1,221 research outputs found
Cyclostratigraphy of Cretaceous shallow-water carbonates. Case histories from central southern Italy
No full textCyclostratigraphy of Cretaceous shallow-water carbonates. Case histories from central southern Italy
No full textCretaceous carbonate strata and paleoclimatic oscillations. High versus low-frequency stratigraphic organization
No full textCyclostratigraphy of a carbonate platform as a tool of high-precision correlation
No full textMesozoic Carbonate Platforms of Southern Italy are thick (>3000 m) and well-stratified bodies, uplifted by the Late Tertiary–Quaternary deformation of the Northern Gondwanian Continental Margin. They formed mostly in the shallow ramp, open to restricted lagoon and peritidal/supratidal settings, and show a prevailingly cyclic organization, consisting of m-scale shallowing upward units. We think that this cyclicity is demonstrably controlled by the Earth’s orbital perturbations (individual cycle duration, hierarchical organization, numerical analysis of their sedimentological and petrophysical features). The genetic mechanisms of the cyclicity have a climatic dictator (allocyclicity), that is coupled with eustatic oscillations evidenced by features related to subaerial exposure, ranging from microkarst to more mature karst and paleosoils. Exposure features are widespread at the top of the cycles, even when these units are formed by only subtidal deposits, suggesting eustatic control.
This paper presents a study of three sections of the Aptian in the Campania region of Southern Italy. Here, a total of about 250 m has been studied at a cm scale. Sections include Serra Sbregavitelli (Central Matese Mountains, about160 m, Upper Aptian–Lower Albian); Monte Faito (Sorrento Peninsula, about 55 m, Upper Aptian–Lower Albian); and Monte Tobenna (Picentini Mountains, about 35 m, Upper Aptian), the latter two outcropping about 100 km SSE of the former. The three sections have a hierarchical organization composed of elementary cycles in turn grouped in bundles and superbundles, that have been related respectively to the Earth’s short and long orbital eccentricity oscillation, while the elementary cycles mostly appear to correspond to the precession or to a combination of precession and obliquity periodicities. In these successions, the stratal pattern shows a dominant aggradational configuration. The thickness of the cycles and their groups appears environmentally controlled, the thicker cycles being those formed in more open marine settings and vice versa. If analysed in terms of sequence stratigraphy, we may recognize in the superbundles a transgressive and a highstand system tract that, together with maximum flooding surfaces and sequence boundaries, was used to develop chronostratigraphic diagrams and to identify cycle omissions at the bundle and superbundle level. The number and amplitude of omissions in the successions appear proportional to the environmental conditions: the more restricted the water circulation in their original depositional sites, the more prone they were to cycle omissions. The sections of Monte Tobenna and Monte Faito were punctuated by omissions (one of them at the superbundle level ), while in Serra Sbregavitelli, we recognize a smaller number of gaps, not reaching the superbundle level. Lower-frequency oscillations (800–2000 k.y.) are also evident and suggest a long-term eustatic oscillation of the same periodicity during the lower Cretaceous
Remnants and Revenants: politics and violence in the work of Agamben and Derrida
No full textThis is the peer reviewed version of the following article: Frazer, Elizabeth, and Kimberly Hutchings. "Remnants and revenants: politics and violence in the work of Agamben and Derrida." The British Journal of Politics & International Relations 13.2 (2011): 127-144, which has been published in final form at http://dx.doi.org/10.1111/j.1467-856X.2010.00428.x. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.Jacques Derrida and Giorgio Agamben both consider the question of whether there can be politics without violence, offering contrasting responses. In the case of Agamben, the remnant (that which remains) is disruptive and destabilising of present institutions; in the case of Derrida the revenant, the spectre, promises a future that is open. This reading of the two theories suggests that Derrida's response to the question of politics and violence is more persuasive than Agamben's. But the abstraction of his argument, like the tensions and contradictions in Agamben's, means that we are not hereby furnished with the resources to think politically about violence
Brisures du romaneque: 'La Malédiction de la Madone', ou d'une pratique ironique du docufiction.
