Filters








748 Hits in 1.2 sec

Graded Poisson Algebras [article]

Alberto S. Cattaneo, Domenico Fiorenza, Riccardo Longoni
2018 arXiv   pre-print
This note is an expanded and updated version of our entry with the same title for the 2006 Encyclopedia of Mathematical Physics. We give a brief overview of graded Poisson algebras, their main properties and their main applications, in the contexts of super differentiable and of derived algebraic geometry.
arXiv:1811.07395v1 fatcat:qgckjphsbfedzohrnuj4mmgnzm

PaRA-Sched: A Reconfiguration-Aware Scheduler for Reconfigurable Architectures

Riccardo Cattaneo, Riccardo Bellini, Gianluca Durelli, Christian Pilato, Marco D. Santambrogio, Donatella Sciuto
2014 2014 IEEE International Parallel & Distributed Processing Symposium Workshops  
Harnessing the full capabilities offered by reconfigurable hardware is still a demanding task: the lack of proper methodologies and the intrinsic time consuming and error prone tailoring of these systems around the specific application places a barrier to the adoption of this technology. Partial and Dynamic Reconfiguration (PDR), in this context, is a specific feature whose potential is undiscussed but yet to uncover. In this work, we propose PaRA-Sched, an improvement for a state of the art,
more » ... state of the art, highly automated design methodology that allows the designer to rapidly explore the impact of PDR employment during the early stages of the design process. Specifically, we extend the scheduling infrastructure of the framework to explicitly take into account PDR to better explore the design space and improve overall performance by automatically masking reconfiguration time when possible. We show how this additional degree of freedom leads to designs whose performance are improved with respect to the baseline, with a limited increase in time spent during DSE.
doi:10.1109/ipdpsw.2014.32 dblp:conf/ipps/CattaneoBDPSS14 fatcat:uwn4oooj3falnix2dz7k5qu2ce

Asteroids eating sponges from Tethys Bay, East Antarctica

Carlo Cerrano, Giorgio Bavestrello, Barbara Calcinai, Riccardo Cattaneo-Vietti, Antonio Sarà
2000 Antarctic Science  
Introduction In many Antarctic benthic communities, sponges can be considered as keystone species on both hard and soft bottoms, affecting community structure and sediment texture (Cattaneo-Vietti et  ... 
doi:10.1017/s095410200000050x fatcat:edfo7doeojhn5atw6tzjtulxwm

Dosimetric accuracy of tomotherapy dose calculation in thorax lesions

Veronica Ardu, Sara Broggi, Giovanni Cattaneo, Paola Mangili, Riccardo Calandrino
2011 Radiation Oncology  
To analyse limits and capabilities in dose calculation of collapsed-cone-convolution (CCC) algorithm implemented in helical tomotherapy (HT) treatment planning system for thorax lesions. Methods: The agreement between measured and calculated dose was verified both in homogeneous (Cheese Phantom) and in a custom-made inhomogeneous phantom. The inhomogeneous phantom was employed to mimic a patient's thorax region with lung density encountered in extreme cases and acrylic inserts of various
more » ... s of various dimensions and positions inside the lung cavity. For both phantoms, different lung treatment plans (single or multiple metastases and targets in the mediastinum) using HT technique were simulated and verified. Point and planar dose measurements, both with radiographic extended-dose-range (EDR2) and radiochromic external-beamtherapy (EBT2) films, were performed. Absolute point dose measurements, dose profile comparisons and quantitative analysis of gamma function distributions were analyzed. Results: An excellent agreement between measured and calculated dose distributions was found in homogeneous media, both for point and planar dose measurements. Absolute dose deviations <3% were found for all considered measurement points, both inside the PTV and in critical structures. Very good results were also found for planar dose distribution comparisons, where at least 96% of all points satisfied the gamma acceptance criteria (3%-3 mm), both for EDR2 and for EBT2 films. Acceptable results were also reported for the inhomogeneous phantom. Similar point dose deviations were found with slightly worse agreement for the planar dose distribution comparison: 96% of all points passed the gamma analysis test with acceptable levels of 4%-4 mm and 5%-4 mm, for EDR2 and EBT2 films respectively. Lower accuracy was observed in high dose/low density regions, where CCC seems to overestimate the measured dose around 4-5%. Conclusions: Very acceptable accuracy was found for complex lung treatment plans calculated with CCC algorithm implemented in the tomotherapy TPS even in the heterogeneous phantom with very low lung-density.
doi:10.1186/1748-717x-6-14 pmid:21306629 pmcid:PMC3045960 fatcat:uvapwtolqndxngiyvlehywacme

On the Hochschild-Kostant-Rosenberg map for graded manifolds [article]

