of EO and chemicals to be utilized as low-cost, eco-friendly insect pests repellents
in the protection of stored food
The beer brewing waste spent hops (Humulus lupulus H.) as a valuable source of repellents useful to ward off insect attacks to stored food
No full textHop, Humulus lupulus L., is an aromatic plant largely utilized in the brewing industry to add flavour and bitterness to beer. As a consequence, a large amount of residual material, named “spent hops”, is produced by the brewing industry. Since only about 15% of the hop constituents end up in the beer, spent hops should be further valorised as a low-cost source of bioactive substances.
In this study, hops and spent hops were evaluated as a source of essential oil (EO) with repellent activity against two of the main stored food insect pests. Hops and spent hops EO yields were about 2.4% and 0.1%, respectively. The main components of both the EOs were the terpenes myrcene, α-humulene, and β-caryophyllene. The main chemical difference between hops and spent hops was the myrcene percentage. Area preference method bioassays showed that spent hops EO exerted a strong repellency against the lesser grain borer, Rhyzopertha dominica (F.) (Bostrichidae) and the granary weevil, Sitophilus granarius (L.) (Curculionidae). RD50 values indicated that R. dominica was about 20 time more susceptible to spent hops EO than S. granarius. Among the EO components, myrcene was the strongest repellent against R. dominica while limonene was the most effective compound against S. granarius. However, overall, for its much higher content, myrcene can be considered the compound that mostly contributes to the repellent activity of spent hops EO. These results show that spent hops could be an excellent, virtually costless, source of EO to be utilized as eco-friendly repellent in the protection of stored food from insect pests
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