No full textLa Malédiction de la Madone, pubblicato nel 2022, è il primo romanzo in cui Philippe Vilain, scrittore tra i maggiori rappresentanti dell’autofinzione, ab- bandona la narrazione in prima persona per un “docufiction” in terza persona basato sulla vita della camorrista Pupetta Maresca. questo cambio di rotta, an- cor più sorprendente per un autore come Vilain che aveva sempre vilipeso que- sto genere letterario, è occasione di mettere in questione le sue concezioni del romanzo e della letteratura. Ne vien fuori una narrazione tesa tra l’aspirazione a far corpo unico con la sua precedente produzione letteraria e le condizioni im- poste dalla “docufinzionalizzazione” della storia. La Malédiction de la Madone diventa così un vero e proprio laboratorio letterario dove la sperimentazione più fine e pensosa svela inattese punte d’ironia.La Malédiction de la Madone, published in 2022, is the first novel in which Philippe Vilain, a writer among the greatest representatives of autofiction, abandons the first-person narration for a third-person “docufiction” based on the life of the camorrist Pupetta Maresca. This change of course, even more surprising for an author like Vilain who had always vilified this literary genre, is an opportunity to question his conceptions of the novel and of literature. The result is a narrative tended between the aspiration to merge with his previous literary pro- duction and the conditions imposed by “docufictionalization” of the history. The Malédiction de la Madone thus becomes a real literary laboratory where the finest and most thoughtful experimentation reveals unexpected hints of irony
FP-INJECTIVE SEMIRINGS, SEMIGROUP RINGS AND LEAVITT PATH ALGEBRAS
No full textIn this paper we give characterisations of FP-injective semirings (previously termed “exact” semirings in work of the first author). We provide a basic connection between FP-injective semirings and P-injective semirings, and establish that FP-injectivity of semirings is a Morita invariant property. We show that the analogue of the Faith-Menal conjecture (relating FP-injectivity and self-injectivity for rings satisfying certain chain conditions) does not hold for semirings. We prove that the semigroup ring of a locally finite inverse monoid over an FP-injective ring is FP-injective and give a criterion for the Leavitt path algebra of a finite graph to be FP-injective
Alive-FP: Automated Verification of Floating Point Based Peephole Optimizations in LLVM
No full textPeephole optimizations optimize and canonicalize code to enable other optimizations but are error-prone. Our prior research on Alive, a domain-specific language for specifying LLVM’s peephole optimizations, automatically verifies the correctness of integer-based peephole optimizations and generates C++ code for use within LLVM. This paper proposes Alive-FP, an automated verification and code generation framework for floating point based peephole optimizations in LLVM. Alive-FP handles bit precise floating point optimizations and a class of fast-math optimizations involving signed zeros, not-a-number, and infinities. This paper provides multiple encodings for various floating point operations to account for the various kinds of undefined behavior and under-specification in the LLVM’s language reference manual. We have translated all optimizations that belong to this category into Alive-FP. In this process, we have discovered seven wrong optimizations in LLVM.Technical report DCS-TR-72
Long-term orbital period behaviour of low mass ratio contact binaries GR Vir and FP Boo
No full text32nd International Physics Congress of Turkish-Physical-Society (TPS) -- SEP 06-09, 2016 -- Bodrum, TURKEYIn this study, we investigated orbital period variations of two low mass ratio contact binaries GR Vir and FP Boo based on published minima times. From the O-C analysis, it was found that FP Boo indicates orbital period decrease while the period of GR Vir is increasing. Mass transfer process was used to explain increase and decrease in the orbital periods. In the O-C diagrams of both systems periodic variations also exist. Cyclic changes can be explained as being the result of a light-travel time effect via a third component around the eclipsing binaries. In order to interpret of cyclic orbital period changes for GR Vir, which has late-type components, possible magnetic activity cycles of the components have been also considered.Turkish Phys So
[[alternative]]An Efficient Approach for Maintaining Association Rules based on Adjusting FP-tree Structure
No full text[[abstract]]In this thesis, the issue of mining and maintaining association rules in a large database of customer transactions is studied. The maintenance of association rules can be mapped into the problem of maintaining frequent itemsets in the database. Because the mining of association rules is time-consuming, we need an efficient approach to maintain the frequent itemsets when the database is updated. In this study, a general incremental updating technique is proposed for maintaining the frequent itemsets discovered in a database in the cases including insertion, deletion, and modification of transactions in the database. An efficient algorithm, called AFPIM (Adjusting FP-tree for Incremental Mining), is designed based on adjusting FP-tree structures. Our approach uses a FP-tree structure to store the compact information of transactions involving frequent and pre-frequent items in the original database. In most cases, the new FP-tree structure of the updated database can be obtained by adjusting FP-tree of the original database according to the changed transactions without needing to rescan the original database. Experimental results show that AFPIM outperforms the existing algorithms in terms of the execution time.
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