Alberto S. Cattaneo, Domenico Fiorenza, Riccardo Longoni
2005 arXiv   pre-print
We show that the Hochschild-Kostant-Rosenberg map from the space of multivector fields on a graded manifold N (endowed with a Berezinian volume) to the cohomology of the algebra of multidifferential operators on N (as a subalgebra of the Hochschild complex of the algebra of smooth functions on N) is an isomorphism of Batalin-Vilkovisky algebras. These results generalize to differential graded manifolds.
arXiv:math/0503380v1 fatcat:d7nxqoaezncg5bm5vlexrk3fja

Antarctic scallop (Adamussium colbecki) annual growth rate at Terra Nova Bay

Mariachiara Chiantore, Riccardo Cattaneo-Vietti, Olaf Heilmayer
2003 Polar Biology  
Cattaneo-Vietti Olaf Heilmayer M.  ...  Fig. 2 2 Ratio between shell length and height for specimens kept in aquaria, measured at the beginning (unfilled circles) and at the end (filled circles) of the experiment Maria chiara Chiantore AE Riccardo  ... 
doi:10.1007/s00300-003-0491-2 fatcat:iuvbuoffcvfkrdxctoeq6uzh4u

Conversing with a devil's advocate: Interpersonal coordination in deception and disagreement

Nicholas D. Duran, Riccardo Fusaroli, Luigi Cattaneo
2017 PLoS ONE  
Editor: Luigi Cattaneo, Universita degli Studi di Verona, ITALY  ... 
doi:10.1371/journal.pone.0178140 pmid:28574996 pmcid:PMC5456047 fatcat:kdqgv6atsvgxznvz4vfmvihcve

Swimming in the Antarctic scallop Adamussium colbecki: analysis of in situ video recordings

Alan D. Ansell, Riccardo Cattaneo-Vietti, Mariachiara Chiantore
1998 Antarctic Science  
Consequently, predation could be selectively more relevant on just detached medium-sized individuals (Cattaneo-Vietti et al. 1997) .  ...  Adamussium colbecki is long-lived and slow-growing with only intermittent recruitment (Ralph & Maxwell 1978 , Stockton 1984 , Berkman 1990 , Cattaneo-Vietti et al. 1997 , but because of its very high  ... 
doi:10.1017/s0954102098000455 fatcat:cmqpjtocnzfb3b663qsihmakoe

Synthesis of Ribavirin, Tecadenoson, and Cladribine by Enzymatic Transglycosylation

Marco Rabuffetti, Teodora Bavaro, Riccardo Semproli, Giulia Cattaneo, Michela Massone, Carlo F. Morelli, Giovanna Speranza, Daniela Ubiali
2019 Catalysts  
Despite the impressive progress in nucleoside chemistry to date, the synthesis of nucleoside analogues is still a challenge. Chemoenzymatic synthesis has been proven to overcome most of the constraints of conventional nucleoside chemistry. A purine nucleoside phosphorylase from Aeromonas hydrophila (AhPNP) has been used herein to catalyze the synthesis of Ribavirin, Tecadenoson, and Cladribine, by a "one-pot, one-enzyme" transglycosylation, which is the transfer of the carbohydrate moiety from
more » ... ydrate moiety from a nucleoside donor to a heterocyclic base. As the sugar donor, 7-methylguanosine iodide and its 2′-deoxy counterpart were synthesized and incubated either with the "purine-like" base or the modified purine of the three selected APIs. Good conversions (49–67%) were achieved in all cases under screening conditions. Following this synthetic scheme, 7-methylguanine arabinoside iodide was also prepared with the purpose to synthesize the antiviral Vidarabine by a novel approach. However, in this case, neither the phosphorolysis of the sugar donor, nor the transglycosylation reaction were observed. This study was enlarged to two other ribonucleosides structurally related to Ribavirin and Tecadenoson, namely, Acadesine, or AICAR, and 2-chloro-N6-cyclopentyladenosine, or CCPA. Only the formation of CCPA was observed (52%). This study paves the way for the development of a new synthesis of the target APIs at a preparative scale. Furthermore, the screening herein reported contributes to the collection of new data about the specific substrate requirements of AhPNP.
doi:10.3390/catal9040355 fatcat:mkiv6yo3wndi5orextfewqnp3m

Damage by fishing activities to the Gorgonian coralParamuricea clavata in the Ligurian Sea

GIORGIO BAVESTRELLO, CARLO CERRANO, DANIELE ZANZI, RICCARDO CATTANEO-VIETTI
1997 Aquatic conservation  
, DANIELE ZANZF and RICCARDO CATTANEO-VIETTI! 'Istituto di Zoologia dell’Universita di Genova, Via Balbi 5, Genova, I-16126, Italy ?Acquario di Genova, Porto Antico, Genova I-16126, Italy ABSTRACT 1.  ...  N., Cattaneo-Vietti, R. ef a/. 1994. ‘Primi lineamenti di bionomia bentica dell’Isola Gallinaria (Mar Ligure)’, Albertelli, G., Cattaneo-Vietti, R. and Picazzo, M.  ... 
doi:10.1002/(sici)1099-0755(199709)7:3<253::aid-aqc243>3.0.co;2-1 fatcat:lqy3repmn5eirgqvd27jsp2egu

Exchange between populations of Adamussium colbecki (Mollusca: Bivalvia) in the Ross Sea

Marta Guidetti, Stefania Marcato, Mariachiara Chiantore, Tomaso Patarnello, Giancarlo Albertelli, Riccardo Cattaneo-Vietti
2006 Antarctic Science  
This could be due to the high longevity of this species, as well as a growth rate reduced with age (Berkman et al. 1990 , Cattaneo-Vietti et al. 1997 .  ...  , with high interindividual variability: it is higher for smaller individuals (< 40 mm in shell length), showing an average growth rate of 10 mm yr -1 , compared to 0.8 mm yr -1 for large specimens (Cattaneo-Vietti  ... 
doi:10.1017/s0954102006000678 fatcat:tx75kcgn6zcofahrxs6h6aphpq

Yield and catch changes in a Mediterranean small tuna trap: a warming change effect?

Riccardo Cattaneo-Vietti, Valentina Cappanera, Michela Castellano, Paolo Povero
2014 Marine Ecology  
Information about the Tonnarella of Camogli originates from the 17th century (Cattaneo-Vietti & Bava 2009 ).  ...  Among other large pelagic predators, sharks are common catches and were frequently observed until the 1980s (Cattaneo-Vietti & Bava 2009).  ... 
doi:10.1111/maec.12127 fatcat:lgvg6sxaxzhxxk5vozzileypfy

The autonomic operating system research project

Davide B. Bartolini, Riccardo Cattaneo, Gianluca C. Durelli, Martina Maggio, Marco D. Santambrogio, Filippo Sironi
2013 Proceedings of the 50th Annual Design Automation Conference on - DAC '13  
Traditionally, hypervisors, operating systems, and runtime systems have been providing an abstraction layer over the bare-metal hardware. Traditional abstractions, however, do not consider for nonfunctional requirements such as system-level constraints or users' objectives. As these requirements are gaining increasing importance, researchers are looking into making user-specified and systemlevel objectives first-class citizens in the computer systems' realm. This paper describes the Autonomic
more » ... bes the Autonomic Operating System (AcOS) project; AcOS enhances commodity operating systems with an autonomic layer that enables self-* properties through adaptive resource allocation. With AcOS, we investigate intelligent resource allocation to achieve user-specified service-level objectives on application performance and to respect system-level thresholds on CPU temperature. We give a broad overview of AcOS, elaborate on its achievements, and discuss research perspectives.
doi:10.1145/2463209.2488828 dblp:conf/dac/BartoliniCDMSS13 fatcat:epd2ggix5vaqjkrsemyb2l3k2m

Temperature effects on summer growth rates in the Antarctic scallop, Adamussium colbecki

Olaf Heilmayer, Cornelia Honnen, Ute Jacob, Mariachiara Chiantore, Riccardo Cattaneo-Vietti, Thomas Brey
2005 Polar Biology  
Our study investigates whether this general pattern may be true for the Antarctic scallop, Adamussium colbecki (Smith 1902), a key species in Antarctic shallow-water communities (Cattaneo-Vietti et al  ... 
doi:10.1007/s00300-005-0716-7 fatcat:zhbiihbxgfhlve7bq24a26dvou

Adaptive Raytracing Implementation Using Partial Dynamic Reconfiguration

Gianluca Durelli, Fabrizio Spada, Riccardo Cattaneo, Christian Pilato, Danilo Pau, Marco D. Santambrogio
2014 2014 IEEE International Parallel & Distributed Processing Symposium Workshops  
The continuous strive for improvements in visual realism is progressively increasing the complexity of algorithms for simulating light physics to produce very realistic scenes. As a result, they are becoming more and more suitable for hardware acceleration, even if they introduce new challenges due to the high requirements in terms of resources. In this paper we propose a hardware implementation of the raytracing algorithm, which is a method for rendering 3D scenes. We exploit partial dynamic
more » ... t partial dynamic reconfiguration to adapt the hardware to the specific part of the image under analysis. This allows us to obtain up to 30% better performance with respect to the software baseline implementation on the AVNET ZedBoard platform.
doi:10.1109/ipdpsw.2014.31 dblp:conf/ipps/DurelliSCPPS14 fatcat:2mp22qiczndxjda2fndlepf53q
« Previous Showing results 1 — 15 out of 748 results